A plastic part nozzle cutting device

Abstract

The present invention relates to the field of sprue cutting, and in particular to a sprue cutting device for plastic parts, including an injection mold assembly, wherein the injection mold assembly includes a mounting plate, a guide rail is fixed on the mounting plate, a fixed mold is commonly fixed at the top end of the guide rail, a movable mold is slidably connected to the guide rail, a mold opening cylinder is fixedly connected to the bottom of the mounting plate, and the output shaft of the mold opening cylinder is fixedly connected to the bottom of the movable mold, and also includes a sprue cutting assembly, the sprue cutting assembly includes a U-shaped frame fixed on one side of the fixed mold, a three-stage telescopic hydraulic cylinder, a suction device, a clamping assembly and a sprue cutting assembly, a sprue cutting fixture for carrying plastic parts is installed at one end of the bottom of the U-shaped frame, and the plastic part sprue cutting device integrates the injection mold assembly and the sprue cutting assembly, and realizes full automation from injection completion to sprue cutting through the coordinated work of the mold opening cylinder and the three-stage telescopic hydraulic cylinder, thereby greatly improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of nozzle cutting, and in particular to a nozzle cutting device for plastic parts. Background Art

[0002] When cutting the sprue of a plastic part, the injection mold must first be opened, the molded part manually placed on a cutting jig, and then a punching cylinder drives a punching tool to cut off the sprue. Finally, the plastic part, with the sprue removed, must be manually removed from the cutting jig. This results in low work efficiency and poses certain safety risks.

[0003] Therefore, we propose a plastic part nozzle cutting device to solve the above problems. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a plastic part nozzle cutting device.

[0005] The present invention provides a plastic part nozzle cutting device, which includes an injection mold assembly, wherein the injection mold assembly includes a mounting plate, a guide rail is fixed on the mounting plate, the top of the guide rail is jointly fixed with a fixed mold, a movable mold is slidably connected to the guide rail, the bottom of the mounting plate is fixedly connected to a mold opening cylinder, the output shaft of the mold opening cylinder is fixedly connected to the bottom of the movable mold, and also includes a nozzle cutting assembly, the nozzle cutting assembly includes a U-shaped frame fixed to one side of the fixed mold, a three-stage telescopic hydraulic cylinder, a suction device, a clamping assembly and a nozzle cutting assembly, one end of the bottom of the U-shaped frame is installed with a nozzle cutting fixture for carrying plastic parts, a three-stage telescopic hydraulic cylinder is installed on the top of the U-shaped frame, the third-stage piston rod of the three-stage telescopic hydraulic cylinder is installed with a suction device for removing the plastic part from the movable mold, the second-stage piston rod of the telescopic hydraulic cylinder is installed with a clamping assembly for fixing the plastic part on the nozzle cutting fixture, and the first-stage piston rod of the telescopic hydraulic cylinder is installed with a nozzle cutting assembly for cutting off the nozzle of the plastic part.

[0006] Preferably, the suction device includes an L-shaped frame fixed on the third-stage piston rod, a first slide bar is slidably connected to the L-shaped frame, a pneumatic suction cup is installed at one end of the first slide bar, a cross bar is integrally fixed to the bottom end of the L-shaped frame, both ends of the cross bar are slidably connected to the second slide bar, the second slide bar and one end of the first slide bar are jointly fixedly connected to a triangular plate, a first magnet is fixed in the triangular plate, a second magnet cooperating with the first magnet is installed on the U-shaped frame, a third magnet is fixed at the end of the second slide bar, and a fourth magnet cooperating with the third magnet is fixed on the movable mold.

[0007] Preferably, an ear plate is fixed to one end of the bottom of the U-shaped frame, a rotating shaft is rotatably connected to the ear plate, the water cutting fixture is fixed to one end of the rotating shaft, and a unloading device for driving the rotating shaft to rotate is installed at the bottom of the cross bar.

[0008] Preferably, the unloading device includes a rack fixed at the bottom of the cross bar, and a gear meshing with the rack is fixed on the rotating shaft. During the downward movement of the third-stage piston rod, the rack is meshed with the gear, so the water cutting fixture will rotate along the rotating shaft. The rack has only one section with teeth. When the rack drives the gear to rotate by an angle, there are no teeth on the rack to continue to mesh with the gear.

[0009] Preferably, a waste discharge channel for waste material from the drain outlet is provided in the water cutting fixture.

[0010] Preferably, the clamping assembly includes a pressing cylinder, the top of which is fixedly connected to the second-stage piston rod, the bottom of which is open, the bottom edge of which cooperates with the plastic part, the second-stage piston rod of the three-stage telescopic hydraulic cylinder moves downward, and the pressing cylinder presses the edge of the plastic part and fixes it on the water cutting fixture.

[0011] Preferably, the water outlet cutting assembly includes an L-shaped cutting knife fixed to the end of the first-stage piston rod, and the water outlet is cut by the L-shaped cutting knife.

[0012] Preferably, the side wall of the pressing cylinder is provided with an avoidance notch for avoiding the L-shaped cutting knife, so as to avoid the L-shaped cutting knife.

[0013] Preferably, a slide groove is provided inside the rack, a fixing rod is fixed on the U-shaped frame, and the fixing rod is slidably connected in the slide groove, so that the rack moves more smoothly.

[0014] Preferably, the water cut fixture is stepped, and the circumference of the side wall of one end of the water cut fixture that cooperates with the plastic part is smaller than the circumference of the side wall of the other end, thereby supporting the bottom of the plastic part.

[0015] Preferably, the water cutting jig is stepped, and the circumference of the side wall of one end of the water cutting jig that cooperates with the plastic part is smaller than the circumference of the side wall of the other end, an anti-rotation rod is fixed to the side wall of the rotating shaft, and an anti-rotation plane is provided at the end of the anti-rotation rod, and a blocking plate that cooperates with the anti-rotation plane is fixed on the rack. Before the third-stage piston rod moves downward, the water cutting jig is in an inverted state. During the downward movement of the third-stage piston rod, the water cutting jig will rotate along the rotating shaft due to the meshing connection between the rack and the gear. The rack has only one section with teeth. When the rack drives the gear to rotate 180 degrees, there are no teeth on the rack to continue to mesh with the gear. At this time, the part where the water cutting jig cooperates with the plastic part is set upward, and the anti-rotation plane is flush with the side of the blocking plate. As the rack continues to move, the anti-rotation plane contacts the blocking plate, and the rotating shaft will not rotate.

[0016] Workflow:

[0017] First, after the injection molding is completed, the mold opening cylinder drives the movable mold to move downward. At this time, the plastic part is located on the movable mold and moves downward with the movable mold. When the fourth magnet moves to face the third magnet, due to the strong attraction between the fourth magnet and the third magnet, the triangle plate, the second slide bar, the first slide bar and the pneumatic suction cup move closer to the movable mold together. When the pneumatic suction cup contacts the plastic part, the pneumatic suction cup sucks the plastic part. As the movable mold continues to move downward, the plastic part is separated from the movable mold.

[0018] Next, the three-stage telescopic hydraulic cylinder starts to work. The third-stage piston rod of the three-stage telescopic hydraulic cylinder moves downward first. When the triangle plate moves to the position facing the second magnet, an attraction is generated between the first magnet and the second magnet. At this time, the triangle plate, the second slide bar, the first slide bar, the pneumatic suction cup and the plastic part move toward the second magnet together. When the fourth magnet contacts the cross bar, the plastic part will not continue to move toward the second magnet. At this time, the plastic part is located directly above the water cutting fixture. As the plastic part continues to descend, when the third-stage piston rod extends to the limit position, the lower half of the plastic part The third stage piston rod just fits on the water cutting fixture (before the third stage piston rod moves downward, the water cutting fixture is in an inverted state. During the downward movement of the third stage piston rod, the rack is engaged with the gear, so the water cutting fixture will rotate along the shaft. The rack has only one section with teeth. When the rack drives the gear to rotate 180 degrees, there are no teeth on the rack to continue to engage with the gear. At this time, the part of the water cutting fixture that cooperates with the plastic part is set upward, and the anti-rotation plane is flush with the side of the blocking plate. As the rack continues to move, the anti-rotation plane contacts the blocking plate, and the shaft will not rotate).

[0019] Subsequently, the fixed mold and the movable mold are re-closed through the mold opening cylinder. Due to the obstruction of the sprue fixture, the pneumatic suction cup will not move horizontally. The suction between the pneumatic suction cup and the plastic part is released through the pneumatic suction cup, and the plastic part is completely covered on the sprue fixture under the action of gravity.

[0020] Then, the second-stage piston rod of the three-stage telescopic hydraulic cylinder moves downward, and the pressing cylinder presses the edge of the plastic part tightly and fixes it on the water cutting fixture.

[0021] Then, the first-stage piston rod of the three-stage telescopic hydraulic cylinder moves downward, and the L-shaped cutting knife cuts off the water outlet, and the cut water outlet is discharged along the waste discharge channel.

[0022] Finally, the three-stage telescopic hydraulic cylinder contracts to drive the reset of each part. When the third-stage piston rod contracts, the water cutting fixture rotates 180 degrees to remove the plastic parts from the water cutting fixture.

[0023] Repeat the above steps.

[0024] Compared with the related art, the present invention has the following beneficial effects:

[0025] High degree of automation: The device integrates the injection mold components and the sprue cutting components. Through the coordinated work of the mold opening cylinder and the three-stage telescopic hydraulic cylinder, it realizes the full automation from injection completion to sprue cutting, greatly improving production efficiency.

[0026] High safety: no manual intervention is required, avoiding harm to workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 Schematic diagram of the structure of the injection mold assembly of the present invention;

[0029] Figure 3 This is a schematic structural diagram of the nozzle cutting assembly of the present invention;

[0030] Figure 4 Schematic diagram of the rack structure of the present invention;

[0031] Figure 5 Schematic diagram of the relative position of the first magnet of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the three-stage telescopic hydraulic cylinder of the present invention.

[0033] Figure 7 This is a structural diagram of the plastic part of the present invention before the nozzle is removed.

[0034] Numbers in the figure: 1. Injection mold assembly; 2. Mounting plate; 3. Guide rail; 4. Fixed mold; 5. Moving mold; 6. Mold opening cylinder; 7. Water nozzle cutting assembly; 8. U-shaped frame; 9. Three-stage telescopic hydraulic cylinder; 10. Suction device; 11. Clamping assembly; 12. Water nozzle assembly; 13. Water nozzle fixture; 14. Third-stage piston rod; 15. Second-stage piston rod; 16. First-stage piston rod; 17. L-shaped frame; 18. First slide rod; 19. Pneumatic suction cup ; 20. Cross bar; 21. Second slide bar; 22. Triangle plate; 23. First magnet; 24. Second magnet; 25. Third magnet; 26. Fourth magnet; 27. Ear plate; 28. Rotating shaft; 29. ​​Unloading device; 30. Rack; 31. Gear; 32. Waste discharge channel; 33. Press cylinder; 34. L-shaped cutting knife; 35. Avoidance gap; 36. Slide groove; 37. Fixed rod; 38. Anti-rotation rod; 39. Anti-rotation plane; 40. Blocking plate. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Please refer to Figures 1 to 7 , a plastic part nozzle cutting device, the core component of which includes an injection mold assembly 1. The construction of the injection mold assembly 1 starts with a mounting plate 2, which firmly supports a guide rail 3, and the top of the guide rail 3 jointly fixes the fixed mold 4. On the guide rail 3, the movable mold 5 is installed in a sliding connection so that it can move along the guide rail 3. In order to drive the opening and closing of the movable mold 5, a mold opening cylinder 6 is fixedly connected to the bottom of the mounting plate 2, and the output shaft of the cylinder is directly connected to the bottom of the movable mold 5, thereby realizing the automatic opening and closing of the mold.

[0037] Furthermore, the device cleverly incorporates a nozzle cutting assembly 7, a particularly complex and comprehensive component. A U-shaped frame 8 is fixed to one side of the fixed mold 4, providing a stable support platform for subsequent cutting operations. Atop the U-shaped frame 8 is a three-stage telescopic hydraulic cylinder 9, a highly flexible and powerful drive mechanism. A suction device 10 is mounted on the third-stage piston rod 14 of the hydraulic cylinder. This device enables the plastic part to be quickly and accurately removed from the mold after the movable mold 5 is opened.

[0038] The design of the suction device 10 is equally ingenious. It is connected to the third-stage piston rod 14 via an L-shaped frame 17. A first slide bar 18 is slidably connected to the L-shaped frame 17, and a pneumatic suction cup 19 is installed at one end of the slide bar for sucking plastic parts. At the same time, a crossbar 20 is fixed to the bottom end of the L-shaped frame 17. The two ends of the crossbar 20 are slidably connected to a second slide bar 21. These slide bars and one end of the first slide bar 18 are connected to a triangular plate 22. The triangular plate 22 is embedded with a first magnet 23, which cooperates with the second magnet 24 on the U-shaped frame 8 to ensure the stability of the suction device 10 during movement. The end of the second slide bar 21 is fixed with a third magnet 25, which cooperates with the fourth magnet 26 on the movable mold 5, further enhancing the firmness of the suction device 10 when sucking plastic parts.

[0039] At the bottom of the U-shaped frame 8, there is fixed an ear plate 27, which is rotatably connected to the rotating shaft 28, and the water cutting fixture 13 is fixed to one end of the rotating shaft 28. In order to automate unloading, a unloading device 29 is installed at the bottom of the cross bar 20, which includes a rack 30 fixed to the bottom of the cross bar 20, and a gear 31 fixed to the rotating shaft 28. When the third-stage piston rod 14 moves downward, the meshing connection between the rack 30 and the gear 31 will drive the water cutting fixture 13 to rotate along the rotating shaft 28, thereby realizing automatic unloading of the plastic parts. It is worth noting that the rack 30 has teeth only on one section. After the rack 30 drives the gear 31 to rotate 180 degrees, there are no teeth on the rack 30 to continue to mesh with the gear 31, thereby ensuring the accuracy and stability of the unloading action.

[0040] The water-cutting jig 13 also features a waste channel 32 for discharging waste generated during the cutting process. A clamping assembly 11 is mounted on the hydraulic cylinder's second-stage piston rod 15. This assembly includes a pressure cylinder 33, whose bottom edge engages the plastic part. When the second-stage piston rod 15 moves downward, the pressure cylinder 33 presses the edge of the plastic part firmly against the water-cutting jig 13.

[0041] Finally, an L-shaped cutter 34 is fixed to the end of the first-stage piston rod 16, forming the core of the sprue cutter assembly 12. As the first-stage piston rod 16 of the hydraulic cylinder moves downward, the L-shaped cutter 34 precisely cuts the sprue of the plastic part. To ensure a smooth cutting process, the sidewall of the pressing cylinder 33 is provided with an escape notch 35 to allow the L-shaped cutter 34 to pass through.

[0042] In addition, in order to enhance the stability of the rack 30 movement, a slide groove 36 is provided inside the rack 30, and a fixing rod 37 is fixed on the U-shaped frame 8. The fixing rod 37 is slidably connected in the slide groove 36, thereby ensuring the stability of the rack 30 during movement.

[0043] It is worth mentioning that the design of the water cutting fixture 13 is also quite ingenious. It is stepped, and the circumference of the side wall of one end of the water cutting fixture 13 that cooperates with the plastic part is smaller than the circumference of the side wall of the other end. This design not only facilitates the placement and fixation of the plastic part, but also can provide stable support for the bottom of the plastic part.

[0044] Preferably, the water cut fixture 13 is stepped, and the circumference of the side wall of one end of the water cut fixture 13 that cooperates with the plastic part is smaller than the circumference of the side wall of the other end. The side wall of the rotating shaft 28 is fixed with an anti-rotation rod 38, and the end of the anti-rotation rod 38 is provided with an anti-rotation plane 39. The rack 30 is fixed with a blocking plate 40 that cooperates with the anti-rotation plane 39. Before the third-stage piston rod 14 moves downward, the water cut fixture 13 is in an inverted state. During the process of the third-stage piston rod 14 moving downward, the water cut fixture 13 is in an inverted state. In the figure, since the rack 30 is meshed with the gear 31, the water cutting fixture 13 will rotate along the rotating shaft 28. The rack 30 has only one section with teeth. When the rack 30 drives the gear 31 to rotate 180 degrees, there are no teeth on the rack 30 to continue to mesh with the gear 31. At this time, the part of the water cutting fixture 13 that cooperates with the plastic part is set upward, and the anti-rotation plane 39 is flush with the side of the blocking plate 40. As the rack 30 continues to move, the anti-rotation plane 39 contacts the blocking plate 40, and the rotating shaft 28 will not rotate.

[0045] Workflow:

[0046] First, after the injection molding is completed, the mold opening cylinder 6 drives the movable mold 5 to move downward. At this time, the plastic part is located on the movable mold 5 and moves downward with the movable mold 5. When the fourth magnet 26 moves to a position opposite to the third magnet 25, due to the strong attraction between the fourth magnet 26 and the third magnet 25, the triangular plate 22, the second slide bar 21, the first slide bar 18 and the pneumatic suction cup 19 approach the movable mold 5 together. When the pneumatic suction cup 19 contacts the plastic part, the plastic part is sucked by the pneumatic suction cup 19. As the movable mold 5 continues to move downward, the plastic part is separated from the movable mold 5.

[0047] Next, the three-stage telescopic hydraulic cylinder 9 starts to work, and the third-stage piston rod 14 of the three-stage telescopic hydraulic cylinder 9 moves downward first. When the triangular plate 22 moves to face the second magnet 24, an attraction is generated between the first magnet 23 and the second magnet 24. At this time, the triangular plate 22, the second slide bar 21, the first slide bar 18, the pneumatic suction cup 19 and the plastic part move together toward the second magnet 24. When the fourth magnet 26 contacts the cross bar 20, the plastic part will not continue to move toward the second magnet 24. At this time, the plastic part is located directly above the water cutting fixture 13. As the plastic part continues to descend, when the third-stage piston rod 14 extends to the limit position, the lower half of the plastic part just fits in. On the water cut fixture 13 (before the third-stage piston rod 14 moves downward, the water cut fixture 13 is in an inverted state. During the downward movement of the third-stage piston rod 14, since the rack 30 is engaged with the gear 31, the water cut fixture 13 will rotate along the rotating shaft 28. The rack 30 has only one section with teeth. When the rack 30 drives the gear 31 to rotate 180 degrees, there are no teeth on the rack 30 that continue to engage with the gear 31. At this time, the part of the water cut fixture 13 that cooperates with the plastic part is set upward, and the anti-rotation plane 39 is flush with the side of the blocking plate 40. As the rack 30 continues to move, the anti-rotation plane 39 contacts the blocking plate 40, and the rotating shaft 28 will not rotate).

[0048] Subsequently, the fixed mold 4 and the movable mold 5 are re-closed through the mold opening cylinder 6. Due to the obstruction of the water cutting fixture 13, the pneumatic suction cup 19 will not move horizontally. The suction between the pneumatic suction cup 19 and the plastic part is released through the pneumatic suction cup 19, and the plastic part is completely covered on the water cutting fixture 13 under the action of gravity.

[0049] Then, the second-stage piston rod 15 of the three-stage telescopic hydraulic cylinder 9 moves downward, and the pressing cylinder 33 presses the edge of the plastic part tightly and fixes it on the water cutting fixture 13.

[0050] Then, the first-stage piston rod 16 of the three-stage telescopic hydraulic cylinder 9 moves downward, and the L-shaped cutting knife 34 cuts off the water outlet, and the cut water outlet is discharged along the waste discharge channel 32.

[0051] Finally, the three-stage telescopic hydraulic cylinder 9 is contracted to drive the reset of each component. When the third-stage piston rod 14 is contracted, the water cut fixture 13 rotates 180 degrees to remove the plastic part from the water cut fixture 13.

[0052] Repeat the above steps.

[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for cutting a nozzle of a plastic part, comprising an injection mold assembly (1), wherein the injection mold assembly (1) comprises a mounting plate (2), a guide rail (3) is fixed on the mounting plate (2), a fixed mold (4) is fixed to the top of the guide rail (3), a movable mold (5) is slidably connected to the guide rail (3), a mold opening cylinder (6) is fixedly connected to the bottom of the mounting plate (2), and an output shaft of the mold opening cylinder (6) is fixedly connected to the bottom of the movable mold (5), characterized in that: The invention also includes a nozzle cutting assembly (7), which includes a U-shaped frame (8) fixed on one side of the fixed mold (4), a three-stage telescopic hydraulic cylinder (9), a suction device (10), a pressing assembly (11) and a nozzle cutting assembly (12), wherein a nozzle cutting fixture (13) for carrying plastic parts is installed at one end of the bottom of the U-shaped frame (8), a three-stage telescopic hydraulic cylinder (9) is installed at the top of the U-shaped frame (8), a suction device (10) for removing the plastic part from the movable mold (5) is installed on the third-stage piston rod (14) of the three-stage telescopic hydraulic cylinder (9), a pressing assembly (11) for fixing the plastic part on the nozzle cutting fixture (13) is installed on the second-stage piston rod (15) of the telescopic hydraulic cylinder (9), and a nozzle cutting assembly (12) for cutting the nozzle of the plastic part is installed on the first-stage piston rod (16) of the telescopic hydraulic cylinder (9).

2. A plastic part nozzle cutting device according to claim 1, characterized in that: The suction device (10) includes an L-shaped frame (17) fixed on the third-stage piston rod (14), a first slide bar (18) is slidably connected in the L-shaped frame (17), one end of the first slide bar (18) is installed with a pneumatic suction cup (19), the bottom end of the L-shaped frame (17) is integrally fixed with a cross bar (20), both ends of the cross bar (20) are slidably connected with a second slide bar (21), the second slide bar (21) and one end of the first slide bar (18) are fixedly connected with a triangular plate (22), a first magnet (23) is fixed in the triangular plate (22), a second magnet (24) matched with the first magnet (23) is installed on the U-shaped frame (8), a third magnet (25) is fixed at the end of the second slide bar (21), and a fourth magnet (26) matched with the third magnet (25) is fixed on the movable mold (5).

3. A plastic part nozzle cutting device according to claim 2, characterized in that: An ear plate (27) is fixed to one end of the bottom of the U-shaped frame (8), a rotating shaft (28) is rotatably connected to the ear plate (27), the water cutting fixture (13) is fixed to one end of the rotating shaft (28), and a discharge device (29) for driving the rotating shaft (28) to rotate is installed at the bottom of the cross bar (20).

4. A plastic part nozzle cutting device according to claim 3, characterized in that: The unloading device (29) comprises a rack (30) fixed to the bottom of the crossbar (20), and a gear (31) meshing with the rack (30) is fixed on the rotating shaft (28).

5. The device for cutting a nozzle for a plastic part according to claim 1, characterized in that: The water cut fixture (13) is provided with a waste discharge channel (32) for waste material from the water outlet.

6. A plastic part nozzle cutting device according to claim 1, characterized in that: The pressing assembly (11) includes a pressing cylinder (33), the top of which is fixedly connected to the second-stage piston rod (15), the bottom of which is open, and the bottom edge of which is engaged with the plastic part.

7. A plastic part nozzle cutting device according to claim 6, characterized in that: The water cutter assembly (12) comprises an L-shaped cutting knife (34) fixed to the end of the first-stage piston rod (16).

8. A plastic part nozzle cutting device according to claim 7, characterized in that: The side wall of the pressing cylinder (33) is provided with an escape notch (35) for escaping the L-shaped cutting knife (34).

9. The device for cutting a nozzle for a plastic part according to claim 4, characterized in that: A sliding groove (36) is provided inside the rack (30), a fixing rod (37) is fixed on the U-shaped frame (8), and the fixing rod (37) is slidably connected in the sliding groove (36).

10. A plastic part nozzle cutting device according to claim 4, characterized in that: The water cut fixture (13) is stepped, and the circumference of the side wall of one end of the water cut fixture (13) that cooperates with the plastic part is smaller than the circumference of the side wall of the other end. An anti-rotation rod (38) is fixed to the side wall of the rotating shaft (28), and an anti-rotation plane (39) is provided at the end of the anti-rotation rod (38). A blocking plate (40) that cooperates with the anti-rotation plane (39) is fixed on the rack (30).

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