Hydraulic drive control system applied to multi-stage lifting device

Abstract

The utility model belongs to the technical field of hydraulic control, and particularly relates to a hydraulic drive control system applied to a multi-stage lifting device, which comprises a lifting platform, a multi-stage lifting oil cylinder group, a control valve group, a hydraulic pipeline, a power station and a controller, the multi-stage lifting oil cylinder set is composed of a plurality of multi-stage piston cylinders arranged in parallel. The multi-stage lifting oil cylinder group is used for driving the lifting platform to ascend and descend; each stage of piston cylinder of the multi-stage piston cylinder is provided with an oil inlet and an oil outlet; the control valve group is arranged at the bottom of the multi-stage lifting oil cylinder group and is connected with the power station through a hydraulic pipeline; the hydraulic drive control system carries out comprehensive operation and control through the controller. According to the system, the minimum closed-loop control units are formed by the servo proportional valves and the multi-stage piston cylinders, and the multiple closed-loop control units act together, so that accurate position control over the multi-stage lifting device is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic control, and in particular relates to a hydraulic drive control system applied to a multi-stage lifting device. Background Art

[0002] For the hydraulic drive control of multi-stage lifting devices, the conventional solution uses a hydraulic system consisting of an ordinary reversing valve and a multi-stage plunger cylinder for drive control. This type of hydraulic system can only achieve simple lifting action drive control, while descent needs to rely on load gravity. The lifting speed and position cannot be accurately controlled. When multiple cylinders work in parallel, real-time synchronous control cannot be achieved, and the lifting device is prone to getting stuck. Utility Model Content

[0003] The utility model provides a hydraulic drive control system applied to a multi-stage lifting device. The system adopts a combination mode of a servo proportional valve and a multi-stage piston cylinder. A control loop composed of each group of servo proportional valves independently controls a multi-stage piston cylinder, and then multiple groups of servo proportional valves + multi-stage piston cylinders are connected in parallel to jointly drive the multi-stage lifting device. The controller performs comprehensive closed-loop operation control to achieve precise position control of the multi-stage lifting device.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A hydraulic drive control system applied to a multi-stage lifting device, comprising a lifting platform, a multi-stage lifting cylinder group, a control valve group, a hydraulic pipeline, a power station and a controller; the multi-stage lifting cylinder group is composed of a plurality of multi-stage piston cylinders arranged in parallel; the multi-stage lifting cylinder group is used to drive the lifting platform to rise and fall; each stage of the multi-stage piston cylinder is provided with an oil inlet and an oil outlet; the power station comprises an oil tank and a pump unit; the control valve group is arranged at the bottom of the multi-stage lifting cylinder group and is connected to the power station through the hydraulic pipeline; the hydraulic drive control system performs comprehensive calculations and control through the controller.

[0006] Furthermore, the oil tank provides working oil for the multi-stage lifting cylinder group, the control valve group and the hydraulic pipeline; the pump unit includes a motor and a constant pressure pump, which is used to provide a pressure oil source for the multi-stage piston cylinder.

[0007] Furthermore, the control valve group includes an electromagnetic overflow valve, a one-way valve, a high-pressure oil filter, a pressure compensator, a servo proportional valve, a counterbalance valve, an electromagnetic ball valve, a pressure sensor, a high-pressure ball valve and an explosion-proof valve; wherein the high-pressure filter is arranged at the oil outlet of the pump unit; the servo proportional valve has a built-in amplifier, and the controller controls the real-time high-frequency response of the servo proportional valve by collecting the signal of the displacement sensor on the multi-stage piston cylinder;

[0008] The pressure compensator is used to adjust and stabilize the pressure difference on both sides of the servo proportional valve;

[0009] The high-pressure ball valve is arranged on the oil inlet pipeline of the multi-stage piston cylinder;

[0010] The electromagnetic ball valve and the explosion-proof valve are cooperatively arranged on the cylinder body of the multi-stage piston cylinder.

[0011] Furthermore, a high-pressure rubber hose is provided on the oil outlet pipeline of the multi-stage piston cylinder to buffer pressure shock.

[0012] Furthermore, the multi-stage piston cylinders are evenly distributed below the lifting platform, and the multi-stage piston cylinders are fixed on a cylinder base.

[0013] Furthermore, two sealing rings are arranged inside the multi-stage piston cylinder.

[0014] The beneficial effects of the utility model are as follows:

[0015] (1) This hydraulic drive control system adopts the design concept of a multi-stage piston cylinder, which solves the problem of uncontrollable extension and retraction of the piston cylinder; at the same time, the hydraulic drive control system adopts a servo proportional valve as the main control element, and a minimum closed-loop control unit is composed of a servo proportional valve + a multi-stage piston cylinder. Multiple closed-loop control units work together to achieve precise position control of the multi-stage lifting device.

[0016] (2) This hydraulic drive control system combines the requirements of precise position control and sets up multiple pressure maintenance measures in the hydraulic circuit, including a counterbalance valve, an electromagnetic ball valve, an explosion-proof valve, etc. In addition, the multi-stage piston cylinder structure is optimized and double sealing rings are set. The leakage is reduced by two orders of magnitude, ensuring the position maintenance function under precise position control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the hydraulic drive control system of the utility model;

[0018] Figure 2 This is a schematic diagram of the principle of the first-stage oil cylinder extending and rising in the utility model;

[0019] Figure 3 This is a schematic diagram of the extension and rising principle of the second-stage oil cylinder of the utility model;

[0020] Figure 4 This is a schematic diagram of the retraction and descent principle of the second-stage oil cylinder of the utility model;

[0021] Figure 5 This is a schematic diagram of the principle of retracting and descending the first-stage oil cylinder of the utility model;

[0022] In the figure: 1. Oil tank; 2. Pump unit; 3. Solenoid overflow valve; 4. Check valve; 5. High-pressure oil filter; 6. Pressure compensator; 7. Servo proportional valve; 8. Counterbalance valve; 9-1. Solenoid ball valve one; 9-2. Solenoid ball valve two; 10. Pressure sensor; 11. High-pressure ball valve; 12. High-pressure hose; 13-1. Solenoid ball valve three; 13-2. Solenoid ball valve four; 14. Explosion-proof valve; 15. Multi-stage piston cylinder; 16. Lifting platform. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the drawings required for the implementation are briefly introduced below. Obviously, the drawings described below are only some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. The implementation methods cannot be described one by one here, but the implementation methods of the present invention are not therefore limited to the following implementation methods.

[0025] It should be pointed out that the front end, front side and front part mentioned in the following embodiment are all the forward direction of the drilling, anchoring and protecting machine, and the rear is relative to the forward direction. Similarly, up, down, left and right are all referred to the forward direction of the drilling, anchoring and protecting machine, which will not be repeated below.

[0026] Embodiment: A hydraulic drive control system for a multi-stage lifting device, the structure of which is shown in FIG. Figure 1 As shown, it includes a lifting platform 16, a multi-stage lifting cylinder group, a control valve group, a hydraulic pipeline, a power station and a controller; the multi-stage lifting cylinder group is composed of a number of multi-stage piston cylinders 15 arranged in parallel (multi-stage refers to two or more stages; in this embodiment, a two-stage piston cylinder is taken as an example); the multi-stage lifting cylinder group is used to drive the lifting platform 16 to rise and fall; each stage of the multi-stage piston cylinder 15 is provided with an oil inlet and an oil outlet, which can realize individual precise control, ensuring that each stage can cooperate with the servo proportional valve 7 to complete closed-loop control; the power station includes an oil tank 1 and a pump unit 2; the control valve group is arranged at the bottom of the multi-stage lifting cylinder group and is connected to the power station through the hydraulic pipeline; the hydraulic drive control system performs comprehensive calculations and controls through the controller.

[0027] Specifically, in this embodiment, the oil tank 1 is a large-volume oil tank that meets the oil needs of the cylinder, control valve group, and pipeline; the oil tank 1 is mainly composed of hydraulic accessories such as a liquid level sensor, a temperature sensor, high and low pressure filters, and a heater, and is also equipped with a cooling device; the oil tank 1 is the main storage device for the system transmission medium, the hydraulic oil level is monitored in real time by a liquid level controller, the oil temperature is monitored in real time by a temperature sensor, and the opening and closing of the cooling device are controlled.

[0028] The pump unit 2 is mainly composed of a motor and a constant pressure pump, which are connected and fixed by a pump sleeve in the middle and transmit power through a coupling. It mainly provides a pressure oil source for the four chambers of the multi-stage piston cylinder 15 to realize its lifting action.

[0029] The electromagnetic relief valve 3 is used to set the maximum working pressure of the system and plays a safety protection role.

[0030] One-way valve 4 prevents oil from flowing back and maintains system pressure.

[0031] The high-pressure oil filter 5 is arranged on the oil outlet pipeline of the constant pressure pump to ensure the cleanliness of the high-pressure oil output by the pump to other hydraulic valve groups.

[0032] The pressure compensator 6 makes the pressure difference on both sides of the servo proportional valve 7 adjustable, thereby improving the control performance of the servo proportional valve 7.

[0033] The servo proportional valve 7 has a built-in amplifier. The controller collects the signal of the displacement sensor on the multi-stage piston cylinder 15 to control the real-time high-frequency response of the servo proportional valve 7, thereby achieving closed-loop control and realizing precise speed control, position control and force control of the rise and fall of the multi-stage piston cylinder 15.

[0034] The counterbalance valve 8 sets parameters according to the load to ensure smooth system control when the load decreases.

[0035] The electromagnetic ball valve 1 9-1 and the electromagnetic ball valve 2 9-2 are used to control the oil circuit switching, realize the controllable switching between the first and second stages of the multi-stage piston cylinder 15, prevent the cylinder from being connected, and play a role in maintaining pressure.

[0036] The pressure sensor 10 displays and detects the oil circuit pressure in real time and realizes remote alarm when an abnormality occurs.

[0037] The high-pressure ball valve 11 is arranged on the oil inlet pipeline of the multi-stage piston cylinder 15 and is reserved for pipeline flushing, system detection, abnormality handling, etc.

[0038] The high-pressure rubber hose 12 is arranged on the oil outlet pipeline of the multi-stage piston cylinder 15, connected to the oil cylinder, and cooperates with the displacement generated by the swing of the oil cylinder, and at the same time plays a role in buffering pressure shock.

[0039] The electromagnetic ball valve three 13-1 and the electromagnetic ball valve four 13-2 are arranged on the cylinder body of the multi-stage piston cylinder 15 to control the on-off of the oil circuit, realize the rise and fall of the multi-stage piston cylinder 15, and play a role in maintaining pressure when the cylinder is stationary; at the same time, they cooperate with the explosion-proof valve 14 to achieve double protection to prevent the pipeline from rupturing and causing the cylinder to lose control.

[0040] The explosion-proof valve 14 is arranged on the cylinder body of the multi-stage piston cylinder 15 and cooperates with the electromagnetic ball valve to achieve double protection to prevent the oil cylinder from losing control due to pipeline rupture.

[0041] The working principle of the utility model is:

[0042] The pump unit 2 provides a high-pressure oil source, and the controller cooperates with the servo proportional valve 7 to perform closed-loop control, and then controls the oil circuit switching through the electromagnetic ball valve 1 9-1 and the electromagnetic ball valve 2 9-2, so as to realize the controllable switching between the first and second stages of the lifting cylinder, prevent the cylinder chain phenomenon, and play a role in maintaining pressure. The specific operation is as follows: When the controller gives a signal, the servo proportional valve 7 works in the right position, and the electromagnetic ball valve 3 13-1 is energized. At this time, the high-pressure oil source provided by the pump unit 2 passes through the one-way valve 4, the high-pressure oil filter 5, the pressure compensator 6, the servo proportional valve 7, the counter-valve 8-1, the electromagnetic ball valve 1 9-1, the electromagnetic ball valve 3 13-1 and the pipeline, and enters the lower chamber of the first cylinder of the multi-stage piston cylinder 15, so that the first cylinder has a tendency to extend upward, and the hydraulic oil in the upper chamber of the first cylinder passes through the electromagnetic ball valve 2 9-2, the counter-valve 8-2, the servo proportional valve 7 and the pipeline back to the oil tank 1. At this time, the first cylinder extends and rises (such as Figure 2 As shown); when the first-stage cylinder extends and rises to the right position, the displacement sensor detecting the multi-stage piston cylinder 15 transmits the displacement signal to the controller, and the controller gives a signal, the servo proportional valve 7 works in the right position, the electromagnetic ball valve 1 9-1, the electromagnetic ball valve 2 9-2, and the electromagnetic ball valve 4 13-2 are energized, and the high-pressure oil source provided by the pump unit 2 passes through the one-way valve 4, the high-pressure oil filter 5, the pressure compensator 6, the servo proportional valve 7, the counter-valve 8-1, the electromagnetic ball valve 1 9-1, the electromagnetic ball valve 4 13-2 and the pipeline, and enters the lower chamber of the second-stage cylinder, so that the second-stage cylinder has a tendency to extend upward, and the hydraulic oil in the upper chamber of the second-stage cylinder passes through the electromagnetic ball valve 2 9-2, the counter-valve 8-2, the servo proportional valve 7 and the pipeline back to the oil tank 1, and the second-stage cylinder extends and rises (as shown). Figure 3As shown), after the secondary cylinder extends and rises to the specified position, the multi-stage piston cylinder 15 completes the rising and extending state. When the controller gives a signal, the servo proportional valve 7 works in the left position, and the electromagnetic ball valve 1 9-1, the electromagnetic ball valve 2 9-2, and the electromagnetic ball valve 4 13-2 are energized. At this time, the high-pressure oil source provided by the pump unit 2 passes through the one-way valve 4, the high-pressure oil filter 5, the pressure compensator 6, the servo proportional valve 7, the counter-valve 8-2, the electromagnetic ball valve 2 9-2 and the pipeline, and enters the upper chamber of the secondary cylinder, so that the secondary cylinder has a tendency to retract and descend. The hydraulic oil in the lower chamber of the secondary cylinder passes through the electromagnetic ball valve 4 13-2, the electromagnetic ball valve 1 9-1, the counter-valve 8-1, the servo proportional valve 7 and the pipeline back to the oil tank 1. At this time, the secondary cylinder retracts and descends (as shown). Figure 4 As shown); when the secondary cylinder retracts and descends into place, the displacement sensor of the multi-stage piston cylinder 15 transmits the displacement signal to the controller, the controller gives a signal, the servo proportional valve 7 works in the left position, and the electromagnetic ball valve 3 13-1 is energized. At this time, the high-pressure oil source provided by the pump unit 2 passes through the one-way valve 4, the high-pressure oil filter 5, the pressure compensator 6, the servo proportional valve 7, the counter-valve 8-2, the electromagnetic ball valve 2 9-2 and the pipeline, and enters the upper chamber of the primary cylinder, so that the primary cylinder has a tendency to retract and descend, and the hydraulic oil in the lower chamber of the primary cylinder passes through the electromagnetic ball valve 3 13-1, the electromagnetic ball valve 1 9-1, the counter-valve 8-1, the servo proportional valve 7 and the pipeline back to the oil tank 1. At this time, the primary cylinder retracts and descends (as shown). Figure 5 As shown in the figure, when the first cylinder is retracted and lowered into place, the multi-stage piston cylinder 15 completes the lowering and retracting state. During the lifting process, the controller receives the feedback signal of the displacement sensor in real time, adjusts the valve core in real time to accurately control the displacement of the oil cylinder, provides a control basis for the synchronous movement of multiple multi-stage piston cylinders 15, and realizes the precise position control of the multi-stage lifting device.

[0043] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0045] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A hydraulic drive control system for a multi-stage lifting device, characterized in that: It includes a lifting platform, a multi-stage lifting cylinder group, a control valve group, a hydraulic pipeline, a power station and a controller; the multi-stage lifting cylinder group is composed of a number of multi-stage piston cylinders arranged in parallel; the multi-stage lifting cylinder group is used to drive the lifting platform to rise and fall; each stage of the multi-stage piston cylinder is provided with an oil inlet and an oil outlet; the power station includes an oil tank and a pump unit; the control valve group is arranged at the bottom of the multi-stage lifting cylinder group and is connected to the power station through the hydraulic pipeline; the hydraulic drive control system performs comprehensive calculations and controls through the controller.

2. The hydraulic drive control system according to claim 1, characterized in that: The oil tank provides working oil for the multi-stage lifting cylinder group, the control valve group and the hydraulic pipeline; the pump unit includes a motor and a constant pressure pump, which is used to provide a pressure oil source for the multi-stage piston cylinder.

3. The hydraulic drive control system according to claim 1, characterized in that: The control valve group includes an electromagnetic overflow valve, a one-way valve, a high-pressure oil filter, a pressure compensator, a servo proportional valve, a counterbalance valve, an electromagnetic ball valve, a pressure sensor, a high-pressure ball valve and an explosion-proof valve; wherein the high-pressure oil filter is arranged at the oil outlet of the pump unit; the servo proportional valve has a built-in amplifier, and the controller controls the real-time high-frequency response of the servo proportional valve by collecting the signal of the displacement sensor on the multi-stage piston cylinder; The pressure compensator is used to adjust and stabilize the pressure difference on both sides of the servo proportional valve; The high-pressure ball valve is arranged on the oil inlet pipeline of the multi-stage piston cylinder; The electromagnetic ball valve and the explosion-proof valve are cooperatively arranged on the cylinder body of the multi-stage piston cylinder.

4. The hydraulic drive control system according to claim 1, characterized in that: A high-pressure rubber hose is provided on the oil outlet pipeline of the multi-stage piston cylinder to buffer pressure shock.

5. The hydraulic drive control system according to claim 1, characterized in that: The multi-stage piston cylinders are evenly distributed below the lifting platform, and the multi-stage piston cylinders are fixed on a cylinder base.

6. The hydraulic drive control system according to claim 1, characterized in that: Two sealing rings are arranged inside the multi-stage piston cylinder.

Images