Cross-stitch machine outlet sprocket cooling mechanism

Abstract

This utility model discloses a cooling mechanism for the outlet sprocket of a horizontal drawing machine. The sprocket has a sprocket shaft in the middle, and the upper and lower ends of the sprocket shaft are rotatably connected to the sprocket seat through a first bearing and a second bearing, respectively. A cooling blind hole is axially arranged in the middle of the sprocket shaft. The upper end of the cooling blind hole is open, and the lower end of the cooling blind hole extends to near the second bearing. A rotary joint is sealed to the upper end of the cooling blind hole, and a water inlet pipe and a water outlet pipe are sealed to the rotary joint. The rotary joint has a hollow space inside, and a cooling pipe is nested in the hollow space. The upper end of the cooling pipe is connected to the water inlet pipe, and the lower end of the cooling pipe extends to near the lower end of the cooling blind hole. A cylindrical gap is formed between the cooling pipe and the hollow space, and between the cooling pipe and the cooling blind hole. The upper end of the cylindrical gap is connected to the water outlet pipe, and the lower end of the cylindrical gap is connected to the interior of the cooling pipe. This solution cools the sprocket shaft, protects the bearing, and ensures its service life.

Description

Technical Field

[0001] This utility model belongs to the technical field of film transverse stretching equipment, and specifically relates to a cooling mechanism for the outlet sprocket of a transverse stretching machine. Background Technology

[0002] In film production, transverse stretching equipment (referred to as a transverse stretcher) is commonly used to stretch the film laterally. The transverse stretcher has a chain that moves along its length, with multiple chain clamps that hold the film on both sides. The chain clamps run along an adjustable track, allowing for stretching and retraction of the film during transport. The chain is typically circular and deflects at the stretcher's exit via a sprocket, returning to the stretcher's inlet. Due to the high temperature inside the transverse stretcher, the chain clamps and chain itself are heated, leading to increased temperature of the sprocket shaft and bearings upon contact. Operating at high temperatures significantly reduces the bearing's lifespan. Therefore, the sprocket bearings in existing transverse stretchers frequently need replacement, negatively impacting both economic efficiency and production productivity. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a cooling mechanism for the outlet sprocket of a horizontal drawing machine, which solves the problem of excessively high bearing operating temperature and short service life of the outlet sprocket of the existing horizontal drawing machine, and realizes the cooling of the sprocket shaft, thereby protecting the bearing and helping the sprocket to work stably for a long time.

[0004] According to the technical solution of this utility model, this utility model provides a cooling mechanism for the outlet sprocket of a horizontal drawing machine. The sprocket has a sprocket shaft in the middle, which is vertically arranged. The upper and lower ends of the sprocket shaft are rotatably connected to the sprocket seat through a first bearing and a second bearing, respectively. A cooling blind hole is axially arranged in the middle of the sprocket shaft. The upper end of the cooling blind hole is open, and the lower end of the cooling blind hole extends to near the second bearing. A rotary joint is sealed to the upper end of the cooling blind hole. A water inlet pipe and a water outlet pipe are sealed to the rotary joint. The rotary joint has a hollow space inside, and a cooling pipe is nested in the hollow space. The upper end of the cooling pipe is connected to the water inlet pipe, and the lower end of the cooling pipe extends to near the lower end of the cooling blind hole. A cylindrical gap is formed between the cooling pipe and the hollow space, and between the cooling pipe and the cooling blind hole. The upper end of the cylindrical gap is connected to the water outlet pipe, and the lower end of the cylindrical gap is connected to the interior of the cooling pipe.

[0005] In some implementations, the lower end of the cooling pipe is beveled.

[0006] In some embodiments, an upper oil receiving pan and a lower oil receiving pan are also fitted on the sprocket shaft. The upper oil receiving pan is located between the first bearing and the sprocket disc, and the lower oil receiving pan is located between the second bearing and the sprocket disc.

[0007] In some embodiments, the sprocket seat includes a top plate, a side plate, and a bottom plate connected together. Each of the top plate and the bottom plate is provided with a bearing mounting hole, and a first bearing and a second bearing are respectively embedded in the bearing mounting holes of the top plate and the bottom plate.

[0008] In some embodiments, the bearing mounting holes in the top plate are through holes, and a bearing cap is also provided on the top plate, with a clearance hole in the middle of the bearing cap corresponding to the rotary joint.

[0009] In some embodiments, the side plates are two plates that are perpendicularly connected, the top plate and the bottom plate are both arranged horizontally, and the side plates are perpendicular to the top plate and the bottom plate; the sprocket seat is open on the side without the side plates.

[0010] Compared with the prior art, the beneficial technical effects of this utility model are as follows: This utility model discloses a cooling mechanism for the outlet sprocket of a horizontal drawing machine. A blind cooling hole is opened at the center of the sprocket shaft, and a cooling pipe is inserted downwards. Cold water enters through the cooling pipe and overflows from bottom to top, flowing upwards and finally exiting from top to bottom. During this process, the water flows past the bearing areas at both ends of the sprocket shaft, thus preventing the bearing temperature from becoming too high. In existing horizontal drawing machines, the heat received by the outlet sprocket comes from the chain clamps and chain. Therefore, heat conduction occurs from the outer teeth of the sprocket shaft to the inner sprocket shaft, and then to both ends of the sprocket shaft, ultimately leading to excessively high bearing temperatures and reduced lifespan. This solution effectively cools the sprocket shaft, improving the bearing operating temperature, protecting the bearing, ensuring its service life, promoting long-term stable operation of the sprocket, reducing maintenance frequency and costs, and improving work efficiency. Attached Figure Description

[0011] Figure 1 This is a cross-sectional structural diagram provided by this utility model.

[0012] Figure 2 This is a three-dimensional structural diagram provided by this utility model.

[0013] Explanation of reference numerals in the attached figures: 1. Sprocket; 2. Sprocket shaft; 3. First bearing; 4. Second bearing; 5. Sprocket seat; 6. Cooling blind hole; 7. Rotary joint; 8. Water inlet pipe; 9. Drain pipe; 10. Cooling pipe; 11. Upper oil pan; 12. Lower oil pan; 13. Top plate; 14. Side plate; 15. Bottom plate; 16. Bearing cover. Detailed Implementation

[0014] This utility model provides a cooling mechanism for the outlet sprocket of a horizontal drawing machine, which solves the problems of excessively high bearing operating temperature and short service life of the outlet sprocket of existing horizontal drawing machines. It achieves cooling of the sprocket shaft, thereby protecting the bearing and contributing to the long-term stable operation of the sprocket.

[0015] Please see Figure 1 , Figure 2 This utility model discloses a cooling mechanism for the outlet sprocket of a horizontal drawing machine, primarily for the protection of the bearings. The sprocket 1 has a sprocket shaft 2 in the middle, which is vertically positioned. The upper and lower ends of the sprocket shaft 2 are rotatably connected to the sprocket seat 5 via a first bearing 3 and a second bearing 4, respectively. The sprocket 1 is located at the outlet of the horizontal drawing machine, and a chain is driven onto it. More specific technical details regarding the horizontal drawing machine can be found in existing technology and are not the focus of this utility model; therefore, they will not be elaborated upon.

[0016] In this invention, a cooling blind hole 6 is axially provided in the middle of the sprocket shaft 2. The upper end of the cooling blind hole 6 is open, and the lower end of the cooling blind hole 6 extends to near the second bearing 4. In this way, while ensuring the lower end is sealed and the structural strength is maintained, the cooling water can reach the area where the second bearing 4 is located at the lower end as much as possible. The upper opening penetrates through the end face of the sprocket shaft and thus also covers the area where the first bearing 3 is located at the upper end. This effectively achieves cooling and temperature reduction of the bearing area at the end of the sprocket shaft, avoids high temperature at the bearing, and fundamentally solves the problem of bearing overheating damaging its service life.

[0017] A rotary joint 7 is sealed to the upper end of the cooling blind hole 6. An inlet pipe 8 and a drain pipe 9 are sealed to the rotary joint 7. The rotary joint 7, also known as a two-way rotary joint, is an existing part that maintains the required sealed connection while rotating. The rotary joint 7 has a cylindrical hollow space inside, within which a cooling pipe 10 is nested. The upper end of the cooling pipe 10 is connected to the inlet pipe 8, and the lower end of the cooling pipe 10 extends to near the lower end of the cooling blind hole 6 (with a gap between it and the lower end of the cooling blind hole 6 to allow communication between the inner and outer spaces of the cooling pipe). Cylindrical gaps are formed between the cooling pipe 10 and the hollow space, and between the cooling pipe 10 and the cooling blind hole 6. The upper end of the cylindrical gap is connected to the drain pipe 9, and the lower end is connected to the interior of the cooling pipe 10. The rotary joint 7, cooling blind hole 6, cooling pipe 10, and sprocket shaft 2 are coaxially arranged.

[0018] The working process of this scheme is as follows. Coolant (e.g., cooling water) is introduced through the water inlet pipe 8. The coolant enters the cooling blind hole 6 in the middle of the sprocket shaft 2 along the cooling pipe 10. Then, the coolant overflows from bottom to top and flows from bottom to top in the cylindrical gap, increasing the cooling time and absorbing the heat in the sprocket shaft 2. Finally, the coolant after absorbing heat is discharged from the upper end of the cylindrical gap to the drain pipe 9, and is output, collected or circulated through the drain pipe 9.

[0019] Preferably, the lower end of the cooling pipe 10 is beveled to increase the outlet area, thereby ensuring smooth coolant output and avoiding the problem of the lower end of the cooling pipe 10 being blocked due to installation errors or mechanical mistakes.

[0020] Preferably, the sprocket shaft 2 is further fitted with an upper oil receiving pan 11 and a lower oil receiving pan 12. The upper oil receiving pan 11 is located between the first bearing 3 and the disc of the sprocket 1, and the lower oil receiving pan 12 is located between the second bearing 4 and the disc of the sprocket 1. The upper oil receiving pan 11 and the lower oil receiving pan 12 are used to collect the flowing lubricating oil and prevent the lubricating oil from flowing out of the sprocket and contaminating the film.

[0021] Preferably, the sprocket seat 5 includes a top plate 13, a side plate 14, and a bottom plate 15 connected together, with a cross-section formed as shown in the figure. Figure 1 The C-shaped sprocket is positioned within the space enclosed by the sprocket seat 5. Both the top plate 13 and the bottom plate 15 have bearing mounting holes, into which the first bearing 3 and the second bearing 4 are respectively installed. Furthermore, the bearing mounting holes in the top plate 13 are through holes, facilitating the installation of components such as the rotary joint 7. A bearing cap 16 is also provided on the top plate 13, with a clearance hole in the center corresponding to the rotary joint 7. The diameter of the clearance hole is larger than that of the rotary joint 7. The bearing cap 16 is used to press down on the outer ring of the upper first bearing 3, bearing axial force. The bearing mounting holes in the bottom plate 15 are blind holes with an open top, protecting the lower end. A small hole is provided in the center of the bottom of this blind hole in the bottom plate 15 to prevent the formation of a sealed gap that could affect the movement of the mechanical structure.

[0022] Please also refer to Figure 2 Preferably, the side plates 14 are two plates connected perpendicularly, while the top plate 13 and bottom plate 15 are both horizontally arranged. The side plates 14 are perpendicular to both the top plate 13 and the bottom plate 15, and the sprocket seat 5 is open on the side without the side plates 14. This forms a semi-enclosed structure for the sprocket 1, with for example, more than 3 / 4 of the teeth of the sprocket 1 exposed on the side plates 14 and the top plate 13 to meet the required chain turning angle. The side plates 14 employ a vertical connection structure, which, while ensuring structural simplicity and a small support range, provides sufficient strength to guarantee structural stability.

[0023] This utility model discloses a cooling mechanism for the outlet sprocket of a horizontal drawing machine. A blind cooling hole is opened at the center of the sprocket shaft, and a cooling pipe is inserted downwards. Cold water enters through the cooling pipe and overflows from bottom to top, flowing upwards and finally exiting from top to bottom. During this process, the water flows past the bearing areas at both ends of the sprocket shaft, thus preventing the bearing temperature from becoming too high. In existing horizontal drawing machines, the heat received by the outlet sprocket comes from the chain clamps and chain. Therefore, heat conduction occurs from the outer teeth of the sprocket shaft to the inner sprocket shaft, and then to both ends of the sprocket shaft, ultimately leading to excessively high bearing temperatures and reduced lifespan. This solution effectively cools the sprocket shaft, improving the bearing operating temperature, protecting the bearing, ensuring its service life, promoting long-term stable operation of the sprocket, reducing maintenance frequency and costs, and improving work efficiency.

Claims

1. A cooling mechanism for the outlet sprocket of a horizontal drawing machine, characterized in that, The sprocket (1) has a sprocket shaft (2) in the middle. The sprocket shaft (2) is vertically arranged. The upper and lower ends of the sprocket shaft (2) are rotatably connected to the sprocket seat (5) through the first bearing (3) and the second bearing (4) respectively. A cooling blind hole (6) is axially provided in the middle of the sprocket shaft (2). The upper end of the cooling blind hole (6) is open, and the lower end of the cooling blind hole (6) extends to the vicinity of the second bearing (4). A rotary joint (7) is sealed to the upper end of the cooling blind hole (6). A water inlet pipe (8) and a drain pipe (9) are sealed to the rotary joint (7). The rotary joint (7) has a hollow space inside, and a cooling pipe (10) is nested in the hollow space. The upper end of the cooling pipe (10) is connected to the water inlet pipe (8), and the lower end of the cooling pipe (10) extends to the vicinity of the lower end of the cooling blind hole (6). A cylindrical gap is formed between the cooling pipe (10) and the hollow space, and between the cooling pipe (10) and the cooling blind hole (6). The upper end of the cylindrical gap is connected to the drain pipe (9), and the lower end of the cylindrical gap is connected to the interior of the cooling pipe (10).

2. The cooling mechanism for the outlet sprocket of the cross-drawing machine according to claim 1, characterized in that, The lower end of the cooling pipe (10) is cut at an angle.

3. The cooling mechanism for the outlet sprocket of the cross-drawing machine according to claim 1, characterized in that, The sprocket shaft (2) is also fitted with an upper oil receiving pan (11) and a lower oil receiving pan (12). The upper oil receiving pan (11) is located between the first bearing (3) and the disc of the sprocket (1), and the lower oil receiving pan (12) is located between the second bearing (4) and the disc of the sprocket (1).

4. The cooling mechanism for the outlet sprocket of the cross-drawing machine according to any one of claims 1-3, characterized in that, The sprocket seat (5) includes a top plate (13), a side plate (14) and a bottom plate (15) connected to each other. Both the top plate (13) and the bottom plate (15) are provided with bearing mounting holes. The first bearing (3) and the second bearing (4) are respectively embedded in the bearing mounting holes of the top plate (13) and the bottom plate (15).

5. The cooling mechanism for the outlet sprocket of the cross-drawing machine according to claim 4, characterized in that, The bearing mounting hole of the top plate (13) is a through hole. A bearing cover (16) is also provided on the top plate (13). The bearing cover has a clearance hole in the middle that corresponds to the rotary joint (7).

6. The cooling mechanism for the outlet sprocket of the cross-drawing machine according to claim 4, characterized in that, The side plate (14) consists of two plates that are perpendicularly connected. The top plate (13) and the bottom plate (15) are both horizontally arranged. The side plate (14) is perpendicular to the top plate (13) and the bottom plate (15). The sprocket seat (5) is open on the side without the side plate (14).

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