Rotational molding equipment for inner wall of water tank

Abstract

The invention discloses water tank inner wall rotational molding equipment, and relates to the technical field of water tank rotational molding, the water tank inner wall rotational molding equipment comprises rails, an outer framework, an inner framework and a rotating shaft I. The rails are symmetrically arranged on the upper side and the lower side of a workpiece, jig rods are arranged on the upper side and the lower side of the workpiece, and driving wheels are in key connection with the outer sides of the jig rods; a horizontal bearing seat box is connected to the outer side of the jig rod, the first rotating shafts are symmetrically arranged on the two sides of the outer framework, a horizontal rotating bearing box is connected to the bottom end of the outer framework, the jig rod is connected into the horizontal rotating bearing box, and a limiting mechanism is arranged on the outer side of the inner framework. According to the novel middle limiting mechanism, the matched lifting structural part serves as a cooperative force transmission medium of the spring and the outer framework, the effective contact area is increased through the design of a boss and an arc-shaped face, radial displacement of the bottom end of the spring is precisely restrained, loads are stably transmitted when the spring stretches out and drastically improves the overall stability of cooperation of the spring and the outer framework.

Description

Technical Field

[0001] This invention relates to the technical field of rotational molding of water tanks, and more specifically to a rotational molding device for the inner wall of a water tank. Background Technology

[0002] Rotational molding is a thermoplastic processing technology that uses a rotating mold to uniformly melt plastic powder, adhere it to the inner wall of the mold cavity, and cool it to form a solid shape. It has advantages such as uniform wall thickness, no weld lines, and the ability to produce complex hollow structures. It is widely used in the manufacture of large hollow products such as water tanks, storage tanks, and amusement facilities. Among them, water tanks are key containers for storing liquids, and the quality of their inner walls directly affects their sealing performance, corrosion resistance, and service life.

[0003] Traditional rotational molding equipment is mostly semi-manual, which has the following problems: the amount of material added depends on experience, which can easily lead to excessive powder, resulting in waste or insufficient material, requiring secondary replenishment and extending the cycle; demolding requires manual prying or the use of simple ejection devices, which can easily cause scratches or deformation to the inner wall of large water tanks weighing several tons; the equipment has a long mold change time, and the mold fixing bolts need to be removed one by one, making it difficult to adapt to the flexible production needs of water tanks of various specifications. Summary of the Invention

[0004] The purpose of this invention is to provide a rotational molding device for the inner wall of a water tank to solve the above-mentioned defects caused by the prior art.

[0005] A rotational molding device for the inner wall of a water tank includes a track, an outer frame, an inner frame, a first rotating shaft, a second rotating shaft, and a drive wheel. The track is symmetrically arranged on the upper and lower sides of the workpiece. Fixture rods are provided on the upper and lower sides of the workpiece. A drive wheel is keyed to the outer side of each fixture rod, and a horizontal bearing housing is connected to the outer side of each fixture rod. The first rotating shaft is symmetrically arranged on both sides of the outer frame. A horizontal rotating bearing housing is connected to the bottom end of the outer frame. A fixture rod is connected inside the horizontal rotating bearing housing. A limit mechanism is provided on the outer side of the inner frame. The limit mechanism... The spring and outer frame are connected by a lifting structure as a force transmission medium. When the spring moves with the sealing cover, the force transmission path remains stable along the axial direction of the feed pipe. A transmission mechanism is provided on the outside of the outer frame. After receiving the external input torque through the active bevel gear, the transmission mechanism turns and transmits the power to the second rotating shaft by meshing with the driven bevel gear at a 90° angle. The second rotating shaft is radially supported by a pair of deep groove ball bearing members. The end of the second rotating shaft drives the driven wheel. The driven wheel and the active wheel form a closed transmission circuit through a transmission chain.

[0006] Preferably, the outer frame, spring, sealing cover, inner frame, workpiece, bottom bracket, top support frame, and cooperating lifting structure constitute a limiting mechanism. The inner frame is penetrated through the inner end of the outer frame, and a jig rod is penetrated through the outer side of the inner frame. A jig rod is connected to the outer side of the jig rod, and a cooperating lifting structure is connected to the outer side of the jig rod. A sealing cover is provided directly below the cooperating lifting structure. The bottom end of the sealing cover is connected to the top end of the workpiece, and the bottom end of the workpiece is connected to the bottom bracket. The outer side of the bottom bracket is connected to the outer side of the bottom bracket, and the bottom bracket is symmetrically arranged on both sides of the inner frame.

[0007] Preferably, the spring is connected to a sealing cap that is axially connected to the feed tube, and the sealing cap is connected to the top of the workpiece.

[0008] Preferably, the spring makes targeted contact with the outer side of the outer frame through a specially designed lifting structure at its bottom end.

[0009] Preferably, the transmission mechanism consists of a driven bevel gear, a driving bevel gear, a second rotating shaft, a load-bearing component, a driven wheel, a driving wheel, and a transmission chain. Its power transmission path is as follows: the driving bevel gear meshes with the driven bevel gear, inputting rotational motion; the driving bevel gear transmits torque to the second rotating shaft at its bottom via a key connection; the second rotating shaft is radially supported by an outer load-bearing component to ensure smooth rotation; the other end of the second rotating shaft is rigidly connected to the driven wheel, driving the driven wheel to rotate synchronously; the driven wheel is connected to the driving wheel via an outer transmission chain; and a coupling is keyed to the outer side of the driving wheel.

[0010] Preferably, the outer side of the outer frame is connected to the load-bearing component through a locating boss and a retaining ring groove, and the inner ring of the load-bearing component is positioned to the outer side of the rotating shaft II through a shoulder and a locking nut.

[0011] Preferably, the driving wheel forms a closed meshing transmission with the outer side of the driven wheel through a transmission chain arranged circumferentially on its outer side.

[0012] Compared with the prior art, the present invention has the following advantages: 1. In this novel limiting mechanism, the lifting structure serves as a coordinating force transmission medium between the spring and the outer frame. The design of the boss and arc-shaped surface increases the effective contact area, precisely constraining the radial displacement of the spring's bottom end. This ensures stable load transmission and suppresses vibration deviation during spring extension and contraction, significantly improving the overall stability of the spring and outer frame. The spring is connected to the top of the workpiece via a sealing cap that doubles as a feed tube and shaft. When the workpiece shifts due to thermal expansion, uneven plastic adhesion, or external disturbances, the spring absorbs energy through compression / tension deformation. This, combined with the lifting structure, pushes the outer frame to fine-tune its position, ensuring the workpiece remains in the center region of the inner and outer frames. This avoids uneven thickness of the rotational molding layer from the source, and its dynamic error compensation capability is significantly superior to traditional rigid fixing structures.

[0013] 2. In this new type of transmission mechanism, the active bevel gear and the driven bevel gear mesh with a 90° staggered axis, achieving efficient torque steering and non-slip transmission to the second rotating shaft, which is suitable for a compact space layout; the second rotating shaft is radially supported by a pair of deep groove ball bearing members, and the outer chain drive design releases internal space, which is convenient for the coaxial arrangement of components such as the transmission chain and sealing cover, and improves the maintainability of the equipment; the overall structure achieves high-precision rotational molding while taking into account space utilization efficiency and long-term reliability through multi-system collaboration. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the engagement between the active bevel gear and the driven bevel pool in this invention; Figure 3 This is a schematic diagram of the transmission mechanism in this invention; Figure 4 This is a schematic diagram of the limiting mechanism in this invention; Figure 5 This is a schematic diagram of the feed pipe in this invention.

[0015] in: 1. Track; 2. Fixture rod; 3. Drive wheel; 4. Horizontal bearing housing; 5. Outer frame; 6. Spring; 7. Sealing cover; 8. Inner frame; 9. Workpiece; 10. Rotating shaft one; 11. Base bracket; 12. Coupling; 13. Horizontal rotating bearing housing; 14. Top support frame; 15. Driven bevel gear; 16. Driven bevel gear; 17. Rotating shaft two; 18. Load-bearing component; 19. Driven wheel; 20. Driven wheel; 21. Transmission chain; 22. Matching lifting structure component; 23. Feed pipe. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0017] like Figures 1 to 5 As shown, a rotational molding device for the inner wall of a water tank includes a track 1, an outer frame 5, an inner frame 8, a first rotating shaft 10, a second rotating shaft 17, and a drive wheel 20. The track 1 is symmetrically arranged on the upper and lower sides of a workpiece 9. Fixture rods 2 are provided on the upper and lower sides of the workpiece 9. A drive wheel 3 is keyed to the outer side of the fixture rod 2, and a horizontal bearing housing 4 is connected to the outer side of the fixture rod 2. The first rotating shaft 10 is symmetrically arranged on both sides of the outer frame 5. A horizontal rotating bearing housing 13 is connected to the bottom end of the outer frame 5. The fixture rod 2 is connected inside the horizontal rotating bearing housing 13. A limit mechanism is provided on the outer side of the inner frame 8. By cooperating with the lifting structure 22 as the force transmission medium between the spring 6 and the outer frame 5, when the spring 6 moves in conjunction with the sealing cover 7, the force transmission path remains stable along the axial direction of the feed pipe 23. A transmission mechanism is provided on the outside of the outer frame 5. After receiving the external input torque through the active bevel gear 16, the transmission mechanism turns and transmits the power to the rotating shaft 17 by meshing with the driven bevel gear 15 at a 90° angle. The rotating shaft 17 is radially supported by a pair of deep groove ball bearing members 18. The end of the rotating shaft 17 drives the driven wheel 19. The driven wheel 19 and the active wheel 20 form a closed transmission circuit through the transmission chain 21.

[0018] In this embodiment, the outer frame 5, spring 6, sealing cover 7, inner frame 8, workpiece 9, bottom bracket 11, top support frame 14, and cooperating lifting structure 22 constitute a limiting mechanism. The inner frame 8 is provided through the inner end of the outer frame 5, and the jig rod 2 is provided through the outer side of the inner frame 8. The jig rod 2 is connected to the outer side of the jig rod 2, and the cooperating lifting structure 22 is connected to the outer side of the jig rod 2. The sealing cover 7 is provided directly below the cooperating lifting structure 22. The bottom end of the sealing cover 7 is connected to the top end of the workpiece 9, and the bottom end of the workpiece 9 is connected to the bottom bracket 11. The outer side of the bottom bracket 11 is connected to the outer side of the bottom bracket 11, and the bottom bracket 11 is symmetrically arranged on both sides of the inner frame 8. The spring 6 is connected to the top end of the workpiece 9 through the sealing cover 7, which is axially connected to the feed pipe 23. The spring 6 forms targeted contact with the outer side of the outer frame 5 through the cooperating lifting structure 22 specially provided at its bottom end.

[0019] In this embodiment, the transmission mechanism consists of a driven bevel gear 15, a driving bevel gear 16, a second rotating shaft 17, a load-bearing member 18, a driven wheel 19, a driving wheel 20, and a transmission chain 21. Its power transmission path is as follows: the driving bevel gear 16 meshes with the driven bevel gear 15, inputting rotational motion. The driving bevel gear 16 transmits torque to the second rotating shaft 17 at its bottom via a key connection. The second rotating shaft 17 is radially supported by the outer load-bearing member 18 to ensure smooth rotation. The other end of the second rotating shaft 17 is connected to… Driven wheel 19 is rigidly connected and driven to rotate synchronously. Driven wheel 19 is connected to driving wheel 20 via transmission chain 21 on its outer side. Driving wheel 20 is keyed to a coupling 12 on its outer side. The outer side of the outer frame 5 is connected to load-bearing member 18 via a positioning boss and a retaining ring groove. The inner ring of load-bearing member 18 is positioned to the outer side of rotating shaft 17 via a shoulder and a locking nut. Driving wheel 20 forms a closed meshing transmission with the outer side of driven wheel 19 via the transmission chain 21 circumferentially arranged on its outer side.

[0020] Among them, the outer frame 5 and the inner frame 8 form a double-layer nested frame. The inner frame 8 runs through the inner side of the outer frame 5, and the jig rod 2 runs through the outer side of the inner frame 8, forming an integrated rigid connection of "outer frame 5-inner frame 8-jig rod 2". The bottom bracket 11 symmetrically supports the bottom of the workpiece 9, and the top support frame 14 constrains the top of the workpiece 9, restricting the axial movement of the workpiece 9 in all directions, avoiding deformation caused by thermal expansion or stress, and significantly improving the load-bearing reliability.

[0021] In practical applications, the rotational molding equipment for the inner wall of this type of water tank includes the following tasks: Track 1 is symmetrically arranged on the upper and lower sides of workpiece 9. The upper and lower ends of workpiece 9 are connected to track 1 through fixture rod 2. The outer side of fixture rod 2 is keyed to drive wheel 3. Drive wheel 3 rolls along track 1, limiting the lateral displacement of workpiece 9. At the same time, the outer side of fixture rod 2 is connected to horizontal bearing housing 4, which provides low-friction rotation support for fixture rod 2, ensuring that workpiece 9 can move or rotate smoothly along track 1. The rolling unit is transported to the designated position through the upper and lower layers of track 2 (or only the lower layer track when it is a small workpiece). Then, the drive wheel 3 is driven to rotate by external drive, so that the equipment can rotate 720° in both axes, thereby causing the workpiece to roll. At the same time, drive wheel 3 rotates on its own through friction or gear engagement on other mechanisms, or is driven by external power to rotate drive wheel 3 of this unit, so that the equipment can rotate 720° in both axes, thereby causing the workpiece to roll. The outer frame 5 and the inner frame 8 form a double-layer nested frame. The inner frame 8 is penetrated through the inner side of the outer frame 5, and the jig rod 2 is penetrated through the outer side of the inner frame 8, forming a rigid connection between the outer frame 5, the inner frame 8 and the jig rod 2. The bottom bracket 11 is symmetrically arranged on both sides of the inner frame 8 to support the bottom of the workpiece 9. The top support frame 14 is connected to the top of the workpiece 9 and together with the outer frame 5, it constrains the axial position of the workpiece 9 to avoid axial movement caused by thermal expansion or stress. The end of the rotating shaft 17 is rigidly connected to the driven wheel 19, driving the driven wheel 19 to rotate synchronously. The driven wheel 19 and the driving wheel 20 form a closed meshing transmission through the outer transmission chain 21. The transmission chain 21 is circumferentially located on the outer side of the driving wheel 20, precisely meshing with the outer tooth groove of the driven wheel 19. The outer side of the driving wheel 20 is keyed to the coupling 12, ultimately transmitting power to the fixture rod 2 and the drive wheel 3, driving the workpiece 9 to rotate around its own axis. The rotational speed is controlled by the transmission ratio. Spring 6 is connected to the top of workpiece 9 via sealing cover 7, which also serves as a shaft, through feed pipe 23. Sealing cover 7 is fixed to the top of workpiece 9. Feed pipe 23 connects to sealing cover 7 as a shaft, and the force transmission remains stable along the axial direction of feed pipe 23. The operator injects material into the interior of workpiece 9 through feed pipe 23. The bottom of spring 6 is connected to the outside of outer frame 5 through lifting structure 22. Lifting structure 22 serves as a force transmission mechanism between spring 6 and outer frame 5. When workpiece 9 rotates, the inner wall is evenly exposed to molten plastic. Under the action of centrifugal force and gravity, plastic is evenly attached to the inner wall. After cooling and solidification by heating system, a water tank inner wall of uniform thickness is formed.

[0022] Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not exhaustive. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A rotational molding equipment for the inner wall of a water tank, characterized in that: The system includes a track (1), an outer frame (5), an inner frame (8), a first rotating shaft (10), a second rotating shaft (17), and a drive wheel (20). The track (1) is symmetrically arranged on the upper and lower sides of the workpiece (9). A jig rod (2) is provided on the upper and lower sides of the workpiece (9). A drive wheel (3) is keyed to the outer side of the jig rod (2). A horizontal bearing housing (4) is connected to the outer side of the jig rod (2). The first rotating shaft (10) is symmetrically arranged on both sides of the outer frame (5). A horizontal rotating bearing housing (13) is connected to the bottom end of the outer frame (5). The jig rod (2) is connected inside the horizontal rotating bearing housing (13). A limit mechanism is provided on the outer side of the inner frame (8). The limit mechanism is used in conjunction with... The lifting structure (22) serves as a coordinating force transmission medium between the spring (6) and the outer frame (5). When the spring (6) moves in conjunction with the sealing cover (7), the force transmission path remains stable along the axial direction of the feed pipe (23). A transmission mechanism is provided on the outer side of the outer frame (5). After receiving the external input torque through the active bevel gear (16), the transmission mechanism turns the power and transmits it to the rotating shaft (17) by meshing with the driven bevel gear (15) at a 90° angle. The rotating shaft (17) is radially supported by a pair of deep groove ball bearing members (18). The end of the rotating shaft (17) drives the driven wheel (19). The driven wheel (19) and the active wheel (20) form a closed transmission circuit through the transmission chain (21).

2. The rotational molding equipment for the inner wall of a water tank according to claim 1, characterized in that: The outer frame (5), spring (6), sealing cover (7), inner frame (8), workpiece (9), bottom bracket (11), top support frame (14) and cooperating lifting structure (22) constitute a limiting mechanism. The inner frame (8) is provided through the inner end of the outer frame (5). The jig rod (2) is provided through the outer side of the inner frame (8). The jig rod (2) is connected to the outer side of the jig rod (2). The cooperating lifting structure (22) is connected to the outer side of the jig rod (2). The sealing cover (7) is provided directly below the cooperating lifting structure (22). The bottom end of the sealing cover (7) is connected to the top end of the workpiece (9). The bottom end of the workpiece (9) is connected to the bottom bracket (11). The outer side of the bottom bracket (11) is connected to the outer side of the bottom bracket (11). The bottom bracket (11) is symmetrically arranged on both sides of the inner frame (8).

3. The rotational molding equipment for the inner wall of a water tank according to claim 2, characterized in that: The spring (6) is connected to the top of the workpiece (9) via a sealing cap (7) that is axially connected to the feed tube (23).

4. The rotational molding equipment for the inner wall of a water tank according to claim 3, characterized in that: The spring (6) makes targeted contact with the outer side of the outer frame (5) through a specially designed lifting structure (22) at its bottom end.

5. The rotational molding equipment for the inner wall of a water tank according to claim 1, characterized in that: The transmission mechanism consists of a driven bevel gear (15), a driving bevel gear (16), a second rotating shaft (17), a load-bearing member (18), a driven wheel (19), a driving wheel (20), and a transmission chain (21). Its power transmission path is as follows: the driving bevel gear (16) meshes with the driven bevel gear (15) to input rotational motion. The driving bevel gear (16) transmits torque to the second rotating shaft (17) at its bottom end through a key connection. The second rotating shaft (17) is provided with radial support by the load-bearing member (18) on the outside to ensure its smooth rotation. The other end of the second rotating shaft (17) is rigidly connected to the driven wheel (19) to drive the driven wheel (19) to rotate synchronously. The driven wheel (19) is connected to the driving wheel (20) through the transmission chain (21) on the outside to achieve chain drive connection. The outer side of the driving wheel (20) is keyed with a coupling (12).

6. The rotational molding equipment for the inner wall of a water tank according to claim 5, characterized in that: The outer side of the outer frame (5) is connected to the load-bearing member (18) through the matching structure of the positioning boss and the snap ring groove. The inner ring of the load-bearing member (18) and the outer side of the rotating shaft (17) are positioned by the shaft shoulder and the locking nut.

7. The rotational molding equipment for the inner wall of a water tank according to claim 5, characterized in that: The driving wheel (20) forms a closed meshing transmission with the outer side of the driven wheel (19) through the transmission chain (21) arranged circumferentially on its outer side.

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