Hydraulic control system and refuse compactor

Abstract

The utility model provides a kind of hydraulic control system and garbage compression equipment, it is related to garbage disposal equipment technical field.The hydraulic control system includes compression cylinder, oil tank, oil pump and control valve group, compression cylinder is used to drive load in first direction movement, compression cylinder has rod cavity and rodless cavity;Wherein, first direction and horizontal direction exist angle.Control valve group is connected in oil pump, oil tank, rod cavity and rodless cavity.Control valve group when in first state, can cut off oil pump output, and make the hydraulic oil of rod cavity flow at the same time make hydraulic oil flow to rodless cavity, to make compression cylinder elongate under load gravity.Thereby in garbage compression process, energy waste can be reduced, compression cylinder's elongation speed can also be improved to improve garbage compression efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sanitation equipment technology, and more specifically, to a hydraulic control system and a garbage compression device. Background Technology

[0002] A vertical waste compression station is a waste processing device that uses a pressure head, driven by a hydraulic cylinder, to compress waste poured into a compression chamber into blocks from top to bottom. The compression process typically involves several cycles of "pouring waste into the compression chamber – the hydraulic cylinder extending to push the pressure head downwards to compress the waste – the hydraulic cylinder shortening to move the pressure head upwards – then pouring waste back into the compression chamber," compressing loose waste into high-density blocks.

[0003] In the existing technology, the compression cylinder needs to be driven by the oil pump of the hydraulic control system throughout the entire extension process, which can easily lead to energy waste and slow extension speed of the compression cylinder, resulting in low compression efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic control system and a waste compression device that can reduce energy waste and increase the extension speed of the compression cylinder, thereby improving waste compression efficiency.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this application provides a hydraulic control system, comprising: A hydraulic cylinder is used to drive a load to move in a first direction. The hydraulic cylinder has a rod-type chamber and a rodless chamber. The first direction is at an angle to the horizontal direction. tank; Oil pump; A control valve assembly, which is connected to the oil pump, the oil tank, the rod chamber, and the rodless chamber; In the first state, the control valve assembly can cut off the output of the oil pump and allow the hydraulic oil to flow out of the rod chamber while simultaneously flowing to the rodless chamber, so that the compression cylinder can extend under the load.

[0006] In an optional embodiment, the hydraulic control system further includes a first oil circuit and a second oil circuit; the control valve group includes a directional valve, the directional valve is connected to the oil pump and the oil tank, and the rodless chamber is connected to the directional valve through the first oil circuit, and the rod chamber is connected to the directional valve through the second oil circuit; When the reversing valve is in the first working position, it enables both the first oil circuit and the second oil circuit to be connected to the oil tank, and cuts off the oil pump from supplying hydraulic oil to the compression cylinder, so that the compression cylinder extends under the action of the load gravity. When the reversing valve is in the second working position, it can connect the oil pump and the first oil circuit while simultaneously connecting the second oil circuit to the oil tank, so that the oil pump can supply hydraulic oil to the rodless chamber, causing the compression cylinder to extend. When the reversing valve is in the third working position, it can connect the oil pump and the second oil circuit while simultaneously connecting the first oil circuit and the oil tank, so that the oil pump can supply hydraulic oil to the rod chamber, thereby shortening the compression cylinder.

[0007] In an optional embodiment, the control valve assembly further includes a balance valve, which is disposed in the second oil circuit, and the pilot port of the balance valve is connected to the first oil circuit through a fourth oil circuit. The balancing valve is used to maintain the load when the reversing valve is in the first operating position.

[0008] In an optional embodiment, the control valve assembly further includes a second directional valve and a third oil passage; the two ends of the third oil passage are respectively connected to the rod chamber and the rodless chamber; the second directional valve is disposed in the third oil passage; The second directional valve has an open position and a closed position; When the control valve group is in the first state, the second directional valve is in the open working position, and when the directional valve is in the first working position, the rod chamber and the rodless chamber are connected through the third oil circuit; When the second directional valve is in the second or third working position, it is in the closed working position to block the third oil circuit.

[0009] In an optional embodiment, the first end of the third oil passage is connected to the first oil passage; the second end of the third oil passage is connected to the portion of the second oil passage located between the balance valve and the rod chamber.

[0010] In an optional embodiment, the hydraulic control system further includes a check valve assembly and a fifth oil circuit; One end of the fifth oil circuit is connected to the oil tank, and the other end is connected to the rodless cavity; The one-way valve assembly is located in the fifth oil circuit, and the one-way valve assembly can connect the rodless chamber with the oil tank when the compression cylinder extends.

[0011] In an optional embodiment, the one-way valve assembly is a hydraulically controlled one-way valve, and the control port of the hydraulically controlled one-way valve is connected to the second oil circuit through the sixth oil circuit.

[0012] In an optional embodiment, the fourth oil circuit is provided with a first throttle valve.

[0013] In an optional embodiment, the third oil circuit is provided with a second throttle valve.

[0014] Secondly, this application also provides a waste compression device, including a device body, a mounting platform, a pressure head, and a hydraulic control system as described in any of the above optional embodiments; One end of the compression cylinder is connected to the mounting platform, the pressure head is mounted on the other end of the compression cylinder, and the oil tank is mounted on the mounting platform; The installation platform is located on the device body.

[0015] In an optional embodiment, the oil tank is located above the compression cylinder.

[0016] In an optional implementation, the waste compaction device further includes sensors and a controller; The sensor, the oil pump, and the control valve group are all connected to the controller, and the sensor is used to detect the extension position of the compression cylinder; The controller is able to control the control valve group to switch to the first state after receiving the extension command of the compression cylinder; The controller can also determine whether the compression cylinder has extended to a first preset position based on the extension position of the compression cylinder detected by the sensor. The controller can also control the oil pump to run after the compression cylinder extends to the first preset position, and control the control valve group to connect the oil pump to the rodless chamber and the rod chamber to the oil tank at the same time, so that the oil pump supplies hydraulic oil to the rodless chamber, causing the compression cylinder to extend.

[0017] The beneficial effects of the hydraulic control system and waste compression equipment provided in this embodiment of the invention include: This application, by setting up a control valve assembly and connecting it to the oil pump, oil tank, and the rod-side and rodless sides of the compression cylinder, allows the control valve assembly to cut off the oil pump output in the first state. Simultaneously, it allows hydraulic oil to flow from the rod-side chamber to the rodless side, enabling the compression cylinder to extend under load without requiring the oil pump to supply oil, thus achieving better energy savings. Furthermore, it allows for rapid extension of the hydraulic cylinder. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the waste compression station provided in this embodiment; Figure 2 This is a schematic diagram of the pressure head assembly provided in this embodiment; Figure 3 This is a schematic diagram of the hydraulic flow path of the hydraulic control system provided in this embodiment; Figure 4 This is a schematic diagram of the circuit module connection of the pressure head assembly provided in this embodiment; Figure 5 This is a flowchart illustrating the control method of the hydraulic control system provided in this embodiment; Figure 6 This is another schematic diagram of the control method of the hydraulic control system provided in this embodiment.

[0020] Icons: 100 - Hydraulic control system; 110 - Compression cylinder; 111 - Rod chamber; 112 - Rodless chamber; 120 - Oil tank; 130 - Oil pump; 140 - Control valve assembly; 141 - Directional valve; 142 - P port; 143 - T port; 144 - A port; 145 - B port; 150 - First oil circuit; 160 - Second oil circuit; 170 - Second directional valve; 180 - Third oil circuit; 190 - Balance valve; 191 - Pilot port; 2 10-Fourth oil circuit; 220-First throttle valve; 230-Second throttle valve; 240-Check valve assembly; 250-Fifth oil circuit; 260-Sensor; 270-Controller; 280-Sixth oil circuit; 300-Pressure head assembly; 310-Mounting platform; 320-Pressure head; 500-Waste compression equipment; 510-Equipment body; 511-First compression station; 512-Maintenance station; 513-Second compression station; 514-Railway. Detailed Implementation

[0021] A vertical waste compression station is a waste processing device that uses a compression head, driven by a hydraulic cylinder, to compress waste poured into a compression chamber into blocks from top to bottom. The compression process typically involves several cycles of "pouring waste into the compression chamber – the hydraulic cylinder extending to push the compression head downwards to compress the waste – the hydraulic cylinder shortening to move the compression head upwards – then pouring waste back into the compression chamber," compressing loose waste into high-density blocks.

[0022] In the existing technology, the compression cylinder needs to be driven by the oil pump of the hydraulic control system throughout the entire extension process, which can easily lead to energy waste and slow extension speed of the compression cylinder, resulting in low compression efficiency.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0028] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0029] Please refer to Figure 1 and Figure 2 This embodiment provides a waste compression device 500, which can be a vertical waste compression station that can compress waste poured into the waste compression chamber into blocks, thereby facilitating further transportation and processing.

[0030] Please refer to Figure 1 and Figure 2In this embodiment, the waste compression device 500 includes a device body 510, a mounting platform 310, a pressure head 320, and a hydraulic control system 100. The mounting platform 310 is mounted on a track 514, and can drive the pressure head to move horizontally along the track. One end of the compression cylinder 110 of the hydraulic control system 100 is connected to the mounting platform 310, and the pressure head 320 is mounted on the other end of the compression cylinder 110. The extension of the compression cylinder 110 can drive the pressure head 320 to move from top to bottom to compress the waste.

[0031] Please refer to Figure 1 and Figure 2 In this embodiment, the equipment body 510 is frame-shaped and has a first compression station 511, a maintenance station 512, and a second compression station 513 arranged sequentially. The equipment body 510 is provided with a track 514. The pressure head assembly 300 is movably mounted on the track 514 and can move along the track 514 between the first compression station 511, the maintenance station 512, and the second compression station 513.

[0032] It should also be noted that in some cases, the equipment body 510 may have only one waste compression station and one maintenance station, or multiple waste compression stations, such as four, five or more.

[0033] Please refer to Figure 3 In this embodiment, the hydraulic control system 100 includes a compression cylinder 110, an oil tank 120, an oil pump 130, and a control valve assembly 140. The compression cylinder 110 is used to drive the pressure head to move in a first direction. The compression cylinder 110 has a rod chamber 111 and a rodless chamber 112. The first direction is at an angle to the horizontal direction. The control valve assembly 140 is connected to the oil pump 130, the oil tank 120, the rod chamber 111, and the rodless chamber 112. In the first state, the control valve assembly 140 can cut off the oil pump output and allow hydraulic oil to flow out of the rod chamber 111 while simultaneously allowing hydraulic oil to flow to the rodless chamber, so that the compression cylinder extends under the load.

[0034] In this process, the hydraulic oil in the rod chamber 111 flows out while the hydraulic oil flows to the rodless chamber. This can be achieved by first allowing the hydraulic oil in the rod chamber 111 to flow back to the oil tank 120 through the return oil channel between the rod chamber 111 and the oil tank 120, and then allowing the hydraulic oil in the oil tank 120 to replenish the oil in the rodless chamber 112 due to the extension of the compression cylinder 110. The hydraulic oil flows out of the rod chamber 111 and into the rodless chamber at the same time. It can also form a direct return oil channel between the rod chamber 111 and the rodless chamber 112, so that the hydraulic oil flows directly from the rod chamber 111 into the rodless chamber 112. The oil tank 120 replenishes the rodless chamber 112 with the oil difference between the rod chamber 111 and the rodless chamber 112 to avoid cavitation and air mixing into the hydraulic oil.

[0035] In this embodiment, a control valve assembly 140 is provided and connected to the oil pump 130, the oil tank 120, and the rod chamber 111 and rodless chamber 112 of the compression cylinder 110. In the first state, the control valve assembly can cut off the oil pump output and allow hydraulic oil to flow from the rod chamber to the rodless chamber simultaneously, thus extending the compression cylinder under load. During this stage, the extension of the compression cylinder 110 can be achieved without the oil pump 130 operating to supply oil, thereby achieving better energy savings.

[0036] Furthermore, the control valve assembly 140 also has a second state. In this second state, the oil pump 130 is connected to the rodless chamber 112 while the rod chamber 111 is connected to the oil tank 120. This allows the oil pump 130 to supply hydraulic oil to the rodless chamber 112, causing the compression cylinder 110 to extend. The extension of the compression cylinder 110, driven by the hydraulic oil supplied by the oil pump 130, drives the pressure head 320 to compress waste.

[0037] The control valve assembly 140 also has a third state in which the control valve assembly 140 connects the oil pump 130 and the rod chamber 111, and connects the rodless chamber 112 to the oil tank 120, so that the compression cylinder 110 shortens the lifting head 320 under the push of the hydraulic oil supplied by the oil pump 130.

[0038] Overall, the hydraulic control system 100 enables the garbage compression process to be divided into "discharging garbage - the compression cylinder 110 extends without power by a predetermined distance under the load of the pressure head 320 - the compression cylinder 110 extends and compresses the garbage under the power of the oil pump 130 - the compression cylinder 110 shortens and the pressure head 320 is raised under the power of the oil pump 130 - discharging garbage again". Compared with the existing technology, this adds the process of the compression cylinder 110 extending without power under the load of the pressure head 320 to make the pressure head 320 contact the garbage, thereby reducing energy consumption and improving garbage compression efficiency.

[0039] It should be noted that in a vertical waste compression station, the first direction is the vertical direction. Of course, in some other waste compression stations, the first direction can also be the direction that is inclined relative to the horizontal direction.

[0040] Please refer to Figure 3 In this embodiment, the hydraulic control system 100 further includes a first oil circuit 150 and a second oil circuit 160. The rodless chamber 112 is connected to the control valve assembly 140 through the first oil circuit 150, and the rod chamber 111 is connected to the control valve assembly 140 through the second oil circuit 160. The first oil circuit 150 and the second oil circuit 160 can supply or return oil in different states of the control valve assembly 140.

[0041] The weight of a typical pressure head 320 is 2-3 tons, and some are even heavier. In the first state, the control valve assembly 140 cuts off the oil pump output and allows the hydraulic oil in the rod chamber 111 to flow out through the second oil passage while simultaneously allowing the hydraulic oil to flow through the first oil passage to the rodless chamber. Thus, under the gravity of the pressure head 320, the oil in the rod chamber 111 of the compression cylinder 110 returns to the oil tank 120, and the compression cylinder 110 extends. This extension creates a negative pressure in the rodless chamber 112, causing it to draw oil from the oil tank 120 and fill the rodless chamber 112. Therefore, the extension of the compression cylinder 110 under the gravity of the pressure head 320 does not require power from the oil pump 130. The control valve assembly 140 connects the rod chamber 111 and the rodless chamber 112, so that the oil in the rod chamber 111 can return to the rodless chamber 112 under the gravity of the pressure head 320, realizing the flow of hydraulic oil. It also enables the compression cylinder 110 to extend under the gravity of the pressure head 320 without the need for the oil pump 130 to provide power.

[0042] Furthermore, the control valve assembly 140 includes a directional valve 141, which is connected to the oil pump 130 and the oil tank 120. The rodless chamber 112 is connected to the directional valve 141 through the first oil passage 150, and the rod chamber 111 is connected to the directional valve 141 through the second oil passage 160.

[0043] When the reversing valve 141 is in the first working position, it enables both the first oil passage 150 and the second oil passage 160 to be connected to the oil tank 120, and stops the oil pump 130 from supplying hydraulic oil to the compression cylinder 110, so that the compression cylinder 110 extends under the load of the pressure head 320.

[0044] When the reversing valve 141 is in the second working position, it can connect the oil pump 130 and the first oil circuit 150 while connecting the second oil circuit 160 and the oil tank 120, so that the oil pump 130 can supply hydraulic oil to the rodless chamber 112, causing the compression cylinder 110 to extend.

[0045] When the directional valve 141 is in the third working position, it can connect the oil pump 130 and the second oil circuit 160 while connecting the first oil circuit 150 and the oil tank 120, so that the oil pump 130 can supply hydraulic oil to the rod chamber 111, thereby shortening the compression cylinder 110.

[0046] This embodiment, through the above connection method, can realize the process of the compression cylinder 110 extending a preset distance without power under the load of the pressure head 320, the process of the compression cylinder 110 extending to compress garbage under the power of the oil pump 130, and the process of the compression cylinder 110 shortening the pressure head 320 and lifting under the power of the oil pump 130, and the structure is relatively simple.

[0047] In this embodiment, the directional valve 141 is a three-position four-way Y-type electro-hydraulic directional valve 141, having a P port 142, a T port 143, an A port 144, and a B port 145. The P port 142 is the oil inlet, where hydraulic oil enters the directional valve 141, and is connected to the oil outlet of the oil pump 130, supplying hydraulic oil to the system. The T port 143 is the oil return port, generally connected to the oil tank 120 via a return pipe, returning the oil after passing through the directional valve 141 to the oil tank 120, thus achieving oil circulation. The A port 144 and the B port 145 are two working ports, respectively connected to the rod chamber 111 and the rodless chamber 112 of the compression cylinder 110, used to control the flow of hydraulic oil to different chambers of the compression cylinder 110, thereby driving the piston movement of the compression cylinder 110 and realizing the reciprocating motion of the pressure head 320, etc.

[0048] Please refer to Figure 3 In this embodiment, port A 144 is connected to the rodless chamber 112 of the compression cylinder 110 through the first oil passage 150, while port B 145 is connected to the rod chamber 111 of the compression cylinder 110 through the second oil passage 160.

[0049] It should be noted that the valve core of the electro-hydraulic directional valve 141 has three working positions, allowing for three connection methods for port P 142, port T 143, port A 144, and port B 145. In the first working position: port A 144 and port B 145 are both connected to port T 143, and port P 142 is closed. At this time, the first oil passage 150 and the second oil passage 160 are both connected to the oil tank 120. The oil in the rod chamber 111 flows along the second oil passage 160 to port B 145 and then to port T 143. Due to the negative pressure in the rod chamber 111, port T 143 supplies oil to port A 144, and then flows through the first oil passage 150 to the rodless chamber 112. Thus, the compression cylinder 110 descends without power under the action of gravity of the pressure head 320. At the second station: when port P142 is connected to port A144 and port B145 is connected to port T143, the hydraulic oil supplied by the oil pump 130 enters from port P142, flows through port A144 and the first oil passage 150 to the rodless chamber 112 of the hydraulic cylinder, pushing the piston of the compression cylinder 110 to move. The oil in the rod chamber 111 flows back to the oil tank 120 through the second oil passage 160, port B145 and port T143, thereby realizing the powered compression of garbage.

[0050] At the third station: when port P142 is connected to port B145 and port A144 is connected to port T143, the hydraulic oil supplied by the oil pump 130 enters from port P142, flows through port B145 and the second oil passage 160 to the rod chamber 111 of the hydraulic cylinder, pushing the piston of the compression cylinder 110 to move. The oil in the rodless chamber 112 flows back to the oil tank 120 through the first oil passage 150, port A144 and port T143, thereby lifting the pressure head 320.

[0051] Please refer to Figure 3In this embodiment, the control valve assembly 140 further includes a balance valve 190, which is disposed in the second oil passage 160. The balance valve 190 can maintain the load when the directional valve 141 is in the first working position. When the directional valve 141 actively descends in the second working position, the oil pump 130 supplies hydraulic oil through the first oil passage 150 to enter the rodless chamber 112, pushing the pressure head 320 down. At this time, the pressure in the rod chamber 111 gradually increases. When the pressure reaches the opening pressure value of the balance valve 190, the hydraulic oil in the rod chamber 111 can flow back to the oil tank 120 through the balance valve 190.

[0052] Furthermore, the control valve assembly 140 also includes a second directional valve 170 and a third oil passage 180, with the two ends of the third oil passage 180 connected to the rod chamber 111 and the rodless chamber 112, respectively. The second directional valve 170 is disposed in the third oil passage 180. The second directional valve 170 has an open working position and a closed working position. When the control valve assembly 140 is in the first state, the second directional valve 170 is in the open working position, and the directional valve 141 is in the first working position, so that the rod chamber 111 and the rodless chamber 112 are connected through the third oil passage 180. When the directional valve 141 is in the second or third working position, the second directional valve 170 is in the closed working position to block the third oil passage 180; that is, when the control valve assembly 140 is in the second or third state, the second directional valve 170 is in the closed working position to block the third oil passage 180.

[0053] In this embodiment, a second directional valve 170 is provided in the third oil passage 180, which is connected to both the rod chamber 111 and the rodless chamber 112. This allows the second directional valve 170 to switch to the open position during the extension of the compression cylinder 110 under the gravity of the pressure head 320. This solves the technical problem that when the second oil passage 160 is equipped with a balance valve or other obstructing components that block the flow of oil from the rod chamber 111 through the second oil passage 160, the oil in the rod chamber 111 cannot be smoothly discharged through the second oil passage 160. It also allows the hydraulic oil discharged from the rod chamber 111 to flow into the third oil passage 180 and quickly replenish the rodless chamber 112.

[0054] In the preferred solution, please refer to Figure 3 The first end of the third oil passage 180 is connected to the first oil passage 150, and the second end of the third oil passage 180 is connected to the portion of the second oil passage 160 located between the balance valve 190 and the rod chamber 111. This shortens the length of the third oil passage 180.

[0055] In this embodiment, the second directional valve 170 is a two-position electro-hydraulic directional valve 141. It has an inlet and an outlet. When energized (i.e., in the open working position), the inlet and outlet are connected, and when de-energized (i.e., in the closed working position), the inlet and outlet are disconnected.

[0056] Please refer to Figure 3 In this embodiment, the hydraulic control system 100 further includes a one-way valve assembly 240 and a fifth oil passage 250. One end of the fifth oil passage 250 is connected to the oil tank 120, and the other end is connected to the rodless chamber 112. The one-way valve assembly 240 is disposed in the fifth oil passage 250, and the one-way valve assembly 240 can connect the rodless chamber 112 with the oil tank 120 when the compression cylinder 110 extends.

[0057] In this embodiment, by setting a fifth oil passage 250 and a one-way valve group 240, when the compression cylinder 110 extends under the action of gravity, oil can be directly replenished from the oil tank 120 to the rodless chamber 112 through the fifth oil passage 250. Compared with the flow method through the first oil passage 150, port A 144 and port T 143, the oil replenishment resistance is smaller and the oil replenishment efficiency is higher, thereby improving efficiency.

[0058] In this embodiment, the one-way valve group 240 is a hydraulically controlled one-way valve, and the control port of the hydraulically controlled one-way valve is connected to the second oil circuit 160 through the sixth oil circuit 280.

[0059] When the compression cylinder 110 retracts (moves upwards), the hydraulic control system 100 needs to overcome load forces such as gravity. This results in a certain pressure within the hydraulic control system 100, especially in the second oil circuit 160. This pressure value can open the pilot-operated check valve, allowing reverse flow. When the compression cylinder 110 retracts, a portion of the hydraulic oil in the rodless chamber 112 can flow back to the hydraulic oil tank 120 through the pilot-operated check valve. This increases the return oil flow capacity and reduces the return oil back pressure, thereby reducing pipeline friction resistance and local pressure loss, and improving system stability and efficiency.

[0060] In this embodiment, the oil tank 120 is located above the compression cylinder 110. That is, the oil tank 120 is fixed to the top of the mounting platform 310, while the compression cylinder 110 is fixed to the bottom of the mounting platform 310. This improves the oil replenishment efficiency under the gravity of the hydraulic oil.

[0061] In this embodiment, the control valve assembly 140 further includes a fourth oil passage 210, one end of which is connected to the pilot oil port 191 of the balance valve 190, and the other end is connected to the first oil passage 150.

[0062] In this embodiment, the pilot port 191 of the balance valve 190 is connected to the first oil circuit 150 through the fourth oil circuit 210. This allows the control valve core of the balance valve 190 to be supplied with a certain pressure through the fourth oil circuit 210 when the reversing valve 141 switches to the second working position, so that the control valve core of the balance valve 190 tends to open. This facilitates the return oil from the rod chamber 111 to stably open the control valve core of the balance valve 190, reducing the reversing shock of the control valve core of the balance valve 190.

[0063] In this embodiment, the fourth oil circuit 210 is equipped with a first throttle valve 220. This provides a larger pressure drop, preventing the control valve core of the hydraulic oil drop balance valve 190 in the fourth oil circuit 210 from being pushed open. The first throttle valve 220 also reduces the vibration of the balance valve 190. When the control oil pressure of the balance valve 190 drops, the hydraulic oil in the control chamber must pass through the throttling gap of the first throttle valve 220 before flowing out, thereby reducing the vibration of the control piston and improving the service life of the control valve.

[0064] Please refer to Figure 3 In this embodiment, the third oil passage 180 is provided with a second throttle valve 230. Specifically, the third oil passage 180, located between the second directional valve 170 and the first oil passage 150, is provided with a second throttle valve 230.

[0065] In this embodiment, by setting a second throttle valve 230, the extension speed of the compression cylinder 110 during the unpowered extension process can be adjusted by adjusting the opening of the throttle orifice, thereby adjusting the stability of the pressure head 320's self-weight descent operation.

[0066] It should be noted that both the first throttle valve 220 and the second throttle valve 230 are valves that control fluid flow by changing the throttle cross section or throttle length.

[0067] Please refer to Figure 4 In this embodiment, the hydraulic control system 100 further includes a sensor 260 and a controller 270. The sensor 260, the oil pump 130, and the control valve group 140 (including the reversing valve 141 and the second reversing valve 170 in the control valve group 140) are all connected to the controller 270. The controller 270 can control the operation of the oil pump 130 and the control valve group 140 according to the input control commands and the information detected by the sensor 260. The sensor 260 can be a laser rangefinder, a pull-wire sensor, a proximity switch, or other distance position detection device installed on the pressure head 320. The controller 270 can switch the control valve group 140 according to the signal fed back by the sensor 260.

[0068] In one embodiment, sensor 260 is a laser rangefinder sensor, which is installed on one side of the pressure head 320 to detect the distance between the top plane of the waste to be compressed and the pressure head 320, so that the controller 270 can perform automatic control according to the following working process, or it can perform corresponding control according to the input of manual control commands.

[0069] Of course, when sensor 260 is a proximity switch, the proximity switch can be set at the position corresponding to the opening of the garbage bin in the vertical station.

[0070] The controller 270 includes a processor, a memory, and a bus. The processor is connected to the memory via the bus. The memory stores programs, and the processor executes these programs upon receiving execution instructions to implement the hydraulic control system control method disclosed in the following embodiments. The memory may include high-speed random access memory (RAM) or non-volatile memory (NVM). The processor may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the following methods can be completed by integrated logic circuits in the processor or by instructions in software form. The processor can be a general-purpose processor, including a central processing unit (CPU), a microcontroller unit (MCU), a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), an embedded ARM chip, etc. Please refer to Figure 5 The working process of a waste compression station is as follows: S1. Upon receiving the extension command from the compression cylinder 110, control the control valve group 140 to switch to the first state; That is, upon receiving the extension command of the compression cylinder 110, the control valve group 140 is activated to extend the compression cylinder 110 under the load of the pressure head 320. During this process, the oil pump 130 is stopped.

[0071] In the first state, the control valve group 140 can cut off the output of the oil pump and allow the hydraulic oil to flow out of the rod chamber 111 while simultaneously allowing the hydraulic oil to flow to the rodless chamber, so that the compression cylinder can extend under the load.

[0072] It should be noted that the extension command of the compression cylinder 110 can be sent manually via a remote control device or determined by a set sensor. In one embodiment, the extension command of the compression cylinder 110 is determined based on the actual distance between the pressure head 320 and the highest point of the dumped waste, as measured by a laser rangefinder. Since the actual distance between the pressure head 320 and the highest point of the dumped waste decreases as more waste is dumped, the extension command of the compression cylinder 110 can be confirmed when the actual distance reaches a preset threshold.

[0073] S2. Determine whether the compression cylinder 110 has extended to the first preset position; The first preset position is higher than or equal to the material level height of the trash can. Specifically, it can be a fixed position set by the user or a dynamic position determined according to the real-time material level height of the trash can.

[0074] In a preferred embodiment of the present invention, the first preset position is located at the inlet of the garbage bin.

[0075] In another embodiment of this utility model, the first preset position can be determined based on the real-time material level height of the garbage in the garbage bin by the material level data collected by the material level sensor in the garbage bin, or by the image data collected by the visual sensor at the garbage bin inlet and the material level height in the garbage bin determined by the visual detection algorithm, and the first preset position can be determined based on the real-time material level.

[0076] It should be noted that determining whether the compression cylinder 110 has extended to the first preset position is based on the actual vertical distance between the pressure head 320 and the highest point of the dumped garbage, measured by the laser rangefinder, and a preset distance. The preset distance is manually set. When the actual distance is less than or equal to the preset distance, it is confirmed that the compression cylinder 110 has extended to the preset position. When the actual distance is greater than the preset distance, it is confirmed that the compression cylinder 110 has not extended to the preset position. The first preset position can be set as needed; it can be the highest point of the garbage or the inlet of the garbage bin.

[0077] By determining whether the compression cylinder 110 has extended to the preset position, the automatic control of steps S1 to S3 can be better achieved.

[0078] S3. If the compression cylinder 110 extends to the first preset position, control the oil pump 130 to run and control the control valve group 140 to switch to the second state. That is, the hydraulic control system 100 uses the oil pump 130 to supply oil to extend the compression cylinder 110 to compress the waste, and can achieve rapid switching. In the second state, when the control valve group 140 is in the second state, the oil pump 130 is connected to the rodless chamber while the rod chamber is connected to the oil tank, so that the oil pump supplies hydraulic oil to the rodless chamber, causing the compression cylinder to extend.

[0079] Furthermore, in step S1, the step of controlling the control valve group 140 to switch to the first state includes: S11. While confirming that the reversing valve 141 is in the first working position, control the second reversing valve 170 to switch to the open working position. In this embodiment, by controlling the second directional valve 170 to switch to the open working position, the return oil from the rodless chamber 112 can flow back into the rodless chamber 112 through the second directional valve 170, and oil can be quickly supplied to the rodless chamber 112. Most importantly, it can increase the oil supply pressure of the first oil circuit 150, thereby improving the compression efficiency. In some embodiments, the first working position is a load holding working position. After the compression cylinder is raised to the second preset position, the directional valve will be switched to the first working position to maintain the load. The step of controlling the control valve group 140 to switch to the first state only requires switching the second directional valve 170 to the open working position. Switching the directional valve 141 to the first working position will be done after the compression cylinder is shortened to the position.

[0080] In step S3, the step of switching the control valve group 140 to the second state includes: S31, while controlling the reversing valve 141 to switch to the second working position, simultaneously control the second reversing valve 170 to switch to the closed working position.

[0081] The above method can control the reversing valve 141 to switch between the first working position, the second working position and the third working position according to different control commands, so as to realize the extension of the compression cylinder 110 under the action of gravity of the pressure head 320, the extension of the compression cylinder 110 to compress the garbage under the action of power of the oil pump 130, and the shortening of the compression cylinder 110 to lift the pressure head 320.

[0082] Please refer to Figure 6 The working process of a waste compression station is as follows: S4. After receiving the shortening command from the compression cylinder 110, control the reversing valve 141 to switch to the third working position, and simultaneously control the second reversing valve 170 to switch to the closed working position.

[0083] It should be noted that the shortening command for the compression cylinder 110 can be sent by the operator via a remote control device, or it can be determined by a sensor installed in the hydraulic control system 100. For example, it can be determined by an oil pressure sensor installed in the first oil circuit 150. Specifically, it can be determined based on the actual pressure measured by the oil pressure sensor and the preset pressure. When the actual pressure is greater than the preset pressure, it is determined as a shortening command for the compression cylinder 110.

[0084] S5. Determine whether the compression cylinder 110 has retracted back to the second preset position; It should be noted that the second preset position represents the position of the compression cylinder 110 when the pressure head 320 is raised to its highest position. The second preset position can be determined by sensors such as proximity switches installed on the frame.

[0085] S6. If the compression cylinder 110 retracts to the second preset position, after a preset delay, control the reversing valve 141 to switch to the first working position.

[0086] It should be noted that the preset time can be set according to actual needs, such as 1 second, 3 seconds, 5 seconds, etc.

[0087] During the shortening process of the compression cylinder 110, there may be a problem with the oil discharge from the first oil circuit 150 being obstructed, leading to an increase in pressure in the first oil circuit 150. This, in turn, causes an increase in pressure in the fourth oil circuit 210, opening the main valve core of the balance valve 190 and inhibiting the oil supply from the first oil circuit 150. The delay control provides sufficient time for the main valve core of the balance valve 190 to reset after the compression cylinder 110 has retracted to its final position. This prevents the compression cylinder 110 from falling under the gravity of the pressure head 320 after retracting due to the main valve core of the balance valve 190 not resetting in time. This also prevents the sensor 260 from failing to detect the position of the pressure head 320 after it has moved to other compression positions.

[0088] Overall, the hydraulic control system divides the garbage compression process into "garbage dumping - compression cylinder 110 extends without power under the load of pressure head 320 to contact the garbage - compression cylinder 110 extends and compresses the garbage under the power of oil pump 130 - compression cylinder 110 shortens and pressure head 320 is raised under the power of oil pump 130 - garbage dumping again". Compared with the existing technology, this adds the process of compression cylinder 110 extending without power under the load of pressure head 320 to contact the garbage, which can reduce energy consumption and improve garbage compression efficiency. It can also realize automatic operation between steps S1 and S3, thereby reducing the difficulty of operation.

[0089] In summary, this embodiment, by setting up a control valve assembly 140 and connecting it to the oil pump 130, the oil tank 120, and the rod-side chamber 111 and rodless chamber 112 of the compression cylinder 110, allows the control valve assembly 140 to cut off the output of the oil pump 130 in the first state. Simultaneously, it allows hydraulic oil to flow from the rod-side chamber 111 to the rodless chamber 112, enabling the compression cylinder 110 to extend under load. During this stage, the extension of the compression cylinder 110 can be achieved without the oil pump 130 operating, thus achieving better energy savings. Furthermore, it allows for rapid extension of the compression cylinder 110.

[0090] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A hydraulic control system, characterized in that, include: A compression cylinder (110) is used to drive the load to move in a first direction. The compression cylinder (110) has a rod chamber (111) and a rodless chamber (112). The first direction is at an angle to the horizontal direction. Fuel tank (120); Oil pump (130); A control valve assembly (140) is connected to the oil pump (130), the oil tank (120), the rod chamber (111), and the rodless chamber (112). In the first state, the control valve assembly (140) can cut off the output of the oil pump (130) and allow the hydraulic oil to flow out of the rod chamber (111) and flow to the rodless chamber (112) at the same time, so that the compression cylinder (110) can extend under the load.

2. The hydraulic control system according to claim 1, characterized in that, The hydraulic control system further includes a first oil circuit (150) and a second oil circuit (160); the control valve group (140) includes a directional valve (141), the directional valve (141) is connected to the oil pump (130) and the oil tank (120), and the rodless chamber (112) is connected to the directional valve (141) through the first oil circuit (150), and the rod chamber (111) is connected to the directional valve (141) through the second oil circuit (160); When the reversing valve (141) is in the first working position, it enables the first oil passage (150) and the second oil passage (160) to be connected to the oil tank (120), and stops the oil pump (130) from supplying hydraulic oil to the compression cylinder (110), so that the compression cylinder (110) extends under the action of the load gravity. When the reversing valve (141) is in the second working position, it can connect the oil pump (130) and the first oil circuit (150) while connecting the second oil circuit (160) and the oil tank (120), so that the oil pump (130) can supply hydraulic oil to the rodless chamber (112) and extend the compression cylinder (110). When the reversing valve (141) is in the third working position, it can connect the oil pump (130) and the second oil circuit (160) while connecting the first oil circuit (150) and the oil tank (120), so that the oil pump (130) can supply hydraulic oil to the rod chamber (111) and shorten the compression cylinder (110).

3. The hydraulic control system according to claim 2, characterized in that, The control valve assembly (140) further includes a balance valve (190), which is located in the second oil passage (160). The pilot port (191) of the balance valve (190) is connected to the first oil passage (150) through the fourth oil passage (210). The balancing valve (190) is used to maintain the load when the directional valve (141) is in the first operating position.

4. The hydraulic control system according to claim 3, characterized in that, The control valve assembly (140) further includes a second directional valve (170) and a third oil passage (180); the two ends of the third oil passage (180) are respectively connected to the rod chamber (111) and the rodless chamber (112); the second directional valve (170) is disposed in the third oil passage (180). The second directional valve (170) has an open position and a closed position; When the control valve group (140) is in the first state, the second directional valve (170) is in the open working position, and the directional valve (141) is in the first working position, so that the rod chamber (111) and the rodless chamber (112) are connected through the third oil passage (180); The second directional valve (170) is in the closed position when the directional valve (141) is in the second or third working position, so as to block the third oil passage (180).

5. The hydraulic control system according to claim 4, characterized in that, The first end of the third oil passage (180) is connected to the first oil passage (150); the second end of the third oil passage (180) is connected to the portion of the second oil passage (160) located between the balance valve (190) and the rod chamber (111).

6. The hydraulic control system according to any one of claims 2-5, characterized in that, The hydraulic control system also includes a check valve assembly (240) and a fifth oil circuit (250). One end of the fifth oil passage (250) is connected to the oil tank (120), and the other end is connected to the rodless cavity (112). The one-way valve assembly (240) is located in the fifth oil circuit (250), and the one-way valve assembly (240) can connect the rodless chamber (112) with the oil tank (120) when the compression cylinder (110) extends.

7. The hydraulic control system according to claim 6, characterized in that, The one-way valve assembly (240) is a hydraulically controlled one-way valve, and the control port of the hydraulically controlled one-way valve is connected to the second oil circuit (160) through the sixth oil circuit (280).

8. The hydraulic control system according to any one of claims 3-5, characterized in that, The fourth oil circuit (210) is equipped with a first throttle valve (220).

9. The hydraulic control system according to claim 4 or 5, characterized in that, The third oil passage (180) is equipped with a second throttle valve (230).

10. A waste compression device, characterized in that, It includes the equipment body (510), the mounting platform (310), the pressure head (320), and the hydraulic control system according to any one of claims 1-9; One end of the compression cylinder (110) is connected to the mounting platform (310), the pressure head (320) is installed at the other end of the compression cylinder (110), and the oil tank (120) is installed on the mounting platform (310). The installation platform (310) is located on the device body (510).

11. The waste compression device according to claim 10, characterized in that, The oil tank (120) is located above the compression cylinder (110).

12. The waste compression device according to claim 10, characterized in that, The waste compression device also includes a sensor (260) and a controller (270). The sensor (260), the oil pump (130) and the control valve group (140) are all connected to the controller (270), and the sensor is used to detect the extension position of the compression cylinder; The controller (270) is able to control the control valve group (140) to switch to the first state after receiving the extension command of the compression cylinder (110); The controller (270) can also determine whether the compression cylinder (110) has extended to the first preset position based on the extension position of the compression cylinder detected by the sensor. The controller (270) can also control the oil pump (130) to run after the compression cylinder (110) extends to the first preset position, and control the control valve group (140) to operate so that the oil pump (130) is connected to the rodless chamber (112) and the rod chamber (111) is connected to the oil tank (120) so that the oil pump (130) supplies hydraulic oil to the rodless chamber (112) so that the compression cylinder (110) extends.

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