Adaptive Control System of Push Tube Machine with Variable Clamping Force

Abstract

The present invention discloses an adaptive control system for a push tube machine with variable clamping force, belonging to the technical field of engineering machinery equipment. A clamp valve controls the connection to a clamp oil cylinder, and a clamp overflow valve is connected to the clamp oil cylinder; a push-pull valve controls the connection to a push-pull oil cylinder, and a push-pull overflow valve is connected to the push-pull oil cylinder; a clamp pressure sensor is installed on the clamp oil cylinder; the clamp pressure sensor is electrically connected to a vehicle-mounted controller; a push-pull large chamber sensor and a push-pull small chamber sensor are installed in the push-pull oil cylinder; the push-pull large chamber sensor and the push-pull small chamber sensor are electrically connected to the vehicle-mounted controller; a clamping force adjustment potentiometer and a push-pull force adjustment potentiometer are electrically connected to the vehicle-mounted controller, and the vehicle-mounted controller is controllably connected to the clamp valve, the clamp overflow valve, the push-pull valve, and the push-pull overflow valve. The present invention realizes the effect of reducing the clamp force on the premise of maintaining the clamping effect, thereby realizing the use under reduced pressure during construction and effectively extending the service life of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery equipment, and specifically to an adaptive control system for a pipe pusher with variable clamping force. Background Art

[0002] The clamp is a key component on the pipe pusher. For the pipe pushers used in the market, the clamping force of its clamp adopts an artificial control method, that is, the operator directly determines a fixed clamping force according to the characteristics such as the pipe diameter, wall thickness, and material during actual construction. Often, due to the lack of experience of the operator, situations such as pipe sliding caused by insufficient set pipe clamping force or pipe collapse and deformation caused by excessive set pipe clamping force occur, resulting in significant engineering losses. Although some operators are experienced and will not damage the pipe due to excessive pipe clamping force, there are also disadvantages of high clamping pressure, and there is a situation where the hydraulic components are prone to have a short service life due to the frequent high pressure of the hydraulic system. Summary of the Invention

[0003] To overcome the deficiencies of the above-mentioned prior art, the present invention provides an adaptive control system for a pipe pusher with variable clamping force that can automatically match the pipe clamping pressure according to the characteristics of the pipe and the pushing or pulling force during construction.

[0004] The present invention is realized through the following technical solutions: An adaptive control system for a pipe pusher with variable clamping force, a clamp valve controls the connection to a clamp oil cylinder, and a clamp relief valve is connected to the clamp oil cylinder; a push-pull valve controls the connection to a push-pull oil cylinder, and a push-pull relief valve is connected to the push-pull oil cylinder; a clamp pressure sensor for detecting the pressure in the large chamber of the clamp oil cylinder is installed in the clamp oil cylinder; the clamp pressure sensor is electrically connected to the vehicle-mounted controller; a push-pull large chamber sensor for detecting the pressure in the large chamber of the push-pull oil cylinder and a push-pull small chamber sensor for detecting the pressure in the small chamber of the push-pull oil cylinder are installed in the push-pull oil cylinder; the push-pull large chamber sensor and the push-pull small chamber sensor are electrically connected to the vehicle-mounted controller; a clamping force adjustment potentiometer and a push-pull force adjustment potentiometer are electrically connected to the vehicle-mounted controller, and the vehicle-mounted controller controls and connects the clamp valve, the clamp relief valve, the push-pull valve, and the push-pull relief valve.

[0005] Further, the push-pull small chamber sensor is a voltage or current type pressure sensor; the push-pull small chamber sensor is installed at the piston rod end of the push-pull oil cylinder to monitor the pressure in the small chamber of the push-pull oil cylinder.

[0006] The push-pull large chamber sensor is a voltage or current type pressure sensor; the push-pull large chamber sensor is installed at the piston end of the push-pull oil cylinder to monitor the pressure in the large chamber of the push-pull oil cylinder.

[0007] The clamp pressure sensor is a voltage or current type pressure sensor; the clamp pressure sensor is installed at the piston end of the clamp oil cylinder to monitor the pressure in the large chamber of the clamp oil cylinder.

[0008] The push-pull overflow valve is a voltage or current type pressure control device; the push-pull overflow valve is installed on the main oil path of the push-pull valve to adjust the working pressure of the push-pull oil cylinder.

[0009] The clamp overflow valve is a voltage or current type pressure control device; the clamp overflow valve is installed on the main oil path of the clamp valve to adjust the working pressure of the clamping oil cylinder.

[0010] During operation, the vehicle-mounted controller calculates the actual pushing or pulling force during construction based on the values of the push-pull small chamber sensor and the push-pull large chamber sensor, and automatically back-calculates the clamping pressure of the clamping oil cylinder using this pushing or pulling force. When the calculated clamping pressure is less than the pressure set by the clamping force adjustment potentiometer, the vehicle-mounted controller automatically reduces the set value of the clamp overflow valve, thereby achieving the effect of reducing the clamp force while maintaining the clamping effect; if the calculated clamping pressure is greater than or equal to the pressure set by the clamping force adjustment potentiometer, this control system does not function.

[0011] Compared with the prior art, the beneficial effects of the present invention are: on the premise of maintaining the clamping effect, the effect of reducing the clamp force is achieved, and further, the use under reduced pressure during construction is realized, effectively extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the control schematic diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The following is a specific embodiment of the present invention, and the present invention will be further described below in conjunction with the accompanying drawings.

[0014] Combined with Figure 1 As shown, a self-adaptive control system for a pipe pusher with variable clamping force, the clamp valve controls the connection to the clamping oil cylinder, and the clamping oil cylinder is connected with a clamp overflow valve; the push-pull valve controls the connection to the push-pull oil cylinder, and the push-pull oil cylinder is connected with a push-pull overflow valve.

[0015] A clamp pressure sensor for detecting the pressure in the large chamber of the clamping oil cylinder is installed in the clamping oil cylinder. The clamp pressure sensor is a voltage or current type pressure sensor; the clamp pressure sensor is installed at the piston end of the clamping oil cylinder to monitor the pressure in the large chamber of the clamping oil cylinder. The clamp pressure sensor is electrically connected to the vehicle-mounted controller. The vehicle-mounted controller receives the signal detected by the clamp pressure sensor, and the vehicle-mounted controller can calculate the actual clamping force during construction based on the value of the clamp pressure sensor.

[0016] A push-pull oil cylinder is equipped with a push-pull large chamber sensor for detecting the pressure in the large chamber of the push-pull oil cylinder and a push-pull small chamber sensor for detecting the pressure in the small chamber of the push-pull oil cylinder. The push-pull small chamber sensor is a voltage or current type pressure sensor; the push-pull small chamber sensor is installed at the piston rod end of the push-pull oil cylinder to monitor the pressure in the small chamber of the push-pull oil cylinder. The push-pull large chamber sensor is a voltage or current type pressure sensor; the push-pull large chamber sensor is installed at the piston end of the push-pull oil cylinder to monitor the pressure in the large chamber of the push-pull oil cylinder. The push-pull large chamber sensor and the push-pull small chamber sensor are electrically connected to the vehicle-mounted controller. The vehicle-mounted controller electrically receives the signals detected by the push-pull large chamber sensor and the push-pull small chamber sensor respectively. The vehicle-mounted controller can calculate the actual pushing and pulling force during construction based on the values of the push-pull large chamber sensor and the push-pull small chamber sensor, and based on this actual pushing and pulling force, inversely calculate the clamping pressure required by the clamping oil cylinder.

[0017] The clamping force adjustment potentiometer and the push-pull force adjustment potentiometer are electrically connected to the vehicle-mounted controller. The vehicle-mounted controller calculates the limit values of the clamping force and the push-pull force set by the operator by receiving the signals of the clamping force adjustment potentiometer and the push-pull force adjustment potentiometer. The vehicle-mounted controller is controllably connected to the clamping valve, the clamping overflow valve, the push-pull valve, and the push-pull overflow valve. The push-pull overflow valve is a voltage or current type pressure control device; the push-pull overflow valve is installed on the main oil path of the push-pull valve to adjust the working pressure of the push-pull oil cylinder. The clamping overflow valve is a voltage or current type pressure control device; the clamping overflow valve is installed on the main oil path of the clamping valve to adjust the working pressure of the clamping oil cylinder.

[0018] The vehicle-mounted controller not only receives the signals from the pressure sensors on the push-pull oil cylinder and the clamping oil cylinder, but also receives the signals from the clamping force adjustment potentiometer and the push-pull force adjustment potentiometer, and converts the signals of the potentiometer into the pressures of the push-pull oil cylinder and the clamping oil cylinder; the vehicle-mounted controller controls the actions and flows of the push-pull valve and the clamping valve, and also electrically proportionally controls the set overflow pressures of the push-pull overflow valve and the clamping overflow valve. The vehicle-mounted controller compares the calculated clamping force with the set clamping force. If the calculated clamping force is less than the set clamping force, the system automatically reduces the set value of the clamping overflow valve, achieving pressure reduction during construction.

[0019] Working principle:

[0020] The vehicle-mounted controller calculates the actual pushing and pulling force during construction based on the values of the push-pull large chamber sensor and the push-pull small chamber sensor, and automatically inversely calculates the clamping pressure required by the clamping oil cylinder using the above actual pushing force. When the calculated clamping pressure is less than the pressure set by the clamping force adjustment potentiometer, the vehicle-mounted controller automatically reduces the set value of the clamping overflow valve, thereby achieving the effect of reducing the clamping force while maintaining the clamping effect, realizing pressure reduction during construction, and effectively extending the service life of the equipment.

Claims

1. An adaptive control system for a pipe pusher with variable clamping force, where a clamp valve controls the connection to a clamp oil cylinder, and the clamp oil cylinder is connected with a clamp relief valve; a push-pull valve controls the connection to a push-pull oil cylinder, and the push-pull oil cylinder is connected with a push-pull relief valve; It is characterized in that: A clamp pressure sensor for detecting the pressure in the large chamber of the clamp cylinder is installed in the clamp cylinder; the clamp pressure sensor is electrically connected to the vehicle-mounted controller; A push-pull large chamber sensor for detecting the pressure in the large chamber of the push-pull cylinder and a push-pull small chamber sensor for detecting the pressure in the small chamber of the push-pull cylinder are installed in the push-pull cylinder; the push-pull large chamber sensor and the push-pull small chamber sensor are electrically connected to the vehicle-mounted controller; The clamping force adjustment potentiometer and the push-pull force adjustment potentiometer are electrically connected to the vehicle-mounted controller, and the vehicle-mounted controller is controllably connected to the clamp valve, the clamp relief valve, the push-pull valve, and the push-pull relief valve; The vehicle-mounted controller calculates the actual construction push-pull force based on the values of the push-pull large chamber sensor and the push-pull small chamber sensor, and automatically back-calculates the clamping pressure required by the clamp cylinder using the actual construction push-pull force. When the calculated clamping pressure is less than the pressure set by the clamping force adjustment potentiometer, the vehicle-mounted controller automatically reduces the set value of the clamp relief valve.

2. The adaptive control system for a pipe pusher with variable clamping force according to claim 1, characterized in that: The push-pull small chamber sensor is a voltage or current type pressure sensor; the push-pull small chamber sensor is installed at the piston rod end of the push-pull cylinder to monitor the pressure in the small chamber of the push-pull cylinder.

3. The adaptive control system for a pipe pusher with variable clamping force according to claim 1, characterized in that: The push-pull large chamber sensor is a voltage or current type pressure sensor; the push-pull large chamber sensor is installed at the piston end of the push-pull cylinder to monitor the pressure in the large chamber of the push-pull cylinder.

4. The adaptive control system for a pipe pusher with variable clamping force according to claim 1, characterized in that: The clamp pressure sensor is a voltage or current type pressure sensor; the clamp pressure sensor is installed at the piston end of the clamp cylinder to monitor the pressure in the large chamber of the clamp cylinder.

5. The adaptive control system for a pipe pusher with variable clamping force according to claim 1, characterized in that: The push-pull relief valve is a voltage or current type pressure control device; the push-pull relief valve is installed on the main oil path of the push-pull valve to adjust the working pressure of the push-pull cylinder.

6. The adaptive control system for a pipe pusher with variable clamping force according to claim 1, characterized in that: The clamp relief valve is a voltage or current type pressure control device; the clamp relief valve is installed on the main oil path of the clamp valve to adjust the working pressure of the clamping cylinder.

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