Coreless tube telescopic oil cylinder control system and crane

Abstract

The invention discloses a core-pipe-free telescopic oil cylinder control system and a crane in the technical field of engineering machinery, the control system comprises a main control assembly and an in-arm control assembly, the main control assembly comprises a main controller, a telescopic oil cylinder large cavity pressure sensor and a telescopic balance valve, and the telescopic oil cylinder large cavity pressure sensor and the telescopic balance valve are electrically connected with the main controller; the in-arm control assembly comprises an in-arm controller, an in-arm detection element and an in-arm control element, wherein the in-arm detection element and the in-arm control element are electrically connected with the in-arm controller. And the main controller is electrically connected with the in-arm controller. The in-arm detection element comprises a cylinder arm pin detection switch, an arm position detection switch and an energy accumulator pressure sensor; the in-arm control element includes a cylinder pin switching valve and an arm pin switching valve. The in-arm controller is integrated in the arm and is combined with the main controller outside the arm for control, so that the telescopic controllability and the micro-motion performance are improved, meanwhile, element types and wire harness manufacturing are reduced, and maintenance and detection are convenient.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, and in particular to a coreless tube telescopic oil cylinder control system and a crane. Background Art

[0002] The single cylinder bolt telescopic system has the advantages of long arm length and high performance. It is the mainstream telescopic system for medium and large tonnage wheel cranes. The mainstream telescopic form in the industry is: use an independent oil supply system to supply oil to the cylinder head through the movable core tube of the telescopic oil cylinder; pull out the cylinder pin and arm pin through the built-in oil cylinder of the cylinder head, and reset the spring; use the pressure of the small chamber of the telescopic oil cylinder to open the balance valve to realize the retraction of the telescopic oil cylinder. On this basis, a distributed control system is used to detect and control this process.

[0003] However, with the continuous development of technology, the problems of the above-mentioned telescopic system, such as complex structure, high cost and difficulty in further improving controllability, have gradually been exposed. The bus module in the original distributed system no longer meets the control requirements of the coreless tube telescopic system, and a new bus module needs to be developed. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a coreless tube telescopic cylinder control system and a crane, and solve the technical problem that the existing distributed control system is increasingly unable to meet the control requirements of the coreless tube telescopic system.

[0005] 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 coreless tube telescopic cylinder control system, comprising a main control component and an in-arm control component, wherein the main control component comprises a main controller, a telescopic cylinder large-cavity pressure sensor and a telescopic balancing valve electrically connected to the main controller; the in-arm control component comprises an in-arm controller, an in-arm detection element and an in-arm control element electrically connected to the in-arm controller; the main controller is electrically connected to the in-arm controller.

[0006] Optionally, the detection element in the arm includes a cylinder arm pin detection switch, an arm position detection switch and an accumulator pressure sensor; the control element in the arm includes a cylinder pin switching valve and an arm pin switching valve.

[0007] Optionally, the main controller and the in-arm controller are connected via a CAN bus.

[0008] Optionally, the in-arm controller is connected to the in-arm detection element and the in-arm control element via a prefabricated cable, and an M12 connector is used at the end of the prefabricated cable.

[0009] Optionally, the in-arm controller is also provided with a module diagnostic indicator light and an interface diagnostic indicator light for displaying the operating status.

[0010] Optionally, the in-arm controller is provided with an AI interface, a DI interface, a DO interface, an I / O interface and a CAN bus interface for signal connection.

[0011] Optionally, the controller is also connected to a display, and the display is used for human-computer interaction.

[0012] In a second aspect, the present invention provides a crane, comprising the above-mentioned coreless tube telescopic cylinder control system.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a coreless telescopic oil cylinder control system and a crane, which are provided with a main control component and an in-arm control component. In the in-arm control component, the proximity switch, cylinder arm pin control valve, oil pressure sensor, etc. are integrated and controlled by the in-arm controller. Compared with the traditional method of controlling the in-arm by the main control component, the types of components and wiring harness production are reduced, and maintenance and inspection are convenient. In the main control component, the electric control telescopic balance valve is adjusted according to the pressure of the large cavity of the telescopic oil cylinder to control the oil supply of the large and small cavities of the telescopic cylinder, thereby improving the telescopic controllability and micro-movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural block diagram of a coreless tube telescopic cylinder control system provided by an embodiment of the present invention; Figure 2 is a schematic diagram of the installation of the main control assembly provided by an embodiment of the present invention; Figure 3 is a schematic diagram of the installation of an in-arm control assembly provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of a panel of an in-arm controller of a double-cylinder coreless tube telescopic cylinder provided in an embodiment of the present invention; Figure 5 It is a panel schematic diagram of an in-arm controller of a single-cylinder coreless tube telescopic cylinder provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0016] Embodiment 1:

[0017] like Figure 1As shown, the present invention provides a coreless telescopic cylinder control system, including a main control component, an in-arm control component and a display, the main control component includes a main controller, a telescopic cylinder large-cavity pressure sensor and a telescopic balancing valve electrically connected to the main controller; the in-arm control component includes an in-arm controller, an in-arm detection element and an in-arm control element electrically connected to the in-arm controller; the main controller is electrically connected to the in-arm controller.

[0018] Specifically, in this embodiment, the detection element in the arm includes a cylinder arm pin detection switch, an arm position detection switch, and an accumulator pressure sensor; the control element in the arm includes a cylinder pin switching valve and an arm pin switching valve. The main controller and the controller in the arm are connected via a CAN bus. The controller in the arm is connected to the detection element in the arm and the control element in the arm via a prefabricated cable, and the end of the prefabricated cable adopts an M12 connector.

[0019] Cylinder arm pin detection switch, monitors the real-time position status of the cylinder arm pin. Arm position detection switch: installed on the telescopic oil cylinder head body, detects the arm position of the extended arm. Accumulator pressure sensor: detects the accumulator pressure of the telescopic oil cylinder. Cylinder pin switching valve: controls the opening and closing of the cylinder pin oil circuit. Arm pin switching valve: controls the opening and closing of the arm pin oil circuit. Telescopic cylinder large cavity oil pressure sensor: detects the large cavity oil pressure of the telescopic oil cylinder.

[0020] like Figure 2 and Figure 3 As shown in the figure, the controller in the arm collects the detection information of the arm pin detection switch and the arm position detection switch on the telescopic oil cylinder, and transmits it to the main controller through the CAN bus, thereby controlling the telescopic balance valve to extend and retract the telescopic oil cylinder. The controller in the arm receives the command of the main controller, reads the detection information of the accumulator pressure sensor, and controls the cylinder pin switching valve and the arm pin switching valve.

[0021] Main controller: Receives detection information of the detection element in the arm from the controller in the arm and forwards it to the display. Generates control instructions, transmits information to the controller in the arm, controls the extension and retraction of the coreless tube; controls the electric control extension and retraction balance valve, adjusts the pressure of the large cavity of the extension and retraction cylinder, and improves controllability.

[0022] Display: Receives and displays the cylinder arm pin and arm position status forwarded by the main controller, and displays the accumulator pressure and telescopic cylinder large chamber pressure values. The display is also used for human-computer interaction.

[0023] like Figure 4As shown in the figure, for the double-cylinder coreless telescopic cylinder, the arm controller needs to be equipped with 16 DI interfaces, 1 AI interface, 2 DO interfaces and 1 CAN bus interface. The CAN bus interface uses a five-core needle seat A-Code connector with a built-in 120 ohm resistor, and the CAN address and baud rate are built-in; the I / O interface uses a five-core hole M12 A-Code connector. Each proximity switch is connected to the solenoid reversing valve through an injection-molded integrated cable, and communication is established with the force limiter through the CAN bus interface and the injection-molded CAN line.

[0024] AI interface: DC analog input is generally 0-5V or 4-20MA standard signal input. DI interface: Switch input reflects whether the switch state is open or closed. DO interface: Switch output can be a relay or a high-power tube, etc. AO interface: DC analog output is generally 0-10V or 4-20MA signal output, as signal conditioning.

[0025] like Figure 5 As shown in the figure, for a single-cylinder coreless telescopic cylinder, the arm controller needs to be equipped with 8 DI interfaces, 1 AI interface, 2 DO interfaces and 1 CAN bus interface. The interface format is the same as that of the double-cylinder head coreless telescopic cylinder arm controller.

[0026] Embodiment 2:

[0027] An embodiment of the present invention provides a crane, comprising the above-mentioned coreless tube telescopic cylinder control system.

[0028] The control principle is as follows: a. After the crane is powered on, the controller inside the arm, the cylinder arm pin detection switch, the arm position detection switch, and the accumulator pressure sensor are powered on and work, and the controller inside the arm receives the signals from these sensors.

[0029] b. The controller inside the arm converts the sensor signal into a bus format and sends it to the main controller via the communication cable at the end of the arm.

[0030] c. The main controller receives the sensor signal in the arm from the controller in the arm and the telescopic large cavity oil pressure sensor signal behind the turntable, and sends it to the display.

[0031] d. The display receives and displays the accumulator pressure, telescopic cylinder large chamber pressure value, current boom cylinder arm pin status, and arm position status forwarded by the controller, sets the telescopic combination on the main interface and transmits the signal to the main controller.

[0032] e. The main controller performs telescopic control according to the predetermined telescopic combination, detects the pressure value in the accumulator, takes oil from the large and small chambers of the telescopic oil cylinder, controls the release of the accumulator oil, and controls the cylinder arm pin drive mechanism; sends relevant commands to the controller inside the arm, controls the insertion and extraction of the cylinder arm pin through the opening and closing of the electromagnetic reversing valve, and releases it after reaching the specified arm position. During the telescopic arm process, the pressure value of the large chamber of the telescopic oil cylinder is detected, and the valve opening of the electronically controlled telescopic balance valve is controlled to improve the telescopic controllability and micro-movement.

[0033] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A coreless telescopic cylinder control system, characterized in that: It includes a main control component and an in-arm control component. The main control component includes a main controller, a telescopic cylinder large-cavity pressure sensor and a telescopic balancing valve electrically connected to the main controller; the in-arm control component includes an in-arm controller, an in-arm detection element and an in-arm control element electrically connected to the in-arm controller; the main controller is electrically connected to the in-arm controller.

2. The coreless tube telescopic cylinder control system according to claim 1 is characterized in that: The detection element in the arm includes a cylinder arm pin detection switch, an arm position detection switch and an accumulator pressure sensor; the control element in the arm includes a cylinder pin switching valve and an arm pin switching valve.

3. The coreless tube telescopic cylinder control system according to claim 1 is characterized in that: The main controller and the in-arm controller are connected via a CAN bus.

4. The coreless tube telescopic cylinder control system according to claim 1 is characterized in that: The in-arm controller is connected to the in-arm detection element and the in-arm control element via a prefabricated cable, and an M12 connector is used at the end of the prefabricated cable.

5. The coreless tube telescopic cylinder control system according to claim 1 is characterized in that: The in-arm controller is also provided with a module diagnosis indicator light and an interface diagnosis indicator light for displaying the operating status.

6. The coreless tube telescopic cylinder control system according to claim 1, characterized in that: The in-arm controller is provided with an AI interface, a DI interface, a DO interface, an I / O interface and a CAN bus interface for signal connection.

7. The coreless tube telescopic cylinder control system according to claim 1, characterized in that: The controller is also connected to a display, which is used for human-computer interaction.

8. A crane, characterized in that: It comprises the coreless tube telescopic cylinder control system as described in any one of claims 1-7.

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