Fallback buffering mechanism installed on pull arm and gently falling back
By designing a pull-arm upper-mounted fall-off buffer mechanism that includes a piston plate, a fixed disc, and a buffer spring, and adjusting the flow of hydraulic oil to control the damping force, the impact problem during the fall of the pull-arm garbage truck was solved, extending the equipment's lifespan and reducing noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANGZHOU FUAIWO MASCH CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-05-26
AI Technical Summary
When the hooklift garbage truck unloads its container and lowers to a horizontal position, it will impact the truck chassis and the upper subframe of the hooklift, resulting in a reduced service life and noise generation.
A smooth-falling pull arm upper-mounted fall-off buffer mechanism was designed. Through the combination of piston plate, fixed plate, solenoid valve and buffer spring, the flow of hydraulic oil is adjusted to control the damping force to achieve the buffering effect, and the magnitude of the damping force can be adjusted by knob.
It effectively reduces the impact force during the fall, extends the service life of the boom superstructure, reduces noise, and improves the stability and safety of the equipment.
Smart Images
Figure CN224278453U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hooklift truck technology, specifically to a hooklift upper assembly drop buffer mechanism that allows for a smooth drop. Background Technology
[0002] A hooklift truck, also known as a garbage truck, is a commonly used detachable container truck that combines self-unloading of goods with automatic loading and unloading of the container (i.e., full loading and unloading). Both functions are performed by a single onboard working device, resulting in high efficiency. The operation and switching between these functions are achieved through a hydraulic system. The garbage container of the hooklift truck can be automatically lifted and lowered, and can also dump garbage automatically.
[0003] Since the weight of the garbage container, or the weight of the garbage inside, often reaches tens of tons, the tipping arm of the hook-lift garbage truck will cause a certain impact on the garbage truck chassis and the hook-lift subframe when the container is unloaded or the hook-lift container falls back to a horizontal position. This impact will generate noise and reduce the service life of the hook-lift subframe.
[0004] Therefore, we propose a gently sloping pull arm with a fall-off buffer mechanism. Utility Model Content
[0005] The purpose of this invention is to provide a gently sloping pull arm with a fall-off buffer mechanism to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a gently sloping pull arm with a fall-off buffer mechanism, comprising a subframe, a lifting cylinder rotatably mounted inside one end of the subframe, a pull arm rotatably mounted in the middle of the subframe, a connecting rod fixedly mounted in the middle of the bottom of the subframe, a buffer assembly rotatably connected to the connecting rod inside the subframe, a connecting pin rotatably connected to the top of the buffer assembly, fixing rings rotatably connected to both ends of the connecting pin, the fixing rings being fixedly mounted to one end of the cylinder of the lifting cylinder, the movable end of the lifting cylinder being rotatably connected to both sides of the pull arm, the buffer assembly including an upper connecting frame rotatably connected to the connecting pin, and a lower connecting frame rotatably connected to the connecting rod, a hydraulic cylinder integrally mounted on the top of the lower connecting frame, a telescopic rod fixedly mounted on the bottom of the upper connecting frame and slidably and sealingly connected to the top of the hydraulic cylinder, and a buffer spring sleeved on the outside of the hydraulic cylinder.
[0007] Optionally, a piston plate located inside a hydraulic cylinder is fixedly installed at the bottom of the telescopic rod. The piston plate is slidably connected to the inside of the hydraulic cylinder in a sealed manner. A fixed plate located below the piston plate is fixedly installed inside the hydraulic cylinder. A solenoid valve is fixedly installed in the middle of the fixed plate.
[0008] Optionally, two connecting pipes are fixedly installed on the top of the lower connecting frame and the top of the inside of the hydraulic cylinder. The two connecting pipes are slidably connected to the piston plate through a seal. The two connecting pipes are provided with liquid inlets at the mounting ends of the lower connecting frame and the hydraulic cylinder.
[0009] Optionally, a fixing bracket is fixedly installed at the other end of the two connecting pipes. A fixing rod is integrally provided at the bottom of the fixing bracket, and the other end of the fixing rod is fixedly installed to the top of the lower connecting bracket and the top of the inside of the hydraulic cylinder, respectively.
[0010] Optionally, the fixed rod is slidably connected to a movable plate located below the fixed frame, and the fixed frame is slidably connected to a retaining plate located below the movable plate. A retaining plug located below the connecting pipe is fixedly installed on the top of the movable plate. The top of the retaining plug is in tight contact with the opening of the connecting pipe. A retaining spring is provided on the top of the retaining plate. The top of the retaining spring is in tight contact with the bottom of the movable plate, and the bottom of the retaining spring is fixedly installed with the top of the retaining plate.
[0011] Optionally, a threaded rod is rotatably connected to the lower part of the clamping plate, and a knob is fixedly installed at the other end of the threaded rod. The two threaded rods are respectively connected to the lower connecting frame and the hydraulic cylinder through thread. The clamping plug is hemispherical, and the diameter of the clamping plug is larger than the inner diameter of the connecting pipe. The two connecting pipes are fixedly connected to the fixed plate through thread.
[0012] Optionally, the top of the buffer spring is in close contact with the bottom of the upper connecting frame, and the bottom of the buffer spring is in close contact with the top of the lower connecting frame.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. The gently sloping telescopic arm is equipped with a sloping buffer mechanism. By setting up a piston plate and a fixed plate, when the telescopic rod is extended, the hydraulic oil located above the piston plate enters the connecting pipe through the inlet of a connecting pipe, and then enters the cavity formed by the fixed plate and the hydraulic cylinder through the connecting pipe. The hydraulic oil inside the connecting pipe squeezes the pressure plug, causing the pressure plug to loosen from the connecting pipe and squeeze the pressure spring. Meanwhile, the original hydraulic oil in the cavity enters the space between the piston plate and the fixed plate through the opened solenoid valve. When the telescopic rod retracts, the oil between the piston plate and the fixed plate enters the cavity formed by the fixed plate and the hydraulic cylinder through the reopened solenoid valve, and is then transported to the top of the piston plate through the inlet of another connecting pipe.
[0015] 2. The gently sloping telescopic arm is equipped with a sloping buffer mechanism. By setting a threaded rod and a retaining plate, rotating the knob causes the retaining plate to move a certain displacement. The movement of the retaining plate changes the spring force of the retaining spring. The spring force of the retaining spring acts on the opening of the connecting pipe through the movable plate and the retaining plug. The retaining plug cooperates with the connecting pipe to press the opening of the connecting pipe, so that the oil flowing into the opening of the connecting pipe must reach a pressure sufficient to overcome the spring force in order to push open the retaining plug and unload. The oil pressure inside the hydraulic cylinder can be changed by manually rotating the knob, thereby controlling the damping force of the buffer assembly. Moreover, the damping of the extension and compression of the telescopic rod can be adjusted separately. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the pull arm with a smooth descent buffer mechanism according to the present invention.
[0017] Figure 2 This is a schematic diagram of the subframe of a pull arm with a smooth descent buffer mechanism according to the present invention.
[0018] Figure 3 This is a schematic diagram of the lifting cylinder of the lifting arm with a smooth descent buffer mechanism according to the present invention.
[0019] Figure 4 This is a schematic diagram of the structure of a buffer assembly for a pull arm with a smooth descent buffer mechanism according to the present invention.
[0020] Figure 5 This utility model relates to a gently sloping pull arm with a fall-off buffer mechanism. Figure 4 Enlarged view of point A in the middle;
[0021] Figure 6 This is a schematic diagram of the threaded rod of the pull arm with a smooth descent buffer mechanism according to the present invention.
[0022] In the diagram: 1. Subframe; 2. Lifting cylinder; 3. Pull arm; 4. Connecting rod; 5. Buffer assembly; 501. Upper connecting frame; 502. Lower connecting frame; 503. Hydraulic cylinder; 504. Telescopic rod; 505. Buffer spring; 506. Piston plate; 507. Fixed plate; 508. Solenoid valve; 509. Connecting pipe; 510. Liquid inlet; 511. Fixed frame; 512. Fixed rod; 513. Movable plate; 514. Clamping plug; 515. Threaded rod; 516. Clamping plate; 517. Clamping spring; 518. Knob; 6. Connecting pin; 7. Retaining ring. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] Please see Figures 1 to 6 This utility model provides a smooth-falling pull arm upper-mounted fall buffer mechanism, including a subframe 1, a lifting cylinder 2 rotatably mounted inside one end of the subframe 1, a pull arm 3 rotatably mounted in the middle of the subframe 1, a connecting rod 4 fixedly mounted in the middle of the bottom of the subframe 1, a buffer assembly 5 located inside the subframe 1 rotatably connected to the connecting rod 4, a connecting pin 6 rotatably connected to the top of the buffer assembly 5, and fixing rings 7 rotatably connected to both ends of the connecting pin 6. The fixing rings 7 are fixedly mounted to one end of the cylinder of the lifting cylinder 2, and the movable end of the lifting cylinder 2 is rotatably connected to both sides of the pull arm 3. The buffer assembly 5 includes an upper connecting frame 501 rotatably connected to the connecting pin 6 and a lower connecting frame 502 rotatably connected to the connecting rod 4. A hydraulic cylinder 503 is integrally mounted on the top of the lower connecting frame 502, and a telescopic rod 504 is fixedly mounted on the bottom of the upper connecting frame 501 and is slidably and sealingly connected to the top of the hydraulic cylinder 503. A buffer spring 505 is sleeved on the outside of the hydraulic cylinder 503.
[0025] A piston plate 506 located inside a hydraulic cylinder 503 is fixedly installed at the bottom of the telescopic rod 504. The piston plate 506 is in a sealed sliding connection with the inside of the hydraulic cylinder 503. A fixed plate 507 located below the piston plate 506 is fixedly installed inside the hydraulic cylinder 503. A solenoid valve 508 is fixedly installed in the middle of the fixed plate 507.
[0026] Two connecting pipes 509 are fixedly installed on the top of the lower connecting frame 502 and the top inside the hydraulic cylinder 503. The two connecting pipes 509 are slidably connected to the piston plate 506 through a seal. The two connecting pipes 509 are provided with liquid inlets 510 at the mounting ends of the lower connecting frame 502 and the hydraulic cylinder 503.
[0027] A fixing bracket 511 is fixedly installed at the other end of the two connecting pipes 509. A fixing rod 512 is integrally provided at the bottom of the fixing bracket 511. The other end of the fixing rod 512 is fixedly installed to the top of the lower connecting bracket 502 and the top of the inside of the hydraulic cylinder 503, respectively. By setting the piston plate 506 and the fixing disc 507, when the telescopic rod 504 is extended, the hydraulic oil located above the piston plate 506 enters the connecting pipe 509 through the inlet 510 of the connecting pipe 509, and then enters the cavity formed by the fixing disc 507 and the hydraulic cylinder 503 through the connecting pipe 509. The hydraulic oil inside the connecting pipe 509 squeezes the abutment plug 514, causing the abutment plug 514 to loosen from the connecting pipe 509 and squeeze the abutment spring 517. The hydraulic oil originally in the cavity enters between the piston plate 506 and the fixed plate 507 through the opened solenoid valve 508. When the telescopic rod 504 retracts, the oil between the piston plate 506 and the fixed plate 507 enters the cavity formed by the fixed plate 507 and the hydraulic cylinder 503 through the reopened solenoid valve 508, and is then transported to the top of the piston plate 506 through the inlet 510 of another connecting pipe 509.
[0028] The fixed rod 512 is slidably connected to the movable plate 513 located below the fixed frame 511. The fixed frame 511 is slidably connected to the abutment plate 516 located below the movable plate 513. The top of the movable plate 513 is fixedly installed with the abutment plug 514 located below the connecting pipe 509. The top of the abutment plug 514 is in tight contact with the opening of the connecting pipe 509. The top of the abutment plate 516 is provided with the abutment spring 517. The top of the abutment spring 517 is in tight contact with the bottom of the movable plate 513. The bottom of the abutment spring 517 is fixedly installed with the top of the abutment plate 516.
[0029] A threaded rod 515 is rotatably connected below the clamping plate 516. A knob 518 is fixedly installed at the other end of the threaded rod 515. The two threaded rods 515 are respectively connected to the lower connecting frame 502 and the hydraulic cylinder 503 via sealed threaded connections. The clamping plug 514 is hemispherical, and its diameter is larger than the inner diameter of the connecting pipe 509. The two connecting pipes 509 are fixedly connected to the fixed plate 507. By setting the threaded rod 515 and the clamping plate 516, rotating the knob 518 causes the clamping plate 516 to move a certain displacement. The movement of the clamping plate 516 changes the clamping spring 5. The spring force of spring 517 acts on the opening of connecting pipe 509 through movable plate 513 and pressing plug 514. The pressing plug 514 cooperates with connecting pipe 509 to press the opening of connecting pipe 509, so that the oil flowing into the opening of connecting pipe 509 must reach a pressure sufficient to overcome the spring force in order to push open pressing plug 514 for unloading. The oil pressure inside hydraulic cylinder 503 can be changed by manually rotating knob 518, thereby controlling the damping force of buffer assembly 5. Moreover, the damping of extension and compression of telescopic rod 504 can be adjusted separately.
[0030] The top of the buffer spring 505 is in close contact with the bottom of the upper connecting frame 501, and the bottom of the buffer spring 505 is in close contact with the top of the lower connecting frame 502.
[0031] Working principle:
[0032] When the telescopic rod 504 is extended, the hydraulic oil above the piston plate 506 enters the connecting pipe 509 through the inlet 510, and then enters the cavity formed by the fixed plate 507 and the hydraulic cylinder 503 through the connecting pipe 509. The hydraulic oil inside the connecting pipe 509 squeezes the stopper 514, causing the stopper 514 to loosen from the connecting pipe 509 and squeeze the stop spring 517. Meanwhile, the hydraulic oil in the cavity enters the space between the piston plate 506 and the fixed plate 507 through the opened solenoid valve 508. When the telescopic rod 504 retracts, the oil between the piston plate 506 and the fixed plate 507 enters the cavity formed by the fixed plate 507 and the hydraulic cylinder 503 through the reopened solenoid valve 508, and then enters the cavity through the inlet of another connecting pipe 509. The oil is fed to the piston plate 506 above the nozzle 510. Rotating the knob 518 causes the clamping plate 516 to move a certain displacement. The movement of the clamping plate 516 changes the spring force of the clamping spring 517. The spring force of the clamping spring 517 acts on the opening of the connecting pipe 509 through the movable plate 513 and the clamping plug 514. The clamping plug 514 cooperates with the connecting pipe 509 to press the opening of the connecting pipe 509, so that the oil flowing into the opening of the connecting pipe 509 must reach a pressure sufficient to overcome the spring force in order to push open the clamping plug 514 for unloading. The oil pressure inside the hydraulic cylinder 503 can be changed by manually rotating the knob 518, thereby controlling the damping force of the buffer assembly 5. Moreover, the damping of the extension and compression of the telescopic rod 504 can be adjusted separately.
[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A gently sloping pull-arm upper-mounted fall-off buffer mechanism, comprising a subframe (1), characterized in that, A lifting cylinder (2) is rotatably mounted inside one end of the subframe (1). A pull arm (3) is rotatably mounted in the middle of the subframe (1). A connecting rod (4) is fixedly mounted in the middle of the bottom of the subframe (1). A buffer assembly (5) located inside the subframe (1) is rotatably connected to the connecting rod (4). A connecting pin (6) is rotatably connected to the top of the buffer assembly (5). Fixed rings (7) are rotatably connected to both ends of the connecting pin (6). The fixed rings (7) are fixedly mounted to one end of the cylinder of the lifting cylinder (2). The movable end of the lifting cylinder (2) is rotatably connected to both sides of the pull arm (3). The buffer assembly (5) includes an upper connecting frame (501) rotatably connected to the connecting pin (6) and a lower connecting frame (502) rotatably connected to the connecting rotating rod (4). A hydraulic cylinder (503) is integrally provided on the top of the lower connecting frame (502). A telescopic rod (504) is fixedly installed at the bottom of the upper connecting frame (501) and is slidably and sealingly connected to the top of the hydraulic cylinder (503). A buffer spring (505) is sleeved on the outside of the hydraulic cylinder (503).
2. The gently descent buffer mechanism mounted on the pull arm according to claim 1, characterized in that, The bottom of the telescopic rod (504) is fixedly installed with a piston plate (506) located inside the hydraulic cylinder (503). The piston plate (506) is in a sealed sliding connection with the inside of the hydraulic cylinder (503). The inside of the hydraulic cylinder (503) is fixedly installed with a fixed plate (507) located below the piston plate (506). The middle part of the fixed plate (507) is fixedly installed with a solenoid valve (508).
3. The gently descent buffer mechanism mounted on the pull arm according to claim 2, characterized in that, Two connecting pipes (509) are fixedly installed on the top of the lower connecting frame (502) and the top inside the hydraulic cylinder (503). The two connecting pipes (509) are sealed and slidably connected to the piston plate (506). The two connecting pipes (509) are provided with liquid inlets (510) at the mounting ends of the lower connecting frame (502) and the hydraulic cylinder (503).
4. The gently descent buffer mechanism mounted on the pull arm according to claim 3, characterized in that, The other end of the two connecting pipes (509) is fixedly installed with a fixing frame (511). The bottom of the fixing frame (511) is integrally provided with a fixing rod (512). The other end of the fixing rod (512) is fixedly installed with the top of the lower connecting frame (502) and the top of the inside of the hydraulic cylinder (503).
5. The gently descent buffer mechanism mounted on the pull arm according to claim 4, characterized in that, The fixed rod (512) is slidably connected to a movable plate (513) located below the fixed frame (511). The fixed frame (511) is slidably connected to a retaining plate (516) located below the movable plate (513). A retaining plug (514) located below the connecting pipe (509) is fixedly installed on the top of the movable plate (513). The top of the retaining plug (514) is in close contact with the opening of the connecting pipe (509). A retaining spring (517) is provided on the top of the retaining plate (516). The top of the retaining spring (517) is in close contact with the bottom of the movable plate (513). The bottom of the retaining spring (517) is fixedly installed on the top of the retaining plate (516).
6. The gently descent buffer mechanism mounted on the pull arm according to claim 5, characterized in that, A threaded rod (515) is rotatably connected to the lower part of the clamping plate (516). A knob (518) is fixedly installed at the other end of the threaded rod (515). The two threaded rods (515) are respectively sealed and threadedly connected to the lower connecting frame (502) and the hydraulic cylinder (503). The clamping plug (514) is hemispherical. The diameter of the clamping plug (514) is larger than the inner diameter of the connecting pipe (509). The two connecting pipes (509) are fixedly connected to the fixed plate (507).
7. The gently descent buffer mechanism mounted on a pull arm according to claim 1, characterized in that, The top of the buffer spring (505) is in close contact with the bottom of the upper connecting frame (501), and the bottom of the buffer spring (505) is in close contact with the top of the lower connecting frame (502).