Lifting arm of skid steer loader

Abstract

The invention relates to the technical field of loading, discloses a hoisting arm of a skid steer loader, and solves the problems that when an existing hoisting arm of the skid steer loader is used for shoveling high-density hard blocks, the shoveling cannot be carried out due to insufficient power, and the hard blocks are difficult to enter a bucket quickly. The large arm is rotationally connected to one side of the fixing frame, the first hydraulic oil cylinder is rotationally connected to one side of the large arm, the connecting frame is rotationally connected to the output end of the first hydraulic oil cylinder, and a pushing structure used for increasing driving force is arranged on one side of the fixing frame. The working capacity and efficiency of the loader facing stones of different sizes are greatly improved, the output end of the second hydraulic oil cylinder is fixedly connected with the bucket, so that the second hydraulic oil cylinder can conduct secondary stress application pushing on the bucket when needed, operation is convenient and efficient, it can be guaranteed that large stones smoothly enter the bucket, and the working efficiency is improved. The motor drives the cam to rotate, so that the bucket is in a vibration state, and the working efficiency of the bucket is improved.

Description

Technical Field

[0001] The invention relates to the technical field of loading, in particular to a lifting arm of a skid loader. Background Art

[0002] A skid steer loader is a small multifunctional engineering machinery that is widely used in the construction and agricultural fields. The lifting arm, as one of the important accessories of the skid steer loader, can realize the transportation of sand and stone.

[0003] The power system of existing loaders cannot provide sufficient scooping force when facing larger stones, making it difficult for the bucket to scoop up the stones, reducing work efficiency, delaying project progress and increasing construction costs. In the case of insufficient driving force, large stones are difficult to enter the bucket, resulting in low efficiency and difficult operation.

[0004] In view of the above problems, an innovative design is carried out on the basis of the original skid loader lifting arm. Summary of the invention

[0005] The purpose of the present invention is to provide a skid loader lifting arm, which is used to work, thereby solving the problem that the existing skid loader lifting arm cannot shovel hard blocks with large density due to insufficient power and is difficult to quickly enter the bucket.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a skid loader lifting arm, comprising a fixed frame, a large arm rotatably connected to one side of the fixed frame, a hydraulic cylinder 1 rotatably connected to one side of the large arm, a connecting frame rotatably connected to the output end of the hydraulic cylinder 1, and a bucket rotatably connected to one side of the connecting frame, a monitoring sensor is fixedly installed on one side of the bucket, a machine chassis is fixedly installed on one side of the fixed frame, a camera is fixedly installed on one side of the machine chassis, and a thrust structure for increasing the driving force is provided on one side of the fixed frame; The push structure includes a fixed plate arranged on one side of the fixed frame, a movable seat rotatably connected to one side of the fixed plate, and a hydraulic cylinder 2 arranged on a side of the movable seat away from the fixed plate; A fixed structure for connecting the bucket with the second output end of the hydraulic cylinder is provided on one side of the pushing structure, the fixed structure includes a rectangular shell provided on the second output end of the hydraulic cylinder, a groove provided inside the rectangular shell, a limit block elastically connected to the inside of the rectangular shell, two groups of limit blocks are symmetrically distributed about the rectangular shell, the two groups of limit blocks are trapezoidal, the fixed structure also includes a fixed block provided on the side of the bucket close to the connecting frame, a connecting seat rotatably connected to one side of the fixed block, a connecting column provided on one side of the connecting seat, a sleeve block slidably connected to the surface of the connecting column, a hemisphere provided on the end of the connecting column away from the connecting seat, the maximum diameter of the hemisphere is equal to that of the sleeve block, and the spacing between the two groups of limit blocks is less than the diameter of the hemisphere; Vibration structures for quickly feeding large stones into the bucket are arranged on both sides of the fixed block. The vibration structure includes motors arranged on both sides of the fixed block and cams arranged at the output ends of the motors. The cams are in contact with the bucket and push the bucket.

[0007] Furthermore, a notch is provided inside the rectangular shell, the notch is connected to the channel, two groups of notches are symmetrically provided, the two groups of notches correspond to the limit blocks, a spring is sleeved on the surface of the limit block, and one end of the spring is connected to the notch.

[0008] Furthermore, one side of the connecting seat is rotatably connected to a rotating seat, and the rotating seat is connected and fixed to the fixing block.

[0009] Furthermore, receiving grooves are provided on both sides of the fixing block, and sensors are fixedly installed inside the receiving grooves, and the sensors are electrically connected to the motor.

[0010] Furthermore, a cleaning structure for cleaning ground stones is provided at the bottom end of the machine chassis, and a hydraulic cylinder is provided at the bottom end of the machine chassis. The cleaning structure includes racks provided on both sides of the hydraulic cylinder housing, one side of the rack is meshed with a gear, one end of the gear is provided with a screw, the surface of the screw is threadedly connected with a moving block, and a scraper is provided at the bottom end of the moving block.

[0011] Furthermore, a compression shell is provided at the output end of the hydraulic cylinder, and shells are provided on both sides of the compression shell. Long grooves are opened on the surface of the shells, the rack is slidably connected to the long grooves, and the screw is rotationally connected to the shells.

[0012] Furthermore, an opening is provided at the bottom end of the shell, and the moving block moves in the opening. A connecting rod is provided at the top end of the rack, and a side plate is provided on one side of the connecting rod, and the side plate is fixedly connected to the hydraulic cylinder housing.

[0013] Furthermore, a lower fixed structure for fixing the fuselage to the ground is provided at the bottom end of the machine chassis, and the lower fixed structure includes a slide groove opened inside the compression shell, and two groups of slide grooves are symmetrically opened about the compression shell, and the inside of each of the two groups of slide grooves is slidably connected with a slider, and a movable plate is provided between the two groups of sliders, and a nail head is provided at the bottom end of the movable plate, and there are multiple groups of nail heads distributed at equal intervals.

[0014] Furthermore, the surface of the compression shell is symmetrically provided with notches, the interior of the notches is rotatably connected with a rotating rod, and springs are arranged at both ends of the rotating rod.

[0015] Furthermore, an inclined plate is provided on the surface of the rotating rod, one end of the inclined plate extends out of the recess, and the other end of the inclined plate is located at the upper end of the movable plate. A push plate is provided on one side of the rack, and the push plate is used to push the inclined plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention provides a lifting arm for a skid loader. The existing lifting arm for a skid loader cannot move when shoveling hard blocks with larger density due to insufficient power and is difficult to quickly enter the bucket. The invention comprises a fixed frame, a large arm rotatably connected to one side of the fixed frame, a hydraulic cylinder 1 rotatably connected to one side of the large arm, and a connecting frame rotatably connected to the output end of the hydraulic cylinder 1. A pushing structure for increasing the driving force is provided on one side of the fixed frame. The driving force of the hydraulic cylinder 2 is superimposed on the hydraulic cylinder 1, which greatly improves the working capacity and efficiency of the loader when facing stones of different sizes. The output end of the hydraulic cylinder 2 is connected and fixed to the bucket, so that the hydraulic cylinder 2 can perform secondary force pushing on the bucket when needed. The operation is convenient and efficient, and can ensure that large stones can enter the bucket smoothly. At the same time, the sensor can monitor the bucket situation and cooperate with the motor to drive the cam to rotate to put the bucket in a vibrating state. This can help the stones enter the bucket better when handling large stones, improve the working efficiency of the bucket, reduce the need for manual intervention, effectively improve the processing capacity of stones of different sizes, and enhance work efficiency and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the pushing structure, the fixing structure and the vibration structure of the present invention; Figure 3 It is a schematic diagram of a three-dimensional expanded cross-sectional structure of the fixing structure of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the vibration structure of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the lower fixing structure and the cleaning structure of the present invention; Figure 6 It is a three-dimensional cross-sectional structural schematic diagram of the lower fixing structure and the cleaning structure of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the lower fixed structure of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the cleaning structure of the present invention.

[0018] In the figure: 1, fixed frame; 2, big arm; 3, hydraulic cylinder 1; 4, connecting frame; 5, bucket; 6, push structure; 61, fixed plate; 62, movable seat; 63, hydraulic cylinder 2; 7, fixed structure; 71, rectangular shell; 72, groove; 73, notch; 74, spring; 75, limit block; 76, hemisphere; 77, connecting column; 78, sleeve block; 79, connecting seat; 710, rotating seat; 711, fixed block; 8, vibration structure; 81, storage slot; 82, sensor; 83, motor; 84, cam; 9 , cleaning structure; 92, side plate; 93, connecting rod; 94, rack; 95, shell; 96, long groove; 97, gear; 98, screw; 99, moving block; 910, scraper; 911, opening; 10, monitoring sensor; 11, camera; 12, lower fixed structure; 122, slide groove; 123, slider; 124, moving plate; 125, nail head; 126, notch; 127, rotating rod; 128, spring; 129, inclined plate; 1210, push plate; 13, machine chassis; 14, hydraulic cylinder; 15, compression shell. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0021] Combination Figure 1-Figure 4 A lifting arm of a skid loader includes a fixed frame 1, a boom 2 rotatably connected to one side of the fixed frame 1, a hydraulic cylinder 3 rotatably connected to one side of the boom 2, a connecting frame 4 rotatably connected to the output end of the hydraulic cylinder 3, and a bucket 5 rotatably connected to one side of the connecting frame 4, a monitoring sensor 10 is fixedly installed on one side of the bucket 5, a machine chassis 13 is fixedly installed on one side of the fixed frame 1, a camera 11 is fixedly installed on one side of the machine chassis 13, and a thrust structure 6 for increasing the driving force is provided on one side of the fixed frame 1.

[0022] The present invention will be further described below in conjunction with the embodiments.

[0023] See also Figure 1-8 The pushing structure 6 includes a fixed plate 61 arranged on one side of the fixed frame 1, a movable seat 62 rotatably connected to one side of the fixed plate 61, and a hydraulic cylinder 63 arranged on a side of the movable seat 62 away from the fixed plate 61, so as to conveniently and efficiently allow large stones to enter the bucket 5.

[0024] A fixed structure 7 for connecting the bucket 5 with the output end of the hydraulic cylinder 2 63 is provided on one side of the pushing structure 6. The fixed structure 7 includes a rectangular shell 71 provided at the output end of the hydraulic cylinder 2 63, a groove 72 provided inside the rectangular shell 71, and a limit block 75 elastically connected to the inside of the rectangular shell 71. The limit blocks 75 are symmetrically distributed in two groups about the rectangular shell 71. The two groups of limit blocks 75 are trapezoidal. The fixed structure 7 also includes a fixed block 711 provided on the side of the bucket 5 close to the connecting frame 4, a connecting seat 79 rotatably connected to one side of the fixed block 711, a connecting column 77 provided on one side of the connecting seat 79, and a sleeve block 78 slidably connected to the surface of the connecting column 77. , a hemisphere 76 is arranged at one end of the connecting column 77 away from the connecting seat 79, the maximum diameter of the hemisphere 76 is equal to that of the sleeve block 78, the spacing between the two groups of the limit blocks 75 is smaller than the diameter of the hemisphere 76, a notch 73 is provided inside the rectangular shell 71, the notch 73 is connected to the groove 72, two groups of notches 73 are symmetrically provided, the two groups of notches 73 correspond to the limit blocks 75, a spring 74 is sleeved on the surface of the limit block 75, one end of the spring 74 is connected to the notch 73, one side of the connecting seat 79 is rotatably connected to a rotating seat 710, and the rotating seat 710 is connected and fixed to the fixed block 711, which is convenient for fixing the hydraulic cylinder 2 63 and the bucket 5 when in use and separating them when not in use.

[0025] Vibration structures 8 for quickly feeding large stones into the bucket are arranged on both sides of the fixed block 711. The vibration structure 8 includes motors 83 arranged on both sides of the fixed block 711, and cams 84 arranged at the output ends of the motor 83. The cams 84 are in contact with the bucket 5, and the cams 84 push the bucket 5. Receiving grooves 81 are opened on both sides of the fixed block 711. Sensors 82 are fixedly installed inside the receiving grooves 81. The sensor 82 is electrically connected to the motor 83, thereby improving the working efficiency of the bucket 5.

[0026] The bottom of the chassis 13 is provided with a cleaning structure 9 for cleaning the ground stones, and a hydraulic cylinder 14 is provided at the bottom of the chassis 13. The cleaning structure 9 includes racks 94 provided on both sides of the outer shell of the hydraulic cylinder 14, one side of the rack 94 is meshed with a gear 97, one end of the gear 97 is provided with a screw 98, the surface of the screw 98 is threadedly connected with a moving block 99, and the bottom of the moving block 99 is provided with a scraper 910, and the output end of the hydraulic cylinder 14 is provided with a pressure shell 15, and the two sides of the pressure shell 15 are provided with a shell 95, a long groove 96 is provided on the surface of the shell 95, the rack 94 is slidably connected to the long groove 96, the screw 98 is rotatably connected to the shell 95, an opening 911 is provided at the bottom end of the shell 95, and the moving block 99 moves in the opening 911. A connecting rod 93 is provided at the top end of the rack 94, and a side plate 92 is provided on one side of the connecting rod 93. The side plate 92 is fixedly connected to the outer shell of the hydraulic cylinder 14, which effectively improves the stability of the lifting arm when the power is insufficient and reduces the risk of wheel slippage.

[0027] The bottom end of the chassis 13 is provided with a lower fixed structure 12 for fixing the fuselage to the ground. The lower fixed structure 12 includes a slide groove 122 opened inside the compression shell 15. Two groups of slide grooves 122 are symmetrically opened about the compression shell 15. The insides of the two groups of slide grooves 122 are each slidably connected with a slider 123. A moving plate 124 is provided between the two groups of sliders 123. The bottom end of the moving plate 124 is provided with a nail head 125. There are multiple groups of nail heads 125 distributed at equal intervals. The surface of the compression shell 15 is symmetrically provided with notches 126. The notches 126 are provided with a plurality of notches 126. The internal rotation of 26 is connected with a rotating rod 127, and springs 128 are arranged at both ends of the rotating rod 127. An inclined plate 129 is arranged on the surface of the rotating rod 127. One end of the inclined plate 129 extends out of the recess 126, and the other end of the inclined plate 129 is located at the upper end of the movable plate 124. A push plate 1210 is arranged on one side of the rack 94. The push plate 1210 is used to push the inclined plate 129 to ensure that the nail head 125 can be smoothly inserted into the soil, thereby further improving the adaptability and working reliability of the lifting arm under complex terrain.

[0028] Specifically, first, the staff drives the loader to move to the front end of the stone pile through the cab, and then drives the big arm 2 and the hydraulic cylinder 1 3 that are rotatably connected between the fixed frame 1 through the cab, and the hydraulic cylinder 1 3 drives the bucket 5 on the side of the connecting frame 4 that is rotatably connected to shovel toward the stone. When facing larger stones, the monitoring sensor 10 fixedly installed on one side of the bucket 5 monitors the situation of the bucket 5. The shoveling force provided by the hydraulic cylinder 1 3 is insufficient, which makes it difficult for the bucket 5 to shovel the stone, reducing the work efficiency, so the hydraulic cylinder 2 63 is driven by the cab to start, and the driving force of the hydraulic cylinder 2 63 is superimposed on the driving force of the hydraulic cylinder 1 3 to push the bucket 5. One end of the hydraulic cylinder 2 63 is fixed to the fixed frame 1 through the fixed plate 61 rotatably connected to the movable seat 62, which is convenient for adapting to the rotation of the boom. The fixed structure 7 at the output end of the hydraulic cylinder 2 63 drives the fixed block 711 fixedly installed on the bucket 5, so that large stones can be easily and efficiently put into the bucket 5, which greatly improves the working ability and efficiency of the lifting arm when facing stones of different sizes, and adapts to more complex working scenes. As the output end of the hydraulic cylinder 2 63 drives the rectangular shell 71 to move toward the connecting seat 79, the connecting seat 79 is connected to the fixed block 711 through the rotating seat 710 connected by rotation, and the fixed block 711 is fixedly installed with the bucket 5. Since the interior of the rectangular shell 71 is provided with a groove 72, the groove 72 corresponds to the hemisphere 76, and the diameter of the groove 72 is greater than the diameter of the hemisphere 76, and the diameter of the hemisphere 76 is equal to the maximum diameter of the sleeve block 78, as the hydraulic cylinder 2 63 drives the rectangular shell 71 to move, the hemisphere 76 enters the interior of the groove 72, and the arc surface of the hemisphere 76 contacts the inclined surfaces of the two sets of limit blocks 75, and the two sets of limit blocks 75 are in contact with each other. The spacing between them is smaller than the diameter of the hemisphere 76. The outer end of the limit block 75 is sleeved with a spring 74 and connected to the notch 73 opened on the surface of the rectangular shell 71. The notch 73 is connected to the groove 72. The arc surface of the hemisphere 76 squeezes the inclined surfaces of the two groups of limit blocks 75 to move into the notch 73, and the two groups of limit blocks 75 squeeze and store force on the spring 74. Further, the plane of the hemisphere 76 contacts the plane of the limit block 75, and the hemisphere 76 moves to the side of the two groups of limit blocks 75 away from the sleeve block 78, so that the hydraulic cylinder 2 63 is connected to the bucket 5 through the fixed structure 7, so that the hydraulic cylinder 2 63 can push the bucket 5 for a second time through the fixed structure 7. When the pneumatic force of hydraulic cylinder 1 3 is insufficient, hydraulic cylinder 2 63 uses two groups of driving force to push bucket 5, which makes it convenient and efficient to put large stones into the bucket. Hemisphere 76 is fixed to connecting seat 79 through connecting column 77, and sleeve block 78 is slidably connected to connecting column 77. With the continuous pushing of hydraulic cylinder 2 63, rectangular shell 71 contacts connecting seat 79. Sleeve block 78 is formed by two groups of truncated cones symmetrically spliced ​​together, so that the limit block 75 in rectangular shell 71 will be squeezed back into the inside of notch 73 by one group of truncated cone arc surfaces of sleeve block 78, and the tip of limit block 75 slides through the joint of the two groups of truncated cones and connects with the inclined surface of another group of truncated cones near connecting seat 79. When the hydraulic cylinder 63 is not needed, the piston rod of the hydraulic cylinder 63 can be retracted. The retraction of the piston rod drives the rectangular shell 71 to move away from the connecting seat 79, so that the two sets of limit blocks 75 drive the sleeve block 78 to slide on the connecting column 77 and contact the plane of the hemisphere 76, and then the outer edge of the hemisphere 76 is flush with the outer edge of the sleeve block 78, so that the inclined surface of the limit block 75 slides over the outer edge of the sleeve block 78 and the hemisphere 76, and the limit block 75 is further separated from the limit of the hemisphere 76, which is convenient for the next time the hydraulic cylinder 63 is fixed to the bucket 5 through the fixing structure 7; At the same time, the sensor 82 is embedded in the storage groove 81 opened at both ends of the fixed block 711. The situation of the bucket 5 is monitored by the sensor 82, and the motors 83 on both sides of the fixed block 711 are driven forward and reversely at the same time. The two sets of motors 83 respectively drive the cams 84 at the output ends to rotate, so that the rotation of the cams 84 will push the bucket 5, further making the bucket 5 vibrate, which is convenient for the bucket 5 to shovel large stones and quickly enter the bucket. This makes it convenient for the bucket 5 to shovel large stones and quickly enter the bucket 5, thereby improving the working efficiency of the bucket 5. Especially when handling large stones, vibration can help the stones enter the bucket 5 better, reducing the need for manual intervention; When the power is insufficient, the wheels will slip on the spot, causing the loader to lose stability and the problem of wheel wear. By starting the hydraulic cylinder 14 at the bottom of the fixed frame 1, the hydraulic cylinder 14 drives the pressure shell 15 at the output end to move downward, and the pressure shell 15 drives the shells 95 on both sides to move downward, so that the two sets of gears 97 rotatably connected inside the shells 95 on both sides are respectively engaged with the corresponding racks 94, and the racks 94 slide in the long grooves 96 opened on the surface of the shells 95. The racks 94 are fixedly connected to the side plates 92 through the connecting rods 93, and the side plates 92 are fixedly connected to the outer shell of the hydraulic cylinder 14. The gears 97 drive the screws 98 to rotate, and the screws 98 is threadedly connected with the moving block 99, and the moving block 99 slides in the opening 911 opened on the bottom surface of the shell 95. Since the scraper 910 contacts the ground first, the moving block 99 drives the scraper 910 at the bottom to push and clean the stones on the ground, so that the nail head 125 can better contact the ground and avoid being blocked by stones. The camera 11 installed on one side of the machine chassis 13 monitors the situation to ensure the accuracy and safety of the operation, effectively improve the stability of the hoisting arm when the power is insufficient, reduce the risk of wheel slippage, extend the service life of the wheel, and ensure the reliability of the hoisting arm under various working conditions; As the compression shell 15 descends, the inclined plates 129 rotatably connected on both sides of the compression shell 15 are pushed by the push plates 1210 between the two sets of racks 94, so that the two sets of inclined plates 129 are pushed upward, and the inclined plates 129 are rotated by the rotating rod 127, and the rotating rod 127 drives the springs 128 at both ends to twist and store force, and the rotating rod 127 is rotatably connected with the notches 126 opened at both ends of the compression shell 15, and one end of the inclined plate 129 inside the compression shell 15 is located at the upper end of the moving plate 124, so that the inclined plate 129 is rotated by the rotating rod 127 to press the moving plate 124 to slide downward, and the moving plate 124 is moved downward. The sliders 123 at both ends of the movable plate 124 slide in the slide grooves 122 symmetrically opened on the inner wall of the compression shell 15. The movable plate 124 drives multiple groups of nail heads 125 distributed at equal intervals at the bottom to move downward and insert into the ground. The height of the nail head 125 is greater than the height of the scraper 910, so that the nail head 125 is inserted into the soil. The scraper 910 is in contact with the ground, and can clear away obstacles such as stones on the ground before the nail head 125 is inserted into the soil, ensuring that the nail head 125 can be smoothly inserted into the soil, further improving the adaptability and working reliability of the lifting arm under complex terrain.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A skid loader lifting arm, comprising a fixed frame (1), a large arm (2) rotatably connected to one side of the fixed frame (1), a hydraulic cylinder (3) rotatably connected to one side of the large arm (2), a connecting frame (4) rotatably connected to an output end of the hydraulic cylinder (3), and a bucket (5) rotatably connected to one side of the connecting frame (4), characterized in that: A monitoring sensor (10) is fixedly mounted on one side of the bucket (5), a machine chassis (13) is fixedly mounted on one side of the fixing frame (1), a camera (11) is fixedly mounted on one side of the machine chassis (13), and a boosting structure (6) for increasing driving force is provided on one side of the fixing frame (1); The pushing structure (6) comprises a fixed plate (61) arranged on one side of the fixed frame (1), a movable seat (62) rotatably connected to one side of the fixed plate (61), and a second hydraulic cylinder (63) arranged on a side of the movable seat (62) away from the fixed plate (61); A fixed structure (7) for connecting the bucket (5) to the output end of the second hydraulic cylinder (63) is provided on one side of the pushing structure (6). The fixed structure (7) comprises a rectangular shell (71) provided at the output end of the second hydraulic cylinder (63), a groove (72) provided inside the rectangular shell (71), and a limit block (75) elastically connected to the inside of the rectangular shell (71). The limit blocks (75) are symmetrically distributed in two groups with respect to the rectangular shell (71). The two groups of limit blocks (75) are trapezoidal. The fixed structure (7) also comprises A fixed block (711) is arranged on a side of the bucket (5) close to the connecting frame (4), a connecting seat (79) rotatably connected to one side of the fixed block (711), a connecting column (77) is arranged on one side of the connecting seat (79), a sleeve block (78) is slidably connected to the surface of the connecting column (77), and a hemisphere (76) is arranged on an end of the connecting column (77) away from the connecting seat (79), the maximum diameters of the hemisphere (76) and the sleeve block (78) are equal, and the spacing between the two groups of the limit blocks (75) is smaller than the diameter of the hemisphere (76); Vibration structures (8) for quickly feeding large stones into the bucket are arranged on both sides of the fixed block (711), and the vibration structure (8) comprises motors (83) arranged on both sides of the fixed block (711), and cams (84) arranged at the output end of the motor (83), the cams (84) being in contact with the bucket (5), and the cams (84) pushing the bucket (5).

2. The skid steer loader lifting arm according to claim 1, characterized in that: A notch (73) is provided inside the rectangular shell (71), the notch (73) being connected to the channel (72), two groups of notches (73) being symmetrically provided, the two groups of notches (73) corresponding to the limit blocks (75), a spring (74) being sleeved on the surface of the limit blocks (75), one end of the spring (74) being connected to the notch (73).

3. The skid steer loader lifting arm according to claim 1, characterized in that: One side of the connecting seat (79) is rotatably connected to a rotating seat (710), and the rotating seat (710) is connected and fixed to a fixing block (711).

4. The skid steer loader lifting arm according to claim 1, characterized in that: The fixed block (711) is provided with receiving grooves (81) on both sides, and a sensor (82) is fixedly installed inside the receiving groove (81), and the sensor (82) is electrically connected to the motor (83).

5. The skid steer loader lifting arm according to claim 1, characterized in that: A cleaning structure (9) for cleaning ground stones is arranged at the bottom end of the machine chassis (13), and a hydraulic cylinder (14) is arranged at the bottom end of the machine chassis (13). The cleaning structure (9) comprises racks (94) arranged at both sides of the outer shell of the hydraulic cylinder (14), one side of the rack (94) is meshed with a gear (97), one end of the gear (97) is arranged with a screw (98), the surface of the screw (98) is threadedly connected with a moving block (99), and the bottom end of the moving block (99) is provided with a scraper (910).

6. The skid steer loader lifting arm according to claim 5, characterized in that: The output end of the hydraulic cylinder (14) is provided with a compression shell (15), and housings (95) are provided on both sides of the compression shell (15). A long groove (96) is provided on the surface of the housing (95), the rack (94) is slidably connected to the long groove (96), and the screw rod (98) is rotationally connected to the housing (95).

7. The skid steer loader lifting arm according to claim 6, characterized in that: An opening (911) is provided at the bottom end of the housing (95), and the moving block (99) moves in the opening (911). A connecting rod (93) is provided at the top end of the rack (94), and a side plate (92) is provided on one side of the connecting rod (93). The side plate (92) is fixedly connected to the housing of the hydraulic cylinder (14).

8. The skid steer loader lifting arm according to claim 5, characterized in that: A lower fixed structure (12) for fixing the machine body to the ground is arranged at the bottom end of the machine chassis (13), the lower fixed structure (12) comprising a slide groove (122) opened inside the compression shell (15), two groups of slide grooves (122) are symmetrically opened about the compression shell (15), a slider (123) is slidably connected inside each of the two groups of slide grooves (122), a movable plate (124) is arranged between the two groups of sliders (123), a nail head (125) is arranged at the bottom end of the movable plate (124), and a plurality of groups of nail heads (125) are evenly spaced.

9. The skid steer loader lifting arm according to claim 7, characterized in that: The surface of the compression shell (15) is symmetrically provided with notches (126), the interior of the notch (126) is rotatably connected to a rotating rod (127), and springs (128) are provided at both ends of the rotating rod (127).

10. The skid loader lifting arm according to claim 8, characterized in that: A sloping plate (129) is provided on the surface of the rotating rod (127), one end of the sloping plate (129) protrudes outside the notch (126), and the other end of the sloping plate (129) is located at the upper end of the moving plate (124). A push plate (1210) is provided on one side of the rack (94), and the push plate (1210) is used to push the sloping plate (129).

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