Papermaking equipment and hydraulic system thereof

Abstract

The utility model provides papermaking equipment and a hydraulic system thereof. The hydraulic system comprises an oil tank, an oil conveying pipeline, a circulating device and a cooler, hydraulic oil is contained in the oil tank, the two ends of the oil conveying pipeline are inserted into the oil tank respectively, the circulating device is connected with the position, close to the oil inlet end, of the oil conveying pipeline and used for pumping the hydraulic oil in the oil tank to the oil conveying pipeline for circulation, and the cooler is arranged on the oil conveying pipeline. The cooling device is used for cooling hydraulic oil circularly flowing in the oil conveying pipeline. According to the hydraulic system provided by the embodiment of the invention, by designing the circulating oil way for cooling the hydraulic oil, the temperature of the hydraulic oil can be controlled, and the stability of the hydraulic system is improved.

Description

Technical Field

[0001] This application relates to the technical field of hydraulic control, and specifically relates to a papermaking device and its hydraulic system. Background Art

[0002] In the hydraulic system of the conventional technical solution, the temperature of the hydraulic oil is uncontrollable, and the situation where the hydraulic system fails due to too high or too low oil temperature occurs frequently. Summary of the Invention

[0003] In the first aspect of the embodiments of this application, a hydraulic system is provided. The hydraulic system includes: an oil tank, an oil pipeline, a circulation device, and a cooler; hydraulic oil is contained in the oil tank, both ends of the oil pipeline are inserted into the oil tank respectively, the circulation device is connected to the oil pipeline near the oil inlet end for pumping the hydraulic oil in the oil tank into the oil pipeline for circulation, and the cooler is arranged on the oil pipeline for cooling the hydraulic oil circulating in the oil pipeline.

[0004] In some embodiments, the hydraulic system further includes a hydraulic control check valve, and the hydraulic control check valve is connected in series to the oil pipeline and is located between the cooler and the circulation device.

[0005] In some embodiments, the hydraulic system further includes a protection check valve, and the protection check valve is connected in parallel with the cooler.

[0006] In some embodiments, the hydraulic system further includes a first oil filter, and the first oil filter is connected in series to the oil pipeline for filtering the hydraulic oil circulating in the oil pipeline; the first oil filter is connected in series between the cooler and the oil tank.

[0007] In some embodiments, the hydraulic system further includes a second oil filter, and the second oil filter is arranged in parallel with the first oil filter.

[0008] In some embodiments, the second oil filter and the first oil filter are connected by a communication valve.

[0009] In some embodiments, the second oil filter is communicated with the oil return pipeline of the hydraulic system for filtering the hydraulic oil flowing through the oil return pipeline.

[0010] In some embodiments, the hydraulic system further includes a pressure gauge, and the pressure gauge is connected to the oil pipeline for detecting the pressure at the position of the oil pipeline between the cooler and the circulation device.

[0011] In some embodiments, the hydraulic system further includes a heater, which is connected to the fuel tank and used to heat the fuel tank.

[0012] In a second aspect, an embodiment of the present application provides a papermaking device, which includes the hydraulic system described in the above embodiments.

[0013] The hydraulic system provided by the embodiment of the present application can realize the temperature control of the hydraulic oil and improve the stability of the hydraulic system by designing a circulating oil circuit for cooling the hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 is a schematic structural diagram of an embodiment of the hydraulic system of the present application;

[0016] Figure 2 is a schematic structural diagram of another embodiment of the hydraulic system of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will further describe the present application in detail in combination with the drawings and embodiments. It should be specifically pointed out that the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only some embodiments of the present application rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0018] The terms "first", "second", and "third" in the embodiments of the present application are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", and "third" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and explicitly defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly. The terms "include" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or components inherent to these processes, methods, products, or devices.

[0019] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0020] Please refer to Figure 1 , Figure 1 is a schematic structural diagram of an embodiment of the hydraulic system of the present application. The hydraulic system 10 in this embodiment can be used in papermaking equipment such as a paper rewinder and a paper press. Among them, the hydraulic system 10 includes but is not limited to the following structural components: an oil tank 100, an oil pipeline 200, a circulation device 300, and a cooler 400.

[0021] Specifically, the oil tank 100 contains hydraulic oil. The two ends of the oil pipeline 200 are respectively inserted into the oil tank 100. The circulation device 300 is connected to the oil pipeline 200 near the inlet end and is used to pump the hydraulic oil in the oil tank 100 into the oil pipeline 200 for circulation. Among them, the circulation device 300 in this embodiment may include a circulation pump 310 and a circulation pump motor 320. The circulation pump motor 320 is used to drive the circulation pump 310 to rotate to achieve pumping of oil.

[0022] Among them, the cooler 400 is arranged on the oil pipeline 200 and is used to cool the hydraulic oil circulating in the oil pipeline 200.

[0023] Optionally, please continue to refer toFigure 1 , in the hydraulic system 10 of this embodiment, a pilot-operated check valve 500 and a protection check valve 600 are further included. The pilot-operated check valve 500 is connected in series to the oil pipeline 200 and is located between the cooler 400 and the circulation device 300; the protection check valve 600 is connected in parallel with the cooler 400, and the protection check valve 600 can solve the problem that the hydraulic oil in the oil pipeline 200 cannot circulate after the cooler 400 is blocked.

[0024] The hydraulic system provided in this embodiment can achieve temperature control of the hydraulic oil by designing a circulating oil circuit for cooling the hydraulic oil. By circulating, the problem of overheating of the oil product is effectively solved (the oil temperature can be controlled between 45 - 50 degrees Celsius), thereby improving the stability of the hydraulic system.

[0025] Optionally, please continue to refer to Figure 1 , in the hydraulic system 10 of this embodiment, a first oil filter 700 is further included. The first oil filter 700 is connected in series to the oil pipeline 200 and is used to filter the hydraulic oil circulating in the oil pipeline 200. Among them, the first oil filter 700 is connected in series between the cooler 400 and the fuel tank 100. In the hydraulic system of this embodiment, by setting the first oil filter, the hydraulic oil circulating in the oil pipeline can be filtered, a circulating filter is provided to filter impurities, ensuring the cleanliness of the oil product in the fuel tank, and effectively solving the problem of solenoid valve blockage of the valve group due to impurities in the oil product.

[0026] Optionally, please continue to refer to Figure 1 , in the hydraulic system 10 of this embodiment, a pressure gauge 800 is further included. The pressure gauge 800 is connected to the oil pipeline 200 and is used to detect the pressure at the position of the oil pipeline 200 between the cooler 400 and the circulation device 300. Among them, the pressure gauge 800 and the oil pipeline 200 can be connected through a hand valve 801.

[0027] Please refer to Figure 2 , Figure 2 is a schematic structural diagram of another embodiment of the hydraulic system of this application. The hydraulic system 10 in this embodiment includes, but is not limited to, the following structural components: a fuel tank 100, an oil pipeline 200, a circulation device 300, and a cooler 400.

[0028] Specifically, the fuel tank 100 is filled with hydraulic oil. Both ends of the oil pipeline 200 are inserted into the fuel tank 100 respectively. The circulation device 300 is connected to the oil pipeline 200 near the inlet end and is used to pump the hydraulic oil in the fuel tank 100 into the oil pipeline 200 for circulation. Among them, the circulation device 300 in this embodiment may include a circulation pump 310 and a circulation pump motor 320. The circulation pump motor 320 is used to drive the circulation pump 310 to rotate to achieve oil pumping. The cooler 400 is arranged on the oil pipeline 200 and is used to cool the hydraulic oil circulating in the oil pipeline 200. The double-headed arrow at the position of the cooler 400 in the figure indicates the inflow and outflow of cooling water. Among them, a switch valve 401 may be provided on the inflow pipeline of the cooling water.

[0029] Optionally, please continue to refer to Figure 2 , the hydraulic system 10 in this embodiment further includes a pilot-operated check valve 500 and a protection check valve 600. The pilot-operated check valve 500 is connected in series to the oil pipeline 200 and is located between the cooler 400 and the circulation device 300; the protection check valve 600 is connected in parallel with the cooler 400. The protection check valve 600 can solve the problem that the hydraulic oil in the oil pipeline 200 cannot circulate after the cooler 400 is blocked.

[0030] The hydraulic system provided in this embodiment can realize the temperature control of the hydraulic oil by designing a circulating oil circuit for cooling the hydraulic oil, and effectively solve the problem of overheating of the oil product (the oil temperature can be controlled between 45-50 degrees Celsius) through circulation, thereby improving the stability of the hydraulic system.

[0031] Optionally, please continue to refer to Figure 2 , the hydraulic system 10 in this embodiment further includes a first oil filter 700. The first oil filter 700 is connected in series to the oil pipeline 200 and is used to filter the hydraulic oil circulating in the oil pipeline 200. Among them, the first oil filter 700 is connected in series between the cooler 400 and the fuel tank 100. In the hydraulic system of this embodiment, by setting the first oil filter, the hydraulic oil circulating in the oil pipeline can be filtered, and a circulating filter is provided to filter impurities, ensuring the cleanliness of the oil product in the fuel tank and effectively solving the problem of the valve group solenoid valve being blocked due to impurities in the oil product.

[0032] In the hydraulic system of the embodiment of the present application, by setting a dedicated cooler 400, the problem of poor temperature controllability can be solved. According to the oil product and control characteristics, the pump stops at low temperature and starts at high temperature, which can solve the problem of waste of electric energy. The dedicated filter (the first oil filter 700) can realize the function of filtering the oil product in the fuel tank.

[0033] Optionally, please continue to refer to Figure 2, the hydraulic system 10 in this embodiment further includes a pressure gauge 800, which is connected to the oil pipeline 200 and is used to detect the pressure at the position of the oil pipeline 200 between the cooler 400 and the circulation device 300. Among them, the pressure gauge 800 and the oil pipeline 200 can be connected through a manual valve 801.

[0034] Different from the foregoing embodiment, the hydraulic system in this embodiment further includes a second oil filter 900, which is arranged in parallel with the first oil filter 700. Among them, the second oil filter 900 and the first oil filter 700 can be connected through a communication valve 709, and the communication valve 709 can be a manual valve or an electric control valve. The second oil filter 900 is communicated with the oil return pipeline 210 (the position marked T in the figure) of the hydraulic system and is used to filter the hydraulic oil flowing through the oil return pipeline 210. In addition, by arranging a communication valve 709 between the oil return pipeline 210 and the oil pipeline 200, the second oil filter 900 and the first oil filter 700 are backed up with each other, and the effect of parallel use of the two filters can be achieved, reducing the failure rate.

[0035] The process of hydraulic oil circulation is as follows: The circulation pump motor 320 starts, drives the circulation pump 310 to rotate, the hydraulic oil flows out through the circulation pump 310, enters the cooler 400 after passing through the hydraulic control check valve 500, and the hydraulic oil flows into the first oil filter 700 (the filter is provided with a blockage alarm, and when the pressure difference between the input port pressure and the output port pressure > 3.5 bar, an alarm is output to remind the maintenance personnel that the filter element needs to be replaced) after being cooled by the cooler 400, and the hydraulic oil flows into the fuel tank 100 through the outlet of the first oil filter 700. If the first oil filter 700 has problems such as blockage, the communication valve 709 can be opened to use the second oil filter 900 for filtration.

[0036] Please continue to refer to Figure 2 , the hydraulic system 10 in this embodiment further includes a heater 101 and an oil drain valve 102. The heater 101 is connected to the fuel tank 100 and is used to heat the fuel tank 100. The heater 101 cooperates with the cooler 400 to keep the oil temperature within a predetermined range under any temperature conditions (cold and high temperature) of the hydraulic system.

[0037] Among them, the number of heaters 101 can be multiple, which are attached to the surface of the fuel tank 100 or arranged in the hydraulic oil inside the fuel tank 100. The oil drain valve 102 is arranged at the bottom position of the fuel tank 100 and is used to drain the hydraulic oil in the fuel tank 100.

[0038] The hydraulic system provided by the embodiment of the present application can realize the temperature control and filtration of hydraulic oil by designing a circulating oil circuit for hydraulic oil cooling, improving the stability and reliability of the hydraulic system.

[0039] The above are only some embodiments of the present application, and thus do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A hydraulic system, characterized in that: The hydraulic system includes: an oil tank, an oil pipeline, a circulation device and a cooler; the oil tank contains hydraulic oil, both ends of the oil pipeline are respectively inserted into the oil tank, the circulation device is connected to the oil pipeline near the oil inlet end, and is used to pump the hydraulic oil in the oil tank to the oil pipeline for circulation, and the cooler is arranged on the oil pipeline, and is used to cool the hydraulic oil circulating in the oil pipeline.

2. The hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a hydraulically controlled one-way valve, which is connected in series to the oil delivery pipeline and is located between the cooler and the circulation device.

3. The hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a protection check valve, and the protection check valve is connected in parallel with the cooler.

4. The hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a first oil filter, which is serially connected to the oil pipeline and is used for filtering the hydraulic oil circulating in the oil pipeline; the first oil filter is serially connected between the cooler and the oil tank.

5. The hydraulic system according to claim 4, characterized in that: The hydraulic system further includes a second oil filter, which is arranged in parallel with the first oil filter.

6. The hydraulic system according to claim 5, characterized in that: The second oil filter is connected to the first oil filter via a communication valve.

7. The hydraulic system according to claim 5, characterized in that: The second oil filter is in communication with the oil return pipeline of the hydraulic system and is used for filtering the hydraulic oil flowing through the oil return pipeline.

8. The hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises a pressure detection gauge, which is connected to the oil pipeline and is used to detect the pressure of the oil pipeline at a position between the cooler and the circulation device.

9. The hydraulic system according to claim 8, characterized in that: The hydraulic system further comprises a heater, which is connected to the oil tank and is used for heating the oil tank.

10. A papermaking device, characterized in that: The papermaking equipment comprises the hydraulic system according to any one of claims 1-9.

Images