A new energy-saving servo hydraulic control system

Abstract

This utility model discloses a novel energy-saving servo hydraulic control system for controlling the extension and retraction of at least one hydraulic cylinder. It includes an oil tank, a hydraulic pump, and a control valve block. The inlet end of the hydraulic pump is connected to the oil tank. The control valve block includes an outlet pipeline, two branch pipelines, and a main return pipeline. The outlet pipeline is connected to the outlet end of the hydraulic pump, and the main return pipeline is connected to each of the branch pipelines via return branches. Each return branch is equipped with a balance valve. The main return pipeline also includes a cooling and filtration structure for filtering and cooling the hydraulic oil within it. This integrated cooling and filtration structure avoids the complexity of traditional systems requiring separate cooling and filtration equipment, simplifying the system structure, reducing costs and installation space, and improving the overall compactness and reliability of the system.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic systems, and in particular to a novel energy-saving servo hydraulic control system. Background Technology

[0002] In the industrial sector, hydraulic systems are widely used to control the extension and retraction of hydraulic cylinders to achieve various actions of equipment, such as construction machinery operations and injection molding machine operation.

[0003] However, a thorny problem exists in the operation of hydraulic systems: the hydraulic oil returning to the tank is too hot and contains impurities. High temperatures reduce the viscosity of the hydraulic oil, exacerbate component wear, increase leakage, and accelerate oil oxidation and deterioration, corroding components and clogging parts; impurities, on the other hand, wear down and jam hydraulic components, affecting the accuracy and reliability of the equipment.

[0004] Currently, the cooling and filtration of hydraulic oil is generally done using two separate devices. This not only requires the purchase of two additional sets of equipment, increasing procurement costs, but also requires a large installation space. For some equipment or locations with limited space, the installation and layout are very difficult, limiting its application scope. Utility Model Content

[0005] In view of the above-mentioned problems of existing hydraulic systems, this paper aims to provide a new type of energy-saving servo hydraulic control system.

[0006] The specific technical solution is as follows: A novel energy-saving servo hydraulic control system for controlling the extension and retraction of at least one hydraulic cylinder includes: an oil tank, a hydraulic pump, and a control valve block. The oil inlet of the hydraulic pump is connected to the oil tank, and the control valve block includes: An oil outlet line is connected to the oil outlet end of the hydraulic oil pump; Two branch lines are provided, one end of each branch line is connected to the oil outlet line, the other end of one branch line is connected to the rodless chamber of the hydraulic cylinder, and the other end of the other branch line is connected to the rod chamber of the hydraulic cylinder. Each branch line is equipped with a solenoid valve. The main return oil pipeline is connected to the oil tank at one end, and the main return oil pipeline is connected to each of the branch pipelines through a return oil branch. A balance valve is installed on each of the return oil branches. The main return oil pipeline is also equipped with a cooling filter structure for filtering and cooling the hydraulic oil in the main return oil pipeline.

[0007] As a further improvement and optimization of this solution, the cooling filter structure includes: The outer casing has a filter chamber inside, and the top of the outer casing has a liquid inlet communicating with the filter chamber, and the bottom has a liquid outlet communicating with the filter chamber. The outer wall of the outer casing has a cooling channel, which is arranged around the circumference of the outer casing and has a spiral structure for introducing a cooling medium. The filter screen is a cylindrical structure with an open top and is installed inside the filter chamber. The top opening of the filter screen is connected to the liquid inlet, and there is a gap between the filter screen and the inner wall of the filter chamber. The main return oil pipeline includes a first pipeline and a second pipeline. The two return oil branches are connected to the inlet through the first pipeline, and the oil tank is connected to the outlet through the second pipeline.

[0008] As a further improvement and optimization of this solution, the bottom of the filter chamber has a bucket-shaped structure.

[0009] As a further improvement and optimization of this solution, the outer shell includes: The shell is a cylindrical structure with an open top, and the inner wall of the top opening of the shell forms an internal step. The outer wall of the top of the filter screen forms a limiting edge radially, and the limiting edge cooperates with the top limiting of the internal step. A cover is detachably installed at the top opening of the outer shell and forms the filter chamber between the cover and the shell body. The liquid inlet is located on the cover and the liquid outlet is located on the shell body.

[0010] As a further improvement and optimization of this solution, the bottom of the limiting extension has multiple positioning blocks, which are circumferentially distributed, and the top of the built-in step has multiple positioning grooves, with the multiple positioning blocks respectively positioning and cooperating with the multiple positioning grooves.

[0011] As a further improvement and optimization of this solution, the cover has a bottom opening structure and is threaded onto the top outside of the shell body.

[0012] As a further improvement and optimization of this solution, a plunger portion is formed at the top inside the shell cover, and the plunger portion is sealed and fitted with the top opening of the shell body.

[0013] As a further improvement and optimization of this solution, sealing rings are provided between the outer circumferential surface of the limiting extension and the inner wall of the top opening of the shell, and between the outer circumferential surface of the plunger and the inner wall of the top opening of the shell.

[0014] As a further improvement and optimization of this solution, the outer circumferential surface of the limiting extension and the outer circumferential surface of the plunger are both provided with mounting grooves on the same axis, and the two sealing rings are respectively provided in the two mounting grooves.

[0015] As a further improvement and optimization of this solution, the hydraulic control system also includes: Mounting plate, the control valve block is mounted on the mounting plate; A servo motor is mounted on the mounting plate and is connected to the hydraulic oil pump via a drive.

[0016] The positive effects of the above technical solution compared with the existing technology are: (1) This utility model integrates a cooling and filtration structure while realizing the extension and retraction of the hydraulic cylinder. It completes the cooling and impurity filtration during the hydraulic oil return process, thereby improving the system performance and hydraulic oil quality.

[0017] (2) The integration of the cooling and filtration structure of this utility model avoids the complexity of needing to set up independent cooling and filtration equipment in traditional systems. It not only simplifies the system structure, reduces costs and installation space, but also improves the overall compactness and reliability of the system.

[0018] (3) The filter chamber inside the outer shell of this utility model provides space for the filtration and cooling of hydraulic oil. The design of the inlet and outlet ensures the smooth flow of hydraulic oil. The spiral cooling channel allows the cooling medium to fully contact the outer shell during the flow process, thereby taking away the heat transferred on the outer shell and improving the cooling efficiency. The filter screen adopts a cylindrical structure with an open top and is installed in the filter chamber. After the hydraulic oil enters from the inlet, it is first filtered by the filter screen. Impurities are trapped in the filter screen, while clean hydraulic oil flows to the outlet through the gap between the filter screen and the inner wall of the filter chamber, thus achieving effective impurity filtration. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a novel energy-saving servo hydraulic control system according to this utility model; Figure 2 This is a schematic diagram of the control valve block of a novel energy-saving servo hydraulic control system according to this utility model; Figure 3 This is a schematic diagram of the cooling and filtering structure of a novel energy-saving servo hydraulic control system according to this utility model; Figure 4 This is a cross-sectional view of the cooling and filtering structure of a novel energy-saving servo hydraulic control system according to this utility model. Figure 5 This is an exploded view of the cooling and filtering structure of a novel energy-saving servo hydraulic control system according to this utility model. In the attached diagram: 1. Mounting plate; 2. Servo motor; 3. Hydraulic oil pump; 4. Control valve block; 21. Oil outlet line; 22. Diverter line; 23. Solenoid valve; 24. Check valve; 25. Balance valve; 26. Return oil branch; 27. Cooling filter structure; 28. Main return oil line; 271. Outer shell; 272. Filter screen; 273. Sealing ring; 281. First line; 282. Second line; 2711. Shell body; 2712. Shell cover; 2713. Liquid inlet; 2714. Liquid outlet; 2715. Plunger section; 2716. Internal step; 2717. Positioning groove; 2718. Cooling channel; 2721. Limiting extension; 2722. Positioning block. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Figure 1 This is a schematic diagram of the structure of a novel energy-saving servo hydraulic control system according to this utility model; Figure 2 This is a schematic diagram of the control valve block of a novel energy-saving servo hydraulic control system according to this utility model; Figure 3 This is a schematic diagram of the cooling and filtering structure of a novel energy-saving servo hydraulic control system according to this utility model; Figure 4 This is a cross-sectional view of the cooling and filtering structure of a novel energy-saving servo hydraulic control system according to this utility model. Figure 5 This is an exploded view of the cooling and filtering structure of a novel energy-saving servo hydraulic control system according to this utility model. Figure 1-5 The diagram illustrates a novel energy-saving servo hydraulic control system according to a preferred embodiment, used to control the extension and retraction of at least one hydraulic cylinder. The system includes an oil tank, a hydraulic pump 3, and a control valve block 4. The inlet end of the hydraulic pump 3 is connected to the oil tank. The control valve block 4 includes an outlet line 21, two branch lines 22, and a main return line 28. The outlet line 21 is connected to the outlet end of the hydraulic pump 3. One end of each branch line 22 is connected to the outlet line 21, and the other end of one branch line 22 is connected to the hydraulic cylinder. The rodless chamber of the hydraulic cylinder is connected, and the other end of the other branch line 22 is connected to the rod chamber of the hydraulic cylinder. Each branch line 22 is equipped with a solenoid valve 23. One end of the main return line is connected to the oil tank, and the main return line 28 is connected to each branch line 22 through a return branch line 26. Each return branch line 26 is equipped with a balance valve 25. The main return line 28 is also equipped with a cooling filter structure 27 for filtering and cooling the hydraulic oil in the main return line 28.

[0024] This application integrates a cooling and filtration structure 27 while realizing the extension and retraction of the hydraulic cylinder. During the hydraulic oil return process, it completes the cooling and impurity filtration, thereby improving system performance and hydraulic oil quality.

[0025] The integration of the cooling and filtration structure 27 in this embodiment avoids the complexity of needing to set up separate cooling and filtration equipment in traditional systems. This not only simplifies the system structure, reduces costs and installation space, but also improves the overall compactness and reliability of the system.

[0026] Specifically, the balance valve 25 is an electric valve. Electric valves have advantages such as fast switching speed and flexible control. In the hydraulic system, the opening degree of the electric balance valve 25 can be precisely controlled by the electrical control system, thereby achieving precise regulation of the hydraulic oil flow.

[0027] More preferably, the control valve block 4 includes a housing 271, which has a first interface connected to the oil outlet of the hydraulic oil pump 3, a second interface connected to the oil tank, and two third interfaces. One third interface is connected to the rod chamber of the hydraulic cylinder, and the other third interface is connected to the rodless chamber of the hydraulic cylinder. The oil outlet pipe 21, the two branch pipes 22, and the main return pipe 28 are all located inside the housing 271. The oil outlet pipe 21 is connected to the first interface, the two branch pipes 22 are connected to the two third interfaces respectively, and the main return pipe 28 is connected to the second interface.

[0028] Even better, each branch pipe 22 is equipped with a one-way valve 24.

[0029] Furthermore, as a preferred embodiment, the cooling filter structure includes a housing and a filter screen 272. A filter chamber is formed inside the housing, and the top of the housing has a liquid inlet 2713 communicating with the filter chamber, and the bottom has a liquid outlet 2714 communicating with the filter chamber. A cooling channel 2718 is provided inside the outer wall of the housing. The cooling channel 2718 is arranged around the circumference of the housing and has a spiral structure for introducing cooling medium. The filter screen 272 is a cylindrical structure with an open top and is installed inside the filter chamber. The top opening of the filter screen 272 communicates with the liquid inlet 2713, and there is a gap between the filter screen 272 and the inner wall of the filter chamber. The main return oil pipeline includes a first pipeline 281 and a second pipeline 282. Two return oil branches 26 are connected to the liquid inlet 2713 through the first pipeline 281, and the oil tank is connected to the liquid outlet 2714 through the second pipeline 282.

[0030] Specifically, the internal filter chamber provides space for the filtration and cooling of hydraulic oil. The design of the inlet 2713 and outlet 2714 ensures the smooth flow of hydraulic oil. The spiral cooling channel 2718 allows the cooling medium to fully contact the outer casing during flow, thereby carrying away the heat transferred from the outer casing and improving cooling efficiency. The filter screen 272 adopts a top-opening cylindrical structure and is installed in the filter chamber. After the hydraulic oil enters from the inlet 2713, it is first filtered by the filter screen 272. Impurities are trapped in the filter screen 272, while the clean hydraulic oil flows to the outlet 2714 through the gap between the filter screen 272 and the inner wall of the filter chamber, thus achieving effective impurity filtration.

[0031] Specifically, a cooling water tank is installed outside the system. The cooling water tank supplies cooling water to one end of the cooling channel 2718 through a pipeline via a circulating water pump. The water from the other end of the cooling channel 2718 then flows back to the cooling water tank through another pipeline.

[0032] Furthermore, as a preferred embodiment, the bottom of the filter chamber has a bucket-shaped structure. This reduces the impact of hydraulic oil on the bottom of the filter chamber and minimizes vibrations caused by the flow of hydraulic oil.

[0033] Furthermore, in a preferred embodiment, the outer casing 271 includes a casing body 2711 and a casing cover 2712. The casing body 2711 is a cylindrical structure with a top opening, and the inner wall of the top opening of the casing body 2711 forms an internal step 2716. The top outer wall of the filter screen 272 has a radially forming limiting extension 2721, which cooperates with the top limiting of the internal step 2716. The casing cover 2712 is detachably installed at the top opening of the outer casing 271, forming a filtration chamber between it and the casing body 2711. The liquid inlet 2713 is provided on the casing cover 2712, and the liquid outlet 2714 is provided on the casing body 2711. The casing body 2711 and the casing cover 2712 are detachably connected. When it is necessary to replace or clean the filter screen 272, the filter screen 272 can be easily removed by simply opening the casing cover 2712, making the operation convenient and quick. The built-in step 2716 and limiting extension 2721 ensure that the filter screen 272 is accurately positioned during installation, preventing displacement of the filter screen 272 during hydraulic oil flow and guaranteeing the filtration effect. Furthermore, in a preferred embodiment, the bottom of the limiting edge 2721 has multiple positioning blocks 2722, which are circumferentially distributed. The top of the built-in step 2716 has multiple positioning grooves 2717, and the multiple positioning blocks 2722 are respectively positioned and engaged with the multiple positioning grooves 2717. The multiple positioning blocks 2722 are circumferentially distributed at the bottom of the limiting edge 2721, corresponding to the multiple positioning grooves 2717 at the top of the built-in step 2716. When the filter screen 272 is installed, the positioning blocks 2722 can be accurately inserted into the positioning grooves 2717, ensuring the fixed position of the filter screen 272. This not only improves the accuracy of the filter screen 272 installation but also enhances the stability of the filter screen 272 during hydraulic oil flow, avoiding problems such as decreased filtration effect and equipment damage caused by the shaking of the filter screen 272.

[0034] Furthermore, as a preferred embodiment, the cover 2712 has a bottom-opening structure and is threaded onto the top exterior of the housing 2711. The threaded connection is simple and reliable, facilitating the installation and removal of the cover 2712 while ensuring the sealing of the interior of the housing 271.

[0035] Furthermore, as a preferred embodiment, a plunger portion 2715 is formed at the top inside the cover 2712, and the plunger portion 2715 seals against the top opening of the housing 2711. The plunger portion 2715 inside the cover 2712 is designed to further improve the sealing effect of the housing 271. When the cover 2712 is installed on the housing 2711, the plunger portion 2715 can tightly seal the top opening of the housing 2711, forming a closed space and effectively preventing hydraulic oil from leaking out from the connection between the cover 2712 and the housing 2711. This design increases the safety and reliability of the system and reduces environmental pollution and equipment damage caused by hydraulic oil leakage.

[0036] Furthermore, as a preferred embodiment, sealing rings 273 are provided between the outer circumferential surface of the limiting extension 2721 and the inner wall of the top opening of the housing 2711, and between the outer circumferential surface of the plunger portion 2715 and the inner wall of the top opening of the housing 2711. The placement of sealing rings 273 between the outer circumferential surface of the limiting extension 2721 and the inner wall of the top opening of the housing 2711, and between the outer circumferential surface of the plunger portion 2715 and the inner wall of the top opening of the housing 2711, forms multiple lines of sealing, effectively preventing hydraulic oil leakage. The sealing rings 273 possess good elasticity and sealing performance, maintaining a sealed state under certain pressure, while also adapting to minor deformations between the components of the housing 271, ensuring the long-term stability of the sealing effect.

[0037] Furthermore, in a preferred embodiment, both the outer circumferential surface of the limiting extension 2721 and the outer circumferential surface of the plunger portion 2715 are coaxially provided with mounting grooves, and the two sealing rings 273 are respectively disposed in the two mounting grooves. The coaxial provision of mounting grooves on the outer circumferential surfaces of the limiting extension 2721 and the plunger portion 2715 provides an accurate installation position for the sealing rings 273. The mounting grooves can restrict the movement of the sealing rings 273, ensuring they maintain a stable position during installation and use.

[0038] Furthermore, as a preferred embodiment, the hydraulic control system also includes a mounting plate 1 and a servo motor 2. The control valve block 4 is mounted on the mounting plate 1, and the servo motor 2 is mounted on the mounting plate 1 and is connected to the hydraulic oil pump 3 for transmission.

[0039] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A new energy-saving servo hydraulic control system for controlling the extension and retraction of at least one hydraulic cylinder, characterized in that, include: An oil tank, a hydraulic oil pump, and a control valve block are provided, wherein the oil inlet of the hydraulic oil pump is connected to the oil tank, and the control valve block includes: An oil outlet line is connected to the oil outlet end of the hydraulic oil pump; Two branch lines are provided, one end of each branch line is connected to the oil outlet line, the other end of one branch line is connected to the rodless chamber of the hydraulic cylinder, and the other end of the other branch line is connected to the rod chamber of the hydraulic cylinder. Each branch line is equipped with a solenoid valve. The main return oil pipeline is connected to the oil tank at one end, and the main return oil pipeline is connected to each of the branch pipelines through a return oil branch. A balance valve is installed on each of the return oil branches. The main return oil pipeline is also equipped with a cooling filter structure for filtering and cooling the hydraulic oil in the main return oil pipeline.

2. The novel energy saving servo hydraulic control system as claimed in claim 1, wherein, The cooling filtration structure includes: The outer casing has a filter chamber inside, and the top of the outer casing has a liquid inlet communicating with the filter chamber, and the bottom has a liquid outlet communicating with the filter chamber. The outer wall of the outer casing has a cooling channel, which is arranged around the circumference of the outer casing and has a spiral structure for introducing a cooling medium. The filter screen is a cylindrical structure with an open top and is installed inside the filter chamber. The top opening of the filter screen is connected to the liquid inlet, and there is a gap between the filter screen and the inner wall of the filter chamber. The main return oil pipeline includes a first pipeline and a second pipeline. The two return oil branches are connected to the inlet through the first pipeline, and the oil tank is connected to the outlet through the second pipeline.

3. The novel energy saving servo hydraulic control system as claimed in claim 2, wherein, The bottom of the filter chamber has a bucket-shaped structure.

4. The new energy saving servo hydraulic control system of claim 2, wherein, The outer casing includes: The shell is a cylindrical structure with an open top, and the inner wall of the top opening of the shell forms an internal step. The outer wall of the top of the filter screen forms a limiting edge radially, and the limiting edge cooperates with the top limiting of the internal step. A cover is detachably installed at the top opening of the outer shell and forms the filter chamber between the cover and the shell body. The liquid inlet is located on the cover and the liquid outlet is located on the shell body.

5. The novel energy saving servo hydraulic control system as claimed in claim 4, wherein, The bottom of the limiting extension has multiple positioning blocks, which are circumferentially distributed. The top of the built-in step has multiple positioning grooves, and the multiple positioning blocks are respectively positioned and engaged with the multiple positioning grooves.

6. The new energy saving servo hydraulic control system of claim 4, wherein, The cover has a bottom opening structure and is threaded onto the top outside of the shell body.

7. The novel energy saving servo hydraulic control system as claimed in claim 6, wherein, A plunger portion is formed at the top inside the shell cover, and the plunger portion is sealed and engaged with the top opening of the shell body.

8. The novel energy saving servo hydraulic control system, according to claim 7, wherein, A sealing ring is provided between the outer circumferential surface of the limiting extension and the inner wall of the top opening of the shell, and between the outer circumferential surface of the plunger and the inner wall of the top opening of the shell.

9. The novel energy saving servo-hydraulic control system, according to claim 8, wherein, The outer circumferential surface of the limiting extension and the outer circumferential surface of the plunger are both provided with mounting grooves on the same axis, and the two sealing rings are respectively provided in the two mounting grooves.

10. The novel energy saving servo-hydraulic control system, according to claim 1, wherein, The hydraulic control system also includes: Mounting plate, the control valve block is mounted on the mounting plate; A servo motor is mounted on the mounting plate and is connected to the hydraulic oil pump via a drive.

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