Pull arm top-mounted falling buffer system

Abstract

The utility model provides a pull arm top-mounted falling buffer system which comprises a grab hook and a hook arm, the upper end of the hook arm is provided with the grab hook, and the upper end of a falling limiting beam is provided with a buffer assembly used for buffering impact force of the falling hook arm. The buffer spring can buffer most of the impact force transmitted by the supporting seat, and when the supporting seat drives the follower plate to move downwards by a certain distance, the air spring can buffer most of the impact force transmitted by the follower plate, so that the hook arm is prevented from directly generating large collision impact force between the hook arm and the falling-back limiting beam when falling back in place; the service life of the falling-back limiting beam is guaranteed, the adjusting screw rod can drive the bearing plate to move up and down through the follow-up disc and the annular blocking cover by rotating the adjusting screw rod forwards or reversely, and therefore a worker can adjust the buffering force of the buffering spring according to requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of hooklift trucks, in particular to a hooklift upper mounting fall-back buffer system. Background Art

[0002] A hooklift truck, or a hooklift garbage truck, is a commonly used truck with a removable compartment. It has two functions: self-unloading of goods and automatic loading and unloading of the compartment (i.e., complete loading and unloading). These two functions are completed by a vehicle-mounted working device, which has high working efficiency. The operation and conversion of these two functions are realized by the hydraulic system. The garbage compartment of the hooklift truck can be automatically lifted up and lowered, and the garbage can be dumped by itself.

[0003] Publication No. "CN208439795U" provides a pull arm upper load fall buffer system. When the pull arm upper load flip arm carrying a heavy box falls back to a horizontal state, it can move quickly to save time. When the flip arm is about 300 mm away from the horizontal state, the flip arm position sensor receives a signal and indicates that the speed tends to slow down and gently damp the fall, avoiding impact and impact noise, thereby extending the service life of the pull arm upper load.

[0004] However, the above technical solutions and the prior art have the following defects:

[0005] Although the arm-mounted fall-back buffer system can avoid impact and impact noise through the position sensor, if the position sensor fails during use, the electrical control assembly cannot control the overflow valve to cut off the main oil circuit of the lifting cylinder and allow the hydraulic oil to slowly flow out of the overflow valve. At this time, the flip arm will fall back faster and cause a larger collision with the subframe, which is not practical. Utility Model Content

[0006] The utility model aims to provide a pull arm upper mounting fall-back buffer system to solve the problems raised in the above-mentioned background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A fall-back buffer system installed on a pulling arm comprises a grab hook, a hook arm, a rear roller, a fall-back limiting beam, a sub-beam, a hydraulic cylinder and an inclined wall, wherein the inner wall of the sub-beam is fixedly connected to the fall-back limiting beam, the inner side of the sub-beam is provided with an inclined wall, the inner side of the inclined wall is connected to the hook arm, the upper end of the hook arm is equipped with a grab hook, the tail of the sub-beam is provided with a rear roller, the left and right ends of the hook arm are provided with a hydraulic cylinder, the upper end of the fall-back limiting beam is provided with a buffer component for mitigating the impact force of the hook arm that falls back, and the lower side of the inside of the fall-back limiting beam is provided with an adjustment component for adjusting the buffering force of the buffer component.

[0009] Preferably, the buffer assembly includes a buffer plate, a support seat and a buffer spring, a support seat is provided on the upper inner side of the fall-limiting beam, a buffer plate is provided on the upper end of the support seat, and a buffer spring is installed on the bottom of the support seat.

[0010] Preferably, the adjustment assembly includes a bottom support plate, an adjustment screw, a rotating cap, a supporting plate and a follower plate. The bottom support plate is installed at the middle position of the lower end surface of the fall limit beam, an adjustment screw is arranged at the middle position inside the bottom support plate, a rotating cap is arranged at the lower end of the adjustment screw, a follower plate is arranged at the upper end of the adjustment screw, and a supporting plate is installed at the upper end of the follower plate.

[0011] Preferably, follower plates are symmetrically arranged on the left and right sides and the front and rear sides of the annular side surface of the support seat, a limit cavity is opened inside the fall limit beam, and the limit cavity matches the follower plate, air springs are symmetrically installed on the left and right sides and the front and rear sides inside the limit cavity, a protective sheet is pasted on the upper end surface of the buffer plate, and the material of the protective sheet is high-tear-resistant silicone rubber, and the material of the buffer spring is a rubber spring.

[0012] Preferably, a support block is fixedly connected to the right side of the lower end surface of the bottom support plate, a locking screw is installed inside the support block, and a limit frame is provided on the upper end surface of the bottom support plate, and the limit frame matches the supporting plate.

[0013] Preferably, a limiting groove is provided on the upper end surface of the support plate, and an annular blocking cover is installed on the lower end surface of the support plate.

[0014] Preferably, a groove is provided in the middle of the upper end surface of the fall-limiting beam, a buffer pad is bonded to the lower side of the groove, and the buffer pad is a hollow structure. The buffer pad is annular in shape and is made of sponge rubber.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. In the process of the hook arm falling back and pressing the buffer plate, the buffer spring can buffer most of the impact force transmitted by the support seat. When the support seat drives the follower plate to move down a certain distance, the air spring will buffer most of the impact force transmitted by the follower plate, thereby avoiding a large collision impact force between the hook arm and the return limit beam when it falls back into place, thereby ensuring the service life of the return limit beam. In addition, since this structure does not use electronic components, the failure rate is low during use and the practicability is good.

[0017] 2. The utility model can make the adjusting screw drive the supporting plate to move up and down through the follower plate and the annular cover by rotating the adjusting screw forward or reversely, and the supporting plate moving up and down will increase or weaken the buffering force of the buffer spring, so that the staff can adjust the buffering force of the buffer spring according to the hook arm of different falling impact forces, so as to make the application range of the buffer spring wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 This is a structural diagram of the fall-back limit beam in the utility model;

[0020] Figure 3 It is a front cross-sectional view of the adjustment component and the buffer component of the utility model under pressure;

[0021] Figure 4 It is a partial structural diagram of the adjustment component and the buffer component in the utility model;

[0022] Figure 5 It is a partial structural diagram of the adjustment component in the utility model;

[0023] Figure 6 This is a front cross-sectional view of the adjustment component and the buffer component of the utility model in the unpressurized state

[0024] In the figure: 1. grab hook; 2. hook arm; 3. rear roller; 4. fall-back limit beam; 41. groove; 5. subbeam; 6. hydraulic cylinder; 7. adjustment assembly; 71. bottom support plate; 72. adjustment screw; 73. rotating cap; 74. locking screw; 75. support block; 76. supporting plate; 761. limit groove; 762. annular cover; 77. follower plate; 78. limit frame; 8. buffer assembly; 81. protective sheet; 82. buffer plate; 83. support seat; 84. buffer pad; 85. air spring; 86. follower plate; 87. limit cavity; 88. buffer spring; 9. inclined wall. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-6 , the utility model provides a technical solution:

[0027] Embodiment 1:

[0028] A fall-back buffer system installed on a pulling arm comprises a grab hook 1, a hook arm 2, a rear roller 3, a fall-back limiting beam 4, a sub-beam 5, a hydraulic cylinder 6 and an inclined wall 9. The inner wall of the sub-beam 5 is fixedly connected with the fall-back limiting beam 4, and the fall-back limiting beam 4 and the sub-beam 5 are connected by welding. The fall-back limiting beam 4 will block and limit the falling hook arm 2 to prevent the hook arm 2 from falling back excessively. An inclined wall 9 is arranged on the inner side of the sub-beam 5, and the inclined wall 9 and the hook arm 2 are movably connected. The inclined wall 9 is a structure that can swing up and down. The inclined wall 9 that can swing up and down makes the hook arm 2 have a wider swing range. The hook arm 2 is connected to the inner side of the inclined wall 9, and the hook arm 2 will drive the grab hook 1 to swing.

[0029] A grab hook 1 is installed at the upper end of the hook arm 2, and the grab hook 1 will hook the external self-loading and unloading garbage box. A rear roller 3 is arranged at the tail of the sub-beam 5, and the rear roller 3 is a rotatable structure. The rotatable rear roller 3 makes the external self-loading and unloading garbage box smoother during the loading and unloading process. Hydraulic cylinders 6 are arranged on both ends of the hook arm 2. The hydraulic cylinders 6 are connected to the external automobile hydraulic system through a high-pressure hose. The hydraulic cylinders 6 will drive the hook arm 2 to swing up and down when working. Since the internal detailed structure and working principle of the hydraulic cylinder 6 belong to the relatively mature technology in the prior art, they will not be described in detail here. A buffer component 8 for alleviating the impact force of the hook arm 2 that has fallen back is arranged on the upper end of the return limit beam 4, and an adjustment component 7 for adjusting the buffering force of the buffer component 8 is arranged on the lower side of the return limit beam 4.

[0030] The buffer assembly 8 includes a buffer plate 82, a support seat 83 and a buffer spring 88. A support seat 83 is arranged on the upper side of the interior of the fall-back limit beam 4. The support seat 83 is connected to the buffer plate 82 and the follower plate 86 by welding. The support seat 83 will support the buffer plate 82. A buffer plate 82 is arranged on the upper end of the support seat 83. The buffer plate 82 will support the protective sheet 81. A buffer spring 88 is installed at the bottom of the support seat 83. The buffer spring 88 is made of rubber spring. The buffer spring 88 made of rubber spring has a small elastic modulus and has a large elastic deformation after being loaded, so as to absorb impact and vibration force, thereby being able to buffer most of the impact force transmitted from the support seat 83. Follower plates 86 are symmetrically arranged on the left and right sides and the front and rear sides of the annular side of the support seat 83. The follower plate 86 will press the air spring 85 when it moves downward, so that the air spring 85 can buffer part of the impact force of the support seat 83 through the follower plate 86.

[0031] A protective sheet 81 is pasted on the upper end surface of the buffer plate 82, and the material of the protective sheet 81 is high-tear-resistant silicone rubber. The protective sheet 81 made of high-tear-resistant silicone rubber can prevent hard contact and collision between the buffer plate 82 and the hook arm 2. A limiting cavity 87 is provided inside the fall-back limiting beam 4, and the limiting cavity 87 matches the follower plate 86. The limiting cavity 87 will limit and guide the follower plate 86 to prevent the support seat 83 from offset or shaking during use. Air springs 85 are symmetrically installed on the left and right sides and the front and rear sides of the limiting cavity 87. Four groups of air springs 85 are installed, and the specifications of the four groups of air springs 85 are the same. The air spring 85 is made of a membrane air spring 85. The air spring 85 made of a membrane air spring 85 has a good impact mitigation effect and a small size, so as to buffer most of the impact force transmitted from the follower plate 86.

[0032] A groove 41 is provided in the middle position of the upper end surface of the return-limiting beam 4, and the groove 41 matches the buffer plate 82. The groove 41 facilitates the buffer plate 82 to be located inside the return-limiting beam 4, so that the hook arm 2 can contact the return-limiting beam 4 when it falls back into place. A buffer pad 84 is bonded to the lower side of the groove 41, and the buffer pad 84 is a hollow structure. The buffer pad 84 with a hollow structure has a good buffering effect. The buffer pad 84 is annular in shape and made of sponge rubber. The buffer pad 84 made of sponge rubber and in annular shape can absorb most of the impact force transmitted by the buffer plate 82, thereby avoiding hard contact between the buffer plate 82 and the return-limiting beam 4 when it moves downward.

[0033] Embodiment 2:

[0034] On the basis of Example 1, in this embodiment, by rotating the adjusting screw 72 forward or reversely, the adjusting screw 72 can drive the supporting plate 76 to move up and down through the follower plate 77 and the annular cover 762, and the supporting plate 76 moving up and down will increase or weaken the buffering force of the buffer spring 88, so that the staff can adjust the buffering force of the buffer spring 88 according to the hook arm 2 with different fall-back impact forces, so that the buffer spring 88 has a wider range of application.

[0035] The adjustment assembly 7 includes a bottom support plate 71, an adjustment screw 72, a rotating cap 73, a supporting plate 76 and a follower plate 77. The bottom support plate 71 is installed at the middle position of the lower end surface of the fall-back limit beam 4. The bottom support plate 71 supports the adjustment screw 72. The adjustment screw 72 is arranged at the middle position inside the bottom support plate 71. The adjustment screw 72 is connected to the follower plate 77 by welding. A vertical internal threaded through hole is opened at the middle position inside the bottom support plate 71, and the vertical internal threaded through hole is meshed with the adjustment screw 72. The meshing vertical internal threaded through hole and the adjusting screw 72 facilitate the height adjustment of the supporting plate 76. A rotating cap 73 is provided at the lower end of the adjusting screw 72. The rotating cap 73 is hexagonal in shape. The rotating cap 73 is connected to the adjusting screw 72 by welding. The rotating cap 73 facilitates the staff to rotate the adjusting screw 72 with the help of an external wrench. A follower plate 77 is provided at the upper end of the adjusting screw 72. The follower plate 77 is circular in shape. The follower plate 77 facilitates the adjusting screw 72 to drive the supporting plate 76 to move up and down.

[0036] A supporting plate 76 is installed on the upper end of the follower plate 77, and the supporting plate 76 supports the buffer spring 88. A supporting block 75 is fixedly connected to the right side of the lower end surface of the bottom support plate 71. The supporting block 75 is connected to the bottom support plate 71 by welding. The supporting block 75 supports the locking screw 74. A transverse internal threaded through hole is opened on the lower side of the support block 75, and the transverse internal threaded through hole is meshed with the locking screw 74. A locking screw 74 is installed inside the support block 75. The meshed transverse internal threaded through hole and the locking screw 74 will position the adjusting screw 72 to prevent the adjusting screw 72 from rotating when it is not adjusted. A limit frame 78 is provided on the upper end surface of the bottom support plate 71, and the limit frame 78 matches the supporting plate 76. The limit frame 78 is connected to the bottom support plate 71 by welding. The limit frame 78 will limit and guide the supporting plate 76 to prevent the supporting plate 76 from shaking, rotating or deflecting during use. A limit groove 761 is provided on the upper end surface of the supporting plate 76. The limit groove 761 will limit the bottom of the buffer spring 88. An annular blocking cover 762 is installed on the lower end surface of the supporting plate 76. The annular blocking cover 762 will block and limit the follower plate 77 to prevent the follower plate 77 from loosening and slipping during rotation and use.

[0037] Working principle: After the hydraulic cylinder 6 drives the hook arm 2 to fall back a certain distance, the lower end of the hook arm 2 will first contact and press the protective sheet 81, so that the buffer plate 82 drives the support seat 83 to move downward. In this process, the impact force generated by the fall will be transmitted to the support seat 83 through the buffer plate 82, and the support seat 83 will transmit the impact force to the buffer spring 88 and the follower plate 86 respectively. At this time, the buffer spring 88 will buffer part of the impact force. When the support seat 83 drives the follower plate 86 to move down a certain distance, the air spring 85 will buffer most of the impact force transmitted by the follower plate 86, thereby avoiding a large impact force between the hook arm 2 and the fall limit beam 4 when it falls back into place, thereby ensuring the service life of the fall limit beam 4; in the later use process, when it is necessary to adjust the buffer force of the buffer spring 88, The staff first loosens the locking screw 74 with the help of an external wrench, and then can use the external wrench to rotate the adjusting screw 72 forward by turning the cap 73, so that the adjusting screw 72 drives the supporting plate 76 to move upward through the follower plate 77 and the annular baffle 762, and the upward moving supporting plate 76 will further squeeze the buffer spring 88. At this time, the elastic buffering force of the squeezed buffer spring 88 will be weakened, and the upward squeezing force will be strengthened. Similarly, when the adjusting screw 72 is reversed, the elastic buffering force of the buffer spring 88 will increase, and the upward squeezing force will be weakened, so that the staff can adjust the buffering force of the buffer spring 88 according to needs, so that the buffer plate 82 can buffer and protect the hook arm 2 with different fall impact forces. After the adjustment is completed, the locking screw 74 can be tightened to prevent the adjusting screw 72 from rotating again.

[0038] 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 pull arm upper mounting fall-back buffer system, comprising a grab hook (1), a hook arm (2), a rear roller (3), a fall-back limit beam (4), a secondary beam (5), a hydraulic cylinder (6) and an inclined wall (9), characterized in that: The inner wall of the auxiliary beam (5) is fixedly connected to a fall-back limiting beam (4); an inclined wall (9) is arranged on the inner side of the auxiliary beam (5); a hook arm (2) is connected to the inner side of the inclined wall (9); a grab hook (1) is installed on the upper end of the hook arm (2); and a rear roller (3) is arranged at the tail of the auxiliary beam (5); The left and right ends of the hook arm (2) are both provided with hydraulic cylinders (6); the upper end of the fall-back limit beam (4) is provided with a buffer component (8) for relieving the impact force of the falling hook arm (2); and the lower side of the fall-back limit beam (4) is provided with an adjustment component (7) for adjusting the buffer force of the buffer component (8).

2. The pull arm upper mounting fall-back buffer system according to claim 1, characterized in that: The buffer assembly (8) comprises a buffer plate (82), a support seat (83) and a buffer spring (88); the support seat (83) is arranged on the upper side of the return limit beam (4); the buffer plate (82) is arranged on the upper end of the support seat (83); and the buffer spring (88) is installed on the bottom of the support seat (83).

3. The pull arm upper mounting fall-back buffer system according to claim 1, characterized in that: The adjustment assembly (7) comprises a bottom support plate (71), an adjustment screw rod (72), a rotating cap (73), a supporting plate (76) and a follower plate (77); the bottom support plate (71) is installed at the middle position of the lower end surface of the return limit beam (4); the adjustment screw rod (72) is arranged at the middle position inside the bottom support plate (71); the lower end of the adjustment screw rod (72) is provided with a rotating cap (73); the upper end of the adjustment screw rod (72) is provided with a follower plate (77); and the upper end of the follower plate (77) is provided with a supporting plate (76).

4. The pull arm upper mounting fall-back buffer system according to claim 2, characterized in that: The left and right sides and the front and rear sides of the annular side surface of the support seat (83) are symmetrically provided with follower plates (86); a limit cavity (87) is provided inside the fall-back limit beam (4), and the limit cavity (87) matches the follower plate (86); air springs (85) are symmetrically installed inside the limit cavity (87) on the left and right sides and the front and rear sides; a protective sheet (81) is pasted on the upper end surface of the buffer plate (82), and the material of the protective sheet (81) is high tear-resistant silicone rubber; the material of the buffer spring (88) is a rubber spring.

5. The pull arm upper mounting fall-back buffer system according to claim 3, characterized in that: A support block (75) is fixedly connected to the right side of the lower end surface of the bottom support plate (71), a locking screw (74) is installed inside the support block (75), and a limit frame (78) is arranged on the upper end surface of the bottom support plate (71), and the limit frame (78) matches the supporting plate (76).

6. The pull arm upper mounting fall-back buffer system according to claim 3, characterized in that: The upper end surface of the support plate (76) is provided with a limiting groove (761), and the lower end surface of the support plate (76) is provided with an annular blocking cover (762).

7. The pull arm upper mounting fall-back buffer system according to claim 1, characterized in that: A groove (41) is provided in the middle of the upper end surface of the fall-back limiting beam (4), a buffer pad (84) is bonded to the lower side of the groove (41), and the buffer pad (84) is a hollow structure. The buffer pad (84) is annular in shape and is made of sponge rubber.

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