Loading damping independent adjusting hydraulic system of roll collar vertical type coal mill

Abstract

The invention discloses an onboard damping independent adjusting hydraulic system of a roll collar vertical type coal mill, which comprises an oil cylinder, a hydraulic control system and a hydraulic control system, the actuator is located in the oil cylinder and divides the oil cylinder into a first cavity and a second cavity, the first connector is located in the first cavity, and the second connector is located in the second cavity; the first loop is connected with the first cavity through a first interface, and the first loop at least comprises a first energy accumulator; and the second loop is connected with the second cavity through a second interface, and the second loop at least comprises a second energy accumulator. By independently adjusting cooperative work of the hydraulic cylinders, vibration can be more accurately controlled, impact and vibration of equipment are reduced, stable operation of the hydraulic system under various working conditions is ensured based on a control mechanism of pressure feedback, the hydraulic system is more convenient to install, maintain and expand due to modular design, and by optimizing the working state of the hydraulic cylinders, the working efficiency of the hydraulic system is improved. Energy loss is reduced, and system energy efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic systems, in particular to a roll ring vertical coal mill loading damping independent adjustment hydraulic system. BACKGROUND

[0002] With the widespread development of spot trading of the power system, the randomness of load fluctuation of coal power units increases, and the influence of coal market on the quality of incoming coal causes the worsening of the operating conditions of the coal mill, which aggravates the vibration and affects the rubbing of various systems of the coal mill, resulting in leakage. The deficiency of the current hydraulic damping technology leads to a far lower level of vibration suppression and operation of multiple parameters, which makes the coal mill unable to exert its normal efficiency in production, resulting in high energy consumption, serious wear and tear, high failure rate and other comprehensive losses. The roll ring vertical coal mill produces relatively large vibration and impact during operation, especially under high load or uneven working conditions, the vibration problem is more prominent. Although the traditional hydraulic system can alleviate vibration to a certain extent, its damping effect is limited under complex working conditions, and it is difficult to achieve fine vibration control.

[0003] The existing coal mill hydraulic loading system has the following technical problems:

[0004] 1. When the coal type changes, the loading force and the damping force change nonlinearly, the adaptability is insufficient, and the energy efficiency index performance is poor.

[0005] 2. When the unit load changes, the adjustment width between the minimum coal quantity adjustment and the designed and approved coal quantity is insufficient, and the adjustability is not strong.

[0006] 3. Under the condition of spot power grid, the severe vibration under low output cannot be effectively suppressed. SUMMARY

[0007] Therefore, the technical problem to be solved by the present application is that the loading force and the damping force change nonlinearly and the adaptability is insufficient.

[0008] The above technical problems are solved by the following technical solutions: the present application provides a loading damping independent adjustment hydraulic system, which comprises an oil cylinder having a first interface and a second interface;

[0009] an actuator located in the interior of the oil cylinder and dividing the oil cylinder into a first chamber and a second chamber, the first interface being in the first chamber and the second interface being in the second chamber;

[0010] a first circuit connected through the first interface and the first chamber, the first circuit comprising at least a first accumulator;

[0011] a second circuit connected through the second interface and the second chamber, the second circuit comprising at least a second accumulator.

[0012] In a preferred embodiment of the loading shock absorption independent adjustment hydraulic system described in the application: the oil cylinder is provided with a drain port connected to the second chamber.

[0013] In a preferred embodiment of the loading shock absorption independent adjustment hydraulic system described in the application: a return port is provided between the first circuit and the second circuit.

[0014] In a preferred embodiment of the loading shock absorption independent adjustment hydraulic system described in the application: the first circuit is further connected with a shock absorption oil port, and a proportional valve is provided between the shock absorption oil port and the first accumulator.

[0015] In a preferred embodiment of the loading shock absorption independent adjustment hydraulic system described in the application: the first accumulator is connected with a first overflow valve and a first check valve.

[0016] In a preferred embodiment of the loading shock absorption independent adjustment hydraulic system described in the application: the second accumulator is connected with a second overflow valve and a second check valve.

[0017] In a preferred embodiment of the loading shock absorption independent adjustment hydraulic system described in the application: the first circuit is connected with at least four bridge rectifier plate check valves, and the four bridge rectifier plate check valves form a bridge rectifier plate.

[0018] In a preferred embodiment of the loading shock absorption independent adjustment hydraulic system described in the application: the second circuit is provided with a loading oil port connected to the first accumulator.

[0019] In a preferred embodiment of the loading shock absorption independent adjustment hydraulic system described in the application: a first pressure gauge is provided between the first interface and the first accumulator, and a second pressure gauge is provided between the second interface and the second accumulator.

[0020] The application also proposes a roller ring vertical coal mill, the loading shock absorption independent adjustment hydraulic system described above; comprising, a mill roller support; a pull rod connected to the mill roller support, the pull rod being connected to an actuator.

[0021] The application has the beneficial effects that: through the coordinated work of the independent adjustment hydraulic cylinders, the vibration can be more accurately controlled, the impact and vibration of the equipment are reduced, the control mechanism based on pressure feedback ensures the stable operation of the hydraulic system under various working conditions, the modular design makes the installation, maintenance and expansion of the hydraulic system more convenient, through optimizing the working state of the hydraulic cylinder, the energy consumption is reduced, and the system energy efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the technical solutions of the embodiments of the present application clearer, the drawings of the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described in the following description only relate to some embodiments of the present application and are not a limitation on the present application. Among them:

[0023] Figure 1 The overall structure diagram of the shock-absorbing independent adjustment hydraulic system is shown;

[0024] Figure 2 The structure subdivision diagram of the first embodiment of the shock-absorbing independent adjustment hydraulic system is shown;

[0025] Figure 3 The structure subdivision diagram of the second embodiment of the shock-absorbing independent adjustment hydraulic system is shown;

[0026] Figure 4 The connection diagram of the shock-absorbing independent adjustment hydraulic system is shown;

[0027] Figure 5 The connection diagram of the coal mill is shown;

[0028] Figure 6 The working logic diagram of the shock-absorbing independent adjustment hydraulic system is shown.

[0029] 100, oil cylinder; 101, first interface; 102, second interface; 200, actuator; 201, first chamber; 202, second chamber; 300, first circuit; 301, first accumulator; 302, proportional valve; 303, first overflow valve; 304, first check valve; 305, first pressure gauge; 400, second circuit; 401, second accumulator; 402, second overflow valve; 404, second pressure gauge; 403, second check valve; 500, oil drain port; 600, oil return port; 700, shock-absorbing oil port; 801, first valve; 802, second valve; 803, third valve; 804, fourth valve. DETAILED DESCRIPTION

[0030] In order for those skilled in the art to have a better understanding of the present application, the present application will be further described in detail below in conjunction with specific embodiments and drawings.

[0031] The terms used in the present application are those general terms currently widely used in the art in consideration of the functions about the present application, but these terms can be changed according to the intention of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms can be selected by the applicant, and in this case, the detailed meanings thereof will be described in the detailed description of the present application. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present application.

[0032] ReferenceFigure 1 The embodiment provides a loading damping independent adjustment hydraulic system, which comprises a cylinder 100, a first interface 101 and a second interface 102, wherein the cylinder 100 is connected with an external loading oil source, and the external loading oil source can input hydraulic oil into the cylinder 100.

[0033] The system comprises an actuator 200 which is located in the cylinder 100 and divides the cylinder 100 into a first chamber 201 and a second chamber 202, wherein the first interface 101 is located in the first chamber 201 and the second interface 102 is located in the second chamber 202; in the embodiment, the actuator 200 is a piston structure, the actuator 200 can move relative to the cylinder 100, the moving direction of the actuator 200 is determined according to the pressure on both sides of the actuator 200, and the space in the cylinder 100 is divided into two spaces, i.e., the first chamber 201 and the second chamber 202, through the separation of the actuator 200; in actual application, the actuator 200 is connected with a roller frame of a coal mill, and the position and damping of the roller frame are adjusted through the hydraulic oil pressure in the first chamber 201 and the second chamber 202.

[0034] A first loop 300 is connected with the first interface 101 and the first chamber 201, and the first loop 300 at least comprises a first accumulator 301; a second loop 400 is connected with the second interface 102 and the second chamber 202, and the second loop 400 at least comprises a second accumulator 401.

[0035] When the system is normally operated, the oil provided by the external loading oil source enters the second chamber 202 of the cylinder 100, the actuator 200 in the cylinder 100 moves under the action of the oil pressure, the pressure of the actuator 200 is increased, and the oil flows to the second accumulator 401 through a pipeline, that is, the pressure energy of the oil is effectively transmitted and stored in the second accumulator 401 through the movement of the cylinder 100.

[0036] As shown in the figure, the system has a drain port 500, a return port 600, a damping oil port and a loading oil port 701, the drain port 500 is connected with an oil tank, the damping oil port 700 is connected with the first loop 300, and the loading oil port 701 is connected with the second loop 400.

[0037] When the system needs to reduce load, the high-pressure oil stored in the second accumulator 401 will release energy. The oil will flow to the first accumulator 301, and the double-accumulator variable load and damping independent response hydraulic cylinder module adopts load port independent control technology. The variable load device is independently compensated by an accumulator with a constant pressure or a variable pressure, and at the same time, the variable damping device is also independently compensated by an accumulator with a constant pressure or a variable pressure. The variable load and damping independent response hydraulic cylinder module sets the variable load device and specially sets the variable damping device, so that the damping pressure effect problem is solved. The movable state can dynamically respond to the load vibration state, and provide a hydraulic cylinder reaction force. The reaction force is independently responded by the accumulator on the variable damping device, and does not interfere with other hydraulic cylinder modules.

[0038] In the first embodiment of the present application, the oil cylinder 100 is provided with a drain port 500 connected with the second chamber 202, a return port 600 is arranged between the first circuit 300 and the second circuit 400, and a damping oil port 700 is further connected with the first circuit 300. A proportional valve 302 is arranged between the damping oil port 700 and the first accumulator 301, the first accumulator 301 is connected with a first overflow valve 303 and a first check valve 304, and the second accumulator 401 is connected with a second overflow valve 402 and a second check valve 403.

[0039] A first pressure gauge 305 is arranged between the first interface 101 and the first accumulator 301, and a second pressure gauge 404 is arranged between the second interface 102 and the second accumulator 401.

[0040] When the system is normally running, the oil provided by the external loading oil source enters the first chamber 201 of the oil cylinder 100, and the actuator 200 in the oil cylinder 100 moves under the action of the oil pressure, so that the oil pressure is raised. The high-pressure oil flows to the second accumulator 401 through the pipeline.

[0041] The specific path is: the oil extruded from the second interface 102 is guided by the second overflow valve 402 and the second check valve 403, and finally enters the second accumulator 401 to store energy, that is, the pressure energy of the oil is effectively transmitted and stored in the second accumulator 401 by the movement of the oil cylinder 100.

[0042] When the system needs to reduce load, the high-pressure oil stored in the second accumulator 401 will release energy. The oil will flow to the first accumulator 301 through the second overflow valve 402 and the second check valve 403, and the extruded oil is the "damping pressure oil", and the main source or associated accumulator is the first accumulator 301. This part of "damping pressure oil" is the working medium in the load reduction process.

[0043] Subsequently, the load reduction circuit adjustment process is started. The adjustment process is achieved by the opening of the proportional valve 302, for example, by means of continuous control of the proportional valve 302 valve opening degree through electrical signals, hydraulic pressure or mechanical displacement, the "shock absorbing pressure oil" released or flowed from the first accumulator 301 enters the proportional valve 302 for accurate pressure adjustment, and the proportional valve 302 continuously changes its flow area according to the instructions of the control system, thereby linearly adjusting the oil pressure passing through it. This mechanism of adjusting oil pressure through the opening of the proportional valve 302 is the core means to achieve system load reduction, ensuring that the change of system pressure is both fast and smooth, avoiding impact and large fluctuations, and the oil accurately adjusted by the proportional valve 302 is finally discharged through the load reduction circuit, part of which can be directly returned to the tank or low pressure part of the system through the oil return port 600.

[0044] In another embodiment of the application, the first circuit 300 is connected with at least four bridge rectifier plate one-way valves 800, which form a bridge rectifier plate, and the four bridge rectifier plate one-way valves 800 are respectively the first valve 801, the second valve 802, the third valve 803, and the third valve 803. In this embodiment, when the actuator 200 rises, the shock absorbing force plays a major role, and the pressure oil provided by the shock absorbing oil pump enters the first accumulator 301 and the first chamber 201 of the oil cylinder 100 through the first valve 801 of the bridge rectifier plate, the proportional valve 302, and the third valve 803. At this time, the actuator 200 is extended, and the oil in the second chamber 202 of the oil cylinder 100 is returned to the tank through the loading circuit, and the speed of the grinding roller can be controlled by adjusting the proportional valve 302.

[0045] When the actuator 200 is lowered, no shock absorbing pressure oil enters the cylinder, which can be supplemented by an external loading oil source at this time to supplement the oil in the second chamber 202 of the oil cylinder 100 to prevent the oil cylinder 100 from forming a vacuum. If the supplemented loading oil is insufficient, the oil cylinder 100 can also supplement oil from the tank through the first one-way valve 304 through overflow and oil supplement port; the oil in the second chamber 202 of the oil cylinder 100 is returned to the tank through the second one-way valve 4037, the proportional valve 302, and the fourth valve 804. The speed of the actuator 200 can be controlled by adjusting the proportional valve 302. It should be noted that due to the damping effect of the proportional valve 302, even if it is adjusted to the maximum, the grinding roller will not directly impact the grinding disc due to its own weight.

[0046] The application also provides a roller ring vertical mill with the above-mentioned loading and shock absorbing independent adjustment hydraulic system; comprising a grinding roller support 901; a pull rod 902 connected with the grinding roller support 901, and the pull rod 902 is connected with the actuator 200.

[0047] In this embodiment, the coal mill is in normal operation, at this time the oil cylinder 100 is subjected to the pressure of the first circuit 300 and the second circuit 400 simultaneously, but the pressure of the second circuit 400 is greater than that of the first circuit 300, thereby achieving grinding.

[0048] When the coal mill is grinding, the oil provided by the second circuit 400 enters the second accumulator 401 to complete energy storage, and at the same time enters the second rod cavity of the oil cylinder 100 to generate a loading force. When an external force causes the volume of the second cavity 202 of the oil cylinder 100 to decrease, the instantaneous loading pressure is too high, and the second accumulator 401 will absorb part of the pressure impact. The pressure oil that cannot be absorbed will be discharged through the second overflow valve 402 to ensure the safe operation of the equipment. When an external force causes the volume of the second cavity 202 of the oil cylinder 100 to increase, the instantaneous loading pressure of the second cavity 202 is insufficient, and the second accumulator 401 will supplement part of the pressure oil.

[0049] When the coal mill is grinding, the second circuit 400 always provides a reverse lifting force, that is, a damping force, to the oil cylinder 100. The specific oil flow is as follows: the pressure oil provided by the damping oil pump enters the first accumulator 301 to store energy and the second cavity 202 of the oil cylinder 100 through the first valve 801, the proportional valve 302 and the third valve 803 to generate a damping force.

[0050] When an external force causes the volume of the second cavity 202 of the oil cylinder 100 to decrease, the excess pressure oil will be absorbed by the second accumulator 401, and the pressure oil that cannot be absorbed will be discharged through the first overflow valve 303 to the oil tank. When an external force causes the volume of the first cavity 201 of the oil cylinder 100 to increase, the oil in the first accumulator 301 will quickly supplement the first cavity 201 of the oil cylinder 100.

[0051] In actual operation conditions, the damping pressure oil discharged through the first overflow valve 303 is extremely rare. Its main flow path is the bridge rectifier plate and the proportional valve 302. Through the bridge rectifier plate, the oil entering and exiting the first cavity 201 of the oil cylinder 100 is controlled by the proportional valve 302.

[0052] The core function of the first cavity 201 is to generate a reverse lifting force through oil. Based on this functional requirement, the cavity must have enough oil to avoid the oil cylinder 100 from being completely retracted instantaneously, causing the roller sleeve to collide with the grinding disc tile. When the frequency of the up-down action of the pull rod 902 of the coal mill is high, the size of the throttle hole of the proportional valve 302 is adjusted to adjust the damping stiffness of the oil cylinder 100 to slow down the oil discharge speed and maintain the damping force.

[0053] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present application.

Claims

1. A hydraulic system for independent adjustment of loading and damping, characterized in that: include, The hydraulic cylinder (100) has a first interface (101) and a second interface (102); An actuator (200) is located inside a hydraulic cylinder (100) and divides the hydraulic cylinder (100) into a first chamber (201) and a second chamber (202), wherein the first interface (101) is located in the first chamber (201) and the second interface (102) is located in the second chamber (202); A first circuit (300) is connected to a first chamber (201) via a first interface (101), and the first circuit (300) includes at least a first accumulator (301); A second circuit (400) is connected to a second interface (102) and a second chamber (202), and the second circuit (400) includes at least a second accumulator (401).

2. The independently adjustable hydraulic system for loading and damping according to claim 1, characterized in that: The oil cylinder (100) is provided with an oil drain port (500), which is connected to the second chamber (202).

3. The independently adjustable hydraulic system for loading and damping according to claim 1, characterized in that: An oil return port (600) is provided between the first circuit (300) and the second circuit (400).

4. The independently adjustable hydraulic system for loading and damping according to claim 1, characterized in that: The first circuit (300) is also connected to a damping oil port (700), and a proportional valve (302) is provided between the damping oil port (700) and the first accumulator (301).

5. The independently adjustable hydraulic system for loading and damping according to claim 3, characterized in that: The first accumulator (301) is connected to a first overflow valve (303) and a first check valve (304).

6. The independently adjustable hydraulic system for loading and damping according to claim 3, characterized in that: The second accumulator (401) is connected to a second overflow valve (402) and a second check valve (403).

7. The independently adjustable hydraulic system for loading and damping according to claim 4, characterized in that: The first circuit (300) is connected to at least four bridge rectifier one-way valves (800), and the four bridge rectifier one-way valves (800) form a bridge rectifier.

8. The independently adjustable hydraulic system for loading and damping according to claim 1, characterized in that: The second circuit (400) is provided with a loading port (701), which is connected to the first accumulator (301).

9. The independently adjustable hydraulic system for loading and damping according to claim 1, characterized in that: A first pressure gauge (305) is provided between the first interface (101) and the first accumulator (301), and a second pressure gauge (404) is provided between the second interface (102) and the second accumulator (401).

10. A vertical roller mill, characterized in that: The loading and damping independent adjustment hydraulic system described in any one of claims 1 to 9 is adopted; include, Grinding roller support (901); A pull rod (902) is connected to the grinding roller bracket (901), and the pull rod (902) is connected to the actuator (200).

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