Aluminum alloy pipe bar backward extrusion hydraulic machine

Abstract

The utility model relates to the technical field of hydraulic machines, in particular to an aluminum alloy pipe bar backward extrusion hydraulic machine which comprises a workbench, an installation block is fixedly connected to the upper surface of the workbench, a motor is fixedly connected to the side wall of the installation block, and the output end of the motor is fixedly connected with a rotating shaft. The output end of the rotating shaft is fixedly connected with a first rotating disc, a rotating groove is formed in the first rotating disc, a second rotating disc is movably installed on the inner wall of the rotating groove, an inclined groove is formed in the side wall of the second rotating disc, a moving groove is formed in the inner wall of the rotating groove, and a spring groove is formed in the inner wall of the moving groove. A limiting pin is arranged in the spring groove, and the side wall of the limiting pin is fixedly connected with a movable pin. According to the utility model, four common outer molds can be mounted on the first turntable, so that the switching is more convenient, meanwhile, the outer molds and the first turntable also realize the effect of quick disassembly and assembly, and more time for replacing the outer molds is saved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic presses, and in particular to a hydraulic press for reverse extrusion of aluminum alloy tubes and bars. Background Technology

[0002] Aluminum alloy tubes and bars are widely used in aerospace, automotive manufacturing, and other fields. Traditional extrusion processes suffer from quality defects during tube and bar production. The aluminum alloy tube and bar reverse extrusion hydraulic press was developed to address this issue, improving product quality, reducing costs, and meeting the growing demand from various industries for high-precision, high-performance aluminum alloy tubes and bars.

[0003] The outer diameter of aluminum tubes formed by existing aluminum alloy tube and bar reverse extrusion hydraulic presses is usually fixed. To change the outer diameter of the formed aluminum tube, it is necessary to replace the corresponding outer mold. The outer mold is usually fixed to the corresponding base with bolts, which is very inconvenient and time-consuming to replace. Utility Model Content

[0004] In view of this, the present invention provides an aluminum alloy tube and bar reverse extrusion hydraulic press. The main technical problem to be solved is that the outer diameter of the formed aluminum tube is usually fixed. If the outer diameter of the formed aluminum tube is to be changed, the corresponding outer mold needs to be replaced. The outer mold is usually fixed to the corresponding base with bolts, which is very inconvenient and time-consuming to replace.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an aluminum alloy tube and rod reverse extrusion hydraulic press, comprising a worktable, an mounting block fixedly connected to the upper surface of the worktable, a motor fixedly connected to the side wall of the mounting block, a rotating shaft fixedly connected to the output end of the motor, a first turntable fixedly connected to the output end of the rotating shaft, four rotating grooves being formed inside the first turntable, a second turntable movably mounted on the inner wall of the rotating groove, multiple inclined grooves being formed on the side wall of the second turntable, multiple moving grooves being formed on the inner wall of the rotating groove, a spring groove being formed on the inner wall of the moving groove, a limiting pin being provided inside the spring groove, a moving pin being fixedly connected to the side wall of the limiting pin, a sliding pin being fixedly connected to the end of the moving pin away from the limiting pin, the moving pin being located inside the moving groove, the sliding pin being located inside the inclined groove, an installation groove being formed on the inner wall of the spring groove, an outer mold being provided inside the installation groove, a limiting groove being formed on the outer surface of the outer mold, and a limiting pin being located inside the limiting groove.

[0006] By adopting the above technical solution, four commonly used outer molds can be installed on the first turntable, making switching more convenient. At the same time, the outer molds and the first turntable can be quickly disassembled and assembled, saving more time in changing the outer molds.

[0007] As a further description of the above technical solution:

[0008] A spring is fixedly connected to the inner wall of the spring groove, and one end of the spring is fixedly connected to the side wall of the limiting pin. A toggle groove is provided on the inner surface of the rotating groove, and a toggle block is fixedly connected to the outer surface of the second turntable. The toggle block is located inside the toggle groove.

[0009] By adopting the above technical solution, the spring can be used to reset the limit pin, and the toggle block can drive the second turntable to rotate.

[0010] As a further description of the above technical solution:

[0011] The mounting block has a load-bearing plate fixedly connected to its side wall. The upper surface of the load-bearing plate has an arc-shaped groove that fits into the outer surface of the first turntable. The inner surface of the mounting block has a discharge pipe fixedly connected to it.

[0012] By adopting the above technical solution, the load-bearing plate can limit and support the first turntable, and the tube bar after reverse extrusion molding extends out from the discharge pipe.

[0013] As a further description of the above technical solution:

[0014] A first support plate is fixedly connected to the upper surface of the workbench, a first hydraulic cylinder is fixedly connected to the upper surface of the first support plate, a moving rod is fixedly connected to the right side of the first hydraulic cylinder, and a protective shell is fixedly connected to the end of the moving rod away from the first hydraulic cylinder.

[0015] By adopting the above technical solution, the first support plate is used to support the first hydraulic cylinder, and the operation of the first hydraulic cylinder can drive the moving rod to move left and right.

[0016] As a further description of the above technical solution:

[0017] A second hydraulic cylinder is fixedly connected to the inner surface of the protective shell, and a perforating needle is fixedly connected to the right side of the second hydraulic cylinder. A compression pad is sleeved on the outer surface of the perforating needle, and the compression pad is fixedly connected to the right side of the second hydraulic cylinder.

[0018] By adopting the above technical solution, the piercing needle is used to punch a hole in the middle of the aluminum rod to be processed. The front end of the piercing needle is equipped with the core of the inner mold, which can determine the inner diameter of the formed aluminum tube. The extrusion pad is used to buffer between the second hydraulic cylinder and the aluminum rod to be processed, so as to avoid direct contact between the second hydraulic cylinder and the aluminum rod to be processed.

[0019] As a further description of the above technical solution:

[0020] A connecting plate is fixedly connected to the right side of the protective shell, and a placement tube is fixedly connected to the side wall of the connecting plate.

[0021] By adopting the above technical solution, the placement tube is used to place the aluminum rod to be processed, and the aluminum rod to be processed is placed inside the placement tube, on the right side of the extrusion pad.

[0022] As a further description of the above technical solution:

[0023] A connecting block is fixedly connected to the side wall of the first support plate, and a second support plate is fixedly connected to the side of the connecting block away from the first support plate. A limiting plate is fixedly connected to the inner surface of the second support plate, and there are two limiting plates. A first sliding groove is opened on the side wall of the protective shell, and the limiting plate is located inside the first sliding groove. A second sliding groove is opened on the side wall of the connecting plate, and the limiting plate is located inside the second sliding groove.

[0024] By adopting the above technical solution, the connecting block is used to connect the first support plate and the second support plate together, and the limiting plate can limit and support the protective shell and the connecting plate, so that the protective shell, the connecting plate and the placement tube can move along with the moving rod.

[0025] As a further description of the above technical solution:

[0026] The lower surface of the workbench is fixedly connected with four legs.

[0027] By adopting the above technical solution, the support legs can provide support for the workbench.

[0028] By employing the above technical solution, the aluminum alloy tube and bar reverse extrusion hydraulic press of this utility model has at least the following beneficial effects:

[0029] Compared with existing technologies, this aluminum alloy tube and bar reverse extrusion hydraulic press comprises a motor, a rotating shaft, a first turntable, a discharge pipe, an outer mold, a lever, a second turntable, a sloping groove, sliding pins, moving pins, limit pins, springs, and a limit groove. When it is necessary to change the outer diameter of the processed seamless aluminum tube, simply control the motor to drive the rotating shaft and the first turntable to rotate, changing the position of the outer mold aligned with the discharge pipe. When it is necessary to replace with different models of outer molds, simply move the lever to drive the second turntable to rotate. Due to the presence of the sloping groove, adjacent sliding pins can be moved away from each other, which in turn moves adjacent moving pins and limit pins away from each other. The springs contract, allowing the limit pins to disengage from the limit grooves, thus enabling the outer mold to be removed and replaced with other models. When installation is required, the lever is moved to drive the second turntable and move the adjacent limit pins away. When the outer mold is placed in the predetermined position, the lever is released, the spring rebounds and moves the adjacent limit pins closer to each other. Finally, the limit pins enter the interior of the limit groove to limit the outer mold. Compared with the existing reverse extrusion hydraulic press, the outer diameter of the formed aluminum tube is usually fixed. If you want to change the outer diameter of the formed aluminum tube, you need to replace the corresponding outer mold. The outer mold is usually fixed to the corresponding base with bolts, which is very inconvenient and time-consuming to replace. This aluminum alloy tube and bar reverse extrusion hydraulic press can install four commonly used outer molds on the first turntable, which is more convenient to switch. At the same time, the outer mold and the first turntable can also achieve quick disassembly and assembly, which saves more time to replace the outer mold. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an aluminum alloy tube and bar reverse extrusion hydraulic press proposed in this utility model;

[0031] Figure 2 This is a cross-sectional view of the overall structure of an aluminum alloy tube and bar reverse extrusion hydraulic press proposed in this utility model;

[0032] Figure 3 This utility model proposes a hydraulic press for reverse extrusion of aluminum alloy tubes and bars. Figure 2 Enlarged view of the structure at point A in the middle;

[0033] Figure 4 This utility model proposes a hydraulic press for reverse extrusion of aluminum alloy tubes and bars. Figure 2 Enlarged view of the structure at point B;

[0034] Figure 5 This is a cross-sectional view of the first rotary table section of an aluminum alloy tube and bar reverse extrusion hydraulic press proposed in this utility model;

[0035] Figure 6 This utility model proposes a hydraulic press for reverse extrusion of aluminum alloy tubes and bars. Figure 5 Enlarged view of the structure at point C;

[0036] Figure 7 This is a structural diagram of the second rotary table of an aluminum alloy tube and bar reverse extrusion hydraulic press proposed in this utility model;

[0037] Figure 8 This utility model provides a structural diagram of a limiting pin for an aluminum alloy tube and bar reverse extrusion hydraulic press.

[0038] Figure 9 This utility model provides a structural diagram of the outer mold of an aluminum alloy tube and bar reverse extrusion hydraulic press.

[0039] Figure 10 This is a structural diagram of the first hydraulic cylinder of an aluminum alloy tube and bar reverse extrusion hydraulic press proposed in this utility model;

[0040] Figure 11 This is a structural diagram of the first support plate of an aluminum alloy tube and bar reverse extrusion hydraulic press proposed in this utility model.

[0041] Legend:

[0042] 1. Workbench; 2. Mounting block; 3. Motor; 4. Rotating shaft; 5. First turntable; 6. Rotating groove; 7. Second turntable; 8. Moving groove; 9. Spring groove; 10. Spring; 11. Limiting pin; 12. Moving pin; 13. Sliding pin; 14. Inclined groove; 15. Outer mold; 16. Limiting groove; 17. Mounting groove; 18. Load-bearing plate; 19. First support plate; 20. First hydraulic cylinder; 21. Moving rod; 22. Protective shell; 23. Second hydraulic cylinder; 24. Extrusion pad; 25. Piercing needle; 26. Connecting plate; 27. Placement tube; 28. Connecting block; 29. ​​Second support plate; 30. Limiting plate; 31. First sliding groove; 32. Second sliding groove; 33. Pulley; 34. Pulley groove; 35. Discharge tube; 36. Support leg. Detailed Implementation

[0043] Reference Figure 1-11This utility model provides an aluminum alloy tube and rod reverse extrusion hydraulic press, comprising a worktable 1, an mounting block 2 fixedly connected to the upper surface of the worktable 1, a motor 3 fixedly connected to the side wall of the mounting block 2, the motor 3 rotating only 90 degrees at a time to ensure that each rotation corresponds exactly to an outer mold 15 and a discharge pipe 35, a rotating shaft 4 fixedly connected to the output end of the motor 3, a first turntable 5 fixedly connected to the output end of the rotating shaft 4, four rotating grooves 6 being formed inside the first turntable 5, a second turntable 7 movably mounted on the inner wall of the rotating grooves 6, multiple inclined grooves 14 being formed on the side wall of the second turntable 7, and multiple movable grooves 8 being formed on the inner wall of the rotating grooves 6. The system includes a spring groove 9, inside which a limit pin 11 is installed. A movable pin 12 is fixedly connected to the side wall of the limit pin 11, and a sliding pin 13 is fixedly connected to the end of the movable pin 12 away from the limit pin 11. The movable pin 12 is located inside the movable groove 8, and the sliding pin 13 is located inside the inclined groove 14. An installation groove 17 is formed on the inner wall of the spring groove 9, and an outer mold 15 is set inside the installation groove 17. Each outer mold 15 has a different inner diameter, which determines the outer diameter of the formed seamless aluminum tube. A limit groove 16 is formed on the outer surface of the outer mold 15, and the limit pin 11 is located inside the limit groove 16. When it is necessary to change the outer diameter of the processed seamless aluminum tube, it is only necessary to control the motor 3 to drive the rotating shaft 4 and the first turntable 5 to rotate, thus changing the outer diameter. The material tube 35 is aligned with the position of the outer mold 15. When it is necessary to replace the outer mold 15 with a different model, simply move the lever 33 to rotate the second turntable 7. Due to the presence of the inclined groove 14, the adjacent sliding pins 13 can be moved away from each other, which in turn moves the adjacent moving pins 12 and the limiting pins 11 away from each other. The spring 10 contracts, allowing the limiting pins 11 to disengage from the limiting groove 16. The outer mold 15 can then be removed and replaced with another model. When installation is required, similarly, move the lever 33 to rotate the second turntable 7 to move the adjacent limiting pins 11 away. After the outer mold 15 is placed in the predetermined position, release the lever 33. The spring 10 rebounds, causing the adjacent limiting pins 11 to move closer together. Finally, the limiting pins 11 enter the interior of the limiting groove 16. The outer mold 15 is used for limiting. A spring 10 is fixedly connected to the inner wall of the spring groove 9. The spring 10 can be used to reset the limiting pin 11. One end of the spring 10 is fixedly connected to the side wall of the limiting pin 11. A toggle groove 34 is opened on the inner surface of the rotating groove 6. A toggle block 33 is fixedly connected to the outer surface of the second turntable 7. Toggle block 33 can drive the second turntable 7 to rotate. The toggle block 33 is located inside the toggle groove 34. A load-bearing plate 18 is fixedly connected to the side wall of the mounting block 2. The load-bearing plate 18 can limit and support the first turntable 5. An arc groove is opened on the upper surface of the load-bearing plate 18. The arc groove fits with the outer surface of the first turntable 5. A discharge pipe 35 is fixedly connected to the inner surface of the mounting block 2. The tube rod after reverse extrusion molding extends out from the discharge pipe 35.

[0044] A first support plate 19 is fixedly connected to the upper surface of the workbench 1. A first hydraulic cylinder 20 is fixedly connected to the upper surface of the first support plate 19. A moving rod 21 is fixedly connected to the right side of the first hydraulic cylinder 20. A protective shell 22 is fixedly connected to the end of the moving rod 21 away from the first hydraulic cylinder 20. The first support plate 19 is used to support the first hydraulic cylinder 20. The operation of the first hydraulic cylinder 20 can drive the moving rod 21 to move left and right. A second hydraulic cylinder 23 is fixedly connected to the inner surface of the protective shell 22. A perforating needle 25 is fixedly connected to the right side of the second hydraulic cylinder 23. A pressing pad 24 is sleeved on the outer surface of the perforating needle 25. The pressing pad 24 is fixedly connected to the right side of the second hydraulic cylinder 23. The perforating needle 25 is used to drill a hole in the middle of the aluminum rod to be processed. The front end of component 5 is equipped with a mold core containing an inner mold, which determines the inner diameter of the formed aluminum tube. The extrusion pad 24 acts as a buffer between the second hydraulic cylinder 23 and the aluminum rod to be processed, preventing direct contact between them. A connecting plate 26 is fixedly connected to the right side of the protective shell 22, and a placement tube 27 is fixedly connected to the side wall of the connecting plate 26. The placement tube 27 is used to place the aluminum rod to be processed inside the placement tube 27. When reverse extrusion of the aluminum rod is required, the aluminum rod is first placed inside the placement tube 27, which then drives the first hydraulic cylinder 20 to move the moving rod 21 to the right, thereby moving the protective shell 22, connecting plate 26, and placement tube 27 to the right until they reach the placement tube 27. When the inner aluminum rod contacts the outer mold 15, it stops moving. Then, the second hydraulic cylinder 23 operates, causing the piercing needle 25 to extend. The piercing needle 25 extends until it is in the same vertical position as the outer mold 15, at which point it stops moving. Then, the first hydraulic cylinder 20 continues to operate, causing the moving rod 21, protective shell 22, second hydraulic cylinder 23, connecting plate 26, and placement tube 27 to move to the right. Simultaneously, as the second hydraulic cylinder 23 moves to the right, the piercing needle 25 shortens, ensuring that the vertical position of the farthest end of the piercing needle 25 is always in the same vertical position as the outer mold 15. At this point, the aluminum rod to be processed is reverse-extruded and formed. The formed seamless aluminum tube extends from the discharge pipe 35. The remaining portion of the aluminum rod that cannot be reverse-extruded can be cut off by an external cutting device, resulting in a seamless aluminum tube. The first support... A connecting block 28 is fixedly connected to the side wall of plate 19. The connecting block 28 is used to connect the first support plate 19 and the second support plate 29 together. The second support plate 29 is fixedly connected to the side of the connecting block 28 away from the first support plate 19. A limiting plate 30 is fixedly connected to the inner surface of the second support plate 29. There are two limiting plates 30. A first sliding groove 31 is opened on the side wall of the protective shell 22. The limiting plate 30 is located inside the first sliding groove 31. A second sliding groove 32 is opened on the side wall of the connecting plate 26. The limiting plate 30 is located inside the second sliding groove 32. The limiting plate 30 can limit and support the protective shell 22 and the connecting plate 26, so that the protective shell 22, the connecting plate 26 and the placement tube 27 can move with the movement of the moving rod 21.

[0045] The lower surface of the workbench 1 is fixedly connected with four legs 36, which can support the workbench 1.

[0046] Working principle: When it is necessary to change the outer diameter of the processed seamless aluminum tube, simply control the motor 3 to drive the rotating shaft 4 and the first turntable 5 to rotate, changing the position of the outer mold 15 aligned with the discharge pipe 35. When it is necessary to replace the outer mold 15 with more models, simply move the lever 33 to drive the second turntable 7 to rotate. Due to the presence of the inclined groove 14, it can drive the adjacent sliding pins 13 to move away from each other, thereby driving the adjacent moving pins 12 and the limiting pins 11 to move away from each other. The spring 10 contracts, allowing the limiting pins 11 to disengage from the limiting groove 16, thus allowing the outer mold 15 to be removed and replaced with other models of outer mold 15. When installation is required, similarly move the lever 33 to drive the second turntable 7 to move the adjacent limiting pins 11 away. After the outer mold 15 is placed in the predetermined position, release the lever 33. The spring 10 rebounds, driving the adjacent limiting pins 11 to move closer to each other. Finally, the limiting pins 11 enter the interior of the limiting groove 16 to limit the outer mold 15. When it is necessary to reverse extrude the aluminum rod to be processed... First, the aluminum rod to be processed is placed inside the placement tube 27. Then, the first hydraulic cylinder 20 is driven to move the moving rod 21 to the right, which in turn moves the protective shell 22, the connecting plate 26, and the placement tube 27 to the right until the aluminum rod inside the placement tube 27 contacts the outer mold 15 and stops moving. Then, the second hydraulic cylinder 23 is driven to extend the piercing needle 25. The piercing needle 25 extends to the same vertical position as the outer mold 15 and stops moving. Then, the first hydraulic cylinder 20 continues to work, driving the moving rod 21, the protective shell 22, the second hydraulic cylinder 23, the connecting plate 26, and the placement tube 27 to the right. At the same time, as the second hydraulic cylinder 23 moves to the right, the piercing needle 25 shortens, so that the vertical position of the farthest end of the piercing needle 25 is always in the same vertical position as the outer mold 15. At this time, the aluminum rod to be processed is reverse-extruded and formed. The formed seamless aluminum tube extends out from the discharge tube 35. Finally, the remaining part of the aluminum rod that cannot be reverse-extruded and formed can be cut off by an external cutting device. After cutting off, a seamless aluminum tube can be obtained.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic press for reverse extrusion of aluminum alloy tubes and bars, comprising a worktable (1), characterized in that: A mounting block (2) is fixedly connected to the upper surface of the workbench (1). A motor (3) is fixedly connected to the side wall of the mounting block (2). A rotating shaft (4) is fixedly connected to the output end of the motor (3). A first turntable (5) is fixedly connected to the output end of the rotating shaft (4). A rotating groove (6) is provided inside the first turntable (5). There are four rotating grooves (6). A second turntable (7) is movably installed on the inner wall of the rotating groove (6). An inclined groove (14) is provided on the side wall of the second turntable (7). There are multiple inclined grooves (14). A moving groove (8) is provided on the inner wall of the rotating groove (6). There are multiple moving grooves (8). A spring groove (9) is provided on the inner wall of the groove (8). A limiting pin (11) is provided inside the spring groove (9). A movable pin (12) is fixedly connected to the side wall of the limiting pin (11). A sliding pin (13) is fixedly connected to the end of the movable pin (12) away from the limiting pin (11). The movable pin (12) is located inside the movable groove (8). The sliding pin (13) is located inside the inclined groove (14). An installation groove (17) is provided on the inner wall of the spring groove (9). An outer mold (15) is provided inside the installation groove (17). A limiting groove (16) is provided on the outer surface of the outer mold (15). The limiting pin (11) is located inside the limiting groove (16).

2. The aluminum alloy tube / bar reverse extrusion hydraulic press according to claim 1, characterized in that: A spring (10) is fixedly connected to the inner wall of the spring groove (9). One end of the spring (10) is fixedly connected to the side wall of the limiting pin (11). A toggle groove (34) is provided on the inner surface of the rotating groove (6). A toggle block (33) is fixedly connected to the outer surface of the second turntable (7). The toggle block (33) is located inside the toggle groove (34).

3. The aluminum alloy tube / bar reverse extrusion hydraulic press according to claim 1, characterized in that: The mounting block (2) has a load-bearing plate (18) fixedly connected to its side wall. The upper surface of the load-bearing plate (18) has an arc-shaped groove that fits against the outer surface of the first turntable (5). The inner surface of the mounting block (2) has a discharge pipe (35) fixedly connected to it.

4. The aluminum alloy tube / bar reverse extrusion hydraulic press according to claim 1, characterized in that: A first support plate (19) is fixedly connected to the upper surface of the workbench (1), a first hydraulic cylinder (20) is fixedly connected to the upper surface of the first support plate (19), a moving rod (21) is fixedly connected to the right side of the first hydraulic cylinder (20), and a protective shell (22) is fixedly connected to the end of the moving rod (21) away from the first hydraulic cylinder (20).

5. The aluminum alloy tube / bar reverse extrusion hydraulic press according to claim 4, characterized in that: The inner surface of the protective shell (22) is fixedly connected to a second hydraulic cylinder (23), and the right side of the second hydraulic cylinder (23) is fixedly connected to a perforating needle (25). The outer surface of the perforating needle (25) is covered with a compression pad (24), and the compression pad (24) is fixedly connected to the right side of the second hydraulic cylinder (23).

6. The aluminum alloy tube / bar reverse extrusion hydraulic press according to claim 5, characterized in that: A connecting plate (26) is fixedly connected to the right side of the protective shell (22), and a placement tube (27) is fixedly connected to the side wall of the connecting plate (26).

7. The aluminum alloy tube / bar reverse extrusion hydraulic press according to claim 6, characterized in that: A connecting block (28) is fixedly connected to the side wall of the first support plate (19). A second support plate (29) is fixedly connected to the side of the connecting block (28) away from the first support plate (19). A limiting plate (30) is fixedly connected to the inner surface of the second support plate (29). There are two limiting plates (30). A first sliding groove (31) is opened on the side wall of the protective shell (22). The limiting plate (30) is located inside the first sliding groove (31). A second sliding groove (32) is opened on the side wall of the connecting plate (26). The limiting plate (30) is located inside the second sliding groove (32).

8. The aluminum alloy tube / bar reverse extrusion hydraulic press according to claim 1, characterized in that: The lower surface of the workbench (1) is fixedly connected with four legs (36).

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