Papermaking rewinding machine and hydraulic system thereof

Abstract

The utility model provides a papermaking rewinding machine and a hydraulic system thereof. The hydraulic system comprises an oil tank, a first oil pumping assembly and a second oil pumping assembly. The first oil pumping assembly comprises a first oil pumping device and a first one-way valve which are connected in series, and the first oil pumping assembly is used for driving the first hydraulic mechanism; the second oil pumping assembly comprises a second oil pumping device and a second one-way valve which are connected in series, the oil inlet end of the second oil pumping device is connected with the oil tank, the oil outlet end of the second oil pumping device is connected with the second one-way valve, and the second oil pumping assembly is used for driving the second hydraulic mechanism. The hydraulic system can provide synchronous or asynchronous hydraulic driving control for different hydraulic mechanisms by designing a double-pump double-output hydraulic control mode, has the characteristics of high control precision and stability, and can prevent the pressure fluctuation of the hydraulic system caused by the action of the hydraulic mechanisms from influencing the pressure fluctuation of the system, so that the service life of the system is prolonged. And the problems that the control is unstable and the paper quality is influenced are solved.

Description

Technical Field

[0001] The present application relates to the technical field of papermaking equipment, and in particular to a papermaking rewinder and a hydraulic system thereof. Background Art

[0002] Conventional paper rewinders are usually supplied with oil by a single pump. The rewinder has many hydraulic mechanisms, including synchronous mechanisms. When the hydraulic mechanism is activated, it will cause system pressure fluctuations, affecting the precise control of the proportional valve output, causing unstable linear pressure control of the paper pressing roller, and affecting the product quality of the rolled paper after the rewinder. Utility Model Content

[0003] A first aspect of an embodiment of the present application provides a hydraulic system, which includes: an oil tank, a first oil pumping assembly and a second oil pumping assembly; the first oil pumping assembly includes a first oil pumping device and a first one-way valve connected in series, the oil inlet end of the first oil pumping device is connected to the oil tank, the oil outlet end of the first oil pumping device is connected to the first one-way valve, and the first oil pumping assembly is used to drive a first hydraulic mechanism; the second oil pumping assembly includes a second oil pumping device and a second one-way valve connected in series, the oil inlet end of the second oil pumping device is connected to the oil tank, the oil outlet end of the second oil pumping device is connected to the second one-way valve, and the second oil pumping assembly is used to drive a second hydraulic mechanism.

[0004] In some embodiments, the first oil pumping device includes a first oil pump and a first motor, the first motor is used to drive the first oil pump to pump oil from the oil tank; the second oil pumping device includes a second oil pump and a second motor, the second motor is used to drive the second oil pump to pump oil from the oil tank.

[0005] In some embodiments, the first oil pump assembly further includes a first stop valve, which is connected in series between the first oil pump and the oil tank; the second oil pump assembly further includes a second stop valve, which is connected in series between the second oil pump and the oil tank.

[0006] In some embodiments, the first oil pump assembly also includes a first oil filter, which is connected in series between the first one-way valve and the first hydraulic mechanism; the second oil pump assembly also includes a second oil filter, which is connected in series between the second one-way valve and the second hydraulic mechanism.

[0007] In some embodiments, the first oil pump assembly also includes a first overflow valve, one end of which is connected to the hydraulic oil pipeline between the first oil filter and the first hydraulic mechanism, and the other end is connected to the oil tank; the second oil pump assembly also includes a second overflow valve, one end of which is connected to the hydraulic oil pipeline between the second oil filter and the second hydraulic mechanism, and the other end is connected to the oil tank.

[0008] In some embodiments, the first oil pump assembly also includes a first pressure sensor, which is used to detect the pressure in the hydraulic oil pipeline between the first overflow valve and the first hydraulic mechanism; the second oil pump assembly also includes a second pressure sensor, which is used to detect the pressure in the hydraulic oil pipeline between the second overflow valve and the second hydraulic mechanism.

[0009] In some embodiments, the first oil pump assembly also includes a first pointer pressure gauge, which is used to detect and display the hydraulic pressure at the position of the first pressure sensor; the second oil pump assembly also includes a second pointer pressure gauge, which is used to detect and display the hydraulic pressure at the position of the second pressure sensor.

[0010] In some embodiments, the hydraulic system also includes a connecting valve, which is used to connect the pressure oil output ends of the first oil pump assembly and the second oil pump assembly, so that the output circuits of the first oil pump assembly and the second oil pump assembly can achieve a backup relationship with each other.

[0011] In some embodiments, the hydraulic system further includes an air filter, a fuel tank oil mark, a liquid level sensor, and a temperature sensor, and the air filter, the fuel tank oil mark, the liquid level sensor, and the temperature sensor are respectively connected to the fuel tank.

[0012] In the second aspect, an embodiment of the present application provides a papermaking rewinding machine, which includes a first hydraulic mechanism, a second hydraulic mechanism and the hydraulic system described in the above embodiments, wherein the first oil pump component of the hydraulic system is connected to the first hydraulic mechanism and is used to drive the first hydraulic mechanism, and the second oil pump component of the hydraulic system is connected to the second hydraulic mechanism and is used to drive the second hydraulic mechanism, wherein the first hydraulic mechanism is a paper pressing roller.

[0013] The hydraulic system provided in the embodiment of the present application can provide synchronous or asynchronous hydraulic drive control for different hydraulic mechanisms by designing a dual-pump dual-output hydraulic control method. It has the characteristics of high control accuracy and stability, and can prevent paper quality problems caused by unstable control of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 This is a schematic diagram of the structure of a hydraulic control system of an embodiment of a papermaking rewinder of the present application;

[0016] Figure 2 It is a schematic diagram of the structure of a hydraulic control system of another embodiment of the papermaking rewinder of the present application. DETAILED DESCRIPTION

[0017] The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by ordinary technicians in the field without making creative work are 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 understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", and "third" can expressly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of the present application and any of their variations are intended to cover non-exclusive inclusions. 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 also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products, or devices.

[0019] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of a hydraulic control system of an embodiment of a paper rewinding machine of the present application, and the paper rewinding machine includes but is not limited to: a first hydraulic mechanism 10, a second hydraulic mechanism 20 and a hydraulic system 30. Among them, the paper rewinding machine in the embodiment of the present application only shows features related to the hydraulic system, and other features of the paper rewinding machine are within the scope of understanding of those skilled in the art and will not be described in detail here.

[0021] Specifically, the hydraulic system 30 in this embodiment includes: an oil tank 300, a first oil pumping assembly 100 and a second oil pumping assembly 200; wherein, the oil tank 300 is used to contain hydraulic oil, and the first oil pumping assembly 100 includes a first oil pumping device 110 and a first one-way valve 120 connected in series, the oil inlet end of the first oil pumping device 110 is connected to the oil tank 300, and the oil outlet end of the first oil pumping device 110 is connected to the first one-way valve 120, and the first oil pumping assembly 100 is used to output hydraulic pressure P1 to the first hydraulic mechanism 10 and drive the first hydraulic mechanism 10.

[0022] Optionally, the first oil pumping device 110 in this embodiment includes a first oil pump 111 and a first motor 112 , and the first motor 112 is used to drive the first oil pump 111 to pump oil from the oil tank 300 .

[0023] Optionally, the second oil pumping assembly 200 includes a second oil pumping device 210 and a second one-way valve 220 connected in series, the oil inlet end of the second oil pumping device 210 is connected to the oil tank 300, and the oil outlet end of the second oil pumping device 210 is connected to the second one-way valve 220. The second oil pumping assembly 200 is used to output hydraulic pressure P2 to the second hydraulic mechanism 20 and drive the second hydraulic mechanism 20. The second oil pumping device 210 includes a second oil pump 211 and a second motor 212. The second motor 212 is used to drive the second oil pump 211 to pump oil from the oil tank 300.

[0024] Among them, the first hydraulic mechanism 10 in the embodiment of the present application can be a paper pressing roller of a papermaking rewinder, and the second hydraulic mechanism 20 can be a hydraulic mechanism that moves asynchronously with the paper pressing roller, such as a lifting mechanism, or a hydraulic mechanism that moves synchronously with the paper pressing roller, which is not specifically limited here.

[0025] Optionally, the first oil pump assembly 100 in the embodiment of the present application also includes a first stop valve 130, which is connected in series between the first oil pump 111 and the oil tank 300; the second oil pump assembly 200 also includes a second stop valve 230, which is connected in series between the second oil pump 211 and the oil tank 300.

[0026] Optionally, the first oil pump assembly 100 also includes a first overflow valve 140, and both ends of the first overflow valve 140 are respectively connected between the oil tank 300 and the pressure oil output end of the first oil pump assembly 100; the second oil pump assembly 200 also includes a second overflow valve 240, and both ends of the second overflow valve 240 are respectively connected between the oil tank 300 and the pressure oil output end of the second oil pump assembly 200.

[0027] Optionally, the first oil pump assembly 100 in the embodiment of the present application also includes a first pointer pressure gauge 150, which is used to detect the hydraulic pressure of the first overflow valve 140; the second oil pump assembly 200 also includes a second pointer pressure gauge 250, which is used to detect the hydraulic pressure of the second overflow valve 240.

[0028] The hydraulic system provided in the embodiment of the present application can provide synchronous or asynchronous hydraulic drive control for different hydraulic mechanisms by designing a dual-pump dual-output hydraulic control method. It has the characteristics of high control accuracy and stability, and can prevent paper quality problems caused by unstable control of the hydraulic system.

[0029] See also Figure 2 , Figure 2 It is a schematic diagram of the structure of a hydraulic control system of another embodiment of the papermaking rewinder of the present application. The papermaking rewinder includes but is not limited to: a first hydraulic mechanism 10, a second hydraulic mechanism 20 and a hydraulic system 30.

[0030] Specifically, the hydraulic system 30 in this embodiment includes: an oil tank 300, a first oil pumping assembly 100 and a second oil pumping assembly 200; wherein, the oil tank 300 is used to contain hydraulic oil, and the first oil pumping assembly 100 includes a first oil pumping device 110 and a first one-way valve 120 connected in series, the oil inlet end of the first oil pumping device 110 is connected to the oil tank 300, and the oil outlet end of the first oil pumping device 110 is connected to the first one-way valve 120, and the first oil pumping assembly 100 is used to output hydraulic pressure P1 to the first hydraulic mechanism 10 and drive the first hydraulic mechanism 10.

[0031] Optionally, the first oil pumping device 110 in this embodiment includes a first oil pump 111 and a first motor 112 , and the first motor 112 is used to drive the first oil pump 111 to pump oil from the oil tank 300 .

[0032] Optionally, the second oil pumping assembly 200 includes a second oil pumping device 210 and a second one-way valve 220 connected in series, the oil inlet end of the second oil pumping device 210 is connected to the oil tank 300, and the oil outlet end of the second oil pumping device 210 is connected to the second one-way valve 220. The second oil pumping assembly 200 is used to output hydraulic pressure P2 to the second hydraulic mechanism 20 and drive the second hydraulic mechanism 20. The second oil pumping device 210 includes a second oil pump 211 and a second motor 212. The second motor 212 is used to drive the second oil pump 211 to pump oil from the oil tank 300.

[0033] Among them, the first hydraulic mechanism 10 in the embodiment of the present application can be a paper pressing roller of a papermaking rewinder, and the second hydraulic mechanism 20 can be a hydraulic mechanism that moves asynchronously with the paper pressing roller, such as a lifting mechanism, or a hydraulic mechanism that moves synchronously with the paper pressing roller, which is not specifically limited here.

[0034] Optionally, the first oil pump assembly 100 in the embodiment of the present application also includes a first stop valve 130, which is connected in series between the first oil pump 111 and the oil tank 300; the second oil pump assembly 200 also includes a second stop valve 230, which is connected in series between the second oil pump 211 and the oil tank 300.

[0035] Optionally, the first oil pump assembly 100 in the embodiment of the present application also includes a first oil filter 160, which is connected in series between the first one-way valve 120 and the first hydraulic mechanism 10; the second oil pump assembly 200 also includes a second oil filter 260, which is connected in series between the second one-way valve 220 and the second hydraulic mechanism 20.

[0036] Optionally, the first oil pump assembly 100 in the embodiment of the present application also includes a first overflow valve 140, one end of the first overflow valve 140 is connected to the hydraulic oil pipeline between the first oil filter 160 and the first hydraulic mechanism 10, and the other end is connected to the oil tank 300; the second oil pump assembly 200 also includes a second overflow valve 240, one end of the second overflow valve 240 is connected to the hydraulic oil pipeline between the second oil filter 260 and the second hydraulic mechanism 20, and the other end is connected to the oil tank 300.

[0037] Optionally, the first oil pump assembly 100 in the embodiment of the present application also includes a first pressure sensor 170, which is used to detect the pressure in the hydraulic oil pipeline between the first overflow valve 140 and the first hydraulic mechanism 10, and transmit the detected pressure signal to the control main board (such as PLC); the second oil pump assembly 200 also includes a second pressure sensor 270, which is used to detect the pressure in the hydraulic oil pipeline between the second overflow valve 240 and the second hydraulic mechanism 20, and transmit the detected pressure signal to the control main board (such as PLC).

[0038] Optionally, the first oil pump assembly 100 in the embodiment of the present application also includes a first pointer pressure gauge 150, which is used to detect and display the hydraulic pressure at the position of the first pressure sensor 170; the second oil pump assembly 200 also includes a second pointer pressure gauge 250, which is used to detect and display the hydraulic pressure at the position of the second pressure sensor 270.

[0039] Optionally, the hydraulic system in the embodiment of the present application further includes a connecting valve 400 , which is used to connect the pressure oil output ends of the first pump oil assembly 100 and the second pump oil assembly 200 .

[0040] Optionally, the hydraulic system in the embodiment of the present application further includes an air filter 500, a fuel tank oil mark 600, a liquid level sensor 700, a temperature sensor 800 and an oil drain valve 900, and the air filter 500, the fuel tank oil mark 600, the liquid level sensor 700, the temperature sensor 800 and the oil drain valve 900 are respectively connected to the fuel tank 300. The air filter 500 is used to connect and purify the air inside and outside the fuel tank 300, the fuel tank oil mark 600 is used to display the oil amount in the fuel tank, the liquid level sensor 700 and the temperature sensor 800 are used to detect the liquid level of the fuel tank 300 and the temperature of the hydraulic oil, respectively, and the oil drain valve 900 is connected to the bottom of the fuel tank 300 to discharge the hydraulic oil.

[0041] The working principle of the hydraulic system in the embodiment of the present application is:

[0042] 1) P1 pressure output: The first motor 112 is started, driving the first oil pump 111 (specifically, it can be a plunger pump) to rotate. The hydraulic oil forms pressure after passing through the first oil pump 111, and enters the first oil filter 160 after passing through the first one-way valve 120 (the filter is provided with a blockage alarm. If the pressure difference between the input port and the output port is greater than 3.5 bar, an alarm is output to remind maintenance personnel that the filter element needs to be replaced). The hydraulic oil flows into the first hydraulic mechanism 10 through the outlet of the first oil filter 160 for use by the first hydraulic mechanism 10.

[0043] 2) P2 pressure output: The second motor 212 starts, driving the second oil pump 211 (specifically, it can be a plunger pump) to rotate. The hydraulic oil forms pressure after passing through the second oil pump 211, and enters the 12-2 second oil filter 260 after passing through the second one-way valve 220 (the filter is provided with a blockage alarm, and the output alarm is issued when the pressure difference between the input port and the output port is greater than 3.5 bar, reminding the maintenance personnel that the filter element needs to be replaced). The hydraulic oil flows into the second hydraulic mechanism 20 through the outlet of the second oil filter 260 for use by the second hydraulic mechanism 20.

[0044] 3) Mutual backup mode: When one of the oil pumps is damaged, the connecting valve 400 can be opened to supply oil through the other oil pump, and the on-site equipment can also be operated.

[0045] 4) System pressure protection: The first relief valve 140 is used to protect the P1 system pressure, and the adjustment value can be 10 MPa; the second relief valve 240 is used to protect the P2 system pressure, and the adjustment value can be 13 MPa.

[0046] Two hydraulic pumps are used to output two pressures, namely P1 and P2. P1 supplies oil to the paper pressing roller and the hydraulic mechanism that does not move synchronously with the paper pressing roller, ensuring the absolute stability of the line pressure control of the paper pressing roller and not being disturbed by the action of other hydraulic control equipment during normal operation. P2 supplies oil to other hydraulic mechanisms. There is a connecting valve between P1 and P2, which is closed under normal circumstances and can be opened in an emergency to use the pressure on the better side to operate the equipment urgently. The oil tank is designed to supply oil to the two pump oil components separately. When the proportional valve of the paper pressing roller is working, other hydraulic mechanisms that need to move synchronously are supplied with oil by another pump, avoiding the simultaneous action of the proportional valve control of the paper pressing roller and other action mechanisms, ensuring that the proportional valve is not affected by the pressure fluctuation of other hydraulic mechanisms when working, and maximally improving the accuracy and stability of the line pressure control of the paper pressing roller, which can prevent paper quality problems caused by unstable line pressure control.

[0047] The hydraulic system provided in the embodiment of the present application can provide synchronous or asynchronous hydraulic drive control for different hydraulic mechanisms by designing a dual-pump dual-output hydraulic control method. It has the characteristics of high control accuracy and stability, and can prevent paper quality problems caused by unstable control of the hydraulic system.

[0048] The above descriptions are only some embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also 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, a first oil pumping assembly and a second oil pumping assembly; the first oil pumping assembly includes a first oil pumping device and a first one-way valve connected in series, the oil inlet end of the first oil pumping device is connected to the oil tank, the oil outlet end of the first oil pumping device is connected to the first one-way valve, and the first oil pumping assembly is used to drive a first hydraulic mechanism; the second oil pumping assembly includes a second oil pumping device and a second one-way valve connected in series, the oil inlet end of the second oil pumping device is connected to the oil tank, the oil outlet end of the second oil pumping device is connected to the second one-way valve, and the second oil pumping assembly is used to drive a second hydraulic mechanism.

2. The hydraulic system according to claim 1, characterized in that: The first oil pumping device includes a first oil pump and a first motor, and the first motor is used to drive the first oil pump to pump oil from the oil tank; the second oil pumping device includes a second oil pump and a second motor, and the second motor is used to drive the second oil pump to pump oil from the oil tank.

3. The hydraulic system according to claim 2, characterized in that: The first oil pump assembly also includes a first stop valve, which is connected in series between the first oil pump and the oil tank; the second oil pump assembly also includes a second stop valve, which is connected in series between the second oil pump and the oil tank.

4. The hydraulic system according to claim 1, characterized in that: The first oil pump assembly also includes a first oil filter, which is connected in series between the first one-way valve and the first hydraulic mechanism; the second oil pump assembly also includes a second oil filter, which is connected in series between the second one-way valve and the second hydraulic mechanism.

5. The hydraulic system according to claim 4, characterized in that: The first oil pump assembly also includes a first overflow valve, one end of which is connected to the hydraulic oil pipeline between the first oil filter and the first hydraulic mechanism, and the other end is connected to the oil tank; the second oil pump assembly also includes a second overflow valve, one end of which is connected to the hydraulic oil pipeline between the second oil filter and the second hydraulic mechanism, and the other end is connected to the oil tank.

6. The hydraulic system according to claim 5, characterized in that: The first oil pump assembly also includes a first pressure sensor, which is used to detect the pressure in the hydraulic oil pipeline between the first overflow valve and the first hydraulic mechanism; the second oil pump assembly also includes a second pressure sensor, which is used to detect the pressure in the hydraulic oil pipeline between the second overflow valve and the second hydraulic mechanism.

7. The hydraulic system according to claim 6, characterized in that: The first oil pump assembly also includes a first pointer pressure gauge, which is used to detect and display the hydraulic pressure at the position of the first pressure sensor; the second oil pump assembly also includes a second pointer pressure gauge, which is used to detect and display the hydraulic pressure at the position of the second pressure sensor.

8. The hydraulic system according to claim 1, characterized in that: The hydraulic system also includes a connecting valve, which is used to connect the pressure oil output ends of the first oil pump assembly and the second oil pump assembly, thereby allowing the output circuits of the first oil pump assembly and the second oil pump assembly to serve as a backup for each other.

9. The hydraulic system according to claim 8, characterized in that: The hydraulic system further comprises an air filter, an oil tank oil mark, a liquid level sensor and a temperature sensor, wherein the air filter, the oil tank oil mark, the liquid level sensor and the temperature sensor are respectively connected to the oil tank.

10. A papermaking rewinding machine, characterized in that: The papermaking rewinder includes a first hydraulic mechanism, a second hydraulic mechanism and the hydraulic system according to any one of claims 1 to 9, wherein the first oil pump component of the hydraulic system is connected to the first hydraulic mechanism and is used to drive the first hydraulic mechanism, and the second oil pump component of the hydraulic system is connected to the second hydraulic mechanism and is used to drive the second hydraulic mechanism, wherein the first hydraulic mechanism is a paper pressing roller.

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