Automatic overturning and positioning method of super-heavy numerical control overturning workbench

Abstract

The application relates to an automatic overturning and positioning method of an overweight numerical control overturning workbench, and relates to the field of machine tools.The method solves the problem that the traditional overturning workbench adopts manual installation of angle pad tooling to achieve overturning and fixed angle, which results in low machining efficiency and low machining precision, and seriously affects the production efficiency.The overturning system applied by the overturning and positioning method is composed of four parts, namely, a reference positioning angle block (1), a common angle block A (2), two common angle blocks B (3) and two supporting oil cylinder mechanisms (4).When the overturning angle needs to be changed, the two supporting oil cylinder mechanisms (4) are lifted to a certain angle, the servo oil cylinder (5) of the reference positioning angle block (1) is extended by the PLC to calculate the amount, the oil cylinder in each common angle block reaches the set pressure when the overturning angle reaches the required angle, the two supporting oil cylinder mechanisms (4) slowly fall, the hydraulic system is pressure-kept when the reference positioning angle block (1) is reached, the automatic adjustment of the overturning angle is completed, time is saved, and the efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of machine tools, and in particular to an automatic tilting and positioning method for an ultra-heavy CNC tilting worktable. Background Technology

[0002] In recent years, against the backdrop of the nation's strong advocacy for the use of clean and renewable energy, energy conservation, reduced energy consumption, and lower pollution emissions, the manufacturing of wind power equipment has entered a golden age. The efficiency of processing and manufacturing wind turbine hubs, a crucial component of wind turbine units, determines the production cycle of the wind turbine unit. Traditional tilting worktables rely on manual installation of angle shims to achieve fixed tilting angles. This manual method not only requires multiple angle shims for tilting but also results in low processing efficiency and poor precision, severely impacting production efficiency. Summary of the Invention

[0003] This invention addresses the problem in the background art where traditional rotary tables rely on manual installation of angle shims to achieve a fixed rotation angle, resulting in low processing efficiency and poor accuracy, severely impacting production productivity. Instead, it provides an automatic rotation and positioning method for heavy-duty CNC rotary tables. This method improves the working efficiency and processing accuracy of the rotary table, achieving high-precision and high-reliability automatic angle adjustment of the angle shims.

[0004] The present invention solves its problem through the following technical solution: an automatic flipping and positioning method for an ultra-heavy-duty CNC flipping worktable, comprising the following steps:

[0005] S1. Based on the initial state position, assemble the angle blocks of the flipping system; the angle blocks of the flipping system include a reference positioning angle block, a normal angle block A, and two normal angle blocks B;

[0006] S2. The flipping system also includes two support cylinder mechanisms. The two support cylinder mechanisms are assembled. The upper and lower supports of the support cylinder mechanism are fixedly connected to one end of the upper platform and the lower slide, respectively. The other ends of the upper platform and the lower slide are connected by a flipping shaft.

[0007] S3. Arrange the angle blocks and support cylinder mechanisms of the flipping system. The four angle blocks from step S1 are placed between the support cylinders of the two support cylinder mechanisms, wherein the reference positioning angle block and the ordinary angle block A are located in the middle; the two ordinary angle blocks B are located on both sides of the reference positioning angle block and the ordinary angle block A; fix the angle blocks of the flipping system to the lower slide; in the initial state, the reference positioning angle block, the ordinary angle block A, and the ordinary angle block B do not provide support.

[0008] S4. When the flipping begins, the support cylinder mechanism lifts the upper platform to a certain angle, and the two servo cylinders of the reference positioning angle block reach their respective required extensions. The difference in the extensions of the two cylinders causes the angle change of the support plate. After reaching the required angle, ordinary angle blocks A and B are lifted by the cylinders, thus reaching the positioning state.

[0009] S5. The upper platform slowly descends with the support cylinder mechanism, stopping its descent and maintaining pressure when it contacts the reference positioning angle block in the correct position, thus completing the fully automatic flipping action.

[0010] Furthermore, the reference positioning angle block in step S1 includes two servo cylinders, and the upper and lower ends of the two servo cylinders are respectively connected to the upper and lower support plates A through connecting blocks.

[0011] Furthermore, in step S1, the ordinary angle block A includes a hydraulic cylinder, and the upper and lower ends of the hydraulic cylinder are respectively connected to the upper and lower support plates A via connecting blocks; the ordinary angle block B includes a hydraulic cylinder, and the upper and lower ends of the hydraulic cylinder are respectively connected to the upper and lower support plates B via connecting blocks.

[0012] Furthermore, each support cylinder mechanism in step S2 includes two support cylinders, and each support cylinder is connected to two supports at its upper and lower ends, namely an upper support and a lower support; the support cylinder is installed between the upper support and the lower support.

[0013] Furthermore, in step S3, the upper support and the lower support are fixedly connected to one end of the upper platform and the lower slide, respectively, using screws.

[0014] Furthermore, in step S3, the lower support plates A and B of the reference positioning angle block, ordinary angle block A and ordinary angle block B are fixed to the lower slide block by wedges.

[0015] Furthermore, the method for determining the required elongation of the servo cylinder in step S4 is as follows:

[0016] A mathematical model is established to represent the position of the rotating axis relative to the initial and final positions of the servo cylinder. Based on this mathematical model, and given the current cylinder installation position, the distances from the cylinder's initial and final positions to the rotating axis can be obtained.

[0017] By using trigonometric functions, the position of the hydraulic cylinder and the angle of the rotation axis during the movement can be obtained, and then the length of the hydraulic cylinder in the final position and the length of the hydraulic cylinder in the initial position can be obtained.

[0018] The difference between the length of the cylinder in the positioned state and the length of the cylinder in the initial state is the cylinder extension.

[0019] Furthermore, the pressure-holding method for the support cylinder in step S5 is as follows: the working pressure of the support cylinder is calculated using finite element analysis technology, and the load of the entire system can be evenly relieved through the cylinder.

[0020] Furthermore, the reference positioning angle block, ordinary angle block A, ordinary angle block B, and support cylinder mechanism are connected to the PLC control system.

[0021] Furthermore, when step S4 begins to rotate, the support cylinder mechanism lifts the upper platform at a certain angle, and the two servo cylinders of the reference positioning angle block achieve their respective required elongation through PLC control.

[0022] Compared with the above-mentioned background technology, the present invention has the following beneficial effects:

[0023] This invention improves the reliability of the support for the heavy-duty CNC rotary table by using finite element analysis to calculate the working pressure of the support cylinder. The cylinder can evenly relieve the load on the entire system, ensuring support reliability and improving the rigidity of the entire system. This method can be applied to rotary tables with a load capacity of 200t.

[0024] The positioning accuracy of the ultra-heavy-duty CNC tilting worktable of this invention is ensured by mathematical model theoretical calculation and automated control servo cylinder, guaranteeing the angular positioning accuracy of its reference positioning angle block. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the angle block structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the hydraulic cylinder support mechanism of the present invention;

[0027] Figure 3 This is a schematic diagram of the overall system layout of the present invention;

[0028] Figure 4 This is a schematic diagram of the initial state position of the present invention;

[0029] Figure 5 This is a schematic diagram of the flipped state position of the present invention;

[0030] Figure 6 This is a schematic diagram illustrating the calculation of the lifting amount of the servo cylinder in this invention.

[0031] In the diagram: 1. Reference positioning angle block; 2. Ordinary angle block A; 3. Ordinary angle block B;

[0032] 4. Support cylinder mechanism; 5. Servo cylinder; 6. Connecting block; 7. Support plate; 8. Cylinder;

[0033] 9. Upper support; 10. Support cylinder; 11. Lower support; 12. Support plate B. Detailed Implementation

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, this invention discloses an automatic tilting and positioning method for a heavy-duty CNC tilting worktable. The tilting system used includes a heavy-duty CNC tilting worktable, which comprises two support cylinders 10. Each support cylinder 10 is connected to two supports at its upper and lower ends, namely an upper support 9 and a lower support 11. The support cylinders 10, upper support 9, and lower support 11 constitute a support cylinder mechanism 4. Four angle blocks are placed between the two support cylinders 10, namely a central reference positioning angle block 1, a common angle block A2, and two ordinary angle blocks B3 on either side. The upper support 9 and lower support 11 are fixedly connected to one end of an upper platform and a lower slide by screws. The other ends of the upper platform and the lower slide are connected by a tilting shaft. The reference positioning angle block 1, common angle block A2, common angle block B3, and support cylinder mechanism 4 are controlled by a PLC system, which manipulates the movement of each cylinder in the reference positioning angle block 1, common angle block A2, common angle block B3, and support cylinder mechanism 4. The specific automatic tilting and positioning method includes the following steps:

[0035] S1. As Figure 1 As shown, the angle blocks in the flipping system are assembled. The angle blocks in the flipping system include a reference positioning angle block 1, a normal angle block A2, and a normal angle block B3.

[0036] The reference positioning angle block 1 includes two servo cylinders 5, and the upper and lower ends of the two servo cylinders 5 are respectively connected to the upper and lower support plates A7 through connecting blocks 6.

[0037] The ordinary angle block A2 includes a hydraulic cylinder 8, and the upper and lower ends of the hydraulic cylinder 8 are respectively connected to two support plates A7 via connecting blocks 6;

[0038] The ordinary angle block B3 includes a hydraulic cylinder 8, and the upper and lower ends of the hydraulic cylinder 8 are respectively connected to the upper and lower support plates B12 via connecting blocks 6.

[0039] Assemble the servo cylinder 5, connecting block 6, support plate A7, support plate B12 and cylinder 8 in their initial positions to form reference positioning angle block 1, ordinary angle block A2 and ordinary angle block B3.

[0040] S2. For example Figure 2 As shown, the tilting system also includes two support cylinder mechanisms 4; each support cylinder mechanism 4 includes two support cylinders 10, and each support cylinder 10 is connected to two supports at its upper and lower ends, namely an upper support 9 and a lower support 11.

[0041] The upper support 9 and the lower support 11 are fixedly connected to the upper platform and the lower slide section respectively with screws. The other ends of the upper platform and the lower slide are connected by a flip shaft. The support cylinder 10 is installed between the upper support and the lower support.

[0042] S3. For example Figure 3 As shown, the angle blocks and supporting cylinder mechanisms of the flipping system are arranged. The four angle blocks in step S1 are placed between the supporting cylinders 10 of the two supporting cylinder mechanisms, wherein the reference positioning angle block 1 and the ordinary angle block A2 are located in the middle; the two ordinary angle blocks B3 are located on both sides of the reference positioning angle block 1 and the ordinary angle block A2; the angle blocks of the flipping system are fixedly connected to the lower slide; in the initial state, the reference positioning angle block 1, the ordinary angle block A2 and the ordinary angle block B3 do not provide support.

[0043] S4. When the flipping begins, the support cylinder mechanism 4 lifts the upper platform to a certain angle. The reference positioning angle block 1, controlled by the PLC, operates two servo cylinders 5 to achieve their respective required extensions. The difference in extension between the two cylinders creates an angle change in the support plate. Once the required angle is reached, ordinary angle blocks A2 and B3 are lifted by cylinder 8, thus reaching the correct position. Figure 4 As shown;

[0044] S5. After the reference positioning angle block 1, ordinary angle block A2, and ordinary angle block B3 reach their respective positions, the upper platform slowly descends with the support cylinder, stopping its descent and maintaining pressure when it contacts the reference positioning angle block in its final position, thus completing the fully automatic flipping action; Figure 5 As shown;

[0045] This method can be divided into two parts in terms of function. One part is to provide support. Through finite element analysis, the working pressure of the support cylinder is calculated. The cylinder can evenly relieve the load of the entire system, ensuring the reliability of the support and improving the rigidity of the entire system. The other part is to provide positioning. Through mathematical model theoretical calculation and automated control of the servo cylinder, the angular positioning accuracy of the reference positioning angle block is ensured.

[0046] The theoretical calculation method for the extension of a servo cylinder is as follows:

[0047] like Figure 4 , Figure 5 As shown, we define the center of the tilting axis of the platform and slide in the tilting worktable as point O. In the initial state, we define the positions of each point of its angle block cylinder as four points A, A', B1, and B1', as follows. Figure 4 As shown. The platform above is rotated upwards around the rotation center O until a specified angle is reached; this is called the rotated state, as shown. Figure 5As shown. Define the positions of each point. Since the positions of points A and A' do not change, define the new positions of the angle block cylinder as B2 and B2', as follows. Figure 5 As shown. Taking the calculation process of one of the cylinders as an example, we only consider AB1 in the initial state and AB2 in the final state of this cylinder, simplifying this motion model into a mathematical graph, as shown. Figure 6 As shown, point O is the rotation center, point A is the fixed point below the cylinder in the initial state, B1 is the fixed point above the cylinder in the initial state, B2 is the fixed point above the cylinder in the final state, β is the angle between OA and OB1; α is the angle between OB1 and OB2, i.e., the rotation angle; the difference between the length of AB2 and the length of AB1 is the cylinder extension s. Currently, the actual values ​​x, y, y1, and α can be obtained by measurement. Calculate the cylinder extension s.

[0048] The calculation of the cylinder elongation s includes the following steps:

[0049] 1) Given x, y, y1, and α, calculate the angle β between OA and OB1:

[0050]

[0051] 2) Given x and y1, the lengths of OB1 = OB2 = r can be derived; from angles α and β and radius r, the lengths of x2 and y2 can be derived.

[0052]

[0053] 3) Given x, y, and the length of y1, the length of x1 can be obtained using trigonometric functions:

[0054]

[0055] 4) The length L can be calculated using trigonometric functions from the lengths of x1, x2, and y2:

[0056]

[0057] 5) The final length of the elongation s is:

[0058] s = Ly

[0059] In the formula: x is the horizontal distance between the initial position of the hydraulic cylinder and the center of the tilting shaft; y is the length of the hydraulic cylinder in its initial state;

[0060] x1 is the straight-line distance between the contact point between the tilting shaft center and the lower support of the hydraulic cylinder; y1 is the vertical distance between the top of the hydraulic cylinder and the center of the tilting shaft.

[0061] x2 and y2 are the opposite and adjacent sides of the right triangle constructed with the contact point of the support and the center of the rotation axis in the position of the oil cylinder as the hypotenuse, respectively.

[0062] α is the cylinder tilting angle; β is the angle between the contact point of the upper and lower supports of the cylinder in the initial state and the straight line formed by the tilting axis.

[0063] r is the distance from the rotation axis to the contact point of the upper support of the hydraulic cylinder, which is a fixed amount, and L is the length of the hydraulic cylinder in the position.

[0064] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the implementation methods of the present invention, and should be understood that the scope of protection of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of the present invention.

Claims

1. A method for automatic tilting and positioning of an ultra-heavy-duty CNC tilting worktable, characterized in that: Includes the following steps: S1. Based on the initial state position, assemble the angle blocks in the flipping system; the angle blocks of the flipping system include a reference positioning angle block (1), a normal angle block A (2) and two normal angle blocks B (3). The reference positioning angle block (1) includes two servo cylinders (5), and the upper and lower ends of the two servo cylinders (5) are respectively connected to the upper and lower support plates A (7) through connecting blocks (6). The ordinary angle block A (2) includes a hydraulic cylinder (8), and the upper and lower ends of the hydraulic cylinder (8) are respectively connected to the upper and lower support plates A (7) through connecting blocks (6); the ordinary angle block B (3) includes a hydraulic cylinder (8), and the upper and lower ends of the hydraulic cylinder (8) are respectively connected to the upper and lower support plates B (12) through connecting blocks (6); S2. The flipping system also includes two support cylinder mechanisms (4), and the two support cylinder mechanisms (4) are assembled; the upper and lower supports of the support cylinder mechanism (4) are fixedly connected to one end of the upper platform and the lower slide, respectively, and the other end of the upper platform and the lower slide are connected by a flipping shaft; S3. Arrange the angle blocks and support cylinder mechanisms of the flipping system. The four angle blocks in step S1 are placed between the support cylinders (10) of the two support cylinder mechanisms. The reference positioning angle block (1) and the ordinary angle block A (2) are located in the middle. The two ordinary angle blocks B (3) are located on both sides of the reference positioning angle block (1) and the ordinary angle block A (2). Fix the angle blocks of the flipping system to the lower slide. In the initial state, the reference positioning angle block (1), the ordinary angle block A (2) and the ordinary angle block B (3) do not play a supporting role. S4. When the flipping begins, the support cylinder mechanism lifts the upper platform to a certain angle, and the two servo cylinders (5) of the reference positioning angle block reach their respective required extensions. The difference in the extensions of the two servo cylinders forms the angle change of the support plate. After reaching the required angle, the ordinary angle block A (2) and the ordinary angle block B (3) are lifted by the cylinder (8), thus reaching the position. S5. The upper platform slowly falls back as the support cylinder mechanism reaches the reference positioning angle block (1) in the position and stops falling and holds pressure, thus completing the fully automatic flipping action.

2. The automatic flipping and positioning method for a heavy-duty CNC flipping worktable according to claim 1, characterized in that... Step S2 Each of the support cylinder mechanisms (4) includes two support cylinders (10). Each support cylinder (10) is connected to two supports at its upper and lower ends, namely an upper support (9) and a lower support (11). The support cylinder (10) is installed between the upper support (9) and the lower support (11).

3. The automatic flipping and positioning method for a heavy-duty CNC flipping worktable according to claim 1, characterized in that... In step S3, the upper support (9) and the lower support (11) are fixedly connected to one end of the upper platform and the lower slide, respectively, using screws.

4. The automatic flipping and positioning method for a heavy-duty CNC flipping worktable according to claim 1, characterized in that... Step S3: Fix the lower support plates A (7) and B (12) of the reference positioning angle block (1), ordinary angle block A (2) and ordinary angle block B (3) to the lower slide block by means of wedges.

5. The automatic flipping and positioning method for a heavy-duty CNC flipping worktable according to claim 1, characterized in that... The method for determining the required elongation of the servo cylinder in step S4 is as follows: A mathematical model is established to represent the position of the flip axis relative to the initial state and the final state of the servo cylinder (5). Based on the established mathematical model, the current installation position of the servo cylinder is known, and the distance values ​​from the initial state and the final state of the servo cylinder to the flip axis can be obtained. By performing trigonometric function calculations, the position of the servo cylinder and the angle of the rotation axis during the motion can be obtained, and then the length of the servo cylinder in the final position and the length of the servo cylinder in the initial position can be obtained. The difference between the length of the servo cylinder in the positioned state and the length of the servo cylinder in the initial state is the extension amount of the servo cylinder.

6. The automatic tilting and positioning method for a heavy-duty CNC tilting worktable according to claim 1, characterized in that... The pressure holding method of the support cylinder (10) in step S5 is as follows: the working pressure of the support cylinder is calculated by finite element analysis technology, and the load of the entire system can be evenly relieved by the support cylinder.

7. The automatic flipping and positioning method for a heavy-duty CNC flipping worktable according to claim 1, characterized in that... The reference positioning angle block (1), ordinary angle block A (2), ordinary angle block B (3) and support cylinder mechanism (4) are connected to the PLC control system.

8. The automatic flipping and positioning method for a heavy-duty CNC flipping worktable according to claim 7, characterized in that... When step S4 begins to rotate, the support cylinder mechanism lifts the upper platform at a certain angle, and the two servo cylinders (5) of the reference positioning angle block achieve their respective required elongation through PLC control.

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