Rotational molding machine rotating arm mechanism and rotational molding machine

Abstract

The utility model discloses a rotational molding machine rotating arm mechanism and a rotational molding machine, and belongs to the technical field of rotational molding machines, the rotational molding machine rotating arm mechanism comprises a main supporting arm, trays are arranged on both sides of the main supporting arm, each tray is connected with the main supporting arm through a bearing, each tray is provided with a mold, and the mold is connected with the main supporting arm through a bearing. And a second driving structure for driving the tray to rotate is arranged in the main supporting arm. The trays are arranged on the upper face and the lower face of the main supporting arm, each tray is connected with the corresponding die, two dies on one set of equipment can work at the same time, compared with single-time machining of a single die, efficiency is greatly improved, and the second driving structure is arranged in the main supporting arm and does not occupy extra space.

Description

Technical Field

[0001] This utility model relates to the technical field of rotational molding machines, and in particular to a rotational molding machine rotating arm mechanism and a rotational molding machine. Background Technology

[0002] Rotational molding, also known as rotational molding, is a method of hollow plastic molding. The process involves first adding plastic raw material into a mold, then continuously rotating and heating the mold along two perpendicular axes. Under the influence of gravity and heat, the plastic raw material gradually and evenly coats, melts, and adheres to the entire surface of the mold cavity, forming the desired shape. The final product is then cooled and solidified.

[0003] Currently, most rotational molding machines on the market use L-shaped support arms for mold support. For example, patent application number 202322905621.1 discloses an L-arm electrically heated rotational molding machine, specifically including a base, a low-voltage electrical box, a high-voltage electrical box, a mounting frame, a first drive mechanism, a rotating support arm, a second drive mechanism, a clamping plate, an aviation plug, a cooling mechanism, a main shaft conductive slip ring, and a secondary shaft conductive slip ring. The low-voltage electrical box, the mounting frame, and the high-voltage electrical box are sequentially arranged on top of the base. By arranging the rotating support arm in an L-shape and placing the clamping plate on the rotating support arm, the rotation directions of the clamping plate and the rotating support arm are perpendicular to each other. The mold is fixed by the clamping plate, and the aviation plug is fixed on the clamping plate, allowing the plug on the mold to be inserted into the aviation plug, thereby energizing the heating wire on the mold for heating.

[0004] In the aforementioned technologies, the L-shaped support arm is fixed using a cantilever (one-end support) method, and is driven to rotate by a drive structure. A mold is mounted on top of the L-shaped support arm, while a motor or other equipment to drive the mold's rotation is installed below it. Since both the mold itself and the drive equipment are relatively heavy structures, the L-shaped support arm can only support the weight of one side of the mold and the drive structure. Furthermore, during rotation, due to the long L-shaped power arm and the difficulty in balancing the two sides of the clamping plate, the overall torque eccentricity is relatively large, resulting in high energy consumption for driving the rotation.

[0005] However, in the molding process, the single-mold processing method is inefficient, and how to improve processing efficiency and reduce overall energy consumption has become an urgent problem to be solved. Utility Model Content

[0006] This utility model addresses the shortcomings of existing technologies by providing a rotational molding machine rotating arm mechanism and a rotational molding machine.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0008] A rotational arm mechanism for a rotational molding machine includes a main support arm, on both sides of which are provided trays. Each tray is connected to the main support arm via a bearing, and a mold is mounted on each tray. The main support arm contains a second drive structure for driving the trays to rotate.

[0009] The technical advantages of the above-mentioned technical solution are as follows: both the upper and lower sides of the main support arm are equipped with trays, and each tray is connected to a mold, enabling two molds on one set of equipment to work simultaneously. Compared with the single processing of a single mold, the efficiency is greatly improved. The second drive structure is set inside the main support arm and does not occupy additional space.

[0010] Furthermore, the main support arm is provided with two slip rings, which are respectively connected to two trays.

[0011] Furthermore, the two slip rings are a first slip ring and a second slip ring, with the first slip ring sleeved on the outside of the second slip ring.

[0012] The technical effect of adopting the above technical solution is that the two trays are powered by the first slip ring and the second slip ring being sleeved together. The sleeved method can shorten the distance between the two trays. As the distance between the two trays is shortened, the height of the two side support arms is also shortened, thereby shortening the overall height of the equipment and saving the space occupied by the equipment.

[0013] Furthermore, the two slip rings are pneumatic-hydraulic-electric slip rings, used for gas, hydraulic, and electric supply.

[0014] Furthermore, the second drive structure includes a main motor located inside the main support arm. The main motor is connected to a main reducer. The two ends of the output shaft of the main reducer extend toward the two trays respectively. Two first drive gears are provided on the output shaft of the main reducer. The two trays are provided with a first gear ring that meshes with the first drive gear on their side that is close to each other. The trays are driven to rotate by the meshing of the first drive gear and the first gear ring.

[0015] The technical effect of adopting the above technical solution is as follows: the main motor starts and drives the output shaft of the main reducer to rotate, which drives the two first drive gears to rotate. The rotation of the first drive gears drives the first gear ring to rotate, and the rotation of the first gear ring drives the tray to rotate synchronously, thereby driving the mold to rotate.

[0016] Furthermore, each of the trays is provided with a reinforcing frame.

[0017] The technical effect of adopting the above technical solution is that strengthening the frame can further improve the overall strength of the pallet.

[0018] Secondly, this utility model provides a rotational molding machine.

[0019] A rotational molding machine includes a side support arm, a main support arm rotatably connected to the side support arm, and a first drive structure for driving the main support arm to rotate on the side support arm. The first drive structure includes a side motor located inside the side support arm, the side motor being connected to a side reducer, the output shaft of the side reducer being connected to a second drive gear, the second drive gear meshing with a driven gear, and the driven gear being connected to the end of the main support arm.

[0020] The technical effect of the above technical solution is as follows: two side support arms support the main support arm, and the stability of the main support arm is improved by supporting it at both ends. The first drive structure drives the main support arm to rotate, and the rotation axis of the main support arm is parallel to the ground. The second drive structure is located inside the main support arm and is used to drive the two molds to rotate simultaneously. The rotation axis of the molds is perpendicular to the ground. The two mutually perpendicular structures allow the material in the mold to reach any part of the mold cavity under the action of gravity, thereby achieving a uniform heating effect.

[0021] The output shaft of the side motor drives the side reducer to rotate, which in turn drives the second drive gear to rotate. The rotation of the second drive gear drives the driven gear to rotate. The driven gear is connected to the end of the main support arm. The rotation of the driven gear drives the main support arm to rotate, thereby realizing the overall rotation of the main support arm, the pallet, and the mold.

[0022] Furthermore, a third slip ring is provided inside the side support arm, which is used to supply power to the main support arm.

[0023] Furthermore, a fourth slip ring is provided inside the side support arm for supplying power to the side support arm.

[0024] Furthermore, the third and fourth slip rings are pneumatic-hydraulic-electric slip rings, used for power supply, pneumatic and hydraulic supply. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a rotational molding machine rotating arm mechanism according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a rotational molding machine rotating arm mechanism, highlighting the first connecting plate and the second connecting plate, according to an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of a rotational molding machine rotating arm mechanism, highlighting the third connecting plate, the first slip ring, and the rotary bearing, according to an embodiment of the present invention.

[0028] Figure 4 This is a cross-sectional view of a rotational molding machine rotating arm mechanism, highlighting the first and second slip rings, according to an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of the rotating arm mechanism of a rotational molding machine with a prominent reinforcing frame, according to an embodiment of the present invention.

[0030] Figure 6 This is a cross-sectional view of a rotational molding machine rotating arm mechanism, highlighting the first drive gear and the first gear ring, according to an embodiment of the present invention.

[0031] Figure 7 This is a cross-sectional view of a rotational molding machine rotating arm mechanism with two slip rings fitted together, according to an embodiment of the present invention.

[0032] Figure 8 This is a schematic diagram of a rotational molding machine rotating arm mechanism in which the two slip ring stators are integrated into one unit, according to an embodiment of the present invention.

[0033] Figure 9 This is a schematic diagram of the overall structure of a rotational molding machine according to an embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of a rotational molding machine with a prominent third slip ring according to an embodiment of the present invention;

[0035] Figure 11 This is a cross-sectional view of a rotational molding machine highlighting the first drive structure according to an embodiment of the present invention;

[0036] Figure 12 This is a partial schematic diagram of a rotational molding machine comprising a prominent side motor, a side reducer, and a second drive gear, according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached drawings: 1. Main support arm; 2. Side support arm; 3. First drive structure; 4. Second drive structure; 5. Tray; 6. Reinforcing frame; 7. Main motor; 8. Main reducer; 9. First drive gear; 10. First gear ring; 11. First slip ring; 12. Second slip ring; 13. Side motor; 14. Side reducer; 15. Second drive gear; 16. Driven gear; 17. Third slip ring; 18. First connecting plate; 19. Second connecting plate; 20. Third connecting plate; 21. Slewing bearing; 22. Stator; 23. First rotor; 24. Second rotor. Detailed Implementation

[0038] The principles and features of this utility model are described below with reference to all the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0039] This utility model discloses a rotational arm mechanism for a rotational molding machine and a rotational molding machine.

[0040] Example 1

[0041] Reference Figures 1-7A rotational arm mechanism for a rotational molding machine includes a main support arm 1. Both ends of the main support arm 1 are mounted on the side support arms of the rotational molding machine via bearings. The main support arm 1 is a straight arm. Both sides (upper and lower sides) of the main support arm 1 are provided with trays 5. Each tray 5 is equipped with a mold, enabling two molds on one set of equipment to work simultaneously. Compared with the single processing of a single mold in the prior art, the efficiency is greatly improved.

[0042] The main support arm 1 is hollow inside and is equipped with a second drive structure 4 for driving the mold to rotate. In this embodiment, the mold is fixedly mounted on the tray 5, meaning that the rotation of the tray 5 and the mold is synchronized. It can be understood that the second drive structure 4 actually drives the tray 5 to rotate, which in turn drives the mold to rotate synchronously. The second drive structure 4 is located inside the main support arm 1 and does not occupy additional space.

[0043] The main support arm 1 is provided with two slip rings, which are respectively connected to two trays 5. Further, the two slip rings are a first slip ring 11 and a second slip ring 12, with the first slip ring 11 sleeved on the outside of the second slip ring 12, as shown below. Figure 4 As shown, the two molds are powered by a first slip ring 11 and a second slip ring 12 fitted together. This fitted arrangement shortens the distance between the two trays 5. As the distance between the two trays 5 decreases, the height of the two side support arms 2 also decreases, thus reducing the overall height of the equipment and saving space. Specifically, the two slip rings are pneumatic-hydraulic-electric slip rings, providing pneumatic, hydraulic, and electrical power to the two molds.

[0044] It should be noted that, in this embodiment, as Figures 2-4As shown, the first slip ring 11 and the second slip ring 12 are sleeved together. The second slip ring 12 is fixedly provided with a first connecting plate 18 and a second connecting plate 19. The two connecting plates are cuboid in shape. After the first connecting plate 18 is fixed to the outer shell of the second slip ring 12, its two ends are connected to the inner ring of the rotary bearing 21. The inner ring of the rotary bearing 21 does not rotate. The outer shell of the second slip ring 12 is fixed by the first connecting plate 18, that is, the outer shell (stator) of the second slip ring 12 is fixed and does not rotate. The second connecting plate 19 is connected to the internal rotor of the second slip ring 12, and its two ends are connected to the outer ring of the rotary bearing 21. The outer ring of the rotary bearing 21 rotates. The first gear ring 10 is connected to the outer ring of the rotary bearing 21, so when the first gear ring 10 rotates, it can drive the internal rotor of the second slip ring 12 to rotate. Similarly, the first slip ring 11 is also provided with a third connecting plate 20, which has the same rotation principle as the second slip ring 12. The outer ring of the first slip ring 11 is the rotor, and the inner ring is the stator. When the first connecting plate 18 connects to the stator of the second slip ring 12, it also fixes the stator of the first slip ring 11. The third connecting plate 20 is fixed to the first slip ring 11, and the third connecting plate 20 is connected to the outer ring of the slewing bearing 21, so that the outer ring of the slewing bearing 21 can synchronously drive the first slip ring 11 to rotate when it rotates.

[0045] It should be emphasized that the wiring method inside the gas-liquid slip ring in this embodiment adopts the wiring method in the prior art to ensure that the wire will not break during rotation. The wiring method of the gas-liquid slip ring is not described in detail in this embodiment, and the accompanying drawings only show a simplified diagram of two gas-liquid slip rings nested together. The internal structure diagram of the gas-liquid slip ring is not shown.

[0046] It needs to be further emphasized that, for example, two slip rings are used to illustrate this. Figure 7 As shown, the first slip ring 11 includes a first rotor 23 and a first stator. The first stator is sleeved on the outside of the first rotor 23 via a bearing. A conductive ring is provided between the first stator and the first rotor 23. Wires enter from the first stator and are electrically connected to it, then exit from the first rotor 23 and are electrically connected to the mold. Power is supplied to the mold through the rotation of the first rotor 23 and the friction with the guide ring. The second slip ring 12 includes a second rotor 24 and a second stator. The second rotor 24 is connected to the outside of the second stator via a bearing. Its internal structure and the way the wires enter and exit are the same as the first slip ring 11. Wires enter from the second stator and then exit from the second rotor 24 and are electrically connected to another mold. The first slip ring 11 and the second slip ring 12 can be fixed by a fixing structure, such as a fixing plate, connecting the second stator to the outside of the first stator. Alternatively, the two pneumatic-hydraulic slip rings can be sleeved together, and then the stators of the two slip rings can be connected to the bearings via a fixing structure. This achieves the purpose of fixing the stator parts of the two pneumatic-hydraulic slip rings.

[0047] The second drive structure 4 includes a main motor 7 located within the main support arm 1. The main motor 7 is connected to a main reducer 8. The output shaft of the main reducer 8 extends towards two trays 5 at both ends, and two first drive gears 9 are mounted on the output shaft of the main reducer 8. Each of the two rotary bearings 21 is equipped with a first gear ring 10 that meshes with the first drive gears 9. The meshing of the first drive gears 9 and the first gear ring 10 drives the trays 5 to rotate. The first gear ring 10 has a circular ring structure, allowing space for the internal installation of a first slip ring 11 and a second slip ring 12. When the main motor 7 starts, it drives the output shaft of the main reducer 8 to rotate, which in turn drives the two first drive gears 9 to rotate. The rotation of the first drive gears 9 drives the first gear ring 10 to rotate, and the rotation of the first gear ring 10 causes the trays 5 to rotate synchronously, thereby driving the mold to rotate.

[0048] It should be noted that in this embodiment 1, a main reducer 8 drives two first drive gears 9 to rotate, thereby causing the two first gear rings 10 to mesh with the corresponding first drive gears 9, so that the two trays 5 rotate synchronously, ensuring the synchronicity of the rotation of the two trays 5 and the two molds.

[0049] To improve the overall strength of the pallet 5, a reinforcing frame 6 is installed on the side of each pallet 5 away from the mold. The reinforcing frame 6 is assembled from multiple reinforcing tubes, and its shape is similar to or the same as that of the pallet 5. Figure 5 As shown, the reinforcing frame 6 is a hollow square tube. In addition to improving the overall strength, electrical wires and other structures are also led out from the hollow square tube.

[0050] Example 2

[0051] The main difference between Example 2 and Example 1 lies in the arrangement of the two slip rings, such as... Figure 8 As shown, the stator of the two gas-liquid-electric slip rings is integrated, that is, the stator part of the first slip ring 11 and the second slip ring 12 is integrated. In this embodiment, the first slip ring 11 includes a stator and a first rotor 23, and the second slip ring 12 includes a second rotor 24. The stator part of the second slip ring 12 is shared with the stator part of the first slip ring 11. That is, the stator part of the first slip ring 11 and the second slip ring 12 in this embodiment is integrated. A conductive structure, such as a conductive ring, is provided between the stator and the rotor. On this basis, the second rotor 24 is connected to the upper end of the stator through a bearing. After the wire enters from the stator, it is led out from the second rotor 24 and then electrically connected to the mold above. The first rotor 23 is connected to the lower outside of the stator through a bearing. After the wire is led out from the first rotor, it is electrically connected to the mold below.

[0052] This utility model embodiment also discloses a rotational molding machine.

[0053] Reference Figures 9-12A rotational molding machine includes a side support arm 2, a main support arm 1 rotatably connected to the side support arm 2, and a first drive structure 3 for driving the main support arm 1 to rotate on the side support arm 2. The first drive structure 3 includes a side motor 13 located within the side support arm 2, the side motor 13 being connected to a side reducer 14, and the output shaft of the side reducer 14 being connected to a second drive gear 15. The second drive gear 15 meshes with a driven gear 16, and the driven gear 16 is connected to the end of the main support arm 1. Figure 12 As shown. The first drive structure 3 drives the main support arm 1 to rotate. The axis of rotation of the main support arm 1 is parallel to the ground. The second drive structure 4 is located inside the main support arm 1 and is used to drive the two molds to rotate simultaneously. The axis of rotation of the molds is perpendicular to the ground. The two rotation directions are perpendicular to each other, so that the material in the mold can reach any part of the mold cavity under the action of gravity, thereby achieving a uniform heating effect.

[0054] Two side support arms 2 support the main support arm 1, improving its stability through end-to-end support. The first drive structure 3 drives the main support arm 1 to rotate, with its axis of rotation parallel to the ground. The second drive structure 4 is located inside the main support arm 1 and drives two molds to rotate simultaneously, with their axes of rotation perpendicular to the ground. The two mutually perpendicular structures allow the material in the molds to reach any part of the mold cavity under gravity, thus achieving uniform heating. The side motor 13 drives the output shaft of the side reducer 14 to rotate, which in turn drives the second drive gear 15 to rotate. The rotation of the second drive gear 15 drives the driven gear 16 to rotate. The driven gear 16 is connected to the end of the main support arm 1, and its rotation drives the main support arm 1 to rotate, thereby achieving the overall rotation of the main support arm 1, the tray 5, and the molds.

[0055] In this embodiment, only one first drive structure 3 is provided, that is, only one side support arm 2 is provided with the first drive structure 3. The first drive structure 3 includes a side motor 13 located in the side support arm 2. The side motor 13 is connected to a side reducer 14. The output shaft of the side reducer 14 is connected to a second drive gear 15. The second drive gear 15 meshes with a driven gear 16. The driven gear 16 is connected to the end of the main support arm 1.

[0056] The side motor 13 drives the output shaft of the side reducer 14 to rotate, which in turn drives the second drive gear 15 to rotate. The rotation of the second drive gear 15 drives the driven gear 16 to rotate. The driven gear 16 is connected to the end of the main support arm 1. The rotation of the driven gear 16 drives the main support arm 1 to rotate, thereby realizing the overall rotation of the main support arm 1, the tray 5 and the mold.

[0057] Furthermore, a third slip ring 17 is provided inside the side support arm 2, which is used to supply power to the main support arm 1.

[0058] Furthermore, a fourth slip ring is provided inside the side support arm 2 for supplying power to the side support arm 2.

[0059] Among them, the third slip ring 17 and the fourth slip ring are pneumatic-hydraulic-electric slip rings, used to provide electricity, pneumatic and hydraulic pressure.

[0060] It should be noted that the gas supplied by the gas-hydraulic slip ring can be compressed air, nitrogen, vacuum gas, etc., depending on the actual situation. In addition, the gas-hydraulic slip ring is usually equipped with multiple gas pipes to meet different needs.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 rotating arm mechanism for a rotational molding machine, characterized in that: It includes a main support arm (1), and both sides of the main support arm (1) are provided with trays (5). Each tray (5) is connected to the main support arm (1) through a bearing. Each tray (5) is equipped with a mold. The main support arm (1) is provided with a second drive structure (4) for driving the tray (5) to rotate.

2. The rotary arm mechanism of a rotational molding machine according to claim 1, characterized in that: The main support arm (1) is provided with two slip rings, which are respectively connected to two trays (5).

3. The rotary arm mechanism of a rotational molding machine according to claim 2, characterized in that: The two slip rings are a first slip ring (11) and a second slip ring (12), with the first slip ring (11) sleeved on the outside of the second slip ring (12).

4. A rotational molding machine rotating arm mechanism according to claim 2 or 3, characterized in that: The two slip rings are gas-liquid-electric slip rings.

5. The rotary arm mechanism of a rotational molding machine according to claim 1, characterized in that: The second drive structure (4) includes a main motor (7) located in the main support arm (1). The main motor (7) is connected to a main reducer (8). The two ends of the output shaft of the main reducer (8) extend toward the two trays (5) respectively. Two first drive gears (9) are provided on the output shaft of the main reducer (8). The two trays (5) are provided with a first gear ring (10) that meshes with the first drive gear (9) on the side that is close to each other. The trays (5) are driven to rotate by meshing the first drive gear (9) and the first gear ring (10).

6. The rotary arm mechanism of a rotational molding machine according to claim 1, characterized in that: Each of the trays (5) is provided with a reinforcing frame (6).

7. A rotational molding machine, characterized in that, The rotating arm mechanism of the rotational molding machine as described in any one of claims 1-6 further includes a side support arm (2), wherein the main support arm (1) is rotatably connected to the side support arm (2), and the side support arm (2) is provided with a first drive structure (3) for driving the main support arm (1) to rotate. The first drive structure (3) includes a side motor (13) located inside the side support arm (2), the side motor (13) is connected to a side reducer (14), the output shaft of the side reducer (14) is connected to a second drive gear (15), the second drive gear (15) meshes with a driven gear (16), and the driven gear (16) is connected to the end of the main support arm (1). The side support arm (2) is provided with a third slip ring (17) inside, which is used to supply power to the main support arm (1); the side support arm (2) is provided with a fourth slip ring inside, which is used to supply power to the side support arm (2).

8. A rotational molding machine according to claim 7, characterized in that: The third slip ring (17) and the fourth slip ring are gas-hydraulic-electric slip rings, used for power supply, gas and hydraulic pressure.

Images