Sealing structure of hot melt adhesive stirring tank
By setting a triple sealing structure at the transmission device of the mixing tank, the problem of poor sealing of traditional mixing tanks is solved, the vacuum degree requirement and mixing efficiency are improved, and the service life of the mixing motor is extended.
Patent Information
- Application Number
- CN202522649461.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-15
AI Technical Summary
Traditional mixing tanks have poor sealing devices that cannot meet vacuum requirements during vacuuming, and the lifespan of the mixing motor is severely affected by vibrations caused by unbalanced forces, making it difficult to evenly mix viscous ointments.
A triple sealing structure is installed at the transmission device of the mixing tank, including a stationary ring, a rotating ring, and an elastic element, located at the agitator shaft, the rotation shaft, and the revolution shaft, respectively. The triple sealing structure prevents gas from entering or leaving, ensuring the sealing performance of the mixing tank.
It achieves the required vacuum level during vacuuming, reduces vibration of the stirring motor, improves stirring efficiency and motor life, and can evenly stir viscous ointments.
Smart Images
Figure CN224926024U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mixing tank technology, specifically to a sealing structure for a hot melt adhesive mixing tank. Background Technology
[0002] A hot melt adhesive mixing tank is a device used to heat and mix gel-like substances. It is applied in fields such as plaster patch manufacturing to mix the ointments required for plaster patches. Traditional ointment mixing devices are typically single-shaft mixing structures. To increase the mixing intensity of the single-shaft mixing rod, multiple mixing teeth or branch mixing rods can be added to the single-shaft mixing rod. This mixing structure cannot agitate highly viscous ointments such as gel ointments, honey ointments, and rubber ointments. Furthermore, the torque borne by the mixing paddle shaft and the unbalanced force due to the single mixing paddle shaft cause significant vibration of the entire machine, severely affecting the service life of the mixing motor. It also requires an extremely long time to evenly mix highly viscous ointments, which is not only time-consuming but also affects the efficacy of the medicine. Therefore, a dual-shaft mixing tank has been developed.
[0003] Due to process requirements, the mixing tank needs to be evacuated during the mixing of the ointment to maintain a certain degree of vacuum. Existing mixing tanks only have a general sealing device at the bearing to prevent leakage of lubricating medium and intrusion of external contaminants. Although this sealing device has a certain effect in preventing gas from entering and exiting, its airtightness is poor and cannot ensure that the mixing tank meets the vacuum requirements after evacuation. Utility Model Content
[0004] The purpose of this invention is to provide a sealing structure for a hot melt adhesive mixing tank, which is used to seal the mixing tank to prevent gas from entering or leaving the mixing tank from the shaft and bearing mating area, so that the mixing tank can achieve the required vacuum level.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sealing structure for a hot melt adhesive mixing tank is provided at the transmission device of the hot melt adhesive mixing tank. The transmission device includes a revolution shaft, a rotation shaft, a gearbox, and a stirring paddle shaft. The revolution shaft is fixedly connected to the gearbox. Two stirring paddle shafts are provided inside the gearbox. The revolution shaft is a hollow shaft. The rotation shaft passes through the revolution shaft and is drively connected to the two stirring paddle shafts. The sealing structure has three layers, respectively provided at the stirring paddle shaft, the rotation shaft, and the revolution shaft. The sealing structure includes a stationary ring, a rotating ring, an elastic element, and a fixed sleeve. The elastic element is located between the fixed sleeve and the rotating ring, so that the lower end face of the rotating ring presses against the upper end face of the stationary ring.
[0006] Optionally, the elastic element is a compression spring.
[0007] Optionally, the moving ring is made of silicon carbide.
[0008] Optionally, the stationary ring is a silicone ring.
[0009] Optionally, the impeller shaft is provided with a shoulder, and the fixing sleeve is fixedly provided below the shoulder. The bearing cover at the bottom wall of the gearbox is provided with a first groove. The stationary ring is fixedly provided in the first groove. The moving ring is provided above the stationary ring. The elastic element is provided between the moving ring and the fixing sleeve. The outer peripheral wall of the stationary ring is interference-fitted with the inner peripheral wall of the first groove. The inner peripheral wall of the stationary ring is clearance-fitted with the impeller shaft. The inner peripheral wall of the moving ring is interference-fitted with the impeller shaft.
[0010] In this invention, a triple-seal structure is added to the transmission device of the mixing tank to achieve triple sealing. Gas entering or exiting the mixing tank must overcome the triple seal. The sealing structure specifically includes a stationary ring, a rotating ring, an elastic element, and a fixed sleeve. When the shaft rotates, the lower end face of the rotating ring always remains tightly fitted against the upper end face of the stationary ring, thus preventing gas from entering or exiting. This ensures the sealing performance of the mixing tank, allowing it to meet vacuum requirements after evacuation. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the sealing structure of a hot melt adhesive mixing tank; Figure 2 This is a schematic diagram of a hot melt adhesive mixing tank; Figure 3 This is a schematic diagram of the sealing structure at the agitator shaft.
[0012] In the diagram, 1. Sealing structure; 11. Stationary ring; 12. Moving ring; 13. Elastic element; 14. Fixed sleeve; 2. Revolutionary shaft; 3. Gearbox; 4. Rotation shaft; 5. Agitator shaft; 51. Shoulder; 52. Bearing cover; 53. First groove; 6. Agitator; 7. Upper tank; 8. Frame. Detailed Implementation
[0013] Hereinafter, embodiments will be described with reference to the accompanying drawings.
[0014] See Figure 1-3 This utility model discloses a sealing structure for a hot melt adhesive mixing tank. See also... Figure 1 , Figure 1Partial structure of the mixing tank is shown. The mixing tank includes a frame 8 and an upper tank 7, which can move up and down along the frame 8 to close or separate from the lower tank (not shown). The transmission device of the mixing tank passes through the upper tank 7 from top to bottom and includes a revolution shaft 2, which is connected to a first motor. A gearbox 3 is fixedly connected to the revolution shaft 2, driving the gearbox 3 to rotate as a whole. The revolution shaft 2 is a hollow shaft. A rotation shaft 4 is connected to a second motor, passes through the interior of the revolution shaft 2, and extends into the gearbox 3. Two stirring paddle shafts 5 are installed in the gearbox 3, and each stirring paddle shaft 5 is connected to a stirring paddle 6. The rotation shaft 4 is connected to the two stirring paddle shafts 5 through gears. When the revolution shaft 2 rotates, it drives the gearbox 3 to rotate, which in turn drives the two stirring paddles 6 to revolve around the revolution shaft 2. When the rotation shaft 4 rotates, it drives the two stirring paddles 6 to rotate around their own axes, thereby mixing the hot melt adhesive.
[0015] The sealing structure 1 of this utility model for a hot melt adhesive mixing tank is located at the transmission device and has three layers to seal the mixing tank. These layers are respectively located at the stirring paddle shaft 5, the rotation shaft 4, and the revolution shaft 2. Since the structure and assembly of the sealing structures 1 at each location are similar or identical, the sealing structure 1 at the stirring paddle shaft 5 will be described as an example. See [link to documentation]. Figure 3 The impeller shaft 5 is connected to a bearing located inside the gearbox 3. A bearing cover 52 is provided above the bearing at the bottom, and a first groove 53 is provided on the bearing cover 52. The sealing structure 1 includes a stationary ring 11, a rotating ring 12, an elastic element 13, and a fixing sleeve 14. The stationary ring 11 is fixedly disposed in the first groove 53. The outer peripheral wall of the stationary ring 11 is press-fitted with the inner peripheral wall of the first groove 53, and the inner peripheral wall of the stationary ring 11 is clearance-fitted with the impeller shaft 5. The rotating ring 12 is disposed above the stationary ring 11 and is sleeved on the impeller shaft 5, with a press-fit. The fixing sleeve 14 is fixedly sleeved on the impeller shaft 5. The impeller shaft 5 has a shoulder 51, and the fixing sleeve 14 is disposed below the shoulder 51. An elastic element 13 is provided between the fixing sleeve 14 and the rotating ring 12. The elastic element 13 presses down on the rotating ring 12, so that the lower end face of the rotating ring 12 is tightly attached to the upper end face of the stationary ring 11. When the impeller shaft 5 rotates, the stationary ring 11 remains stationary, while the rotating ring 12 rotates with the impeller shaft 5. Since there is no gap between the first groove 53 and the stationary ring 11, no gap between the rotating ring 12 and the impeller shaft 5, and no gap between the lower end face of the rotating ring 12 and the upper end face of the stationary ring 11, good sealing is ensured, preventing gas from entering or exiting. Furthermore, because the sealing structure 1 has three layers—one at the impeller shaft 5, one at the rotation shaft 4, and one at the revolution shaft 2—gas can be effectively prevented from entering or exiting through the connection between the shaft and the bearing. This triple seal ensures that the mixing tank meets vacuum requirements during evacuation.
[0016] Specifically, the elastic element 13 can be a compression spring; the moving ring 12 can be made of silicon carbide; and the stationary ring 11 can be a silicone ring.
Claims
1. A sealing structure for a hot melt adhesive mixing tank, used to be disposed at the transmission device of the hot melt adhesive mixing tank, the transmission device comprising a revolution shaft, a rotation shaft, a gearbox, and a stirring paddle shaft, the revolution shaft being fixedly connected to the gearbox, two stirring paddle shafts being disposed inside the gearbox, the revolution shaft being a hollow shaft, and the rotation shaft passing through the revolution shaft and being drively connected to the two stirring paddle shafts; characterized in that, The sealing structure has three layers, which are respectively located at the stirring paddle shaft, the rotation shaft, and the revolution shaft; the sealing structure includes a stationary ring, a rotating ring, an elastic element, and a fixed sleeve; the elastic element is located between the fixed sleeve and the rotating ring, so that the lower end face of the rotating ring presses against the upper end face of the stationary ring.
2. The sealing structure of the hot melt adhesive mixing tank as described in claim 1, characterized in that, The elastic element is a compression spring.
3. The sealing structure of the hot melt adhesive mixing tank as described in claim 1, characterized in that, The moving ring is made of silicon carbide.
4. The sealing structure of the hot melt adhesive mixing tank as described in claim 1, characterized in that, The stationary ring is a silicone ring.
5. The sealing structure of the hot melt adhesive mixing tank as described in claim 1, characterized in that, The impeller shaft is provided with a shoulder, and the fixing sleeve is fixedly provided below the shoulder. The bearing cover at the bottom wall of the gearbox is provided with a first groove. The stationary ring is fixedly provided in the first groove. The moving ring is provided above the stationary ring. The elastic element is provided between the moving ring and the fixing sleeve. The outer peripheral wall of the stationary ring is interference-fitted with the inner peripheral wall of the first groove. The inner peripheral wall of the stationary ring is clearance-fitted with the impeller shaft. The inner peripheral wall of the moving ring is interference-fitted with the impeller shaft.