Winch rubber pipe pressure control system and method

Abstract

The invention provides a winch rubber pipe pressure control system and method, and belongs to the field of engineering machinery tests. Comprising a main pump, a reversing valve, a main pushing oil cylinder, a winch, a rubber pipe, a pressure sensor, a main pump displacement adjusting device and a controller, and the main pump supplies oil to the main pushing oil cylinder through the reversing valve; an oil outlet of the reversing valve is connected to a rod cavity and a rodless cavity of the main push oil cylinder through rubber pipes wound on the winch. The pressure sensor detects the oil pressure in the rubber pipe and transmits the oil pressure to the controller; the main pump displacement adjusting device adjusts the displacement of the main pump according to a control signal of the controller; the controller controls the oil pressure in the rubber pipe to be increased at a given change rate according to the oil pressure collected by the pressure sensor. The change rate of oil pressure in the winch rubber pipe is controlled by adjusting the displacement of the main pump, it is ensured that the oil pressure in the winch rubber pipe rises gradually, the purpose of improving stress of the winch rubber pipe is achieved, abrasion between the winch rubber pipe and a winch is reduced, and the service life of the winch rubber pipe is prolonged.

Description

Technical Field

[0001] The invention relates to a winch hose pressure control system and method, belonging to the field of engineering machinery testing. Background Art

[0002] When the internal oil pressure of the hydraulic hose increases rapidly, the hose body expands under the action of the internal oil pressure, and the length of the hose will be shortened by 1%-2%. During normal construction of the underground continuous wall hydraulic grab, an upward lifting force will be applied to the winch hose to keep the hose in a taut state. When the underground continuous wall hydraulic grab is constructed in hard formations, the internal oil pressure of the winch hose will increase rapidly, and the hose will expand and contract, causing the tension on the hose to increase, and at the same time, severe friction will occur with the reel. If no special control is performed, the winch hose will be quickly damaged and leak oil under the action of tension and friction. At the same time, mud will enter the hydraulic system from the damaged hose, polluting the hydraulic system and damaging other hydraulic components, thereby causing huge economic losses and environmental pollution. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a winch hose pressure control system and method, which solves the problem that the oil pressure inside the winch hose increases rapidly.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In the first aspect, the present invention provides a winch hose pressure control system, comprising: a main pump, a reversing valve, a main push cylinder, a winch and a hose, wherein the main pump supplies oil to the main push cylinder through the reversing valve; the reversing valve is provided with at least two oil outlets, which are respectively connected to the rod chamber and the rodless chamber of the main push cylinder through the hose wound on the winch; the oil inlet of the reversing valve is connected to the oil outlet of the main pump; it also includes: a pressure sensor, a main pump displacement adjustment device and a controller; the pressure sensor is used to detect the real-time oil pressure inside the hose and transmit the real-time oil pressure to the controller; the main pump displacement adjustment device is used to adjust the main pump displacement according to the control signal of the controller; the controller is used to collect the real-time oil pressure of the pressure sensor, and calculate the main pump displacement that can increase the oil pressure inside the hose at a preset rate of change according to the real-time oil pressure, and generate a corresponding control signal to send to the main pump displacement adjustment device.

[0005] Furthermore, the reversing valve is a load-sensitive reversing valve provided with an LS feedback oil port; the main pump is a load-sensitive pump provided with a control oil port, and the pressure difference between the oil outlet and the control oil port of the load-sensitive pump is negatively correlated with its displacement; the LS feedback oil port of the load-sensitive reversing valve is connected to the control oil port of the load-sensitive pump to form a feedback oil circuit.

[0006] Furthermore, the main pump displacement adjustment device is a proportional overflow valve connected between the feedback oil circuit and the return oil circuit; the proportional overflow valve is connected to a controller, and the controller changes the pressure output to the control oil port of the load-sensitive pump by controlling the input current of the proportional overflow valve, so as to adjust the pressure difference between the oil outlet and the control oil port of the load-sensitive pump.

[0007] Furthermore, the proportional relief valve is an inverse proportional relief valve, and the pressure output by the proportional relief valve is inversely proportional to the input current of the proportional relief valve.

[0008] Furthermore, the reversing valve also includes: a pilot control port for receiving a control signal from a pilot oil circuit to achieve reversing of the reversing valve; the control system also includes: a starting unit, which is arranged at the pilot control port of the reversing valve, for capturing the reversing action of the reversing valve and feeding back the reversing action of the reversing valve to the controller.

[0009] Furthermore, the starting unit includes: a shuttle valve and a pressure switch; the pressure switch is connected to the controller signal; The reversing valve is provided with two pilot control ports; the two ports of the shuttle valve are respectively connected to the two pilot control ports, and the middle port is connected to the pressure switch, which is used to send the high-pressure signal of the pilot control port to the controller when the reversing valve performs the reversing action.

[0010] In a second aspect, the present invention provides a capstan hose pressure control method, wherein the capstan hose pressure control system comprises: a main pump, a reversing valve, a main push cylinder, a capstan, a hose, a pressure sensor, a main pump displacement adjustment device and a controller; Methods include: S1: Collect the pressure value of the pressure sensor and calculate the oil pressure change rate inside the hose; In response to the rate of change of the oil pressure inside the hose being less than a preset threshold, not performing the adjusting step; In response to the rate of change of the oil pressure inside the hose being not less than a preset threshold, performing an adjustment step; The adjusting step comprises: S2: Sending a control signal for adjusting the displacement of the main pump to the main pump displacement adjusting device to reduce the displacement of the main pump; S3: Collect the real-time pressure of the pressure sensor and calculate the real-time change rate of the oil pressure inside the hose; In response to the real-time rate of change of the oil pressure inside the hose being less than a preset threshold, maintaining the current displacement of the main pump; In response to the real-time change rate of the oil pressure inside the hose being not less than a preset threshold, the process jumps to S2.

[0011] Furthermore, the reversing valve is a load-sensitive reversing valve; the main pump is a load-sensitive pump, and a feedback oil circuit is formed between the LS feedback oil port of the load-sensitive reversing valve and the control oil port of the load-sensitive pump; the main pump displacement adjustment device is an inverse proportional overflow valve connected between the feedback oil circuit and the return oil circuit; S2 includes: sending an input current that increases with a preset slope to the inverse proportional overflow valve.

[0012] Furthermore, the capstan hose pressure control system also includes: a pressure switch installed at the pilot control port of the reversing valve; the pressure switch is connected to the controller signal.

[0013] Before S1, it also includes: S0: collecting the status information of the pressure switch, in response to the action of the pressure switch, jumping to S1; in response to the non-action of the pressure switch, jumping to S0.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the device provided by the present invention can use a pressure sensor to monitor the real-time oil pressure inside the capstan hose, and a main pump displacement adjustment device is provided to control the rate of change of the oil pressure inside the capstan hose by adjusting the main pump displacement, thereby ensuring that the oil pressure inside the capstan hose gradually increases, thereby achieving the purpose of improving the force of the capstan hose, reducing the wear of the capstan hose and the capstan, and increasing the service life of the capstan hose. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a capstan hose pressure control system in some embodiments of the present invention; In the figure: 1-main push cylinder; 2-pressure sensor 1; 3-pressure sensor 2; 4-capstan hose 1; 5-capstan hose 2; 6-capstan 1; 7-capstan 2; 8-reversing valve; 9-pressure switch; 10-shuttle valve; 11-proportional relief valve; 12-main pump; 13-engine; 14-controller. DETAILED DESCRIPTION

[0016] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Example 1

[0017] It should be noted that winch hoses are generally suitable for construction machinery such as hydraulic grabs. They are used to transport hydraulic oil between the main pump and the main push cylinder. They are respectively connected to the rodless chamber oil inlet and the rod chamber oil inlet of the main push cylinder. During normal construction, higher pressure is required to achieve rapid extension and retraction of the piston rod.

[0018] This embodiment provides a capstan hose pressure control system, such as Figure 1 As shown, the device includes: a main push cylinder 1, a pressure sensor, a main pump displacement adjustment device, a capstan hose, a capstan, a reversing valve 8, a main pump 12, an engine 13 and a controller 14.

[0019] Specifically, the engine 13 is connected to the main pump 12 via a coupling; the S port of the main pump 12 is connected to the oil tank, and the A port is connected to the P port of the reversing valve 8. The main pump 12 supplies oil to the main push cylinder 1 through the reversing valve 8; the reversing valve 8 controls the extension and retraction of the main push cylinder 1. The reversing valve 8 and the main push cylinder 1 are connected by a capstan hose wound on a capstan, and a pressure sensor is arranged at the oil inlet of the main push cylinder 1 to detect the real-time oil pressure inside the hose and transmit the real-time oil pressure to the controller.

[0020] In some specific embodiments, the reversing valve 8 is provided with two oil outlets: oil outlet A and oil outlet B. Oil outlet A is connected to the rodless chamber oil inlet of the main push oil cylinder 1 through the capstan hose 14 wound on the capstan 16, and oil outlet B is connected to the rod chamber oil inlet of the main push oil cylinder 1 through the capstan hose 25 wound on the capstan 27. At the same time, the rodless chamber oil inlet and the rod chamber oil inlet of the main push oil cylinder 1 are provided with a pressure sensor 12 and a pressure sensor 23 respectively; the pressure sensor 12 is used to detect the pressure of the rodless chamber of the main push oil cylinder 1 and the oil pressure inside the capstan hose 14, and feed back the signal to the controller 14, and the pressure sensor 23 is used to detect the pressure of the rod chamber of the main push oil cylinder 1 and the oil pressure inside the capstan hose 25, and feed back the signal to the controller 14.

[0021] In some more specific embodiments, the length of the capstan hose 1 4 and the capstan hose 2 5 is generally 60-110 m; both are wound on the capstan in a single-row multi-layer form.

[0022] In some specific embodiments, the reversing valve 8 is a load-sensitive reversing valve provided with an LS feedback oil port, and the main pump is a load-sensitive pump provided with a control oil port; the oil inlet of the reversing valve 8 is connected to the oil outlet of the main pump 12; the LS feedback oil port of the load-sensitive reversing valve is connected to the control oil port of the load-sensitive pump to form a feedback oil circuit.

[0023] It should be noted that the pressure difference between the oil outlet and the control oil port of the load sensing pump is negatively correlated with its displacement, that is, the smaller the pressure difference between the oil outlet and the control oil port of the load sensing pump, the larger its displacement.

[0024] The main pump displacement regulating device is used to regulate the main pump displacement according to the control signal of the controller 14 .

[0025] In the embodiment where the reversing valve 8 is a load-sensitive reversing valve and the main pump 12 is a load-sensitive pump, the main pump displacement regulating device is a proportional relief valve 11 connected between the feedback oil circuit and the return oil circuit; the control oil port of the main pump 12, the LS port of the reversing valve 8 and the P port of the proportional relief valve 11 are connected, and the T port of the proportional relief valve 11 directly returns oil. The proportional relief valve 11 is connected to the controller 14.

[0026] In some specific embodiments, the proportional relief valve is an inverse proportional relief valve, and the pressure output by the proportional relief valve is inversely proportional to the input current of the proportional relief valve.

[0027] The controller 14 is used to collect the real-time oil pressure of the pressure sensor, and calculate the main pump displacement that can increase the internal oil pressure of the hose at a preset rate of change based on the real-time oil pressure, and generate a corresponding control signal to send to the main pump displacement adjustment device.

[0028] In an embodiment where the reversing valve is a load-sensitive reversing valve and the main pump is a load-sensitive pump, the controller includes three input terminals and one output terminal, the three input terminals respectively receive oil pressure data from pressure sensor 1 2 and pressure sensor 2 3, and the one output terminal is used to output control current to the proportional relief valve 11.

[0029] In actual control operation, the controller continuously collects the pressure values ​​of pressure sensor 1 2 and pressure sensor 2 3, and finally outputs the control current from the output end to the proportional relief valve 11 through logical operation and judgment control, so as to change the pressure outputted from the proportional relief valve 11 to the control oil port of the load-sensitive pump. The pressure change of the control oil port of the load-sensitive pump causes the pressure difference between the oil outlet and the control oil port of the load-sensitive pump to change. Due to the characteristics of the load-sensitive pump itself, changing the pressure difference between the oil outlet and the control oil port of the load-sensitive pump means changing its displacement.

[0030] This design enables the controller 14 to adjust the displacement of the load-sensitive pump in time according to the real-time oil pressure inside the hose, so as to achieve a smooth change in the oil pressure inside the hose, avoiding the expansion and contraction of the hose caused by the rapid increase of the oil pressure inside the hose, resulting in an increase in the tension on the hose and severe friction with the capstan. Example 2

[0031] Based on Example 1, this example provides a winch hose pressure control system equipped with a starting unit.

[0032] like Figure 1 As shown, the reversing valve 8 in this embodiment is further provided with two pilot control ports: port a and port b, which are used to receive control signals of the pilot oil circuit to realize reversing of the reversing valve 8 .

[0033] Because in the actual oil supply process, the internal oil pressure of the hose will rise rapidly and cause the hose to expand and contract only when the main push cylinder 1 switches to extend or retract, that is, when the oil outlet of the reversing valve 8 switches from port A to port B or from port B to port A.

[0034] Therefore, this embodiment sets a starting unit at the pilot control port of the reversing valve 8 to capture the reversing action of the reversing valve 8 and feeds back the reversing action of the reversing valve 8 to the controller 14. After receiving the starting signal from the starting unit, the controller 14 starts to monitor the oil pressure data of the pressure sensor 1 2 and the pressure sensor 2 3, and then controls the displacement of the main pump 12.

[0035] In some specific embodiments, the starting unit includes: a shuttle valve 10 and a pressure switch 9 .

[0036] Specifically, the ports on both sides of the shuttle valve 10 are connected to the pilot control ports a and b respectively, and are used to send the high-pressure signal of the pilot control port to the controller 14 when the reversing valve 8 performs the reversing action. The middle port of the shuttle valve 10 is connected to the pressure switch 9, and the pressure switch 9 is connected to the controller 14 signal; the pressure switch 9 is used to detect whether there is oil pressure at the middle port of the shuttle valve 10. When the port a or the port b generates a high-pressure signal, it means that the reversing valve 8 is about to perform the reversing action. At this time, the pressure switch 9 will be activated and the high-pressure signal of the pilot control oil port a or the port b will be output from the middle port to the controller 14.

[0037] In some specific embodiments, the pressure switch 9 is a normally closed switch, and the pressure switch 9 is opened when a high-pressure signal is detected. Example 3

[0038] This embodiment provides a method for controlling the pressure of a capstan hose. The method adopts the capstan hose pressure control system described in Embodiment 1 or Embodiment 2. The method includes: S1: Collect the pressure value of the pressure sensor and calculate the oil pressure change rate inside the hose; In response to the rate of change of the oil pressure inside the hose being less than a preset threshold, not performing the adjusting step; In response to the rate of change of the oil pressure inside the hose being not less than a preset threshold, performing an adjustment step; The adjusting step comprises: S2: Sending a control signal for adjusting the displacement of the main pump to the main pump displacement adjusting device to reduce the displacement of the main pump; S3: Collect the real-time pressure of the pressure sensor and calculate the real-time change rate of the oil pressure inside the hose; In response to the real-time rate of change of the oil pressure inside the hose being less than a preset threshold, maintaining the current displacement of the main pump; In response to the real-time change rate of the oil pressure inside the hose being not less than a preset threshold, the process jumps to S2.

[0039] The method provided in this embodiment periodically calculates the oil pressure change rate inside the hose according to the pressure value of the pressure sensor, and compares the oil pressure change rate inside the hose with a preset upper limit threshold. Once the upper limit threshold is reached or exceeded, the adjustment program is awakened.

[0040] The adjustment procedure refers to controlling and adjusting the displacement of the main pump through the main pump displacement adjustment device to make it smaller, so as to achieve the effect of slowing down the increase of the oil pressure inside the hose.

[0041] In the embodiment where the main pump displacement regulating device is a proportional relief valve, the regulating procedure is to send an input current that increases with a preset slope to the proportional relief valve.

[0042] In the embodiment of configuring the pressure switch, before S1, it also includes: S0: collecting status information of the pressure switch; in response to the action of the pressure switch, jumping to S1; in response to the inaction of the pressure switch, jumping to S0.

[0043] After the pressure switch 9 is turned on, the turn-on signal is transmitted back to the controller 14, and the controller 14 outputs an initial current to the proportional relief valve 11, so that the pressure output to the main pump 12 will not change significantly in a short time. Subsequently, the controller 14 adjusts the current output to the proportional relief valve 11 according to the pressure values ​​of the pressure sensor 12 and the pressure sensor 23, so that the pressure of the main pump 12 rises slowly, that is, the displacement of the main pump 12 increases step by step. The problem that the capstan hose contracts rapidly due to the drastic change in the internal oil pressure when the main push cylinder 1 is extended and retracted quickly with a large load is solved. At this time, the tension on the hose increases and the hose is easily damaged by rubbing violently with the capstan.

[0044] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A capstan hose pressure control system, comprising: A main pump, a reversing valve, a main push oil cylinder, a capstan and a hose, wherein the main pump supplies oil to the main push oil cylinder through the reversing valve; The reversing valve is provided with at least two oil outlets, which are respectively connected to the rod chamber and the rodless chamber of the main push oil cylinder through the hose wound on the capstan; the oil inlet of the reversing valve is connected to the oil outlet of the main pump; it is characterized in that it also includes: Pressure sensor, main pump displacement adjustment device and controller; The pressure sensor is used to detect the real-time oil pressure inside the hose and transmit the real-time oil pressure to the controller; The main pump displacement regulating device is used to regulate the main pump displacement according to the control signal of the controller; The controller is used to collect the real-time oil pressure of the pressure sensor, and calculate the main pump displacement that can increase the internal oil pressure of the hose at a preset change rate based on the real-time oil pressure, and generate a corresponding control signal to send to the main pump displacement adjustment device.

2. The winch hose pressure control system according to claim 1, characterized in that: The reversing valve is a load-sensitive reversing valve provided with an LS feedback oil port; The main pump is a load-sensitive pump provided with a control oil port, and the pressure difference between the oil outlet of the load-sensitive pump and the control oil port is negatively correlated with its displacement; The LS feedback oil port of the load-sensitive reversing valve is connected to the control oil port of the load-sensitive pump to form a feedback oil circuit.

3. The winch hose pressure control system according to claim 2, characterized in that: The main pump displacement adjustment device is a proportional relief valve connected between the feedback oil circuit and the return oil circuit; the proportional relief valve is connected to the controller, and the controller changes the pressure output to the load-sensitive pump control oil port by controlling the input current of the proportional relief valve to adjust the pressure difference between the load-sensitive pump oil outlet and the control oil port.

4. The capstan hose pressure control system according to claim 3, characterized in that: The proportional relief valve is an inverse proportional relief valve, and the pressure output by the proportional relief valve is inversely proportional to the input current of the electromagnetic valve.

5. The capstan hose pressure control system according to claim 1, characterized in that: The reversing valve further comprises: a pilot control port for receiving a control signal of the pilot oil circuit to realize reversing of the reversing valve; The control system further comprises: a starting unit, which is arranged at the pilot control port of the reversing valve and is used to capture the reversing action of the reversing valve and feed back the reversing action of the reversing valve to the controller.

6. The capstan hose pressure control system according to claim 5, characterized in that: The starting unit includes: a shuttle valve and a pressure switch; the pressure switch is connected to the controller signal; The reversing valve is provided with two pilot control ports; The two ports of the shuttle valve are respectively connected to the two pilot control ports, and the middle port is connected to the pressure switch for sending the high-pressure signal of the pilot control port to the controller when the reversing valve performs a reversing action.

7. A capstan hose pressure control method, characterized in that: The capstan hose pressure control system used includes: main pump, reversing valve, main push cylinder, capstan, hose, pressure sensor, main pump displacement adjustment device and controller; Methods include: S1: Collect the pressure value of the pressure sensor and calculate the oil pressure change rate inside the hose; In response to the rate of change of the oil pressure inside the hose being less than a preset threshold, not performing the adjusting step; In response to the rate of change of the oil pressure inside the hose being not less than a preset threshold, performing an adjustment step; The adjusting step comprises: S2: Sending a control signal for adjusting the displacement of the main pump to the main pump displacement adjusting device to reduce the displacement of the main pump; S3: Collect the real-time pressure of the pressure sensor and calculate the real-time change rate of the oil pressure inside the hose; In response to the real-time rate of change of the oil pressure inside the hose being less than a preset threshold, maintaining the current displacement of the main pump; In response to the real-time change rate of the oil pressure inside the hose being not less than a preset threshold, the process jumps to S2.

8. The capstan hose pressure control method according to claim 7, characterized in that: The reversing valve is a load-sensitive reversing valve; the main pump is a load-sensitive pump, and a feedback oil circuit is formed between the LS feedback oil port of the load-sensitive reversing valve and the control oil port of the load-sensitive pump; The main pump displacement regulating device is an inverse proportional relief valve connected between the feedback oil circuit and the return oil circuit; The step S2 includes sending an input current increasing with a preset slope to an inverse proportional relief valve.

9. The capstan hose pressure control method according to claim 8, characterized in that: The capstan hose pressure control system further comprises: a pressure switch installed at the pilot control port of the reversing valve; the pressure switch is connected to the controller signal; Prior to S1, this also included: S0: Collect the status information of the pressure switch, In response to the action of the pressure switch, jump to S1; In response to the pressure switch not being actuated, jump to S0.

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