Variable-loading hydraulic system with defoaming function for vertical coal mill
By using dual pumps, high-pressure double-cylinder filters, proportional overflow valves, speed control valves and metal mesh defoaming devices in the coal vertical grinding hydraulic system, the problem of system inability to hover, unadjustable grinding roller speed and many bubbles in the oil tank are solved, and the cylinder height controllable grinding roller speed and improved system stability are achieved.
Patent Information
- Application Number
- CN202422066097.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-26
AI Technical Summary
The existing coal vertical grinding hydraulic system cannot hover at specific oil positions as needed, the rising and falling speeds of the grinding rollers are unadjustable, and the many bubbles in the oil tank cause pump vibration and noise, affecting system stability.
A coal vertical milling and variable loading hydraulic system with defoaming function is designed, using a dual pump and a high-pressure double-cylinder filter. The cylinder hovering and grinding roller speed adjustment are achieved through a proportional relief valve and speed control valve mechanism, and a metal mesh defoaming device is installed in the oil tank to reduce bubbles.
The height controllable hover of the oil cylinder is achieved, which facilitates on-site maintenance, and the rising and falling speeds of the grinding rollers are adjustable, which improves working performance; at the same time, it reduces bubbles in the oil, reduces the vibration and noise of the pump, and improves the stability of the system.
Smart Images
Figure CN222977108U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a hydraulic system for a vertical coal mill. Background Art
[0002] In the existing hydraulic system for a vertical coal mill, the lifting cylinder cannot hover at a specific oil level as required, which is not convenient for on-site maintenance; the rising and falling speeds of the grinding rollers are not adjustable, affecting the working performance and need to be further improved; there are many air bubbles in the oil tank of the existing technology, which easily cause vibration and noise of the pump, affecting the stability of the system operation. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a variable loading hydraulic system for a vertical coal mill with a defoaming function, which can control the staying height of the cylinder, facilitate on-site maintenance, realize adjustable rising and falling speeds of the grinding rollers, and improve the working performance.
[0004] The technical solution of the utility model is as follows:
[0005] A variable loading hydraulic system for a vertical coal mill with a defoaming function, comprising two oil pumps communicated with an oil tank, one in use and one in reserve. The characteristics are: the oil pumps are double pumps, each pump of the double pump is respectively connected with a first high-pressure double-tube filter and a second high-pressure double-tube filter. The first high-pressure double-tube filter is communicated with the rodless cavity of the lifting hydraulic cylinder through a first oil supply line. A first proportional overflow valve branch is arranged on the first oil supply line behind the first high-pressure double-tube filter. The first proportional overflow valve on the first proportional overflow valve branch is connected with an overflow return oil line leading to the oil tank. A check valve, a filter and a cooler are successively arranged on the overflow return oil line. An electromagnetic valve for controlling the hovering of the lifting hydraulic cylinder is arranged on the first oil supply line behind the first proportional overflow valve branch; the second high-pressure double-tube filter is communicated with the rod cavity of the lifting hydraulic cylinder through a second oil supply line. A second proportional overflow valve branch is arranged on the second oil supply line behind the second high-pressure double-tube filter. The second proportional overflow valve on the second proportional overflow valve branch is connected with the overflow return oil line. A speed regulating valve mechanism for adjusting the rising and falling speeds of the grinding rollers is arranged on the second oil supply line behind the second proportional overflow valve branch; the speed regulating valve mechanism comprises two speed regulating valves connected in series, and each speed regulating valve is respectively connected in parallel with a first check valve and a second check valve, and the directions of the first check valve and the second check valve are opposite; a first return oil line leading to the oil tank is connected to the first oil supply line, and a second return oil line leading to the oil tank is connected to the second oil supply line; a defoaming device is arranged inside the oil tank, and the defoaming device is in the form of a detachable metal mesh.
[0006] An accumulator and a safety valve are connected to the first return oil line; an accumulator and a safety valve are connected to the second return oil line.
[0007] The utility model is provided with an oil cylinder hovering device, which can remotely control the oil cylinder to stay at any height, facilitating on-site maintenance. A high-pressure double-barrel filter is arranged at the outlet of each of the double pumps to reduce oil impurities in the oil fluid and improve the system stability. The rising and falling speeds of the grinding rollers can be adjusted, effectively improving the working performance. An anti-foaming device is arranged inside the oil tank to reduce the bubbles in the oil fluid, reduce the vibration and noise of the pump, and improve the stability of the system operation. Brief Description of the Drawings
[0008] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0009] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model. Detailed Embodiment
[0010] A variable-loading hydraulic system for a coal vertical mill with an anti-foaming function includes two oil pumps 2 communicated with an oil tank 1, one in use and one in reserve. The oil pumps are double pumps, and each pump of the double pump is respectively connected to a first high-pressure double-barrel filter 3 and a second high-pressure double-barrel filter 4. The first high-pressure double-barrel filter is communicated with the rodless cavity of a lifting hydraulic cylinder 5 through a first oil supply line. A first proportional overflow valve branch is arranged on the first oil supply line behind the first high-pressure double-barrel filter. The first proportional overflow valve 6 on the first proportional overflow valve branch is connected to an overflow return oil line leading to the oil tank. A check valve 7, a filter 8, and a cooler 9 are sequentially arranged on the overflow return oil line. An electromagnetic valve 10 for controlling the hovering of the lifting hydraulic cylinder is arranged on the first oil supply line behind the first proportional overflow valve branch; the second high-pressure double-barrel filter is communicated with the rod cavity of the lifting hydraulic cylinder through a second oil supply line. A second proportional overflow valve branch is arranged on the second oil supply line behind the second high-pressure double-barrel filter. The second proportional overflow valve 11 on the second proportional overflow valve branch is connected to the overflow return oil line. A speed regulating valve mechanism for adjusting the rising and falling speeds of the grinding rollers is arranged on the second oil supply line behind the second proportional overflow valve branch; the speed regulating valve mechanism includes two speed regulating valves 12 and 13 connected in series, and each speed regulating valve is respectively connected in parallel with a first check valve 14 and a second check valve 15, and the directions of the first check valve and the second check valve are opposite; a first return oil line 16 leading to the oil tank is connected to the first oil supply line, and a second return oil line 17 leading to the oil tank is connected to the second oil supply line; an anti-foaming device 22 is arranged inside the oil tank, and the anti-foaming device is in a form of a detachable metal mesh.
[0011] An accumulator 18 and a safety valve 19 are connected to the first return oil line; an accumulator 20 and a safety valve 21 are connected to the second return oil line.
[0012] An oil cylinder hovering device is set up, and a leak-free solenoid valve is set at the outlet of the oil station. By controlling the on / off of the solenoid valve, the on / off of the oil circuit is controlled, enabling the oil cylinder to stay at any height, which is convenient for on-site maintenance. A high-pressure double-barrel filter is set at the outlet of each of the double pumps, and the oil is filtered before being supplied to the system, reducing component failures caused by impurities in the oil in the fuel tank and improving the stability of the system. A defoaming device is set inside the fuel tank. The oil inlet area and the oil return area of the fuel tank are separated by a wire mesh. The oil passing through the wire mesh can reduce the air bubbles in the oil, avoid cavitation phenomenon after the pump sucks oil, reduce the vibration and noise of the pump, and improve the stability of the system operation.
Claims
1. A coal vertical mill variable loading hydraulic system with defoaming function, comprising two oil pumps connected to the oil tank, one for use and one for standby, characterized in that: The oil pump is a double pump, each pump of the double pump is connected to the first high-pressure double-barrel filter and the second high-pressure double-barrel filter respectively, the first high-pressure double-barrel filter is communicated with the rodless chamber of the lifting hydraulic cylinder through the first oil supply oil circuit, a first proportional overflow valve branch is arranged on the first oil supply oil circuit and behind the first high-pressure double-barrel filter, the first proportional overflow valve on the first proportional overflow valve branch is connected to the overflow return oil circuit leading to the oil tank, a one-way valve, a filter, and a cooler are arranged in sequence on the overflow return oil circuit, a solenoid valve for controlling the suspension of the lifting hydraulic cylinder is arranged on the first oil supply oil circuit and behind the first proportional overflow valve branch; the second high-pressure double-barrel filter is communicated with the rod chamber of the lifting hydraulic cylinder through the second oil supply oil circuit, A second proportional overflow valve branch is arranged on the second oil supply oil circuit and behind the second high-pressure duplex filter, the second proportional overflow valve on the second proportional overflow valve branch is connected to the overflow return oil circuit, and a speed regulating valve mechanism for adjusting the rising and falling speeds of the grinding roller is arranged on the second oil supply oil circuit and behind the second proportional overflow valve branch; the speed regulating valve mechanism includes two speed regulating valves connected in series, each speed regulating valve is respectively connected in parallel with the first check valve and the second check valve, and the directions of the first check valve and the second check valve are opposite; the first oil supply oil circuit is connected to the first return oil circuit leading to the oil tank, and the second oil supply oil circuit is connected to the second return oil circuit leading to the oil tank; a defoaming device is arranged inside the oil tank, and the defoaming device is in the form of a detachable metal mesh.
2. The coal vertical mill variable loading hydraulic system with defoaming function according to claim 1 is characterized by: The first oil return line is connected with an accumulator and a safety valve; the second oil return line is connected with an accumulator and a safety valve.