Inclination compensation method for spindle box

Abstract

The invention belongs to the technical field of numerical control floor type boring and milling machine spindle box balance adjustment, and provides a spindle box inclination compensation method which is characterized in that an inclination angle sensor is installed at the front end of a spindle box and used for measuring the inclination angle alpha of the spindle box, and the spindle box is connected with a balancing weight through a steel wire rope and a pulley; an oil cylinder is arranged at a front lifting point of the spindle box, a steel wire rope is connected with an oil cylinder piston, a rod cavity of the oil cylinder is connected with a port A of a proportional valve, and the proportional valve controls flow of flowing-in and flowing-out hydraulic oil to adjust the position of the piston so as to adjust the inclination angle of the spindle box. According to the spindle box inclination compensation method, automatic measurement and automatic compensation of inclination of the spindle box can be effectively achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of balancing and adjusting a spindle box of a numerically controlled floor-standing milling and boring machine, and in particular relates to a method for compensating a spindle box for tilting. Background Art

[0002] Floor-standing milling and boring machines will experience a "head-down" phenomenon during the movement of the ram, reducing the machine's operating accuracy. There are many reasons for this. One important reason is that the movement of the ram causes the center of gravity to shift, causing the spindle box to tilt horizontally.

[0003] The existing structure mostly uses a cylinder to compensate the front hanging point of the spindle box. The tool tip deformation values ​​measured at different positions of the ram extension are converted into a cylinder control pressure curve, which is achieved by adjusting the pressure through a proportional valve. However, this method has certain risks, namely, the introduction of the ram's own flexible deformation will cause excessive cylinder pressure compensation, causing the spindle box to tilt in the opposite direction, resulting in the phenomenon of guide rail extrusion, which is not conducive to the lifting and lowering of the spindle box. At the same time, this method lacks flexibility. When using different accessory heads, the pressure compensation curve must also be manually re-measured and adjusted. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of reverse extrusion of a spindle box and a column guide rail caused by conventional compensation methods, and to provide a method for compensating for the tilt of a spindle box to achieve automatic measurement and automatic compensation of the tilt of the spindle box.

[0005] The purpose of the present invention is achieved through the following technical measures.

[0006] A method for compensating the tilt of a spindle box, the method comprises installing an inclination sensor at the front end of the spindle box, the inclination sensor is used to measure the inclination angle α of the spindle box, the spindle box is connected to a counterweight block through a steel wire rope and a pulley, an oil cylinder is arranged at the front hanging point of the spindle box, the steel wire rope is connected to the oil cylinder piston, the oil cylinder has a rod cavity connected to the A port of the proportional valve, and the piston position is adjusted by controlling the flow of hydraulic oil flowing in and out through the proportional valve, thereby adjusting the inclination angle of the spindle box. The method comprises the following steps:

[0007] (1) The measured spindle box inclination angle α is determined in the PLC. When the inclination angle α>0, the front end of the spindle box tilts downward, and the built-in amplifier of the proportional valve controls the valve opening to increase the flow rate. The rod chamber pressure of the oil cylinder increases, pushing the piston rod downward. In contrast, the front end of the spindle box fixedly connected to the oil cylinder moves upward, reducing the inclination angle α of the spindle box until α=0 (within the error range);

[0008] (2) When the inclination angle α is less than 0, the front section of the spindle box tilts upward, the proportional valve overflows through the overflow port, the pressure in the rod chamber of the cylinder decreases, the piston rod moves upward, and correspondingly, the front end of the spindle box fixedly connected to the cylinder moves downward, increasing the inclination angle α of the spindle box until α=0 (within the error range).

[0009] The present invention provides a method for compensating the tilt of a spindle box. The sensor detects the horizontal state of the spindle box instead of detecting the displacement of the end of the ram. The adjustment mechanism changes the vertical position of the hanging point to achieve automatic adjustment of the tilt of the spindle box. Compared with the prior art, the method has the following beneficial effects:

[0010] 1. The degree of automation is higher. The target of compensation is not force but inclination or displacement. Automatic compensation can be achieved when the ram is installed with any accessory head. There is no need to manually measure the "lower head" data curve of the ram, identify the installed accessory head, or calculate the lifting point force. Automatic compensation of any load and any stroke can be achieved through sensors and motion mechanisms.

[0011] 2. Higher reliability, avoiding the reverse tilt of the spindle box caused by transition compensation, and ensuring the reliability of the spindle box moving up and down on the column guide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 4 is a system structure diagram of the method of the present invention.

[0013] Figure 2 It is a schematic diagram of the oil cylinder part in the present invention.

[0014] Figure 3 It is a schematic diagram of the forward tilting of the spindle box in the method of the present invention.

[0015] Figure 4 It is a control flow chart of the method of the present invention. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0017] like Figure 1 , Figure 2 , Figure 3 As shown, an embodiment of the present invention provides a method for spindle box tilt compensation, which is to install an inclination sensor 2 at the front end of the spindle box 4, and the inclination sensor 2 is used to measure the inclination angle α of the spindle box. The spindle box is connected to the counterweight block through a wire rope and a pulley, and an oil cylinder 3 is arranged at the front hanging point of the spindle box. The wire rope is connected to the oil cylinder piston, and the oil cylinder has a rod chamber connected to the A port of the proportional valve 5. The proportional valve controls the flow of hydraulic oil flowing in and out to adjust the piston position, thereby adjusting the inclination angle of the spindle box.

[0018] Control process such as Figure 4 As shown, the method comprises the following steps:

[0019] (1) The measured spindle box inclination angle α is determined in the PLC. When the inclination angle α>0, the front end of the spindle box tilts downward, and the built-in amplifier of the proportional valve controls the valve opening to increase the flow rate. The rod chamber pressure of the oil cylinder increases, pushing the piston rod downward. In contrast, the front end of the spindle box fixedly connected to the oil cylinder moves upward, reducing the inclination angle α of the spindle box until α=0 (within the error range);

[0020] (2) When the inclination angle α is less than 0, the front section of the spindle box tilts upward, the proportional valve overflows through the overflow port, the pressure in the rod chamber of the cylinder decreases, the piston rod moves upward, and correspondingly, the front end of the spindle box fixedly connected to the cylinder moves downward, increasing the inclination angle α of the spindle box until α=0 (within the error range).

[0021] The oil cylinder in the present invention is not limited to a single-rod oil cylinder, but is also applicable to a double-rod oil cylinder; the wire rope may also be a chain; the operating mechanism is not limited to the oil cylinder, but may be other moving mechanisms such as a lead screw and a worm; the method for measuring the inclination angle is not limited to an inclination sensor, but may be a displacement sensor, etc.

[0022] No matter where the ram 1 is in the stroke, or what kind of accessories are installed on the ram end face, the above control logic and control values ​​are not affected, and automatic control of the spindle box tilt can be achieved without making other changes.

[0023] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for compensating the tilt of a spindle box, characterized in that The method is to install an inclination sensor at the front end of the spindle box, the inclination sensor is used to measure the inclination angle α of the spindle box, the spindle box is connected to the counterweight block through a wire rope and a pulley, an oil cylinder is arranged at the front hanging point of the spindle box, the wire rope is connected to the oil cylinder piston, the oil cylinder has a rod cavity connected to the A port of the proportional valve, and the proportional valve is used to control the flow of hydraulic oil flowing in and out to adjust the piston position, thereby adjusting the inclination angle of the spindle box.

2. The method for compensating the tilt of a main spindle box according to claim 1, characterized in that: The method comprises the following steps: (1) The measured spindle box inclination angle α is determined in the PLC. When the inclination angle α>0, the front end of the spindle box tilts downward, and the built-in amplifier of the proportional valve controls the valve opening to increase the flow rate. The rod chamber pressure of the oil cylinder increases, pushing the piston rod downward. In contrast, the front end of the spindle box fixedly connected to the oil cylinder moves upward, reducing the inclination angle α of the spindle box until α=0; (2) When the inclination angle α is less than 0, the front section of the spindle box tilts upward, the proportional valve overflows through the overflow port, the pressure in the rod chamber of the cylinder decreases, the piston rod moves upward, and correspondingly, the front end of the spindle box fixedly connected to the cylinder moves downward, increasing the inclination angle α of the spindle box until α=0.

3. The method for compensating the tilt of a main spindle box according to claim 1, characterized in that: The oil cylinder is a single-rod oil cylinder or a double-rod oil cylinder.

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