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 technical field of sanitation equipment, and in particular, to an oil cylinder drive follow-up system, a traction device, and a garbage truck. Background Art

[0002] A garbage truck, also known as a garbage collection vehicle or waste collection vehicle, is a vehicle specifically designed for collecting and transporting solid waste in urban and rural areas. These vehicles are crucial for maintaining environmental cleanliness and public hygiene.

[0003] In existing split-type garbage compression stations, there are horizontal and vertical compression placement modes, and the proportion of the vertical station mode in the past two years has exceeded 30%; the garbage bins of the vertical stations are placed vertically, and the existing supporting vehicles in the industry include pull-arm type, wire rope type, and corner fitting type. The pull-arm type vehicle supporting the vertical station has become the main vehicle mode for supporting the vertical station due to its high safety and reliability and light vehicle weight.

[0004] The hook-arm type garbage truck mainly controls the pull arm through a hydraulic system to complete the loading, unloading, transportation, and dumping of the garbage bin. However, in the current hook-arm type garbage truck, the operations of pulling the bin and unloading the bin are complicated. If the operation is improper, it is easy to cause abnormal stress on the structural parts and damage the structural parts, reducing the service life of the pull arm system. Moreover, the complicated operations are prone to errors by the operators, posing a safety hazard. Summary of the Invention

[0005] The purpose of this application is to provide an oil cylinder drive follow-up system, a traction device, and a garbage truck, which are simple and easy to operate, safe and reliable, and can prevent damage to the structure of the pull arm system, and have a long service life of the equipment.

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

[0007] In a first aspect, the present invention provides an oil cylinder drive follow-up system for a traction device. The traction device includes a chassis, a lifting oil cylinder, a moving arm, a rotating arm, a swing arm oil cylinder, and a swing arm. The two ends of the lifting oil cylinder are respectively hinged to the chassis and the moving arm. One end of the lifting oil cylinder is hinged to one end of the chassis, and the other end of the lifting oil cylinder is hinged to the middle of the moving arm. One end of the moving arm is hinged to the other end of the chassis. 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 body for hooking the box body. The two ends of the swing arm oil cylinder are respectively hinged to the moving arm and the swing arm;

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

[0009] Both the lifting reversing valve and the swing arm reversing valve are connected between the oil inlet pipeline and the oil return pipeline;

[0010] The lift reversing valve can conduct one of the rod chamber and the rodless chamber of the lift cylinder to the oil inlet pipeline, and the other to the oil return pipeline;

[0011] The swing arm reversing valve can conduct one of the rod chamber and the rodless chamber of the swing arm cylinder to the oil inlet pipeline, and the other to the oil return pipeline;

[0012] Wherein, when the lift reversing valve conducts the rodless chamber or the rod chamber of the lift cylinder to the oil inlet pipeline, the swing arm reversing valve can also conduct both the rod chamber and the rodless chamber of the swing arm cylinder to the oil return pipeline.

[0013] In an alternative embodiment, the swing 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 pipeline, the T1 port is connected to the oil return pipeline, 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;

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

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

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

[0017] In an alternative embodiment, the swing arm reversing valve is a Y-type three-position six-way reversing valve, further having 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 state or the 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 conducted.

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

[0021] When the lift reversing valve is in the first state, the P2 port and the A2 port are conducted, and the B2 port and the T2 port are conducted;

[0022] When the lift reversing valve is in the third state, the P2 port is in communication with the B2 port, and the A2 port is in communication with the T2 port.

[0023] In an alternative embodiment, the lift reversing valve is a Y-type reversing valve. When the lift reversing valve is in the second state, the P2 port is blocked, and both the A2 port and the B2 port are in communication with the T2 port;

[0024] and / or

[0025] The lift reversing valve is a Y-type three-position six-way reversing valve, and further has a P4 port and a T4 port. The P4 port is connected to the oil inlet pipeline, and the T4 port is connected to the oil return pipeline;

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

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

[0028] In an alternative embodiment, the swing cylinder drive follow-up system further includes an openable or closable swing arm solenoid valve and / or a throttle valve with adjustable opening degree. 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 lift reversing valve conducts the rodless cavity or the rod cavity of the lift cylinder to the oil inlet pipeline, and the swing arm solenoid valve is opened, the swing arm reversing valve can make both the rod cavity and the rodless cavity of the swing arm cylinder in communication with the oil return pipeline.

[0030] In an alternative embodiment, the swing 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 pipeline, the T1 port is connected to the oil return pipeline, and the A1 port and the B1 port are respectively used to connect the rodless cavity and the rod cavity of the swing arm cylinder;

[0031] The lift reversing valve has a P2 port, a T2 port, an A2 port, and a B2 port; the P2 port is connected to the oil inlet pipeline, the T2 port is connected to the oil return pipeline, and the A2 port and the B2 port are respectively used to connect the rodless cavity and the rod cavity of the lift cylinder;

[0032] When the lift reversing valve is in the first state, the P2 port is in communication with the A2 port, and the B2 port is in communication with the T2 port;

[0033] When the lift reversing valve is in the third state, the P2 port is in communication with the B2 port, and the A2 port is in communication with the T2 port;

[0034] When the lift reversing valve is in the first state or the third state and the swing arm solenoid valve is open, the swing arm reversing valve can be switched to the second state so as to block the P1 port and conduct both the A1 port and the B1 port to the T1 port.

[0035] In an alternative embodiment, the oil cylinder drive follow-up system further includes a balance valve group and / or a lift solenoid valve that can be opened or closed. The balance valve group is connected between the lift oil cylinder and the lift reversing valve, and the lift solenoid valve is connected between the rodless chamber of the lift oil cylinder and the lift reversing valve;

[0036] When the lift solenoid valve is open, the lift reversing valve can conduct both the rod chamber and the rodless chamber of the lift oil cylinder to the oil return pipeline.

[0037] In a second aspect, the present invention provides a towing device, including a chassis, a lift oil cylinder, a moving arm, a rotating arm, a swing arm oil cylinder and a swing arm. One end of the lift oil cylinder is hinged to one end of the chassis, one end of the moving arm is hinged to the other end of the chassis, 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 body for hooking the box body, and both ends of the swing arm oil cylinder are respectively hinged to the moving arm and the swing arm;

[0038] Wherein, the lift oil cylinder and the swing arm oil cylinder are driven by the oil cylinder drive follow-up system according to any one of the foregoing embodiments.

[0039] In an alternative embodiment, the towing device further includes a locking mechanism, the locking mechanism includes a lock box oil cylinder and a lock rod. The lock box oil cylinder is fixed to the swing arm, and the lock rod is used to open or seal the hook opening of the hook body under the drive of the lock box oil cylinder;

[0040] and / or,

[0041] The moving arm includes a lift arm and a rotating arm. One end of the rotating arm is hinged to the chassis and is provided with a guide roller. The other end of the rotating arm is hinged to one end of the lift arm. One end of the swing arm is hinged to the other end of the lift arm, and the lift oil cylinder is hinged to the middle of the lift arm.

[0042] In a third aspect, the present invention provides a garbage truck, including the oil cylinder drive follow-up system according to any one of the foregoing embodiments and the towing device according to the foregoing embodiment.

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

[0044] During the operation of loading or unloading the box, the telescopic movement of the lifting oil cylinder can be achieved through the lifting directional valve to drive the movement of the moving arm. During the movement of the moving arm, both the rod chamber and the rodless chamber of the swing arm oil cylinder can be communicated with the oil return pipeline through the swing arm directional valve. In this way, the swing arm oil cylinder can achieve the intercommunication between the rod chamber and the rodless chamber through the swing arm directional valve, so that the piston rod of the swing arm oil cylinder will automatically retract or extend due to the pressure or tension received at both ends, and the swing arm will accordingly perform a rotational movement of folding inward or unfolding outward as the moving arm moves. Furthermore, the follow-up effect that the swing arm moves along with the movement of the moving arm can be achieved, which is simple and easy to operate, safe and reliable, and can prevent damage to the structure of the pulling arm system, and the service life of the equipment is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0046] Figure 1 One of the operation schematic diagrams of the garbage truck according to the embodiment of the present application;

[0047] Figure 2 Another operation schematic diagram of the garbage truck according to the embodiment of the present application;

[0048] Figure 3 For Figure 1 the schematic diagram of the towing device in

[0049] Figure 4 For Figure 2 the schematic diagram of the towing device in

[0050] Figure 5 For Figure 3 and Figure 4 the schematic diagram of the combined structure of the swing arm and the locking mechanism in

[0051] Figure 6 the hydraulic schematic diagram of the oil cylinder drive follow-up system according to the embodiment of the present application;

[0052] Figure 7 For Figure 6 the symbol schematic diagram when the swing arm directional valve is in the first state in

[0053] Figure 8 For Figure 6 the symbol schematic diagram when the swing arm directional valve is in the second state in

[0054] Figure 9 For Figure 6Symbolic schematic diagram of the middle swing arm directional valve in the third state;

[0055] Figure 10 is Figure 6 Symbolic schematic diagram of the middle lift directional valve in the first state;

[0056] Figure 11 is Figure 6 Symbolic schematic diagram of the middle lift directional valve in the second state;

[0057] Figure 12 is Figure 6 Symbolic schematic diagram of the middle lift directional valve in the third state.

[0058] Icons: 100 - traction device; 110 - chassis; 111 - lift cylinder shaft; 112 - rear frame rotation shaft; 113 - guide roller; 120 - lift arm; 121 - middle frame cylinder shaft; 122 - middle frame rotation shaft; 123 - front frame rotation shaft; 124 - swing arm cylinder shaft; 130 - swing arm; 131 - hook body; 132 - front frame cylinder shaft; 140 - swing arm; 150 - lift cylinder; 160 - swing arm cylinder; 170 - lock box cylinder; 171 - lock rod; 180 - moving arm; 300 - oil cylinder drive follow-up system; 310 - oil inlet pipeline; 311 - oil inlet pipe; 314 - oil pump; 315 - power take-off; 320 - oil return pipeline; 321 - oil return pipe; 322 - overflow valve; 323 - oil return 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 lift oil circuit; 381 - second lift oil circuit; 382 - valve preset interface; 383 - balance valve group; 384 - lift solenoid valve; 390 - swing arm check valve; 391 - lift check valve; 393 - fuel tank; 500 - chassis; 700 - box body; 710 - cross beam. Specific implementation manners

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0060] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0061] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0062] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0063] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0064] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0065] The following will describe in detail some embodiments of the present application with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0066] An embodiment of the present application discloses a traction device 100, which is applied to a garbage truck and is mainly used for the loading and unloading of a box body 700.

[0067] Reference Figures 1 to 4, the towing device 100 includes a chassis 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 chassis 110, and one end of the moving arm 180 is hinged to one end of the chassis 110. The chassis 110 is used to be fixed 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, and the other end of the swing arm 130 has a hook body 131 for hooking the bottom cross beam 710 of the box body 700. Both ends of the swing arm cylinder 160 are respectively hinged to the moving arm 180 and the swing arm 130.

[0068] Among them, the moving arm 180 includes a lifting arm 120 and a rotating arm 140. One end of the rotating arm 140 is hinged to the chassis 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, 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 chassis 110 through the rotating arm 140, and at the same time, the segmented hinge structure can also increase the flexibility of the entire moving arm 180.

[0069] Specifically, the lifting cylinder 150 is hinged to the front end of the chassis 110 through a lifting cylinder shaft 111, and the piston rod of the lifting cylinder 150 is hinged to the middle part of the lifting arm 120 through a middle frame cylinder shaft 121.

[0070] One end of the rotating arm 140 is hinged to the rear end of the chassis 110 through a rear frame rotating shaft 112, and the other end of the rotating arm 140 is hinged to one end of the lifting arm 120 through a middle frame rotating shaft 122.

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

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

[0073] Reference Figure 5 , in this embodiment, the towing device 100 further includes a locking mechanism. The locking mechanism includes a lock box cylinder 170 and a lock rod 171. The fixed end of the lock box cylinder 170 is fixedly connected to the swing arm 130, and the free end of the lock box cylinder 170 is connected to the lock rod 171. The lock rod 171 is used to open or seal the hook opening of the hook body 131 under the drive of the lock box cylinder 170. In this way, the extension of the lock box cylinder 170 can ensure the reliable connection between the hook body 131 and the bottom cross beam 710 of the box body 700 and prevent loosening. When the lock box cylinder 170 shortens, the cross beam 710 can be disengaged from the hook opening of the hook body 131, which is convenient for unlocking and also convenient for the conversion between the box pulling and unloading operations.

[0074] Reference Figure 6 Figure 6 , this embodiment also discloses an oil cylinder driving follow-up system 300, which is mainly used to drive the above-mentioned lifting oil cylinder 150 and swing arm oil cylinder 160.

[0075] The oil cylinder driving follow-up system 300 includes an oil inlet pipeline 310, a lifting reversing valve 340, a swing arm reversing valve 330 and an oil return pipeline 320;

[0076] Both the lifting reversing valve 340 and the swing arm reversing valve 330 are connected between the oil inlet pipeline 310 and the oil return pipeline 320;

[0077] The lifting reversing valve 340 is used to connect the rod chamber and the rodless chamber of the lifting oil cylinder 150, and can make one of the rod chamber and the rodless chamber of the lifting oil cylinder 150 communicate with the oil inlet pipeline 310, and the other communicate with the oil return pipeline 320;

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

[0079] Wherein, when the lifting reversing valve 340 makes the rodless chamber or the rod chamber of the lifting oil cylinder 150 communicate with the oil inlet pipeline 310, the swing arm reversing valve 330 can also make both the rod chamber and the rodless chamber of the swing arm oil cylinder 160 communicate with the oil return pipeline 320.

[0080] Continuing from the above, during the operation of pulling the box or unloading the box, the telescopic movement of the lifting oil cylinder 150 can be realized through the lifting reversing valve 340 to drive the movement of the moving arm. During the movement of the moving arm, the rod chamber and the rodless chamber of the swing arm oil cylinder 160 can be made to communicate with the oil return pipeline 320 through the swing arm reversing valve 330. In this way, the swing arm oil cylinder 160 can achieve the intercommunication between the rod chamber and the rodless chamber through the swing arm reversing valve 330, so that the piston rod of the swing arm oil cylinder 160 will automatically retract or extend due to the pressure or tension received at both ends, and the swing arm 130 will accordingly make a rotational movement of folding inward or unfolding outward along with the movement of the moving arm. Furthermore, the follow-up effect that the swing arm 130 moves along with the movement of the moving arm can be achieved, which is simple and easy to operate, safe and reliable, and can prevent damage to the structure of the pulling arm system (that is, prevent abnormal stress on the moving arm and the swing arm 130 from causing damage), extend the service life, and the equipment has a long service life.

[0081] In addition, when it is necessary to expand the swing arm 130 to hook the box body 700 or fold it away from the box body 700, since the telescoping of the swing arm oil cylinder 160 can also be achieved through the swing arm reversing valve 330, the separate control of the expansion or folding action of the swing arm 130 can also be realized, which is convenient for only controlling the swing arm 130 to lock and unlock the box body 700 after the lifting oil cylinder 150 extends and retracts in place.

[0082] Optionally, in combination with Figures 7 to 9 , the swing arm reversing valve 330 is a Y-type reversing valve, which has a P1 port, a T1 port, an A1 port and a B1 port; the P1 port is connected to the oil inlet pipeline 310, the T1 port is connected to the oil return pipeline 320, and the A1 port and the B1 port are respectively used to connect the rodless cavity and the rod cavity of the swing arm oil cylinder 160;

[0083] When the swing arm reversing valve 330 is in the first state, the P1 port and the A1 port are conducted, the B1 port and the T1 port are conducted. At this time, the oil inlet pipeline 310 is conducted with the rodless cavity of the swing arm oil cylinder 160, the rod cavity of the swing arm oil cylinder 160 is conducted with the oil return pipeline 320, the oil pressure in the rodless cavity of the swing arm oil cylinder 160 is greater than the oil pressure in the rod cavity, the swing arm oil cylinder 160 extends, and then the rotation action of the swing arm 130 expanding outwards relative to the lifting arm 120 is realized, so that the hook body 131 moves upwards to hook the cross beam 710 at the bottom of the box body 700;

[0084] 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 conducted with the T1 port. At this time, the oil inlet pipeline 310 is blocked from both the rod cavity and the rodless cavity of the swing arm oil cylinder 160, both the rod cavity and the rodless cavity of the swing arm oil cylinder 160 are conducted with the oil return pipeline 320, and the hydraulic oil can flow between the rod cavity and the rodless cavity of the swing arm oil 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, the P1 port and the B1 port are conducted, the A1 port and the T1 port are conducted. At this time, the oil inlet pipeline 310 is conducted with the rod cavity of the swing arm oil cylinder 160, the oil return pipeline 320 is conducted with the rodless cavity of the swing arm oil cylinder 160, the oil pressure in the rod cavity of the swing arm oil cylinder 160 is greater than the oil pressure in the rodless cavity, the swing arm oil cylinder 160 shortens, and then the rotation action of the swing arm 130 folding inwards relative to the lifting arm 120 is realized, so that the hook body 131 moves downwards to separate from the cross beam 710 at the bottom of the box body 700.

[0086] Specifically, 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;

[0087] 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 to increase the oil pressure of the hydraulic oil introduced into the rodless cavity or the rod cavity of the swing arm oil cylinder 160 from the oil inlet pipeline 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 pipeline 310 can directly return to the oil tank 393 without affecting the circulation of the hydraulic oil.

[0089] Of course, it is understandable that the swing arm oil cylinder 160 and the swing arm reversing valve 330 are connected via a pipeline. Figure 6 That is, the rodless chamber of the swing arm cylinder 160 and the A1 port of the swing arm reversing valve 330 are connected by the first swing arm oil circuit 370, and the rod chamber of the swing arm cylinder 160 and the B1 port of the swing arm reversing valve 330 are connected by the second swing arm oil circuit 371.

[0090] In addition, the first swing arm oil circuit 370 and the second swing arm oil circuit 371 can each extend an additional swing arm branch oil circuit to connect to the return oil pipeline 320 , and a pressure regulating valve 373 is set on these two swing arm branch oil circuits to adjust the oil pressure of the swing arm cylinder 160 .

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

[0092] By setting the throttle valve 360, when both the rod chamber and the rodless chamber of the swing arm cylinder 160 are connected to the return oil pipeline 320 so that the swing arm 130 moves with it, the extension and retraction speed of the swing arm cylinder 160 can be adjusted by relying on the throttle valve 360.

[0093] By setting the swing arm solenoid valve 350, the oil circuit of the swing arm oil cylinder 160 can be locked by closing the swing arm solenoid valve 350, and the swing arm oil cylinder 160 will not extend or retract randomly, ensuring safety. Only after the swing arm solenoid valve 350 is opened can the swing arm reversing valve 330 conduct the rodless cavity or the rod cavity of the swing arm oil cylinder 160 to the oil inlet pipeline 310 to achieve a follow-up effect. That is to say, when the lifting reversing valve 340 is in the first state or the third state, conducting the rodless cavity or the rod cavity of the lifting oil cylinder 150 to the oil inlet pipeline 310, and the swing arm solenoid valve 350 is opened, the swing arm reversing valve 330 can conduct both the rodless cavity and the rod cavity of the swing arm oil cylinder 160 to the oil return pipeline 320 to achieve the follow-up of the swing arm oil cylinder 160 with the lifting oil cylinder 150. In other words, when the lifting reversing valve 340 is in the first state or the third state, the swing arm solenoid valve 350 is energized and conducted, so that the first swing arm oil circuit 370 communicates with the rodless cavity of the swing arm oil cylinder 160, and the second swing arm oil circuit 371 communicates with the rod cavity of the swing arm oil cylinder 160. At this time, when the swing arm reversing valve 330 is switched to the second state, the first swing arm oil circuit 370 and the second swing arm oil circuit 371 can communicate through the oil return pipeline 320, so as to realize the communication of the rod cavity and the rodless cavity oil circuits of the swing arm reversing valve 330, and further realize that when the lifting oil cylinder 150 moves, the two ends of the 160 swing oil cylinder are stressed and follow-up extend and retract to achieve a follow-up effect.

[0094] Combined with Figures 10 to 12 , the lifting reversing valve 340 is a Y-type reversing valve, which has a P2 port, a T2 port, an A2 port and a B2 port; the P2 port is connected to the oil inlet pipeline 310, the T2 port is connected to the oil return pipeline 320, and the A2 port and the B2 port are respectively used to connect the rodless cavity and the rod cavity of the lifting oil cylinder 150;

[0095] When the lifting reversing valve 340 is in the first state, the P2 port is conducted with the A2 port, and the B2 port is conducted with the T2 port. At this time, the rodless cavity of the lifting oil cylinder 150 is conducted with the oil inlet pipeline 310, and the rod cavity is conducted with the oil return pipeline 320. In this way, the oil pressure in the rodless cavity of the lifting oil cylinder 150 is greater than the oil pressure in the rod cavity, and the lifting oil cylinder 150 extends, thereby driving the lifting arm 120 to rotate and lift.

[0096] When the lifting reversing valve 340 is in the second state, the P2 port is blocked, and both the A2 port and the B2 port are conducted with the T2 port. At this time, both the rodless cavity and the rod cavity of the lifting oil cylinder 150 are conducted with the oil return pipeline 320, and the hydraulic oil can flow between the rod cavity and the rodless cavity of the swing arm oil cylinder 160. In this way, at the end of the box pulling operation (when the box 700 is about to be completely laid flat), the lifting arm 120 shortens the lifting oil cylinder 150 under the pressure of the box 700 until the lifting arm 120 is completely laid flat, playing a buffering function.

[0097] When the lift reversing valve 340 is in the third state, the P2 port is in communication with the B2 port, and the A2 port is in communication with the T2 port. At this time, the rod chamber of the lift cylinder 150 is in communication with the oil inlet pipeline 310, and the rodless chamber is in communication with the oil return pipeline 320. In this way, the oil pressure in the rod chamber of the lift cylinder 150 is greater than that in the rodless chamber, and the lift cylinder 150 shortens, thereby driving the lift arm 120 to rotate and gradually lower and flatten.

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

[0099] When the lift reversing valve 340 is in the first state or the third state, the P4 port and the T4 port are blocked to increase the oil pressure of the hydraulic oil flowing into the rodless chamber or the rod chamber of the lift cylinder 150 from the oil inlet pipeline 310.

[0100] When the lift reversing valve 340 is in the second state, the P4 port and the T4 port are in communication, so that the hydraulic oil in the oil inlet pipeline 310 directly returns to the fuel tank 393 without affecting the circulation of the hydraulic oil.

[0101] In addition, since both the lift reversing valve 340 and the swing arm reversing valve 330 adopt Y-type three-position six-way valves, the oil inlet pipeline 310 can be directly connected to the P3 port of the swing arm reversing valve 330, the T3 port of the swing arm reversing valve 330 is connected to the P4 port of the lift reversing valve 340, and the T4 port of the lift reversing valve 340 is connected to the oil return pipeline 320; alternatively, the oil inlet pipeline 310 can be directly connected to the P4 port of the lift reversing valve 340, the T4 port of the lift reversing valve 340 is connected to the P3 port of the swing arm reversing valve 330, and the T3 port of the swing arm reversing valve 330 is connected to the oil return pipeline 320. This can reduce the complexity of the pipeline of the hydraulic system.

[0102] It should be noted that in some embodiments, the buffering function before the box body 700 is about to be flattened may not be required, and the lift reversing valve 340 may also be other types of valves, such as an O-type reversing valve, etc.

[0103] Of course, it can be understood that the lift cylinder 150 and the lift reversing valve 340 are connected by pipelines. Continuing to refer to Figure 6 , that is, the rodless chamber of the lift cylinder 150 and the A2 port of the lift reversing valve 340 are connected by a first lift oil circuit 380, and the rod chamber of the lift cylinder 150 and the B2 port of the lift reversing valve 340 are connected by a second lift oil circuit 381.

[0104] In addition, an additional lift branch oil line can be extended from both the first lift oil line 380 and the second lift oil line 381 and connected to the oil return line 320. A valve preset interface 382 is provided on these two lift branch oil lines as a backup. Various functional valves can be installed at the valve preset interface 382 as needed, and when not needed, the lift branch oil line can be blocked to prevent oil flow.

[0105] The cylinder drive follow-up system 300 further includes a balance valve group 383 and / or an openable or closable lift solenoid valve 384. The balance valve group 383 is connected between the lift cylinder 150 and the lift reversing valve 340, and the lift solenoid valve 384 is connected between the rodless chamber of the lift cylinder 150 and the lift reversing valve 340.

[0106] Specifically, the balance valve group 383 is connected in series on the first lift oil line 380 and the second lift oil line 381 to maintain stable oil pressure and flow rate.

[0107] The lift solenoid valve 384 is connected in series on the first lift oil line 380 and is in parallel with the balance valve group 383. By opening the lift solenoid valve 384, the rate of the lift cylinder 150 retracting under the pressure of the box body 700 is slowed down. That is to say, when the lift solenoid valve 384 is open, the lift reversing valve 340 can conduct both the rod chamber and the rodless chamber of the lift cylinder 150 to the oil return line 320, so as to achieve slow retraction of both ends of the lift cylinder 150 under pressure. In other words, when the lift solenoid valve 384 is energized and open, the lift reversing valve 340 can be switched to the second state. The box body 700 presses on the moving arm under its own gravity, so that both ends of the lift cylinder 150 are under external pressure and slowly retract by themselves, and the box body 700 slowly descends, thus achieving a buffering effect.

[0108] The oil inlet line 310 includes an oil inlet pipe 311 and an oil pump 314 provided on the oil inlet pipe 311. The inlet of the oil inlet pipe 311 is connected to the fuel tank 393.

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

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

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

[0112] The oil pump 314 realizes the circulation of hydraulic oil when it is running. The power of the oil pump 314 can be provided by the engine of the garbage, for example, the power of the engine is transmitted to the oil pump 314 through the power take-off 315 to drive the operation of the oil pump 314. A return oil check valve 323 is provided on the return oil pipe 321 to ensure the one-way circulation of the oil circuit.

[0113] A swing arm check valve 390 is provided between the P1 port of the swing arm reversing valve 330 and the oil inlet pipe 311 of the oil inlet pipeline 310, and a lift check valve 391 is provided between the P2 port of the lift reversing valve 340 and the oil inlet pipe 311 of the oil inlet pipeline 310 to ensure one-way flow of the hydraulic oil.

[0114] It can be understood that the driver can control the various valves in the oil pump 314 drive system by pressing various buttons on the operation box. The operation box is electrically connected to the electronic control system. The user instructions received by the operation box are transmitted to the electronic control system, and then the electronic control system controls the action of the corresponding valves.

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

[0116] (1) Box pulling operation

[0117] During docking with the box 700, the vehicle moves backwards and approaches the box 700, and the guide roller 113 contacts the bottom track of the box 700. The lifting cylinder 150 is lifted to a certain angle, and the lifting arm 120 is in the lifting state. The "swing arm 130 up" button on the operation box is pressed, 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 body 131 hooks the crossbeam 710 at the bottom of the box 700, and then the piston rod of the locking cylinder 170 extends to drive the locking rod 171 to lock the crossbeam 710 of the box 700, completing the preparation before pulling the box.

[0118] During the process of pulling the box, the button "main arm lowering" is operated on the control box, and the electronic control system controls the lifting reversing valve 340 to be in the third state, and the lifting cylinder 150 is shortened. At the same time, the electronic control system controls the swing arm solenoid valve 350 to open, and the swing arm reversing valve 330 is in the second state. At this time, the rod chamber and the rodless chamber of the swing arm cylinder 160 are connected through the swing arm reversing valve 330. When pulling the box, the swing arm cylinder 160 is subjected to external force (the two ends of the cylinder are compressed), and the oil in the rod chamber and the rodless chamber can flow through the B1 port and the A1 port, so that the swing arm 130 can move with the lifting arm 120; the lifting cylinder 150 continues to retract, and the lifting arm 120 and the box body 700 are laid flat.

[0119] (2) Unloading operation

[0120] The unboxing process is the reverse process of the box pulling process. When the button "Main Arm Lift" on the operation control box is operated, the electronic control system controls the lifting directional valve 340 to be in the first state, and the lifting cylinder 150 extends to drive the lifting arm 120 to lift. At the same time, the electronic control system controls the swing arm solenoid valve 350 on the oil path of the swing arm cylinder to open, and the swing arm directional valve 330 is in the second state. At this time, the rod chamber and the rodless chamber of the swing arm cylinder 160 are in communication. When unboxing, the swing arm cylinder 160 is subjected to an external force (tensile force at both ends of the cylinder), and the oil in the rod chamber and the rodless chamber can flow through each other through port B1 and port A1, so that the swing arm 130 moves along with the lifting arm 120; the lifting cylinder 150 continues to extend, and the box body 700 is placed vertically.

[0121] At the end stage of the unboxing process (the reverse process of docking the box body 700), after the box body 700 is placed vertically and flat, the lifting cylinder 150 remains stationary, the lock box cylinder 170 is retracted, and the corresponding lock rod 171 is retracted. Press the button "Swing Arm 130 Lower" on the operation box, and the electronic control system controls the swing arm directional valve 330 to be in the third state. At the same time, the swing arm solenoid valve 350 is opened, the swing arm cylinder 160 retracts, and the swing arm 130 swings backward and downward to retract. The lifting cylinder 150 retracts, and the lifting arm 120 swings forward to the horizontal position.

[0122] In addition, the embodiment of the present application also discloses a garbage truck, which includes the oil cylinder drive follow-up system 300 and the traction device 100 of the above embodiment.

[0123] In summary, the embodiment of the present application discloses an oil cylinder drive follow-up system 300, a traction device 100, and a garbage truck, which have at least the following advantages compared with the prior art:

[0124] 1. This solution has the convenience of operation. During the box pulling or unboxing process, the driver only needs to operate one button to complete the box pulling or unboxing action, avoiding the need for the driver in the prior art to repeatedly operate the buttons for two actions (one is the lifting button, and the other is the telescopic or swinging button), thereby reducing the driver's operation difficulty and intensity.

[0125] 2. Due to the application of the follow-up technology, the force on the structural components of the pulling arm system (mainly the lifting arm 120 and the swing arm 130) is protected, and the structural components will not be abnormally stressed due to the driver's operation error, which may lead to damage to the structural components. Therefore, the service life can be extended, and it is safe and reliable.

[0126] 3. The upper mounting design of this solution is light in weight, the curb weight of the whole vehicle is light, the rated load mass of the whole vehicle is increased, more goods can be loaded, and the operation cost can be reduced.

[0127] Finally, it should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such a process, method, article or device.

[0128] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cylinder driven follow-up system for a traction device (100), characterized in that: The traction device (100) comprises a base frame (110), a lifting cylinder (150), a movable 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); the other end of the lifting cylinder (150) is hinged to the middle of the movable arm (180); one end of the movable arm (180) is hinged to the other end of the base frame (110); one end of the swing arm (130) is hinged to the other end of the movable arm (180); the other end of the swing arm (130) is provided with a hook body (131) for hooking the box body (700); and two ends of the swing arm cylinder (160) are respectively hinged to the movable arm (180) and the swing arm (130); The oil cylinder drive follower system (300) comprises an oil inlet pipeline (310), a lifting reversing valve (340), a swing arm reversing valve (330) and an oil return pipeline (320); The lifting reversing valve (340) and the swing arm reversing valve (330) are both connected between the oil inlet pipeline (310) and the oil return pipeline (320); The lifting reversing valve (340) can make one of the rod chamber and the rodless chamber of the lifting oil cylinder (150) communicate with the oil inlet pipeline (310), and the other communicate with the oil return pipeline (320); The swing arm reversing valve (330) can make one of the rod chamber and the rodless chamber of the swing arm oil cylinder (160) communicate with the oil inlet pipeline (310), and the other communicate with the oil return pipeline (320); Wherein, when the lifting reversing valve (340) connects the rodless chamber or the rod chamber of the lifting cylinder (150) to the oil inlet pipeline (310), the swing arm reversing valve (330) can also connect the rod chamber and the rodless chamber of the swing arm cylinder (160) to the oil return pipeline (320).

2. The oil cylinder driven follow-up system according to claim 1, characterized in that: The swing arm reversing valve (330) 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 pipeline (310), the T1 port is connected to the oil return pipeline (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 oil cylinder (160); When the swing arm reversing valve (330) is in the first state, the P1 port is connected to the A1 port, and the B1 port is connected to the T1 port; When the swing arm reversing valve (330) is in the second state, the P1 port is blocked, and the A1 port and the B1 port are both connected to the T1 port; When the swing arm reversing valve (330) is in the third state, the P1 port is in communication with the B1 port, and the A1 port is in communication with the T1 port.

3. The oil cylinder driven 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 further comprises a P3 port and a T3 port, wherein 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 in conduction.

4. The oil cylinder driven follow-up system according to claim 1, characterized in that: The lifting reversing 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 pipeline (310), the T2 port is connected to the oil return pipeline (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 in conduction with the A2 port, and the B2 port is in conduction with the T2 port; When the lift reversing valve (340) is in the third state, the P2 port is in communication with the B2 port, and the A2 port is in communication with the T2 port.

5. The oil cylinder driven follow-up system according to claim 4, characterized in that: The lifting reversing valve (340) is a Y-type valve. When the lifting reversing 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 reversing valve (340) is a Y-type three-position six-way reversing valve, and further comprises a P4 port and a T4 port, wherein the P4 port is connected to the oil inlet pipeline (310), and the T4 port is connected to the oil return pipeline (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 lift reversing valve (340) is in the second state, the P4 port and the T4 port are in conduction.

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

7. The oil cylinder driven follow-up system according to claim 6, characterized in that: The swing arm reversing valve (330) 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 pipeline (310), the T1 port is connected to the oil return pipeline (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 oil cylinder (160); The lifting reversing 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 pipeline (310), the T2 port is connected to the oil return pipeline (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 in conduction with the A2 port, and the B2 port is in conduction with the T2 port; When the lifting reversing valve (340) is in the third state, the P2 port is in conduction with the B2 port, and the A2 port is in conduction with the T2 port; When the lifting reversing valve (340) is in the first state or the third state, and the swing arm solenoid valve (350) is opened, the swing arm reversing valve (330) can be switched 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 oil cylinder driven follow-up system according to claim 1, 4 or 5, characterized in that: The oil cylinder drive follow-up system further comprises a balance valve group (383) and / or a lifting solenoid valve (384) that can be opened or closed, wherein the balance valve group (383) is connected between the lifting oil cylinder (150) and the lifting reversing valve (340), and the lifting solenoid valve (384) is connected between the rodless chamber of the lifting oil cylinder (150) and the lifting reversing valve (340); When the lifting solenoid valve (384) is opened, the lifting reversing valve (340) can connect both the rod chamber and the rodless chamber of the lifting oil cylinder (150) to the oil return pipeline (320).

9. A traction device, characterized in that: The utility model comprises a base frame (110), a lifting cylinder (150), a movable arm (180), a swing arm cylinder (160) and a swing arm (130), wherein one end of the lifting cylinder (150) is hinged to one end of the base frame (110), the other end of the lifting cylinder (150) is hinged to the middle part of the movable arm (180), one end of the movable arm (180) is hinged to the other end of the base frame (110), one end of the swing arm (130) is hinged to the other end of the movable arm (180), the other end of the swing arm (130) is provided with a hook body (131) for hooking a box body (700), and the two ends of the swing arm cylinder (160) are respectively hinged to the movable arm (180) and the swing arm (130); Wherein, the lifting cylinder (150) and the swing arm cylinder (160) are driven by the cylinder drive follower system (300) described in any one of claims 1 to 8.

10. The traction device according to claim 9, characterized in that: The traction device (100) further comprises a locking mechanism, the locking mechanism comprising a locking box oil cylinder (170) and a locking rod (171), the fixed end of the locking box oil cylinder (170) is fixedly connected to the swing arm (130), the free end of the locking box oil cylinder (170) is connected to the locking rod (171), and the locking rod (171) is used to open or close the hook opening of the hook body (131) under the drive of the locking box oil cylinder (170); and / or, The movable arm (180) comprises 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), and the lifting cylinder (150) is hinged to the middle part of the lifting arm (120).

11. A garbage truck, characterized in that: It comprises the oil cylinder driven follower system (300) as described in any one of claims 1 to 8 and the traction device (100) as described in claim 8 or 9.

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