Hydraulic system of garbage compression station, control method and garbage compression station

Abstract

The invention provides a garbage compression station hydraulic system, a control method and a garbage compression station, and relates to the technical field of garbage compression. The garbage compression station hydraulic system comprises an oil tank, an oil pump, a scraper oil cylinder, a first reversing valve and a second reversing valve. The oil pump is connected with the oil tank. And the scraper oil cylinder is used for driving a scraper of the garbage compression station to act. The first reversing valve is connected to the oil tank, the oil pump and a rodless cavity of the scraper oil cylinder. And the second reversing valve is connected to the oil tank and the rodless cavity and the rod cavity of the scraper oil cylinder. When the scraper compresses garbage, the first reversing valve enables the oil pump to be communicated with a rodless cavity of the scraper oil cylinder, and meanwhile the second reversing valve enables the rodless cavity of the scraper oil cylinder to be communicated with a rod cavity of the scraper oil cylinder. Through the arrangement of the hydraulic system, the compression efficiency of the scraper can be improved.

Description

Technical Field

[0001] This invention relates to the field of waste compression technology, and more specifically, to a hydraulic system, control method, and waste compression station for a waste compression station. Background Technology

[0002] A waste compression station is a facility used for the centralized compression and transfer of waste. A scraper-type waste compression station compresses waste through the combined action of scrapers and sliding plates.

[0003] In existing technologies, the scraper cylinders of the hydraulic system in a scraper-type waste compactor station are typically connected to the supply and return oil circuits of the hydraulic system via a three-position four-way directional valve. During the waste compaction cycle, the three-position four-way directional valve switches the supply oil circuit and the rodless chamber of the scraper cylinder, while simultaneously connecting the rod chamber of the scraper cylinder to the return oil circuit, thereby driving the scraper rod to extend and compress the waste. During scraper retraction, the three-position four-way directional valve switches again, connecting the supply oil circuit and the rod chamber of the scraper cylinder, while simultaneously connecting the rodless chamber of the scraper cylinder to the return oil circuit, thereby driving the scraper cylinder to retract and reset. However, during the scraper compaction process, the scraper is subjected to a reverse force generated by the waste. This reverse force partially offsets the power driving the scraper compaction, leading to a decrease in compaction efficiency and consequently prolonging the overall compaction operation time.

[0004] Therefore, how to improve the compression efficiency of scrapers has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The present invention aims to provide a hydraulic system, control method and waste compression station for a waste compression station, which can improve the compression efficiency of the scraper and thus reduce the duration of compression.

[0006] The embodiments of the present invention can be implemented as follows: In a first aspect, this application provides a hydraulic system for a waste compression station, comprising: tank; An oil pump is connected to the oil tank; Scraper cylinders are used to drive the scraper action in a waste compression station. The first directional valve is connected to the oil tank, the oil pump, and the rodless chamber of the scraper cylinder; The second directional valve is connected to the first directional valve, the rodless chamber and the rod chamber of the scraper cylinder; When the scraper compresses the waste, the first reversing valve connects the oil pump to the rodless chamber of the scraper cylinder, while the second reversing valve connects the rodless chamber and the rod chamber of the scraper cylinder.

[0007] In an optional embodiment, the first directional valve has a first oil supply port, a first oil return port, a first working oil port, and a second working oil port, and the second directional valve has a first connection port, a second connection port, and a third connection port. The first oil supply port is connected to the oil pump, the first oil return port is connected to the oil tank, the first working oil port is connected to the rodless chamber of the scraper cylinder through a first flow channel, the second working oil port is connected to the first connection port through a second flow channel, the second connection port is connected to the rodless chamber of the scraper cylinder, and the third connection port is connected to the rod chamber of the scraper cylinder. The first reversing valve has a first working state in which the first oil supply port is connected to the first working port and the first oil return port is connected to the second working port at the same time. The second reversing valve has a third operating state in which the second connection port and the third connection port are connected; When the scraper cylinder drives the scraper to perform differential garbage compression, the first reversing valve is in the first working state, and the second reversing valve is in the third working state.

[0008] In an optional embodiment, the second reversing valve further has a fourth operating state in which the second connection port is closed while the first connection port and the third connection port are connected. When the scraper cylinder drives the scraper to compress waste, the first reversing valve is in the first working state, and the second reversing valve is in the fourth working state.

[0009] In an optional embodiment, the first reversing valve further has a second working state in which the first oil supply port is connected to the second working port while the first oil return port is connected to the first working port. The second reversing valve also has a fourth working state in which the second connection port is closed while the first connection port and the third connection port are connected; when the scraper cylinder drives the scraper to reset, the first reversing valve is in the second working state and the second reversing valve is in the fourth working state.

[0010] In an optional embodiment, the first flow channel is connected to a first overflow oil passage communicating with the oil tank. The first overflow oil passage is provided with a first overflow valve. When the pressure of the first flow channel is greater than the preset pressure of the first overflow valve, the first overflow valve can open to overflow into the oil tank. And / or, the second flow channel is connected to a first one-way flow channel communicating with the oil tank, the first one-way flow channel is provided with a first one-way valve, the first one-way valve can make the first one-way flow channel open in the direction of the second flow channel.

[0011] In an optional embodiment, the first directional valve is an O-type three-position four-way directional valve, and the first directional valve also has a neutral position where the first oil supply port, the first oil return port, the first working oil port and the second working oil port are all closed; the second directional valve also has a fourth working state where the second connection port is closed while the first connection port and the third connection port are connected. When the scraper is holding pressure, the first reversing valve is in the neutral position and the second reversing valve is in the fourth working state.

[0012] In an optional embodiment, the first flow channel is connected to a first overflow oil passage communicating with the oil tank. The first overflow oil passage is provided with a first overflow valve. When the pressure of the first flow channel is greater than the preset pressure of the first overflow valve, the first overflow valve can open to overflow into the oil tank. The oil pump is connected to the first oil supply port through a fourth flow channel; the fourth flow channel is connected to a second overflow branch that returns to the oil tank, and the second overflow branch is equipped with a second overflow valve. When the pressure in the fourth flow channel is greater than the preset pressure of the second overflow valve, the second overflow valve can open to overflow into the oil tank. The preset pressure of the first relief valve is greater than the preset pressure of the second relief valve.

[0013] Secondly, this application provides a waste compression station, including a frame, a slide plate disposed on the frame, a scraper disposed on the slide plate, and a hydraulic system for the waste compression station as described above. The scraper cylinder is connected to the slide plate and the scraper respectively. The extension of the scraper cylinder can drive the scraper to rotate relative to the slide plate to compress waste, and the extension of the scraper cylinder can drive the scraper to reset.

[0014] Thirdly, this application provides a waste compression station control method for controlling the aforementioned waste compression station; In the compression loop, the method includes: Determine if the skateboard has moved to the preset position; After the slide plate moves to the preset position, the first reversing valve is controlled to connect the oil pump with the rodless chamber of the scraper cylinder, and the second reversing valve is controlled to connect the rodless chamber and the rod chamber of the scraper cylinder.

[0015] In an optional embodiment, the first directional valve has a first oil supply port, a first oil return port, a first working oil port, and a second working oil port, and the second directional valve has a first connection port, a second connection port, and a third connection port. The first oil supply port is connected to the oil pump, the first oil return port is connected to the oil tank, the first working oil port is connected to the rodless chamber of the scraper cylinder through a first flow channel, the second working oil port is connected to the first connection port through a second flow channel, the second connection port is connected to the rodless chamber of the scraper cylinder, and the third connection port is connected to the rod chamber of the scraper cylinder. The first reversing valve has a first working state in which the first oil supply port is connected to the first working port and the first oil return port is connected to the second working port at the same time. The second reversing valve has a third operating state in which the second connection port and the third connection port are connected; The step of controlling the first reversing valve to connect the oil pump with the rodless chamber of the scraper cylinder, and simultaneously controlling the second reversing valve to connect the rodless chamber and the rod chamber of the scraper cylinder, includes: Control the first reversing valve to switch to the first working state, and control the second reversing valve to switch to the third working state.

[0016] In an optional embodiment, the second reversing valve further has a fourth operating state in which the second connection port is closed while the first connection port and the third connection port are connected. The description also includes: Obtain the actual pressure in the rodless chamber of the scraper cylinder; Determine whether the actual pressure is greater than or equal to a first preset threshold; When the actual pressure is greater than the first preset threshold, the second reversing valve is controlled to switch to the fourth working state.

[0017] In an optional implementation, the method further includes: Determine whether the actual pressure is greater than or equal to a second preset threshold; wherein the second preset threshold is greater than the first preset threshold; When the actual pressure is greater than or equal to the second preset threshold, the speed of the oil pump is controlled to be reduced to the first preset speed and then maintained.

[0018] In an optional embodiment, the first reversing valve further has a neutral position where the first oil supply port, the first oil return port, the first working oil port, and the second working oil port are all closed. The first reversing valve also has a second working state in which the first oil supply port is connected to the second working port and the first oil return port is connected to the first working port at the same time. The method further includes: Determine whether the actual pressure is greater than or equal to a third preset threshold; wherein the third preset threshold is greater than the second preset threshold; When the actual pressure is greater than or equal to the third preset threshold, the first reversing valve is controlled to switch to the neutral position. Determine whether the slide has moved to the compression cutoff position; After the slide plate moves to the compression cutoff position, the first reversing valve is controlled to switch to the second working state, and the speed of the oil pump is increased to the second preset speed; wherein, the second preset speed is greater than the first preset speed; Determine whether the scraper has flipped up to the correct position; After the scraper is flipped into position, the first reversing valve is controlled to switch to the neutral position.

[0019] The beneficial effects of the hydraulic system, control method, and waste compression station provided in this invention include: This application incorporates a first directional valve connected to the oil tank, oil pump, and rodless chamber of the scraper cylinder, and a second directional valve connected to the first directional valve and both the rodless and rod chambers of the scraper cylinder. During waste compression, the first directional valve connects the oil pump to the rodless chamber of the scraper cylinder, while the second directional valve connects both the rodless and rod chambers. This allows the oil pump to simultaneously supply oil to both the rodless and rod chambers of the scraper cylinder, creating a differential oil circuit. This increases the extension rate of the scraper cylinder, thereby improving the scraper's compression efficiency and shortening the overall compression operation time of the waste compression station. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention 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.

[0021] 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 illustrating the working principle of the hydraulic system of the waste compression station provided in this embodiment; Figure 3 This is a partial schematic diagram of the hydraulic system of the waste compression station provided in this embodiment; Figure 4 This is another partial schematic diagram of the hydraulic system of the waste compression station provided in this embodiment; Figure 5 This is another partial schematic diagram of the hydraulic system of the waste compression station provided in this embodiment; Figure 6This is a flowchart illustrating the waste compression station control method provided in this embodiment; Figure 7 This is a partial flowchart of the waste compression station control method provided in this embodiment; Figure 8 This is another partial flowchart of the waste compression station control method provided in this embodiment; Figure 9 This is another partial flowchart of the waste compression station control method provided in this embodiment.

[0022] Icons: 100-Hydraulic system of waste compression station; 110-Oil tank; 120-Oil pump; 121-Fourth flow channel; 130-Scraper cylinder; 140-First reversing valve; 141-First oil supply port; 142-First oil return port; 143-First working oil port; 144-Second working oil port; 145-Second flow channel; 146-Third flow channel; 147-Fifth flow channel; 150-Second reversing valve; 151-First connection port; 152-Second connection port; 153-Third connection port; 154-Fourth connection port; 155-First flow channel; 160-... 1. Overflow oil circuit; 161-First overflow valve; 170-First one-way flow channel; 171-First one-way valve; 180-Second overflow branch; 181-Second overflow valve; 191-Slide plate cylinder; 192-Lifting cylinder; 193-Third directional valve; 194-Fourth directional valve; 195-Balance valve; 196-On / off valve; 197-Fifth directional valve; 198-Second one-way valve; 199-Pressure sensor connector; 300-Garbage compression station; 310-Frame; 311-Support body; 313-Lifting mechanism; 330-Slide plate; 350-Scraper. Detailed Implementation

[0023] In existing technologies, the scraper cylinders of the hydraulic system in a scraper-type waste compactor station are typically connected to the supply and return oil circuits of the hydraulic system via a three-position four-way directional valve. During the waste compaction cycle, the three-position four-way directional valve switches the supply oil circuit and the rodless chamber of the scraper cylinder, while simultaneously connecting the rod chamber of the scraper cylinder to the return oil circuit, thereby driving the scraper rod to extend and compress the waste. During scraper retraction, the three-position four-way directional valve switches again, connecting the supply oil circuit and the rod chamber of the scraper cylinder, while simultaneously connecting the rodless chamber of the scraper cylinder to the return oil circuit, thereby driving the scraper cylinder to retract and reset. However, during the scraper compaction process, the scraper is subjected to a reverse force generated by the waste. This reverse force partially offsets the driving force for scraper compression, leading to a decrease in compression efficiency and thus prolonging the overall compression operation time. Therefore, improving the scraper's compression efficiency has become a pressing technical problem to be solved in this field.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.

[0026] 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.

[0027] In the description of this invention, 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 product of this invention is usually placed, they are only for the convenience of describing this invention 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 invention.

[0028] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0029] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0030] The following detailed description, through embodiments and in conjunction with the accompanying drawings, details the hydraulic system and control method for the waste compression station provided by the present invention, as well as the overall structure, working principle, and technical effects of the waste compression station.

[0031] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the waste compression station 300 provided in this embodiment. This embodiment provides a waste compression station 300, which can be applied in a waste transfer station to achieve waste compression.

[0032] Please refer to Figure 1 and Figure 2In this embodiment, the waste compression station 300 includes a frame 310, a slide plate 330 disposed on the frame 310, a scraper 350 disposed on the slide plate 330, and a waste compression station hydraulic system 100. The waste compression station hydraulic system 100 can drive the frame 310 to lift, the slide plate 330 to move back and forth, and the scraper 350 to rotate relative to the slide plate 330 to perform the waste compression action.

[0033] In this embodiment, the frame 310 includes a support body 311 and a lifting mechanism 313. The slide plate 330 is movably mounted on the lifting mechanism 313 and can move back and forth along the lifting mechanism 313. The scraper 350 is rotatably mounted on the slide plate 330 and can rotate relative to the slide plate 330.

[0034] Please refer to Figure 1 , Figure 2 and Figure 3 In this embodiment, the hydraulic system 100 of the waste compression station includes an oil tank 110, an oil pump 120, a scraper cylinder 130, a first directional valve 140, and a second directional valve 150. The oil tank 110 is used to contain hydraulic oil. The oil pump 120 is connected to the oil tank 110 to draw oil from the tank. The scraper cylinder 130 is used to drive the scraper 350 of the waste compression station 300 to move. Specifically, one end of the scraper cylinder 130 is connected to the slide plate 330, and the other end is connected to the scraper 350. Extending the scraper cylinder 130 can drive the scraper 350 to rotate relative to the slide plate 330 in a first direction to compress waste, while shortening the scraper cylinder 130 can drive the scraper 350 to rotate relative to the slide plate 330 in a second direction. One of the first and second directions is clockwise, and the other is counterclockwise. The first directional valve 140 is connected to the oil tank 110, the oil pump 120, and the rodless chamber of the scraper cylinder 130. The second directional valve 150 is connected to the first directional valve 140, the rodless chamber, and the rod chamber of the scraper cylinder 130. When the scraper 350 compresses waste, the first directional valve 140 connects the oil pump 120 to the rodless chamber of the scraper cylinder 130, while the second directional valve 150 connects the rodless chamber and the rod chamber of the scraper cylinder 130.

[0035] This embodiment incorporates a first reversing valve 140 connected to the oil tank 110, oil pump 120, and rodless chamber of scraper cylinder 130. A second reversing valve 150 is also provided, connected to the first reversing valve 140 and both the rodless and rod chambers of scraper cylinder 130. When scraper 350 compresses waste, the first reversing valve 140 connects the oil pump 120 to the rodless chamber of scraper cylinder 130, while the second reversing valve 150 connects both the rodless and rod chambers of scraper cylinder 130. This connection creates a differential connection circuit, simultaneously supplying oil to both the rodless and rod chambers of scraper cylinder 130. This increases the extension rate of scraper cylinder 130 during waste compression, thereby improving the compression efficiency of scraper 350 and shortening the overall compression operation time of waste compression station 300.

[0036] The specific principle behind simultaneously supplying oil to both the rodless and rod chambers of the scraper cylinder 130 to increase the extension rate of the scraper cylinder 130 is as follows: When oil is supplied to both the rod chamber and the rodless chamber of the scraper cylinder 130 simultaneously, the supply pressures of the rod chamber and the rodless chamber are equal. Since the area of ​​the hydraulic oil in the rodless chamber acting on the piston of the scraper cylinder 130 is larger than that in the rod chamber, according to the pressure calculation formula F=PS (F is pressure, P is force, S is the area of ​​force application), under the same pressure P, the force generated in the rodless chamber is greater, therefore the piston rod will extend towards the rod chamber. When the piston rod extends towards the rod chamber, the oil in the rod chamber will return to the rodless chamber, increasing the oil flow rate in the rodless chamber. According to the hydraulic formula: V=Q / A, where V is velocity, Q is flow rate, and A is the effective working area of ​​the piston, with the effective working area of ​​the piston remaining constant, an increase in flow rate will increase the extension speed of the compression cylinder, thereby achieving a high speed with a small flow rate and improving waste compression efficiency.

[0037] Please refer to Figure 3 and Figure 4In this embodiment, the first directional valve 140 has a first oil supply port 141, a first oil return port 142, a first working oil port 143, and a second working oil port 144. The second directional valve 150 has a first connection port 151, a second connection port 152, and a third connection port 153. The first oil supply port 141 is connected to the oil pump 120, the first oil return port 142 is connected to the oil tank 110, the first working oil port 143 is connected to the rodless chamber of the scraper cylinder 130 through a first flow channel 155, the second working oil port 144 is connected to the first connection port 151 through a second flow channel 145, the second connection port 152 communicates with the rodless chamber of the scraper cylinder 130, and the third connection port 153 is connected to the rod chamber of the scraper cylinder 130. The first directional valve 140 has a first working state in which the first oil supply port 141 is connected to the first working port while the first oil return port 142 is connected to the second working port. The second directional valve 150 has a third working state in which the second connection port 152 and the third connection port 153 are connected. When the scraper cylinder 130 drives the scraper 350 to perform differential garbage compression, the first directional valve 140 is in the first working state and the second directional valve 150 is in the third working state.

[0038] In this embodiment, the second reversing valve 150 also has a fourth working state in which the second connection port 152 is closed while the first connection port 151 and the third connection port 153 are connected. When the scraper cylinder 130 drives the scraper 350 to compress garbage, the first reversing valve 140 is in the first working state and the second reversing valve 150 is in the fourth working state.

[0039] Furthermore, the first directional valve 140 also has a second working state in which the first oil supply port 141 is connected to the second working port and the first oil return port 142 is connected to the first working port; when the scraper cylinder 130 drives the scraper 350 to reset, the first directional valve 140 is in the second working state and the second directional valve 150 is in the fourth working state.

[0040] Specifically, the first directional control valve 140 is an O-type three-position four-way directional control valve. The first supply port 141, the first return port 142, the first working port 143, and the second working port 144 of the O-type three-position four-way directional control valve have three interconnection relationships. Specifically, when the first directional control valve 140 is in the neutral position, the first supply port 141, the first return port 142, the first working port 143, and the second working port 144 are all closed, which is the neutral position of the first directional control valve 140. When the scraper 350 is holding pressure, the first directional control valve 140 is in the neutral position, and the second directional control valve 150 is in the fourth working state.

[0041] The aforementioned selection and connection relationship of the first reversing valve 140 and the second reversing valve 150 facilitates connection and drives the scraper cylinder 130. In particular, when driving the scraper 350 to compress waste, two oil circuit connections are available, allowing for the selection of different connection methods according to different load pressures, thereby improving compression efficiency.

[0042] Of course, in other embodiments of this application, the first directional valve 140 may also be other types of three-position four-way or multi-position multi-way valves, which can be selected according to actual needs.

[0043] Please refer to Figure 2 and Figure 3 In this embodiment, the second directional valve 150 is a two-position four-way directional valve. The second directional valve 150 also has a fourth connection port 154, which is connected to the oil tank 110. In the third operating state, the first connection port 151 and the second connection port 152 are connected, while the third connection port 153 and the fourth connection port 154 are both closed. In the fourth operating state, the second directional valve 150 is closed, while the first connection port 151 and the third connection port 153 are connected.

[0044] In this embodiment, the second reversing valve 150 is selected as a two-position four-way reversing valve, so that both the first reversing valve 140 and the valve block are four-way valves, which makes it easy to integrate the two on the same valve seat and simplifies the setting of the valve seat flow channel.

[0045] Of course, in other embodiments of this application, the second directional valve 150 can also be a two-position three-way directional valve. That is, it can enable the first connection port 151 to selectively connect with the second connection port 152 and the third connection port 153.

[0046] In this embodiment, the first flow channel 155 is connected to a first overflow oil passage 160 that communicates with the oil tank 110. The first overflow oil passage 160 is provided with a first overflow valve 161. When the pressure of the first flow channel 155 is greater than the preset pressure of the first overflow valve 161, the first overflow valve 161 can open to overflow into the oil tank 110.

[0047] This embodiment connects the first overflow oil passage 160 to the first flow channel 155, thus avoiding the problem of pipe bursting due to high oil supply pressure during garbage compression. Most importantly, it ensures that the scraper 350 does not retract under the set maximum reaction force, affecting the compression volume, while also preventing the rodless chamber pressure of the scraper cylinder 130 from continuously rising under load reaction force. This maintains the pressure in the rodless chamber of the scraper cylinder 130 at the set pressure, thereby preventing damage to the scraper cylinder 130.

[0048] Furthermore, the second flow channel 145 is connected to a first one-way flow channel 170 that communicates with the oil tank 110. The first one-way flow channel 170 is provided with a first one-way valve 171, which enables the first one-way flow channel 170 to be opened in the direction of the second flow channel 145.

[0049] In this embodiment, a first one-way flow channel 170 connected to the oil tank 110 is provided in the second flow channel 145. In this way, when the pressure is maintained, the first overflow valve 161 opens to release pressure, and the scraper 350 shortens while replenishing oil to the rod chamber of the scraper cylinder 130 through the first one-way oil passage.

[0050] Please refer to Figure 2 and Figure 3 Furthermore, the second connection port 152 is connected to the first flow channel 155 through the third flow channel 146, so that the second connection port 152 is connected to the rodless cavity of the scraper cylinder 130.

[0051] With the above connection method, there is no need to set up pipelines. You only need to set up the corresponding flow channel on the valve seat to achieve connection, which makes the structure simpler.

[0052] In some other embodiments of this application, the connection between the second connection port 152 and the rodless cavity of the scraper cylinder 130 can also be achieved by connecting a tee to the oil port of the rodless cavity of the scraper cylinder 130, and communicating with the second connection port 152 and the rodless cavity of the scraper cylinder 130 through a pipe.

[0053] Please refer to Figure 2 and Figure 3 In this embodiment, the oil pump 120 is connected to the first oil supply port 141 via a fourth flow channel 121. The fourth flow channel 121 is connected to a second overflow branch 180 that returns to the oil tank 110. The second overflow branch 180 is equipped with a second overflow valve 181. When the pressure in the fourth flow channel 121 is greater than the preset pressure of the second overflow valve 181, the second overflow valve 181 can open to overflow into the oil tank 110. The preset pressure of the first overflow valve 161 is greater than the preset pressure of the second overflow valve 181.

[0054] In this embodiment, the fourth flow channel 121 of the oil pump 120 for oil supply is connected to the second overflow oil circuit, thereby avoiding the problem of damage caused by the pressure of the hydraulic system exceeding the pressure that the system can withstand. Furthermore, the preset pressure of the first overflow valve 161 is made greater than the preset pressure of the second overflow valve 181, allowing the scraper 350 to provide a greater force for compressing the waste.

[0055] The preset pressure of the first relief valve 161 is calculated by back-calculating the maximum reaction force on the scraper cylinder 130 based on the maximum compression force of the scraper 350 calculated in the compression cycle. This ensures that the scraper cylinder 130 will not retract and affect the compression amount under this maximum reaction force.

[0056] Furthermore, the first return port 142 is connected to the oil tank 110 via the fifth flow channel 147. The first one-way flow channel 170 is connected to the fifth flow channel 147, allowing oil to return through the fifth flow channel 147.

[0057] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 In this embodiment, the hydraulic system 100 of the waste compression station also includes a sliding plate cylinder 191, a lifting cylinder 192, a third directional valve 193, and a fourth directional valve 194. One end of the sliding plate cylinder 191 is connected to the lifting mechanism 313 of the frame 310, and the other end is connected to the sliding plate 330. Since the sliding plate 330 moves backward to compress waste, requiring force, the sliding plate cylinder 191 is configured such that oil enters the rodless chamber of the sliding plate cylinder 191 to drive the sliding plate 330 backward to perform the waste compression action. Oil enters the rod chamber of the sliding plate cylinder 191 to drive the sliding plate 330 forward to reset. The third directional valve 193 is a three-position four-way directional valve. The rod chamber and rodless chamber of the sliding plate cylinder 191 are respectively connected to the two working ports of the third directional valve 193, while the oil supply port of the third directional valve 193 is connected to the fourth flow channel 121, and the oil return port of the third directional valve 193 is connected to the fifth flow channel 147. One end of the lifting cylinder 192 is connected to the support body 311, and the other end is connected to the lifting mechanism 313. When the lifting cylinder 192 extends, it can drive the lifting mechanism 313 to raise the slide plate 330 and scraper 350; when the lifting cylinder 192 retracts, it can drive the lifting mechanism 313 to lower the slide plate 330 and scraper 350. The fourth directional valve 194 is a three-position four-way directional valve. The rod-side and rodless-side chambers of the lifting cylinder 192 are respectively connected to the two working ports of the fourth directional valve 194, while the oil supply port of the fourth directional valve 194 is connected to the fourth flow channel 121, and the oil return port of the fourth directional valve 194 is connected to the fifth flow channel 147.

[0058] Secondly, the oil pipes connecting the rodless chamber and the rod chamber of the lifting cylinder 192 and the sliding plate cylinder 191 are both connected to a balance valve 195 and an on / off valve 196. By switching the on / off valve 196, the sliding plate 330 and the lifting mechanism 313 can be lowered under the action of gravitational potential energy. The balance valve 195 is designed to maintain pressure.

[0059] Please refer to Figure 2 and Figure 3 In this embodiment, the hydraulic system 100 of the garbage compression station also includes a fifth directional valve 197, which is a two-position four-way H-type directional valve. The fifth directional valve 197 is connected in the fourth flow channel 121 and the fifth flow channel 147. Furthermore, the fourth flow channel 121 is also provided with a second check valve 198, which can guide the oil supply direction of the oil pump 120 and prevent the hydraulic oil from flowing in the direction of the oil pump 120, thereby avoiding impact on the oil pump 120.

[0060] Secondly, the fourth flow channel 121 is connected to a pressure sensor connector 199 to connect a pressure sensor to detect the pressure of the hydraulic system.

[0061] Please refer to Figures 1 to 3 as well as Figures 6 to 9 This embodiment also provides a control method for a waste compression station 300, which is used to control the waste compression station 300 provided in the above embodiment.

[0062] Please refer to Figures 1 to 3 as well as Figure 6 In the compression sequence, the methods include; S1. Determine if skateboard 330 has moved to the preset position; It should be noted that determining whether the slide plate 330 has moved to the preset position can be done by a proximity switch set at the preset position or by a sensor such as a pull-wire sensor checking the extension length of the slide plate cylinder 191. Taking the proximity switch as an example, when the slide plate 330 moves to the preset position, it will trigger a change in the proximity switch signal, and the position of the slide plate 330 can be determined based on the change in the proximity switch signal. The preset position can be determined based on the size of the trash can, the opening position, and other parameters.

[0063] S2. After the slide plate 330 moves to the preset position, control the first reversing valve 140 to connect the oil pump 120 with the rodless chamber of the scraper cylinder 130, and at the same time control the second reversing valve 150 to connect the rodless chamber and the rod chamber of the scraper cylinder 130. Differential connection can be achieved through the control of the above steps. When the scraper 350 extends, the second reversing valve 150 can make the rodless chamber and the rod chamber of the scraper cylinder 130 enter oil at the same time. By utilizing the area difference between the two chambers of the cylinder, the cylinder can extend quickly, thereby improving the compression efficiency of the scraper 350.

[0064] Specifically, the steps of controlling the first directional valve 140 to connect the oil pump 120 with the rodless chamber of the scraper cylinder 130, and simultaneously controlling the second directional valve 150 to connect the rodless chamber and the rod chamber of the scraper cylinder 130, are as follows: S21. Control the first reversing valve 140 to switch to the first working state, and control the second reversing valve 150 to switch to the third working state.

[0065] It should be noted that the first directional valve 140 and the second directional valve 150 can switch simultaneously. Alternatively, the first directional valve 140 can switch off first, and the second directional valve 150 can switch off after a preset delay. Another option is that the second directional valve 150 can switch off first, and the first directional valve 140 can switch off after a preset delay.

[0066] Please refer to Figures 1 to 3 as well as Figure 7 In this embodiment, it also includes: S3. Obtain the actual pressure of the rodless chamber of scraper cylinder 130; It should be noted that the pressure in the rodless chamber of the scraper cylinder 130 can be obtained through a connected pressure sensor. This pressure sensor can be a pressure sensor that is directly connected to the rodless chamber of the scraper cylinder 130, or it can be a pressure sensor that is indirectly connected to the rodless chamber of the scraper cylinder 130, such as a pressure sensor connected to the fourth flow channel 121.

[0067] S4. Determine whether the actual pressure is greater than or equal to the first preset threshold. S5. When the actual pressure is greater than the first preset threshold, control the second reversing valve 150 to switch to the fourth working state.

[0068] In this embodiment, when the actual pressure is greater than the first preset threshold, the second reversing valve 150 is controlled to switch to the fourth working state. This connects the rodless chamber of the scraper cylinder 130 to the oil pump 120 and the rodless chamber to the oil tank 110. Compared with differential control, this can reduce the flow rate and thus avoid overloading the motor of the oil pump 120.

[0069] It should be noted that while differential connection increases the extension speed, maintaining it when the load increases to a first preset threshold can cause a sharp rise in system pressure, potentially exceeding the safety threshold and affecting system stability. This embodiment cancels the differential connection when the actual pressure exceeds the first preset threshold, reverting the system to standard extension mode with a decrease in speed. This improves the controllability and stability of the action. It also enhances motion control precision, prevents malfunctions, prevents system pressure over-limits, improves hydraulic system safety, reduces hydraulic shock, extends the service life of hydraulic components, and achieves a dynamic balance between energy saving and efficiency.

[0070] Please refer to Figures 1 to 3 as well as Figure 7 In this embodiment, the control method further includes: S6. Determine whether the actual pressure is greater than or equal to the second preset threshold; wherein the second preset threshold is greater than the first preset threshold; S7. When the actual pressure is greater than or equal to the second preset threshold, the speed of the oil pump 120 is reduced to the first preset speed and then maintained.

[0071] In this embodiment, when the actual pressure is greater than or equal to the second preset threshold, the rotational speed of the oil pump 120 is reduced, which can decrease the flow rate and avoid a surge in system pressure, thereby improving the problems of overload and pipe burst. It also enables pressure maintenance.

[0072] It should be noted that the reduction in the speed of oil pump 120 refers to the reduction in the speed of the motor of oil pump 120. This reduction can be achieved by gradually decreasing the speed to the first preset speed at a fixed rate, or by directly and rapidly reducing the speed to the first preset speed.

[0073] Please refer to Figures 1 to 3 as well as Figure 8 In this embodiment, the control method further includes: S8. Determine whether the actual pressure is greater than or equal to the third preset threshold; wherein the third preset threshold is greater than the second preset threshold; S9. When the actual pressure is greater than or equal to the third preset threshold, control the first directional valve 140 to switch to the neutral position. In this embodiment, by controlling the first reversing valve 140 to switch to the neutral position to maintain pressure when the actual pressure is greater than or equal to a third preset threshold, pipe bursts can be avoided and the compaction of waste can be improved.

[0074] Please refer to Figures 1 to 3 as well as Figure 8 In this embodiment, the control method further includes: S10. Determine whether the skateboard 330 has moved to the compression cutoff position; It should be noted that during the waste compression cycle, after the scraper 350 tilts down to its final position, it must remain in that position. Then, the sliding plate cylinder 191 will control the sliding plate 330 to move towards the compression cutoff position to continue compressing the waste. Whether the sliding plate 330 has reached the compression cutoff position can be determined by combining the sliding plate's stroke with time control, by using a proximity switch located at the compression cutoff position, or by the system pressure. This embodiment does not impose specific limitations on how the sliding plate 330 is determined to have reached the compression cutoff position.

[0075] S11. After the slide plate 330 moves to the compression cutoff position, control the first reversing valve 140 to switch to the second working state, and increase the speed of the oil pump 120 to the second preset speed; wherein, the second preset speed is greater than the first preset speed; S12. Determine if the scraper 350 has flipped up to the correct position; It should be noted that the determination of whether the scraper 350 has flipped up to the correct position is achieved by a proximity switch set at a specific location.

[0076] S13. After the scraper 350 is flipped up to the correct position, control the first reversing valve 140 to switch to the neutral position.

[0077] In this embodiment, after the pressure holding period ends, the first directional valve 140 is switched to the second working state, and the speed of the oil pump 120 is increased to the second preset speed, thus enabling the scraper 350 to flip up quickly. It should be noted that the PQ pressure-flow curve of the hydraulic system during garbage compression by the scraper 350 generally exhibits three segments with significantly different trends. The first segment is the initial stage, where the load is small, the system pressure is at a low level, and a large flow of oil is supplied to the rod chamber of the scraper cylinder 130 through the pressure difference between the rodless and rod chambers, quickly establishing a base pressure to prepare for subsequent compression actions. The second segment is the main compression stage; as the scraper 350 continuously squeezes the garbage, the system pressure gradually increases, but the pressure increase is relatively gradual due to the gradual densification of the garbage. The third segment is the final stage of the compression cycle; when the garbage is close to filling the garbage bin, the compressible space decreases sharply, and the system pressure enters a rapid increase period, with a significant surge compared to the second segment.

[0078] Based on the pressure-flow curve characteristics described above, this embodiment sets three key thresholds: a first preset threshold, a second preset threshold, and a third preset threshold. The first preset threshold is used as the transition node between the first and second segments, and the second preset threshold is used as the dividing point between the second and third segments. The first preset threshold is less than the second preset threshold. The third preset threshold is used as the cutoff point for the scraper 350 compression, and the third preset threshold is greater than the second preset threshold.

[0079] The first preset threshold is directly related to the motor power of the driving oil pump 120, and its core function is to prevent the oil pump 120 motor from overloading. In the initial compression stage, the differential pressure connection can quickly establish the working pressure; however, when the oil circuit pressure exceeds the first preset threshold, the motor load of the oil pump 120 will increase significantly with the pressure increase. At this time, the second reversing valve 150 is switched to the fourth working state, connecting the rod chamber of the scraper cylinder 130 back to the oil tank 110. This reduces the flow rate of the oil supply circuit, thereby reducing the motor load of the oil pump 120, while ensuring that the oil circuit pressure continues to rise, meeting the compression requirements of the scraper 350 for the garbage. The second preset threshold is closely related to the amount of garbage compressed. When the garbage bin is about to be full, the compressible stroke of the scraper 350 is significantly shortened, and the scraper cylinder 130 faces the risk of overload. To address this, when the pressure exceeds the second preset threshold, the system automatically reduces the speed of the oil pump 120. By reducing the flow output, the rate of pressure increase is slowed, stabilizing the pressure change in the third segment of the PQ curve and mitigating the surge problem. The oil pump 120 maintains operation at the reduced second preset speed, achieving slow compression of residual waste. This ensures compression effectiveness while avoiding cylinder overload. The third preset threshold serves as the cutoff point for the scraper 350 to reach its compression limit and is related to the amount of waste compressed. Once the actual pressure reaches the preset pressure, the scraper 350 can be stopped from compressing, thus preventing pipe bursts and overload of the scraper cylinder 130.

[0080] In this embodiment, the first preset threshold is 16 MPa, the second preset threshold is 20 MPa, and the third preset threshold is 21 MPa. Of course, in other embodiments of this application, the values ​​of the first, second, and third preset thresholds are set according to requirements.

[0081] It should also be noted that when the actual pressure is less than the second preset threshold, the speed of oil pump 120 is greater than the first preset speed. This increases the flow rate and quickly builds up system pressure. In this embodiment, the first preset speed is 1000 r / min, while the speed of oil pump 120 is 1500 r / min in the first two stages when the actual pressure is less than the second preset threshold. When the actual pressure is greater than the second preset threshold, reducing the speed of oil pump 120 can mitigate the surge in system pressure in the third stage, preventing pipe bursts and overload. When scraper 350 resets, increasing the speed of oil pump 120 to the second preset speed can quickly build up pressure and drive scraper 350 to reset. In this embodiment, the second preset speed is set to 1500 r / min. The pressure holding time can be set according to requirements, such as the type of waste, and can be adjusted as needed.

[0082] Secondly, it should be noted that since the system pressure is continuously increasing, steps S1 to S9 are executed sequentially.

[0083] In summary, this application provides a first directional valve 140, which is connected to the oil tank 110, oil pump 120, and rodless chamber of scraper cylinder 130. A second directional valve 150 is also provided, connecting the tank, the rodless chamber, and the rod chamber of scraper cylinder 130 respectively. When scraper 350 compresses waste, the first directional valve 140 connects oil pump 120 to the rodless chamber of scraper cylinder 130, while the second directional valve 150 connects the rodless chamber and the rod chamber of scraper cylinder 130. This connection creates a differential connection circuit, simultaneously supplying oil to both the rodless and rod chambers of scraper cylinder 130. This increases the extension rate of scraper cylinder 130, thereby improving the compression efficiency of scraper 350 and shortening the overall compression operation time of waste compression station 300.

[0084] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulic system for a waste compression station, characterized in that, include: Fuel tank (110); An oil pump (120) is connected to the oil tank (110); Scraper cylinder (130) is used to drive the scraper (350) of the waste compression station to move; The first directional valve (140) is connected to the rodless chamber of the oil tank (110), the oil pump (120) and the scraper cylinder (130); The second directional valve (150) is connected to the rodless chamber and the rod chamber of the first directional valve (140) and the scraper cylinder (130); When the scraper (350) compresses the waste, the first reversing valve (140) connects the oil pump (120) to the rodless chamber of the scraper cylinder (130), while the second reversing valve (150) connects the rodless chamber and the rod chamber of the scraper cylinder (130).

2. The hydraulic system for a waste compression station according to claim 1, characterized in that, The first reversing valve (140) has a first oil supply port (141), a first oil return port (142), a first working oil port (143), and a second working oil port (144), and the second reversing valve (150) has a first connection port (151), a second connection port (152), and a third connection port (153). The first oil supply port (141) is connected to the oil pump (120), the first oil return port (142) is connected to the oil tank (110), the first working oil port (143) is connected to the rodless chamber of the scraper cylinder (130) through the first flow channel (155), the second working oil port (144) is connected to the first connection port (151) through the second flow channel (145), the second connection port (152) is connected to the rodless chamber of the scraper cylinder (130), and the third connection port (153) is connected to the rod chamber of the scraper cylinder (130). The first reversing valve (140) has a first working state in which the first oil supply port (141) is connected to the first working port and the first oil return port (142) is connected to the second working port. The second reversing valve (150) has a third operating state in which the second connection port (152) and the third connection port (153) are connected; When the scraper cylinder (130) drives the scraper (350) to perform differential garbage compression, the first reversing valve (140) is in the first working state, and the second reversing valve (150) is in the third working state.

3. The hydraulic system for a waste compression station according to claim 2, characterized in that, The second reversing valve (150) also has a fourth working state in which the second connection port (152) is closed while the first connection port (151) and the third connection port (153) are connected; When the scraper cylinder (130) drives the scraper (350) to compress garbage, the first reversing valve (140) is in the first working state, and the second reversing valve (150) is in the fourth working state.

4. The hydraulic system for a waste compression station according to claim 2, characterized in that, The first reversing valve (140) also has a second working state in which the first oil supply port (141) is connected to the second working port while the first oil return port (142) is connected to the first working port. The second reversing valve (150) also has a fourth working state in which the second connection port (152) is closed while the first connection port (151) and the third connection port (153) are connected; when the scraper cylinder (130) drives the scraper (350) to reset, the first reversing valve (140) is in the second working state and the second reversing valve (150) is in the fourth working state.

5. The hydraulic system for a waste compression station according to claim 2, characterized in that, The first flow channel (155) is connected to a first overflow oil passage (160) that communicates with the oil tank (110). The first overflow oil passage (160) is provided with a first overflow valve (161). When the pressure in the first flow channel (155) is greater than the preset pressure of the first overflow valve (161), the first overflow valve (161) can open to overflow into the oil tank (110). And / or, The second flow channel (145) is connected to a first one-way flow channel (170) that communicates with the oil tank (110). The first one-way flow channel (170) is provided with a first one-way valve (171), which enables the first one-way flow channel (170) to be open in the direction of the second flow channel (145).

6. The hydraulic system for a waste compression station according to claim 2, characterized in that, The first directional valve (140) is an O-type three-position four-way directional valve. The first directional valve (140) also has a neutral position where the first oil supply port (141), the first oil return port (142), the first working oil port (143), and the second working oil port (144) are all closed. The second directional valve (150) also has a fourth working state where the second connection port (152) is closed while the first connection port (151) and the third connection port (153) are connected. When the scraper (350) is under pressure, the first reversing valve (140) is in the neutral position and the second reversing valve (150) is in the fourth working state.

7. The hydraulic system for a waste compression station according to claim 2, characterized in that, The first flow channel (155) is connected to a first overflow oil passage (160) that communicates with the oil tank (110). The first overflow oil passage (160) is provided with a first overflow valve (161). When the pressure in the first flow channel (155) is greater than the preset pressure of the first overflow valve (161), the first overflow valve (161) can open to overflow into the oil tank (110). The oil pump (120) is connected to the first oil supply port (141) through the fourth flow channel (121); the fourth flow channel (121) is connected to a second overflow branch (180) that returns to the oil tank (110), and the second overflow branch (180) is provided with a second overflow valve (181). When the pressure in the fourth flow channel (121) is greater than the preset pressure of the second overflow valve (181), the second overflow valve (181) can open to overflow to the oil tank (110); The preset pressure of the first relief valve (161) is greater than the preset pressure of the second relief valve (181).

8. A waste compression station, characterized in that, The system includes a frame (310), a slide plate (330) disposed on the frame (310), and a scraper (350) disposed on the slide plate (330), as well as the hydraulic system of the waste compression station according to any one of claims 1-7. The scraper cylinder (130) is connected to the slide plate (330) and the scraper (350) respectively. When the scraper cylinder (130) extends, it can drive the scraper (350) to rotate relative to the slide plate (330) to compress waste. When the scraper cylinder (130) retracts, it can drive the scraper (350) to reset.

9. A control method for a waste compression station, characterized in that, For control of the waste compression station as described in claim 8; In the compression loop, the method includes: Determine whether the skateboard (330) has moved to the preset position; After the slide plate (330) moves to the preset position, the first reversing valve (140) is controlled to connect the oil pump (120) with the rodless chamber of the scraper cylinder (130), while the second reversing valve (150) is controlled to connect the rodless chamber and the rod chamber of the scraper cylinder (130).

10. The waste compression station control method according to claim 9, characterized in that, The first reversing valve (140) has a first oil supply port (141), a first oil return port (142), a first working oil port (143), and a second working oil port (144), and the second reversing valve (150) has a first connection port (151), a second connection port (152), and a third connection port (153). The first oil supply port (141) is connected to the oil pump (120), the first oil return port (142) is connected to the oil tank (110), the first working oil port (143) is connected to the rodless chamber of the scraper cylinder (130) through the first flow channel (155), the second working oil port (144) is connected to the first connection port (151) through the second flow channel (145), the second connection port (152) is connected to the rodless chamber of the scraper cylinder (130), and the third connection port (153) is connected to the rod chamber of the scraper cylinder (130). The first reversing valve (140) has a first working state in which the first oil supply port (141) is connected to the first working port and the first oil return port (142) is connected to the second working port. The second reversing valve (150) has a third operating state in which the second connection port (152) and the third connection port (153) are connected; The step of controlling the first reversing valve (140) to connect the oil pump (120) with the rodless chamber of the scraper cylinder (130) while simultaneously controlling the second reversing valve (150) to connect the rodless chamber and the rod chamber of the scraper cylinder (130) includes: Control the first reversing valve (140) to switch to the first working state, and control the second reversing valve (150) to switch to the third working state.

11. The waste compression station control method according to claim 10, characterized in that, The second reversing valve (150) also has a fourth working state in which the second connection port (152) is closed while the first connection port (151) and the third connection port (153) are connected; The method further includes: Obtain the actual pressure of the rodless chamber of the scraper cylinder (130); Determine whether the actual pressure is greater than or equal to a first preset threshold; When the actual pressure is greater than the first preset threshold, the second reversing valve (150) is controlled to switch to the fourth working state.

12. The waste compression station control method according to claim 11, characterized in that, The method further includes: Determine whether the actual pressure is greater than or equal to a second preset threshold; wherein the second preset threshold is greater than the first preset threshold; When the actual pressure is greater than or equal to the second preset threshold, the speed of the oil pump (120) is controlled to be reduced to the first preset speed and then maintained.

13. The waste compression station control method according to claim 12, characterized in that, The first reversing valve (140) also has a neutral position where the first oil supply port (141), the first oil return port (142), the first working oil port (143) and the second working oil port (144) are all closed; The first reversing valve (140) also has a second working state in which the first oil supply port (141) is connected to the second working port while the first oil return port (142) is connected to the first working port. The method further includes: Determine whether the actual pressure is greater than or equal to a third preset threshold; wherein the third preset threshold is greater than the second preset threshold; When the actual pressure is greater than or equal to the third preset threshold, the first reversing valve (140) is controlled to switch to the neutral position. Determine whether the slide plate (330) has moved to the compression cutoff position; After the slide plate (330) moves to the compression cutoff position, the first reversing valve (140) is controlled to switch to the second working state, and the speed of the oil pump (120) is increased to the second preset speed; wherein, the second preset speed is greater than the first preset speed; Determine whether the scraper (350) has flipped up to the correct position; After the scraper (350) is flipped up into position, the first reversing valve (140) is controlled to switch to the neutral position.

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