A rotational molding machine

Abstract

The present invention discloses a roto-molding machine, which belongs to the technical field of roto-molding, and comprises a main support arm and a side support arm for supporting the main support arm, wherein the side support arm is provided with a first driving mechanism for driving the main support arm to rotate, and the upper and lower surfaces of the main support arm are respectively provided with mold trays, and the main support arm is provided with a second driving mechanism for driving the mold tray to rotate, and each mold tray is connected to the main support arm through a slewing bearing, and the main support arm is provided with two gas-liquid electric slip rings, and the two gas-liquid electric slip rings are respectively connected to two mold trays. The present invention solves the problem that the existing equipment can only carry molds on one side, and can realize two bearing plates, that is, double-sided carrying of molds, which greatly improves the production efficiency of the equipment; solves the problem that the existing two electric slip rings are large in size and occupy a large space, and at the same time solves the problem that the horizontal rotating arm frame is large and the manufacturing and operating costs are high.

Description

Technical Field

[0001] The invention relates to the technical field of rotational molding, in particular to a rotational molding machine. Background Art

[0002] Roto-molding, also known as rotational molding, rotational molding, rotational molding, etc., is a method of hollow molding of roto-plastic plastics. The method is to first add the plastic raw material into the mold, and then the mold is continuously rotated along two vertical axes and heated. Under the action of gravity and heat energy, the plastic raw material in the mold is gradually and evenly coated, melted and adhered to the entire surface of the mold cavity, forming into the required shape, and then cooled and shaped into a product.

[0003] The current rotational molding machines usually support the mold with an L-shaped support arm + straight arm to achieve the rotation of the mold in two different directions. The motor and other equipment that drive the mold to rotate need to be installed under the L-shaped support arm. The mold itself and the driving equipment are both heavy structures, so the L-shaped support arm can only bear the weight of one side of the mold and the driving structure, and the processing efficiency of the single-sided mold is low. In addition, when the above structure rotates, since the mold, material and support arm are away from the rotation axis of the L-shaped support arm as a whole, a large momentum will be generated, and the power required to drive the rotation is also relatively large.

[0004] In order to overcome the shortcomings of the L-shaped support arm, there is already a roto-molding machine with a rotatable mold tray structure on the horizontal rotating arm. In order to improve processing efficiency and balance considerations, designers will consider setting up a double-sided mold. In terms of realizing the roto-molding function, the smaller the distance between the upper and lower molds, the better. However, when setting up a double-sided mold, the heating and power supply of the mold must be considered. For the power supply of the rotating mold, a conductive slip ring must be used. Since the electricity is used for mold heating, the selected conductive slip ring has high power and large volume. How to reduce the space occupied by the two conductive slip rings in the up and down directions is the key factor in shortening the distance between the upper and lower molds. Generally, an electric slip ring is used to power the mold separately, that is, for a double-sided mold, two electric slip rings are set up and down to power the two molds respectively. When this method is used, the two electric slip rings are large in volume and occupy a large space, which also leads to a large horizontal rotating arm frame and increased manufacturing and operating costs. Summary of the invention

[0005] The invention aims at solving the deficiencies in the prior art and provides a rotational molding machine.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A rotational molding machine comprises a main support arm and a side support arm for supporting the main support arm, the side support arm is provided with a first driving mechanism for driving the main support arm to rotate, the upper and lower surfaces of the main support arm are respectively provided with mold trays, the main support arm is provided with a second driving mechanism for driving the mold tray to rotate, each of the mold trays is connected to the main support arm through a slewing bearing, the main support arm is provided with two gas-liquid electric slip rings, and the two gas-liquid electric slip rings are respectively connected to two mold trays.

[0008] The technical effect of adopting the above technical solution is: the side support arm supports the main support arm, the first drive mechanism in the side support arm drives the main support arm to flip (the rotation axis of the main support arm is parallel to the ground), and the second drive mechanism drives the two mold trays to rotate (the rotation axis of the mold tray is perpendicular to the ground). Through the rotation in two different directions, it is convenient for the rotational molding machine to rotate the product, which solves the problem that the existing equipment can only carry the mold on one side, and can realize two carrying plates, that is, double-sided mold carrying, which greatly improves the production efficiency of the equipment; the two mold trays are respectively placed on the upper and lower surfaces of the main support arm, and the rotor wire of each gas-liquid electric slip ring is connected to the corresponding mold tray, and the second drive The mechanism drives the two mold trays to rotate synchronously. Compared with the prior art in which one gas-liquid electric slip ring corresponds to one mold tray and the two gas-liquid electric slip rings are arranged up and down, the space occupied by the two gas-liquid electric slip rings in the present solution is greatly shortened, and the distance between the two corresponding mold trays is shortened, and the stability of the mold trays during rotation is improved accordingly. At the same time, the occupied space (height) of the entire rotational molding machine is reduced, and the cost is reduced; compared with the existing rotational molding machine, the length of the conductive slip ring, that is, the slip ring of the set design can be shortened by half compared with the slip ring of the back-to-back design, that is, the thickness of the main support arm is also greatly shortened, saving the manufacturing and operation costs.

[0009] Furthermore, the two gas-liquid electric slip rings are respectively a first gas-liquid electric slip ring and a second gas-liquid electric slip ring, and the first gas-liquid electric slip ring is sleeved on the outside of the second gas-liquid electric slip ring.

[0010] Furthermore, the second gas-liquid electric slip ring is provided with a first connecting plate and a second connecting plate, the first connecting plate is fixed to the external stator of the second gas-liquid electric slip ring and the internal stator of the first gas-liquid electric slip ring, and the two ends of the first connecting plate are respectively connected to the inner ring of the slewing bearing; the second connecting plate is connected to the internal rotor of the second gas-liquid electric slip ring, and the two ends thereof are connected to the outer ring of the slewing bearing; the first gas-liquid electric slip ring is provided with a third connecting plate, and the third connecting plate is connected to the outer ring of the slewing bearing, so that the outer ring of the slewing bearing can drive the rotor of the first gas-liquid electric slip ring to rotate synchronously when rotating.

[0011] The technical effect of adopting the above technical solution is as follows: the second gas-liquid electric slip ring is fixedly provided with a first connecting plate and a second connecting plate. After the first connecting plate is fixed to the outer shell of the second gas-liquid electric slip ring, its two ends are connected to the inner ring of the slewing bearing, and the inner ring of the slewing bearing does not rotate. The outer shell of the second gas-liquid electric slip ring is fixed by the first connecting plate, that is, the outer shell (stator) of the second gas-liquid electric slip ring is fixed to be non-rotating; the second connecting plate is connected to the inner rotor of the second gas-liquid electric slip ring, and its two ends are connected to the outer ring of the slewing bearing, and the outer ring of the slewing bearing rotates, so when the slewing bearing rotates, it can drive the inner rotor of the second gas-liquid electric slip ring to rotate synchronously, and the slewing bearing is connected to the second driving mechanism, and the second driving mechanism drives the mold tray to rotate synchronously, that is, the rotation of the mold tray and the rotation of the inner rotor of the second gas-liquid electric slip ring are synchronous, and there will be no wire breakage; similarly, the first gas-liquid electric slip ring is also provided with a third connecting plate, which is consistent with the rotation principle of the second gas-liquid electric slip ring. The outer ring of the first gas-liquid electric slip ring is a rotor, and the inside is a stator. When the first connecting plate is connected to the stator of the second gas-liquid electric slip ring, the stator of the first gas-liquid electric slip ring is also fixed. The third connecting plate is fixed to the first gas-liquid electric slip ring, and the third connecting plate is connected to the outer ring of the slewing bearing, so that the outer ring of the slewing bearing can synchronously drive the rotor of the first gas-liquid electric slip ring to rotate when it rotates.

[0012] Furthermore, the two gas-liquid electric slip rings are respectively a first gas-liquid electric slip ring and a second gas-liquid electric slip ring, and the stator of the first gas-liquid electric slip ring and the stator of the second gas-liquid electric slip ring are integrated.

[0013] The technical effect of adopting the above technical solution is: the interior of the first gas-liquid electric slip ring is a stator, the exterior of the second gas-liquid electric slip ring is a stator, and when the first gas-liquid electric slip ring is sleeved on the second gas-liquid electric slip ring, the stators of the two slip rings are set as one, which further shortens the space occupied by the two gas-liquid electric slip rings after being sleeved.

[0014] Furthermore, the second driving mechanism includes a main motor arranged in the main support arm, the main motor is connected to a main reducer, both ends of the output shaft of the main reducer extend to the two mold trays respectively, and two first driving gears are arranged on the output shaft of the main reducer, and an outer gear ring is arranged on the slewing support bearing, and the two first driving gears are respectively meshed with the outer gear rings of the corresponding slewing support bearing.

[0015] The technical effect of adopting the above technical solution is: after the main motor is started, the output shaft of the main reducer rotates to drive the two first driving gears to rotate. When the two first driving gears rotate, they engage with the outer gear ring of the slewing bearing, drive the outer ring of the slewing bearing to rotate, and then synchronously drive the mold tray to rotate.

[0016] Furthermore, a mounting plate is provided on one side of each slewing bearing close to the mold tray, and two sides of the mounting plate are respectively connected to the mold tray and the outer ring of the slewing bearing.

[0017] The technical effect of adopting the above technical solution is: by providing a mounting plate, the side of the mold tray where the mold is not mounted can be protected, and at the same time the strength of the mold tray can be improved.

[0018] Furthermore, the first driving mechanism includes a side motor located in the side support arm, the side motor is connected to a side reducer, the output shaft of the side reducer is connected to a second driving gear, the second driving gear is meshed with a driven gear, and the driven gear is connected to the end of the main support arm.

[0019] Furthermore, a third gas-liquid electric slip ring is arranged inside the side support arm, and the third gas-liquid electric slip ring is used to supply electricity, gas and hydraulic pressure to the main support arm.

[0020] Furthermore, it also includes a heat dissipation device, and a heat dissipation device is also provided, and the heat dissipation device is a fan.

[0021] The technical effect of adopting the above technical solution is: after the rotational molding is completed, the whole equipment can be cooled by turning on the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure;

[0023] Figure 2 It is a schematic diagram of the structure when the mold is clamped to the mold tray;

[0024] Figure 3 To highlight the structural diagram of the main support arm and the mounting plate;

[0025] Figure 4 is a partial schematic diagram of a first driving mechanism;

[0026] Figure 5 It is a structural schematic diagram of the mold tray and the supporting frame;

[0027] Figure 6 A schematic diagram of the structure of the main support arm and the second driving mechanism;

[0028] Figure 7 for Figure 6 The enlarged schematic diagram of part A in the middle;

[0029] Figure 8 A cross-sectional view to highlight the slewing bearing and the first driving gear;

[0030] Fig. 9 A schematic diagram to highlight the structure of the first connecting plate and the second connecting plate;

[0031] Fig.10 To highlight the structural diagram of the third connecting plate and the first gas-liquid-electric slip ring;

[0032] Fig.11 It is a schematic diagram of the structure when the first gas-liquid electric slip ring and the second gas-liquid electric slip ring are sleeved;

[0033] Fig.12 A cross-sectional view to highlight the first gas-liquid electric slip ring and the second gas-liquid electric slip ring;

[0034] Fig.13 The figure is a schematic diagram of a structure in which a first gas-liquid electric slip ring and a second gas-liquid electric slip ring stator are integrated.

[0035] Explanation of the reference numerals: 1. main support arm; 2. side support arm; 3. fan; 4. mold tray; 5. second drive mechanism; 6. main motor; 7. first driving gear; 8. slewing bearing; 9. mounting plate; 10. main reducer; 11. first gas-liquid electric slip ring; 12. second gas-liquid electric slip ring; 13. first connecting plate; 14. second connecting plate; 15. third connecting plate; 16. third gas-liquid electric slip ring; 17. side motor; 18. second driving gear; 19. driven gear; 20. side reducer; 21. support frame; 23. first drive mechanism; 24. outer gear ring; 25. first rotor; 26. second rotor. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with all the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] The embodiment of the invention discloses a rotational molding machine.

[0038] Example 1

[0039] Reference Figure 1-Figure 12 A rotomolding machine comprises a main support arm 1 and side support arms 2 located on both sides of the main support arm 1, the main support arm 1 is rotatably connected to the side support arms 2, both ends of the main support arm 1 are mounted on the side support arms 2 of the rotomolding machine through bearings, the main support arm 1 is a straight arm, and the side support arm 2 is provided with a first driving mechanism 23 for driving the main support arm 1 to rotate. Mold trays 4 are provided on both sides (upper and lower sides) of the main support arm 1, and molds are installed on each mold tray 4, so that two molds on a set of equipment can work simultaneously, which greatly improves the efficiency compared with the single processing of a single mold in the prior art.

[0040] The main support arm 1 is hollow inside, and is provided with a second drive mechanism 5 for driving the mold to rotate. In this embodiment, the mold is fixedly mounted on the mold tray 4, that is, the mold tray 4 rotates synchronously with the mold. It can be understood that the second drive mechanism 5 actually drives the mold tray 4 to rotate, and the mold rotates synchronously through the rotation of the mold tray 4. The second drive mechanism 5 is arranged inside the main support arm 1 and does not occupy additional space. The main support arm 1 is provided with two gas-liquid electric slip rings, which are respectively connected to the two mold trays 4 to provide gas, liquid and electricity.

[0041] Furthermore, the two gas-liquid slip rings are respectively a first gas-liquid slip ring 11 and a second gas-liquid slip ring 12, and the first gas-liquid slip ring 11 is sleeved on the outside of the second gas-liquid slip ring 12. Fig.12 As shown. The first gas-liquid electric slip ring 11 and the second gas-liquid electric slip ring 12 are set in a sleeve manner to provide power, gas (compressed air or nitrogen, etc., determined according to needs) and liquid (hydraulic pressure) to the two molds, and the sleeve arrangement can shorten the distance between the two mold trays 4. As the distance between the two mold trays 4 is shortened, the height of the corresponding two side support arms 2 is also shortened, thereby shortening the overall height of the equipment and saving the space occupied by the equipment. The present invention reduces the height of the main support arm 1, thereby reducing space waste, reducing operating and manufacturing costs, and adopting a new conductive slip ring structure and a horizontal drive mechanism to reduce installation space, improve operating balance, and reduce energy consumption and manufacturing costs.

[0042] It should be noted that, in this embodiment, Figure 9-11As shown, the first gas-liquid electric slip ring 11 and the second gas-liquid electric slip ring 12 are sleeved and connected. The second gas-liquid electric slip ring 12 is fixed with a first connecting plate 13 and a second connecting plate 14. The two connecting plates are rectangular. After the first connecting plate 13 is fixed to the outer shell of the second gas-liquid electric slip ring 12, its two ends are connected to the inner ring of the slewing bearing 8. The inner ring of the slewing bearing 8 does not rotate. The outer shell of the second gas-liquid electric slip ring 12 is fixed by the first connecting plate 13, that is, the outer shell of the second gas-liquid electric slip ring 12 is fixed. The housing (stator) is non-rotating; the second connecting plate 14 is connected to the internal rotor of the second gas-liquid electric slip ring 12, and its two ends are connected to the outer ring of the slewing bearing 8, while the outer ring of the slewing bearing 8 is rotating. The outer ring gear 24 is provided on the outside of the slewing bearing 8, so when the outer ring gear 24 rotates, it can drive the internal rotor of the second gas-liquid electric slip ring 12 to rotate; similarly, the first gas-liquid electric slip ring 11 is also provided with a third connecting plate 15, which is consistent with the rotation principle of the second gas-liquid electric slip ring 12. The outer ring of the first gas-liquid electric slip ring 11 is a rotor, and the inside is a stator. When the first connecting plate 13 is connected to the stator of the second gas-liquid electric slip ring 12, it also fixes the stator of the first gas-liquid electric slip ring 11, and the third connecting plate 15 is fixed to the first gas-liquid electric slip ring 11, and the third connecting plate 15 is connected to the outer ring of the slewing bearing 8, so that the outer ring of the slewing bearing 8 can synchronously drive the first gas-liquid electric slip ring 11 to rotate when rotating.

[0043] A mounting plate 9 is provided on one side of each slewing bearing 8 close to the mold tray 4, and the two sides of the mounting plate 9 are respectively connected to the mold tray 4 and the outer ring of the slewing bearing 8. By providing the mounting plate 9, the side of the mold tray 4 where the mold is not installed can be protected, and the strength of the mold tray 4 can be improved.

[0044] It should be emphasized that the wiring method inside the gas-liquid electric slip ring adopts the wiring method in the prior art in this embodiment to ensure that the wire will not be broken during the rotation process. The wiring method of the gas-liquid electric slip ring is not described in detail in this embodiment, and in the provided drawings, only a simple diagram of two gas-liquid electric slip rings are shown for the gas-liquid electric slip ring, and the complex internal structure of the gas-liquid electric slip ring is not shown.

[0045] It is necessary to further emphasize that: taking two gas-liquid slip rings as an example, Fig.12As shown, the first gas-liquid slip ring 11 includes a first rotor 25 and a first stator. The first stator is sleeved on the outside of the first rotor 25 through a bearing. A conductive ring is arranged between the first stator and the first rotor 25. The wire enters from the first stator and is electrically connected to the first stator, then exits from the first rotor 25 and is electrically connected to the wire of the mold. The power supply to the mold is realized by the rotation of the first rotor 25 and the friction of the guide ring. The second gas-liquid slip ring 12 includes a second rotor 26 and a second stator. The second rotor 26 is connected to the outside of the second stator through a bearing. The internal structure and the way of entering and exiting the wire are the same as those of the first gas-liquid slip ring 11. The wire enters from the second stator, then exits from the second rotor 26 and is electrically connected to another mold. The first gas-liquid electric slip ring 11 and the second gas-liquid electric slip ring 12 can be fixed in a sleeved manner by connecting the second stator to the outside of the first stator through a fixing structure, such as a fixing plate, or the two gas-liquid electric slip rings can be simply sleeved and then the stators of the two gas-liquid electric slip rings can be connected to the bearings through the fixing structure, thereby achieving the purpose of fixing the stator parts of the two gas-liquid electric slip rings.

[0046] Reference Figure 6-Figure 8 , the second driving mechanism 5 includes a main motor 6 arranged in the main support arm 1, the main motor 6 is connected to a main reducer 10, the two ends of the output shaft of the main reducer 10 extend to the two mold trays 4 respectively, and two first driving gears 7 are arranged on the output shaft of the main reducer 10, and the outer rings of the two slewing bearings 8 are both provided with outer gear rings 24 meshing with the first driving gears 7, and the mold tray 4 is connected to the outer ring of the slewing bearing 8, so the mold tray 4 can be driven to rotate by the meshing of the first driving gear 7 and the outer gear ring 24. The outer gear ring 24 is a circular ring structure, which can avoid space so as to facilitate the installation of the first gas-liquid electric slip ring 11 and the second gas-liquid electric slip ring 12 inside. The main motor 6 starts to drive the output shaft of the main reducer 10 to rotate, driving the two first driving gears 7 to rotate, the rotation of the first driving gear 7 drives the outer gear ring 24 to rotate, and the rotation of the outer gear ring 24 drives the mold tray 4 to rotate synchronously, thereby driving the mold to rotate.

[0047] It should be noted that, in this embodiment, a main reducer 10 is used to drive the two first driving gears 7 to rotate, so that the two outer gear rings 24 are respectively engaged with the corresponding first driving gears 7, so that the two mold trays 4 rotate synchronously, ensuring the synchronization of the two mold trays 4 and the two molds during rotation.

[0048] In order to improve the overall strength of the mold tray 4, a support frame 21 is installed on the side of each mold tray 4 away from the mold. The support frame 21 is assembled by a plurality of reinforcing tubes, and the shape of the support frame 21 is similar or the same as that of the mold tray 4, such as Figure 5As shown, the support frame 21 is a hollow square tube. In addition to improving the overall strength, structures such as wires will also be led out of the hollow square tube.

[0049] The first driving mechanism 23 includes a side motor 17 located in the side support arm 2, the side motor 17 is connected to a side reducer 20, the output shaft of the side reducer 20 is connected to a second driving gear 18, the second driving gear 18 is meshed with a driven gear 19, and the driven gear 19 is connected to the end of the main support arm 1. Figure 6 The first driving mechanism 23 drives the main support arm 1 to rotate, and the rotation axis of the main support arm 1 is parallel to the ground, while the second driving mechanism 5 is located in the main support arm 1, and is used to drive the two molds to rotate simultaneously, and the rotation axis 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.

[0050] The two side support arms 2 support the main support arm 1, and the stability of the main support arm 1 is improved by supporting both ends. The first driving mechanism 23 drives the main support arm 1 to rotate, and the rotating shaft of the main support arm 1 is parallel to the ground, and the second driving mechanism 5 is located in the main support arm 1, which is used to drive the two molds to rotate at the same time. The rotating shaft of the mold is perpendicular to the ground. The two mutually perpendicular ones enable the material in the mold to reach any part of the mold cavity under the action of gravity, thereby achieving a uniform heating effect; the side motor 17 drives the output shaft of the side reducer 20 to rotate, driving the second driving gear 18 to rotate, and the rotation of the second driving gear 18 drives the driven gear 19 to rotate. The driven gear 19 is connected to the end of the main support arm 1, and the main support arm 1 is driven to rotate by the rotation of the driven gear 19, thereby realizing the overall rotation of the main support arm 1, the mold tray 4 and the mold.

[0051] In this embodiment, the first driving mechanism 23 is provided only one, that is, the first driving mechanism 23 is provided in only one side support arm 2. The first driving mechanism 23 comprises a side motor 17 located in the side support arm 2, the side motor 17 is connected to a side reducer 20, the output shaft of the side reducer 20 is connected to a second driving gear 18, the second driving gear 18 is meshed with a driven gear 19, and the driven gear 19 is connected to the end of the main support arm 1.

[0052] The side motor 17 drives the output shaft of the side reducer 20 to rotate, which drives the second driving gear 18 to rotate. The rotation of the second driving gear 18 drives the driven gear 19 to rotate. The driven gear 19 is connected to the end of the main support arm 1. The rotation of the driven gear 19 drives the main support arm 1 to rotate, thereby realizing the overall rotation of the main support arm 1, the mold tray 4 and the mold.

[0053] Furthermore, a third gas-liquid electric slip ring 16 is provided inside the side support arm 2 , and the third gas-liquid electric slip ring 16 is used to supply electricity, gas and hydraulic pressure to the main support arm 1 .

[0054] Furthermore, a gas-liquid-electric slip ring is provided inside the side support arm 2 for providing gas, hydraulic pressure and electricity to the side support arm 2 .

[0055] Furthermore, the rotational molding machine also includes a heat dissipation device, which is a fan 3. After the rotational molding is completed, the fan 3 is turned on to cool the entire device.

[0056] Example 2

[0057] The main difference between Example 2 and Example 1 is the arrangement of the two gas-liquid electrical slip rings, such as Fig.13 As shown, the stators of the two gas-liquid slip rings are designed as one body, that is, the stator parts of the first gas-liquid slip ring 11 and the second gas-liquid slip ring 12 are designed as one body. In this embodiment, the first gas-liquid slip ring 11 includes a stator and a first rotor 25, and the second gas-liquid slip ring 12 includes a second rotor 26, and the stator part of the second gas-liquid slip ring 12 is shared with the stator part of the first gas-liquid slip ring 11, that is, the stator parts of the first gas-liquid slip ring 11 and the second gas-liquid slip ring 12 in this embodiment are designed as one body, and a conductive structure such as a conductive ring is provided between the stator and the rotor. On this basis, the second rotor 26 is connected to the upper end of the stator through a bearing, and the wire enters from the stator, is led out from the second rotor 26, and is electrically connected to the upper mold; the first rotor 25 is connected to the lower outside of the stator through a bearing, and the wire is led out from the first rotor 25 and is electrically connected to the lower mold.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotational molding machine, comprising a main support arm (1) and a side support arm (2) for supporting the main support arm (1), characterized in that: The main support arm (1) is a straight arm, and the interior of the main support arm (1) is hollow. The side support arm (2) is provided with a first driving mechanism (23) for driving the main support arm (1) to rotate. The upper and lower surfaces of the main support arm (1) are respectively provided with mold trays (4). The mold tray (4) is connected to the main support arm (1) through a slewing bearing (8). The main support arm (1) is provided with a second driving mechanism (5) for driving the mold tray (4) to rotate. Each mold tray (4) is connected to the main support arm (1) through a slewing bearing (8). The main support arm (1) is provided with two gas-liquid electric slip rings, and the two gas-liquid electric slip rings are respectively connected to the two mold trays (4). The two gas-liquid electric slip rings are respectively a first gas-liquid electric slip ring (11) and a second gas-liquid electric slip ring (12). The first gas-liquid electric slip ring (11) is sleeved on the outside of the second gas-liquid electric slip ring (12). The second gas-liquid electric slip ring (12) is provided with a first connecting plate (13) and a second connecting plate (14); the first connecting plate (13) is fixed to an external stator of the second gas-liquid electric slip ring (12) and an internal stator of the first gas-liquid electric slip ring (11); two ends of the first connecting plate (13) are connected to the inner ring of the slewing bearing (8); the second connecting plate (14) is connected to the internal rotor of the second gas-liquid electric slip ring (12), and two ends of the second connecting plate (14) are connected to the outer ring of the slewing bearing (8); the first gas-liquid electric slip ring (11) is provided with a third connecting plate (15), and the third connecting plate (15) is connected to the outer ring of the slewing bearing (8), so that the outer ring of the slewing bearing (8) can drive the rotor of the first gas-liquid electric slip ring (11) to rotate synchronously when the outer ring of the slewing bearing (8) rotates.

2. A rotomolding machine according to claim 1, characterized in that: The second driving mechanism (5) comprises a main motor (6) arranged in the main support arm (1), the main motor (6) is connected to a main reducer (10), the two ends of the output shaft of the main reducer (10) respectively extend to the two mold trays (4), and two first driving gears (7) are arranged on the output shaft of the main reducer (10), the slewing bearing (8) is provided with an outer gear ring (24), and the two first driving gears (7) are respectively meshed with the corresponding outer gear rings (24).

3. A rotational molding machine according to any one of claims 1 or 2, characterized in that: A mounting plate (9) is provided on one side of each slewing bearing (8) close to the mold tray (4), and two sides of the mounting plate (9) are respectively connected to the mold tray (4) and the outer ring of the slewing bearing (8).

4. A rotomolding machine according to claim 1, characterized in that: The first driving mechanism (23) comprises a side motor (17) located in the side support arm (2), the side motor (17) is connected to a side reducer (20), the output shaft of the side reducer (20) is connected to a second driving gear (18), the second driving gear (18) is meshed with a driven gear (19), and the driven gear (19) is connected to the end of the main support arm (1).

5. A rotomolding machine according to claim 4, characterized in that: A third gas-liquid electric slip ring (16) is arranged inside the side support arm (2), and the third gas-liquid electric slip ring (16) is used to supply electricity, gas and hydraulic pressure to the main support arm (1).

6. A rotomolding machine according to claim 1, characterized in that: It also comprises a heat dissipation device, which is a fan (3).

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