Hydraulic control circuit for damping quick opening cylinder of straightening machine

Abstract

The utility model belongs to hydraulic control loop technical field relates to a kind of for straightening machine quick open cylinder damping hydraulic control loop, comprising: pilot pressure reducing valve, the inlet of pilot pressure reducing valve is connected the high-pressure hydraulic oil of hydraulic system, for the high-pressure hydraulic oil of the hydraulic system is reduced as low-pressure hydraulic oil;Check valve, with the outlet of pilot pressure reducing valve series connection, form one-way pressure reducing circuit, for preventing quick open cylinder to place pressure oil reverse leakage after;Throttling stop valve, with the one-way pressure reducing circuit parallel, form throttling pressure maintaining circuit, for recovering high pressure after quick open cylinder to place.The utility model uses the combination of pilot pressure reducing valve, check valve and throttling stop valve, realizes the double needs of quick open cylinder quick action and high pressure compacting.Compared with traditional design, the scheme effectively solves the problems of strong vibration, oil leakage and flange or pipe clamp loosening, and ensures the reliability and durability of equipment operation.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic control circuit technology, and relates to a hydraulic control circuit for shock absorption of quick-opening cylinder in a straightening machine. Background Technology

[0002] In the steel pipe production and processing industry, the straightness of steel pipes is one of the key indicators for measuring their quality. To ensure that steel pipes meet straightness requirements, straightening machines have become indispensable electromechanical-hydraulic integrated equipment in this field. The main function of a straightening machine is to correct steel pipes with curvature, thereby improving the overall quality of the steel pipes.

[0003] In actual production, steel pipes are conveyed and slide through the straightener via roller conveyors. At this time, the quick-opening cylinder of the straightener drives the pressure roller to move rapidly downwards, applying pressure to the steel pipe to achieve the straightening purpose. This process places special requirements on the performance of the quick-opening cylinder: during the rapid downward pressing phase of the pressure roller, the quick-opening cylinder's plug cavity needs to have a large hydraulic oil flow rate to ensure that the pressure roller can respond quickly and reach the designated position; after the steel pipe is clamped, the quick-opening cylinder is required to provide a large pressure to maintain sufficient straightening force and ensure the straightening effect.

[0004] However, existing technologies face numerous challenges in meeting the aforementioned process requirements. Currently, high-pressure hydraulic oil directly powers the quick-opening cylinder. During operation, the high-flow-rate hydraulic oil needs to rapidly enter the plug cavity and maintain high pressure, resulting in strong vibrations due to the high-speed flow and pressure changes of the oil within the hydraulic pipeline. This vibration not only damages the hydraulic pipeline itself but also triggers a series of chain reactions. For example, vibration can cause oil leaks at pipeline connections, leading to oil waste and environmental pollution. Furthermore, strong vibrations can loosen flanges or clamps on the pipeline, further increasing the risk of leaks and potentially causing hydraulic system malfunctions. These problems severely impact the normal operation of the straightening machine, reduce production efficiency, and increase equipment maintenance costs.

[0005] Therefore, developing a hydraulic system control technology for straightening machines that can effectively solve the above problems is of great practical significance. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a hydraulic control circuit for shock absorption of the quick-opening cylinder of a straightening machine, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A hydraulic control circuit for damping the quick-opening cylinder of a straightening machine includes:

[0009] A pilot pressure reducing valve, the inlet of which is connected to the high-pressure hydraulic oil of the hydraulic system, is used to reduce the high-pressure hydraulic oil of the hydraulic system to low-pressure hydraulic oil.

[0010] A one-way valve is connected in series with the outlet of the pilot pressure reducing valve to form a one-way pressure reducing circuit, which is used to prevent the pressure oil from leaking back after the quick-opening cylinder is in place.

[0011] A throttling shut-off valve is connected in parallel with the one-way pressure reducing circuit to form a throttling and pressure-maintaining circuit, which is used to restore high pressure after the quick-opening cylinder is in position.

[0012] Furthermore, the pilot pressure reducing valve has an oil drain circuit to reduce the high-pressure hydraulic oil in the hydraulic system to low-pressure hydraulic oil.

[0013] Furthermore, the one-way valve is a straight-through one-way valve.

[0014] Furthermore, the throttling shut-off valve is a DC throttling shut-off valve.

[0015] Furthermore, the pilot pressure reducing valve, check valve, and throttle shut-off valve are interconnected through a hydraulic connection circuit to form a complete hydraulic control circuit.

[0016] Furthermore, the hydraulic control circuit also includes a solenoid directional valve, which is used to control the flow direction of high-pressure hydraulic oil;

[0017] The unidirectional pressure reducing circuit and the throttling pressure holding circuit are combined and then connected to the electromagnetic reversing valve. The electromagnetic reversing valve is connected to the plug chamber of the quick-opening cylinder to drive the quick-opening cylinder to move with the pressure roller.

[0018] Furthermore, the electromagnetic directional valve is a three-position four-way directional valve, having oil port C, oil port A, oil port B and oil port T, and electromagnets a and b arranged at both ends of the electromagnetic directional valve.

[0019] The one-way pressure reducing circuit and the throttling pressure holding circuit are combined and connected to oil port C. Oil port A is connected to the upper part of the quick-opening cylinder plug chamber, oil port B is connected to the lower part of the quick-opening cylinder plug chamber, and oil port T is connected to the return oil pipeline or oil tank of the hydraulic system.

[0020] When the electromagnet b is energized, the high-pressure hydraulic oil passes through the one-way pressure reducing circuit and the throttling pressure holding circuit, and is connected to the oil port C. The oil port C is connected to the oil port A, so that the high-pressure hydraulic oil enters the upper part of the quick-opening cylinder plug cavity and pushes the quick-opening cylinder to move downward with the pressure roller.

[0021] Furthermore, when the electromagnet a is energized, the high-pressure hydraulic oil passes through the one-way pressure reducing circuit and the throttling pressure holding circuit, and is connected to the oil port C. The oil port C is connected to the oil port B, so that the high-pressure hydraulic oil enters the lower part of the quick-opening cylinder plug chamber and pushes the quick-opening cylinder to move upward with the pressure roller.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. This technical solution significantly improves the performance and stability of the quick-opening cylinder of the straightener through an innovative hydraulic control circuit design. The circuit employs a combination of a pilot-operated pressure reducing valve, a check valve, and a throttling valve to meet the dual requirements of rapid cylinder action and high-pressure clamping. Compared to traditional designs, this solution effectively solves problems such as strong vibration, oil leakage, and loose flanges or pipe clamps, ensuring the reliability and durability of the equipment and providing strong support for the smooth operation of the process.

[0024] 2. During the rapid cylinder opening process, the pilot pressure reducing valve reduces the high-pressure hydraulic oil to a low-pressure state, significantly lowering the system pressure and thus reducing pipeline vibration. This vibration damping design, by controlling the smooth transition of oil flow, not only protects the hydraulic system and related pipeline components and extends the service life of the equipment, but also improves operational safety and avoids potential risks caused by vibration.

[0025] 3. Once the quick-opening cylinder has reached its designated position, the throttling valve rapidly restores the pressure to the same high-pressure state as the hydraulic system, ensuring the pressure roller can stably press the workpiece and meet the requirements of the straightening process. Simultaneously, the check valve effectively prevents reverse leakage of pressurized oil, ensuring the quick-opening cylinder maintains a high-pressure state after reaching its position. This pressure-holding function further enhances the system's stability and process accuracy, providing a guarantee for efficient production.

[0026] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of a hydraulic control circuit for damping the quick-opening cylinder of a straightening machine, as shown in the embodiment.

[0029] Figure 2 This is a schematic diagram of a hydraulic control circuit for damping the quick-opening cylinder of a straightening machine in an engineering application, as described in the embodiment.

[0030] Attached reference numerals: 1-Throttle shut-off valve, 2-Pilot pressure reducing valve, 3-Check valve, 4-Quick-opening cylinder, 5-Solenoid directional valve. Detailed Implementation

[0031] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0033] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment provides a hydraulic control circuit for damping the quick-opening cylinder of a straightening machine, including a pilot pressure reducing valve 2, a one-way valve 3, and a throttle shut-off valve 1.

[0036] The inlet of the pilot pressure reducing valve 2 is connected to the high-pressure hydraulic oil P of the hydraulic system, which is used to reduce the high-pressure hydraulic oil P to low-pressure hydraulic oil P01.

[0037] The pilot pressure reducing valve 2 has a drain circuit L, which discharges excess hydraulic oil to the oil tank to achieve stable pressure reduction. The design of the drain circuit L ensures that the high-pressure hydraulic oil P can be effectively reduced, preventing pipeline vibration caused by excessive pressure.

[0038] The one-way valve 3 is connected in series with the outlet of the pilot pressure reducing valve 2 to form a one-way pressure reducing circuit. The one-way valve 3 is a straight-through one-way valve, which allows hydraulic oil to flow from the pilot pressure reducing valve 2 to the quick-opening cylinder 4 while preventing reverse flow. This structure prevents the pressure from dropping due to reverse leakage of pressure oil after the quick-opening cylinder 4 is in position, thereby ensuring the stability of the quick-opening cylinder 4.

[0039] In another embodiment, the one-way valve 3 may also be a right-angle one-way valve.

[0040] The throttling shut-off valve 1 is connected in parallel with the one-way pressure reducing circuit to form a throttling and pressure-maintaining circuit. The throttling shut-off valve 1 is a direct-flow throttling shut-off valve, and manual, electric, or pneumatic throttling shut-off valves can be selected as needed. The flow rate of high-pressure hydraulic oil P2 can be controlled by adjusting the valve opening size.

[0041] After the quick-opening cylinder 4 moves to its position, the throttle valve 1 restores the pressure of the quick-opening cylinder 4 to be consistent with the high-pressure hydraulic oil P of the hydraulic system, ensuring that the pressure roller can stably maintain the pressing state.

[0042] In another embodiment, the throttling shut-off valve 1 may also be an angle throttling shut-off valve.

[0043] The aforementioned pilot pressure reducing valve 2, check valve 3, and throttle shut-off valve 1 are interconnected through a hydraulic connection circuit to form a complete hydraulic control circuit.

[0044] The hydraulic connection circuit uses high-pressure resistant hydraulic pipelines to ensure smooth flow of hydraulic oil between components, while reducing the risk of vibration and leakage.

[0045] In this embodiment, the pressure during the movement is reduced by the pilot pressure reducing valve 2 to reduce vibration. Combined with the check valve 3 and the throttling valve 1, the high pressure is restored and maintained after the position is reached, thus achieving the dual functions of shock reduction and pressure maintenance.

[0046] Example 2

[0047] like Figure 2 As shown, this embodiment provides a configuration of a hydraulic control circuit for damping the quick-opening cylinder of a straightening machine in an engineering application, including a pilot pressure reducing valve 2, a check valve 3, a throttle shut-off valve 1, a quick-opening cylinder 4, and a solenoid directional valve 5.

[0048] Similar to Embodiment 1, the inlet of the pilot pressure reducing valve 2 is connected to the high-pressure hydraulic oil P of the hydraulic system. The high-pressure hydraulic oil P is reduced to low-pressure hydraulic oil P01 through the drain circuit L to reduce pipeline vibration when the quick-opening cylinder 4 moves.

[0049] One-way valve 3 is a straight-through one-way valve, which is connected in series with pilot pressure reducing valve 2 to form a one-way pressure reducing circuit to prevent pressure oil from leaking in the reverse direction.

[0050] The throttling shut-off valve 1 is a DC throttling shut-off valve, which is connected in parallel with the one-way pressure reducing circuit to form a throttling and pressure maintaining circuit, used to restore high pressure after the quick-opening cylinder 4 is in position.

[0051] This embodiment adds a solenoid directional valve 5 to control the flow direction of high-pressure hydraulic oil, thereby realizing the up-and-down movement of the quick-opening cylinder 4. The solenoid directional valve 5 is a three-position four-way directional valve with oil port C, oil port A, oil port B, and oil port T, and is equipped with electromagnets a and b arranged at both ends. The one-way pressure reducing circuit and the throttling pressure holding circuit are combined and connected to oil port C. Oil port A is connected to the upper part of the plug cavity of the quick-opening cylinder 4, oil port B is connected to the lower part of the plug cavity of the quick-opening cylinder 4, and oil port T is connected to the oil tank or return oil line of the hydraulic system.

[0052] The downward movement of the quick-opening cylinder: When the electromagnet b is energized, high-pressure hydraulic oil P enters port C through the one-way pressure reducing circuit and the throttling pressure holding circuit. At this time, the solenoid reversing valve 5 connects port C with port A, and the high-pressure hydraulic oil P is reduced to low-pressure hydraulic oil P01 by the pilot pressure reducing valve 2. It then flows into the upper part of the plug chamber of the quick-opening cylinder 4 through the one-way valve 3, pushing the quick-opening cylinder 4 to drive the pressure roller downward. Due to the lower pressure, pipeline vibration is significantly reduced.

[0053] When the quick-opening cylinder 4 reaches its limit position and stops, the throttle shut-off valve 1 directly introduces high-pressure hydraulic oil P into the quick-opening cylinder 4, causing its pressure to quickly return to the high-pressure state. The check valve 3 prevents high-pressure hydraulic oil from leaking from the drain circuit L, ensuring that the quick-opening cylinder 4 maintains high pressure.

[0054] The upward movement of the quick-opening cylinder: When electromagnet a is energized, high-pressure hydraulic oil P enters port C through the one-way pressure reducing circuit and the throttling pressure holding circuit. At this time, the solenoid reversing valve 5 connects port C with port B. After the high-pressure hydraulic oil P is depressurized by the pilot pressure reducing valve 2, it flows into the lower part of the plug chamber of the quick-opening cylinder 4 through the one-way valve 3, pushing the quick-opening cylinder 4 to drive the pressure roller upward. The pressure is relatively low during the movement, reducing vibration.

[0055] Once in place, the throttling valve 1 restores high pressure, and the check valve 3 prevents leakage and maintains stable pressure.

[0056] In this embodiment, the bidirectional motion control of the quick-opening cylinder 4 is achieved through the electromagnetic reversing valve 5. Combined with the functions of the pilot pressure reducing valve 2, the one-way valve 3, and the throttling shut-off valve 1, it can effectively reduce vibration and ensure the high pressure stability after the pressure roller is in place in engineering applications.

[0057] In another embodiment, other types of solenoid directional valves, such as two-position four-way directional valves, can also be used, as long as they can meet the above functions.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydraulic control circuit for damping the quick-opening cylinder of a straightening machine, characterized in that, include: A pilot pressure reducing valve, the inlet of which is connected to the high-pressure hydraulic oil of the hydraulic system, is used to reduce the high-pressure hydraulic oil of the hydraulic system to low-pressure hydraulic oil. A one-way valve is connected in series with the outlet of the pilot pressure reducing valve to form a one-way pressure reducing circuit, which is used to prevent the pressure oil from leaking back after the quick-opening cylinder is in place. A throttling shut-off valve is connected in parallel with the one-way pressure reducing circuit to form a throttling and pressure-maintaining circuit, which is used to restore high pressure after the quick-opening cylinder is in position.

2. The hydraulic control circuit according to claim 1, characterized in that, The pilot pressure reducing valve has a drain circuit to reduce the high-pressure hydraulic oil in the hydraulic system to low-pressure hydraulic oil.

3. The hydraulic control circuit according to claim 1, characterized in that, The check valve is a straight-through check valve.

4. The hydraulic control circuit according to claim 1, characterized in that, The throttling valve is a DC throttling valve.

5. The hydraulic control circuit according to claim 1, characterized in that, The pilot pressure reducing valve, check valve, and throttle shut-off valve are interconnected through a hydraulic connection circuit to form a complete hydraulic control circuit.

6. The hydraulic control circuit according to claim 1, characterized in that, The hydraulic control circuit also includes a solenoid directional valve, which is used to control the flow direction of high-pressure hydraulic oil. The unidirectional pressure reducing circuit and the throttling pressure holding circuit are combined and then connected to the electromagnetic reversing valve. The electromagnetic reversing valve is connected to the plug chamber of the quick-opening cylinder to drive the quick-opening cylinder to move with the pressure roller.

7. The hydraulic control circuit according to claim 6, characterized in that, The electromagnetic directional valve is a three-position four-way directional valve, having oil port C, oil port A, oil port B and oil port T, and electromagnets a and b arranged at both ends of the electromagnetic directional valve. The one-way pressure reducing circuit and the throttling pressure holding circuit are connected to port C after being combined. Port A is connected to the upper part of the quick-opening cylinder plug chamber, port B is connected to the lower part of the quick-opening cylinder plug chamber, and port T is connected to the return oil line or oil tank of the hydraulic system. When the electromagnet b is energized, the high-pressure hydraulic oil passes through the one-way pressure reducing circuit and the throttling pressure holding circuit, and is connected to the oil port C. The oil port C is connected to the oil port A, so that the high-pressure hydraulic oil enters the upper part of the quick-opening cylinder plug cavity and pushes the quick-opening cylinder to move downward with the pressure roller.

8. The hydraulic control circuit according to claim 7, characterized in that, When the electromagnet a is energized, high-pressure hydraulic oil passes through the one-way pressure reducing circuit and the throttling pressure holding circuit, and is connected to port C. Port C is connected to port B, so that the high-pressure hydraulic oil enters the lower part of the quick-opening cylinder plug chamber, pushing the quick-opening cylinder to move upward with the pressure roller.

Images