Compression type garbage truck hydraulic system, noise reduction method and compression type garbage truck

Abstract

The invention relates to the technical field of hydraulic noise reduction, and provides a compression garbage truck hydraulic system, a noise reduction method and a compression garbage truck. The hydraulic system of the compression garbage truck comprises at least one hydraulic power assembly and an electrical control assembly, the hydraulic power assembly comprises at least one hydraulic cylinder, and a magnetostriction sensor is arranged in the hydraulic cylinder and used for measuring the telescopic position of the hydraulic cylinder; the electric control assembly comprises at least one electro-hydraulic proportional valve, the electro-hydraulic proportional valves communicate with the hydraulic cylinders in a one-to-one correspondence mode, the electro-hydraulic proportional valves are in signal connection with the magnetostriction sensors, and the electro-hydraulic proportional valves are used for controlling the stretching speed of the hydraulic cylinders. According to the hydraulic system of the compression garbage truck, the defect that the noise reduction effect of a hydraulic cylinder in the prior art is not obvious enough is overcome, and the noise can be obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic noise reduction, and in particular to a hydraulic system of a compression type garbage truck, a noise reduction method and a compression type garbage truck. Background Art

[0002] The hydraulic system of a compression garbage truck is an indispensable system for compression garbage trucks. When the piston rod of the hydraulic cylinder in the hydraulic system extends or contracts too fast, it will cause noise. In order to reduce the noise of the hydraulic cylinder, the existing technology is to set a buffer structure in the hydraulic cylinder. However, this method has limited buffering effect and the noise reduction effect is not significant enough. Summary of the invention

[0003] The present invention provides a compression type garbage truck hydraulic system, a noise reduction method and a compression type garbage truck, so as to solve the defect that the noise reduction effect of the hydraulic cylinder in the prior art is not significant enough, and realize a compression type garbage truck hydraulic system which can significantly reduce noise.

[0004] The present invention provides a hydraulic system for a compression garbage truck, comprising at least one hydraulic power assembly and an electrical control assembly, wherein the hydraulic power assembly comprises at least one hydraulic cylinder, wherein a magnetostrictive sensor is arranged inside the hydraulic cylinder, and the magnetostrictive sensor is used to measure the telescopic position of the hydraulic cylinder; the electrical control assembly comprises at least one electro-hydraulic proportional valve, wherein the electro-hydraulic proportional valve is connected to the hydraulic cylinder in a one-to-one correspondence, the electro-hydraulic proportional valve is connected to the magnetostrictive sensor signal, and the electro-hydraulic proportional valve is used to control the telescopic speed of the hydraulic cylinder.

[0005] According to a hydraulic system for a compression garbage truck provided by the present invention, the electro-hydraulic proportional valve is used to switch between a first state, a second state and a third state. In the first state, the hydraulic cylinder is in a static state; in the second state, the electro-hydraulic proportional valve controls the hydraulic cylinder to contract; in the third state, the electro-hydraulic proportional valve controls the hydraulic cylinder to extend.

[0006] According to a hydraulic system for a compression garbage truck provided in the present invention, the hydraulic cylinder includes a cylinder body, a piston is slidably provided inside the cylinder body, the piston divides the internal cavity of the cylinder body into a rod cavity and a rodless cavity, and the piston is provided with a piston rod on the side facing the rod cavity; in the second state, the oil outlet of the electro-hydraulic proportional valve is connected to the rod cavity, and the oil return port of the electro-hydraulic proportional valve is connected to the rodless cavity; in the third state, the oil outlet of the electro-hydraulic proportional valve is connected to the rodless cavity, and the oil return port of the electro-hydraulic proportional valve is connected to the rodless cavity.

[0007] According to a hydraulic system of a compression garbage truck provided by the present invention, a one-way throttle valve is provided between the hydraulic cylinder and the electro-hydraulic proportional valve, and the one-way throttle valve is used to control the flow of hydraulic oil between the hydraulic cylinder and the electro-hydraulic proportional valve.

[0008] According to a hydraulic system for a compression garbage truck provided by the present invention, a hydraulic lock is provided between the one-way throttle valve and the electro-hydraulic proportional valve, and the hydraulic lock is used to lock the flow of hydraulic oil between the hydraulic cylinder and the electro-hydraulic proportional valve.

[0009] According to a hydraulic system of a compression garbage truck provided by the present invention, the electrical control component also includes an oil tank, an oil pipeline and an oil return pipe, the oil pipeline includes a main pipeline, the main pipeline is provided with a low-noise oil pump, one end of the main pipeline is connected to the oil tank, and the other end is connected to a first branch and a second branch; the first branch is connected to the first oil port of the electro-hydraulic proportional valve, and the second branch is connected to the second oil port of the electro-hydraulic proportional valve; one end of the oil return pipe is connected to the oil tank, and the other end is connected to the second oil port of the electro-hydraulic proportional valve.

[0010] According to a hydraulic system of a compression garbage truck provided by the present invention, the hydraulic power assembly includes three hydraulic cylinders, and the three hydraulic cylinders are used to control the scraper, the slide plate and the feeding mechanism to work in a one-to-one correspondence.

[0011] According to a hydraulic system for a compression type garbage truck provided by the present invention, an overflow valve is provided between the main pipeline and the oil return pipe.

[0012] The present invention also provides a noise reduction method, comprising: Set the following parameters: the starting current value is H1, the maximum current value is H2, the starting buffer stroke is S1, the middle stroke is S2, the final buffer stroke is S3, the starting buffer time is T1, and the final buffer time is T2; where S2 = total stroke - S1 - S3; When the hydraulic cylinder begins to extend or contract, the magnetostrictive sensor measures the initial position of the hydraulic cylinder, and the electro-hydraulic proportional valve controls the hydraulic cylinder to accelerate extension or contraction according to the starting ramp signal determined by H1, H2, S1 and T1; When the hydraulic cylinder is extended or contracted to the position a, the dividing point between S1 and S2, the magnetostrictive sensor feeds back a signal to the electro-hydraulic proportional valve. After receiving the signal, the electro-hydraulic proportional valve adjusts the current of the electro-hydraulic proportional valve to H2. The electro-hydraulic proportional valve controls the hydraulic cylinder to accelerate to the first speed and then extend or contract at a uniform speed at the first speed. When the hydraulic cylinder extends or contracts to the dividing point b between S2 and S3, the magnetostrictive sensor feeds back a signal to the electro-hydraulic proportional valve, which controls the hydraulic cylinder to decelerate and extend or contract according to the end ramp signal determined by H2, S3 and T2.

[0013] The present invention further provides a compression type garbage truck, comprising the compression type garbage truck hydraulic system as described in any one of the above embodiments.

[0014] The hydraulic system of the compression garbage truck provided by the present invention sets a magnetostrictive sensor inside the hydraulic cylinder so that the magnetostrictive sensor can sense the stroke of the hydraulic cylinder without being affected by the external working environment, thereby ensuring the smooth progress of the detection process. Secondly, by setting the magnetostrictive sensor to feedback the information of the full stroke of the hydraulic cylinder in real time, it is not limited by the traditional sensing component that can only feedback fixed position information. Furthermore, the magnetostrictive sensor can be controlled more accurately through the coordinated control of the electro-hydraulic proportional valve, and the hydraulic cylinder can be started and stopped slowly, thereby greatly improving the noise reduction effect. On the other hand, since the electro-hydraulic proportional valve and the magnetostrictive sensor can be controlled in the form of electronic numbers, the buffer stroke, buffer time, starting current and other parameters can be modified in the background through a display screen or buttons, so as to adjust the buffer noise reduction effect of the hydraulic cylinder according to actual needs.

[0015] Furthermore, the noise reduction method provided by the present invention is implemented based on the above-mentioned compression garbage truck hydraulic system, and therefore also has the beneficial effects described in the above-mentioned compression garbage truck hydraulic system.

[0016] Furthermore, the compression type garbage truck provided by the present invention includes the above-mentioned compression type garbage truck hydraulic system, and therefore also has the beneficial effects described in the above-mentioned compression type garbage truck hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the electro-hydraulic proportional valve in the hydraulic system of the compression type garbage truck provided by the present invention in the first state.

[0019] Figure 2 It is a structural schematic diagram of the electro-hydraulic proportional valve in the hydraulic system of the compression type garbage truck provided by the present invention in the second state.

[0020] Figure 3 This is one of the structural schematic diagrams of the electro-hydraulic proportional valve in the hydraulic system of the compression type garbage truck provided by the present invention in the third state.

[0021] Figure 4This is the second structural schematic diagram of the electro-hydraulic proportional valve in the hydraulic system of the compression type garbage truck provided by the present invention in the third state.

[0022] Figure numerals: 100: hydraulic power assembly; 110: hydraulic cylinder; 111: cylinder body; 112: piston rod; 113: piston; 114: rod chamber; 115: rodless chamber; 120: one-way throttle valve; 130: hydraulic lock; 200: electrical control assembly; 210: oil tank; 220: low-noise oil pump; 230: oil pipeline; 240: oil return pipe; 250: electro-hydraulic proportional valve; 260: overflow valve; 270: one-way valve; 300: slide plate; 400: scraper; 500: feeding mechanism. DETAILED DESCRIPTION

[0023] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0026] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0028] Combine the following Figure 1-Figure 4 The present invention describes a hydraulic system for a compression type garbage truck.

[0029] Figure 1 The schematic diagram of the structure of the electro-hydraulic proportional valve in the hydraulic system of the compression garbage truck provided by the embodiment of the present invention in the first state is illustrated. Figure 1 The hydraulic system of a compression garbage truck provided by the present invention includes: at least one hydraulic power assembly 100 and an electrical control assembly 200. The hydraulic power assembly 100 includes at least one hydraulic cylinder 110, and a magnetostrictive sensor is provided inside the hydraulic cylinder 110, and the magnetostrictive sensor is used to measure the telescopic position of the hydraulic cylinder 110; the electrical control assembly 200 includes at least one electro-hydraulic proportional valve 250, and the electro-hydraulic proportional valve 250 is connected to the hydraulic cylinder 110 in a one-to-one correspondence, and the electro-hydraulic proportional valve 250 is connected to the magnetostrictive sensor signal, and the electro-hydraulic proportional valve 250 is used to control the telescopic speed of the hydraulic cylinder 110.

[0030] It should be noted that the specific number of hydraulic power assemblies 100 can be determined according to actual conditions. Specifically, there can be three hydraulic power assemblies 100, and each hydraulic power assembly 100 includes two hydraulic cylinders 110, and the two hydraulic cylinders 110 are connected to the same electro-hydraulic proportional valve 250, that is, the two hydraulic cylinders 110 move synchronously under the control of the same electro-hydraulic proportional valve 250, thereby providing greater push-pull force. When there are three hydraulic power assemblies 100, the three hydraulic power assemblies 100 are connected to the slide 300, the scraper 400 and the feeding mechanism 500 in turn, so as to perform different tasks. Correspondingly, there are also three electro-hydraulic proportional valves 250, and the three electro-hydraulic proportional valves 250 are arranged in parallel with the oil supply system of the electrical control assembly 200, and the three electro-hydraulic proportional valves 250 independently control the operation of the three hydraulic power assemblies 100.

[0031] Specifically, the magnetostrictive sensor includes a metal waveguide wire and a permanent magnet. Among them, the permanent magnet is arranged on the piston or piston rod inside the hydraulic cylinder 110. When the displacement needs to be measured, the internal circuit of the magnetostrictive sensor will send a short current pulse to the waveguide wire, which will generate a circular magnetic field around the waveguide wire. The permanent magnet slides along the waveguide wire as the piston or piston rod moves. When the magnetic field generated by the current meets the magnetic field of the permanent magnet, a mechanical stress wave, i.e., an ultrasonic wave, will be generated on the waveguide wire. This ultrasonic wave propagates along the waveguide wire to both ends and is reflected back after encountering the end point of the waveguide wire. The detection device in the magnetostrictive sensor can capture the returned ultrasonic signal. By measuring the time difference from the emission of the current pulse to the reception of the echo, combined with the known sound speed, the position of the permanent magnet relative to the fixed end of the magnetostrictive sensor can be accurately calculated. Finally, this position information is output in the form of a digital or analog signal and transmitted to the electro-hydraulic proportional valve 250, and the electro-hydraulic proportional valve 250 controls the movement speed of the piston of the hydraulic cylinder 110 by controlling the oil supply, that is, the speed of the expansion and contraction of the hydraulic cylinder 110.

[0032] The present invention sets the magnetostrictive sensor inside the hydraulic cylinder 110, so that the magnetostrictive sensor's sensing of the hydraulic cylinder 110 stroke is not affected by the external working environment, ensuring the smooth progress of the detection process. Secondly, by setting the magnetostrictive sensor to feedback the information of the full stroke of the hydraulic cylinder 110 in real time, it is not limited by the traditional sensing component that can only feedback fixed position information. Furthermore, the magnetostrictive sensor can be controlled more accurately through the coordinated control with the electro-hydraulic proportional valve 250, and the hydraulic cylinder 110 can be started and stopped slowly, thereby greatly improving the noise reduction effect. On the other hand, since the electro-hydraulic proportional valve 250 and the magnetostrictive sensor can be controlled in digital form, the parameters such as the buffer stroke, buffer time, and starting current can be modified in the background through a touch screen or buttons, so as to adjust the buffer noise reduction effect of the hydraulic cylinder 110 according to actual needs.

[0033] Figure 2 The schematic diagram of the structure of the electro-hydraulic proportional valve in the hydraulic system of a compression garbage truck provided by an embodiment of the present invention in the second state is illustrated. Figure 3 One of the structural schematic diagrams of the electro-hydraulic proportional valve in the hydraulic system of a compression garbage truck provided by an embodiment of the present invention in the third state is illustrated.

[0034] Reference Figures 1 to 3 In some embodiments of the present invention, the electro-hydraulic proportional valve 250 is used to switch between a first state, a second state and a third state. In the first state, the hydraulic cylinder 110 is in a stationary state; in the second state, the electro-hydraulic proportional valve 250 controls the hydraulic cylinder 110 to contract; in the third state, the electro-hydraulic proportional valve 250 controls the hydraulic cylinder 110 to extend.

[0035] Specifically, refer to Figure 1 When the electro-hydraulic proportional valve 250 is turned to Figure 1 When the electric control assembly 200 is in the position shown, the oil supply system inside the electric control assembly 200 will directly return to the oil tank after passing through the electro-hydraulic proportional valve 250, and will not be delivered to the hydraulic cylinder 110. Therefore, when the electro-hydraulic proportional valve 250 is in the first state, the hydraulic cylinder 110 is in a static state and will not be extended or retracted. Figure 2 When the electro-hydraulic proportional valve 250 is turned to Figure 2 When the electric control assembly 200 is in the position shown, the oil supply system inside the electric control assembly 200 will deliver the hydraulic oil to the inside of the hydraulic cylinder 110, and the hydraulic cylinder 110 will perform a contraction action. Figure 3 When the hydraulic cylinder 110 is in the position shown, the oil supply system inside the electrical control assembly 200 will deliver the hydraulic oil to the inside of the hydraulic cylinder 110, and at this time the hydraulic cylinder 110 performs an extension action.

[0036] Reference Figure 1In some embodiments of the present invention, the hydraulic cylinder 110 includes a cylinder body 111, in which a piston 113 is slidably provided, and the piston 113 divides the internal cavity of the cylinder body 111 into a rod cavity 114 and a rodless cavity 115, and the piston 113 is provided with a piston rod 112 on the side facing the rod cavity 114; in the second state, the oil outlet of the electro-hydraulic proportional valve 250 is connected to the rod cavity 114, and the oil return port of the electro-hydraulic proportional valve 250 is connected to the rodless cavity 115; in the third state, the oil outlet of the electro-hydraulic proportional valve 250 is connected to the rodless cavity 115, and the oil return port of the electro-hydraulic proportional valve 250 is connected to the rodless cavity 114.

[0037] A one-way throttle valve 120 is provided between the hydraulic cylinder 110 and the electro-hydraulic proportional valve 250, and the one-way throttle valve 120 is used to control the flow of hydraulic oil between the hydraulic cylinder 110 and the electro-hydraulic proportional valve 250. A hydraulic lock 130 is provided between the one-way throttle valve 120 and the electro-hydraulic proportional valve 250, and the hydraulic lock 130 is used to lock the flow of hydraulic oil between the hydraulic cylinder 110 and the electro-hydraulic proportional valve 250.

[0038] Specifically, the piston 113 divides the internal space of the hydraulic cylinder 110 into two parts: the rod chamber 114 and the rodless chamber 115. The electro-hydraulic proportional valve 250 realizes the extension and retraction of the piston rod 112 by controlling the direction of the oil circuit. In the second state, oil is supplied to the rod chamber 114 and the rodless chamber 115 is returned, so that the piston 113 shrinks inward; in the third state, the high-pressure oil is guided to the rodless chamber 115, and the rod chamber 114 is allowed to return oil, so that the piston 113 moves outward. The one-way throttle valve 120 is installed between the hydraulic cylinder 110 and the electro-hydraulic proportional valve 250, which can accurately adjust the flow rate of the hydraulic oil to ensure smooth and controllable action. In addition, a hydraulic lock 130 is set between the one-way throttle valve 120 and the electro-hydraulic proportional valve 250, which can lock the current hydraulic oil flow when needed, effectively keeping the position of the piston 113 unchanged, thereby enhancing the stability and safety of the system.

[0039] This embodiment realizes the high adjustability of the movement direction and speed of the piston 113 through the electro-hydraulic proportional valve 250, thereby improving the operation accuracy; the application of the one-way throttle valve 120 further improves the smoothness of the action process; and the presence of the hydraulic lock 130 ensures that the position of the piston 113 remains unchanged even when the external pressure changes, greatly improving the reliability and stability of the entire system. These features work together to greatly improve the control accuracy of this embodiment.

[0040] Reference Figure 1In some embodiments of the present invention, the electrical control assembly 200 further includes an oil tank 210, an oil delivery pipe 230 and an oil return pipe 240. The oil delivery pipe 230 includes a main pipeline, and the main pipeline is provided with a low-noise oil pump 220. One end of the main pipeline is connected to the oil tank 210, and the other end is connected with a first branch and a second branch. The first branch is connected to the first oil port of the electro-hydraulic proportional valve 250, and the second branch is connected to the second oil port of the electro-hydraulic proportional valve 250. One end of the oil return pipe 240 is connected to the oil tank 210, and the other end is connected to the second oil port of the electro-hydraulic proportional valve 250. Among them, the first branch is provided with a one-way valve 270, and a relief valve 260 is provided between the main pipeline and the oil return pipe 240.

[0041] In the above structure, precise control of the hydraulic system of the compression garbage truck is achieved through the circulation of hydraulic oil. When working, the low-noise oil pump 220 draws hydraulic oil from the oil tank 210 and distributes the pressurized hydraulic oil to the first branch and the second branch through the main pipeline. In this process, the one-way valve 270 ensures that the hydraulic oil can only flow along the first branch to the first oil port of the electro-hydraulic proportional valve 250, effectively preventing the occurrence of backflow. The electro-hydraulic proportional valve 250 accurately adjusts the hydraulic oil flow or pressure between the two oil ports according to the input electrical signal, thereby controlling the action characteristics of the actuator such as the hydraulic cylinder. When the pressure in the system exceeds the predetermined safety range, the overflow valve 260 automatically opens, allowing the excess hydraulic oil to return to the oil tank 210 through the return oil pipe 240, ensuring the safe operation of the entire system.

[0042] This embodiment not only improves the overall efficiency of the system, but also enhances its reliability and safety. First, the use of a low-noise oil pump 220 significantly reduces operating noise, providing users with a quieter working environment, while also reducing energy loss and achieving the goal of high efficiency and energy saving. Secondly, the use of the electro-hydraulic proportional valve 250 makes the adjustment of parameters such as output torque or displacement more flexible and precise, which is particularly important for applications requiring high-precision control. In addition, the reasonable configuration of the one-way valve 270 and the overflow valve 260 further enhances the stability of the system. The former prevents unnecessary reverse flow of hydraulic oil, and the latter serves as the last line of defense, providing protection in the face of abnormally high pressure conditions and avoiding the risk of equipment damage.

[0043] In some possible embodiments, by installing high-precision pressure sensors and flow meters at key locations such as the oil pump outlet, before and after the electro-hydraulic proportional valve 250, and the oil return pipe 240, the system can monitor and feedback the status of these important parameters in real time. This integrated sensor network not only provides rich data support for the control system, but also enables the entire compression garbage truck hydraulic system to make more accurate responses based on actual operating conditions. With the help of these real-time collected data, dynamic adjustment of parameters such as output torque or displacement can be achieved by building a closed-loop control system, thereby ensuring that the best working state can be achieved under both static and dynamic working conditions.

[0044] Furthermore, considering the various complex environmental conditions that may be encountered in actual applications, such as extreme temperature changes or strong vibrations, it is possible to choose to use weather-resistant materials to manufacture pipes and related components. This not only helps to protect the components of this system from damage, but also ensures that the system still maintains good performance in harsh environments. At the same time, taking effective shock-absorbing measures during design is also an indispensable part, which can significantly reduce the impact of external interference on system stability, thereby improving the overall reliability of work.

[0045] The present invention also provides a noise reduction method, comprising the following steps: S1, set the following parameters: starting current value is H1, maximum current value is H2, starting buffer stroke is S1, middle stroke is S2, end buffer stroke is S3, starting buffer time is T1, end buffer time is T2; where S2 = total stroke - S1 - S3; S2, when the hydraulic cylinder 110 starts to extend or contract, the magnetostrictive sensor measures the initial position of the hydraulic cylinder 110, and the electro-hydraulic proportional valve 250 controls the hydraulic cylinder 110 to accelerate the extension or contraction according to the starting ramp signal determined by H1, H2, S1 and T1; S3, when the hydraulic cylinder 110 is extended or contracted to the position of the dividing point a between S1 and S2, the magnetostrictive sensor feeds back a signal to the electro-hydraulic proportional valve 250, and the electro-hydraulic proportional valve 250 adjusts the current of the electro-hydraulic proportional valve 250 to H2 after receiving the signal, and the electro-hydraulic proportional valve 250 controls the hydraulic cylinder 110 to accelerate to the first speed, and then uniformly extend or contract at the first speed; S4. When the hydraulic cylinder 110 extends or contracts to the boundary point b between S2 and S3, the magnetostrictive sensor feeds back a signal to the electro-hydraulic proportional valve 250. The electro-hydraulic proportional valve 250 controls the hydraulic cylinder 110 to decelerate and extend or contract according to the final ramp signal determined by H2, S3 and T2.

[0046] This method achieves smoother and more controllable operation of the hydraulic actuator by precisely controlling the extension or contraction process of the hydraulic cylinder 110, combining the buffer mechanism at the beginning and end stages and the uniform motion at the middle stage. This method has the following significant advantages: First, when the hydraulic cylinder 110 starts to move, the starting ramp signal determined by H1, H2, S1 and T1 is used to control the electro-hydraulic proportional valve 250, so that the hydraulic cylinder 110 can be accelerated to the required first speed in a gradual manner. This method of gradually increasing the current can effectively reduce mechanical shock and vibration, improve the stability and operation accuracy of the system. At the same time, such a starting buffer design also helps to extend the service life of the equipment because it avoids excessive stress caused by sudden startup.

[0047] Secondly, when the hydraulic cylinder 110 reaches the demarcation point a, the magnetostrictive sensor detects this change and immediately feeds back to the electro-hydraulic proportional valve 250. Based on this feedback information, the electro-hydraulic proportional valve 250 quickly adjusts its output current to the maximum value H2, causing the hydraulic cylinder 110 to enter a high-speed uniform speed operation state. In this process, thanks to the high-precision position feedback and fast response capability, the system can achieve precise control of the actuator speed and ensure that a constant speed is maintained throughout the intermediate stroke S2.

[0048] Finally, when approaching the end point, i.e., reaching the dividing point b, the system again uses the preset parameters (H2, S3, and T2) to generate the final ramp signal to control the electro-hydraulic proportional valve 250, so that the hydraulic cylinder 110 can be decelerated smoothly until it stops completely. This method not only helps to reduce the impact effect that may occur at the end stage, but also ensures accurate positioning after the action is completed.

[0049] Figure 4 The second structural schematic diagram of the electro-hydraulic proportional valve in the hydraulic system of a compression garbage truck provided by an embodiment of the present invention in the third state is illustrated.

[0050] Reference Figure 1 system Figure 4 The present invention also provides a compression garbage truck, including a compression garbage truck hydraulic system as described in any one of the above embodiments. In the compression garbage truck, the hydraulic power assembly 100 includes three hydraulic cylinders 110, and the three hydraulic cylinders 110 are used to control the scraper, the slide plate and the feeding mechanism to work in a one-to-one correspondence.

[0051] Here is how a compression garbage truck works.

[0052] Reference Figure 4When garbage needs to be loaded, the loading mechanism 500 pours the garbage into the filling bucket. When the filling bucket is full of garbage, the scraper 400 opens, and the slide plate 300 drives the scraper to move downward, and the garbage is crushed and compressed for the first time; after the scraper 400 moves into place, it rotates to further compact the garbage. After the scraper 400 rotates into place, as the slide plate 300 moves upward, the garbage is compacted and loaded into the garbage bin, and then returns to the starting position. The entire working process is controlled by the hydraulic system of the compression garbage truck. Since the magnetostrictive sensor in the hydraulic system of the compression garbage truck is controlled by the cooperation with the electro-hydraulic proportional valve, it can be controlled more accurately, and the hydraulic cylinder can be started and stopped slowly, thereby greatly improving the noise reduction effect.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic system for a compression garbage truck, characterized in that: include: At least one hydraulic power assembly (100), the hydraulic power assembly (100) comprising at least one hydraulic cylinder (110), a magnetostrictive sensor being provided inside the hydraulic cylinder (110), the magnetostrictive sensor being used to measure a telescopic position of the hydraulic cylinder (110); The electrical control component (200) comprises at least one electro-hydraulic proportional valve (250), the electro-hydraulic proportional valve (250) being connected to the hydraulic cylinder (110) in a one-to-one correspondence, the electro-hydraulic proportional valve (250) being connected to the magnetostrictive sensor signal, and the electro-hydraulic proportional valve (250) being used to control the extension and retraction speed of the hydraulic cylinder (110).

2. The hydraulic system of a compression garbage truck according to claim 1, characterized in that: The electro-hydraulic proportional valve (250) is used to switch between a first state, a second state and a third state. In the first state, the hydraulic cylinder (110) is in a stationary state; in the second state, the electro-hydraulic proportional valve (250) controls the hydraulic cylinder (110) to contract; and in the third state, the electro-hydraulic proportional valve (250) controls the hydraulic cylinder (110) to extend.

3. The hydraulic system of a compression garbage truck according to claim 2, characterized in that: The hydraulic cylinder (110) comprises a cylinder body (111), a piston (113) being slidably disposed inside the cylinder body (111), the piston (113) dividing the interior of the cylinder body (111) into a rod chamber (114) and a rodless chamber (115), and a piston rod (112) is disposed on a side of the piston (113) facing the rod chamber (114); In the second state, the oil outlet of the electro-hydraulic proportional valve (250) is in communication with the rod chamber (114), and the oil return port of the electro-hydraulic proportional valve (250) is in communication with the rodless chamber (115); In the third state, the oil outlet of the electro-hydraulic proportional valve (250) is in communication with the rodless chamber (115), and the oil return port of the electro-hydraulic proportional valve (250) is in communication with the rod chamber (114).

4. The hydraulic system for a compression garbage truck according to any one of claims 1 to 3, characterized in that: A one-way throttle valve (120) is provided between the hydraulic cylinder (110) and the electro-hydraulic proportional valve (250), and the one-way throttle valve (120) is used to control the flow of hydraulic oil between the hydraulic cylinder (110) and the electro-hydraulic proportional valve (250).

5. The hydraulic system of a compression garbage truck according to claim 4, characterized in that: A hydraulic lock (130) is provided between the one-way throttle valve (120) and the electro-hydraulic proportional valve (250), and the hydraulic lock (130) is used to lock the flow rate of hydraulic oil between the hydraulic cylinder (110) and the electro-hydraulic proportional valve (250).

6. The hydraulic system of a compression garbage truck according to claim 1, characterized in that: The electrical control assembly (200) further comprises: Fuel tank (210); An oil delivery pipe (230), the oil delivery pipe (230) comprising a main pipeline, the main pipeline being provided with a low-noise oil pump (220), one end of the main pipeline being in communication with the oil tank (210), and the other end of the main pipeline being in communication with a first branch and a second branch; the first branch being in communication with a first oil port of the electro-hydraulic proportional valve (250), and the second branch being in communication with a second oil port of the electro-hydraulic proportional valve (250); An oil return pipe (240) has one end in communication with the oil tank (210) and the other end in communication with the second oil port of the electro-hydraulic proportional valve (250).

7. The hydraulic system of a compression garbage truck according to claim 6, characterized in that: The hydraulic power assembly (100) comprises three hydraulic cylinders (110), and the three hydraulic cylinders (110) are used to control the scraper, the slide plate and the feeding mechanism to work in a one-to-one correspondence.

8. The hydraulic system of a compression garbage truck according to claim 6 or 7, characterized in that: A relief valve (260) is provided between the main pipeline and the oil return pipe (240).

9. A noise reduction method, characterized in that: include: Set the following parameters: the starting current value is H1, the maximum current value is H2, the starting buffer stroke is S1, the middle stroke is S2, the final buffer stroke is S3, the starting buffer time is T1, and the final buffer time is T2; where S2 = total stroke - S1 - S3; When the hydraulic cylinder (110) begins to extend or contract, the magnetostrictive sensor measures the initial position of the hydraulic cylinder (110), and the electro-hydraulic proportional valve (250) controls the hydraulic cylinder (110) to accelerate the extension or contraction according to a starting ramp signal determined by H1, H2, S1 and T1; When the hydraulic cylinder (110) is extended or contracted to the position of the dividing point a between S1 and S2, the magnetostrictive sensor feeds back a signal to the electro-hydraulic proportional valve (250), and after receiving the signal, the electro-hydraulic proportional valve (250) adjusts the current of the electro-hydraulic proportional valve (250) to H2, and the electro-hydraulic proportional valve (250) controls the hydraulic cylinder (110) to accelerate to a first speed, and then extend or contract at a uniform speed at the first speed; When the hydraulic cylinder (110) is extended or contracted to the position of the dividing point b between S2 and S3, the magnetostrictive sensor feeds back a signal to the electro-hydraulic proportional valve (250), and the electro-hydraulic proportional valve (250) controls the hydraulic cylinder (110) to decelerate and extend or contract according to the terminal ramp signal determined by H2, S3 and T2.

10. A compression garbage truck, characterized in that: It comprises a hydraulic system for a compression type garbage truck as described in any one of claims 1-8.

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