A magnetic tile rotary forming die

Abstract

The utility model discloses a kind of magnetic shoe rotary forming die, comprising: support body;Top support frame, top support frame is fixedly installed at the top of support body, the beneficial effects of the utility model are: a plurality of sliding columns are equally spaced on No. 1 outer fixing sleeve and No. 2 outer fixing sleeve, four top rods are symmetrically fixed to the top end of No. 1 sliding column, bottom die is set on the top end of top rod, forming briquetting is fixedly installed by bolt at the bottom end of No. 2 sliding column, can simultaneously form multiple magnetic shoe operation, greatly improve production efficiency, top support frame top is provided with worm gear reducer, motor output end is fixed to worm gear reducer input end, worm gear reducer output end is fixed to rotating support column, motor provides power after deceleration by worm gear reducer and is transferred to rotating support column, and worm gear reducer has self-locking function, can guarantee the stability in the rotating process of rotating support column, make the whole mould operation more stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of molding die technology, specifically a magnetic tile rotary molding die. Background Technology

[0002] In the field of magnetic tile manufacturing, magnetic tile forming is a key process. Its forming quality and efficiency directly affect the performance and production cost of subsequent products. Traditional magnetic tile forming molds have many limitations in structure and function, making it difficult to meet the demands of modern industrial production for high efficiency, precision, and stability. Early magnetic tile forming molds mostly adopted simple mechanical structures, usually single-station designs. Such molds can only form one magnetic tile at a time, resulting in extremely low production efficiency. In mass production, repeated feeding, forming, and unloading operations are required, which not only consumes a lot of time and manpower, but also makes it easy for human error to occur due to frequent operations, leading to large fluctuations in product quality. Utility Model Content

[0003] The purpose of this utility model is to provide a magnetic tile rotation forming mold to solve the problem that the mold mentioned in the background art can only perform forming operation on one magnetic tile at a time, resulting in extremely low production efficiency. In mass production, repeated operations such as feeding, forming, and unloading are required, which not only consumes a lot of time and manpower, but also makes it easy for human error to occur due to frequent operation steps, resulting in large fluctuations in product quality.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a magnetic tile rotation forming mold, comprising:

[0005] Support body;

[0006] Top support frame, which is fixedly installed on the top of the support body;

[0007] A support base is provided on the top of the support body. A rotating support column is rotatably installed inside the support base, and the rotating support column is rotatably connected to the top support frame.

[0008] The first outer fixing sleeve is set on the outside of the rotating support column. The first outer fixing sleeve is rotatably set on the outside of the first outer fixing sleeve. The first outer fixing sleeve is fixed to the top support frame by bolts. Twelve second sliding columns are equidistantly slidably arranged inside the first outer fixing sleeve.

[0009] A top rotating platform is fixed to the outside of the rotating support column. A second outer fixing sleeve is fixed to the bottom of the top rotating platform. The second outer fixing sleeve is fixed to the outside of the rotating support column. Twelve first sliding columns are equidistantly arranged inside the second outer fixing sleeve.

[0010] The second external fixed cylinder frame is rotatably mounted on the outside of the second external fixed sleeve. The second external fixed cylinder frame is rotatably connected to the top rotating platform. The bottom of the second external fixed cylinder frame is fixedly connected to the support base. The outer side of the first external fixed cylinder frame is provided with a first lifting guide groove. One side of the second sliding column is fixedly connected to a first side fixed rod that cooperates with the first lifting guide groove. The first side fixed rod is slidably connected to the first external fixed sleeve.

[0011] The No. 2 lifting guide groove is located on the inner side of the No. 2 outer fixed cylinder. The No. 1 sliding column is fixedly connected to one side of the No. 2 side fixed rod, which cooperates with the No. 2 lifting guide groove. The No. 2 side fixed rod is slidably connected to the No. 2 outer fixed sleeve.

[0012] The forming part is located at one end of the second sliding column and the first sliding column.

[0013] As a preferred embodiment of this utility model: the forming part includes a top rod, a bottom mold, a groove and a forming pressure block. The top of the top rotating table is provided with twelve grooves at equal intervals. The top of the first sliding column is symmetrically fixed with four top rods. The top rods are slidably connected to the top rotating table. The top of the top rod is provided with a bottom mold. The bottom of the second sliding column is fixedly installed with a forming pressure block.

[0014] As a preferred embodiment of this utility model: the top of the support base is fixedly connected to two top guide supports, and the bottom of the first sliding column is provided with rolling balls.

[0015] As a preferred embodiment of this utility model: two side fixing frames are fixedly connected to the top of the supporting body, a collection box is provided on the top of the side fixing frame, a discharge guide plate that cooperates with the collection box is fixedly connected to the top of the side fixing frame, and a discharge baffle is fixedly installed on one side of the discharge guide plate by bolts.

[0016] As a preferred embodiment of this utility model: two limiting sliders are symmetrically fixed to the outer sides of the first sliding column and the second sliding column, and the inner sides of the first outer fixing sleeve and the second outer fixing sleeve are provided with limiting grooves that cooperate with the limiting sliders, and the limiting sliders are slidably connected to the limiting grooves.

[0017] As a preferred embodiment of this utility model: a worm gear reducer is provided on the top of the top support frame, the output end of the worm gear reducer is fixedly connected to the rotating support column, and a motor is fixedly installed on the top of the top support frame by bolts, the output end of the motor is fixedly connected to the input end of the worm gear reducer.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model has multiple sliding columns evenly spaced on both the first and second outer fixing sleeves. Four top rods are symmetrically fixed to the top of the first sliding column, and a bottom mold is installed at the top of each top rod. A forming pressure block is fixed to the bottom of the second sliding column by bolts. This allows for the simultaneous forming of multiple magnetic tiles, greatly improving production efficiency. A worm gear reducer is installed at the top of the top support frame. The motor output is fixedly connected to the input end of the worm gear reducer, and the output end of the worm gear reducer is fixedly connected to the rotating support column. The motor provides power, which is then reduced by the worm gear reducer. After deceleration, the speed is transmitted to the rotating support column. The worm gear reducer has a self-locking function, which can ensure the stability of the rotating support column during rotation, making the entire mold operation smoother and more reliable. Two limit sliders are symmetrically fixed to the outer sides of the first and second sliding columns. Limiting grooves that cooperate with the limit sliders are opened inside the first and second outer fixed sleeves. The limit sliders and the limit grooves are slidably connected, which restricts the movement trajectory of the first and second sliding columns, prevents them from deviating during lifting, ensures the accurate matching of the forming block and the bottom mold, and improves the quality and precision of magnetic tile forming. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is the left view of the present invention;

[0021] Figure 3 This is a schematic diagram of the molding block structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the No. 1 lifting guide groove structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the No. 2 side fixing rod structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the external fixing sleeve structure of this utility model;

[0025] Figure 7 This is a schematic diagram of the No. 1 sliding column structure of this utility model;

[0026] Figure 8 This is a schematic diagram of the lifting guide groove structure of this utility model.

[0027] In the diagram: 1. Support body; 2. Top support frame; 3. Rotating column; 4. Worm gear reducer; 5. Motor; 6. No. 1 outer fixed sleeve; 7. No. 1 outer fixed cylinder frame; 8. No. 2 outer fixed cylinder frame; 9. No. 2 outer fixed sleeve; 10. Support base; 11. Top guide support; 12. No. 1 sliding column; 13. Ball bearing; 14. Top rod; 15. Bottom mold; 16. Groove; 17. No. 2 sliding column; 18. No. 1 side fixed rod; 19. No. 1 lifting guide groove; 20. No. 2 lifting guide groove; 21. No. 2 side fixed rod; 22. Limiting slider; 23. Limiting slide groove; 24. Feed frame; 25. Side fixed frame; 26. Discharge guide plate; 27. Collection box; 28. Forming block; 29. ​​Top rotating table; 30. Discharge baffle. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1 to 8This utility model provides a technical solution: a magnetic tile rotation forming mold, comprising: a supporting body 1; a top support frame 2 fixedly installed on the top of the supporting body 1 by bolts; a support base 10 fixedly connected to the top of the supporting body 1, wherein a rotating support column 3 is rotatably arranged inside the support base 10, and the rotating support column 3 is rotatably connected to the top support frame 2; a first outer fixing sleeve 6 fixedly connected to the outside of the rotating support column 3, wherein a first outer fixing cylinder 7 is rotatably arranged on the outside of the first outer fixing sleeve 6, and the first outer fixing cylinder 7 is fixedly installed to the top support frame 2 by bolts; and twelve second sliding columns 17 are equidistantly arranged inside the first outer fixing sleeve 6; a top rotating platform 29 fixedly connected to the outside of the rotating support column 3, wherein a second outer fixing sleeve 9 is fixedly connected to the bottom of the top rotating platform 29, and the second outer fixing sleeve 9 is fixedly connected to the outside of the rotating support column 3. The interior is equidistantly arranged with twelve sliding columns 12; the second outer fixed cylinder 8 is rotatably arranged on the outside of the second outer fixed sleeve 9, the second outer fixed cylinder 8 is rotatably connected to the top rotating platform 29, the bottom of the second outer fixed cylinder 8 is fixedly connected to the support base 10, the outer side of the first outer fixed cylinder 7 is provided with a first lifting guide groove 19, one side of the second sliding column 17 is fixedly connected with a first side fixed rod 18 that cooperates with the first lifting guide groove 19, the first side fixed rod 18 is slidably connected to the first outer fixed sleeve 6; the second lifting guide groove 20 is provided on the inside of the second outer fixed cylinder 8, one side of the first sliding column 12 is fixedly connected with a second side fixed rod 21 that cooperates with the second lifting guide groove 20, the second side fixed rod 21 is slidably connected to the second outer fixed sleeve 9; the forming part is provided at one end of the second sliding column 17 and the first sliding column 12.

[0030] It should be noted that in this embodiment, the top support frame 2 is fixedly installed on the top of the support body 1 by bolts. A motor 5 is fixedly installed on the top of the top support frame 2 by bolts. The motor 5 serves as the power source for the entire mold. After the motor 5 starts, its output end transmits power to the input end of the worm gear reducer 4, which is fixedly connected to it. The worm gear reducer 4 is located on the top of the top support frame 2. It can convert the high-speed rotation output by the motor 5 into low-speed rotation, and transmit the reduced power to the rotating support column 3 through its output end, causing the rotating support column 3 to begin low-speed stable rotation. Because the worm gear reducer 4 has a self-locking function, it can ensure the stability of the rotating support column 3 during rotation, preventing accidental rotation or shaking of the rotating support column 3 due to external factors, thus ensuring the stability of the entire mold. The smooth operation of the mold is ensured. When the rotating support 3 rotates, it drives the No. 1 outer fixed sleeve 6 and the top rotating platform 29, which are fixed to its outer side, to rotate together. Twelve No. 2 sliding columns 17 are equidistantly arranged inside the No. 1 outer fixed sleeve 6. A No. 1 side fixed rod 18 is fixed to one side of the No. 2 sliding column 17, which cooperates with the No. 1 lifting guide groove 19 opened on the outer side of the No. 1 outer fixed cylinder 7. The No. 1 side fixed rod 18 is slidably connected to the No. 1 outer fixed sleeve 6. The bottom of the top rotating platform 29 is fixed to the No. 2 outer fixed sleeve 9. Twelve No. 1 sliding columns 12 are equidistantly arranged inside the No. 2 outer fixed sleeve 9. A No. 2 side fixed rod 21 is fixed to one side of the No. 1 sliding column 12, which cooperates with the No. 2 lifting guide groove 20 opened on the inner side of the No. 2 outer fixed cylinder 8. The No. 2 side fixed rod 21 is slidably connected to the No. 1 outer fixed sleeve 6. The second outer fixing sleeve 9 is slidably connected. During the rotation of the rotating support column 3, which drives the first outer fixing sleeve 6 and the second outer fixing sleeve 9 to rotate, the first side fixing rod 18 slides in the first lifting guide groove 19, and the second side fixing rod 21 slides in the second lifting guide groove 20. Due to the shape design of the first lifting guide groove 19 and the second lifting guide groove 20, the first side fixing rod 18 and the second side fixing rod 21 drive the second sliding column 17 and the first sliding column 12 to move up and down respectively during the rotation. When the second sliding column 17 drives the forming pressure block 28 to move to the lowest position, the top rod 14 and the bottom mold 15 at the top of the first sliding column 12 are at the lowest position. Two limiting sliders 22 are symmetrically fixed to the outer sides of the first sliding column 12 and the second sliding column 17. Both the first outer fixing sleeve 6 and the second outer fixing sleeve 9 have internal limiting grooves 23 that cooperate with the limiting slider 22. The limiting slider 22 is slidably connected to the limiting groove 23. This structure restricts the movement trajectory of the first sliding column 12 and the second sliding column 17, allowing them to move in a straight line along the direction of the limiting groove 23, preventing them from deviating during lifting and lowering, and ensuring the accuracy of the movement. The support base 10 has two top guide supports 11 fixed to its top. The bottom of the first sliding column 12 is provided with rolling balls 13. The top guide supports 11 can provide a certain guiding and supporting effect for the lifting and lowering movement of the first sliding column 12, while the rolling balls 13 convert the sliding friction between the first sliding column 12 and the top guide supports 11 into rolling friction, greatly reducing the friction force.To ensure smoother lifting and lowering of the first sliding column 12, four top rods 14 are symmetrically fixed to the top of the first sliding column 12. The top rods 14 are slidably connected to the top rotating table 29. A bottom mold 15 is set at the top of the top rods 14. A forming pressure block 28 is fixedly installed at the bottom of the second sliding column 17 by bolts. When the first sliding column 12 and the second sliding column 17 move up and down under the guidance of the first lifting guide groove 19 and the second lifting guide groove 20, the forming pressure block 28 and the bottom mold 15 move closer or further apart. During the forming process, with the relative movement of the first sliding column 12 and the second sliding column 17, the forming pressure block 28 presses down on the magnetic tile material placed on the bottom mold 15. Under the pressure, the magnetic tile material is pressed into the required shape, realizing the forming process of the magnetic tile. Since multiple sliding columns are equidistantly arranged on the first outer fixing sleeve 6 and the second outer fixing sleeve 9, multiple magnetic tiles can be formed simultaneously, greatly improving production efficiency. Support body 1 Two side fixing brackets 25 are fixed to the top, and a collection box 27 is set on the top of the side fixing brackets 25. A discharge guide plate 26 that cooperates with the collection box 27 is fixed to the top of the side fixing brackets 25. A discharge baffle 30 is fixedly installed on one side of the discharge guide plate 26 by bolts. After the magnetic tile is formed, the discharge baffle 30 blocks the rotating magnetic tile after forming, so that the formed magnetic tile can slide down along the discharge guide plate 26 into the collection box 27, realizing automatic collection and facilitating subsequent processing and transportation of the formed magnetic tile. The magnetic tile rotary forming mold is powered by a motor 5, which is reduced by a worm gear reducer 4 and transmitted to the rotating support column 3, driving the relevant components to rotate. The first lifting guide groove 19 and the second lifting guide groove 20 make the first sliding column 12 and the second sliding column 17 move up and down, so that the forming pressure block 28 cooperates with the bottom mold 15 to complete the magnetic tile forming. Finally, the discharge guide plate 26 and the collection box 27 realize the automatic collection of the magnetic tile. The whole process is efficient, stable and highly automated.

[0031] In one embodiment, such as Figures 1 to 8 As shown, the molding part includes a top rod 14, a bottom mold 15, a groove 16 and a molding block 28. The top of the top rotating table 29 has twelve grooves 16 equidistantly spaced. The top of the first sliding column 12 is symmetrically fixed with four top rods 14. The top rods 14 are slidably connected to the top rotating table 29. The top of the top rods 14 is provided with the bottom mold 15. The bottom of the second sliding column 17 is fixedly installed with the molding block 28 by bolts.

[0032] It should be noted that in this embodiment, during the rotation of the rotating support column 3 and the related components, the first sliding column 12 and the second sliding column 17 move up and down under the guidance of the first lifting guide groove 19 and the second lifting guide groove 20, respectively, so that the forming pressure block 28 cooperates with the bottom mold 15 to realize the forming process of the magnetic tile. This structure can perform forming operations on multiple magnetic tiles, which improves production efficiency.

[0033] In one embodiment, such as Figures 1 to 8 As shown, the top of the support base 10 is fixed with two top guide supports 11, and the bottom of the first sliding column 12 is provided with rolling balls 13.

[0034] It should be noted that in this embodiment, the top guide support 11 can play a certain guiding and supporting role in the lifting and lowering movement of the first sliding column 12, while the setting of the ball bearing 13 transforms the sliding friction between the first sliding column 12 and the top guide support 11 into rolling friction, which greatly reduces the friction force.

[0035] In one embodiment, such as Figures 1 to 8 As shown, the top of the supporting body 1 is fixed with two side fixing frames 25. A collection box 27 is provided on the top of the side fixing frame 25. A discharge guide plate 26 that cooperates with the collection box 27 is fixed on the top of the side fixing frame 25. A discharge baffle 30 is fixedly installed on one side of the discharge guide plate 26 by bolts.

[0036] It should be noted that in this embodiment, after the magnetic tile is formed, the discharge baffle 30 blocks the rotating magnetic tile after forming, so that the formed magnetic tile can slide down along the discharge guide plate 26 into the collection box 27 to achieve automatic collection.

[0037] In one embodiment, such as Figures 1 to 8 As shown, two limiting sliders 22 are symmetrically fixed to the outer sides of sliding column 12 and sliding column 17. The inner sides of outer fixing sleeve 6 and outer fixing sleeve 9 are provided with limiting grooves 23 that cooperate with the limiting sliders 22. The limiting sliders 22 and limiting grooves 23 are slidably connected.

[0038] It should be noted that in this embodiment, the movement trajectories of the first sliding column 12 and the second sliding column 17 are restricted, so that they can only move in a straight line along the direction of the limiting slide groove 23, preventing them from deviating during the lifting process, ensuring the accurate fit between the forming pressure block 28 and the bottom mold 15, and improving the quality and precision of the magnetic tile forming.

[0039] In one embodiment, such as Figures 1 to 8 As shown, a worm gear reducer 4 is installed on the top of the top support frame 2. The output end of the worm gear reducer 4 is fixedly connected to the rotating support column 3. A motor 5 is fixedly installed on the top of the top support frame 2 by bolts. The output end of the motor 5 is fixedly connected to the input end of the worm gear reducer 4.

[0040] It should be noted that in this embodiment, the motor 5 provides power, and the high-speed rotation of the motor 5 is converted into low-speed rotation through the worm gear reducer 4 and transmitted to the rotating support 3. The worm gear reducer 4 has a self-locking function, which can ensure the stability of the rotating support 3 during the rotation process, making the entire mold more stable and reliable during operation. At the same time, the forming speed of the mold can be controlled by adjusting the speed of the motor 5 according to production needs.

[0041] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic tile rotation molding die, characterized in that, include: Support body (1); Top support frame (2), the top support frame (2) is fixedly installed on the top of the support body (1); Support base (10) is set on the top of support body (1). Rotating support column (3) is rotatably arranged inside the support base (10). Rotating support column (3) is rotatably connected to top support frame (2). The first outer fixing sleeve (6) is set on the outside of the rotating support column (3). The first outer fixing sleeve (6) is rotatably set on the outside of the first outer fixing sleeve (6). The first outer fixing sleeve (7) is fixedly installed with the top support frame (2) by bolts. Twelve second sliding columns (17) are equidistantly slidably arranged inside the first outer fixing sleeve (6). Top rotating platform (29) is fixed to the outside of rotating support column (3). The bottom of the top rotating platform (29) is fixed to a second outer fixing sleeve (9). The second outer fixing sleeve (9) is fixed to the outside of rotating support column (3). Twelve first sliding columns (12) are equidistantly arranged inside the second outer fixing sleeve (9). The second external fixing cylinder (8) is rotatably set on the outside of the second external fixing sleeve (9). The second external fixing cylinder (8) is rotatably connected to the top rotating platform (29). The bottom of the second external fixing cylinder (8) is fixedly connected to the support seat (10). The first external fixing cylinder (7) has a first lifting guide groove (19) on its outside. The second sliding column (17) has a first side fixing rod (18) fixedly connected to one side, which cooperates with the first lifting guide groove (19). The first side fixing rod (18) is slidably connected to the first external fixing sleeve (6). The second lifting guide groove (20) is located on the inner side of the second outer fixed cylinder (8). The first sliding column (12) is fixedly connected to a second side fixed rod (21) that cooperates with the second lifting guide groove (20). The second side fixed rod (21) is slidably connected to the second outer fixed sleeve (9). The forming part is located at one end of the second sliding column (17) and the first sliding column (12).

2. The magnetic tile rotation forming mold according to claim 1, characterized in that: The forming part includes a top rod (14), a bottom mold (15), a groove (16) and a forming block (28). The top of the top rotating platform (29) is provided with twelve grooves (16) at equal intervals. The top of the first sliding column (12) is symmetrically fixed with four top rods (14). The top rods (14) are slidably connected to the top rotating platform (29). The top of the top rods (14) is provided with a bottom mold (15). The bottom of the second sliding column (17) is fixedly installed with a forming block (28).

3. The magnetic tile rotation molding die according to claim 1, characterized in that: The top of the support base (10) is fixedly connected to two top guide supports (11), and the bottom of the first sliding column (12) is provided with rolling balls (13).

4. The magnetic tile rotation forming mold according to claim 1, characterized in that: The top of the support body (1) is fixed with two side fixing frames (25). A collection box (27) is provided on the top of the side fixing frame (25). A discharge guide plate (26) that cooperates with the collection box (27) is fixed on the top of the side fixing frame (25). A discharge baffle (30) is fixedly installed on one side of the discharge guide plate (26) by bolts.

5. The magnetic tile rotation forming mold according to claim 1, characterized in that: Two limiting sliders (22) are symmetrically fixed to the outer sides of the first sliding column (12) and the second sliding column (17). The first outer fixing sleeve (6) and the second outer fixing sleeve (9) are both provided with limiting grooves (23) that cooperate with the limiting sliders (22). The limiting sliders (22) and the limiting grooves (23) are slidably connected.

6. The magnetic tile rotation molding die according to claim 1, characterized in that: The top of the top support frame (2) is provided with a worm gear reducer (4), the output end of the worm gear reducer (4) is fixedly connected to the rotating support column (3), and the top of the top support frame (2) is fixedly installed with a motor (5) by bolts, the output end of the motor (5) is fixedly connected to the input end of the worm gear reducer (4).

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