Adjustable automatic circular ring flanging machine

By designing an adjustable automatic ring bending machine, multiple bending is achieved, solving the problems of low production efficiency and difficulty in cost control caused by the existing technology that can only be bent once, thus improving production efficiency and reducing operational complexity.

CN223847863UActive Publication Date: 2026-01-30NANTONG TUOHUA IND AUTOMATION TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202520390974.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-07
Publication Date
2026-01-30
Estimated Expiration
2035-03-07

AI Technical Summary

Technical Problem

Existing automatic ring bending machines can only perform one bend, resulting in low production efficiency, long cycle time, difficulty in cost control, high operational complexity, and high possibility of error for products requiring multiple bends.

Method used

An adjustable automatic ring bending machine was designed. The bending block is driven by a sliding limit rod and an adjusting mounting base to achieve multiple bending, and the bending block is precisely shaped by a limit mold and a chuck.

Benefits of technology

It improves the production efficiency of rings, reduces production cycle and cost, reduces operational complexity and error risk, and ensures efficient production of products that require multiple bending operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of edge folding machines, and discloses an adjustable automatic ring edge folding machine which comprises an edge folding machine bottom box and further comprises a machining platform and a limiting assembly, the right side of the edge folding machine bottom box is fixedly connected with a distribution box, and the top of the edge folding machine bottom box is fixedly connected with an edge folding machine main box body. A machining base table is fixedly connected into the flanging machine bottom box, and a protective net is arranged on the front face of the flanging machine main box body. The adjusting support is driven to slide in the limiting guide disc through sliding of the adjusting mounting base, and the fixed limiting block is driven to slide outside the limiting sliding block when the adjusting mounting base slides. The edge folding block is driven to be pushed outwards through sliding of the adjusting support to extrude the circular ring body, secondary edge folding molding of the circular ring body is achieved under limiting of the limiting mold, the circular ring production efficiency is improved, the circular ring production period is shortened, the overall production efficiency and cost control are guaranteed, and the production cost is reduced. And the problems of operation complexity and error possibility are reduced.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the edge folder technical field especially adjustable circular ring automatic edge folder. BACKGROUND

[0002] Circular ring automatic edge folder is a kind of equipment specially used for the edge folding processing of cylindrical object, realizes efficient, accurate edge folding processing by automation technology, and circular ring automatic edge folder adopts advanced numerical control system, can accurately control the angle and depth of edge folding, ensures that each product reaches the specified specification requirement, selects appropriate circular ring automatic edge folder, can effectively improve production efficiency, reduces production cost, and creates more value for enterprise.

[0003] In the prior art, since the device is mainly driven by motor to press the workpiece by the upper clamping sliding block when using circular ring automatic edge folder, and the rotary action of the edge folding sliding block is matched, the plate is bent and formed. Specifically, the edge folding sliding block can be rotated by 90 degrees to 176 degrees under the driving of the motor, so as to drive the plate to bend. In the traditional bending process, only one-time bending can be carried out on the circular ring to be bent. Since only one-time bending can be carried out, for products that need to be bent multiple times to be completed, the production efficiency will be seriously affected. This not only increases the production cycle, but also may affect the overall production efficiency and cost control. The operator may need more operation steps to complete the complex bending task, which undoubtedly increases the complexity of operation and the possibility of error. Therefore, adjustable circular ring automatic edge folder is needed to solve the above problems. SUMMARY

[0004] In order to overcome the problem that the adjustable circular ring automatic edge folder can only be bent once in the traditional bending process, and since only one-time bending can be carried out, for products that need to be bent multiple times to be completed, the production efficiency will be seriously affected. This not only increases the production cycle, but also may affect the overall production efficiency and cost control. The operator may need more operation steps to complete the complex bending task, which undoubtedly increases the complexity of operation and the possibility of error.

[0005] The utility model discloses a technical scheme for an adjustable circular ring automatic flanging machine, which comprises a flanging machine bottom box, a processing platform and a limiting component, a distribution box is fixedly connected to the right side of the flanging machine bottom box, a flanging machine main box body is fixedly connected to the top of the flanging machine bottom box, a processing base is fixedly connected to the inside of the flanging machine bottom box, a protective net is arranged on the front face of the flanging machine main box body, a control panel is arranged on the left side of the flanging machine main box body, the limiting component is arranged in the inside of the flanging machine main box body, a processing platform is rotatably connected to the inside of the processing base, a guide turntable is rotatably connected to the bottom of the processing platform, a sliding limiting rod is slidably connected to the inside of the guide turntable, an adjusting mounting seat is fixedly connected to the top of the sliding limiting rod, a limiting slide block is fixedly connected to the top of the adjusting mounting seat, a limiting guide disc is arranged in the inside of the processing platform, a fixed limiting block is fixedly connected to the inside of the limiting guide disc, the fixed limiting block is slidably connected to the outside of the limiting slide block, an adjusting support is fixedly connected to the top of the adjusting mounting seat, the adjusting support is slidably connected to the inside of the limiting guide disc, a flanging block is fixedly connected to the outside of the adjusting support, a flanging disc is fixedly connected to the top of the limiting guide disc, and a circular ring body and a limiting die are arranged in the inside of the processing platform.

[0006] Preferably, the sliding limiting rod is provided with a plurality of sliding limiting rods, and the plurality of sliding limiting rods are uniformly slidably connected to the inside of the guide turntable.

[0007] Preferably, the fixed limiting block is provided with a sliding groove at a corresponding position in the inside of the limiting slide block, and the fixed limiting block is slidably connected to the outside of the limiting slide block through the sliding groove.

[0008] Preferably, the bottom of the processing base is fixedly connected with a first supporting rod, the bottom of the first supporting rod is fixedly connected with a first supporting plate, the outside of the first supporting rod is slidably connected with a first connecting seat, the bottom of the first supporting plate is provided with a first air pump telescopic rod, the bottom of the first connecting seat is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a rotating gear shaft, the inside of the first connecting seat is rotatably connected with a rotating gear, the outside of the rotating gear is fixedly connected with a rotating supporting column, and the rotating supporting column is meshingly connected to the outside of the rotating gear shaft.

[0009] Preferably, the first connecting seat is provided with a sliding groove at a corresponding position of the first supporting rod, and the first connecting seat is slidably connected to the outside of the first supporting rod through the sliding groove.

[0010] As preferred, the limiting assembly comprises a second supporting rod, the top of the second supporting rod is fixedly connected with a second supporting plate, the outside of the second supporting rod is slidably connected with a second connecting seat, the inside of the main box body of the flanging machine is fixedly connected with a second motor, the top of the second connecting seat is fixedly connected with the second motor, the output end of the second motor is fixedly connected with a first rotating pulley, the inside of the second connecting seat is rotatably connected with a second rotating pulley, the outside of the second rotating pulley is drivingly connected with a transmission belt, the transmission belt is drivingly connected with the outside of the first rotating pulley, the right side of the second rotating pulley is fixedly connected with a bidirectional screw rod, the inside of the second connecting seat is rotatably connected with the bidirectional screw rod, the outside of the bidirectional screw rod is threadedly connected with a sliding connecting seat, the bottom of the second connecting seat is fixedly connected with a limiting sliding groove plate, the bottom of the sliding connecting seat is fixedly connected with an adjusting supporting plate, the adjusting supporting plate is slidably connected with the outside of the limiting sliding groove plate, and the inside of the limiting sliding groove plate is provided with a limiting chuck.

[0011] As preferred, the sliding connecting seat is provided with two, and the two sliding connecting seats are symmetrically threadedly connected with the outside of the bidirectional screw rod.

[0012] The utility model discloses the beneficial effects that relative to the adjustable circular ring automatic flanging machine of unable multiple bending, through the sliding of adjusting mounting seat drive adjusting support in the inside sliding of limiting guide disc, drive fixed limiting block in the outside sliding of limiting sliding block when adjusting mounting seat sliding, drive flanging block outward push and extrude circular ring body through the limiting of limiting mould and realize the plasticity of circular ring body secondary flanging, improve the efficiency of circular ring production, reduce the production cycle of circular ring, guarantee the overall production efficiency and cost control, reduce the complexity of operation and the possibility of error problem, thereby effectively prevent due to only once bending, for the product that needs multiple bending to complete leads to the production efficiency to be seriously affected. ACCURACY OF DRAWINGS

[0013] Figure 1 It is appearance structure schematic diagram of the utility model;

[0014] Figure 2 It is flanging machine bottom box inside structure schematic diagram of the utility model;

[0015] Figure 3 It is processing platform bottom structure schematic diagram of the utility model;

[0016] Figure 4 It is processing platform bottom inside structure schematic diagram of the utility model;

[0017] Figure 5 It is flanging machine main box body inside structure schematic diagram of the utility model;

[0018] Figure 6The second connecting seat internal structure schematic view of the utility model.

[0019] Mark explanation: 1, the edge folding machine bottom box; 2, distribution box; 3, edge folding machine main box; 4, protective net; 5, processing base; 6, control panel; 801, first support rod; 802, first support plate; 803, first connecting seat; 804, first air pump telescopic rod; 805, first motor; 806, rotating gear shaft; 807, rotating support column; 808, rotating gear; 809, processing platform; 810, guide turntable; 811, sliding limit rod; 812, adjusting mounting seat; 813, limit sliding block; 814, limit guide disc; 815, fixed limit block; 816, adjusting support; 817, edge folding block; 818, edge folding disc; 819, circular ring body; 820, limit mould; 901, second support rod; 902, second support plate; 903, second connecting seat; 904, second motor; 905, first rotating pulley; 906, second rotating pulley; 907, transmission belt; 908, bidirectional screw; 909, sliding connecting seat; 910, limit sliding groove plate; 911, adjusting support plate; 912, limit chuck. DETAILED DESCRIPTION

[0020] The utility model is further explained below in connection with the drawings and examples.

[0021] Please refer to Figure 1 - Figure 6The utility model provides a kind of embodiment: adjustable annular automatic flanging machine, including flanging machine bottom box 1, still including processing platform 809 with limiting component, the right side of flanging machine bottom box 1 is fixedly connected with distribution box 2, the top of flanging machine bottom box 1 is fixedly connected with flanging machine main box 3, the inside of flanging machine bottom box 1 is fixedly connected with processing base 5, the front of flanging machine main box 3 is provided with protective net 4, the left side of flanging machine main box 3 is provided with control panel 6, limiting component is arranged in the inside of flanging machine main box 3, the inside of processing base 5 is rotatably connected with processing platform 809, the bottom of processing platform 809 is rotatably connected with guide turntable 810, the inside of guide turntable 810 is slidably connected with sliding limiting rod 811, the top of sliding limiting rod 811 is fixedly connected with adjusting mounting seat 812, the top of adjusting mounting seat 812 is fixedly connected with limiting slide 813, the inside of processing platform 809 is provided with limiting guide disc 814, the inside of limiting guide disc 814 is fixedly connected with fixed limiting block 815, fixed limiting block 815 is slidably connected at the outside of limiting slide 813, the top of adjusting mounting seat 812 is fixedly connected with adjusting support 816, adjusting support 816 is slidably connected in the inside of limiting guide disc 814, the outside of adjusting support 816 is fixedly connected with flanging block 817, the top of limiting guide disc 814 is fixedly connected with flanging disc 818, the inside of processing platform 809 is provided with annular body 819 with limiting mould 820, power supply is carried out to device by the distribution box 2 of setting, the processing of protective effect is played to by the protective net 4 of setting, the operation of device is controlled by the control panel 6 of setting, the inside sliding groove of guide turntable 810 is slid by the rotation of guide turntable 810 and drive sliding limiting rod 811, adjusting mounting seat 812 is slid by the sliding of sliding limiting rod 811, adjusting support 816 is slid in the inside of limiting guide disc 814 by the sliding of adjusting mounting seat 812, fixed limiting block 815 is slid at the outside of limiting slide 813 by the sliding of adjusting mounting seat 812, flanging block 817 is extruded to annular body 819 by the sliding of adjusting support 816 and is limited to realize the plasticity of annular body 819 flanging by limiting mould 820, sliding limiting rod 811 is provided with several, and several sliding limiting rods 811 are evenly slidably connected in the inside of guide turntable 810, the stress of flanging block 817 is more uniform when being pushed to annular body 819 by several sliding limiting rods 811 of setting, the corresponding position of fixed limiting block 815 is provided with sliding groove in the inside of limiting slide 813, fixed limiting block 815 is slid at the outside of limiting slide 813 by sliding groove, the sliding of limiting slide 813 is limited when being slid in the inside of sliding groove by the sliding groove of the corresponding limiting slide 813 position of fixed limiting block 815 inside.

[0022] Please refer to Figure 2 - Figure 4In the embodiment, the bottom of the machining base 5 is fixedly connected with a first supporting rod 801, the bottom of the first supporting rod 801 is fixedly connected with a first supporting plate 802, the outside of the first supporting rod 801 is slidingly connected with a first connecting seat 803, the bottom of the first supporting plate 802 is provided with a first air pump telescopic rod 804, the bottom of the first connecting seat 803 is fixedly connected with a first motor 805, the output end of the first motor 805 is fixedly connected with a rotating gear shaft 806, the inside of the first connecting seat 803 is rotatably connected with a rotating gear 808, the outside of the rotating gear 808 is fixedly connected with a rotating supporting column 807, the rotating supporting column 807 is meshedly connected to the outside of the rotating gear shaft 806, the first connecting seat 803 is slidingly arranged in the inside of the folding machine bottom box 1 under the limiting of the first supporting rod 801 by the first air pump telescopic rod 804, the machining platform 809 is pushed to lift up, the rotating gear shaft 806 and the rotating supporting column 807 are meshed and rotated by the first motor 805, the rotating supporting column 807 is rotated by the meshing of the rotating gear 808 and the rotating gear shaft 806, the guide turntable 810 is rotated by the rotation of the rotating supporting column 807, the first connecting seat 803 is provided with a sliding groove at the corresponding position of the first supporting rod 801, the first connecting seat 803 is slidingly arranged outside the first supporting rod 801 through the sliding groove, and the first supporting rod 801 is limited when sliding in the sliding groove through the sliding groove arranged in the first connecting seat 803 corresponding to the position of the first supporting rod 801.

[0023] Please refer to Figure 5 - Figure 6In the embodiment, the limiting assembly comprises a second supporting rod 901, the top of the second supporting rod 901 is fixedly connected with a second supporting plate 902, the outside of the second supporting rod 901 is slidingly connected with a second connecting seat 903, the inside of the main box body 3 of the flanging machine is fixedly connected with a second motor 904, the top of the second connecting seat 903 is fixedly connected with the second motor 904, the output end of the second motor 904 is fixedly connected with a first rotating pulley 905, the inside of the second connecting seat 903 is rotatably connected with a second rotating pulley 906, the outside of the second rotating pulley 906 is drivingly connected with a transmission belt 907, the outside of the first rotating pulley 905 is drivingly connected with the transmission belt 907, the right side of the second rotating pulley 906 is fixedly connected with a bidirectional screw rod 908, the inside of the second connecting seat 903 is rotatably connected with the bidirectional screw rod 908, the outside of the bidirectional screw rod 908 is threadedly connected with a sliding connecting seat 909, the bottom of the second connecting seat 903 is fixedly connected with a limiting sliding groove plate 910, the bottom of the sliding connecting seat 909 is fixedly connected with an adjusting supporting plate 911, the outside of the limiting sliding groove plate 910 is slidingly connected with the adjusting supporting plate 911, the inside of the limiting sliding groove plate 910 is provided with a limiting chuck 912, the second connecting seat 903 is slidingly arranged in the inside of the main box body 3 of the flanging machine under the limitation of the second supporting rod 901 by the second motor 904, the first rotating pulley 905 is driven to rotate by the second motor 904, the second rotating pulley 906 is driven to rotate under the rotation of the transmission belt 907 by the rotation of the first rotating pulley 905, the bidirectional screw rod 908 is driven to rotate in the inside of the second connecting seat 903 by the rotation of the second rotating pulley 906, the adjusting supporting plate 911 is driven to move under the engagement connection between the bidirectional screw rod 908 and the sliding connecting seat 909 by the rotation of the bidirectional screw rod 908, the adjusting supporting plate 911 is limited by the limiting sliding groove plate 910 arranged in the sliding state, the limiting chuck 912 is driven to move by the sliding of the adjusting supporting plate 911, the limiting die 820 is fixedly limited by the limiting chuck 912, the sliding connecting seat 909 is provided with two, and the two sliding connecting seats 909 are symmetrically threadedly connected to the outside of the bidirectional screw rod 908, the two sliding connecting seats 909 are arranged to enable the limiting chuck 912 to symmetrically slide in the inside of the second connecting seat 903.

[0024] In the working process, the circular ring body 819 is placed on the top of the folding disc 818, and the limiting mold 820 is placed on the top of the circular ring body 819. When the circular ring body 819 and the limiting mold 820 are fixed and limited, the second connecting seat 903 is pushed to slide in the inside of the folding machine main box 3 under the limitation of the second supporting rod 901 by the second motor 904. The first rotating pulley 905 is driven to rotate by the second motor 904, and the second rotating pulley 906 is driven to rotate under the rotation of the transmission belt 907 by the rotation of the first rotating pulley 905. The bidirectional screw rod 908 is driven to rotate in the inside of the second connecting seat 903 by the rotation of the second rotating pulley 906, and the adjusting supporting plate 911 is driven to move under the engagement connection of the bidirectional screw rod 908 and the sliding connecting seat 909. The adjusting supporting plate 911 is limited by the limiting sliding groove plate 910 under the sliding, and the limiting chuck 912 is driven to move by the sliding of the adjusting supporting plate 911. The limiting mold 820 is fixed and limited by the limiting chuck 912. In the working process, the first connecting seat 803 is pushed to slide in the inside of the folding machine bottom box 1 under the limitation of the first supporting rod 801 by the first air pump telescopic rod 804, the processing platform 809 is lifted upward, the folding disc 818 is contacted with the circular ring body 819, the circular ring body 819 is pushed to be folded for the first time, the rotating gear shaft 806 and the rotating supporting column 807 are engaged to rotate by the first motor 805, the rotating supporting column 807 is driven to rotate by the engagement of the rotating gear 808 and the rotating gear shaft 806, the guide turntable 810 is driven to rotate by the rotation of the rotating supporting column 807, the sliding limiting rod 811 is driven to slide in the inside sliding groove of the guide turntable 810 by the rotation of the guide turntable 810, the adjusting mounting seat 812 is driven to slide by the sliding of the sliding limiting rod 811, the adjusting bracket 816 is driven to slide in the inside of the limiting guide disc 814 by the sliding of the adjusting mounting seat 812, the fixed limiting block 815 is driven to slide outside the limiting sliding block 813 by the sliding of the adjusting mounting seat 812, the folding block 817 is pushed outward to extrude the circular ring body 819 by the sliding of the adjusting bracket 816, and the circular ring body 819 is folded for the second time by the limitation of the limiting mold 820.

[0025] Through the above steps, the sliding limiting rod 811 is driven to slide in the internal sliding groove of the guide turntable 810 through the rotation of the guide turntable 810, the adjusting mounting seat 812 is driven to slide through the sliding of the sliding limiting rod 811, the adjusting bracket 816 is driven to slide in the internal sliding groove of the limiting guide disc 814 through the sliding of the adjusting mounting seat 812, the fixed limiting block 815 is driven to slide outside the limiting sliding block 813 when the adjusting mounting seat 812 slides, and the folding edge block 817 is driven to extrude the circular ring body 819 outward through the sliding of the adjusting bracket 816, so that the circular ring body 819 is molded through the secondary folding edge of the limiting mold 820, so as to solve the problem that the adjustable circular ring automatic folding machine can only perform one-time folding on the circular ring needing to be folded in the traditional folding process. Since only one-time folding can be performed, the production efficiency of the product needing to be folded multiple times to be completed will be seriously affected. This not only increases the production cycle, but also may affect the overall production efficiency and cost control. The operator may need more operation steps to complete the complex folding task, which undoubtedly increases the operation complexity and the possibility of errors.

Claims

1. An adjustable circular automatic flanging machine comprising a flanging machine base box (1), characterized in that: The utility model also includes processing platform (809) and limiting component, the right side fixed connection of edge folding machine bottom box (1) has distribution box (2), the top fixed connection of edge folding machine bottom box (1) has edge folding machine main box (3), the inside fixed connection of edge folding machine bottom box (1) has processing base (5), the front of edge folding machine main box (3) is provided with protective net (4), the left side of edge folding machine main box (3) is provided with control panel (6), limiting component sets up in the inside of edge folding machine main box (3), the inside rotationally connected of processing base (5) has processing platform (809), the bottom rotationally connected of processing platform (809) has guide carousel (810), the inside sliding connection of guide carousel (810) has sliding limiting rod (811), the top fixed connection of sliding limiting rod (811) has adjustment mounting seat (812), the top fixed connection of adjustment mounting seat (812) has limiting slide block (813), the inside of processing platform (809) is provided with limiting guide disc (814), the inside fixed connection of limiting guide disc (814) has fixed limiting block (815), fixed limiting block (815) slidingly connected in the outside of limiting slide block (813), the top fixed connection of adjustment mounting seat (812) has adjustment support (816), adjustment support (816) slidingly connected in the inside of limiting guide disc (814), the outside fixed connection of adjustment support (816) has edge folding block (817), the top fixed connection of limiting guide disc (814) has edge folding disc (818), the inside of processing platform (809) is provided with circular ring body (819) with limiting mould (820).

2. The adjustable circular ring auto-seaming machine of claim 1, wherein: The sliding limiting rod (811) is provided with a plurality of sliding limiting rods (811) which are uniformly slidingly connected in the inside of the guide carousel (810).

3. The adjustable circular ring auto-curler of claim 1, wherein: The fixed limiting block (815) is provided with a sliding groove in the corresponding position in the inside of the limiting slide block (813), and the fixed limiting block (815) slides outside the limiting slide block (813) through the sliding groove.

4. The adjustable circular ring auto-curler of claim 1, wherein: The bottom of the processing base (5) is fixedly connected with a first supporting rod (801), the bottom of the first supporting rod (801) is fixedly connected with a first supporting plate (802), the outside of the first supporting rod (801) is slidingly connected with a first connecting seat (803), the bottom of the first supporting plate (802) is provided with a first air pump telescopic rod (804), the bottom of the first connecting seat (803) is fixedly connected with a first motor (805), the output end of the first motor (805) is fixedly connected with a rotating gear shaft (806), the inside of the first connecting seat (803) is rotationally connected with a rotating gear (808), the outside of the rotating gear (808) is fixedly connected with a rotating supporting column (807), and the rotating supporting column (807) is meshedly connected outside the rotating gear shaft (806).

5. The adjustable circular ring auto-curler of claim 4, wherein: The first connecting seat (803) is provided with a sliding groove in the corresponding position of the first supporting rod (801), and the first connecting seat (803) slides outside the first supporting rod (801) through the sliding groove.

6. The adjustable circular ring auto-curler of claim 1, wherein: The limiting assembly comprises a second supporting rod (901), the top of the second supporting rod (901) is fixedly connected with a second supporting plate (902), the outside of the second supporting rod (901) is slidingly connected with a second connecting seat (903), the inside of a folding machine main box body (3) is fixedly connected with a second motor (904), the top of the second connecting seat (903) is fixedly connected with the second motor (904), the top of the second connecting seat (903) is fixedly connected with the second motor (904), the output end of the second motor (904) is fixedly connected with a first rotating belt pulley (905), the inside of the second connecting seat (903) is rotatably connected with a second rotating belt pulley (906), the outside of the second rotating belt pulley (906) is drivingly connected with a transmission belt (907), the outside of the first rotating belt pulley (905) is drivingly connected with the transmission belt (907), the right side of the second rotating belt pulley (906) is fixedly connected with a bidirectional screw rod (908), the inside of the second connecting seat (903) is rotatably connected with the bidirectional screw rod (908), the outside of the bidirectional screw rod (908) is screwedly connected with a sliding connecting seat (909), the bottom of the second connecting seat (903) is fixedly connected with a limiting sliding groove plate (910), the bottom of the sliding connecting seat (909) is fixedly connected with an adjusting supporting plate (911), the outside of the limiting sliding groove plate (910) is slidingly connected with the adjusting supporting plate (911), and the inside of the limiting sliding groove plate (910) is provided with a limiting chuck (912).

7. The adjustable circular ring auto-curler of claim 6, wherein: The sliding connecting seat (909) is provided with two, and the two sliding connecting seats (909) are screwedly connected outside the bidirectional screw rod (908) in a symmetrical mode.