Oil cylinder driving follow-up system, traction device and garbage truck

Abstract

According to the oil cylinder driving follow-up system, the traction device and the garbage truck, during box pulling or box unloading operation, stretching and retracting of the lifting oil cylinder can be achieved through the lifting reversing valve so as to drive the moving arm to act, and in the moving arm acting process, the lifting oil cylinder is driven by the lifting reversing valve to move. A rod cavity and a rodless cavity of the swing arm oil cylinder can be communicated with an oil return pipeline through the swing arm reversing valve, so that the swing arm oil cylinder can realize communication between the rod cavity and the rodless cavity through the swing arm reversing valve, and a piston rod of the swing arm oil cylinder can automatically retract or stretch out due to pressure or pulling force borne by the two ends; the swing arm can correspondingly perform inward folding or outward unfolding rotation action along with the action of the movable arm, so that the follow-up effect that the swing arm acts along with the action of the movable arm can be realized, the operation is simple and convenient, the safety and the reliability are realized, the structural damage of the pull arm system can be prevented, and the service life of the equipment is long.

Description

Technical Field

[0001] This application relates to the field of sanitation equipment technology, and in particular to a hydraulic cylinder driven follow-up system, a traction device, and a garbage truck. Background Technology

[0002] Garbage trucks, also known as waste collection trucks or waste collection vehicles, are vehicles specifically designed for collecting and transporting solid waste in urban and rural areas. These vehicles are essential for maintaining environmental cleanliness and public health.

[0003] Existing modular waste compression stations employ both horizontal and vertical compression configurations, with the vertical configuration accounting for over 30% in the last two years. The waste containers in vertical stations are placed vertically, and the industry currently uses hook-lift, wire rope, and corner-joint types of vehicles to support them. Hook-lift vehicles are the primary choice for vertical stations due to their high safety and reliability, as well as their lightweight design.

[0004] Hook-lift garbage trucks mainly use a hydraulic system to control the lifting arm to complete the loading, unloading, transportation, and dumping of garbage containers. However, the current hook-lift garbage trucks have complicated lifting and unloading processes. Improper operation can easily lead to abnormal stress on structural components and damage to them, reducing the service life of the lifting arm system. In addition, the complicated actions make it easy for operators to make mistakes, posing safety hazards. Utility Model Content

[0005] The purpose of this application is to provide a hydraulic cylinder-driven follow-up system, a traction device, and a garbage truck that is simple to operate, safe and reliable, and can prevent damage to the boom system structure and has a long service life.

[0006] The embodiments of this application can be implemented as follows:

[0007] In a first aspect, this utility model provides a hydraulic cylinder driven follow-up system for a traction device. The traction device includes a base frame, a lifting cylinder, a moving arm, a rotating arm, a swing arm cylinder, and a swing arm. The two ends of the lifting cylinder are respectively hinged to the base frame and the moving arm. One end of the lifting cylinder is hinged to one end of the base frame, and the other end of the lifting cylinder is hinged to the middle of the moving arm. One end of the moving arm is hinged to the other end of the base frame. One end of the swing arm is hinged to the other end of the moving arm. The other end of the swing arm has a hook for hooking onto a box. The two ends of the swing arm cylinder are respectively hinged to the moving arm and the swing arm.

[0008] The hydraulic cylinder drive follow-up system includes an oil inlet line, a lifting reversing valve, a swing arm reversing valve, and a return line.

[0009] The lifting directional valve and the swing arm directional valve are both connected between the oil inlet line and the oil return line;

[0010] The lifting directional valve enables one of the rod-side chamber and the rodless chamber of the lifting cylinder to be connected to the oil inlet line, and the other to be connected to the oil return line.

[0011] The swing arm reversing valve enables one of the rod-side chamber and the rodless chamber of the swing arm cylinder to be connected to the oil inlet pipe, and the other to be connected to the oil return pipe.

[0012] Wherein, when the lifting reversing valve connects the rodless chamber or the rod chamber of the lifting cylinder to the oil inlet pipe, the swing arm reversing valve can also connect both the rod chamber and the rodless chamber of the swing arm cylinder to the oil return pipe.

[0013] In an optional embodiment, the rocker arm reversing valve is a Y-type reversing valve, having a P1 port, a T1 port, an A1 port, and a B1 port; the P1 port is connected to the oil inlet line, the T1 port is connected to the oil return line, and the A1 port and the B1 port are respectively used to connect the rodless chamber and the rod chamber of the rocker arm cylinder.

[0014] When the swing arm reversing valve is in the first state, port P1 and port A1 are connected, and port B1 and port T1 are connected.

[0015] When the swing arm reversing valve is in the second state, port P1 is blocked, and ports A1 and B1 are both connected to port T1.

[0016] When the swing arm reversing valve is in the third state, port P1 is connected to port B1, and port A1 is connected to port T1.

[0017] In an optional embodiment, the swing arm reversing valve is a Y-type three-position six-way reversing valve, which also has a P3 port and a T3 port. The P3 port is connected to the oil inlet pipeline, and the T3 port is connected to the oil return pipeline.

[0018] When the swing arm reversing valve is in the first or third state, the P3 port and the T3 port are blocked.

[0019] When the swing arm reversing valve is in the second state, the P3 port and the T3 port are connected.

[0020] In an optional embodiment, the lifting directional valve has a P2 port, a T2 port, an A2 port, and a B2 port; the P2 port is connected to the oil inlet line, the T2 port is connected to the oil return line, and the A2 port and the B2 port are respectively used to connect to the rodless chamber and the rod chamber of the lifting cylinder;

[0021] When the lifting reversing valve is in the first state, port P2 is connected to port A2, and port B2 is connected to port T2.

[0022] When the lifting reversing valve is in the third state, port P2 is connected to port B2, and port A2 is connected to port T2.

[0023] In an optional embodiment, the lifting directional valve is a Y-type directional valve. When the lifting directional valve is in the second state, the P2 port is blocked, and both the A2 port and the B2 port are connected to the T2 port.

[0024] And / or,

[0025] The lifting directional valve is a Y-type three-position six-way directional valve, which also has a P4 port and a T4 port. The P4 port is connected to the oil inlet line, and the T4 port is connected to the oil return line.

[0026] When the lifting reversing valve is in the first or third state, the P4 port and the T4 port are blocked.

[0027] When the lifting reversing valve is in the second state, the P4 port and the T4 port are connected.

[0028] In an optional embodiment, the hydraulic cylinder drive follow-up system further includes an openable or closed swing arm solenoid valve and / or an adjustable throttle valve, wherein the swing arm solenoid valve and / or the throttle valve are connected between the swing arm reversing valve and the swing arm cylinder.

[0029] When the lifting reversing valve connects the rodless or rod chamber of the lifting cylinder to the oil inlet line, and the swing arm solenoid valve is opened, the swing arm reversing valve can connect both the rod chamber and the rodless chamber of the swing arm cylinder to the return oil line.

[0030] In an optional embodiment, the rocker arm reversing valve is a Y-type reversing valve, having a P1 port, a T1 port, an A1 port, and a B1 port; the P1 port is connected to the oil inlet line, the T1 port is connected to the oil return line, and the A1 port and the B1 port are respectively used to connect the rodless chamber and the rod chamber of the rocker arm cylinder.

[0031] The lifting directional valve has a P2 port, a T2 port, an A2 port, and a B2 port; the P2 port is connected to the oil inlet line, the T2 port is connected to the oil return line, and the A2 port and the B2 port are respectively used to connect the rodless chamber and the rod chamber of the lifting cylinder;

[0032] When the lifting reversing valve is in the first state, port P2 is connected to port A2, and port B2 is connected to port T2.

[0033] When the lifting reversing valve is in the third state, port P2 is connected to port B2, and port A2 is connected to port T2.

[0034] When the lifting directional valve is in the first or third state and the swing arm solenoid valve is open, the swing arm directional valve can switch to the second state to block the P1 port, while the A1 port and the B1 port are both connected to the T1 port.

[0035] In an optional embodiment, the cylinder drive follow-up system further includes a balance valve assembly and / or an openable or closeable lifting solenoid valve, wherein the balance valve assembly is connected between the lifting cylinder and the lifting directional valve, and the lifting solenoid valve is connected between the rodless chamber of the lifting cylinder and the lifting directional valve.

[0036] When the lifting solenoid valve is open, the lifting directional valve can connect both the rod-side and rodless-side chambers of the lifting cylinder to the return oil line.

[0037] Secondly, this utility model provides a traction device, including a base frame, a lifting cylinder, a moving arm, a rotating arm, a swing arm cylinder, and a swing arm. One end of the lifting cylinder is hinged to one end of the base frame, one end of the moving arm is hinged to the other end of the base frame, one end of the swing arm is hinged to the other end of the moving arm, and the other end of the swing arm has a hook for hooking a box. The two ends of the swing arm cylinder are respectively hinged to the moving arm and the swing arm.

[0038] The lifting cylinder and the swing arm cylinder are driven by the cylinder drive follow-up system described in any of the foregoing embodiments.

[0039] In an optional embodiment, the traction device further includes a locking mechanism, which includes a lock cylinder and a locking rod. The lock cylinder is fixed to the swing arm, and the locking rod is used to open or close the hook opening of the hook body under the drive of the lock cylinder.

[0040] And / or,

[0041] The movable arm includes a lifting arm and a swing arm. One end of the swing arm is hinged to the base frame and is provided with guide rollers. The other end of the swing arm is hinged to one end of the lifting arm. One end of the swing arm is hinged to the other end of the lifting arm. The lifting cylinder is hinged to the middle of the lifting arm.

[0042] Thirdly, this utility model provides a garbage truck, including the hydraulic cylinder drive follow-up system described in any of the foregoing embodiments and the traction device described in the foregoing embodiments.

[0043] The beneficial effects of the embodiments of this application include, for example:

[0044] During box-pulling or unloading operations, the lifting cylinder can be extended or retracted via the lifting directional valve to drive the boom. During the boom's movement, the swing arm directional valve connects both the rod-side and rodless sides of the swing arm cylinder to the return oil line. This allows the piston rod of the swing arm cylinder to automatically retract or extend due to pressure or tension at both ends. The swing arm then rotates inward or outward in response to the boom's movement, achieving a synchronized motion effect. This system is simple to operate, safe, reliable, and prevents damage to the boom system structure, resulting in a long equipment lifespan. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0046] Figure 1 This is one of the operational schematic diagrams of the garbage truck according to an embodiment of this application;

[0047] Figure 2 This is the second schematic diagram of the operation of the garbage truck according to an embodiment of this application;

[0048] Figure 3 for Figure 1 Schematic diagram of the traction device;

[0049] Figure 4 for Figure 2 Schematic diagram of the traction device;

[0050] Figure 5 for Figure 3 and Figure 4 A schematic diagram of the combined structure of the swing arm and locking mechanism;

[0051] Figure 6 This is a hydraulic schematic diagram of the cylinder-driven follow-up system according to an embodiment of this application;

[0052] Figure 7 for Figure 6 A schematic diagram of the symbol for the central swing arm directional valve in its first state;

[0053] Figure 8 for Figure 6 A schematic diagram of the symbol for the middle swing arm reversing valve in its second state;

[0054] Figure 9 for Figure 6A schematic diagram of the symbol for the middle swing arm directional valve in its third state;

[0055] Figure 10 for Figure 6 A schematic diagram of the symbol for the lifting directional valve in its first state;

[0056] Figure 11 for Figure 6 A schematic diagram of the symbol for the lifting directional valve in its second state;

[0057] Figure 12 for Figure 6 A schematic diagram of the symbol for the lifting directional valve in its third state.

[0058] Icons: 100-Traction device; 110-Base frame; 111-Lifting cylinder shaft; 112-Rear frame rotating shaft; 113-Guide roller; 120-Lifting arm; 121-Middle frame cylinder shaft; 122-Middle frame rotating shaft; 123-Front frame rotating shaft; 124-Swing arm cylinder shaft; 130-Swing arm; 131-Hook body; 132-Front frame cylinder shaft; 140-Rotating arm; 150-Lifting cylinder; 160-Swing arm cylinder; 170-Locking box cylinder; 171-Locking rod; 180-Moving arm; 300-Cylinder drive follow-up system; 310-Oil inlet pipe; 311-Oil inlet pipe; 314-Oil pump; 31 5-Power Take-Off; 320-Return Oil Line; 321-Return Oil Line; 322-Relief Valve; 323-Return Oil Check Valve; 330-Swing Arm Directional Valve; 340-Lift Directional Valve; 350-Swing Arm Solenoid Valve; 360-Throttle Valve; 370-First Swing Arm Oil Circuit; 371-Second Swing Arm Oil Circuit; 373-Pressure Regulating Valve; 380-First Lifting Oil Circuit; 381-Second Lifting Oil Circuit; 382-Valve Preset Interface; 383-Balance Valve Assembly; 384-Lifting Solenoid Valve; 390-Swing Arm Check Valve; 391-Lifting Check Valve; 393-Oil Tank; 500-Chassis; 700-Box; 710-Crossbeam. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0060] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0061] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0062] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0063] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0064] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0065] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0066] This application discloses a traction device 100, which is applied to a garbage truck and is mainly used for loading and unloading the container 700.

[0067] refer to Figures 1 to 4The traction device 100 includes a base frame 110, a lifting cylinder 150, a moving arm 180, a swing arm cylinder 160, and a swing arm 130. One end of the lifting cylinder 150 is hinged to one end of the base frame 110, and one end of the moving arm 180 is hinged to one end of the base frame 110. The base frame 110 is used to fix it on the chassis 500 of the garbage truck. One end of the swing arm 130 is hinged to the other end of the moving arm 180. The other end of the swing arm 130 has a hook 131 for hooking the bottom crossbeam 710 of the container 700. The two ends of the swing arm cylinder 160 are respectively hinged to the moving arm 180 and the swing arm 130.

[0068] The mobile arm 180 includes a lifting arm 120 and a swing arm 140. One end of the swing arm 140 is hinged to the base frame 110 and is equipped with a guide roller 113. The other end of the swing arm 140 is hinged to one end of the lifting arm 120, and the other end of the lifting arm 120 is hinged to one end of the swing arm 130. In this way, the lifting arm 120 is indirectly hinged to the base frame 110 through the swing arm 140. At the same time, the segmented hinge structure can also increase the flexibility of the entire mobile arm 180.

[0069] In detail, the lifting cylinder 150 is hinged to the front end of the base frame 110 via the lifting cylinder shaft 111, and the piston rod of the lifting cylinder 150 is hinged to the middle part of the lifting arm 120 via the middle frame cylinder shaft 121.

[0070] One end of the swing arm 140 is hinged to the rear end of the base frame 110 via the rear frame rotation shaft 112, and the other end of the swing arm 140 is hinged to one end of the lifting arm 120 via the middle frame rotation shaft 122.

[0071] One end of the swing arm 130 is hinged to the other end of the lifting arm 120 via the front frame rotation shaft 123.

[0072] One end of the swing arm cylinder 160 is hinged to the lifting arm 120 via the swing arm cylinder shaft 124 at a position between the front frame rotation shaft 123 and the lifting cylinder shaft 111, while the other end of the swing arm cylinder 160 is hinged to the middle part of the swing arm 130 via the front frame cylinder shaft 132.

[0073] refer to Figure 5 In this embodiment, the traction device 100 also includes a locking mechanism, which includes a locking cylinder 170 and a locking rod 171. The fixed end of the locking cylinder 170 is fixedly connected to the swing arm 130, and the free end of the locking cylinder 170 is connected to the locking rod 171. The locking rod 171 is used to open or close the hook opening of the hook body 131 under the drive of the locking cylinder 170. In this way, the extension of the locking cylinder 170 can ensure a reliable connection between the hook body 131 and the bottom crossbeam 710 of the box body 700, preventing loosening. When the locking cylinder 170 is shortened, the crossbeam 710 can be disengaged from the hook opening of the hook body 131, which is convenient for unlocking and also convenient for switching between pulling and unloading the box.

[0074] refer to Figure 6 This embodiment also discloses a hydraulic cylinder drive follow-up system 300, which is mainly used to drive the above-mentioned lifting hydraulic cylinder 150 and swing arm hydraulic cylinder 160.

[0075] The hydraulic cylinder drive follow-up system 300 includes an oil inlet line 310, a lifting directional valve 340, a swing arm directional valve 330, and a return line 320.

[0076] Both the lifting directional valve 340 and the swing arm directional valve 330 are connected between the oil inlet line 310 and the oil return line 320.

[0077] The lifting directional valve 340 is used to connect the rod chamber and the rodless chamber of the lifting cylinder 150, and can connect one of the rod chamber and the rodless chamber of the lifting cylinder 150 to the oil inlet line 310 and the other to the oil return line 320.

[0078] The swing arm reversing valve 330 is used to connect the rod chamber and the rodless chamber of the swing arm cylinder 160, and can make one of the rod chamber and the rodless chamber of the swing arm cylinder 160 connected to the oil inlet line 310 and the other connected to the oil return line 320.

[0079] When the lifting directional valve 340 connects the rodless or rod chamber of the lifting cylinder 150 to the oil inlet line 310, the swing arm directional valve 330 can also connect both the rod chamber and the rodless chamber of the swing arm cylinder 160 to the return line 320.

[0080] As described above, during box pulling or unloading operations, the lifting cylinder 150 can be extended or retracted via the lifting directional valve 340 to drive the moving arm. During the movement of the moving arm, the rod-side and rodless chambers of the swing arm cylinder 160 can be connected to the return oil line 320 via the swing arm directional valve 330. Thus, the rod-side and rodless chambers of the swing arm cylinder 160 can be interconnected via the swing arm directional valve 330, causing the piston rod of the swing arm cylinder 160 to automatically retract or extend due to the pressure or tension at both ends. The swing arm 130 will then rotate inward or outward in response to the movement of the moving arm, achieving a follow-up effect where the swing arm 130 moves with the movement of the moving arm. This is simple to operate, safe and reliable, and can prevent damage to the structure of the lifting arm system (i.e., prevent damage caused by abnormal force on the moving arm and swing arm 130), extending the service life of the equipment.

[0081] In addition, when it is necessary to extend the swing arm 130 to hook onto the housing 700 or fold it away from the housing 700, the swing arm cylinder 160 can also be extended and retracted through the swing arm reversing valve 330. Therefore, the extension or folding action of the swing arm 130 can be controlled independently, which makes it convenient to lock and unlock the housing 700 by operating the swing arm 130 alone after the lifting cylinder 150 has extended and retracted to the position.

[0082] Optional, combined Figures 7 to 9 The rocker arm directional valve 330 is a Y-type directional valve with a P1 port, a T1 port, an A1 port and a B1 port; the P1 port is connected to the oil inlet line 310, the T1 port is connected to the oil return line 320, and the A1 port and the B1 port are used to connect the rodless chamber and the rod chamber of the rocker arm cylinder 160, respectively.

[0083] When the swing arm reversing valve 330 is in the first state, port P1 and port A1 are connected, and port B1 and port T1 are connected. At this time, the oil inlet pipe 310 is connected to the rodless chamber of the swing arm cylinder 160, and the rod chamber of the swing arm cylinder 160 is connected to the return oil pipe 320. The oil pressure in the rodless chamber of the swing arm cylinder 160 is greater than the oil pressure in the rod chamber, so the swing arm cylinder 160 extends, thereby realizing the rotational action of the swing arm 130 relative to the lifting arm 120 to extend outward, so that the hook 131 moves upward to hook the crossbeam 710 at the bottom of the box 700.

[0084] When the swing arm reversing valve 330 is in the second state, port P1 is blocked, and ports A1 and B1 are connected to port T1. At this time, the oil inlet line 310 is blocked from both the rod chamber and the rodless chamber of the swing arm cylinder 160, and both the rod chamber and the rodless chamber of the swing arm cylinder 160 are connected to the return line 320. Hydraulic oil can flow between the rod chamber and the rodless chamber of the swing arm cylinder 160, and the swing arm 130 can move with the moving arm.

[0085] When the swing arm reversing valve 330 is in the third state, port P1 is connected to port B1, and port A1 is connected to port T1. At this time, the oil inlet pipe 310 is connected to the rod chamber of the swing arm cylinder 160, and the oil return pipe 320 is connected to the rodless chamber of the swing arm cylinder 160. The oil pressure in the rod chamber of the swing arm cylinder 160 is greater than the oil pressure in the rodless chamber, so the swing arm cylinder 160 is shortened, thereby realizing the rotational action of the swing arm 130 folding inward relative to the lifting arm 120, so that the hook 131 moves downward and separates from the crossbeam 710 at the bottom of the box 700.

[0086] In detail, the swing arm directional valve 330 is a Y-type three-position six-way directional valve, which also has a P3 port and a T3 port. The P3 port is connected to the oil inlet line 310, and the T3 port is connected to the oil return line 320.

[0087] When the swing arm reversing valve 330 is in the first or third state, the P3 port and T3 port are blocked to increase the hydraulic oil pressure in the rodless or rod chamber of the swing arm cylinder 160 through the oil inlet line 310.

[0088] When the swing arm reversing valve 330 is in the second state, the P3 port and the T3 port are connected so that the hydraulic oil in the oil inlet pipe 310 can return directly to the oil tank 393 without affecting the circulation of the hydraulic oil.

[0089] Of course, it's understandable that the rocker arm cylinder 160 and the rocker arm directional valve 330 are connected by a pipeline. (Continue to refer to...) Figure 6 The rodless chamber of the rocker arm cylinder 160 and the A1 port of the rocker arm reversing valve 330 are connected by a first rocker arm oil circuit 370, and the rod chamber of the rocker arm cylinder 160 and the B1 port of the rocker arm reversing valve 330 are connected by a second rocker arm oil circuit 371.

[0090] In addition, the first swing arm oil circuit 370 and the second swing arm oil circuit 371 can each be extended by an additional swing arm branch pipe oil circuit to connect to the return oil circuit 320. Pressure regulating valves 373 are installed on these two swing arm branch pipe oil circuits to regulate the oil pressure of the swing arm cylinder 160.

[0091] The hydraulic cylinder drive follow-up system 300 also includes an openable or closed swing arm solenoid valve 350 and / or an adjustable throttle valve 360, which are connected between the swing arm directional valve 330 and the swing arm cylinder 160. Specifically, a throttle valve 360 ​​and a swing arm solenoid valve 350 are provided on both the first swing arm oil passage 370 and the second swing arm oil passage 371.

[0092] By setting the throttle valve 360, the extension and retraction speed of the rocker arm cylinder 160 can be adjusted when both the rod chamber and the rodless chamber of the rocker arm cylinder 160 are connected to the return oil line 320, so that the rocker arm 130 moves accordingly.

[0093] By setting the swing arm solenoid valve 350, the swing arm solenoid valve 350 can be closed to lock the oil circuit of the swing arm cylinder 160, preventing the swing arm cylinder 160 from extending or retracting arbitrarily and ensuring safety. Only when the swing arm solenoid valve 350 is open can the swing arm directional valve 330 connect the rodless or rod chamber of the swing arm cylinder 160 to the oil inlet pipe 310 to achieve a follow-up effect. That is to say, when the lifting directional valve 340 is in the first or third state, connecting the rodless or rod chamber of the lifting cylinder 150 to the oil inlet pipe 310, and the swing arm solenoid valve 350 is open, the swing arm directional valve 330 can connect both the rodless and rod chambers of the swing arm cylinder 160 to the return oil pipe 320, realizing the follow-up movement of the swing arm cylinder 160 and the lifting cylinder 150. In other words, when the lifting directional valve 340 is in the first or third state, the swing arm solenoid valve 350 is energized and turned on, so that the first swing arm oil circuit 370 is connected to the rodless chamber of the swing arm cylinder 160, and the second swing arm oil circuit 371 is connected to the rod chamber of the swing arm cylinder 160. At this time, the swing arm directional valve 330 switches to the second state, so that the first swing arm oil circuit 370 and the second swing arm oil circuit 371 are connected through the return oil line 320, thereby realizing the connection between the rod chamber and the rodless chamber oil circuit of the swing arm directional valve 330, and thus realizing the follow-up effect of the two ends of the swing cylinder 160 extending and retracting in response to the force when the lifting cylinder 150 is activated.

[0094] Combination Figures 10 to 12 The lifting directional valve 340 is a Y-type directional valve with P2 port, T2 port, A2 port and B2 port; P2 port is connected to the oil inlet line 310, T2 port is connected to the oil return line 320, and A2 port and B2 port are used to connect the rodless chamber and rod chamber of the lifting cylinder 150 respectively.

[0095] When the lifting directional valve 340 is in the first state, port P2 is connected to port A2 and port B2 is connected to port T2. At this time, the rodless chamber of the lifting cylinder 150 is connected to the oil inlet pipe 310 and the rod chamber is connected to the oil return pipe 320. Thus, the oil pressure in the rodless chamber of the lifting cylinder 150 is greater than the oil pressure in the rod chamber, and the lifting cylinder 150 extends, thereby driving the lifting arm 120 to rotate and lift.

[0096] When the lifting directional valve 340 is in the second state, port P2 is blocked, and ports A2 and B2 are connected to port T2. At this time, the rodless chamber and rod chamber of the lifting cylinder 150 are connected to the return oil line 320, and hydraulic oil can flow between the rod chamber and rodless chamber of the swing arm cylinder 160. Thus, at the end of the box-pulling operation (the process when the box 700 is about to be completely flattened), the lifting arm 120 shortens the lifting cylinder 150 under the pressure of the box 700 until the lifting arm 120 is completely flattened, which plays a buffering role.

[0097] When the lifting directional valve 340 is in the third state, port P2 is connected to port B2, and port A2 is connected to port T2. At this time, the rod chamber of the lifting cylinder 150 is connected to the oil inlet pipe 310, and the rodless chamber is connected to the oil return pipe 320. As a result, the oil pressure in the rod chamber of the lifting cylinder 150 is greater than the oil pressure in the rodless chamber, and the lifting cylinder 150 shortens, thereby driving the lifting arm 120 to rotate and gradually lower and level itself.

[0098] The lifting directional valve 340 is a Y-type three-position six-way directional valve, and also has a P4 port and a T4 port. The P4 port is connected to the oil inlet line 310, and the T4 port is connected to the oil return line 320.

[0099] When the lifting directional valve 340 is in the first or third state, ports P4 and T4 are blocked to increase the hydraulic oil pressure in the rodless or rod chamber of the lifting cylinder 150 supplied by the oil inlet line 310.

[0100] When the lifting directional valve 340 is in the second state, ports P4 and T4 are connected so that the hydraulic oil in the inlet line 310 returns directly to the oil tank 393 without affecting the circulation of the hydraulic oil.

[0101] Furthermore, since both the lifting directional valve 340 and the swing arm directional valve 330 are Y-type three-position six-way valves, the inlet line 310 can be directly connected to the P3 port of the swing arm directional valve 330, the T3 port of the swing arm directional valve 330 can be connected to the P4 port of the lifting directional valve 340, and the T4 port of the lifting directional valve 340 can be connected to the return line 320; alternatively, the inlet line 310 can be directly connected to the P4 port of the lifting directional valve 340, the T4 port of the lifting directional valve 340 can be connected to the P3 port of the swing arm directional valve 330, and the T3 port of the swing arm directional valve 330 can be connected to the return line 320. This reduces the complexity of the hydraulic system's piping.

[0102] It should be noted that in some embodiments, the buffer function before the housing 700 is about to be flattened may not be required, and the lifting directional valve 340 may also be other types of valves, such as O-type directional valves.

[0103] Of course, it's understandable that the lifting cylinder 150 and the lifting directional valve 340 are connected by a pipeline. (Continue to refer to...) Figure 6 The rodless chamber of the lifting cylinder 150 and the A2 port of the lifting directional valve 340 are connected by a first lifting oil circuit 380, and the rod chamber of the lifting cylinder 150 and the B2 port of the lifting directional valve 340 are connected by a second lifting oil circuit 381.

[0104] In addition, the first lifting oil circuit 380 and the second lifting oil circuit 381 can each be extended by an additional lifting branch oil circuit to connect to the return oil circuit 320. A valve preset interface 382 is set on these two lifting branch oil circuits as a backup. Various functional valves can be installed on the valve preset interface 382 as needed, and the lifting branch oil circuit can be blocked to prevent oil from flowing when not needed.

[0105] The hydraulic cylinder drive follow-up system 300 also includes a balance valve assembly 383 and / or a lift solenoid valve 384 that can be opened or closed. The balance valve assembly 383 is connected between the lift cylinder 150 and the lift directional valve 340, and the lift solenoid valve 384 is connected between the rodless chamber of the lift cylinder 150 and the lift directional valve 340.

[0106] Specifically, the balance valve assembly 383 is connected in series in the first lifting oil circuit 380 and the second lifting oil circuit 381 to maintain stable oil pressure and flow.

[0107] The lifting solenoid valve 384 is connected in series in the first lifting oil circuit 380 and in parallel with the balance valve group 383. Opening the lifting solenoid valve 384 slows down the retraction rate of the lifting cylinder 150 under pressure from the housing 700. In other words, when the lifting solenoid valve 384 is open, the lifting directional valve 340 connects both the rod-side and rodless sides of the lifting cylinder 150 to the return oil line 320, thus allowing the lifting cylinder 150 to retract slowly under pressure. Alternatively, when the lifting solenoid valve 384 is energized and open, the lifting directional valve 340 switches to a second state, where the housing 700, under its own weight, presses against the moving arm. This causes the lifting cylinder 150 to retract slowly under external pressure, and the housing 700 descends slowly, achieving a buffering effect.

[0108] The oil inlet pipeline 310 includes an oil inlet pipe 311 and an oil pump 314 installed in the oil inlet pipe 311. The inlet of the oil inlet pipe 311 is connected to the oil tank 393.

[0109] The return oil line 320 includes a return oil pipe 321 and an overflow valve 322 installed on the return oil pipe 321. The inlet of the return oil pipe 321 is connected to the inlet oil pipe 311, and the outlet of the return oil pipe 321 is connected to the oil tank 393.

[0110] The P4 port of the lifting directional valve 340 is connected to the oil inlet pipe 311, the T4 port of the lifting directional valve 340 is connected to the P3 port of the swing arm directional valve 330, and the T3 port of the swing arm directional valve 330 is connected to the return oil pipe 321.

[0111] The P1 port of the swing arm directional valve 330 and the P2 port of the lifting directional valve 340 are both connected to the oil inlet pipe 311. The T1 port of the swing arm directional valve 330 and the T2 port of the lifting directional valve 340 are both connected to the oil return pipe 321.

[0112] The oil pump 314 circulates hydraulic oil during operation. The power for the oil pump 314 can be provided by the garbage engine, for example, by transmitting engine power to the oil pump 314 via a power take-off unit 315 to drive its operation. A return oil check valve 323 is installed on the return oil pipe 321 to ensure one-way circulation of the oil circuit.

[0113] There is a swing arm check valve 390 between the P1 port of the swing arm reversing valve 330 and the oil inlet pipe 311 of the oil inlet line 310, and there is a lifting check valve 391 between the P2 port of the lifting reversing valve 340 and the oil inlet pipe 311 of the oil inlet line 310, so as to ensure the one-way flow of hydraulic oil.

[0114] Understandably, the operator can control the various valves in the 314 oil pump drive system by pressing various buttons on the control box. The control box is electrically connected to the electronic control system. The user commands received by the control box are transmitted to the electronic control system, which then controls the corresponding valves.

[0115] The working principle of the oil pump 314 drive system driving the traction device 100 in this embodiment will be described by way of example:

[0116] (1) Luggage pulling operation

[0117] During the docking process with the container 700, the vehicle reverses and approaches the container 700, and the guide roller 113 contacts the bottom track of the container 700. The lifting cylinder 150 lifts to a certain angle, and the lifting arm 120 is in the lifting state. Press and hold the "swing arm 130 lift" button on the control box, and the electronic control system controls the swing arm reversing valve 330 to be in the first state. The swing arm cylinder 160 extends to drive the swing arm to swing backward and upward until the hook 131 hooks the crossbeam 710 at the bottom of the container 700. Then, the piston rod of the locking cylinder 170 extends to drive the locking rod 171 to lock the crossbeam 710 of the container 700, completing the preparation before pulling the container.

[0118] During the box-pulling process, the "Main Arm Lowering" button on the control box is pressed. The electrical control system controls the lifting directional valve 340 to be in the third state, and the lifting cylinder 150 is shortened. At the same time, the electrical control system controls the swing arm solenoid valve 350 to open, and the swing arm directional valve 330 is in the second state. At this time, the rod chamber and rodless chamber of the swing arm cylinder 160 are connected through the swing arm directional valve 330. When pulling the box, the swing arm cylinder 160 is subjected to external force (compression at both ends of the cylinder). The oil in the rod chamber and the oil in the rodless chamber can flow to each other through ports B1 and A1, thereby realizing the movement of the swing arm 130 with the lifting arm 120. The lifting cylinder 150 continues to retract, and the lifting arm 120 and the box 700 are leveled.

[0119] (2) Unpacking operation

[0120] The unloading process is the reverse of the lifting process. The operator presses the "Main Arm Lift" button on the control box. The electrical control system controls the lifting directional valve 340 to be in its first state, extending the lifting cylinder 150 to drive the lifting arm 120 to lift. Simultaneously, the electrical control system controls the swing arm solenoid valve 350 in the cylinder's oil circuit to open, putting the swing arm directional valve 330 in its second state. At this time, the rod chamber and rodless chamber of the swing arm cylinder 160 are connected. During unloading, the swing arm cylinder 160 is subjected to external force (tension at both ends of the cylinder). The oil in the rod chamber and the rodless chamber can flow between each other through ports B1 and A1, thus enabling the swing arm 130 to move with the lifting arm 120. The lifting cylinder 150 continues to extend, and the container 700 is placed vertically.

[0121] In the final stage of the unloading process (the reverse process of docking container 700), after container 700 is placed vertically and leveled, lifting cylinder 150 remains stationary, locking cylinder 170 retracts, and corresponding locking rod 171 retracts. Press and hold the "swing arm 130 lower" button on the control box, and the electronic control system controls the swing arm reversing valve 330 to the third state. At the same time, swing arm solenoid valve 350 opens, swing arm cylinder 160 retracts, swing arm 130 swings backward and downward to retract, lifting cylinder 150 retracts, and lifting arm 120 swings forward to the horizontal.

[0122] In addition, this application also discloses a garbage truck, which includes the cylinder-driven follow-up system 300 and the traction device 100 described in the above embodiments.

[0123] In summary, the embodiments of this application disclose a hydraulic cylinder-driven follow-up system 300, a traction device 100, and a garbage truck, which have at least the following advantages compared to the prior art:

[0124] 1. This solution is easy to operate. During the process of pulling or unloading the container, the driver only needs to operate one button to complete the action of pulling or unloading the container, which avoids the need for the driver to repeatedly operate two buttons (one is the lifting button and the other is the extension or swing button) in the existing technology, thereby reducing the difficulty and intensity of the driver's operation.

[0125] 2. Due to the application of follow-up technology, the structural components of the boom system (mainly the lifting boom 120 and the swing arm 130) are protected from stress. The structural components will not be damaged due to abnormal stress caused by driver operation errors, thus extending their service life and ensuring safety and reliability.

[0126] 3. The design of the superstructure in this solution is lightweight, resulting in a lighter overall vehicle weight and increased rated load capacity, allowing for the loading of more goods and reducing operating costs.

[0127] Finally, it should be noted that in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0128] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A hydraulic cylinder-driven follow-up system for a traction device (100), characterized in that, The traction device (100) includes a base frame (110), a lifting cylinder (150), a moving arm (180), a swing arm cylinder (160), and a swing arm (130). One end of the lifting cylinder (150) is hinged to one end of the base frame (110), and the other end of the lifting cylinder (150) is hinged to the middle of the moving arm (180). One end of the moving arm (180) is hinged to the other end of the base frame (110), and one end of the swing arm (130) is hinged to the other end of the moving arm (180). The other end of the swing arm (130) has a hook (131) for hooking the box (700). The two ends of the swing arm cylinder (160) are respectively hinged to the moving arm (180) and the swing arm (130). The cylinder drive follow-up system (300) includes an oil inlet line (310), a lifting directional valve (340), a swing arm directional valve (330), and a return line (320); The lifting directional valve (340) and the swing arm directional valve (330) are both connected between the oil inlet line (310) and the oil return line (320); The lifting directional valve (340) enables one of the rod chamber and the rodless chamber of the lifting cylinder (150) to be connected to the oil inlet line (310), and the other to be connected to the oil return line (320). The swing arm reversing valve (330) enables one of the rod chamber and the rodless chamber of the swing arm cylinder (160) to be connected to the oil inlet line (310), and the other to be connected to the oil return line (320). When the lifting reversing valve (340) connects the rodless or rod chamber of the lifting cylinder (150) to the oil inlet line (310), the swing arm reversing valve (330) can also connect both the rod chamber and the rodless chamber of the swing arm cylinder (160) to the oil return line (320).

2. The hydraulic cylinder drive follow-up system according to claim 1, characterized in that, The swing arm reversing valve (330) is a Y-type reversing valve with a P1 port, a T1 port, an A1 port and a B1 port; the P1 port is connected to the oil inlet line (310), the T1 port is connected to the oil return line (320), and the A1 port and the B1 port are respectively used to connect the rodless chamber and the rod chamber of the swing arm cylinder (160); When the swing arm reversing valve (330) is in the first state, the P1 port and the A1 port are connected, and the B1 port and the T1 port are connected; When the swing arm reversing valve (330) is in the second state, the P1 port is blocked, and both the A1 port and the B1 port are connected to the T1 port; When the swing arm reversing valve (330) is in the third state, the P1 port is connected to the B1 port, and the A1 port is connected to the T1 port.

3. The hydraulic cylinder drive follow-up system according to claim 2, characterized in that, The swing arm reversing valve (330) is a Y-type three-position six-way reversing valve, and also has a P3 port and a T3 port. The P3 port is connected to the oil inlet pipeline (310), and the T3 port is connected to the oil return pipeline (320). When the swing arm reversing valve (330) is in the first state or the third state, the P3 port and the T3 port are blocked; When the swing arm reversing valve (330) is in the second state, the P3 port and the T3 port are connected.

4. The hydraulic cylinder drive follow-up system according to claim 1, characterized in that, The lifting directional valve (340) has a P2 port, a T2 port, an A2 port and a B2 port; the P2 port is connected to the oil inlet line (310), the T2 port is connected to the oil return line (320), and the A2 port and the B2 port are respectively used to connect the rodless chamber and the rod chamber of the lifting cylinder (150); When the lifting reversing valve (340) is in the first state, the P2 port is connected to the A2 port, and the B2 port is connected to the T2 port; When the lifting reversing valve (340) is in the third state, the P2 port is connected to the B2 port, and the A2 port is connected to the T2 port.

5. The hydraulic cylinder drive follow-up system according to claim 4, characterized in that, The lifting directional valve (340) is a Y-type valve. When the lifting directional valve (340) is in the second state, the P2 port is blocked, and the A2 port and the B2 port are both connected to the T2 port. And / or, The lifting directional valve (340) is a Y-type three-position six-way directional valve, and also has a P4 port and a T4 port. The P4 port is connected to the oil inlet line (310), and the T4 port is connected to the oil return line (320). When the lifting reversing valve (340) is in the first state or the third state, the P4 port and the T4 port are blocked; When the lifting directional valve (340) is in the second state, the P4 port and the T4 port are connected.

6. The hydraulic cylinder drive follow-up system according to claim 1, characterized in that, The hydraulic cylinder drive follow-up system (300) also includes an openable or closed swing arm solenoid valve (350) and / or an adjustable throttle valve (360), wherein the swing arm solenoid valve (350) and / or the throttle valve (360) are connected between the swing arm reversing valve (330) and the swing arm cylinder (160). When the lifting directional valve (340) connects the rodless or rod chamber of the lifting cylinder (150) to the oil inlet line (310) and the swing arm solenoid valve (350) is opened, the swing arm directional valve (330) can connect both the rodless and rod chambers of the swing arm cylinder (160) to the return line (320).

7. The hydraulic cylinder drive follow-up system according to claim 6, characterized in that, The swing arm reversing valve (330) is a Y-type reversing valve with a P1 port, a T1 port, an A1 port and a B1 port; the P1 port is connected to the oil inlet line (310), the T1 port is connected to the oil return line (320), and the A1 port and the B1 port are respectively used to connect the rodless chamber and the rod chamber of the swing arm cylinder (160); The lifting directional valve (340) has a P2 port, a T2 port, an A2 port and a B2 port; the P2 port is connected to the oil inlet line (310), the T2 port is connected to the oil return line (320), and the A2 port and the B2 port are respectively used to connect the rodless chamber and the rod chamber of the lifting cylinder (150); When the lifting reversing valve (340) is in the first state, the P2 port is connected to the A2 port, and the B2 port is connected to the T2 port; When the lifting reversing valve (340) is in the third state, the P2 port is connected to the B2 port, and the A2 port is connected to the T2 port; When the lifting reversing valve (340) is in the first or third state and the swing arm solenoid valve (350) is open, the swing arm reversing valve (330) can switch to the second state so that the P1 port is blocked and the A1 port and the B1 port are both connected to the T1 port.

8. The hydraulic cylinder drive follow-up system according to claim 1, 4 or 5, characterized in that, The cylinder drive follow-up system also includes a balance valve assembly (383) and / or an openable or closeable lifting solenoid valve (384). The balance valve assembly (383) is connected between the lifting cylinder (150) and the lifting directional valve (340). The lifting solenoid valve (384) is connected between the rodless chamber of the lifting cylinder (150) and the lifting directional valve (340). When the lifting solenoid valve (384) is open, the lifting directional valve (340) can connect both the rod chamber and the rodless chamber of the lifting cylinder (150) to the return oil line (320).

9. A traction device, characterized in that, The system includes a base frame (110), a lifting cylinder (150), a moving arm (180), a swing arm cylinder (160), and a swing arm (130). One end of the lifting cylinder (150) is hinged to one end of the base frame (110), and the other end of the lifting cylinder (150) is hinged to the middle of the moving arm (180). One end of the moving arm (180) is hinged to the other end of the base frame (110), and one end of the swing arm (130) is hinged to the other end of the moving arm (180). The other end of the swing arm (130) has a hook (131) for hooking the box body (700). The two ends of the swing arm cylinder (160) are respectively hinged to the moving arm (180) and the swing arm (130). The lifting cylinder (150) and the swing arm cylinder (160) are driven by the cylinder drive follow-up system (300) according to any one of claims 1-8.

10. The traction device according to claim 9, characterized in that, The traction device (100) also includes a locking mechanism, which includes a lock cylinder (170) and a locking rod (171). The fixed end of the lock cylinder (170) is fixedly connected to the swing arm (130), and the free end of the lock cylinder (170) is connected to the locking rod (171). The locking rod (171) is used to open or close the hook opening of the hook body (131) under the drive of the lock cylinder (170). And / or, The movable arm (180) includes a lifting arm (120) and a rotating arm (140). One end of the rotating arm (140) is hinged to the base frame (110) and is provided with a guide roller (113). The other end of the rotating arm (140) is hinged to one end of the lifting arm (120). One end of the swing arm (130) is hinged to the other end of the lifting arm (120). The lifting cylinder (150) is hinged to the middle of the lifting arm (120).

11. A garbage truck, characterized in that, It includes the hydraulic cylinder drive follow-up system (300) as described in any one of claims 1-8 and the traction device (100) as described in claim 8 or 9.

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