A multi-functional superimposed hydraulic valve for a hydraulic lifting device

Abstract

The utility model discloses a multi -functional superimposed hydraulic valve for hydraulic lifting equipment, including valve block, balance valve, pressure reducing valve and check valve, balance valve, pressure reducing valve and check valve all install on the valve block, constitute superimposed hydraulic valve, the oil port of superimposed hydraulic valve includes T1 mouth, T2 mouth, P1 mouth, P2 mouth, A1 mouth, A2 mouth, B1 mouth and B2 mouth, T1 mouth with T2 mouth intercommunication, P1 mouth with P2 mouth intercommunication, balance valve is connected between A1 mouth and A2 mouth, and the control oil port of balance valve is linked together with B2 mouth, pressure reducing valve and check valve are connected between B1 mouth and B2 mouth, and the oil channel intercommunication between the oil outlet of pressure reducing valve and T1 mouth and T2 mouth, the utility model discloses the oil flow and pressure of automatic regulation through pressure reducing valve and balance valve in the equipment descending process, can reduce the impact that the dead weight of equipment causes to hydraulic system, guarantees the smooth operation of equipment, prolongs the service life of equipment.

Description

Technical Field

[0001] This utility model relates to a multi-functional superimposed hydraulic valve for hydraulic lifting equipment that integrates hydraulic lock function, balance valve function, pressure reducing valve function and overflow function, and belongs to the field of hydraulic technology. Background Technology

[0002] In metallurgical enterprises, especially bar mills, many pieces of equipment rely on hydraulic power. Typical hydraulic systems offer three functions: directional control, speed control, and self-locking. To achieve these three functions, standard solenoid directional valves, one-way throttle valves, and pilot-operated check valves are simply stacked together. It can be said that hydraulic systems with these three fixed functions are widely used and familiar to many. Furthermore, many hydraulic systems controlled by these three types of hydraulic valves are used in equipment performing lifting movements, such as… Figure 3 A hydraulic system using a conventional stacked hydraulic control check valve to control a lifting hydraulic cylinder is presented. While this system can basically meet the lifting requirements of the equipment, during operation, especially during descent, the equipment's weight and load exert significant impact on the hydraulic system, leading to unstable operation and frequent problems such as hydraulic line cracking, throttle valve core damage, broken directional valve end cap screws, and weld defects, severely affecting the equipment's service life. Therefore, designing a multi-functional stacked hydraulic valve suitable for hydraulic lifting equipment is essential. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a multi-functional stacked hydraulic valve for hydraulic lifting equipment, thereby reducing the impact of the equipment's own weight and load on the hydraulic system, ensuring stable operation of the equipment, and extending the equipment's service life.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A multifunctional stacked hydraulic valve for hydraulic lifting equipment includes a valve block, a balance valve, a pressure reducing valve, and a check valve. The balance valve, pressure reducing valve, and check valve are all mounted on the valve block, forming a stacked hydraulic valve. The stacked hydraulic valve has ports T1, T2, P1, P2, A1, A2, B1, and B2. Ports T1 and T2 are connected via an internal oil passage within the valve block; ports P1 and P2 are also connected via an internal oil passage within the valve block; the balance valve is connected between ports A1 and A2, and its control port is connected to port B2; the pressure reducing valve and check valve are connected in parallel between ports B1 and B2, and the pressure reducing valve's discharge port is connected to the oil passage between ports T1 and T2.

[0006] The aforementioned multi-functional stacked hydraulic valve for hydraulic lifting equipment also includes an overflow valve installed on the valve block, which is connected between port A2 and port T2.

[0007] The aforementioned multi-functional stacked hydraulic valve for hydraulic lifting equipment includes X1 port, X2 port, Y1 port and Y2 port. X1 port and X2 port are connected through an internal oil passage in the valve block; Y1 port and Y2 port are connected through an internal oil passage in the valve block.

[0008] The aforementioned multi-functional stacked hydraulic valve for hydraulic lifting equipment includes a cartridge-type balance valve, a cartridge-type pressure reducing valve, a cartridge-type check valve, and a cartridge-type relief valve.

[0009] This invention utilizes the self-locking function of the balance valve to keep the equipment stationary at a high position when it reaches the highest level. During the descent of the equipment, the oil flow and pressure are automatically adjusted by the pressure reducing valve and the balance valve, which can reduce the impact of the equipment's own weight and load on the hydraulic system, ensure stable operation of the equipment, and extend the service life of the equipment. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0011] Figure 1 This is a perspective view of the present invention;

[0012] Figure 2 This is a hydraulic schematic diagram of this utility model;

[0013] Figure 3 This is a hydraulic schematic diagram of a lifting hydraulic cylinder controlled by a conventional superimposed hydraulic check valve.

[0014] Figure 4 This is a hydraulic schematic diagram of the lifting hydraulic cylinder controlled by this utility model.

[0015] The following are the labels in the diagram: 1. Valve block, 2. Balance valve, 3. Relief valve, 4. Check valve, 5. Stacked hydraulic valve, 6. Pressure reducing valve, 7. Return oil throttling type stacked double check throttling valve, 8. Solenoid directional valve, 9. High-pressure ball valve, 10. Lifting hydraulic cylinder, 11. Stacked hydraulic control check valve, 12. Inlet oil throttling type stacked double check throttling valve. Detailed Implementation

[0016] This utility model addresses the shortcomings of existing technologies by providing a multi-functional stacked hydraulic valve for hydraulic lifting equipment. This hydraulic valve integrates the functions of a hydraulic lock, a balance valve, a pressure reducing valve, and an overflow valve, which can reduce the impact of the equipment's weight and load on the hydraulic valves and hydraulic pipelines in the hydraulic system, enabling the hydraulic lifting equipment to operate stably without impact or vibration during start-up and shutdown, avoiding equipment accidents, and extending the service life of the equipment.

[0017] See Figure 1 , Figure 2 and Figure 4 This utility model mainly includes a cartridge-type balance valve 2, a cartridge-type pressure reducing valve 6, a cartridge-type check valve 4, and a cartridge-type relief valve 3. These basic and commonly used valves are installed together on a valve block 1 to form a modular and universal stacked hydraulic valve. This stacked hydraulic valve has twelve oil ports: T1, T2, P1, P2, A1, A2, B1, B2, X1, X2, Y1, and Y2. Ports T1 and T2 are connected via an internal oil passage in valve block 1; ports P1 and P2 are connected via an internal oil passage in valve block 1; ports X1 and X2 are connected via an internal oil passage in valve block 1; and ports Y1 and Y2 are connected via an internal oil passage in valve block 1. An overflow valve 3 is located between ports A2 and T2. A balance valve 2 is located between ports A1 and A2, and its control port is connected to port B2. A pressure reducing valve 6 and a check valve 4 are connected in parallel between ports B1 and B2, and the discharge port of the pressure reducing valve 6 is connected to the oil passage between ports T1 and T2.

[0018] This utility model adopts a superimposed structure and is mainly used in hydraulic systems for lifting and lowering equipment. Figure 3 This is a hydraulic schematic diagram of a lifting hydraulic cylinder controlled by a conventional superimposed hydraulic check valve (hydraulic schematic diagram of the lifting trolley in the bar collection area of ​​the rolling mill of Shijiazhuang Iron and Steel Plant before its modification). Figure 4 This is a hydraulic schematic diagram of the lifting hydraulic cylinder controlled by this utility model (hydraulic schematic diagram of the modified bar and wire collection area lifting trolley in the rolling mill of Shijiazhuang Iron and Steel Plant). Please refer to it. Figure 2 and Figure 4When the equipment needs to rise, the solenoid directional valve 8 is in the right position. Pressurized oil enters port A1 through the solenoid directional valve 8 and the inlet throttling type superimposed double one-way throttle valve 12, then flows through the one-way valve of the balance valve 2 to port A2, and finally reaches the rod chamber of the lifting hydraulic cylinder 10 from port A2. During this process, the balance valve 2 is in the left position under the action of internal control oil and its own spring force, possessing a one-way flow self-locking function. At this time, the return oil from the rodless chamber of the lifting hydraulic cylinder 10 flows through port B2 via the bypass check valve 4 of the pressure reducing valve 6 to port B1, and then flows back to the oil tank from port B1 through the inlet throttling type superimposed double check valve 12 and the solenoid directional valve 8. At this time, the pressure reducing valve 6 does not play a pressure reducing role. When the equipment is raised to the highest position, the oil stops flowing, and the balance valve 2 plays a self-locking function to keep the equipment in the high position. When the equipment needs to be lowered, the solenoid directional valve 8 is in the left position, and the pressure oil enters port B1 through the solenoid directional valve 8 and the inlet throttling type superimposed double check valve 12, then flows through the pressure reducing valve 6 to port B2, and then flows from port B2 to the rodless chamber of the lifting hydraulic cylinder 10. During this process, the bypass check valve 4 is closed, the pressure reducing valve 6 reduces pressure, and the balance valve 2 is in the right position under the action of external control oil. At this time, the return oil from the rod chamber of the lifting hydraulic cylinder 10 enters port A2, then flows through the throttle valve of the balance valve 2 to port A1, and then flows back to the oil tank from port A1 through the inlet throttle type superimposed double check valve 12 and the solenoid reversing valve 8. During this process, the balance valve 2 automatically regulates the flow rate through its own throttle orifice, controlling the smooth descent of the equipment through return oil throttling until the equipment reaches the lowest position and stops moving, avoiding hydraulic shock and vibration generated during the descent and start-up / stopping of the equipment. During the entire lifting process of the equipment, the relief valve 3 is normally closed. When the pressure exceeds its set pressure, the relief valve 3 will automatically open to relieve pressure, playing a safety protection role. In addition, during maintenance or troubleshooting, the relief valve 3 can be manually opened to relieve pressure and lower the equipment to the lowest position, ensuring safe operation.

[0019] After using this utility model, the lifting trolley in the bar collection area of ​​the rolling mill of Shijiazhuang Iron and Steel Plant has a very smooth lifting and lowering action, and there is no obvious impact or vibration when starting and stopping. This avoids the occurrence of faults such as hydraulic pipeline cracking, throttle valve core damage, reversing valve end cover screw breakage, and equipment welding deformation.

[0020] This invention automatically adjusts the oil flow and pressure during the equipment's descent process using a pressure reducing valve and a balance valve in a stacked hydraulic valve system. This achieves automatic control of the descent's smoothness and avoids damage to the equipment and hydraulic system caused by hydraulic shock and vibration. When the equipment reaches its highest position, the balance valve's self-locking function keeps it stationary. Compared to traditional hydraulic systems controlled by pilot-operated check valves, this stacked hydraulic valve system possesses both the one-way self-locking function of a pilot-operated check valve and eliminates the negative impacts of shock and vibration caused by pilot-operated check valves on the hydraulic system, ensuring stable equipment operation and extending its service life.

Claims

1. A multi-functional stackable hydraulic valve for hydraulic lifting equipment, characterized in that, The system includes a valve block (1), a balance valve (2), a pressure reducing valve (6), and a check valve (4). The balance valve (2), pressure reducing valve (6), and check valve (4) are all mounted on the valve block (1) to form a stacked hydraulic valve. The oil ports of the stacked hydraulic valve include T1 port, T2 port, P1 port, P2 port, A1 port, A2 port, B1 port, and B2 port. The T1 port and T2 port are connected through the internal oil passage of the valve block (1). The P1 port and P2 port are connected through the internal oil passage of the valve block (1). The balance valve (2) is connected between the A1 port and the A2 port, and the control oil port of the balance valve (2) is connected to the B2 port. The pressure reducing valve (6) and the check valve (4) are connected in parallel between the B1 port and the B2 port. The unloading port of the pressure reducing valve (6) is connected to the oil passage between the T1 port and the T2 port.

2. A multi-functional stacked hydraulic valve for hydraulic lifting equipment according to claim 1, characterized in that, An overflow valve (3) is also installed on the valve block (1), and the overflow valve (3) is connected between port A2 and port T2.

3. A multi-functional stacked hydraulic valve for hydraulic lifting equipment according to claim 2, characterized in that, The oil ports of the superimposed hydraulic valve also include X1 port, X2 port, Y1 port and Y2 port. X1 port and X2 port are connected through the internal oil passage of valve block (1); Y1 port and Y2 port are connected through the internal oil passage of valve block (1).

4. A multi-functional stacked hydraulic valve for hydraulic lifting equipment according to claim 3, characterized in that, The balancing valve (2) is a cartridge-type balancing valve, the pressure reducing valve (6) is a cartridge-type pressure reducing valve, the one-way valve (4) is a cartridge-type one-way valve, and the overflow valve (3) is a cartridge-type overflow valve.

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