Rotational balancing mechanism of numerically controlled cradle turntable and its debugging method

Abstract

The present invention relates to a rotary balancing mechanism of a numerically controlled cradle turntable, and the structure thereof is as follows: a balancing flange is fixedly connected to the outer circumference of the end of the cradle turntable rotating shaft, and a lower connecting shaft is arranged on the balancing flange; a fixed bracket is connected to the side surface of the cradle base, and an upper connecting shaft is arranged on the top of the fixed bracket, the cylinder seat of the balancing oil cylinder is coaxially matched with the upper connecting shaft through a bearing, and the piston rod of the balancing oil cylinder is connected and matched with the lower connecting shaft through a joint bearing; the oil port of the balancing oil cylinder is connected to two accumulators through a four-way joint, and the four-way joint is connected to a hydraulic control unit. The rotary balancing mechanism of the numerically controlled cradle turntable adopts a closed-loop hydraulic unit composed of a leak-free reversing valve and an accumulator, so that the rotating shaft of the numerically controlled turntable is subjected to a balancing force moment, and the force-bearing condition is ideal, thereby ensuring high-speed rotation, high dynamics, high rotation accuracy, and energy saving and power saving of the turntable.

Description

Technical Field

[0001] The invention relates to a rotary balancing mechanism of a numerically controlled cradle turntable and a debugging method thereof, belonging to the technical field of machine tool supporting equipment. Background Art

[0002] The existing rotational balancing mechanism of a CNC cradle turntable and its debugging method are specifically a mechanism that can always maintain an opposite torque and the torque changes with the change of the center of gravity of the rotating part of the turntable to accurately balance the weight of the rotating part of the CNC cradle turntable. This mechanism not only plays a precise balancing role, but even if the center of gravity reverses during the rotation of the turntable, causing the rotating part of the turntable to generate an opposite torque on the rotation axis, this balancing mechanism will instantly follow the torque generated in the opposite direction to accurately balance the weight of the rotating part of the turntable at all times.

[0003] At present, the rotation balancing mechanism of the CNC cradle turntable and the rotation balancing mechanism used in the debugging method thereof are usually a hydraulic balancing valve type hydraulic reversing balancing mechanism to balance the weight of the rotating part of the CNC cradle turntable. This balancing mechanism will cause hydraulic hysteresis in the rotation reversing of the turntable and slow following speed, thereby affecting the dynamics and rotation accuracy of the turntable; especially for the high-speed rotating CNC cradle turntable, the hydraulic flow demand is large and the following speed requirement is fast. The hydraulic reversing balancing mechanism of the hydraulic balancing valve type is far from meeting the requirements of such harsh working conditions, and the balancing effect is not ideal, and it may even have a counterproductive effect. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a rotation balancing mechanism of a CNC cradle turntable and a debugging method thereof. The rotation balancing mechanism of the CNC cradle turntable adopts a closed-loop hydraulic unit composed of a leakage-free reversing valve and an accumulator, so that the rotating axis of the CNC turntable is subjected to a balancing force moment, and the force working conditions are ideal, thereby ensuring high-speed rotation, high dynamics, high rotation accuracy, and energy saving of the turntable.

[0005] In order to solve the above problems, the specific technical solutions of the present invention are as follows: a rotating balancing mechanism of a CNC cradle turntable, a balancing flange is fixedly connected to the outer circumference of the end of the cradle turntable shaft, and a lower connecting shaft is provided on the balancing flange; a fixed bracket is connected to the side surface of the cradle base, and an upper connecting shaft is provided on the top of the fixed bracket, the cylinder seat of the balancing cylinder is coaxially matched with the upper connecting shaft through a bearing, and the piston rod of the balancing cylinder is connected to the lower connecting shaft through a joint bearing; the oil port of the balancing cylinder is connected to two accumulators through a four-way joint, and the four-way joint is connected to the hydraulic control unit.

[0006] The structure of the hydraulic control unit is as follows: an oil inlet pipe is connected to an oil inlet, an oil outlet of a first leak-free reversing valve is connected to a pressure reducing valve and a first one-way valve in sequence, an oil outlet of the first one-way valve is connected to a first oil outlet of a four-way joint, two accumulators are connected together and then connected to a second oil outlet of the four-way joint; a third oil outlet of the four-way joint is connected to an oil outlet of a second leak-free reversing valve, an oil inlet and outlet pipe of a balancing oil cylinder is connected to a fourth oil outlet of the four-way joint, and an oil return port of the pressure reducing valve and an oil return port of the second leak-free reversing valve are connected to an oil outlet pipe.

[0007] A first pressure switch is connected to the pipeline between the outlet of the first one-way valve and the outlet of the second non-leakage reversing valve.

[0008] The pipeline between the accumulator and the balancing oil cylinder is connected in sequence with a second one-way valve and a second pressure switch.

[0009] An adjusting gasket is arranged between the fixing bracket and the side surface of the cradle turntable, and the adjusting gasket is connected to the cradle turntable via screws.

[0010] The debugging method of the rotation balancing mechanism of the above-mentioned numerically controlled cradle turntable comprises the following steps:

[0011] 1) Automatically open the first non-leakage reversing valve and the second non-leakage reversing valve;

[0012] 2) Calculate the center of gravity change curve of the cradle turntable according to the load weight of the cradle turntable;

[0013] 3) The applied pressure value of the balance cylinder is obtained according to the center of gravity change curve; and the input pressure value is adjusted through the pressure reducing valve;

[0014] 4) The first non-leakage reversing valve and the second non-leakage reversing valve are automatically closed, and the pressure oil is stored or released in the two accumulators. During the rotation of the cradle turntable, the expansion and contraction of the balancing cylinder and the swing of the balancing flange generate a constantly changing torque, thereby achieving the effect of balancing the cradle turntable.

[0015] The rotary balancing mechanism of the CNC cradle turntable adopts the above structure and has the following advantages:

[0016] 1. The use of a balancing cylinder structure can provide constant following and accurate matching of the reverse torque. This reverse torque accurately balances the rotational torque generated by the rotating parts of the CNC cradle turntable, thereby improving the high dynamic characteristics of the CNC cradle turntable;

[0017] 2. When the CNC cradle turntable reciprocates, the center of gravity changes all the time, and there is a reversing problem at 0°. The rotating balance mechanism can instantly follow the reversing by relying on its own structure, solving the technical problem of hydraulic reversing hysteresis and improving the rotation accuracy of the turntable;

[0018] 3. The hydraulic unit that provides the pressure oil for the balancing cylinder is of a sealed, leak-free design, and does not require the hydraulic pump to supply oil for a long time. This solves the technical problem of rapid oil replenishment of the balancing system when the turntable rotates at high speed, ensures high-speed rotation of the turntable, and can achieve energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall connection diagram of the rotary balancing mechanism of the CNC cradle turntable.

[0020] Figure 2 This is the application diagram of the rotating balancing mechanism of the CNC cradle turntable on the cradle mechanism.

[0021] Figure 3 for Figure 2 A local enlarged view of location I.

[0022] Figure 4 This is the hydraulic schematic diagram of the hydraulic control unit.

[0023] Figure 5 Schematic diagram of the balanced working state of the rotary balancing mechanism.

[0024] Figure 6 Schematic diagram of torque balance of the rotary balancing mechanism. DETAILED DESCRIPTION

[0025] like Figures 1 to 3 As shown, a rotary balancing mechanism of a CNC cradle turntable has the following structure: a balancing flange 32 is fixedly connected to the outer circumference of the end of the cradle turntable shaft 30, and a lower connecting shaft 34 is provided on the balancing flange 32; a fixed bracket 26 is connected to the side surface of the cradle base 31, and an upper connecting shaft 22 is provided on the top of the fixed bracket 26; the cylinder seat of the balancing cylinder 21 is coaxially matched with the upper connecting shaft 22 through a bearing 23, and the piston rod of the balancing cylinder 21 is connected to the lower connecting shaft 34 through a joint bearing 35; the oil port of the balancing cylinder 21 is connected to two accumulators 9 through a four-way joint 18, and the four-way joint 18 is connected to the hydraulic control unit 1.

[0026] like Figure 4As shown, the structure of the hydraulic control unit 1 is as follows: the oil inlet pipe 15 is connected to the oil inlet, the oil outlet of the first leak-free reversing valve 11 is connected to the pressure reducing valve 13 and the first one-way valve 14 in sequence, the oil outlet of the first one-way valve 14 is connected to the first oil port of the four-way joint 18, and the two accumulators 9 are connected together and then connected to the second oil port of the four-way joint 18; the third oil port of the four-way joint 18 is connected to the oil outlet of the second leak-free reversing valve 12, the inlet and outlet pipes of the balancing cylinder 21 are connected to the fourth oil port of the four-way joint 18, and the oil return port of the pressure reducing valve 13 and the oil return port of the second leak-free reversing valve 12 are connected to the oil outlet pipe 16. The balancing mechanism of the present application can adapt to different balancing weights by adjusting the pressure of the pressure reducing valve 13 or the position of the balancing cylinder, share the load of the driving motor, save energy and have strong adaptability; by accurately controlling the size of the hydraulic pressure, the size of the output force of the balancing cylinder can be accurately controlled, and the balancing accuracy is high; the balancing structure and the installation position solve the technical problem of the center of gravity reversal during the rotation of the turntable, and greatly improve the dynamic performance and rotation accuracy of the turntable; the closed hydraulic accumulator oil supply unit can continue to supply oil for a long time after the hydraulic pump supplies oil once, which can save energy and electricity. The rotating balancing mechanism of the CNC cradle turntable can be used on any cradle-type CNC turntable, so its application on the CNC cradle turntable has unique technical advantages.

[0027] The first pressure switch 17 is connected to the pipeline between the outlet of the first check valve 14 and the outlet of the second non-leakage reversing valve 12. The second check valve 19 and the second pressure switch 20 are connected in sequence to the pipeline between the accumulator 9 and the balancing oil cylinder 21. The first pressure switch 17 and the second pressure switch 20 are used to monitor the pipeline hydraulic pressure in real time.

[0028] An adjusting washer 27 is provided between the fixing bracket 26 and the side surface of the cradle turntable, and the adjusting washer 27 is connected to the cradle turntable by screws to ensure the verticality of the fixing bracket 26 .

[0029] The rotary balancing mechanism of the numerical control cradle turntable and the debugging method thereof include the following steps:

[0030] 1) Automatically open the first non-leakage reversing valve 11 and the second non-leakage reversing valve 12;

[0031] 2) Calculate the center of gravity change curve of the cradle turntable according to the load weight of the cradle turntable;

[0032] 3) The applied pressure value of the balancing cylinder 21 is obtained according to the center of gravity change curve; and the input pressure value is adjusted through the pressure reducing valve 13;

[0033] 4) The first non-leakage reversing valve 11 and the second non-leakage reversing valve 12 are automatically closed, and the pressure oil is stored or released in the two accumulators 9. During the rotation of the cradle turntable, the expansion and contraction of the balancing cylinder 21 and the swing of the balancing flange generate a constantly changing torque, thereby achieving the effect of balancing the cradle turntable.

[0034] like Figure 5 and Figure 6 As shown, when the cradle turntable rotates within the range of ±130°, the accumulator constantly provides a certain amount of pressure oil to the balancing cylinder, and the cylinder rod generates a directional thrust and a balancing torque opposite to the torque generated by the rotating center of gravity of the turntable, and maintains the opposite balancing torque at all times, and is not affected by the reversal of the center of gravity at zero position when the turntable rotates, thereby achieving the purpose of accurately balancing the weight of the rotating part of the turntable.

Claims

1. A rotary balancing mechanism for a numerically controlled cradle turntable, characterized in that: A balancing flange (32) is fixedly connected to the outer circumference of the end of the cradle turntable shaft (30), and a lower connecting shaft (34) is provided on the balancing flange (32); a cradle base (31) fixedly connected to the machine tool bed is provided on the outer circumference of the cradle turntable shaft (30), the side surface of the cradle base (31) is connected to a fixed bracket (26), and an upper connecting shaft (22) is provided on the top of the fixed bracket (26); the cylinder seat of the balancing oil cylinder (21) is coaxially matched with the upper connecting shaft (22) through a bearing (23), and the piston rod of the balancing oil cylinder (21) is connected to the lower connecting shaft (34) through a joint bearing (35); the oil port of the balancing oil cylinder (21) is connected to two accumulators (9) through a four-way joint (18), and the four-way joint (18) is connected to a hydraulic control The hydraulic control unit (1) has the following structure: an oil inlet pipe (15) is connected to an oil inlet of a first leak-free reversing valve (11); an oil outlet of the first leak-free reversing valve (11) is connected to a pressure reducing valve (13) and a first check valve (14) in sequence; an oil outlet of the first check valve (14) is connected to a first oil outlet of a four-way joint (18); two accumulators (9) are connected together and then connected to a second oil outlet of the four-way joint (18); a third oil outlet of the four-way joint (18) is connected to an oil outlet of a second leak-free reversing valve (12); an oil inlet and outlet pipe of a balancing oil cylinder (21) is connected to a fourth oil outlet of the four-way joint (18); and an oil return port of the pressure reducing valve (13) and an oil return port of the second leak-free reversing valve (12) are connected to an oil outlet pipe (16).

2. The rotary balancing mechanism of the numerically controlled cradle turntable according to claim 1, characterized in that: A first pressure switch (17) is connected to the pipeline between the outlet of the first one-way valve (14) and the outlet of the second non-leakage reversing valve (12).

3. The rotary balancing mechanism of the numerically controlled cradle turntable according to claim 1, characterized in that: The pipeline between the accumulator (9) and the balancing oil cylinder (21) is connected in sequence to a second one-way valve (19) and a second pressure switch (20).

4. The rotary balancing mechanism of the numerically controlled cradle turntable according to claim 1, characterized in that: An adjustment gasket (27) is provided between the fixing bracket (26) and the side surface of the cradle turntable, and the adjustment gasket (27) is connected to the cradle turntable via screws.

5. The method for debugging the rotational balancing mechanism of the numerically controlled cradle turntable according to claim 1, characterized in that The following steps are involved: 1) Automatically opening the first non-leakage reversing valve (11) and the second non-leakage reversing valve (12); 2) Calculate the center of gravity change curve of the cradle turntable according to the load weight of the cradle turntable; 3) The applied pressure value of the balancing oil cylinder (21) is obtained according to the center of gravity change curve; and the input pressure value is adjusted through the pressure reducing valve (13); 4) The first non-leakage reversing valve (11) and the second non-leakage reversing valve (12) are automatically closed, and the pressure oil is stored or released in the two accumulators (9). During the rotation of the cradle turntable, the expansion and contraction of the balancing cylinder (21) and the swing of the balancing flange generate a constantly changing torque, thereby achieving the effect of balancing the cradle turntable.

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