Stretching machine for woven bag production

Abstract

This utility model discloses a stretching machine for woven bag production, including a support base, a support frame on the support base, a servo motor and an eccentric camshaft on the support frame, the servo motor being connected to the eccentric camshaft via a transmission mechanism, a pump water tank fixed on the support frame by two support plates, a water trough on the upper surface of the support base, a shower head between the support frame and the water trough, the pump water tank being connected to the water trough via an inlet pipe, and the pump water tank being connected to the shower head via an outlet pipe, the pump water tank having an active chamber and a rotating chamber inside. This utility model achieves forced circulation of cooling water through the reciprocating motion of a piston plate, avoiding the problem of decreased heat dissipation efficiency caused by increased water temperature in traditional stagnant water cooling, maintaining a stable cooling effect, and improving the consistency of the physical properties of the stretched woven bags.

Description

Technical Field

[0001] This utility model relates to the field of woven bag production technology, and in particular to a stretching machine for woven bag production. Background Technology

[0002] Woven bags are a type of plastic used for packaging. Their raw materials are generally polyethylene, polypropylene, and other chemical plastic raw materials. Woven bags are made of many flat plastic filaments. The plastic filaments extruded from the extruder need to be stretched and cut before they can be truly shaped. Stretching the plastic filaments is to give them a certain strength and elongation for use in the manufacture of woven bags.

[0003] In the woven bag manufacturing process, cooling after the stretching process is a crucial step determining the product's physical properties. Existing technologies (such as the stretching machine disclosed in CN221854914U) generally employ a fixed water tank immersion cooling method. This design has significant drawbacks: because the cooling water does not circulate, the water temperature in the tank gradually rises as production continues, leading to a continuous decrease in cooling efficiency. This static cooling method cannot effectively remove the heat generated during the stretching process, causing the woven bag material to cool rapidly before the polymer chain orientation is fully stable, resulting in molecular structural disorder. This severely affects the tensile strength and dimensional stability of the product, specifically manifesting as woven bags being prone to cracking and deformation in actual use, failing to meet the packaging industry's requirements for product durability. Furthermore, the increased water temperature accelerates surface oxidation of the material, leading to uneven product color and reducing the finished product's appearance quality. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a stretching machine for woven bag production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A stretching machine for woven bag production includes a support base, a support frame on the support base, a servo motor and an eccentric camshaft on the support frame, the servo motor being connected to the eccentric camshaft via a transmission mechanism, a water tank fixedly mounted on the support frame via two support plates, a water trough on the upper surface of the support base, a shower head between the support frame and the water trough, the water tank being connected to the water trough via an inlet pipe, and the water tank being connected to the shower head via an outlet pipe, the water tank having an active chamber and a rotating chamber inside, a reciprocating screw extending to the side of the support plate being rotatably mounted in the rotating chamber, the reciprocating screw being connected to the eccentric camshaft via a linkage mechanism, a piston plate being sealed and slidably mounted in the active chamber, the piston plate being connected to the reciprocating screw via a connecting mechanism.

[0007] Preferably, the transmission mechanism includes a drive gear fixedly mounted on an output shaft of a servo motor, and a transmission gear fixedly mounted on the eccentric camshaft, wherein the drive gear meshes with the transmission gear.

[0008] Preferably, the linkage mechanism includes pulleys fixedly mounted on the eccentric camshaft and the reciprocating lead screw, and the two pulleys are connected by a belt.

[0009] Preferably, the connecting mechanism includes a connecting frame threaded onto a reciprocating screw, the end of which is fixedly connected to a piston plate.

[0010] Preferably, both the inlet pipe and the outlet pipe are equipped with valves, and both valves are one-way valves.

[0011] Preferably, the bottom wall of the water tank is inclined, and the bottom wall of the water tank is inclined toward the water inlet pipe.

[0012] The beneficial effects of this utility model are:

[0013] 1. The reciprocating motion of the piston plate enables forced circulation of cooling water, avoiding the problem of reduced heat dissipation efficiency caused by the rise in water temperature in traditional stagnant water cooling, thus maintaining a stable cooling effect and improving the consistency of physical properties of woven bags after stretching.

[0014] 2. The same servo motor drives both the tensioning mechanism and the water circulation system simultaneously, eliminating the need for an additional power unit. This simplifies the equipment structure, reduces energy consumption, and achieves efficient utilization of power resources.

[0015] 3. A filter screen is installed in the water tank to intercept impurities in the workshop, preventing pollutants from entering the circulation system and affecting the cooling water quality or clogging the pipes, reducing the frequency of equipment maintenance and ensuring production continuity.

[0016] 4. The transmission method using a combination of gears and belts effectively buffers mechanical shocks and improves the smoothness of the transmission process compared to the direct connection of the original solution. It also facilitates independent inspection and maintenance of equipment components. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a stretching machine for woven bag production proposed in this utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the rear structure after vertical sectioning;

[0019] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A;

[0020] Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B.

[0021] In the diagram: 1. Support base, 2. Support frame, 3. Support plate, 4. Pump tank, 5. Inlet pipe, 6. Reciprocating screw, 7. Pulley, 8. Belt, 9. Support plate, 10. Water tank, 11. Shower head, 12. Servo motor 1, 13. Drive gear, 14. Eccentric camshaft, 15. Transmission gear, 16. Moving chamber, 17. Rotating chamber, 18. Piston plate, 19. Connecting frame, 20. Outlet pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figure 1-4 A stretching machine for woven bag production includes a support base 1, a support frame 2 on the support base 1, and a servo motor 12 and an eccentric camshaft 14 on the support frame 2, as shown in the figure. This solution also includes guide rollers and stretching rollers, which are not publicly available. This solution refers to the public disclosure (announcement) number: CN221854914U, specifically a stretching machine for woven bag production. The unchanged parts of the above solution are not described in detail; only the improved parts are described. For example, in the above solution, the servo motor 12 is directly connected to the eccentric camshaft. This solution improves upon this, as follows:

[0024] Servo motor 12 is connected to eccentric camshaft 14 via a transmission mechanism. Pump tank 4 is fixed on the support frame 2 via two support plates 3. Water tank 10 is provided on the upper surface of the support base 1. Shower head 11 is provided between the support frame 2 and water tank 10. Pump tank 4 is connected to water tank 10 via water inlet pipe 5. Pump tank 4 is connected to shower head 11 via water outlet pipe 20. Pump tank 4 has a movable chamber 16 and a rotating chamber 17 inside. Reciprocating screw 6 extending to the side of support plate 3 is rotatably provided in rotating chamber 17. Reciprocating screw 6 is connected to eccentric camshaft 14 via a linkage mechanism. Piston plate 18 is sealed and slidably provided in movable chamber 16. Piston plate 18 is connected to reciprocating screw 6 via a connecting mechanism.

[0025] The transmission mechanism includes a drive gear 13 fixedly mounted on the output shaft of the servo motor 12, and a transmission gear 15 fixedly mounted on the eccentric camshaft 14. The drive gear 13 meshes with the transmission gear 15. Power transmission of the servo motor 12 is achieved by relying on the aforementioned drive gear 13 and transmission gear 15.

[0026] The linkage mechanism includes pulleys 7 fixedly mounted on the eccentric camshaft 14 and the reciprocating lead screw 6, with the two pulleys 7 connected by a belt 8. Power transmission to the servo motor 12 is achieved via the pulleys 7 and belt 8, enabling the reciprocating lead screw 6 to rotate upon startup.

[0027] It should be noted that pulley 7 is a synchronous pulley and belt 8 is a synchronous belt.

[0028] It should be noted that this solution does not disclose how components such as the reciprocating screw 6 are installed with other components via bearing housings or similar means, as this is common knowledge in the mechanical field and will not be elaborated upon. Furthermore, the portion of the reciprocating screw 6 extending to the outside of the pump tank 4 does not have threads on its outer wall.

[0029] The connecting mechanism includes a connecting frame 19 threaded onto the reciprocating screw 6, with the end of the connecting frame 19 fixedly connected to the piston plate 18. As shown in the figure, the connecting frame 19 is U-shaped, and its horizontal portion slides through the inner wall of the rotating chamber 17 and extends into the movable chamber 16. Therefore, the connecting frame 19 has its own limit and will not rotate with the reciprocating screw 6.

[0030] Both the inlet pipe 5 and the outlet pipe 20 are equipped with valves, and both valves are one-way valves. These one-way valves ensure unidirectional water flow.

[0031] The bottom wall of the water tank 10 is inclined, and the bottom wall of the water tank 10 is inclined towards the water inlet pipe 5. As shown in the figure, the inclined bottom wall makes it easier for the water inlet pipe 5 to draw in water.

[0032] Furthermore, a filter screen is installed inside the water tank 10, located above the water inlet pipe 5, to filter and intercept impurities present in the workshop that enter the water tank 10. This filter screen is shown in the diagram but is not labeled; please refer to [reference needed]. Figure 2 As shown in the image.

[0033] Components not specifically described in this utility model are all standard parts and can be purchased from the market. The specific connection methods for each component all employ mature methods from the prior art, and will not be detailed here. Content not described in detail in this specification belongs to prior art known to those skilled in the art.

[0034] In use, the servo motor 12 drives the eccentric camshaft 14 to rotate through the meshing of the drive gear 13 and the transmission gear 15, providing basic power for the stretching action. The eccentric camshaft 14 drives the reciprocating screw 6 to rotate through the pulley 7 and the belt 8, causing the threaded connecting frame 19 to drive the piston plate 18 to reciprocate within the movable chamber 16 of the pump water tank 4. The movement of the piston plate 18 draws cooling water from the water tank 10 through the inlet pipe 5 and delivers the water to the shower head 11 through the outlet pipe 20 to spray and cool the woven bag. The sprayed water falls into the water tank 10 with its inclined bottom wall, is filtered by the filter screen, and is then drawn back into the pump water tank 4, forming a closed-loop circulation. The one-way valves in the inlet pipe 5 and the outlet pipe 20 ensure a stable water flow direction.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stretching machine for the production of woven bags, comprising a load-bearing base (1), characterised in that, The support base (1) is provided with a support frame (2), and the support frame (2) is provided with a servo motor (12) and an eccentric camshaft (14). The servo motor (12) is connected to the eccentric camshaft (14) through a transmission mechanism. The support frame (2) is fixedly provided with a pump water tank (4) through two support plates (3). The upper end face of the support base (1) is provided with a water tank (10). A shower head (11) is provided between the support frame (2) and the water tank (10). The pump water tank (4) is connected to the water supply through a water inlet pipe (5). The water tank (4) is connected to the shower head (11) via the water outlet pipe (20). The water tank (4) is provided with an active chamber (16) and a rotating chamber (17). A reciprocating screw (6) extending to the side of the support plate (3) is rotatably provided in the rotating chamber (17). The reciprocating screw (6) is connected to the eccentric camshaft (14) via a linkage mechanism. A piston plate (18) is provided in the active chamber (16) and is sealed and slidably provided. The piston plate (18) is connected to the reciprocating screw (6) via a connecting mechanism.

2. A stretching machine for the production of woven bags according to claim 1, characterized in that, The transmission mechanism includes a drive gear (13) fixedly mounted on the output shaft of a servo motor (12), and a transmission gear (15) fixedly mounted on the eccentric camshaft (14). The drive gear (13) meshes with the transmission gear (15).

3. The stretching machine for woven bag production according to claim 2, characterized in that, The linkage mechanism includes pulleys (7) fixedly mounted on the eccentric camshaft (14) and the reciprocating lead screw (6), and the two pulleys (7) are connected by a belt (8).

4. The stretching machine for woven bag production according to claim 3, characterized in that, The connecting mechanism includes a connecting frame (19) threadedly mounted on the reciprocating screw (6), and the end of the connecting frame (19) is fixedly connected to the piston plate (18).

5. A stretching machine for woven bag production according to claim 4, characterized in that, Both the inlet pipe (5) and the outlet pipe (20) are equipped with valves, and both valves are one-way valves.

6. A stretching machine for woven bag production according to claim 5, characterized in that, The bottom wall of the water tank (10) is inclined, and the bottom wall of the water tank (10) is inclined toward the water inlet pipe (5).

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