Garbage truck hydraulic system, garbage truck and hydraulic control method

Abstract

The embodiment of the invention provides a garbage truck hydraulic system, a garbage truck and a control method, and relates to the field of garbage trucks. The hydraulic system of the garbage truck comprises an oil tank, an oil pump, a main oil inlet path, a main oil return path, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve, a supporting leg oil path, a scraper oil path, a sliding plate oil path, a barrel turning oil path and a two-way electromagnetic reversing valve. The two-way electromagnetic reversing valve is arranged between the first reversing valve and a rodless cavity of the supporting leg oil cylinder; under the driving of the oil pump, the scraper oil cylinder, the sliding plate oil cylinder and the barrel overturning oil cylinder perform composite action, and under the condition that any one of the scraper oil cylinder, the sliding plate oil cylinder and the barrel overturning oil cylinder performs composite telescopic action, the supporting leg oil cylinder is kept locked. By arranging the two-way electromagnetic reversing valve, the situation that the first reversing valve leaks inwards when other oil ways act compositely can be prevented, then the landing leg oil cylinder is prevented from acting under the condition that the first reversing valve is located at the middle position for pressure building, and therefore the landing leg falling phenomenon is prevented, and driving safety is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control systems for garbage trucks, and in particular to a hydraulic system for a garbage truck, a garbage truck, and a hydraulic control method. Background Art

[0002] Currently, self-loading garbage trucks are primarily used for collecting and transporting domestic waste in urban residences, streets, and markets. Due to their compact width, high loading capacity, adaptability, and extensive equipment requirements, these trucks require a wide range of equipment. During the loading process, the compacting mechanism performs a compacting cycle: the slide moves forward, the scraper closes, the slide moves backward, and the scraper opens. The loading mechanism then performs the lifting and unloading action.

[0003] However, in the related art, when garbage trucks are performing filling and loading operations, the outriggers frequently extend or fall off, which poses a great safety hazard to the garbage truck transfer work. Summary of the Invention

[0004] The present invention provides a hydraulic system for a garbage truck, a garbage truck and a hydraulic control method, which can ensure that the outrigger oil cylinder does not extend when other mechanisms of the garbage truck except the outriggers are working, thereby ensuring driving safety and improving reliability.

[0005] The embodiments of the present invention can be implemented as follows: An embodiment of the present invention provides a hydraulic system for a garbage truck, comprising: a fuel tank, an oil pump, a main oil inlet circuit, a main oil return circuit, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve, an outrigger oil circuit, a scraper oil circuit, a slide oil circuit, a bucket oil circuit, and a two-way electromagnetic reversing valve; the oil outlet of the fuel tank is interconnected with the oil suction port of the oil pump, the oil outlet of the oil pump is interconnected with the main oil inlet circuit, and the oil return port of the fuel tank is interconnected with the main oil return circuit; The first reversing valve, the second reversing valve, the third reversing valve and the fourth reversing valve are all connected in parallel between the main oil inlet circuit and the main oil return circuit; The outrigger oil cylinder is provided in the outrigger oil circuit, and the first reversing valve is capable of connecting one of the rod chamber and the rodless chamber of the outrigger oil cylinder to the main oil inlet circuit and the other to the main oil return circuit; The scraper oil cylinder is arranged in the scraper oil circuit, and the second reversing valve can make one of the rod chamber and the rodless chamber of the scraper oil cylinder be connected to the main oil inlet circuit, and the other be connected to the main oil return circuit; The slide plate oil cylinder is arranged in the slide plate oil circuit, and the third reversing valve can make one of the rod chamber and the rodless chamber of the slide plate oil cylinder be connected to the main oil inlet circuit, and the other be connected to the main oil return circuit; The barrel turning cylinder is provided in the barrel turning oil circuit, and the fourth reversing valve is capable of connecting one of the rod chamber and the rodless chamber of the barrel turning cylinder to the main oil inlet circuit, and the other to the return oil circuit; The two-way electromagnetic reversing valve is arranged between the first reversing valve and the rodless chamber of the outrigger oil cylinder; under the drive of the oil pump, the scraper oil cylinder, the skateboard oil cylinder, and the bucket turning oil cylinder perform a compound action. When any one of the scraper oil cylinder, the skateboard oil cylinder, and the bucket turning oil cylinder performs a compound telescopic action, the outrigger oil cylinder remains locked.

[0006] In an optional embodiment, the bidirectional electromagnetic reversing valve has a left position and a right position. When the bidirectional electromagnetic reversing valve is in the left position, the two ports of the bidirectional electromagnetic valve are electrically connected; when the bidirectional electromagnetic reversing valve is in the right position, the bidirectional electromagnetic valve is de-energized and bidirectionally cut off.

[0007] In an optional embodiment, the first reversing valve is an O-type three-position four-way reversing valve having ports T1, P1, A1, and B1, wherein the P1 port is connected to the main oil inlet circuit, the T1 port is connected to the main oil return circuit, and the A1 port and the B1 port are respectively used to connect to the rodless chamber and the rod chamber of the outrigger cylinder; When the first reversing valve 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 first reversing valve is in the second state, the P1 port is connected to the B1 port, and the A1 port is connected to the T1 port; When the first reversing valve is in the third state, the P1 port is not in communication with the A1 port and the B1 port, and the T1 port is not in communication with the A1 port and the B1 port; When the two-way electromagnetic reversing valve is in the right position, the first reversing valve is in the third state.

[0008] In an optional embodiment, the second reversing valve, the third reversing valve, and the fourth reversing valve are all three-position four-way reversing valves, the second reversing valve has T2, P2, A2, and B2 ports, the third reversing valve has T3, P3, A3, and B3 ports, and the fourth reversing valve has T4, P4, A4, and B4 ports. The P2, P3, and P4 ports are respectively connected to the main oil inlet circuit, the T2, T3, and T4 ports are respectively connected to the main oil return circuit, and the A2, A3, and A4 ports and the B2, B3, and B4 ports are respectively used to connect the rodless chamber and the rod chamber of the scraper cylinder, the slide cylinder, and the bucket turning cylinder; When the second reversing valve 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 second reversing valve is in the second state, the P2 port is connected to the B2 port, and the A2 port is connected to the T2 port; When the third reversing valve is in the first state, the P3 port is connected to the A3 port, and the B3 port is connected to the T3 port; When the third reversing valve is in the second state, the P3 port is in communication with the B3 port, and the A3 port is in communication with the T3 port.

[0009] When the fourth reversing valve is in the first state, the P4 port is connected to the A4 port, and the B4 port is connected to the T4 port; When the fourth reversing valve is in the second state, the P4 port is in communication with the B4 port, and the A4 port is in communication with the T4 port.

[0010] When any one of the second reversing valve, the third reversing valve, and the fourth reversing valve is in the first state or the second state, the first reversing valve is in the third state.

[0011] In an optional embodiment, the garbage truck hydraulic system further includes a first hydraulic lock, which is disposed between the outrigger cylinder and the first reversing valve.

[0012] In an optional embodiment, the garbage truck hydraulic system also includes a lifting oil circuit, which is connected in parallel with the support leg oil circuit. The lifting cylinder is arranged in the lifting oil circuit, and the first reversing valve can make one of the rod chamber and the rodless chamber of the lifting cylinder connected to the main oil inlet circuit and the other connected to the main oil return circuit; a balancing valve is arranged between the lifting cylinder and the first reversing valve.

[0013] In an optional embodiment, the garbage truck hydraulic system further includes a second hydraulic lock, which is provided between the second reversing valve and the scraper cylinder; and / or, the second reversing valve is a Y-type three-position four-way reversing valve, and when the second reversing valve is in the third state, the P2 port is disconnected, and the A2 port and the B2 port are both connected to the T2 port; and / or, The hydraulic system of the garbage truck further includes a third hydraulic lock, which is arranged between the third reversing valve and the slide cylinder; and / or, the third reversing valve is a Y-type three-position four-way reversing valve, and when the third reversing valve is in the third state, the P3 port is disconnected, and the A3 port and the B3 port are both connected to the T3 port; and / or, The hydraulic system of the garbage truck further includes a fourth hydraulic lock, which is arranged between the fourth reversing valve and the bucket turning cylinder; And / or, the fourth reversing valve is a Y-type three-position four-way reversing valve. When the fourth reversing valve is in the third state, the P4 port is disconnected, and the A4 port and the B4 port are both connected to the T4 port.

[0014] In an optional embodiment, the garbage truck hydraulic system further includes a first overflow valve, which is arranged between the main oil inlet circuit and the main oil return circuit; and / or, The hydraulic system of the garbage truck further includes a fifth reversing valve, which is arranged between the main oil inlet circuit and the main oil return circuit.

[0015] In an optional embodiment, the garbage truck hydraulic system further includes a second overflow valve, one end of which is connected to the oil return port of the oil tank, and the other end of which is connected to the rodless chamber of the scraper cylinder; and / or, The hydraulic system of the garbage truck further includes a third overflow valve, one end of which is communicated with the oil return port of the oil tank, and the other end of which is communicated with the rodless chamber of the slide cylinder.

[0016] An embodiment of the present invention further provides a garbage truck, comprising a vehicle body and the garbage truck hydraulic system described in any one of the above embodiments, wherein the garbage truck hydraulic system is arranged on the vehicle body.

[0017] In an optional embodiment, the garbage truck hydraulic system further includes a lifting oil circuit, the lifting oil circuit being connected in parallel with the outrigger oil circuit, the lifting oil cylinder being disposed in the lifting oil circuit, and the first reversing valve being capable of connecting one of the rod chamber and the rodless chamber of the lifting oil cylinder to the main oil inlet circuit and the other to the main oil return circuit; The vehicle body includes a trash bin, a subframe and legs, the lifting cylinder is connected between the subframe and the trash bin, and the subframe is provided with a proximity switch; When the first reversing valve is connected to the main oil inlet circuit, the two-way electromagnetic reversing valve is energized, the outrigger oil circuit is first connected, the outrigger oil cylinder extends and drives the outrigger to extend, and after the outrigger is fully extended, the lifting oil circuit is connected, the lifting oil cylinder extends and drives the trash bin to lift; When the first reversing valve is connected to the main oil return circuit, the lifting oil circuit is opened first, the lifting cylinder retracts and drives the trash bin to descend; when the trash bin descends to contact the sub-frame, the proximity switch is energized to control the two-way electromagnetic reversing valve to be energized, the outrigger oil circuit is opened, the outrigger cylinder retracts and drives the outrigger to retract.

[0018] An embodiment of the present invention further provides a hydraulic control method for a garbage truck, which is applied to the hydraulic system of a garbage truck or the garbage truck described in any of the above embodiments. The control method includes: Pumping the hydraulic oil from the oil tank to the main oil inlet line through the oil pump; controlling the operation of at least one of the first reversing valve, the second reversing valve, the third reversing valve, and the fourth reversing valve so that the main oil inlet line is connected to the rod chamber or rodless chamber of the corresponding outrigger cylinder, the scraper cylinder, the slide plate cylinder, or the bucket cylinder, and the main oil return line is connected to the corresponding rodless chamber or rod chamber; When the scraper cylinder, the skateboard cylinder or the bucket-turning cylinder performs a compound telescopic action, that is, when at least one of the scraper oil circuit, the skateboard oil circuit and the bucket-turning oil circuit is connected to the main oil inlet circuit and the main oil return circuit, the first reversing valve is controlled to switch to the third state, and the two-way electromagnetic reversing valve is controlled to be in the right position, so that the rodless chamber of the support leg cylinder is locked, thereby preventing the support leg cylinder from extending.

[0019] In an optional embodiment, the control method further includes: when the outrigger cylinder needs to be actuated, controlling the two-way electromagnetic reversing valve to be in the left position, and controlling the first reversing valve to switch to the first state or the second state to achieve the extension or retraction of the outrigger cylinder.

[0020] In an optional embodiment, the hydraulic system of the garbage truck further includes a lifting oil circuit, the lifting oil circuit being connected in parallel with the outrigger oil circuit, the lifting cylinder being provided in the lifting oil circuit, the first reversing valve being capable of causing one of the rod chamber and the rodless chamber of the lifting cylinder to communicate with the main oil inlet circuit, and the other to communicate with the main oil return circuit; the vehicle body includes a garbage bin, a subframe, and outriggers, the lifting cylinder being connected between the subframe and the garbage bin, the subframe being provided with a proximity switch; the proximity switch being used to detect the relative position of the garbage bin and the subframe; The control method further includes: When the first reversing valve is switched to be connected to the main oil inlet circuit, the two-way electromagnetic reversing valve is controlled to be energized, so that the two ports of the two-way electromagnetic reversing valve are in a state of being energized and connected, so that the outrigger oil circuit is preferentially connected, driving the outrigger oil cylinder to extend, thereby driving the outrigger to extend; after the outrigger is fully extended, the lifting oil circuit is connected, driving the lifting oil cylinder to extend and driving the trash bin to be lifted; When the first reversing valve is connected to the main oil return circuit, the lifting oil circuit is opened first, the lifting cylinder retracts and drives the trash bin to descend; when the trash bin descends to contact the sub-frame, the proximity switch detects that it is in place and triggers the two-way electromagnetic reversing valve to be energized, so that the outrigger oil circuit is opened, driving the outrigger cylinder to retract and drive the outrigger to retract.

[0021] The beneficial effects of the garbage truck hydraulic system, garbage truck, and hydraulic control method according to the embodiments of the present invention include, for example: After the oil pump is turned on, the oil pump with stop valve is turned on, and the oil return line is turned on, and the oil inlet of oil tank is turned off. In addition, the oil inlet of oil tank is turned on, and the oil return line of oil tank is turned on, and ... One of the rod chamber and the rodless chamber is connected to the main oil inlet circuit, and the other is connected to the main oil return circuit; the skateboard cylinder is arranged in the skateboard oil circuit, and the third reversing valve can make one of the rod chamber and the rodless chamber of the skateboard cylinder connected to the main oil inlet circuit, and the other is connected to the main oil return circuit; the bucket flipping cylinder is arranged in the bucket flipping oil circuit, and the fourth reversing valve can make one of the rod chamber and the rodless chamber of the bucket flipping cylinder connected to the main oil inlet circuit, and the other is connected to the return oil pipeline; the two-way electromagnetic reversing valve is arranged between the first reversing valve and the rodless chamber of the support leg cylinder; under the drive of the oil pump, the scraper cylinder, the skateboard cylinder and the flipping barrel cylinder perform a compound action, and when any one of the scraper cylinder, the skateboard cylinder and the flipping barrel cylinder performs a compound telescopic action, the support leg cylinder remains locked. When a garbage truck performs a combined compression and filling operation, because the reversing valve is a slide valve structure, even if the first reversing valve is in the neutral position with pressure built in, that is, when the outrigger oil circuit is not connected to the main oil inlet and return lines, oil leakage may occur, causing the outrigger cylinder to actuate and cause the outrigger to fall off, which in serious cases may affect driving safety. By providing a two-way solenoid reversing valve, leakage in the outrigger oil circuit can be prevented when the first reversing valve is in the neutral position with pressure built in. This prevents the outrigger cylinder from extending when the outrigger oil circuit is not connected to the main oil inlet and return lines, causing the outrigger to fall off, thereby ensuring the driving safety of the garbage truck and improving its reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A control principle diagram of a hydraulic system in the prior art provided in an embodiment of the present invention; Figure 2 A control principle diagram of a hydraulic system provided in an embodiment of the present invention; Figure 3 Schematic diagram comparing the scraping working pressures of the electromagnetic reversing valve with the O-type and Y-type mid-positions provided in an embodiment of the present invention.

[0024] Icons: 1000-Garbage truck hydraulic system; 100-Fuel tank; 200-Fuel pump; 310-Main oil inlet circuit; 320-Main oil return circuit; 410-Outrigger oil circuit; 411-Two-way electromagnetic reversing valve; 412-First hydraulic lock; 420-Lifting oil circuit; 421-Balance valve; 430-Scraper oil circuit; 431-Second hydraulic lock; 440-Slide plate oil circuit; 441-Third hydraulic lock; 450-Flip Barrel oil circuit; 451-fourth hydraulic lock; 510-first reversing valve; 520-second reversing valve; 530-third reversing valve; 540-fourth reversing valve; 610-outrigger cylinder; 620-lifting cylinder; 630-scraper cylinder; 640-slide plate cylinder; 650-bucket tilting cylinder; 700-first relief valve; 810-second relief valve; 820-third relief valve; 900-fifth reversing valve; In the prior art: 10-main oil inlet circuit; 20-main oil return circuit; 31-outrigger oil circuit; 32-lifting oil circuit; 33-scraper oil circuit; 34-slide plate oil circuit; 35-bucket oil circuit; 11-first reversing valve; 12-second reversing valve; 13-third reversing valve; 14-one-way electromagnetic reversing valve; 15-fourth reversing valve; 40-hydraulic lock; 51-outrigger cylinder; 52-lifting cylinder; 53-scraper cylinder; 54-slide plate cylinder; 55-bucket cylinder; 60-oil tank. DETAILED DESCRIPTION To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0027] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0029] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0030] At present, self-loading and unloading garbage trucks are mainly suitable for the collection and transportation of domestic garbage in urban residences, streets and vegetable markets, because the width of the whole vehicle is small, the loading capacity is strong, the adaptability is good, and many equipment requirements are required. At present, self-loading and unloading garbage trucks are mainly suitable for the collection and transportation of domestic garbage in urban residences, streets and vegetable markets, because the width of the whole vehicle is small, the loading capacity is strong, the adaptability is good, and many equipment requirements are required. In the process of loading garbage by self-loading and unloading garbage trucks, the pressing and filling mechanism performs a pressing and filling cycle: that is, the skateboard moves forward → the scraper scrapes → the skateboard moves backward → the scraper opens in a cycle, and the loading mechanism performs the lifting and unloading action. However, in the related art, when the garbage truck performs the pressing and filling and loading actions, the support legs frequently extend or the legs fall off, which brings great safety hazards to the garbage truck transportation work.

[0031] Figure 1 FIG. 1 is a control principle diagram of a hydraulic system of the prior art provided in an embodiment of the present invention. Figure 1As shown, during the pressure filling cycle action and the loading mechanism pressure holding condition, because the valve core of the multi-way valve is mostly a sliding valve structure, there will be leakage when the mid-position pressure is held up and the cylinder is lifted. The leaked oil will pass through the reversing valve to the hydraulic lock of the outrigger cylinder. Usually, a reversing valve is added between the multi-way valve and the hydraulic lock of the outrigger oil cylinder in the outrigger oil circuit. The added reversing valve is used to switch the action sequence of the outrigger oil cylinder and the lifting cylinder. The principle of this added reversing valve is a normally open type. The flow direction of the oil is one-way flow, only in and not out. The oil flows in one direction. As the cumulative number of loading actions increases, the pressure of the oil passing through the reversing valve eventually rises to reach the opening pressure of the hydraulic lock, which will cause the outrigger oil cylinder to extend or the outrigger to fall off.

[0032] Based on this, see Figure 2 The garbage truck hydraulic system 1000 provided in the embodiments of the present invention can solve the aforementioned technical problems. This system can prevent the outrigger cylinders 610 from extending while other mechanisms besides the outriggers are in operation, ensuring safe driving and improving reliability. This hydraulic system 1000 is applicable to garbage trucks, and garbage trucks equipped with this system also have the same functions as described above, which will not be described in detail here.

[0033] The garbage truck in this embodiment includes a vehicle body and a hydraulic system 1000, which is mounted on the vehicle body. The vehicle body is equipped with a garbage bin, a pressure-filling mechanism, a loading mechanism, and outriggers. The loading mechanism is located behind the garbage bin and is used to lift and dump the garbage bin or hopper into the garbage bin. The pressure-filling mechanism is located above the garbage bin and is used to compress and circulate the garbage in the bin. The outriggers are located below the garbage bin and are used to provide auxiliary support for the garbage truck during unloading. The loading mechanism is connected to the bucket-turning cylinder 650. The bucket-turning cylinder 650 extends to load the garbage, and retracts to unload the garbage. The pressure-filling mechanism includes a scraper assembly and a slide assembly. The scraper cylinder 630 is connected to the scraper assembly, the slide cylinder 640 is connected to the slide assembly, and the slide assembly is connected to the scraper assembly. The slide assembly is used to drive the scraper assembly to move. When the filling mechanism is working, the slide plate assembly first moves forward to the top of the garbage bin feeding port, and the scraper assembly performs the scraping and closing action. The scraper rotates from the highest position to the lowest position and compresses the bulk garbage fed by the bucket tipping mechanism once; the scraper assembly remains at the lowest position and does not move. The slide plate assembly moves backward to drive the scraper assembly to move toward the front end of the garbage bin. The scraper assembly performs a horizontal secondary compression on the garbage that has been compressed once. After the compression is completed, the scraper assembly opens to carry out the next garbage compression action.

[0034] Of course, the garbage truck may also include other structures to achieve multiple functions, which is determined according to actual usage and is not limited here.

[0035] The following is a detailed introduction to the garbage truck hydraulic system 1000.

[0036] Figure 2 FIG. 1 is a control principle diagram of a hydraulic system 1000 for a garbage truck provided in an embodiment of the present invention. Figure 2 As shown, the hydraulic system 1000 of the garbage truck in this embodiment includes an oil tank 100, an oil pump 200, a main oil inlet circuit 310, a main oil return circuit 320, a first reversing valve 510, a second reversing valve 520, a third reversing valve 530, a fourth reversing valve 540, a support leg oil circuit 410, a scraper oil circuit 430, a slide plate oil circuit 440, a barrel turning oil circuit 450 and a two-way electromagnetic reversing valve 411. The oil outlet of the oil tank 100 is interconnected with the oil suction port of the oil pump 200, the oil outlet of the oil pump 200 is interconnected with the main oil inlet 310, and the oil return port of the oil tank 100 is interconnected with the main oil return 320; the first reversing valve 510, the second reversing valve 520, the third reversing valve 530 and the fourth reversing valve 540 are all connected in parallel between the main oil inlet 310 and the main oil return 320; the outrigger oil cylinder 610 is arranged in the outrigger oil circuit 410; the scraper oil cylinder 630 is arranged in the scraper oil circuit 430, and the second reversing valve 520 can make one of the rod chamber and the rodless chamber of the scraper oil cylinder 630 connected to the main oil inlet 310 and the other connected to the main oil return 320; the skateboard oil cylinder 640 is arranged in the skateboard oil circuit 440, and the third reversing valve 530 can make the skateboard oil One of the rod chamber and the rodless chamber of the cylinder 640 is connected to the main oil inlet circuit 310, and the other is connected to the main oil return circuit 320; the barrel-turning cylinder 650 is arranged in the barrel-turning oil circuit 450, and the fourth reversing valve 540 can make one of the rod chamber and the rodless chamber of the barrel-turning cylinder 650 connected to the main oil inlet circuit 310, and the other is connected to the return oil pipeline; the two-way electromagnetic reversing valve 411 is arranged between the first reversing valve 510 and the rodless chamber of the support leg cylinder 610; under the drive of the oil pump 200, the scraper cylinder 630, the skateboard cylinder 640, and the barrel-turning cylinder 650 perform a compound action. When any one of the scraper cylinder 630, the skateboard cylinder 640, and the barrel-turning cylinder 650 performs a compound telescopic action, the support leg cylinder 610 remains locked. The first reversing valve 510 and the two-way solenoid reversing valve 411 also enable one of the rod chamber and the rodless chamber of the outrigger cylinder 610 to communicate with the main oil inlet 310, and the other to communicate with the main oil return 320. A single fuel tank 100 and oil pump 200 can simultaneously control multiple cylinders, reducing the number of power components in the garbage truck hydraulic system 1000 and saving costs. Of course, multiple additional branches can be added in parallel with the circuit with the first reversing valve 510 to enable multiple actions to be controlled by a single fuel tank 100 and oil pump 200. The number of parallel branches is not limited herein.

[0037] In the prior art, reference Figure 1When the garbage truck performs the combined pressure-filling action, because the reversing valve is a sliding valve structure, even if the first reversing valve 11 is in the neutral position with pressure, that is, the outrigger oil circuit 31 is not connected with the main oil inlet circuit 10 and the main oil return circuit 20, oil leakage may still occur. With the frequent actions of the pressure-filling mechanism and the feeding mechanism, the pressure at the port of the one-way electromagnetic reversing valve 14 increases. When the pressure increases to port A and reaches the opening condition of the hydraulic lock 40, the hydraulic lock connected to the rodless chamber of the outrigger oil cylinder 51 is forced to open, so that the oil flow direction of the outrigger oil cylinder 51 is only in and not out, causing the outrigger oil cylinder 51 to extend, thereby causing the outrigger oil cylinder 51 to fall off, which may affect driving safety in severe cases.

[0038] In the present invention, reference is made to Figure 2 By setting up a two-way electromagnetic reversing valve 411, when the first reversing valve 510 is in the middle position and the pressure is blocked, even if the multi-way valve is blocked and hydraulic oil leaks, since the oil flow direction between the two-way electromagnetic reversing valve 411 and the rodless cavity of the outrigger oil cylinder 610 is neither in nor out, the hydraulic lock connected to the rodless cavity and the rod cavity of the outrigger oil cylinder 610 cannot be opened, thereby preventing the outrigger oil cylinder 610 from extending when the outrigger oil circuit 410 is not connected with the main oil inlet circuit 310 and the main oil return circuit 320, preventing the outrigger from falling off, thereby ensuring the driving safety of the garbage truck and improving reliability.

[0039] Specifically, the two-way electromagnetic reversing valve 411 in this embodiment has a left position and a right position. When the two-way electromagnetic reversing valve 411 is in the left position, the two ports of the two-way electromagnetic valve are electrically connected; when the two-way electromagnetic reversing valve 411 is in the right position, the two-way electromagnetic valve is powered off and cut off in both directions.

[0040] Specifically, see Figure 2 In this embodiment, the first reversing valve 510 is an O-type three-position four-way reversing valve having ports T1, P1, A1, and B1. Port P1 is connected to the main oil inlet line 310, port T1 is connected to the main oil return line 320, and ports A1 and B1 are used to connect to the rodless chamber and rod chamber of the outrigger cylinder 610, respectively. When the first reversing valve 510 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 first reversing valve 510 is in the second state, the P1 port is connected to the B1 port, and the A1 port is connected to the T1 port; When the first reversing valve 510 is in the third state, the P1 port is not connected to the A1 port and the B1 port, and the T1 port is not connected to the A1 port and the B1 port. When the two-way electromagnetic reversing valve 411 is in the right position, the first reversing valve 510 is in the third state.

[0041] The first reversing valve 510 adopts an O-type three-position four-way valve. In the O-type neutral position function, the oil ports are not connected to each other, the garbage truck hydraulic system 1000 maintains pressure, and the oil in the two chambers of the leg cylinder 610 or the lifting cylinder 620 is sealed and in a locked state. The O-type neutral position function can maintain high-precision positioning when stopped. In addition, the use of an O-type three-position four-way valve can also ensure that the process of switching the first reversing valve 510, that is, the process from static to starting, is smoother, reducing the impact and vibration during startup. Of course, the first reversing valve 510 can also adopt other types of reversing valves according to actual working conditions, which are not limited here.

[0042] Also, please continue reading Figure 2 To facilitate control of the operating sequence of the lift cylinder 620 and the outrigger cylinder 610 and improve safety during operation of the garbage truck, the garbage truck hydraulic system 1000 in this embodiment further includes a lift oil circuit 420. The lift oil circuit 420 is connected in parallel with the outrigger oil circuit 410. The lift cylinder 620 is disposed in the lift oil circuit 420. The first reversing valve 510 enables one of the rod chamber and the rodless chamber of the lift cylinder 620 to communicate with the main oil inlet circuit 310 and the other to communicate with the main oil return circuit 320. In this embodiment, the first reversing valve 510 controls the communication between the outrigger oil circuit 410 and the lift oil circuit 420 and the main oil inlet circuit 310 and the main oil return circuit 320. When the first reversing valve 510 is in the first state, the two-way electromagnetic reversing valve 411 is energized and is in the left position, at this time, the rodless chamber of the outrigger cylinder 610 and the rodless chamber of the lifting cylinder 620 are connected to the main oil inlet circuit 310, and the rod chamber of the outrigger cylinder 610 and the rod chamber of the lifting cylinder 620 are connected to the main oil return circuit 320; due to the large difference between the weight of the garbage bin itself and the outriggers, the outrigger cylinder 610 will extend first, the outriggers will first support the ground, and then the lifting cylinder 620 will lift the garbage bin, thereby ensuring that the garbage bin can be safely lifted and unloaded. When the first reversing valve 510 is in the second state, at this time, the rod chamber of the lifting cylinder 620 is connected to the main oil inlet circuit 310, and the rodless chamber of the lifting cylinder 620 is connected to the main oil return circuit 320. The garbage bin first drops into place, and after the proximity switch is energized, the two-way electromagnetic reversing valve 411 is controlled to be energized. The two-way electromagnetic reversing valve 411 is in the left position, the rod chamber of the outrigger cylinder 610 is connected to the main oil inlet circuit 310, and the rodless chamber of the outrigger cylinder 610 is connected to the main oil return circuit 320. The outrigger cylinder 610 retracts to achieve outrigger retraction.

[0043] Of course, the lifting oil circuit 420 and the outrigger oil circuit 410 can also be independently controlled by different reversing valves to be connected to the main oil inlet circuit 310 and the main oil return circuit 320, which is not limited here.

[0044] To balance pressure or flow differences within the garbage truck's hydraulic system 1000 and control the movement of the lift cylinder 620 for safety, a balancing valve 421 is installed between the lift cylinder 620 and the first reversing valve 510. This balancing valve 421 applies back pressure during the descent to prevent the lift cylinder 620 from descending at an excessive speed due to gravity, thereby ensuring smooth movement. The load pressure provided by balancing valve 421 ensures a smooth and controllable garbage descent speed and also serves as a burst-proof pipe.

[0045] To maintain the outrigger position and prevent the hydraulic circuit from unexpected outrigger movement due to external loads or gravity, refer to Figure 2 The garbage truck hydraulic system 1000 in this embodiment also includes a first hydraulic lock 412, which is provided between the outrigger cylinder 610 and the first reversing valve 510. The first hydraulic lock 412 forms an interlocking structure through two one-way valves. When the first reversing valve 510 is in the neutral position, the first hydraulic lock 412 blocks the flow of oil, allowing the outrigger cylinder 610 to remain stationary under the action of external loads. In the event of bumpy road conditions or internal leakage in the outrigger cylinder 610 during driving, the first hydraulic lock 412 maintains pressure and prevents the outrigger from falling. That is, in the event of a sudden loss of pressure in the garbage truck hydraulic system 1000, the first hydraulic lock 412 can prevent the outrigger cylinder 610 from moving due to leakage or its own weight, avoiding accidents and thereby improving the safety and reliability of the entire garbage truck hydraulic system 1000.

[0046] The control principle of the circuits controlling the outrigger cylinders 610 and lift cylinders 620 is as follows: When the first reversing valve 510 is energized and in the first state, the two-way solenoid reversing valve 411 is energized and in the left position. Oil flows through the first reversing valve 510, through the two-way solenoid reversing valve 411, and reaches the opening pressure of the first hydraulic lock 412, entering the rodless chambers of the outrigger cylinders 610 and lift cylinders 620. Due to the difference between the weight of the waste bin and the weight of the outriggers, the outrigger cylinder 610 extends first, followed by the lift cylinder 620. The oil then flows back through the rod chambers of the outrigger cylinders 610 and lift cylinders 620 to the main oil return line 320, and then through the oil return port of the return filter back to the oil tank 100, completing the actions of lifting the waste bin and extending the outriggers. When the first reversing valve 510 is energized and in the second state, oil flows out of the fuel tank 100, passes through the first reversing valve 510, and flows into the rod chamber of the lifting cylinder 620. Then, it flows back from the rodless chamber of the lifting cylinder 620 to the main oil return line 320 and then back to the fuel tank 100, and the waste bin is lowered. After the waste bin is lowered into place, the two-way solenoid reversing valve 411 is energized, that is, the two-way solenoid reversing valve 411 is in the left position. Oil flows through the first reversing valve 510, reaches the opening pressure of the first hydraulic lock 412, and flows into the rod chamber of the outrigger cylinder 610. Then, it passes through the rodless chamber of the outrigger cylinder 610, passes through the two-way solenoid reversing valve 411, flows back to the main oil return line 320, and then flows back to the fuel tank 100, executing the outrigger retraction action. When the first reversing valve 510 is in the third state, the two-way electromagnetic reversing valve 411 loses power and is in the right position, which is a two-way cutoff state. That is, oil cannot flow into or out of the outrigger oil circuit 410 and the lifting oil circuit 420. As the filling mechanism and the loading mechanism frequently operate with pressure, the two-way electromagnetic reversing valve 411 is in a de-energized state. That is, the two-way electromagnetic reversing valve 411 is in the right position. Even if oil leaks from the first reversing valve 510, it cannot pass through the two-way electromagnetic reversing valve 411 and cannot reach the opening condition of the first hydraulic lock 412. Therefore, the outrigger oil cylinder 610 does not extend, and the outrigger will not fall off.

[0047] See also Figure 2 In this embodiment, the second reversing valve 520, the third reversing valve 530, and the fourth reversing valve 540 are all three-position four-way reversing valves. The second reversing valve 520 has ports T2, P2, A2, and B2. The third reversing valve 530 has ports T3, P3, A3, and B3. The fourth reversing valve 540 has ports P4, A4, and B4. Ports P2, P3, and P4 are respectively connected to the main oil inlet line 310, and ports T2, T3, and T4 are respectively connected to the main oil return line 320. Ports A2, A3, and A4 and ports B2, B3, and B4 are respectively used to connect to the rodless chamber and rod chamber of the scraper cylinder 630, the slide cylinder 640, and the bucket tilting cylinder 650. When the second reversing valve 520 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 second reversing valve 520 is in the second state, the P2 port is connected to the B2 port, and the A2 port is connected to the T2 port; When the third reversing valve 530 is in the first state, the P3 port is connected to the A3 port, and the B3 port is connected to the T3 port; When the third reversing valve 530 is in the second state, the P3 port is in communication with the B3 port, and the A3 port is in communication with the T3 port.

[0048] When the fourth reversing valve 540 is in the first state, the P4 port is connected to the A4 port, and the B4 port is connected to the T4 port; When the fourth reversing valve 540 is in the second state, the P4 port is in communication with the B4 port, and the A4 port is in communication with the T4 port.

[0049] When any one of the second reversing valve 520 , the third reversing valve 530 , and the fourth reversing valve 540 is in the first state or the second state, the first reversing valve 510 is in the third state.

[0050] When the compression mechanism operates the slide forward to accumulate pressure, the scraper may open prematurely or the compression time may be insufficient due to the pressure of the slide or the loading mechanism. This reduces the compression force of the garbage and affects the compression density of the garbage, thereby reducing the loading capacity of the entire vehicle. In addition, the vibration of the loading mechanism during the loading process can cause garbage to spill, or generate impact or noise.

[0051] To resolve the above issues, please refer to Figure 2 The garbage truck hydraulic system 1000 in this embodiment further includes a second hydraulic lock 431, which is disposed between the second reversing valve 520 and the scraper cylinder 630; and / or, the second reversing valve 520 is a Y-type three-position four-way reversing valve. When the second reversing valve 520 is in the third state, the P2 port is disconnected, and the T2 port is simultaneously connected to the A2 port and the B2 port; and / or, the garbage truck hydraulic system 1000 further includes a third hydraulic lock 441, which is disposed between the third reversing valve 530 and the slide cylinder 640; and / or, the third reversing valve 530 is a Y-type three-position four-way reversing valve. When the third reversing valve 530 is in the third state, the P3 port is disconnected, and the T3 port is connected to the A3 port and the B3 port; and / or, the garbage truck hydraulic system 1000 also includes a fourth hydraulic lock 451, and the fourth hydraulic lock 451 is arranged between the fourth reversing valve 540 and the bucket turning cylinder 650; and / or, the fourth reversing valve 540 is a Y-type three-position four-way reversing valve. When the fourth reversing valve 540 is in the third state, the P4 port is disconnected, and the T4 port is connected to the A4 port and the B4 port.

[0052] In this embodiment, the second reversing valve 520, the third reversing valve 530, and the fourth reversing valve 540 are all Y-type three-position four-way reversing valves. Of course, the second reversing valve 520, the third reversing valve 530, and the fourth reversing valve 540 can also be other types of reversing valves depending on actual working conditions, and this is not limited here. The second reversing valve 520, the third reversing valve 530, and the fourth reversing valve 540 can be the same type of reversing valve, or different types of reversing valves can be used, and this is not limited here.

[0053] The filling mechanism performs a compound action, that is, the scraper cylinder 630 or the slide cylinder 640 or the barrel turning cylinder 650 operates, and at this time the second reversing valve 520 or the third reversing valve 530 or the fourth reversing valve 540 is in the first state or the second state.

[0054] When the second reversing valve 520 is in its third state, or neutral position, it blocks oil flow to prevent leakage from the second reversing valve 520 when other cylinders are operating in conjunction with it, which could cause the corresponding cylinders to actuate prematurely, resulting in insufficient filling time and reduced garbage compression density and loading capacity. Furthermore, the provision of a hydraulic lock allows for bidirectional pressure maintenance, reducing leakage when the second reversing valve 520 is in its third state, or neutral position. This allows the scraper cylinder 630 to exert a prolonged positive compressive force on the garbage during the filling process, resulting in a high garbage filling density and increased garbage loading capacity. Because the hydraulic lock, formed by the interlocking structure of two one-way valves, blocks oil flow when the third reversing valve 530 is in its third state, or neutral position, it also allows for bidirectional pressure maintenance, reducing leakage when the third reversing valve 530 is in its neutral position. This prevents the slide cylinder 640 from actuating under the reaction of the garbage when other cylinders are operating in conjunction with it, thus ensuring the effectiveness and efficiency of the filling mechanism. Since the hydraulic lock forms an interlocking structure through two one-way valves, the oil flow is blocked when the fourth reversing valve 540 is in the third state, that is, the neutral position, and the hydraulic lock can also achieve two-way pressure maintenance, reducing the leakage of the fourth reversing valve 540 in the neutral state, so that the barrel turning cylinder 650 will not move when other cylinders work in conjunction, thereby preventing shaking that causes garbage to spill or impact to generate noise.

[0055] In order to reduce the leakage when the second reversing valve 520 is in the middle position, the second reversing valve 520 in this embodiment is a Y-type three-position four-way valve. Figure 3 , Figure 3This diagram compares the scraper engagement pressures for the electromagnetic reversing valve in the O-shaped and Y-shaped positions, as provided in an embodiment of the present invention. ΔP1 represents the leakage pressure in the O-shaped position, while ΔP2 represents the leakage pressure in the Y-shaped position. The Y-shaped position significantly increases the time it takes to reach rated pressure compared to the O-shaped position, resulting in a longer scraper engagement time and slower scraper opening, which increases the garbage compression time, thereby increasing garbage density and, consequently, the loading capacity.

[0056] In certain embodiments, to reduce leakage when the third reversing valve 530 is in the neutral position, the third reversing valve 530 is a Y-shaped, three-position, four-way valve. Similarly, the slide oil circuit 440 is controlled by both a Y-shaped, three-position, four-way valve and a hydraulic lock. This prevents the slide from moving backward while the scraper is sliding, achieving precise positioning of the slide and ensuring both efficient and effective pressure filling.

[0057] In certain embodiments, to reduce leakage when the fourth reversing valve 540 is in the neutral position, the fourth reversing valve 540 is a Y-type, three-position, four-way valve. Similarly, the barrel turning oil circuit 450 is controlled by both a Y-type, three-position, four-way valve and a hydraulic lock. This prevents the barrel turning cylinder 650 from operating when other cylinders are in operation, thereby preventing the loading mechanism from shaking and causing garbage to spill, or generating impact or noise.

[0058] When the second reversing valve 520 is energized and in the first state, the oil flows from the main oil inlet circuit 310 to the second reversing valve 520 port, flows out through the A2 port, and flows to the second hydraulic lock 431. When the opening pressure of the second hydraulic lock 431 is reached, the oil flows to the rodless chamber of the scraper cylinder 630, and then passes through the rod chamber of the scraper cylinder 630, and flows back to the main oil return circuit 320 through the second reversing valve 520 port and the T2 port in sequence, and flows back to the oil tank 100 through the return oil port of the oil tank 100, performing the scraper scraping action. When the second reversing valve 520 is energized and in its second state, oil flows from the main oil inlet line 310 to the second reversing valve 520, sequentially passing through ports P2 and B2, and finally to the second hydraulic lock 431. Upon reaching the opening pressure of the second hydraulic lock 431, the oil flows to the rod chamber of the scraper cylinder 630. Then, through the rodless chamber of the scraper cylinder 630, it flows sequentially through the port of the second reversing valve 520 and port T2 back to the main oil return line 320, and finally back to the tank 100 through the oil return port, performing the scraper expansion operation. When the second reversing valve 520 is de-energized and in its third state (i.e., when the second reversing valve 520 is in a neutral position with pressure held), the second hydraulic lock 431 ensures virtually no leakage when the second reversing valve 520 is in the neutral position. This ensures that the scraper cylinder 630 maintains its compressive force on the garbage for a longer period of time during the filling process, ensuring garbage density and increasing loading capacity.

[0059] When the second reversing valve 520 is energized and in the first state, the oil flows from the main oil inlet circuit 310 to the second reversing valve 520 port, flows out through the A2 port, and flows to the second hydraulic lock 431. When the opening pressure of the second hydraulic lock 431 is reached, the oil flows to the rodless chamber of the scraper cylinder 630, and then passes through the rod chamber of the scraper cylinder 630, and flows back to the main oil return circuit 320 through the second reversing valve 520 port and the T2 port in sequence, and flows back to the oil tank 100 through the return oil port of the oil tank 100, performing the scraper scraping action. When the second reversing valve 520 is energized and in the second state, the oil flows from the main oil inlet circuit 310 to the second reversing valve 520, passes through the P2 port and the B2 port in sequence, and flows to the second hydraulic lock 431. When the opening pressure of the second hydraulic lock 431 is reached, the oil flows to the rod chamber of the scraper cylinder 630, and then passes through the rodless chamber of the scraper cylinder 630, passes through the second reversing valve 520 port and the T2 port in sequence and flows back to the main oil return circuit 320, and flows back to the oil tank 100 through the return oil port of the oil tank 100 to perform the scraper opening action. When the second reversing valve 520 loses power and is in the third state, that is, the second reversing valve 520 is in the neutral position and is holding pressure, the second hydraulic lock 431 is provided, so that there is almost no leakage when the second reversing valve 520 is in the neutral position, so as to ensure that the scraper cylinder 630 will not move prematurely during the filling process, and the scraper will not open prematurely, so as to ensure that the compression force on the garbage is maintained for a longer time, and the garbage filling density is guaranteed, thereby increasing the loading capacity.

[0060] When the third reversing valve 530 is energized and is in the first state, the oil flows from the main oil inlet circuit 310 to the third reversing valve 530 port, flows out through the A3 port, and flows to the third hydraulic lock 441. When the opening pressure of the third hydraulic lock 441 is reached, the oil flows to the rodless chamber of the skateboard cylinder 640, and then passes through the rod chamber of the skateboard cylinder 640, and flows back to the main oil return circuit 320 through the third reversing valve 530 port and the T3 port in sequence, and flows back to the oil tank 100 through the return oil port of the oil tank 100, executing the upward action of the skateboard. When the third reversing valve 530 is energized and in its second state, oil flows from the main oil inlet line 310 to the third reversing valve 530, sequentially passing through ports P3 and B3, and finally to the third hydraulic lock 441. Upon reaching the opening pressure of the third hydraulic lock 441, the oil flows to the rod chamber of the slide plate cylinder 640. Then, through the rodless chamber of the slide plate cylinder 640, it flows sequentially through the ports of the third reversing valve 530 and T3 back to the main oil return line 320, and finally back to the tank 100 through the oil return port, causing the slide plate to descend. When the third reversing valve 530 is de-energized and in its third state, i.e., when the third reversing valve 530 is in a neutral position with pressure held, the third hydraulic lock 441 ensures virtually no leakage when the third reversing valve 530 is in the neutral position. This prevents the slide plate cylinder 640 from prematurely actuating during the packing process, ensuring a longer holding time for the compressive force on the garbage, maintaining garbage packing density, and thus increasing loading capacity.

[0061] When the fourth reversing valve 540 is energized and is in the first state, the oil flows from the main oil inlet circuit 310 to the fourth reversing valve 540 port, flows out through the A4 port, and flows to the fourth hydraulic lock 451. When the opening pressure of the fourth hydraulic lock 451 is reached, the oil flows to the rodless chamber of the barrel-turning cylinder 650, and then passes through the rod chamber of the barrel-turning cylinder 650, and flows back to the main oil return circuit 320 through the fourth reversing valve 540 port and the T4 port in sequence, and flows back to the oil tank 100 through the return oil port of the oil tank 100, performing the barrel-turning upward flipping action. When the fourth reversing valve 540 is energized and in its second state, oil flows from the main oil inlet line 310 to the fourth reversing valve 540, sequentially passing through ports P4 and B4, and finally to the fourth hydraulic lock 451. Upon reaching the opening pressure of the fourth hydraulic lock 451, the oil flows to the rod chamber of the bucket-turning cylinder 650. Then, through the rodless chamber of the bucket-turning cylinder 650, it flows sequentially through the port of the fourth reversing valve 540 and port T4 back to the main oil return line 320, and finally back to the tank 100 through the oil return port, performing the downward tilting of the bucket. When the fourth reversing valve 540 is de-energized and in its fourth state (i.e., when the fourth reversing valve 540 is in a neutral position with pressure built up), the fourth hydraulic lock 451 ensures virtually no leakage when the fourth reversing valve 540 is in its neutral position, preventing premature actuation of the bucket-turning cylinder 650 and thus preventing vibration of the loading mechanism that could cause spillage of garbage, impact, or noise.

[0062] In addition, in order to control the efficiency of the scraper cylinder 630 or the slide cylinder 640, please refer to Figure 2 The garbage truck hydraulic system 1000 in this embodiment also includes a second relief valve 810, one end of which is connected to the oil return port of the fuel tank 100 and the other end of which is connected to the rodless chamber of the scraper cylinder 630. Alternatively, the garbage truck hydraulic system 1000 also includes a third relief valve 820, one end of which is connected to the oil return port of the fuel tank 100 and the other end of which is connected to the rodless chamber of the slide cylinder 640. The second relief valve 810 ensures the reaction force of the garbage compression density, ensuring sufficient scraper compression force. The third relief valve 820 ensures the set pressure value at the slide, ensuring sufficient scraper reaction force and preventing premature opening. Both the second relief valve 810 and the third relief valve 820 can be provided simultaneously, or alternatively, only one of them can be provided, depending on actual usage requirements and not limited herein. In addition, a relief valve may be provided on the barrel turning oil circuit 450 , one end of the relief valve being connected to the oil return port of the oil tank 100 , and the other end of the relief valve being connected to the rodless chamber of the barrel turning cylinder 650 .

[0063] To facilitate automated control, the first reversing valve 510, the second reversing valve 520, the third reversing valve 530, and the fourth reversing valve 540 in this embodiment are all electromagnetic reversing valves. Of course, the first reversing valve 510, the second reversing valve 520, the third reversing valve 530, and the fourth reversing valve 540 can also be manual reversing valves, motorized reversing valves, electro-hydraulic reversing valves, etc., without limitation herein.

[0064] Please continue reading Figure 2The garbage truck hydraulic system 1000 in this embodiment further includes a first relief valve 700, which is disposed between the main oil inlet 310 and the main oil return 320; and / or the garbage truck hydraulic system 1000 further includes a fifth reversing valve 900, which is disposed between the main oil inlet 310 and the main oil return 320. The garbage truck hydraulic system 1000 in this embodiment may be provided with either the first relief valve 700 or the fifth reversing valve 900 alone. Alternatively, the garbage truck hydraulic system 1000 may be provided with both the first relief valve 700 and the fifth reversing valve 900 simultaneously, without limitation. The provision of the first relief valve 700 ensures the safety and pressure stability of the entire garbage truck hydraulic system 1000. By limiting pressure increases, the first relief valve 700 prevents damage to components and circuits within the garbage truck hydraulic system 1000 due to excessive pressure. Furthermore, the first relief valve 700 maintains the pressure of the garbage truck's hydraulic system 1000 within a certain range, preventing system instability due to excessive pressure. By providing the fifth reversing valve 900, when energized, the oil in the fuel tank 100 flows directly from the main oil inlet line 310 through the fifth reversing valve 900 to the main oil return line 320, and then back to the fuel tank 100, achieving unloading. This unloading oil circuit allows the oil pump 200 to operate with near-zero power loss when the oil pump 200 is not frequently cycled, thereby reducing power loss and system heat generation.

[0065] To improve the control accuracy and response speed of the two-way solenoid reversing valve 411, the garbage truck hydraulic system 1000 in this embodiment also includes a lifting oil circuit 420, which is connected in parallel with the outrigger oil circuit 410. A lifting cylinder 620 is disposed in this lifting oil circuit 420. A first reversing valve 510 enables one of the rod chamber and the rodless chamber of the lifting cylinder 620 to communicate with the main oil inlet circuit 310, and the other to communicate with the main oil return circuit 320. The vehicle body includes a garbage bin, a subframe, and outriggers. The lifting cylinder 620 is connected between the subframe and the garbage bin and is used to control the lifting and lowering of the garbage bin, thereby enabling garbage loading and unloading. The subframe is equipped with a proximity switch. When the first reversing valve 510 is connected to the main oil inlet circuit 310, the two-way electromagnetic reversing valve 411 is energized, the outrigger oil circuit 410 is connected first, the outrigger oil cylinder 610 extends and drives the outrigger to extend, and after the outrigger oil cylinder 610 is extended into place, the lifting oil circuit 420 is connected, the lifting oil cylinder 620 extends and drives the trash bin to lift; when the first reversing valve 510 is connected to the main oil return circuit 320, the lifting oil circuit 420 is connected first, the lifting oil cylinder 620 retracts and drives the trash bin to descend; when the trash bin descends to contact with the subframe, the proximity switch is energized, controlling the two-way electromagnetic reversing valve 411 to be energized, the outrigger oil circuit 410 is connected, the outrigger oil cylinder 610 retracts and drives the outrigger to retract.

[0066] In addition, the garbage truck hydraulic system 1000 in this embodiment is equipped with a filter at the inlet of the oil tank 100. This filter removes impurities from the oil, such as metal shavings, dust, and dirt. Clean oil reduces wear on pumps, valves, and other components, thereby extending the service life of the equipment and reducing the frequency of repairs and component replacements. Furthermore, impurities in the oil can affect fluidity and, in turn, the efficiency of the garbage truck hydraulic system 1000. Using a filter maintains oil cleanliness, ensuring that the garbage truck hydraulic system 1000 operates at optimal conditions and improving overall efficiency. Furthermore, the accumulation of contaminants can cause system failures, such as oil line blockages and component seizures. Installing a filter can effectively reduce the occurrence of these failures and improve system reliability. Of course, the filter can also be installed at the outlet of the oil tank 100, or at both the inlet and outlet of the oil tank 100, without limitation here.

[0067] An embodiment of the present invention further provides a hydraulic control method for a garbage truck, which is applied to the garbage truck hydraulic system 1000 in any of the above embodiments or the garbage truck in any of the above embodiments. The control method includes: The hydraulic oil is pumped from the oil tank 100 to the main oil inlet 310 by the oil pump 200; Control at least one of the first reversing valve 510, the second reversing valve 520, the third reversing valve 530, and the fourth reversing valve 540 to operate, so that the main oil inlet line 310 is connected to the rod chamber or rodless chamber of the corresponding outrigger cylinder 610, the scraper cylinder 630, the slide cylinder 640, or the bucket cylinder 650, and the main oil return line 320 is connected to the corresponding rodless chamber or rod chamber; When the scraper cylinder 630, the skateboard cylinder 640 or the bucket-turning cylinder 650 performs a compound telescopic action, that is, when at least one of the scraper oil circuit 430, the skateboard oil circuit 440 and the bucket-turning oil circuit 450 is connected to the main oil inlet circuit 310 and the main oil return circuit 320, the first reversing valve 510 is controlled to switch to the third state, and the two-way electromagnetic reversing valve 411 is controlled to be in the right position, so that the rodless chamber of the support leg cylinder 610 is locked, thereby preventing the support leg cylinder 610 from extending.

[0068] That is, the scraper cylinder 630, the slide plate cylinder 640, or the bucket-turning cylinder 650 can be operated simultaneously, or only one or two of them can be operated. By switching the state of the reversing valve corresponding to each cylinder, at least one of the scraper oil circuit 430, the slide plate oil circuit 440, and the bucket-turning oil circuit 450 can be controlled to communicate with the main oil inlet circuit 310 and the main oil return circuit 320, thereby controlling the operation of at least one of the scraper cylinder 630, the slide plate cylinder 640, or the bucket-turning cylinder 650. During the combined operation of the outrigger cylinder 610, the first reversing valve 510 is in the neutral position, and the two-way electromagnetic reversing valve 411 is in the de-energized and bidirectionally blocked state, keeping the outrigger cylinder 610 locked to prevent the outrigger from falling.

[0069] In addition, the control method also includes: when the outrigger cylinder 610 needs to be actuated, controlling the two-way electromagnetic reversing valve 411 to be in the left position, and controlling the first reversing valve 510 to switch to the first state or the second state to achieve extension or retraction of the outrigger cylinder 610.

[0070] In order to facilitate the control of the action sequence of the lifting cylinder 620 and the outrigger cylinder 610 and improve the safety of the garbage truck during operation, the garbage truck hydraulic system 1000 in this embodiment also includes a lifting oil circuit 420. The lifting oil circuit 420 is connected in parallel with the outrigger oil circuit 410. The lifting cylinder 620 is arranged in the lifting oil circuit 420. The first reversing valve 510 can make one of the rod chamber and the rodless chamber of the lifting cylinder 620 conductive with the main oil inlet circuit 310, and the other conductive with the main oil return circuit 320. The vehicle body includes a garbage bin, a subframe and outriggers. The lifting cylinder 620 is connected between the subframe and the garbage bin. The subframe is provided with a proximity switch; the proximity switch is used to detect the relative position of the garbage bin and the subframe. The control method also includes: When the first reversing valve 510 is switched to be in communication with the main oil inlet line 310, the two-way electromagnetic reversing valve 411 is controlled to be energized, so that the two ports of the two-way electromagnetic reversing valve 411 are in a state of being energized and connected, so that the outrigger oil circuit 410 is preferentially connected, driving the outrigger oil cylinder 610 to extend, thereby driving the outrigger to extend; after the outrigger is fully extended, the lifting oil circuit 420 is connected, driving the lifting oil cylinder 620 to extend and drive the garbage bin to be lifted; When the first reversing valve 510 is connected to the main oil return circuit 320, the lifting oil circuit 420 is connected first, the lifting cylinder 620 retracts and drives the trash can to descend; when the trash can descends to contact the sub-frame, the proximity switch detects that it is in place and triggers the two-way electromagnetic reversing valve 411 to be energized, so that the outrigger oil circuit 410 is connected, driving the outrigger cylinder 610 to retract and drive the outrigger to retract.

[0071] Specifically, the lift cylinder 620 and the outrigger cylinder 610 are controlled by the same first reversing valve 510, with time-sharing operation achieved through the oil circuit on-off sequence. Due to the significant weight difference between the waste bin and the outriggers, the extension of the outrigger cylinder 610 and the lifting of the lift cylinder 620 are controlled sequentially, with the lift cylinder 620 activating only after the outriggers are fully extended. When the waste bin is lowered, the lift cylinder 620 retracts first. Once the proximity switch detects the return of the waste bin—that is, when the proximity switch detects the waste bin has descended to contact the subframe—it sends a signal to energize the two-way solenoid reversing valve 411. Only then does the outrigger oil circuit 410 open, allowing the outrigger cylinder 610 to retract, driving the outriggers in turn. The two-way solenoid reversing valve 411 remains energized during the outrigger extension or retraction phase and de-energized during the remaining phases to lock the outrigger cylinder 610.

[0072] In summary, the hydraulic system 1000 of the garbage truck includes a fuel tank 100, an oil pump 200, a main oil inlet circuit 310, a main oil return circuit 320, a first reversing valve 510, a second reversing valve 520, a third reversing valve 530, a fourth reversing valve 540, an outrigger oil circuit 410, a scraper oil circuit 430, a slide oil circuit 440, a bucket oil circuit 450 and a two-way electromagnetic reversing valve 411; the outlet of the fuel tank 100 is interconnected with the oil suction port of the oil pump 200, and the oil outlet of the oil pump 200 is interconnected with the main oil inlet circuit 310. The oil return port of the oil tank 100 is interconnected with the main oil return line 320; the first reversing valve 510, the second reversing valve 520, the third reversing valve 530 and the fourth reversing valve 540 are all connected in parallel between the main oil inlet line 310 and the main oil return line 320; the outrigger oil cylinder 610 is provided in the outrigger oil line 410, and the first reversing valve 510 can make one of the rod chamber and the rodless chamber of the outrigger oil cylinder 610 communicate with the main oil inlet line 310 and the other communicate with the main oil return line 320; the scraper oil cylinder 630 is provided in the scraper oil line 43 0, the second reversing valve 520 can make one of the rod chamber and the rodless chamber of the scraper cylinder 630 communicate with the main oil inlet 310, and the other one communicates with the main oil return 320; the slide plate cylinder 640 is set in the slide plate oil circuit 440, the third reversing valve 530 can make one of the rod chamber and the rodless chamber of the slide plate cylinder 640 communicate with the main oil inlet 310, and the other one communicates with the main oil return 320; the barrel turning cylinder 650 is set in the barrel turning oil circuit 450, and the fourth reversing valve 540 can make the barrel turning cylinder 65 0, one of the rod chamber and the rodless chamber is connected to the main oil inlet circuit 310, and the other is connected to the return oil pipeline; the two-way electromagnetic reversing valve 411 is arranged between the first reversing valve 510 and the rodless chamber of the outrigger cylinder 610; under the drive of the oil pump 200, the scraper cylinder 630, the skateboard cylinder 640, and the bucket turning cylinder 650 perform a compound action. When any one of the scraper cylinder 630, the skateboard cylinder 640, and the bucket turning cylinder 650 performs a compound telescopic action, the outrigger cylinder 610 remains locked. By setting up a two-way electromagnetic reversing valve 411, when other oil circuits are in combined action and the first reversing valve 510 is in the neutral position and the first reversing valve 510 has internal leakage, leakage in the outrigger oil circuit 410 can be prevented, thereby preventing the outrigger oil cylinder 610 from extending when the outrigger oil circuit 410 is not connected with the main oil inlet circuit 310 and the main oil return circuit 320, resulting in the outrigger falling off, thereby ensuring the driving safety of the garbage truck and improving reliability.

[0073] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the scope of protection of the present invention.

Claims

1. A hydraulic system for a garbage truck, characterized in that: include: An oil tank (100), an oil pump (200), a main oil inlet circuit (310), and a main oil return circuit (320), wherein the oil outlet of the oil pump (200) is in communication with the main oil inlet circuit (310), and the oil return port of the oil tank (100) is in communication with the main oil return circuit (320); a first reversing valve (510), a second reversing valve (520), a third reversing valve (530), and a fourth reversing valve (540); the first reversing valve (510), the second reversing valve (520), the third reversing valve (530), and the fourth reversing valve (540) are all connected in parallel between the main oil inlet circuit (310) and the main oil return circuit (320); The outrigger oil circuit (410), the scraper oil circuit (430), the slide plate oil circuit (440), and the barrel turning oil circuit (450) are provided. The outrigger oil cylinder (610) is provided in the outrigger oil circuit (410); the scraper oil cylinder (630) is provided in the scraper oil circuit (430); the slide plate oil cylinder (640) is provided in the slide plate oil circuit (440); and the barrel turning oil cylinder (650) is provided in the barrel turning oil circuit (450). The first reversing valve (510), the second reversing valve (520), the third reversing valve (530) and the fourth reversing valve (540) are respectively capable of connecting one of the rod chamber and the rodless chamber of the outrigger cylinder (610), the scraper cylinder (630), the slide cylinder (640) and the bucket turning cylinder (650) to the main oil inlet circuit (310), and the other to the main oil return circuit (320); A two-way electromagnetic reversing valve (411), the two-way electromagnetic reversing valve (411) is arranged between the first reversing valve (510) and the rodless chamber of the outrigger oil cylinder (610); under the drive of the oil pump (200), the scraper oil cylinder (630), the slide oil cylinder (640), and the bucket turning oil cylinder (650) perform a compound action, and when any one of the scraper oil cylinder (630), the slide oil cylinder (640), and the bucket turning oil cylinder (650) performs a compound telescopic action, the outrigger oil cylinder (610) remains locked.

2. The hydraulic system for a garbage truck according to claim 1, wherein: The two-way electromagnetic reversing valve (411) has a left position and a right position. When the two-way electromagnetic reversing valve (411) is in the left position, the two ports of the two-way electromagnetic reversing valve (411) are electrically connected; when the two-way electromagnetic reversing valve (411) is in the right position, the two-way electromagnetic reversing valve (411) is de-energized and bidirectionally cut off.

3. The hydraulic system of a garbage truck according to claim 2, characterized in that: The first reversing valve (510) is an O-type three-position four-way reversing valve having ports T1, P1, A1, and B1, the P1 port being connected to the main oil inlet circuit (310), the T1 port being connected to the main oil return circuit (320), and the A1 port and the B1 port being used to connect the rodless chamber and the rod chamber of the outrigger oil cylinder (610), respectively; When the first reversing valve (510) 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 first reversing valve (510) is in the second state, the P1 port is connected to the B1 port, and the A1 port is connected to the T1 port; When the first reversing valve (510) is in the third state, the P1 port is not in communication with the A1 port and the B1 port, and the T1 port is not in communication with the A1 port and the B1 port; When the two-way electromagnetic reversing valve (411) is in the right position, the first reversing valve (510) is in the third state.

4. The hydraulic system for a garbage truck according to claim 3, wherein: The second reversing valve (520), the third reversing valve (530), and the fourth reversing valve (540) are all three-position four-way reversing valves. The second reversing valve (520) has ports T2, P2, A2, and B2. The third reversing valve (530) has ports T3, P3, A3, and B3. The fourth reversing valve (540) has ports T4, P4, A4, and B4. The ports P2, P3, and P4 are respectively connected to the main oil inlet circuit (310). The ports T2, T3, and T4 are respectively connected to the main oil return circuit (320). The ports A2, A3, and A4 and the ports B2, B3, and B4 are respectively used to connect the rodless chamber and the rod chamber of the scraper cylinder (630), the slide cylinder (640), and the bucket turning cylinder (650). When the second reversing valve (520) 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 second reversing valve (520) is in the second state, the P2 port is connected to the B2 port, and the A2 port is connected to the T2 port; When the third reversing valve (530) is in the first state, the P3 port is connected to the A3 port, and the B3 port is connected to the T3 port; When the third reversing valve (530) is in the second state, the P3 port is connected to the B3 port, and the A3 port is connected to the T3 port; When the fourth reversing valve (540) is in the first state, the P4 port is connected to the A4 port, and the B4 port is connected to the T4 port; When the fourth reversing valve (540) is in the second state, the P4 port is connected to the B4 port, and the A4 port is connected to the T4 port; When any one of the second reversing valve (520), the third reversing valve (530), and the fourth reversing valve (540) is in the first state or the second state, the first reversing valve (510) is in the third state.

5. The hydraulic system for a garbage truck according to claim 1, characterized in that: The garbage truck hydraulic system (1000) further comprises a first hydraulic lock (412), wherein the first hydraulic lock (412) is arranged between the outrigger oil cylinder (610) and the first reversing valve (510).

6. The hydraulic system for a garbage truck according to claim 1, characterized in that: The garbage truck hydraulic system (1000) further includes a lifting oil circuit (420), wherein the lifting oil circuit (420) is connected in parallel with the outrigger oil circuit (410), and a lifting oil cylinder (620) is arranged in the lifting oil circuit (420). The first reversing valve (510) is capable of connecting one of the rod chamber and the rodless chamber of the lifting oil cylinder (620) to the main oil inlet circuit (310), and the other to the main oil return circuit (320). A balancing valve (421) is provided between the lifting oil cylinder (620) and the first reversing valve (510).

7. The hydraulic system for a garbage truck according to claim 1, characterized in that: The garbage truck hydraulic system (1000) further comprises a second hydraulic lock (431), wherein the second hydraulic lock (431) is arranged between the second reversing valve (520) and the scraper cylinder (630); and / or, the second reversing valve (520) is a Y-type three-position four-way reversing valve, and when the second reversing valve (520) is in the third state, the P2 port is disconnected, and the A2 port and the B2 port are both connected to the T2 port; and / or, The garbage truck hydraulic system (1000) further comprises a third hydraulic lock (441), wherein the third hydraulic lock (441) is arranged between the third reversing valve (530) and the slide plate cylinder (640); and / or, the third reversing valve (530) is a Y-type three-position four-way reversing valve, and when the third reversing valve (530) is in the third state, the P3 port is disconnected, and the A3 port and the B3 port are both connected to the T3 port; and / or, The garbage truck hydraulic system (1000) further comprises a fourth hydraulic lock (451), wherein the fourth hydraulic lock (451) is arranged between the fourth reversing valve (540) and the bucket turning cylinder (650); And / or, the fourth reversing valve (540) is a Y-type three-position four-way reversing valve, and when the fourth reversing valve (540) is in the third state, the P4 port is disconnected, and the A4 port and the B4 port are both connected to the T4 port.

8. The hydraulic system for a garbage truck according to claim 1, characterized in that: The garbage truck hydraulic system (1000) further comprises a first overflow valve (700), the first overflow valve (700) being arranged between the main oil inlet circuit (310) and the main oil return circuit (320); and / or, The garbage truck hydraulic system (1000) further comprises a fifth reversing valve (900), wherein the fifth reversing valve (900) is arranged between the main oil inlet circuit (310) and the main oil return circuit (320).

9. A garbage truck, characterized in that: It comprises a vehicle body and a garbage truck hydraulic system (1000) according to any one of claims 1 to 8, wherein the garbage truck hydraulic system (1000) is arranged on the vehicle body.

10. A hydraulic control method for a garbage truck, applied to the hydraulic system of a garbage truck according to claims 1 to 8 or the garbage truck according to claim 9, characterized in that: The control method includes: Pumping hydraulic oil from the oil tank (100) to the main oil inlet (310) via the oil pump (200); Controlling the operation of at least one of the first reversing valve (510), the second reversing valve (520), the third reversing valve (530) and the fourth reversing valve (540) so that the main oil inlet circuit (310) is connected to the rod chamber or rodless chamber of the corresponding outrigger cylinder (610), the scraper cylinder (630), the slide cylinder (640) or the bucket turning cylinder (650), and at the same time the main oil return circuit (320) is connected to the corresponding rodless chamber or rod chamber; When the scraper cylinder (630), the slide plate cylinder (640) or the bucket-turning cylinder (650) performs a compound telescopic action, that is, when at least one of the scraper oil circuit (430), the slide plate oil circuit (440) and the bucket-turning oil circuit (450) is connected to the main oil inlet circuit (310) and the main oil return circuit (320), the first reversing valve (510) is controlled to switch to the third state, and the two-way electromagnetic reversing valve (411) is controlled to be in the right position, so that the rodless chamber of the support leg cylinder (610) is locked, thereby preventing the support leg cylinder (610) from extending.

11. The hydraulic control method for a garbage truck according to claim 10, characterized in that: The control method further includes: When the outrigger oil cylinder (610) needs to be actuated, the two-way electromagnetic reversing valve (411) is controlled to be in the left position, and the first reversing valve (510) is controlled to switch to the first state or the second state to achieve the extension or retraction of the outrigger oil cylinder (610).

12. The hydraulic control method for a garbage truck according to claim 10 or 11, characterized in that: The garbage truck hydraulic system (1000) further includes a lifting oil circuit (420), the lifting oil circuit (420) being connected in parallel with the outrigger oil circuit (410), a lifting oil cylinder (620) being provided in the lifting oil circuit (420), and the first reversing valve (510) being capable of causing one of the rod chamber and the rodless chamber of the lifting oil cylinder (620) to be in communication with the main oil inlet circuit (310), and the other to be in communication with the main oil return circuit (320); the vehicle body includes a garbage bin, a subframe, and outriggers, the lifting oil cylinder (620) being connected between the subframe and the garbage bin, and the subframe being provided with a proximity switch; The proximity switch is used to detect the relative position of the trash bin and the subframe; The control method further includes: When the first reversing valve (510) is switched to be connected to the main oil inlet circuit (310), the two-way electromagnetic reversing valve (411) is controlled to be energized, so that the two-way electromagnetic reversing valve (411) is in a state where both ports are energized and connected, so that the outrigger oil circuit (410) is preferentially connected, and the outrigger oil cylinder (610) is driven to extend, thereby driving the outrigger to extend; after the outrigger is fully extended, the lifting oil circuit (420) is connected, driving the lifting oil cylinder (620) to extend and drive the garbage bin to be lifted; When the first reversing valve (510) is in communication with the main oil return circuit (320), the lifting oil circuit (420) is firstly opened, the lifting oil cylinder (620) retracts and drives the trash bin to descend; when the trash bin descends to contact the sub-frame, the proximity switch detects that it is in position and triggers the two-way electromagnetic reversing valve (411) to be energized, thereby opening the outrigger oil circuit (410), driving the outrigger oil cylinder (610) to retract and driving the outrigger to retract.

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