阅读说明：本技术 挖掘机铲斗油缸防护机构 (Oil cylinder protection mechanism of excavator bucket ) 是由 许延坡 申欣 李均刚 朱梓明 李进 于 2021-07-07 设计创作，主要内容包括：本发明提供一种挖掘机铲斗油缸防护机构,包括斗杆、铲斗和铲斗油缸,铲斗位于斗杆的前方并与斗杆的前端铰接,铲斗油缸位于斗杆的上方,该挖掘机铲斗油缸防护机构还包括摇杆、后支撑架、连杆和防护装置,摇杆的底端与斗杆的前端铰接,铲斗上固定有前耳板,连杆的一端与前耳板铰接,连杆的另一端与摇杆的中部位置通过第一旋转轴铰接；铲斗油缸的前端与第一旋转轴铰接,铲斗油缸的后端与斗杆的后端铰接；摇杆的顶端与防护装置的前端通过第二旋转轴铰接,后支撑架固定于斗杆的后端,防护装置的后端与后支撑架通过第三旋转轴铰接；防护装置位于铲斗油缸的上方并与铲斗油缸间隔设置,防护装置为可伸缩的结构。(The invention provides an excavator bucket oil cylinder protection mechanism which comprises a bucket rod, a bucket and a bucket oil cylinder, wherein the bucket is positioned in front of the bucket rod and is hinged with the front end of the bucket rod; the front end of the bucket oil cylinder is hinged with the first rotating shaft, and the rear end of the bucket oil cylinder is hinged with the rear end of the bucket rod; the top end of the rocker is hinged with the front end of the protection device through a second rotating shaft, the rear support frame is fixed at the rear end of the bucket rod, and the rear end of the protection device is hinged with the rear support frame through a third rotating shaft; the protective device is positioned above the bucket oil cylinder and arranged at intervals with the bucket oil cylinder, and the protective device is of a telescopic structure.)

1. The excavator bucket oil cylinder protection mechanism comprises a bucket rod (1), a bucket (2) and a bucket oil cylinder (3), wherein the bucket (2) is located in front of the bucket rod (1) and hinged with the front end of the bucket rod (1), the bucket oil cylinder (3) is located above the bucket rod (1), the excavator bucket oil cylinder protection mechanism is characterized by further comprising a rocker (4), a rear support frame (5), a connecting rod (6) and a protection device (7), the bottom end of the rocker (4) is hinged with the front end of the bucket rod (1), a front lug plate (21) is fixed on the bucket (2), one end of the connecting rod (6) is hinged with the front lug plate (21), and the other end of the connecting rod (6) is hinged with the middle position of the rocker (4) through a first rotating shaft (81); the front end of the bucket oil cylinder (3) is hinged with the first rotating shaft (81), and the rear end of the bucket oil cylinder (3) is hinged with the rear end of the bucket rod (1); the top end of the rocker (4) is hinged with the front end of the protection device (7) through a second rotating shaft (82), the rear support frame (5) is fixed at the rear end of the bucket rod (1), and the rear end of the protection device (7) is hinged with the rear support frame (5) through a third rotating shaft (83); the protective device (7) is located above the bucket oil cylinder (3) and arranged at intervals with the bucket oil cylinder (3), and the protective device (7) is of a telescopic structure.

2. The excavator bucket cylinder guard mechanism according to claim 1, wherein the guard (7) comprises a slide rod (71) and a sleeve (72), the sleeve (72) is provided with a through hole (721) in the axial direction, the slide rod (71) is inserted into the through hole (721), the slide rod (71) is capable of sliding in the through hole (721) and extending or shortening the guard (7), one of the sleeve (72) and the slide rod (71) is hinged to the second rotating shaft (82), and the other of the sleeve (72) and the slide rod (71) is hinged to the third rotating shaft (83).

3. The excavator bucket cylinder guard mechanism of claim 2, wherein the sliding rod (71) is provided with a stop portion (711) at one end near the sleeve (72), the stop portion (711) extends and protrudes from the side wall of the sliding rod (71) in a radial direction, the sleeve (72) is provided with a flange (722) at one end near the sliding rod (71), the flange (722) extends and protrudes from the inner wall of the sleeve (72) in a radial direction, and the stop portion (711) is positioned in the through hole (721) and can abut against the flange (722).

4. The protection mechanism for the oil cylinder of the bucket of the excavator as claimed in claim 2, wherein said protection device (7) further comprises a front shaft sleeve (73) and a rear shaft sleeve (74), said front shaft sleeve (73) is fixed on the front end of said sliding rod (71), said front shaft sleeve (73) is sleeved on said second rotation shaft (82), said rear shaft sleeve (74) is fixed on the rear end of said sleeve (72), and said rear shaft sleeve (74) is sleeved on said third rotation shaft (83).

5. The excavator bucket cylinder guard mechanism of claim 4, wherein the number of the guards (7) is plural, the plural guards (7) are arranged in parallel at intervals, and shaft sleeves (76) are respectively arranged between the front shaft sleeve (73) of the guard (7) and the rocker (4), between the front shaft sleeves (73) of the two adjacent guards (7), between the rear shaft sleeve (74) of the guard (7) and the rear support frame (5), and between the rear shaft sleeves (74) of the two adjacent guards (7).

6. The excavator bucket cylinder guard mechanism as claimed in claim 1, wherein a rear lug plate (11) is fixed to a rear end of the arm (1), a rear end of the bucket cylinder (3) is hinged to the rear lug plate (11) through a fourth rotation shaft (84), and the rear support frame (5) is fixed to the rear lug plate (11).

7. The excavator bucket cylinder guard mechanism of claim 1, wherein the swing lever (4) comprises a first connecting block (41) and a second connecting block (42) connected to each other, the second connecting block (42) is located above the first connecting block (41), the bottom end of the first connecting block (41) is hinged to the front end of the arm (1), the top end of the first connecting block (41) and the bottom end of the second connecting block (42) are both connected to the first rotating shaft (81), and the top end of the second connecting block (42) is connected to the second rotating shaft (82).

8. The oil cylinder protection mechanism of the bucket of the excavator as claimed in claim 7, wherein the first connecting block (41) and the second connecting block (42) are connected through a fixing device (9), the fixing device (9) comprises a fixing block (91), a pressing plate (92), a cover plate (93) and a bolt (94), a protrusion (421) is arranged at the bottom end of the second connecting block (42), the fixing block (91) is welded and fixed on the side wall of the first connecting block (41), the fixing block (91) is provided with a clamping groove (911), the side wall of the second connecting block (42) is attached to the side wall of the first connecting block (41), the protrusion (421) is clamped in the clamping groove (911), the pressing plate (92) is provided with a protrusion (921), the pressing plate (92) is attached to the side wall of the second connecting block (42), and the protrusion (921) is clamped in the clamping groove (911), the cover plate (93) is attached to the protruding portion (921) and fixed to the fixing block (91) through the bolt (94).

9. The oil cylinder protection mechanism of the bucket of the excavator as claimed in claim 1, wherein the number of the rocking bars (4) is two, two rocking bars (4) are respectively arranged corresponding to both sides of the bucket rod (1), and the first rotating shaft (81) and the second rotating shaft (82) are simultaneously connected with the two rocking bars (4).

10. The oil cylinder protection mechanism of the bucket of the excavator as claimed in claim 1, wherein the number of the rear support frames (5) is two, two rear support frames (5) are respectively provided corresponding to both sides of the arm (1), and both ends of the third rotation shaft (83) are respectively connected to the two rear support frames (5).

Technical Field

The invention relates to the technical field of excavator structures, in particular to an excavator bucket cylinder protection mechanism.

Background

The oil cylinder plays a role as an actuator in a working device as a common component in an excavator, and is divided into a boom cylinder, a bucket bar cylinder, and a bucket cylinder. Under the mutual cooperation of the three types of oil cylinders, the excavator has strong excavating force, wherein the thrust provided by the bucket oil cylinder accounts for the largest proportion of the excavating force.

An excavator generally includes an arm and a bucket hinged to a front end of the arm, and a bucket cylinder is hinged to the bucket and the arm at both ends thereof, respectively, so as to rotate the bucket relative to the arm to perform an excavating work. Whether the bucket cylinder normally works or not is important, the excavator usually works under the open environment, the bucket cylinder is generally arranged above the bucket rod, the bucket cylinder can be damaged due to external force or impact of materials, a protection device is not arranged on the bucket cylinder of the existing earthwork excavator, and the quality of the bucket cylinder is also tested.

Among the prior art, some excavators have set up protector to the scraper bowl hydro-cylinder, like the excavator scraper bowl hydro-cylinder protection machanism that publication number CN108487364B discloses, it includes dipper, scraper bowl link mechanism, scraper bowl hydro-cylinder and hydro-cylinder protection machanism, hydro-cylinder protection machanism includes pendulum rod and the scraper bowl hydro-cylinder guard plate of two-bar structure, the pendulum rod lower extreme rotates with the dipper to be connected, the pendulum rod upper end rotates through the rear end of round pin axle with scraper bowl hydro-cylinder guard plate to be connected, scraper bowl hydro-cylinder guard plate be located the top of scraper bowl hydro-cylinder and the front end of scraper bowl hydro-cylinder guard plate with scraper bowl link mechanism's rear end rotates to be connected. The excavator bucket oil cylinder protection mechanism increases the complexity of mechanism movement on the basis of the original design, and then increases the operation difficulty; meanwhile, a supporting structure is arranged on the bucket rod, so that the risk that the bucket rod is damaged during operation is increased; and adopt welded mode to connect, after the collision damage, it is comparatively troublesome to change the part. Therefore, the protective device for the oil cylinder of the bucket of the excavator, which has a simple structure, is stable and reliable and does not influence the motion of the original mechanism, needs to be designed.

Disclosure of Invention

The invention aims to provide a protective mechanism for an oil cylinder of a bucket of an excavator, which aims to overcome the defects in the prior art, provides good protection for the oil cylinder of the bucket on the basis of not influencing the movement of the original mechanism, and has the advantages of simple structure, stability, reliability and lower cost.

The invention provides an excavator bucket oil cylinder protection mechanism which comprises a bucket rod, a bucket and a bucket oil cylinder, wherein the bucket is positioned in front of the bucket rod and is hinged with the front end of the bucket rod; the front end of the bucket oil cylinder is hinged with the first rotating shaft, and the rear end of the bucket oil cylinder is hinged with the rear end of the bucket rod; the top end of the rocker is hinged with the front end of the protection device through a second rotating shaft, the rear support frame is fixed at the rear end of the bucket rod, and the rear end of the protection device is hinged with the rear support frame through a third rotating shaft; the protective device is located above the bucket oil cylinder and arranged at intervals with the bucket oil cylinder, and the protective device is of a telescopic structure.

Further, the protection device comprises a sliding rod and a sleeve, wherein a through hole is formed in the sleeve in the axial direction, the sliding rod is inserted into the through hole and can slide in the through hole, the protection device is extended or shortened, one of the sliding rod and the sleeve is hinged to the second rotating shaft, and the other of the sliding rod and the sleeve is hinged to the third rotating shaft.

Furthermore, the sliding rod is provided with a stopping portion at one end close to the sleeve, the stopping portion extends and protrudes from the side wall of the sliding rod along the radial direction, the sleeve is provided with a flange at one end close to the sliding rod, the flange extends and protrudes from the inner wall of the sleeve along the radial direction, and the stopping portion is located in the through hole and can abut against the flange.

Furthermore, the protection device further comprises a front shaft sleeve and a rear shaft sleeve, wherein the front shaft sleeve is fixed at the front end of the sliding rod, the front shaft sleeve is sleeved on the second rotating shaft, the rear shaft sleeve is fixed at the rear end of the sleeve, and the rear shaft sleeve is sleeved on the third rotating shaft.

Furthermore, the number of the protection devices is multiple, the protection devices are arranged in parallel at intervals, and shaft sleeves are arranged between the front shaft sleeves of the protection devices and the rocker, between the front shaft sleeves of the two adjacent protection devices, between the rear shaft sleeve of the protection device and the rear support frame, and between the rear shaft sleeves of the two adjacent protection devices.

Further, the rear end of dipper is fixed with the back otic placode, the rear end of scraper bowl hydro-cylinder with the back otic placode is articulated through the fourth swivel axis, back support frame is fixed on the back otic placode.

Further, the rocker includes interconnect's first connecting block and second connecting block, the second connecting block is located the top of first connecting block, the bottom of first connecting block with the front end of dipper is articulated, the top of first connecting block with the bottom of second connecting block all with first rotation axis links to each other, the top of second connecting block with the second rotation axis links to each other.

Further, the first connecting block with the second connecting block passes through fixing device and links to each other, fixing device includes fixed block, clamp plate, apron and bolt, the bottom of second connecting block is equipped with the arch, the fixed block welded fastening is in on the lateral wall of first connecting block, the fixed block is equipped with the draw-in groove, the lateral wall of second connecting block with the lateral wall of first connecting block is laminated mutually just protruding card is in the draw-in groove, the clamp plate is equipped with the bellying, the clamp plate with the lateral wall of second connecting block is laminated mutually just the bellying card is in the draw-in groove, the apron with the bellying is laminated mutually and is passed through the bolt with the fixed block is fixed mutually.

Furthermore, the number of the rocking rods is two, the two rocking rods are respectively arranged corresponding to two sides of the bucket rod, and the first rotating shaft and the second rotating shaft are simultaneously connected with the two rocking rods.

Furthermore, the number of the rear support frames is two, the two rear support frames are respectively arranged corresponding to two sides of the bucket rod, and two ends of the third rotating shaft are respectively connected with the two rear support frames.

According to the excavator bucket oil cylinder protection mechanism provided by the invention, the protection device is positioned above the bucket oil cylinder and shields the whole bucket oil cylinder, so that a good protection effect can be provided for the bucket oil cylinder, the bucket oil cylinder is prevented from being damaged due to external force or material impact, meanwhile, the protection device is of a telescopic structure, when the bucket and the bucket rod rotate relatively, the protection device stretches together, the movement between the bucket and the bucket rod is not influenced, and redundant movement actions are not increased.

The invention only adds the rear supporting frame and the protective device on the basis of the original design, improves the structure of the rocker, and has less structural members increase and less overall weight increase compared with the prior art, thereby reducing the labor cost and the material cost. Meanwhile, the rocker is used as the middle connecting piece and is simultaneously hinged with the bucket rod, the connecting rod, the protective device and the bucket oil cylinder, the linkage among all the parts is good, the movement action is compact, stable and reliable, and meanwhile, the movement action of the original design is not changed. Therefore, the invention has the advantages of simple structure, stability, reliability, small weight increase and low cost.

Drawings

Fig. 1 is a schematic structural view of an excavator bucket cylinder guard mechanism according to a first embodiment of the present invention.

Fig. 2 is a schematic view of the connection of the rocker and the rear support frame to the bucket in fig. 1.

Fig. 3 is a schematic view of the guard of fig. 2 connected to the rocker and rear support frame.

Fig. 4 is a schematic diagram of the exploded structure of fig. 3.

Fig. 5 is a schematic cross-sectional view of the guard of fig. 3.

Fig. 6 is an enlarged schematic view of the structure at position a in fig. 5.

Fig. 7 is a schematic structural diagram of the rocker in fig. 1.

Fig. 8 is a schematic diagram of the exploded structure of fig. 7.

FIG. 9 is a schematic structural diagram of a rocker according to a second embodiment of the present invention.

FIG. 10 is a schematic structural diagram of a rocker according to a third embodiment of the present invention.

Fig. 11 is an exploded view of fig. 10.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms of orientation, up, down, left, right, front, back, top, bottom, and the like (if any) referred to in the specification and claims of the present invention are defined by the positions of structures in the drawings and the positions of the structures relative to each other, only for the sake of clarity and convenience in describing the technical solutions. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

As shown in fig. 1 to 3, the bucket cylinder guard mechanism of an excavator according to a first embodiment of the present invention includes an arm 1, a bucket 2, and a bucket cylinder 3, where the bucket 2 is located in front of the arm 1 and is hinged to a front end of the arm 1, and the bucket cylinder 3 is located above the arm 1. The excavator bucket cylinder protection mechanism further comprises a rocker 4, a rear support frame 5, a connecting rod 6 and a protection device 7. The bottom of rocker 4 is articulated with the front end of dipper 1, is fixed with preceding otic placode 21 on the scraper bowl 2, and the one end and the preceding otic placode 21 of connecting rod 6 are articulated, and the other end of connecting rod 6 is articulated through first rotation axis 81 with the middle part position of rocker 4. The front end of the bucket cylinder 3 is hinged to the first rotating shaft 81, and the rear end of the bucket cylinder 3 is hinged to the rear end of the arm 1. The top of rocker 4 is articulated through second rotation axis 82 with the front end of protector 7, and rear support frame 5 is fixed in the rear end of dipper 1, and the rear end of protector 7 is articulated through third rotation axis 83 with rear support frame 5. The protective device 7 is positioned above the bucket cylinder 3 and is arranged at an interval with the bucket cylinder 3, and the protective device 7 is of a telescopic structure.

Specifically, in the present embodiment, the minimum distance between the guard 7 and the bucket cylinder 3 is not less than 5mm to avoid interference or collision of the guard 7 with the bucket cylinder 3 during excavation by the excavator.

Further, as shown in fig. 1 and 2, in the present embodiment, a rear lug plate 11 is fixed to a rear end of the arm 1, a rear end of the bucket cylinder 3 is hinged to the rear lug plate 11 via a fourth rotation shaft 84, and the rear bracket 5 is fixed to the rear lug plate 11. The number of the rear lug plates 11 is two, the two rear lug plates 11 are respectively arranged corresponding to two sides of the bucket rod 1, and two ends of the fourth rotating shaft 84 are respectively connected with the two rear lug plates 11. In the present embodiment, the rear support frame 5 and the rear lug plate 11 are fixed to the rear end of the arm 1 by welding.

Further, as shown in fig. 1 and 2, in the present embodiment, the bottom end of the swing lever 4 is hinged to the front end of the arm 1 via a fifth rotating shaft 85, the front lug 21 is hinged to the front end of the arm 1 via a sixth rotating shaft 86, and the front lug 21 is hinged to the link 6 via a seventh rotating shaft 87.

Specifically, in fig. 1, the bucket 2 is in a state of rotating to the lowest end (i.e. the bucket 2 retracts inward to the maximum extent, and at this time, the bucket cylinder 3 extends to the maximum stroke), when the bucket cylinder 3 retracts inward (the stroke of the bucket cylinder is shortened), the bucket cylinder 3 drives the first rotating shaft 81 to move backward, at this time, the rocker 4 and the connecting rod 6 both move backward and rotate, and at the same time, the bucket 2 is driven to rotate outward, and at this time, the protection device 7 performs a retracting motion correspondingly; when the bucket cylinder 3 extends outwards (the stroke of the bucket cylinder is lengthened), the bucket cylinder 3 pushes the first rotating shaft 81 to move forwards, at the same time, the rocker 4 and the connecting rod 6 both move forwards and rotate reversely, and simultaneously, the bucket 2 is driven to rotate inwards, at the same time, the protective device 7 correspondingly extends, and finally, the state shown in fig. 1 is recovered. In the process, the movement of the guard 7 does not affect the movement of the other components at all times.

Further, in the present embodiment, the first rotation shaft 81, the second rotation shaft 82, the third rotation shaft 83, the fourth rotation shaft 84, the fifth rotation shaft 85, the sixth rotation shaft 86, and the seventh rotation shaft 87 are all pin shafts.

Further, as shown in fig. 3 to 5, in the present embodiment, the protection device 7 includes a sliding rod 71 and a sleeve 72, the sleeve 72 is provided with a through hole 721 along the axial direction, the sliding rod 71 is inserted into the through hole 721, and the sliding rod 71 can slide in the through hole 721 and extend or shorten the protection device 7. The sleeve 72 and one of the slide bars 71 are hinged with a second rotation shaft 82, and the sleeve 72 and the other of the slide bars 71 are hinged with a third rotation shaft 83.

Further, as shown in fig. 6, in the present embodiment, the sliding rod 71 is provided with a stopping portion 711 at an end close to the sleeve 72, the stopping portion 711 extends and protrudes from a sidewall of the sliding rod 71 in a radial direction, the sleeve 72 is provided with a flange 722 at an end close to the sliding rod 71, the flange 722 extends and protrudes from an inner wall of the sleeve 72 in a radial direction, and the stopping portion 711 is located in the through hole 721 and can abut against the flange 722.

Specifically, a stopper 711 is provided on the slide bar 71, and a flange 722 is provided on the sleeve 72, so as to prevent the sleeve 72 from being disengaged from the slide bar 71 when the sleeve 72 and the slide bar 71 slide relative to each other.

Further, as shown in fig. 3 and 4, in the present embodiment, the sliding rod 71 is hinged to the second rotating shaft 82, and the sleeve 72 is hinged to the third rotating shaft 83 (of course, in other embodiments, the sleeve 72 may be hinged to the second rotating shaft 82, and the sliding rod 71 may be hinged to the third rotating shaft 83). The protection device 7 further comprises a front shaft sleeve 73 and a rear shaft sleeve 74, wherein the front shaft sleeve 73 is fixed at the front end of the sliding rod 71, the front shaft sleeve 73 is sleeved on the second rotating shaft 82, the rear shaft sleeve 74 is fixed at the rear end of the sleeve 72, and the rear shaft sleeve 74 is sleeved on the third rotating shaft 83.

Specifically, in the present embodiment, the front bushing 73 is fixed to the slide bar 71 by welding, and the rear bushing 74 is fixed to the sleeve 72 by welding. When the protective device 7 is installed, the sliding rod 71 is firstly installed in the sleeve 72, and then the front shaft sleeve 73 and the rear shaft sleeve 74 are respectively welded and fixed on the sliding rod 71 and the sleeve 72.

Further, in the present embodiment, the sleeve 72 and the sliding rod 71 are both hollow cylindrical structures, and the sliding rod 71 and the sleeve 72 are both made of steel, so that not only has good strength, but also a light effect can be achieved, thereby avoiding an excessive increase in the weight of the working device, and simultaneously saving material cost.

Further, as shown in fig. 3 and 4, the number of the guards 7 is plural, and the plural guards 7 are arranged in parallel at intervals. Bushings 76 are provided between the front bushing 73 of the guard 7 and the rocker 4, between the front bushings 73 of two adjacent guards 7, between the rear bushing 74 of the guard 7 and the rear support frame 5 and between the rear bushings 74 of two adjacent guards 7. In this embodiment, the number of the protection devices 7 is three, the three protection devices 7 are arranged in parallel at intervals, the number of the protection devices 7 can be determined according to actual requirements, and the protection devices 7 can shield the whole bucket cylinder 3.

Specifically, the shaft sleeve 76 can play a positioning role, so that the plurality of protection devices 7 can be spaced, and the protection devices 7 can be prevented from swinging left and right, so that the protection devices 7 are prevented from being directly contacted and abraded due to long-time work.

Further, as shown in fig. 1, 7 and 8, in the present embodiment, the swing lever 4 includes a first connecting block 41 and a second connecting block 42 that are connected to each other, the second connecting block 42 is located above the first connecting block 41, a bottom end of the first connecting block 41 is hinged to a front end of the arm 1, a top end of the first connecting block 41 and a bottom end of the second connecting block 42 are both connected to the first rotating shaft 81, and a top end of the second connecting block 42 is connected to the second rotating shaft 82.

Specifically, the first connecting block 41 is a rocker of the existing design, so the rocker 4 of the embodiment only needs to add the second connecting block 42 on the basis of the existing design, and the structure is simple and the modification is convenient.

Further, as shown in fig. 1, 7 and 8, in the present embodiment, the first connecting block 41 and the second connecting block 42 are connected by the fixing device 9, and the fixing device 9 includes a fixing block 91, a pressing plate 92, a cover plate 93 and a bolt 94. The bottom of second connecting block 42 is equipped with protruding 421 (protruding 421 play fixed and guide effect), and fixed block 91 welded fastening is on the lateral wall of first connecting block 41, and fixed block 91 is equipped with draw-in groove 911. The lateral wall of second connecting block 42 and the lateral wall of first connecting block 41 laminate mutually and protruding 421 card is in draw-in groove 911, and clamp plate 92 is equipped with bellying 921, and clamp plate 92 and the lateral wall of second connecting block 42 laminate mutually and bellying 921 card is in draw-in groove 911, and apron 93 laminates mutually with bellying 921 and is fixed mutually with fixed block 91 through bolt 94. That is, the second connecting block 42 is pressed to the first connecting block 41 by the pressing plate 92, and then the pressing plate 92 and the second connecting block 42 are pressed and fixed by the cooperation of the cover plate 93 and the fixing block 91.

Specifically, as shown in fig. 1 and 2, in the present embodiment, the number of the rockers 4 is two, the two rockers 4 are respectively disposed corresponding to two sides of the arm 1, and the first rotating shaft 81 and the second rotating shaft 82 are both connected to the two rockers 4 at the same time. The first connecting block 41 and the second connecting block 42 of one rocker 4 (the rocker 4 shown in fig. 1 is located on the left side of the bucket rod 1) are connected through the fixing device 9 so as to be convenient for detaching and replacing parts, and the first connecting block 41 and the second connecting block 42 of the other rocker 4 (the rocker 4 shown in fig. 2 is located on the right side of the bucket rod 1) are directly connected through welding.

Specifically, as shown in fig. 1 and 2, in the present embodiment, the number of the rear support frames 5 is two, two rear support frames 5 are respectively disposed corresponding to both sides of the arm 1, and both ends of the third rotation shaft 83 are respectively connected to the two rear support frames 5. One of the rear support frames 5 (the rear support frame 5 shown in fig. 1, which is located on the left side of the arm 1) is fixed to the rear lug plate 11 through a fixing device 9 so as to facilitate the removal and replacement of parts, and the other rear support frame 5 (the rear support frame 5 shown in fig. 2, which is located on the right side of the arm 1) is directly welded and fixed to the rear lug plate 11.

In the second embodiment, as shown in fig. 9, the whole rocker 4 is an integral structure, so as to simplify the structure of the rocker 4 and facilitate the installation and manufacture.

As shown in fig. 10 and 11, in the third embodiment, each rocker 4 includes two metal blocks superimposed on each other (i.e., the rocker 4 in the second embodiment and the first connecting block 41 in the first embodiment are superimposed together), so as to reinforce the strength of the rocker 4.

The excavator bucket cylinder protection mechanism that this embodiment provided has:

1. in the embodiment, the protective device 7 is arranged, and the protective device 7 is positioned above the bucket cylinder 3 and shields the whole bucket cylinder 3, so that a good protective effect can be provided for the bucket cylinder 3, the bucket cylinder 3 is prevented from being damaged due to external force or impact of materials, and the service life of the bucket cylinder 3 is prolonged; meanwhile, the protective device 7 is of a telescopic structure, when the bucket 2 and the bucket rod 1 rotate relatively, the protective device 7 stretches together without influencing the movement between the bucket 2 and the bucket rod 1, and redundant movement actions are not increased.

2. This embodiment is through increasing back support frame 5 and protector 7 on original design basis to improve the structure of rocker 4, it is few to compare in prior art's excavator bucket hydro-cylinder protection mechanism's structure increase quantity, and whole weight increases lessly, can reduce cost of labor and material cost.

3. In the embodiment, the rocker 4 is used as an intermediate connecting piece, the rocker 4 is simultaneously hinged with the bucket rod 1, the connecting rod 6, the protective device 7 and the bucket oil cylinder 3, the linkage among all the parts is good, the movement action is compact, stable and reliable, and meanwhile, the movement action of the original design is not changed.

4. The structure of the protection device 7 in this embodiment is simple, stable and reliable, and the number of the protection devices 7 can be flexibly selected according to actual requirements. The sleeve 72 and the sliding rod 71 of the protection device 7 are both hollow cylindrical structures, and the sliding rod 71 and the sleeve 72 are both made of steel, so that the protection device has good strength, can achieve a light effect, avoids excessively increasing the weight of a working device, and can save material cost.

5. In this embodiment, the first connecting block 41 and the second connecting block 42 of the rocker 4 are connected by the fixing device 9, and the rear support frame 5 is also fixed on the rear ear plate 11 by the fixing device 9, so as to facilitate the detachment and replacement of parts.

The excavator bucket cylinder protection mechanism provided by the embodiment has the advantages of simple structure, stability, reliability, small weight increase and low cost.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.