Feeding, position adjusting and conveying assembly for stamping machining of high-chromium wear-resistant castings

Abstract

The feeding position adjusting and conveying assembly comprises a rack and an air cylinder fixedly arranged at the top of the rack, a feeding table is fixedly arranged at the extending end of the air cylinder, and a temporary storage mechanism for temporarily storing and limiting the high-chromium wear-resistant castings is arranged in the middle of the upper portion of the feeding table; according to the feeding device, a feeding groove drives a casting piece to move to a feeding position on the outer side, meanwhile, a top plate moves towards one side of a pressing plate, gas in an air pressure box is extruded into a sliding cavity, four sets of position adjusting plates synchronously approach the high-chromium wear-resisting casting piece, the position of the high-chromium wear-resisting casting piece is adjusted, the accuracy of the feeding position of the high-chromium wear-resisting casting piece is ensured, and the production efficiency is improved. And then the control valve is opened, so that air in the sliding cavity and the air pressure box is discharged to the bottom of the high-chromium wear-resistant casting piece through the cooling pipe, friction heat between the high-chromium wear-resistant casting piece and the feeding table is reduced, fine impurities at the bottom of the high-chromium wear-resistant casting piece are blown off, and the stamping quality of the casting piece is improved jointly.

Description

Technical Field

[0001] The invention relates to the technical field of stamping processing of high-chromium wear-resistant castings, and more specifically to a feed positioning and conveying component for stamping processing of high-chromium wear-resistant castings. Background Art

[0002] High chromium wear-resistant castings are widely used in many industrial fields due to their excellent wear resistance, such as concrete machinery, mining equipment, metallurgical equipment, etc. For the stamping processing of such castings, the design of the feed positioning and conveying components is very important, which directly affects the efficiency of the stamping process and the quality of the castings;

[0003] Therefore, the application of clip-type loaders in stamping machine tools has gradually attracted attention and has become an important equipment on the stamping production line. Clip-type loaders can quickly and accurately complete the storage and transportation of materials, bid farewell to the traditional manual loading method, and greatly improve production efficiency;

[0004] However, in the process of conveying and feeding high-chromium wear-resistant castings, friction will occur between the casting at the bottom and the feeding table in the current clip-type feeder. In the long run, the surface temperature of the feeding table will increase. When conveying the castings, friction heat is easily generated on the surface of the castings, resulting in fine cracks. It is also impossible to avoid cracks or scratches on the surface of the high-chromium wear-resistant casting sheet, which greatly affects the stamping quality. At the same time, before the castings enter the stamping die, it is difficult to adjust the position of the castings to ensure the accuracy of the feeding position and jointly improve the stamping quality.

[0005] In view of the above technical defects, a solution is now provided. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a feed positioning and conveying assembly for stamping processing of high-chromium wear-resistant castings.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a feed position adjustment and conveying assembly for stamping processing of high-chromium wear-resistant castings, comprising a frame and a cylinder fixedly arranged on the top thereof, a feed table fixedly arranged at the extended end of the cylinder, a temporary storage mechanism for temporarily storing and limiting the high-chromium wear-resistant castings is arranged in the middle above the feed table, and an adjustment mechanism for adjusting the feed position of the high-chromium wear-resistant castings is arranged on the other side above the feed table;

[0008] The positioning mechanism comprises a feed trough opened above the feed table, a limiter is arranged at the bottom of the feed trough, and an air pressure box is fixedly arranged on the bottom wall of the feed table;

[0009] The limiting member includes four sliding cavities opened on the inner wall of the feed table, and the four sliding cavities are evenly distributed around the feed trough. A piston plate 2 is slidably arranged inside the sliding cavity, and a movable rod 2 is fixedly arranged on the side wall of the piston plate 2. The end of the movable rod 2 movably penetrates into the feed trough and is fixedly provided with a positioning plate.

[0010] Furthermore, a piston plate 1 is slidably disposed inside the air pressure box, a movable rod 1 is fixedly disposed on the side wall of the piston plate 1, and the end of the movable rod 1 movably penetrates to the outside of the air pressure box and is fixedly disposed with a top plate.

[0011] Furthermore, a thrust spring is sleeved on the outer wall of the movable rod located outside the air pressure box.

[0012] Furthermore, a pressing plate is provided on one side of the top plate, and the lower part of the pressing plate is connected to the frame via a fixing plate.

[0013] Furthermore, an air inlet pipe and a flushing pipe are arranged on the side wall of the air pressure box, and a one-way valve is arranged on the outer wall of the air inlet pipe and the flushing pipe.

[0014] Furthermore, a cooling pipe is provided on the side wall of the air pressure box, a control valve is provided on the outer wall of the cooling pipe, a cooling port is opened on the outer wall of the feed table, and the output end of the cooling pipe is arranged toward the cooling port.

[0015] Furthermore, a thrust spring 2 is sleeved on the outer wall of the movable rod 2, and the thrust spring 2 is located in the sliding cavity, and the sliding cavity is connected to the output end of the punch pipe through a connecting pipe.

[0016] Furthermore, two groups of symmetrically arranged L-plates are slidably arranged above the frame, a transverse plate is slidably arranged on the top of the L-plate, and a side limiting plate 1 is fixedly arranged at opposite ends of the two transverse plates.

[0017] Furthermore, connecting plates are fixedly installed on both side ends of the side limit plate one, a threaded rod is threadedly arranged on the outer wall of the connecting plate, and the end of the threaded rod is rotatably connected to the side limit plate two through a bearing, and the side limit plate two is located inside the side limit plate one.

[0018] Furthermore, connecting heads are fixedly provided on both sides of the side limit plate 1, and a bidirectional threaded screw is threadedly connected between the two connecting heads located on the same straight line. Both ends of the bidirectional threaded screw are rotatably connected to support plates through bearings, and a turntable is provided at the end of the bidirectional threaded screw.

[0019] Technical effects and advantages of the present invention:

[0020] 1. The present invention moves the high chromium wear-resistant casting sheet to the outer loading position by extending the extended end of the cylinder. At the same time, the top plate moves to one side of the pressing plate, so that the top plate pushes the movable rod 1 inward, and the movable rod 1 pushes the piston plate 1 outward, so that the gas inside the air pressure box is squeezed into the punch pipe, and enters the sliding cavity through the connecting pipe along the punch pipe, and pushes the piston plate 2 outward, so that the four groups of adjustment plates are synchronously moved closer to the high chromium wear-resistant casting sheet, thereby completing the adjustment of the position of the high chromium wear-resistant casting sheet, ensuring the accuracy of its feeding position, and improving the stamping quality.

[0021] 2. The present invention opens the control valve so that the gas inside the sliding cavity and the air pressure box is completely discharged to the bottom of the high-chromium wear-resistant casting through the cooling pipe, thereby reducing the friction heat between it and the feed table and blowing off the fine impurities at the bottom of the high-chromium wear-resistant casting, avoiding cracks or scratches on the surface of the high-chromium wear-resistant casting, which affects the stamping quality. At the same time, the four sets of adjustment plates are reset synchronously, which is convenient for the subsequent processing and stamping of the high-chromium wear-resistant casting inside the feed trough.

[0022] 3. In the present invention, by controlling the synchronous rotation of the two turntables, the two side limit plates 1 are driven to move synchronously together, and then the threaded rod is controlled to rotate to move the side limit plate 2 inward, so that the area of ​​the temporary storage area can be adjusted, and the temporary storage and feeding of high-chromium wear-resistant castings of various sizes can be realized, thereby improving the versatility and practicality of the device when used. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional diagram of the appearance of the overall structure of the present invention.

[0024] Figure 2 It is a three-dimensional diagram of the temporary storage mechanism in the present invention.

[0025] Figure 3 It is a top view of the overall structure of the present invention.

[0026] Figure 4 It is a cross-sectional view of the overall structure of the present invention.

[0027] Figure 5 It is a three-dimensional diagram of the positioning mechanism in the present invention.

[0028] Figure 6 It is a three-dimensional diagram of the limiting member in the present invention.

[0029] Figure 7 It is a side view of the overall structure of the present invention.

[0030] The accompanying drawings are marked as follows: 1. feeding table; 2. frame; 3. cylinder; 4. temporary storage mechanism; 41. side limit plate 1; 42. connecting head; 43. bidirectional threaded screw; 44. supporting plate; 45. L plate; 46. horizontal plate; 47. connecting plate; 48. side limit plate 2; 49. threaded rod; 5. adjusting mechanism; 51. feeding trough; 52. air pressure box; 53. piston plate 1; 54. pressing plate; 55. movable rod 1; 56. top plate; 57. limiting member; 571. connecting pipe; 572. adjusting plate; 573. sliding chamber; 574. piston plate 2; 575. movable rod 2; 58. flushing pipe; 59. intake pipe; 510. cooling pipe. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1: Figure 1-7 As shown, a feed position adjustment and conveying assembly for stamping processing of high chromium wear-resistant castings proposed in this embodiment includes a frame 2 and a cylinder 3 fixedly arranged on the top thereof, a feed table 1 is fixedly arranged at the extended end of the cylinder 3, a temporary storage mechanism 4 for temporarily storing and limiting the high chromium wear-resistant castings is arranged in the middle above the feed table 1, and an adjustment mechanism 5 for adjusting the feed position of the high chromium wear-resistant castings is arranged on the other side above the feed table 1; the frame 2 plays a supporting role;

[0033] like Figure 4-7 As shown, the positioning mechanism 5 includes a feed trough 51 opened above the feed table 1, a limiting member 57 is arranged at the bottom of the feed trough 51, a pressure box 52 is fixedly arranged on the bottom wall of the feed table 1, a piston plate 53 is slidably arranged inside the pressure box 52, a movable rod 55 is fixedly arranged on the side wall of the piston plate 53, the end of the movable rod 55 is movably penetrated to the outside of the pressure box 52 and a top plate 56 is fixedly arranged, and a thrust spring is sleeved on the outer wall of the movable rod 55 outside the pressure box 52;

[0034] It should be noted that the volume of the feed trough 51 is larger than the volume of the high chromium wear-resistant casting, so as to ensure that the high chromium wear-resistant casting can enter the feed trough 51;

[0035] like Figure 4-7As shown, a pressing plate 54 is provided on one side of the top plate 56, and the bottom of the pressing plate 54 is connected to the frame 2 through a fixing plate; the top plate 56 moves toward one side of the pressing plate 54, so that the top plate 56 pushes the movable rod 1 55 inward, and the movable rod 1 55 pushes the piston plate 1 53 outward, squeezing the gas inside the air pressure box 52 into the flushing pipe 58;

[0036] like Figure 4-5 As shown, an air inlet pipe 59 and a flushing pipe 58 are provided on the side wall of the air pressure box 52, and a one-way valve is provided on the outer wall of the air inlet pipe 59 and the flushing pipe 58; the gas enters the sliding cavity 573 through the connecting pipe 571 along the flushing pipe 58, and pushes the second piston plate 574 outward, so that the four groups of adjustment plates 572 are synchronously moved closer to the high chromium wear-resistant casting sheet, thereby completing the adjustment of the position of the high chromium wear-resistant casting sheet, ensuring the accuracy of its feeding position, and improving the stamping quality;

[0037] It should be noted that when the top plate 56 no longer presses the pressing plate 54, the outside air enters the interior of the air pressure box 52 through the air inlet pipe 59, and presses the piston plate 53 to one side to reset; and air holes are opened on the side wall of the air pressure box 52, such as Figure 6 As shown, the air hole exists to facilitate the reciprocating movement of the piston plate 53 inside the air pressure box 52;

[0038] like Figure 4-5 As shown, a cooling pipe 510 is also provided on the side wall of the air pressure box 52, and the input end of the cooling pipe 510 is connected to the input end of the flushing pipe 58 through a connecting pipe, and a control valve is provided on the outer wall of the cooling pipe 510, and a cooling port is opened on the outer wall of the feed table 1, and the cooling port is located below the casting, and the output end of the cooling pipe 510 is arranged toward the cooling port;

[0039] The control valve is immediately opened, so that the gas inside the sliding cavity 573 and the air pressure box 52 is all discharged to the bottom of the high chromium wear-resistant casting through the cooling pipe 510, reducing the friction heat between it and the feeding table 1 and blowing away the fine impurities at the bottom of the high chromium wear-resistant casting to avoid affecting the stamping quality;

[0040] like Figure 4-5 As shown, the limiting member 57 includes four sliding cavities 573 opened on the inner wall of the feed table 1, and the four sliding cavities 573 are evenly distributed around the feed trough 51. A piston plate 574 is slidably arranged inside the sliding cavity 573, and a movable rod 575 is fixedly arranged on the side wall of the piston plate 574. The end of the movable rod 575 is movable and penetrates into the feed trough 51 and is fixedly arranged with a positioning plate 572; a thrust spring 572 is sleeved on the outer wall of the movable rod 575, and the thrust spring 572 is located in the sliding cavity 573;

[0041] It should be noted that when the gas is discharged through the cooling tube 510, the thrust spring 2 pushes the piston plate 2 574 outward, so that the movable rod 2 575 is reset, thereby realizing the reset of the adjustment plate 572; therefore, when the suction cup on the robot arm moves to the top of the feed trough 51, it is not limited by the four sets of adjustment plates 572, and the high chromium wear-resistant casting sheet can be transferred to the stamping die for stamping;

[0042] like Figure 4-6 As shown, the sliding chamber 573 is connected to the output end of the flushing tube 58 through a connecting pipe 571 ; four groups of connecting pipes 571 are provided to transport the gas to the interior of the sliding chamber 573 .

[0043] Embodiment 2: Figure 1-4 As shown in Figures 7 and 8, a feed adjustment and conveying assembly for stamping processing of high chromium wear-resistant castings proposed in this embodiment is improved on the basis of Example 1, two groups of symmetrically arranged L plates 45 are slidably arranged above the frame 2, a cross plate 46 is slidably arranged on the top of the L plate 45, and a side limit plate 41 is fixedly arranged at the opposite ends of the two cross plates 46, and the cross section of the side limit plate 41 is U-shaped;

[0044] It should be supplemented here that: a slide rail is provided at the bottom of the L-plate 45, and a slide bar is slidably provided inside the slide rail, and the slide bar is fixedly connected to the top wall of the feed table 1; when the feed table 1 is extended and contracted with the extended end of the cylinder 3, it plays a role in limiting the feed table, thereby improving the stability of its movement;

[0045] like Figure 1-4 As shown, connecting plates 47 are fixedly installed at both ends of the side limit plate 1 41, and threaded rods 49 are threadedly arranged on the outer wall of the connecting plate 47. The ends of the threaded rods 49 are rotatably connected to the side limit plate 2 48 through bearings. The side limit plate 2 48 is located inside the side limit plate 1 41;

[0046] like Figure 1-4 As shown, connectors 42 are fixedly provided on both sides of the side limit plate 1 41, and a bidirectional threaded screw 43 is threadedly connected between the two connectors 42 located on the same straight line, and both ends of the bidirectional threaded screw 43 are rotatably connected to support plates 44 through bearings, and a turntable is provided at the end of the bidirectional threaded screw 43; friction patterns are provided on the surface of the turntable for increasing friction, and the rotation of the bidirectional threaded screw 43 can be controlled by controlling the rotation of the turntable;

[0047] Then, the two turntables are controlled to rotate synchronously, driving the two side limit plates 41 to move synchronously together, and then, the threaded rod 49 is controlled to rotate to move the side limit plate 48 inward, so that the spacing between the high chromium wear-resistant casting and the side limit plates 41 and 48 is about 1 mm, which is convenient for the active feeding of the high chromium wear-resistant casting; the existence of a spacing of about 1 mm can reduce the friction between the high chromium wear-resistant casting and the side limit plates 41 and 48, and avoid scratches on the high chromium wear-resistant casting;

[0048] In this embodiment, by controlling the synchronous rotation of the two turntables, the two side limit plates 41 are driven to move together synchronously, and then the threaded rod 49 is controlled to rotate to move the side limit plate 48 inward, so that the area of ​​the temporary storage area can be adjusted to achieve temporary storage and feeding of high-chromium wear-resistant castings of various sizes, thereby improving the versatility and practicality of the device when used;

[0049] It should be noted that: the side limit plate 1 41 and the side limit plate 2 48 form a temporary storage area for temporarily storing high chromium wear-resistant castings to facilitate feeding;

[0050] It can be known from the present invention in combination with the first and second embodiments that: as the extended end of the cylinder 3 extends, the feed trough 51 drives the high chromium wear-resistant casting sheet to move to the outer loading position, and at the same time, the top plate 56 moves to one side of the pressing plate 54, squeezing the gas inside the air pressure box 52 into the punch pipe 58, and entering the sliding cavity 573 along the punch pipe 58 through the connecting pipe 571, pushing the second piston plate 574 outward, so that the four groups of adjustment plates 572 are synchronously moved closer to the high chromium wear-resistant casting sheet, completing the adjustment of the position of the high chromium wear-resistant casting sheet, and ensuring the accuracy of its feeding position;

[0051] Subsequently, the control valve is opened so that the gas inside the sliding cavity 573 and the air pressure box 52 is all discharged to the bottom of the high-chromium wear-resistant casting through the cooling pipe 510, reducing the friction heat between it and the feed table 1 and blowing off the fine impurities at the bottom of the high-chromium wear-resistant casting, thereby jointly improving the stamping quality of the high-chromium wear-resistant casting. When the high-chromium wear-resistant casting is cooled, the four sets of adjustment plates 572 are reset synchronously, which is convenient for the feeding transfer of the high-chromium wear-resistant casting inside the feed trough 51.

[0052] The working process of the present invention is as follows:

[0053] Step 1: Adjust the temporary storage area according to the size of the high chromium wear-resistant casting: control the synchronous rotation of the two turntables to drive the two side limit plates 41 to move together synchronously, then control the threaded rod 49 to rotate to move the side limit plate 48 inward, so that the spacing between the high chromium wear-resistant casting and the side limit plate 41 and the side limit plate 48 is about 1 mm, and then the area of ​​the temporary storage area can be adjusted to achieve temporary storage and feeding of high chromium wear-resistant castings of various sizes, thereby improving the versatility and practicality of the device when used;

[0054] Step 2: stack multiple pieces of high chromium wear-resistant castings into the temporary storage area, and the extended end of the cylinder 3 shrinks. When the feed trough 51 moves to the inside of the temporary storage area, the high chromium wear-resistant casting piece enters the temporary storage area. As the extended end of the cylinder 3 stretches, the feed trough 51 moves to the outside. At the same time, the top plate 56 moves to one side of the pressing plate 54, so that the top plate 56 pushes the movable rod 1 55 inward, and the movable rod 1 55 pushes the piston plate 1 53 outward, squeezing the gas inside the air pressure box 52 into the punch pipe 58, and along the punch pipe 58 through the connecting pipe 571 into the sliding cavity 573, pushing the piston plate 2 574 outward, so that the four groups of adjustment plates 572 are synchronously moved close to the high chromium wear-resistant casting piece, thereby completing the adjustment of the position of the high chromium wear-resistant casting piece, ensuring the accuracy of its feeding position, and improving the stamping quality;

[0055] Step 3: Then, immediately open the control valve so that the gas inside the sliding cavity 573 and the air pressure box 52 is all discharged to the bottom of the high chromium wear-resistant casting through the cooling pipe 510, reducing the friction heat between it and the feed table 1 and blowing off the fine impurities at the bottom of the high chromium wear-resistant casting to avoid cracks or scratches on the surface of the high chromium wear-resistant casting, which affects the stamping quality; then transfer the high chromium wear-resistant casting above the feed trough 51 to the top of the stamping die through an external mechanical arm to complete the stamping;

[0056] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A feed positioning and conveying assembly for stamping high-chromium wear-resistant castings, comprising a frame (2) and a cylinder (3) fixedly arranged on the top thereof, wherein a feed table (1) is fixedly arranged on the extended end of the cylinder (3), characterized in that: A temporary storage mechanism (4) for temporarily storing and limiting the high-chromium wear-resistant casting is arranged in the middle part above the feeding platform (1), and a positioning mechanism (5) for adjusting the feeding position of the high-chromium wear-resistant casting is arranged on the other side above the feeding platform (1); The positioning mechanism (5) comprises a feed trough (51) opened above the feed platform (1), a limiter (57) is arranged at the bottom of the feed trough (51), and an air pressure box (52) is fixedly arranged on the bottom wall of the feed platform (1); The limiting member (57) includes four sliding cavities (573) opened on the inner wall of the feed platform (1), and the four sliding cavities (573) are evenly distributed around the feed trough (51). A piston plate 2 (574) is slidably arranged inside the sliding cavity (573), and a movable rod 2 (575) is fixedly arranged on the side wall of the piston plate 2 (574). The end of the movable rod 2 (575) is movably inserted into the feed trough (51) and is fixedly provided with a positioning plate (572).

2. The feed position adjustment and conveying assembly for stamping of high chromium wear-resistant castings according to claim 1, characterized in that: A piston plate (53) is slidably disposed inside the air pressure box (52), a movable rod (55) is fixedly disposed on the side wall of the piston plate (53), and the end of the movable rod (55) is movably penetrated to the outside of the air pressure box (52) and is fixedly disposed with a top plate (56).

3. The feed position adjustment and conveying assembly for stamping high chromium wear-resistant castings according to claim 2 is characterized in that: The movable rod 1 (55) is sleeved with a thrust spring on its outer wall outside the air pressure box (52).

4. The feed position adjustment and conveying assembly for stamping of high chromium wear-resistant castings according to claim 2, characterized in that: A pressing plate (54) is provided on one side of the top plate (56), and the lower part of the pressing plate (54) is connected to the frame (2) via a fixing plate.

5. The feed position adjustment and conveying assembly for stamping high chromium wear-resistant castings according to claim 1, characterized in that: An air inlet pipe (59) and a flushing pipe (58) are arranged on the side wall of the air pressure box (52), and a one-way valve is arranged on the outer wall of the air inlet pipe (59) and the flushing pipe (58).

6. The feed position adjustment and conveying assembly for stamping high chromium wear-resistant castings according to claim 1, characterized in that: A cooling pipe (510) is also provided on the side wall of the air pressure box (52); the input end of the cooling pipe (510) and the input end of the flushing pipe (58) are connected via a connecting pipe; a control valve is provided on the outer wall of the cooling pipe (510); a cooling port is provided on the outer wall of the feed platform (1); and the output end of the cooling pipe (510) is arranged toward the cooling port.

7. The feed position adjustment and conveying assembly for stamping high chromium wear-resistant castings according to claim 1, characterized in that: A thrust spring 2 is sleeved on the outer wall of the second movable rod (575), and the thrust spring 2 is located in the sliding cavity (573), and the sliding cavity (573) is connected to the output end of the punching tube (58) through a connecting tube (571).

8. The feed position adjustment and conveying assembly for stamping high chromium wear-resistant castings according to claim 1, characterized in that: Two groups of symmetrically arranged L-plates (45) are slidably arranged above the frame (2), a transverse plate (46) is slidably arranged on the top of the L-plate (45), and a side limiting plate (41) is fixedly arranged at opposite ends of the two transverse plates (46).

9. The feed position adjustment and conveying assembly for stamping high chromium wear-resistant castings according to claim 8, characterized in that: The two side ends of the side limit plate 1 (41) are fixedly mounted with connecting plates (47), the outer wall of the connecting plate (47) is threadedly provided with a threaded rod (49), the end of the threaded rod (49) is rotatably connected to the side limit plate 2 (48) through a bearing, and the side limit plate 2 (48) is located inside the side limit plate 1 (41).

10. The feed position adjustment and conveying assembly for stamping high chromium wear-resistant castings according to claim 9, characterized in that: Connecting heads (42) are fixedly provided on both sides of the side limit plate (41); a bidirectional threaded screw (43) is threadedly connected between the two connecting heads (42) located on the same straight line; both ends of the bidirectional threaded screw (43) are rotatably connected to support plates (44) via bearings; and a rotating disk is provided at the end of the bidirectional threaded screw (43).

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