Workpiece clamping device for large machine tool

Abstract

The utility model relates to the technical field of machine tool machining, and discloses a workpiece clamping device for a large machine tool, which comprises a concave base, the top of the base is fixedly connected with a placing plate for placing a tubular workpiece, and a left-right axial rotating rod is arranged in the base. The two sides of the rotating rod are each provided with two symmetrical clamping plates, the tops of the clamping plates extend to the position above the containing plate, the two clamping plates can rotate in the opposite directions to clamp workpieces, and two pressing blocks capable of ascending and descending are arranged above the containing plate. According to the clamping device, a tubular workpiece needing to be clamped can be placed on the surface of the placing plate, the surface of the tubular workpiece can be clamped through opposite rotation of the two corresponding clamping plates, then the positions of the two pressing blocks can descend, and the tubular workpiece is pressed on the placing plate; at the moment, the two sides of the tubular workpiece are in three-point contact through the corresponding pressing blocks and the two clamping plates, the clamping and fixing effect is achieved, and the fixing mode can be compatible with workpieces of different diameter specifications for use.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tool processing, in particular to a workpiece clamping device for large machine tools. Background Art

[0002] When using large machine tools to process pipes / columnar workpieces, in order to ensure processing accuracy, large pipes need to be accurately positioned on the machine tool. The use of clamping devices can ensure that the workpiece is in the correct position, making the cutting or processing operation precise and controllable.

[0003] The current clamping device is used to accurately clamp and position the pipe fittings. The clamping part is designed according to the surface shape of the pipe fitting so that it fits the curved surface of the pipe fitting. However, this also makes it impossible to apply tubular workpieces of different diameters. The staff needs to replace different clamping parts to adapt to the workpieces to be processed. The compatibility is not ideal. Therefore, it is necessary to design a clamping device for workpieces for large machine tools to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a workpiece clamping device for a large machine tool, which is used to solve the technical problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a clamping device for workpieces for large machine tools, comprising a concave base, a placement plate for placing tubular workpieces fixedly connected to the top of the base, a left-right axial rotating rod provided in the base, two symmetrical clamping plates with tops extending above the placement plate are arranged on both sides of the rotating rod, the two clamping plates can rotate towards each other to clamp the workpiece, and two liftable pressure blocks are arranged above the placement plate.

[0006] Preferably, mounting blocks 1 are fixedly connected to both sides of the bottom of the placement plate, and mounting block 2 is fixedly connected to the center of the bottom of the placement plate. The rotating rod includes an inner rod rotatably connected between the two mounting blocks 1 and an outer rod sleeved on the inner rod, and the outer rod is connected to the mounting block 2 through a bearing.

[0007] Preferably, among the four splints, two of them are fixedly connected to the left and right sides of the inner rod respectively, and the other two splints are fixedly connected to the left and right sides of the outer rod respectively, and a rotating mechanism for rotating the inner rod and the outer rod in opposite directions is provided on the placement plate.

[0008] Preferably, the rotating mechanism includes two annular plates, which are respectively sleeved on one side of the inner rod and the outer rod, and the two annular plates are symmetrical on the left and right. The two sides of the two annular plates facing each other are fixedly connected with end face gears. The bottom of the placement plate is rotatably provided with a bevel gear meshing between the two end face gears, and a driving member for driving the bevel gear to rotate is provided on the placement plate.

[0009] Preferably, the driving member comprises a servo motor fixedly mounted on the bottom of the placement plate, and the end of the output shaft of the servo motor is fixed to the end face of the bevel gear.

[0010] Preferably, the top of the placement plate is provided with two left-right symmetrical strip grooves running through it along its width direction, and the top of each clamping plate runs through the placement plate through the strip grooves.

[0011] Preferably, two mounting frames in an inverted L-shaped structure are fixedly connected to one side of the base, and a servo electric cylinder with a piston rod facing downward is fixedly installed on the top of the two mounting frames, and two pressure blocks are respectively fixedly connected to the ends of the piston rods of the servo electric cylinders.

[0012] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0013] The utility model can place a tubular workpiece that needs to be clamped on the surface of a placement plate, and the surface of the tubular workpiece can be clamped by rotating two corresponding clamping plates toward each other, and then the positions of the two pressing blocks can be lowered to press the tubular workpiece against the placement plate. At this time, both sides of the tubular workpiece are in three-point contact with the corresponding pressing blocks and the two clamping plates, thereby achieving a clamping and fixing effect, and this fixing method is compatible with workpieces of different diameters and specifications, and has better applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic cross-sectional view of the structure of the utility model;

[0016] Figure 3 It is a schematic side view of the structure of the utility model;

[0017] Figure 4 It is a partial structural schematic diagram of the utility model;

[0018] In the figure: 1. base; 2. placement plate; 3. rotating rod; 31. inner rod; 32. outer rod; 4. clamping plate; 5. pressure block; 6. mounting block 1; 7. mounting block 2; 8. annular plate; 9. end face gear; 10. bevel gear; 11. servo motor; 12. strip groove; 13. mounting frame; 14. servo electric cylinder. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] Obviously, many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0021] See also Figure 1-4 The utility model provides a clamping device for a workpiece of a large machine tool, comprising a concave base 1, a placement plate 2 for placing a tubular workpiece is fixedly connected to the top of the base 1, and a rotating rod 3 in a left-right axial direction is provided in the base 1. Two clamping plates 4 that are symmetrical and extend to the top of the placement plate 2 are arranged on both sides of the rotating rod 3. The two clamping plates 4 can rotate towards each other to clamp the workpiece, and two liftable pressing blocks 5 are arranged above the placement plate 2. Through such a design, the tubular workpiece to be clamped can be placed on the surface of the placement plate 2 so that its two sides are respectively located between the two corresponding clamping plates 4, and then the surface of the tubular workpiece can be clamped by rotating the two corresponding clamping plates 4 towards each other, and then the position of the two pressing blocks 5 can be lowered and the tubular workpiece is pressed tightly on the placement plate 2. That is to say, at this time, the two sides of the tubular workpiece are contacted at three points by the corresponding pressing blocks 5 and the two clamping plates 4, so as to achieve the effect of clamping and fixing, and this fixing method can be compatible with workpieces of different diameters and specifications, and has better applicability.

[0022] The specific connection method between the rotating rod 3 and the placement plate 2 is as follows: mounting blocks 6 are fixedly connected to both sides of the bottom of the placement plate 2, and a mounting block 2 7 is fixedly connected to the center of the bottom of the placement plate 2. The rotating rod 3 includes an inner rod 31 rotatably connected between the two mounting blocks 6 and an outer rod 32 sleeved on the inner rod 31, and the outer rod 32 is connected to the mounting block 2 7 through a bearing, so that the inner rod 31 and the outer rod 32 can be in a coaxial state, and the inner rod 31 and the outer rod 32 both form a rotational connection at the bottom of the placement plate 2.

[0023] In order to enable the two clamping plates 4 to rotate towards each other, among the four clamping plates 4, two of the clamping plates 4 are respectively fixedly connected to the left and right sides of the inner rod 31, and the other two clamping plates 4 are respectively fixedly connected to the left and right sides of the outer rod 32. A rotating mechanism for rotating the inner rod 31 and the outer rod 32 in opposite directions is provided on the placement plate 2, so that the inner rod 31 will drive the two clamping plates 4 on its surface to rotate, and the outer rod 32 will also drive the two clamping plates 4 on its surface to rotate, so that the two corresponding clamping plates 4 will rotate towards each other with the inner rod 31 / outer rod 32 as the axis, so as to achieve the purpose of clamping the pipe workpiece.

[0024] Specifically, the rotating mechanism includes two annular plates 8, which are respectively sleeved on one side of the inner rod 31 and the outer rod 32, and the two annular plates 8 are symmetrical on the left and right. The two sides of the two annular plates 8 facing each other are fixedly connected with end face gears 9. The bottom of the placement plate 2 is rotatably provided with a bevel gear 10 meshing between the two end face gears 9, and the placement plate 2 is provided with a driving member for driving the bevel gear 10 to rotate. When rotating, the bevel gear 10 can drive the two end face gears 9 to rotate through tooth matching. At this time, the two annular plates 8 will rotate in opposite directions, and make the inner rod 31 and the outer rod 32 rotate synchronously, so that the two front and rear corresponding clamping plates 4 can rotate towards / oppositely and realize the clamping / release of the workpiece.

[0025] The specific method of driving the bevel gear 10 to rotate is as follows Figure 3 and Figure 4 As shown, the driving member includes a servo motor 11 fixedly mounted on the bottom of the placement plate 2, and the end of the output shaft of the servo motor 11 is fixed to the end face of the bevel gear 10. When the output shaft of the servo motor 11 rotates, the bevel gear 10 can be driven to rotate, so that the bevel gear 10 can drive the inner rod 31 and the outer rod 32 to rotate in opposite directions.

[0026] See also Figure 1 The top of the placing plate 2 is provided with two symmetrical strip grooves 12 running through it along its width direction, and the top of each clamping plate 4 passes through the placing plate 2 through the strip groove 12, so that the clamping plate 4 can contact with the workpiece on the surface of the placing plate 2 to achieve the purpose of clamping it.

[0027] It should be noted that two mounting frames 13 in an inverted L-shaped structure are fixedly connected to one side of the base 1, and a servo electric cylinder 14 with a piston rod facing downward is fixedly installed on the top of the two mounting frames 13. Two pressure blocks 5 are respectively fixedly connected to the ends of the piston rods of the servo electric cylinders 14. When the piston rods of the servo electric cylinders 14 are extended or retracted, the pressure blocks 5 can be driven to change their height positions, so that the pressure blocks 5 can be pressed down to contact the surface of the tubular workpiece, and cooperate with the two clamps 4 to form a three-point contact with the workpiece, thereby achieving a stable clamping effect.

[0028] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0029] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0030] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A workpiece clamping device for a large machine tool, comprising a concave base (1), characterized in that: A placement plate (2) for placing a tubular workpiece is fixedly connected to the top of the base (1), and a left-right axial rotating rod (3) is provided inside the base (1). Two clamping plates (4) are symmetrically arranged on both sides of the rotating rod (3) and the tops of the clamping plates (4) extend above the placement plate (2). The two clamping plates (4) can rotate towards each other to clamp the workpiece, and two liftable pressing blocks (5) are arranged above the placement plate (2).

2. A workpiece clamping device for a large machine tool according to claim 1, characterized in that: Both sides of the bottom of the placement plate (2) are fixedly connected to mounting blocks 1 (6), and the center of the bottom of the placement plate (2) is fixedly connected to mounting block 2 (7). The rotating rod (3) comprises an inner rod (31) rotatably connected between the two mounting blocks 1 (6) and an outer rod (32) sleeved on the inner rod (31), and the outer rod (32) is connected to the mounting block 2 (7) through a bearing.

3. A workpiece clamping device for a large machine tool according to claim 2, characterized in that: Among the four clamping plates (4), two clamping plates (4) are respectively fixedly connected to the left and right sides of the inner rod (31), and the other two clamping plates (4) are respectively fixedly connected to the left and right sides of the outer rod (32). A rotating mechanism for rotating the inner rod (31) and the outer rod (32) in opposite directions is provided on the placement plate (2).

4. A workpiece clamping device for a large machine tool according to claim 3, characterized in that: The rotating mechanism comprises two annular plates (8), the two annular plates (8) are respectively sleeved on one side of the inner rod (31) and the outer rod (32), and the two annular plates (8) are bilaterally symmetrical, and the two annular plates (8) are fixedly connected with end face gears (9) on the opposite sides thereof, and a bevel gear (10) meshing between the two end face gears (9) is rotatably arranged at the bottom of the placement plate (2), and a driving member for driving the bevel gear (10) to rotate is arranged on the placement plate (2).

5. A workpiece clamping device for a large machine tool according to claim 4, characterized in that: The driving member comprises a servo motor (11) fixedly mounted on the bottom of the placement plate (2), and the output shaft end of the servo motor (11) is fixed to the end surface of the bevel gear (10).

6. A workpiece clamping device for a large machine tool according to claim 1, characterized in that: The top of the placement plate (2) is provided with two left-right symmetrical strip grooves (12) along its width direction and penetrated through the placement plate (2), and the top of each clamping plate (4) penetrates the placement plate (2) through the strip groove (12).

7. A workpiece clamping device for a large machine tool according to claim 1, characterized in that: Two mounting frames (13) in an inverted L-shaped structure are fixedly connected to one side of the base (1), and a servo electric cylinder (14) with a piston rod facing downward is fixedly installed on the top of the two mounting frames (13), and two pressure blocks (5) are respectively fixedly connected to the ends of the piston rods of the servo electric cylinder (14).

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