Grinding head follow-up hydraulic system of sharpening machine

Abstract

The utility model relates to a sharpening machine grinding head follow-up hydraulic system which comprises an oil tank, an oil pump, a first oil conveying pipe connected to a port A and a second oil conveying pipe connected to a port B. An electric proportional reversing valve is arranged on the first oil conveying pipe, an electromagnetic reversing valve is arranged on the second oil conveying pipe, and a first pressure sensor is arranged on the first oil conveying pipe. The first oil conveying pipe is provided with a first pressure sensor, the first pressure sensor is arranged between the electric proportional directional valve and an A port of the grinding head lifting cylinder, the second oil conveying pipe is provided with a second pressure sensor, the second pressure sensor is arranged between the electromagnetic directional valve and a B port of the grinding head lifting cylinder, and the electric proportional directional valve and a T port of the electromagnetic directional valve for discharging oil are both communicated with the oil tank. The first pressure sensor and the second pressure sensor are used for detecting the pressure of hydraulic oil of the port A and the port B, then the electric proportional directional valve and the electromagnetic directional valve are used for controlling the flow direction of the hydraulic oil according to pressure changes, and therefore lifting of the grinding head is controlled, the control precision of the electric proportional directional valve is higher, and the grinding head moves more accurately.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic control of a grinding machine, and in particular to a grinding head follow-up hydraulic system of a grinding machine. Background Art

[0002] The process of steel rolling line is generally that the steel billet is sent to the heating furnace to be heated to a specific temperature, then enters the rolling mill, and then transfers to the finishing collection, forming a finishing line from rolling to collection of steel. In order to achieve a good rolling effect, the steel billet grinding machine is one of the key equipment in this finishing line.

[0003] Since the surface of the steel billet will become uneven during the forging process of rolled steel parts, the grinding head of the grinding machine will continue to contact the surface of the steel billet during operation. Therefore, it is necessary to control the grinding head to move along with the uneven state of the steel billet surface to prevent damage to the grinding head.

[0004] However, the hydraulic systems currently available on the market for controlling the operation of the grinding head are usually controlled by ordinary valves, which makes it difficult for the grinding head to move accurately along the unevenness of the billet surface, and easily causes damage to the grinding head.

[0005] Therefore, it is necessary to propose a new technical solution to solve the above problems. Utility Model Content

[0006] In order to enable the grinding head to move accurately along with the uneven state of the billet surface, the present application provides a grinding head follow-up hydraulic system for a grinding machine.

[0007] The present application provides a grinding head follow-up hydraulic system for a grinding machine, which adopts the following technical solution:

[0008] A grinding head follow-up hydraulic system for a grinding machine comprises an oil tank, an oil pump for driving the flow of hydraulic oil, a first oil pipe connected to the A port of the grinding head lifting cylinder and a second oil pipe connected to the B port of the grinding head lifting cylinder, one end of the first oil pipe and the second oil pipe are simultaneously connected to the oil outlet of the oil pump, an electric proportional reversing valve for opening and closing the oil circuit is arranged on the first oil pipe, an electromagnetic reversing valve for opening and closing the oil circuit is arranged on the second oil pipe, a first pressure sensor is arranged on the first oil pipe, the first pressure sensor is arranged between the electric proportional reversing valve and the A port of the grinding head lifting cylinder, a second pressure sensor is arranged on the second oil pipe, the second pressure sensor is arranged between the electromagnetic reversing valve and the B port of the grinding head lifting cylinder, and the T port of the electric proportional reversing valve and the electromagnetic reversing valve for draining oil are both connected to the oil tank.

[0009] By adopting the above technical solution, the first pressure sensor and the second pressure sensor are used to detect the pressure of the hydraulic oil at port A and port B, and then the electric proportional reversing valve and the electromagnetic reversing valve are used to control the flow direction of the hydraulic oil according to the change in pressure, thereby controlling the lifting and lowering of the grinding head. At the same time, the control accuracy of the electric proportional reversing valve is higher, so that the movement of the grinding head is more accurate.

[0010] Optionally: an electric proportional overflow valve is also provided on the first oil pipeline, one end of the electric proportional overflow valve is provided between the first pressure sensor and the electric proportional reversing valve, and the other end of the electric proportional overflow valve is connected to the oil tank.

[0011] By adopting the above technical scheme, the electric proportional relief valve is used to stabilize the pressure of the hydraulic oil on the first oil pipeline. After the pressure of the hydraulic oil in the first oil pipeline increases, the electric proportional relief valve is used to discharge a part of the hydraulic oil in the first oil pipeline, so that the pressure of the hydraulic oil in the first oil pipeline is not easy to be too high, making the use of the equipment safer.

[0012] Optionally: a safety overflow valve is provided on the second oil pipeline, one end of the safety overflow valve is provided between the electromagnetic reversing valve and the second pressure sensor, and the other end of the safety overflow valve is connected to the oil tank.

[0013] By adopting the above technical solution, the pressure of the hydraulic oil in the second oil pipeline is stabilized by using a safety relief valve. When the pressure of the hydraulic oil in the second oil pipeline is too high, the safety relief valve can be used to discharge part of the hydraulic oil, so that the equipment can operate under a safe pressure.

[0014] Optionally: one end of the first oil pipeline and the second oil pipeline connected to the oil pump is commonly connected to an electromagnetic overflow valve, and the other end of the electromagnetic overflow valve is connected to the oil tank.

[0015] By adopting the above technical solution, the pressure between the electric proportional reversing valve, the electromagnetic reversing valve and the oil pump is balanced. After the electric proportional reversing valve and the electromagnetic reversing valve are closed, while the oil pump is still working, the electromagnetic overflow valve can return part of the hydraulic oil to the oil tank according to the pressure of the hydraulic oil, thereby reducing the amount of hydraulic oil in the pipeline, so that the pressure of the hydraulic oil will not be too high.

[0016] Optional: The first oil pipeline and the second oil pipeline are connected to one end of the oil pump and are commonly connected to a high-pressure filter, the electromagnetic overflow valve is arranged between the oil pump and the high-pressure filter, a one-way valve conducting toward the high-pressure filter is also arranged between the electromagnetic overflow valve and the electromagnetic overflow valve, and a system pressure sensor is also arranged between the one-way valve and the electromagnetic overflow valve.

[0017] By adopting the above technical solution, when the oil pump delivers the hydraulic oil, the high-pressure filter is used to buffer the fast-flowing hydraulic oil, so that the hydraulic oil is not easy to directly impact the electric proportional reversing valve and the electromagnetic reversing valve. At the same time, the one-way valve can also prevent the hydraulic oil from directly rebounding to the oil pump.

[0018] Optionally: an oil suction filter is provided at the oil inlet of the oil pump.

[0019] By adopting the above technical scheme, when the oil pump sucks in the hydraulic oil, the oil suction filter is used to filter the impurities, so that the impurities in the hydraulic oil are not easily entered into the grinding head lifting cylinder directly, and the flow of the hydraulic oil in the grinding head lifting cylinder is not easily blocked, so that the stable use of the grinding head lifting cylinder is not easily affected.

[0020] Optional: The oil suction filter includes a filter shell arranged in a polygonal cone shape, a plurality of first filter elements and a plurality of second filter elements arranged on the side wall of the filter shell, the bottom surface of the filter shell is connected to the oil inlet of the oil pump, the side walls of the filter shell are provided with a plurality of filter holes connected to the inner cavity thereof, the side walls of the filter shell are simultaneously provided with a first filter element and a second filter element, the first filter element is arranged at a position of the side wall of the filter shell away from the bottom surface, the first filter element and the second filter element jointly close the filter hole, a connecting pipe is coaxially arranged outside the filter shell, and the connecting pipe extends in a direction away from the oil pump.

[0021] By adopting the above technical solution, after the hydraulic oil enters the connecting pipe, it moves toward the filter shell, and then the surfaces of the first filter element and the second filter element are flushed, so that impurities attached to the first filter element and the second filter element move along the inclined direction of the filter shell, so that it is difficult for impurities to adhere to the first filter element, thereby increasing the service life of the first filter element.

[0022] Optionally: The filter shell is provided with a limit assembly for respectively limiting the positions of the first filter element and the second filter element, the limit assembly includes a filter frame rotatably connected to the filter shell and a limit screw for limiting the rotation of the filter frame, the filter frame surface is penetrated by a clearance hole, the filter frame is arranged on the side wall of the filter shell away from the first filter element and the second filter element and abuts against it, the limit screw passes through the filter frame and cooperates with the filter shell thread.

[0023] By adopting the above technical solution, when replacing the first filter element and the second filter element, the first filter element and the second filter element can be disassembled by simply rotating the filter frame, thereby making the replacement of the first filter element and the second filter element more convenient.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. Use the first pressure sensor and the second pressure sensor to detect the pressure of the A port and the B port of the grinding head lifting cylinder, and then use the electric proportional reversing valve and the electromagnetic reversing valve to control the flow direction of the hydraulic oil, so that the grinding head lifting cylinder can move accurately and keep the pressure of the hydraulic oil constant, so that the grinding head can move along the concave and convex surface of the steel billet;

[0026] 2. Impurities in the hydraulic oil are filtered by setting a filter shell in a polygonal pyramid shape, and the flow of the hydraulic oil is also used to flush the impurities attached to the first filter element, thereby increasing the service life of the first filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram for illustrating the structure of an oil suction filter according to an embodiment of the present application.

[0029] In the figure, 1. oil tank; 11. oil pump; 12. oil outlet pipe; 13. system pressure sensor; 14. high pressure filter; 15. one-way valve; 16. electromagnetic overflow valve; 2. first oil pipeline; 21. electric proportional reversing valve; 22. first pressure sensor; 23. electric proportional overflow valve; 3. second oil pipeline; 31. electromagnetic reversing valve; 32. second pressure sensor; 33. safety overflow valve; 35. return oil filter; 36. accumulator; 4. oil suction filter; 41. filter shell; 411. filter hole; 42. first filter element; 43. second filter element; 44. connecting pipe; 5. limit assembly; 51. filter frame; 511. clearance hole; 52. limit screw. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings.

[0031] The present application discloses a grinding head follow-up hydraulic system for a grinding machine, such as Figure 1As shown, it includes an oil tank 1 for storing hydraulic oil, an oil pump 11 for driving the flow of hydraulic oil, a first oil delivery pipe 2 for connecting to the A port of the grinding head lifting cylinder, and a second oil delivery pipe 3 for connecting to the B port of the grinding head lifting cylinder. The hydraulic oil is injected into the A port of the grinding head lifting cylinder to drive the piston rod of the grinding head lifting cylinder to extend. In this embodiment, the oil pump 11 uses a load-sensitive pump. An oil outlet pipe 12 is provided at the oil inlet of the oil pump 11. The end of the oil outlet pipe 12 away from the oil pump 11 is connected to the first oil delivery pipe 2 and the second oil delivery pipe 3 at the same time. An oil suction filter is provided at the oil inlet of the oil pump 11, and the oil suction filter is provided in the oil tank 1. The first oil pipeline 2 is provided with an electric proportional reversing valve 21 for opening and closing the oil circuit. The P port of the electric proportional reversing valve 21 for oil inlet is connected to the first oil pipeline 2, the D port of the electric proportional reversing valve 21 for oil outlet is connected to the A port of the grinding head lifting cylinder, and the T port of the electric proportional reversing valve 21 for oil return is connected to the oil tank 1. A first pressure sensor 22 is provided between the D port of the electric proportional reversing valve 21 and the A port of the grinding head lifting cylinder to detect the pressure of the hydraulic oil inside the grinding head lifting cylinder.

[0032] The second oil pipeline 3 is provided with an electromagnetic reversing valve 31 for opening and closing the oil circuit. The P port of the electromagnetic reversing valve 31 for oil inlet is connected to the second oil pipeline 3, the D port of the electromagnetic reversing valve 31 for oil outlet is connected to the B port of the grinding head lifting cylinder, and the T port of the electromagnetic reversing valve 31 for oil return is connected to the oil tank 1. A second pressure sensor 32 is provided between the D port of the electromagnetic reversing valve 31 and the B port of the grinding head lifting cylinder, and an accumulator 36 is also provided on the B port of the grinding head lifting cylinder. The pressure of the hydraulic oil inside the grinding head lifting cylinder is detected by the first pressure sensor 22 and the second pressure sensor 32. When the first pressure sensor 22 detects that the pressure increases, the electric proportional reversing valve 21 can be used to control the reflux of the hydraulic oil, so that the piston rod of the grinding head lifting cylinder retracts, so that the grinding head can rise and reduce the probability of damage to the grinding head, and the electric proportional reversing valve 21 controls the hydraulic oil more accurately.

[0033] In order to prevent the hydraulic oil pressure from being too high when the hydraulic oil is input from the first oil pipeline 2 toward the grinding head lifting cylinder, an electric proportional relief valve 23 is further provided on the first oil pipeline 2. One end of the electric proportional relief valve 23 is connected to the D port of the electric proportional reversing valve 21, and the other end of the electric proportional relief valve 23 is connected to the T port of the electric proportional reversing valve 21. When the pressure of the hydraulic oil in the first oil pipeline 2 is greater than the rated pressure set on the electric proportional relief valve 23, the electric proportional relief valve 23 can discharge part of the hydraulic oil to reduce the pressure in the first oil pipeline 2 and improve the safety of the equipment.

[0034] The second oil pipeline 3 is provided with a safety relief valve 33 for reducing the internal pressure thereof. One end of the safety relief valve 33 is connected to the C port of the electromagnetic reversing valve 31, and the other end of the safety relief valve 33 is connected to the T port of the electromagnetic reversing valve 31. Therefore, when the pressure of the hydraulic oil in the second oil pipeline 3 exceeds the rated power set by the safety relief valve 33, part of the hydraulic oil can be discharged to prevent the pressure in the second oil pipeline 3 from being too high.

[0035] An electromagnetic overflow valve 16 is provided on the oil outlet pipe 12, one end of the electromagnetic overflow valve 16 is connected to the oil outlet pipe 12, and the other end of the electromagnetic overflow valve 16 is connected to the oil tank 1, so that after the pressure of the hydraulic oil between the oil pump 11 and the electric proportional reversing valve 21 and the electromagnetic reversing valve 31 increases, part of the hydraulic oil can be discharged through the electromagnetic overflow valve 16 to prevent the pressure from being too high.

[0036] The oil outlet pipe 12 is also provided with a system pressure sensor 13 for detecting the pressure of the hydraulic oil, so as to detect the pressure of the hydraulic oil output by the oil pump 11. After the electromagnetic reversing valve 31 and the electric proportional reversing valve 21 are closed, the pressure in the oil outlet pipe 12 can be detected, so as to stop the oil pump 11 in time. A high-pressure filter 14 is provided at one end of the oil outlet pipe 12 away from the oil pump 11, and the other end of the high-pressure filter 14 is connected to the first oil delivery pipe 2 and the second oil delivery pipe 3. The high-pressure filter 14 is used to buffer the movement of the hydraulic oil, so that the electric proportional reversing valve 21 and the electromagnetic reversing valve 31 are not easily impacted. A one-way valve 15 is also provided between the high-pressure filter 14 and the pressure sensor, and the one-way valve 15 is conducted toward the high-pressure filter 14, so that the hydraulic oil in the high-pressure filter 14 will not recoil toward the oil pump 11.

[0037] The T port of the electric proportional reversing valve 21, the T port of the electromagnetic reversing valve 31, the ports for oil return of the electric proportional relief valve 23, the safety relief valve 33 and the electromagnetic relief valve 16 are interconnected, and a return oil filter 35 is commonly provided near the oil tank 1, so that when the hydraulic oil flows back into the oil tank 1, the returning hydraulic oil can be filtered to a certain extent, thereby reducing the content of impurities in the hydraulic oil in the oil tank 1.

[0038] like Figure 1 and Figure 2As shown, in order to prevent impurities in the hydraulic oil from directly entering the oil pump 11, an oil suction filter 4 is also provided at the oil inlet of the oil pump 11. The oil suction filter 4 includes a filter housing 41 in the shape of a quadrangular pyramid, four first filter elements 42 and four second filter elements 43 provided on the four side walls of the filter housing 41. The filter housing 41 is hollow, and the bottom surface of the filter is connected to the oil inlet of the oil pump 11. The four side walls of the filter housing 41 are penetrated with a plurality of filter holes 411 connected to the inner cavity thereof. A first filter element 42 and a second filter element 43 are provided on each side wall of the filter housing 41. The first filter element 42 is provided at a position of the side wall of the filter housing 41 away from the bottom surface. The first filter element 42 and the second filter element 43 cover all the filter holes 411 on the filter housing 41, so that the hydraulic oil is filtered by the first filter element 42 and the second filter element 43 when passing through the filter holes 411. A connecting pipe 44 is coaxially mounted outside the filter housing 41, and the connecting pipe 44 is threadedly connected to the filter housing 41. The filter housing 41 is entirely located in the connecting pipe 44, and one end of the connecting pipe 44 away from the oil pump 11 is located at the top of the filter housing 41 away from the oil pump 11. When the hydraulic oil enters the connecting pipe 44 and then enters the filter housing 41, the hydraulic oil washes the impurities attached to the first filter element 42, so that the impurities on the first filter element 42 are not easily attached, thereby increasing the service life of the first filter element 42.

[0039] The filter housing 41 is also provided with a limiting assembly 5 for limiting the positions of the first filter element 42 and the second filter element 43, respectively. The limiting assembly 5 includes a filter frame 51 rotatably connected to the filter housing 41 and a limiting screw 52 for limiting the position of the filter frame 51. The surface of the filter frame 51 is penetrated with a clearance hole 511. The projection of the clearance hole 511 on the surface of the filter housing 41 covers the filter hole 411 covered by the first filter element 42 or the second filter element 43 defined by the filter frame 51. The filter frame 51 abuts against the end surface of the first filter element 42 or the second filter element 43 away from the filter housing 41, thereby limiting the positions of the first filter element 42 and the second filter element 43. The limiting screw 52 is penetrated at one end of the filter frame 51 away from the rotation axis, passes through the filter frame 51 and is threadedly engaged with the filter housing 41.

[0040] The implementation principle of this embodiment is as follows: the oil pump 11 pumps the hydraulic oil in the oil tank 1 into the oil outlet pipe 12, the electromagnetic reversing valve 31 and the electric proportional reversing valve 21 control the hydraulic oil to enter the A port or the B port of the grinding head lifting cylinder, and when the grinding head is working, the first pressure sensor 22 and the second pressure sensor 32 are used to detect the change in the pressure of the hydraulic oil, thereby controlling the operation of the electromagnetic reversing valve 31 and the electric proportional reversing valve 21, so that the pressure of the hydraulic oil in the grinding head lifting cylinder can be maintained at the rated value, so that the grinding head controlled by the grinding head lifting cylinder can move with the changes in the concave and convex of the steel billet.

[0041] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A grinding head follow-up hydraulic system for a grinding machine, characterized in that: The invention comprises an oil tank (1), an oil pump (11) for driving the flow of hydraulic oil, a first oil delivery pipe (2) connected to the A port of the grinding head lifting cylinder, and a second oil delivery pipe (3) connected to the B port of the grinding head lifting cylinder. One end of the first oil delivery pipe (2) and the second oil delivery pipe (3) are simultaneously connected to the oil outlet of the oil pump (11). The first oil delivery pipe (2) is provided with an electric proportional reversing valve (21) for opening and closing the oil circuit. The second oil delivery pipe (3) is provided with an electromagnetic reversing valve (31) for opening and closing the oil circuit. The first oil delivery pipe (2) is provided with a first pressure sensor (22). The first pressure sensor (22) is provided between the electric proportional reversing valve (21) and the A port of the grinding head lifting cylinder. The second oil delivery pipe ( 3) is provided with a second pressure sensor (32), the second pressure sensor (32) is arranged between the electromagnetic reversing valve (31) and the B port of the grinding head lifting cylinder, and the T port for draining oil of the electric proportional reversing valve (21) and the electromagnetic reversing valve (31) are both connected to the oil tank (1).

2. The grinding head follow-up hydraulic system of a grinding machine according to claim 1, characterized in that: The first oil delivery pipe (2) is also provided with an electric proportional overflow valve (23), one end of the electric proportional overflow valve (23) is arranged between the first pressure sensor (22) and the electric proportional reversing valve (21), and the other end of the electric proportional overflow valve (23) is connected to the oil tank (1).

3. The grinding head follow-up hydraulic system of a grinding machine according to claim 1, characterized in that: The second oil delivery pipe (3) is provided with a safety overflow valve (33), one end of the safety overflow valve (33) is arranged between the electromagnetic reversing valve (31) and the second pressure sensor (32), and the other end of the safety overflow valve (33) is connected to the oil tank (1).

4. The grinding head follow-up hydraulic system of a grinding machine according to claim 1, characterized in that: One end of the first oil delivery pipe (2) and the second oil delivery pipe (3) connected to the oil pump (11) is commonly connected to an electromagnetic overflow valve (16), and the other end of the electromagnetic overflow valve (16) is connected to the oil tank (1).

5. The grinding head follow-up hydraulic system of a grinding machine according to claim 4, characterized in that: One end of the first oil delivery pipe (2) and the second oil delivery pipe (3) connected to the oil pump (11) is commonly connected to a high-pressure filter (14); the electromagnetic overflow valve (16) is arranged between the oil pump (11) and the high-pressure filter (14); a one-way valve (15) conducting toward the high-pressure filter (14) is also arranged between the electromagnetic overflow valve (16) and the electromagnetic overflow valve (16); and a system pressure sensor (13) is also arranged between the one-way valve (15) and the electromagnetic overflow valve (16).

6. The grinding head follow-up hydraulic system of a grinding machine according to claim 1, characterized in that: An oil suction filter (4) is provided at the oil inlet of the oil pump (11).

7. The grinding head follow-up hydraulic system of a grinding machine according to claim 6, characterized in that: The oil suction filter (4) comprises a filter housing (41) arranged in a multi-faceted pyramid shape, a plurality of first filter elements (42) and a plurality of second filter elements (43) arranged on the side wall of the filter housing (41); the bottom surface of the filter housing (41) is in communication with the oil inlet of the oil pump (11); the side walls of the filter housing (41) are provided with a plurality of filter holes (411) in communication with the inner cavity thereof; the side walls of the filter housing (41) are provided with a first filter element (42) and a second filter element (43); the first filter element (42) is arranged at a position of the side wall of the filter housing (41) away from the bottom surface; the first filter element (42) and the second filter element (43) jointly close the filter holes (411); a connecting pipe (44) is coaxially arranged outside the filter housing (41); the connecting pipe (44) extends in a direction away from the oil pump (11).

8. The grinding head follow-up hydraulic system of a grinding machine according to claim 7, characterized in that: The filter shell (41) is provided with a limiting assembly (5) for limiting the positions of the first filter element (42) and the second filter element (43), respectively. The limiting assembly (5) comprises a filter frame (51) rotatably connected to the filter shell (41) and a limiting screw (52) for limiting the rotation of the filter frame (51). A clearance hole (511) is penetrated through the surface of the filter frame (51). The filter frame (51) is arranged on and abuts against the side wall of the filter shell (41) away from the first filter element (42) and the second filter element (43). The limiting screw (52) passes through the filter frame (51) and is threadedly engaged with the filter shell (41).

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