Multi-path ground locking pressure maintaining control system and device

Abstract

The utility model discloses a multipath ground locking pressure maintaining control system, which is provided with a flow supply end and a backflow end, and comprises at least two ground locking jacking devices which are arranged in parallel, and the input ends of the ground locking jacking devices are connected with the flow supply end; one end of the control switch is in one-way communication with the output end of the ground locking jacking device, and the other end of the control switch is connected with the backflow end and used for connecting and disconnecting the backflow end; the pressure of the flow supply end passes through the ground locking jacking device, and the control switch blocks the pressure from passing through the backflow end, so that the ground locking jacking device is in a jacking supporting and pressure maintaining state. The system is beneficial to effective pressure maintaining during long-term use, the problem of platform inclination caused by unbalance loading can be avoided, the modularization degree of the system is high, combined application of various ground locking jacking devices can be achieved, operation is easy, and single-person control operation is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic jacking support control, in particular to a multi-way ground locking pressure maintaining control system and a device. Background Art

[0002] The hydraulic multi-way ground-locking jacking system is mostly used in heavy object support mechanisms, directly or indirectly supporting heavy objects with the ground force, and is of great significance in heavy object loading and unloading transportation and long-term jacking support occasions. In the existing device, the control of the multi-way jacking cylinder in the ground-locking jacking system is mainly based on independent control to ensure that there is less oil leakage between the cylinders to avoid causing the mechanism supported by the multi-way cylinder to tilt (commonly known as the soft leg phenomenon). For example, when the support mechanism maintains the support of the heavy object for a long time, there will be an overload, or the support mechanism is under pressure. The platform is unevenly stressed, resulting in the change of the jacking cylinder stroke, causing the force platform of the support mechanism to deviate and tilt. However, the existing technology of the ground-locking jacking system adopts an independent control method, which has the following shortcomings: the use of independent hydraulic control methods for each jacking cylinder is not conducive to the integration of the system, and the control elements and their matching oil circuits are increased, thereby increasing the complexity of the control system, and the cost will be higher; on the other hand, the manual emergency device in an emergency is not easy to operate, and multiple people may be required to operate each jacking cylinder together. Therefore, the existing technology of the ground-locking jacking system has the problem of being not conducive to integration and efficiency. Utility Model Content

[0003] The multi-path ground-locking pressure-maintaining control system and device of the utility model can effectively solve the problem that the ground-locking jacking system in the above-mentioned prior art is not conducive to integration and efficiency.

[0004] According to one aspect of the utility model, a multi-way ground-locking pressure-maintaining control system is provided, which has a flow supply end and a return end, and includes:

[0005] At least two ground-locking lifting devices, the ground-locking lifting devices are arranged in parallel with each other, and the input end of the ground-locking lifting device is connected to the flow supply end;

[0006] A control switch, one end of which is unidirectionally connected to the output end of the ground-locking lifting device, and the other end of which is connected to the return end, for connecting and blocking the return end;

[0007] The pressure at the supply end passes through the ground-locking lifting device, and the control switch blocks the pressure from passing through the return end, so that the ground-locking lifting device is in a state of lifting support and maintaining pressure.

[0008] In some embodiments, the ground-locking lifting device comprises:

[0009] An actuator having a driving rod, through which a first cavity and a second cavity are formed inside the actuator;

[0010] A first one-way valve connected between the fluid supply end and the first cavity;

[0011] a second one-way valve connected between the control switch and the first chamber;

[0012] The control switch is connected to the return end, so that the pressure of the supply end passes through the first one-way valve, the first cavity and the second one-way valve in sequence and is output to the return end, so that the drive rod retracts. Thus, the first one-way valve is used to input the oil pressure to the first cavity in one direction, the second one-way valve is used to block the oil pressure from flowing back to the first cavity, and the actuator is used to execute the driving lifting and supporting action.

[0013] In some embodiments, a connecting pipeline is connected between the first cavity and the second cavity, and when the driving rod retracts, the pressure at the fluid supply end enters the second cavity through the first one-way valve. Thus, the connecting pipeline is used to balance the pressure in the first cavity and the second cavity.

[0014] In some embodiments, the actuator drives the driving rod on one side, and the second cavity is connected to the external air pressure to balance the pressure in the second cavity.

[0015] In some embodiments, an elastic member is disposed in the second cavity, the elastic member abuts against the driving rod, and when the driving rod is subjected to pressure from the fluid supply end, the elastic member generates a force for the driving rod to retract.

[0016] In some embodiments, the cross-sectional area of ​​the first cavity is S1, the cross-sectional area of ​​the second cavity is S2, the elastic force of the elastic member is F, and the pressure provided by the fluid supply end is P, wherein when the ground-locking lifting device is in the lifting support and pressure-maintaining state, S1·P>S2·P+F is satisfied. Thus, when in the lifting support state, the condition S1·P>S2·P+F needs to be satisfied to ensure that the driving rod can extend.

[0017] In some embodiments, the control switch includes a manual control valve and an electromagnetic control valve, and the manual control valve is arranged in parallel with the electric control valve. Thus, any valve body can be controlled to make the oil pressure return to the return end, usually using the electromagnetic control valve for control, and in an emergency, the manual control valve can be used for control.

[0018] In some embodiments, a third one-way valve is connected between the fluid supply end and the input end of the ground-locking lifting device, so that the pressure of the fluid supply end is output in one direction. Thus, the third one-way valve is used to prevent oil pressure from flowing back, further ensuring the pressure-maintaining state of the ground-locking lifting device.

[0019] In some embodiments, an accumulator is connected between the third one-way valve and the input end of the ground-locking lifting device to supplement the pressure of the ground-locking lifting device. Thus, the accumulator is used to compensate for slight leakage of the ground-locking lifting device under long-term pressure maintenance or travel deviation under the influence of temperature environment.

[0020] On the other hand, the utility model provides a multi-way ground lock pressure maintenance control device, including a support mechanism and the above-mentioned multi-way ground lock pressure maintenance control system, and the ground lock lifting device is connected to the support mechanism. Therefore, the device can also realize the function of the multi-way ground lock pressure maintenance control system, the support mechanism is used to support heavy objects and can be used as a supporting platform, and the multi-way ground lock pressure maintenance control system is used to provide power.

[0021] Compared with the prior art, the multi-path ground-locking pressure-maintaining control system of the utility model has the following beneficial effects:

[0022] The present application sets the ground-locking and lifting devices used for the operation in parallel with each other, avoiding the method of individual control, which is beneficial to the integrated control of the system, and the control switch is used to connect and block the return flow end. When the pressure at the supply end enters the ground-locking and lifting device, the ground-locking and lifting device is in a state of lifting support, and the control switch blocks the pressure output of the return flow end, so that the ground-locking and lifting device is in a state of maintaining pressure, and the output end of the ground-locking and lifting device is unidirectionally connected to the control switch, and the system pipeline will not have the phenomenon of back pressure to the ground-locking and lifting device. Therefore, the pressure of the pipeline between the control switch and the ground-locking and lifting device is always in the state of the highest pressure, which is beneficial to effective pressure maintenance during long-term use, and can avoid the problem of platform tilting caused by unbalanced load. The system has a high degree of modularity, and can realize the combined application of various numbers of ground-locking and lifting devices. The operation is simple, which is beneficial to single-person control operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the principle diagram of the multi-way ground-locking pressure-maintaining control system of the utility model;

[0024] Figure 2 This is a schematic diagram of the ground-locking lifting device in the utility model;

[0025] Figure 3 It is a schematic diagram of the hydraulic flow direction of the multi-way ground-locking pressure-maintaining control system of the utility model in the jacking support state;

[0026] Figure 4 It is a schematic diagram of the hydraulic flow direction of the retracted state of the driving rod in the multi-way ground-locking pressure-maintaining control system of the utility model.

[0027] In the figure: 1-ground locking lifting device, 1a-first ground locking lifting device, 1b-second ground locking lifting device, 1c-third ground locking lifting device, 1d-fourth ground locking lifting device, 11-hydraulic cylinder, 12-driving rod, 13-first cavity, 14-second cavity, 15-elastic member, 16-first one-way valve, 17-second one-way valve, 18-connecting pipeline, 3-third one-way valve, 4-accumulator, 5-manual control valve, 6-electromagnetic control valve. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] The utility model relates to a multi-way ground-locking pressure-maintaining control system and device, which is suitable for providing lifting support force for a supporting platform, and can effectively solve the problem of eccentric load tilting caused by uneven load. It can generally be used in conjunction with an electronic control system, and the pressure medium provided can be hydraulic oil to realize an electronically controlled hydraulic drive control method.

[0031] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0032] Figure 1 The multi-way ground locking and pressure maintaining control system according to an embodiment of the utility model is schematically shown. Figure 1 As shown, the multi-way ground locking pressure-maintaining control system includes a ground locking lifting device 1 and a control switch. The end of the ground locking lifting device 1 pointing in the extension direction is the lower side, and the end of the ground locking lifting device 1 pointing in the retraction direction is the lower side. The multi-way ground locking pressure-maintaining control system has a flow supply end and a return end. The flow supply end is the high-pressure input end (P port) of the hydraulic oil, and the return end is the low-pressure output end (T port) of the hydraulic oil, which generally flows back to the oil tank.

[0033] like Figure 1 , Figure 2 As shown, at least two ground-locking lifting devices 1 are provided, and multiple ground-locking lifting devices 1 may be provided. In this embodiment, four ground-locking lifting devices 1 are taken as an example, namely a first ground-locking lifting device 1a, a second ground-locking lifting device 1b, a third ground-locking lifting device 1c and a fourth ground-locking lifting device 1d, which are arranged in parallel with each other. When in use, the supporting positions of the ground-locking lifting devices 1 can be evenly arranged so that they can be evenly supported by force. The ground-locking lifting device 1 has an input end and an output end, wherein the input end is connected to the flow supply end P port. The ground-locking lifting device 1 comprises an actuator, a first one-way valve 16 and a second one-way valve 17. The actuator is preferably a hydraulic cylinder 11, wherein the hydraulic cylinder 11 has a driving rod 12, wherein the driving rod 12 is preferably a piston rod, and the driving rod 12 has a driving member at one end close to the inside of the hydraulic cylinder 11, wherein the driving member is a piston. The driving rod 12 forms a first cavity 13 and a second cavity 14 inside the hydraulic cylinder 11, wherein the first cavity 13 is a rodless cavity, and the second cavity 14 is a rod cavity, and the cross-sectional area of ​​the first cavity 13 (circular with equal radius) is greater than the cross-sectional area of ​​the second cavity 14 (circular with equal radius). The driving rod 12 can be telescopically moved in the hydraulic cylinder 11. One end of the driving rod 12 outside the hydraulic cylinder 11 is generally connected to other supporting platforms, such as in contact and abutment. The ground-locking jacking device 1 has a jacking support state, that is, the state when the driving rod 12 is driven to extend (downward). The ground-locking jacking device 1 also has a retracted state, that is, the state when the driving rod 12 is retracted (upward).

[0034] There is also an elastic member 15 in the second cavity 14. The elastic member 15 is preferably a spring. One end of the elastic member 15 abuts against the bottom wall of the hydraulic cylinder 11, and the other end of the elastic member 15 abuts against the drive rod 12, specifically, abuts against the piston of the drive rod 12. When the oil pressure at the flow supply end P enters the hydraulic cylinder 11, the drive rod 12 extends downward under the pressure and acts on the elastic member 15. The elastic member 15 generates a force that causes the drive rod 12 to retract, so that the drive rod 12 has a tendency to retract. On the other hand, the elastic member 15 also has a buffering effect to avoid the problem of excessive extension of the drive rod 12 due to excessive oil pressure, which may cause damage. The elastic force of the elastic member 15 and the pressure of the hydraulic oil act on the drive rod 12 together.

[0035] The first one-way valve 16 and the second one-way valve 17 are preferably hydraulic one-way valves. The first one-way valve 16 is connected between the flow supply end P port and the first cavity 13, so that the hydraulic pressure of the flow supply end P port can flow into the first cavity 13 in one direction. The second one-way valve 17 is connected between the control switch and the first cavity 13, so that the hydraulic pressure in the first cavity 13 can flow out to the control switch in one direction. Among them, a connecting line 18 is connected between the first cavity 13 and the second cavity 14. The connecting line 18 is a hydraulic oil line connecting the first cavity 13 and the second cavity 14. One end of the connecting line 18 is connected between the first cavity 13 and the first one-way valve 16, so that the oil pressure of the flow supply end P port can enter the second cavity 14 through the first one-way valve 16, for example, Figure 4 As shown, the arrow indicates the direction of oil pressure flow. When the drive rod 12 retracts, the volume of the first cavity 13 gradually decreases, and the volume of the second cavity 14 gradually increases, so that the oil pressure portion of the flow supply end P enters the second cavity 14 through the connecting pipe 18. When the drive rod 12 is extended to perform a lifting support action, the volume of the second cavity 14 gradually decreases, and the volume of the first cavity 13 gradually increases, and part of the oil pressure of the second cavity 14 enters the first cavity 13 through the connecting pipe 18.

[0036] The control switch is connected between the output end of the ground-locking jacking device 1 and the return end T port, and the control switch is unidirectionally connected to the output end of the ground-locking jacking device 1, so that the oil pressure at the output end of the ground-locking jacking device 1 can be unidirectionally output to the control switch and then enter the return end T port. The control switch is used to connect and block the oil pressure output to the return end T port, and the ground-locking jacking device 1 is controlled by the control switch to achieve a jacking support state and a retracted state. The control switch includes a manual control valve 5 and an electromagnetic control valve 6. The manual control valve 5 is used by the operator to manually control the conduction state between the locking jacking device 1 and the return end T port. A manual shut-off valve or a reversing valve can be selected. The manual control valve 5 is in a normally closed state. The electromagnetic control valve 6 is connected through the control of the electronic control system. The electromagnetic control valve 6 is preferably an electromagnetic ball valve. The electromagnetic control valve 6 is in a closed state when the power is off, and in an open state when the power is on. The manual control valve 5 is arranged in parallel with the electric control valve. When the electromagnetic control valve 6 is paralyzed and cannot operate, or in an emergency, the manual control valve 5 can be opened to allow oil pressure to enter the return end T port.

[0037] Furthermore, a third one-way valve 3 is provided between the flow supply end P port and the input end of the ground locking jacking device 1. The third one-way valve 3 is preferably a hydraulic one-way valve. The oil pressure at the flow supply end P port enters the ground locking jacking device 1 in one direction through the third one-way valve 3 to avoid oil return.

[0038] Furthermore, an accumulator 4 is provided between the third one-way valve 3 and the input end of the ground-locking jacking device 1, so that the oil pressure at the flow supply end P port can be ensured to enter the accumulator 4 in one direction. In the event of slight leakage of the accumulator 4 or a sharp drop in temperature, and the stroke of each hydraulic cylinder 11 may be reduced, the accumulator 4 can replenish the oil source for the ground-locking jacking device 1 for compensatory adjustment.

[0039] Here’s how it works:

[0040] like Figure 3 As shown, the pressure of the hydraulic oil at the flow supply end P port enters the first ground locking lifting device 1a, the second ground locking lifting device 1b, the third ground locking lifting device 1c and the fourth ground locking lifting device 1d respectively through the third one-way valve 3, and the oil pressure enters each first cavity 13 after passing through each first one-way valve 16. The electromagnetic control valve 6 is de-energized and in a closed state. The oil pressure causes the volume of the first cavity 13 to gradually increase, and the volume of the second cavity 14 to gradually decrease. The driving rod 12 extends, and the oil pressure part of the second cavity 14 enters the first cavity 13 through the connecting pipe 18. The driving rod 12 of each hydraulic cylinder 11 supports the platform to rise to the required position. When the electromagnetic control valve 6 blocks the pressure from entering the return port T and under the action of the second one-way valve 17, the hydraulic oil in the pipeline between the second one-way valve 17 and the electromagnetic control valve 6 does not flow and is in a blocked state. The pipeline between the second one-way valve 17 and the electromagnetic control valve 6 is always kept at the highest pressure, and the second one-way valve 17 is in a state of blocking the return oil to the first cavity 13 under the action of high pressure. Even if there is a support overload, the entire system can be in a pressure-maintaining state, which can effectively avoid the oil cross-talk between the hydraulic cylinders 11. The drive rod 12 can maintain the same extension stroke for a long time, so that the ground-locking jacking device 1 is in a jacking support state. If there is a slight leakage in the system under super-long pressure maintenance or a sharp drop in temperature, the stroke of each hydraulic cylinder 11 may be reduced, and the accumulator 4 can provide a supplementary oil source for compensatory adjustment.

[0041] Specifically, the cross-sectional area of ​​the first cavity 13 is marked as S1, the cross-sectional area of ​​the second cavity 14 is marked as S2, the elastic force of the elastic member 15 is marked as F, and the pressure provided by the flow supply end is marked as P, wherein when the ground locking jacking device 1 is in a state of jacking support and pressure maintenance, S1·P>S2·P+F is satisfied, ensuring that the driving rod 12 can be extended to the required stroke.

[0042] like Figure 4As shown, after use, the driving rod 12 of each hydraulic cylinder 11 needs to be retracted. After opening either the manual control valve 5 or the electric control valve, the control switch is connected to the return port T, so that the oil pressure of the lock ground lifting device 1 can pass through the control switch and be output to the return port T. Specifically, the oil pressure of the supply port P passes through each first one-way valve 16, the first cavity 13, and the second one-way valve 17 in sequence and is output to the return port T. Under the action of the elastic member 15, the volume of the first cavity 13 gradually decreases, and the volume of the second cavity 14 gradually increases, and the driving rod 12 performs a retraction action. During this process, the oil pressure part input from the supply port P and passing through the first one-way valve 16 enters the second cavity 14 through the connecting pipe 18 to supplement the oil pressure in the second cavity 14.

[0043] In other embodiments, the connecting pipe 18 can be omitted. For example, when the hydraulic cylinder 11 adopts a single-sided hydraulic drive, only the first cavity 13 is filled with hydraulic oil, and the second cavity 14 is connected to the external air pressure. When the driving rod 12 is extended and retracted, the condition S1xP>S2xP+F does not need to be satisfied. When the volume of the second cavity 14 increases or decreases, it can be connected to the atmosphere to balance the pressure in the second cavity 14.

[0044] The present application also provides a multi-way ground locking and pressure maintaining control device, including a support mechanism and the multi-way ground locking and pressure maintaining control system in the above-mentioned embodiment. The support mechanism (not shown) has a support platform that can generally place and support heavy objects. The ground locking and lifting device 1 is connected to the support mechanism. For example, the end of the driving rod 12 can be in contact with the support mechanism or can be detachably connected. Each ground locking and lifting device 1 is evenly distributed in the support mechanism to balance the supporting force. The multi-way ground locking and pressure maintaining control system can avoid the problem of uneven load on the support mechanism causing offset and tilt.

[0045] It can be seen that the multi-channel ground-locking and pressure-maintaining control system of the present application can increase the number of ground-locking and lifting devices 1 according to actual needs, avoid individual control methods, and can be operated by one person in an emergency. It has low cost and high modularity. The number of ground-locking and lifting devices 1 can be combined for application, which is conducive to the integration of the system and the simplification of the control method.

[0046] The above description is only a preferred embodiment of the present invention. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. This does not limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A multi-way ground-locking pressure-maintaining control system, having a flow supply end and a return end, characterized in that: include: At least two ground-locking lifting devices, the ground-locking lifting devices are arranged in parallel with each other, and the input end of the ground-locking lifting device is connected to the flow supply end; A control switch, one end of which is unidirectionally connected to the output end of the ground-locking lifting device, and the other end of which is connected to the return end, for connecting and blocking the return end; The pressure at the supply end passes through the ground-locking lifting device, and the control switch blocks the pressure from passing through the return end, so that the ground-locking lifting device is in a state of lifting support and maintaining pressure.

2. The multi-way ground-locking pressure-maintaining control system according to claim 1 is characterized in that: The ground-locking lifting device comprises: An actuator having a driving rod, through which a first cavity and a second cavity are formed inside the actuator; A first one-way valve connected between the fluid supply end and the first cavity; a second one-way valve connected between the control switch and the first chamber; The control switch is connected to the return end, so that the pressure of the supply end passes through the first one-way valve, the first cavity and the second one-way valve in sequence and is output to the return end, causing the drive rod to retract.

3. The multi-way ground-locking pressure-maintaining control system according to claim 2 is characterized in that: A communicating pipeline is connected between the first cavity and the second cavity. When the driving rod retracts, the pressure at the fluid supply end enters the second cavity through the first one-way valve.

4. The multi-way ground-locking pressure-maintaining control system according to claim 2, characterized in that: The actuator drives the driving rod on one side, and the second cavity is connected to the external air pressure to balance the pressure in the second cavity.

5. The multi-way ground-locking pressure-maintaining control system according to claim 2, characterized in that: An elastic member is disposed in the second cavity, and the elastic member abuts against the driving rod. When the driving rod is subjected to pressure from the fluid supply end, the elastic member generates a force to cause the driving rod to retract.

6. The multi-way ground-locking pressure-maintaining control system according to claim 5, characterized in that: The cross-sectional area of ​​the first cavity is S1, the cross-sectional area of ​​the second cavity is S2, the elastic force of the elastic member is F, and the pressure provided by the flow supply end is P, wherein when the ground-locking lifting device is in a state of lifting support and maintaining pressure, S1·P>S2·P+F is satisfied.

7. The multi-way ground-locking pressure-maintaining control system according to claim 1, characterized in that: The control switch comprises a manual control valve and an electromagnetic control valve, and the manual control valve and the electromagnetic control valve are arranged in parallel.

8. The multi-way ground-locking pressure-maintaining control system according to claim 1, characterized in that: A third one-way valve is connected between the flow supply end and the input end of the ground-locking lifting device, so that the pressure of the flow supply end is output in one direction.

9. The multi-way ground-locking pressure-maintaining control system according to claim 8, characterized in that: An accumulator is connected between the third one-way valve and the input end of the ground-locking lifting device to supplement the pressure of the ground-locking lifting device.

10. A multi-way ground-locking pressure-maintaining control device, characterized in that: It comprises a supporting mechanism and a multi-way ground-locking pressure-maintaining control system according to any one of claims 1 to 9, wherein the ground-locking lifting device is connected to the supporting mechanism.

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