Double-gas-path mechanical expansion shaft

Abstract

The utility model provides a double-gas-path mechanical expansion shaft, and belongs to the technical field of mechanical expansion shafts. Comprising an inflatable body, an expansion assembly and a ventilation assembly, a movable cavity is formed in the inflatable body, the expansion assembly comprises an expansion sliding block, a piston rod is arranged in the center of the expansion sliding block, pistons arranged on the two sides of the expansion sliding block are arranged on the piston rod, air holes are formed in the centers of the pistons, and a flat position is arranged on one side of the top end of the piston rod; the ventilation assembly comprises a ventilation shaft arranged at the top of the inflatable body, an air inlet connector is arranged at the top of the ventilation shaft and comprises a center air channel and an eccentric air channel, and an air pipe arranged in the ventilation shaft is arranged between the center air channel and the air hole. Under the combined action of the air inlet connector, the air pipe, the air hole, the air cavity and the like, compressed air is conveyed to enable the expansion sliding block to move up and down, then the expansion block moves towards the outer side along the expansion opening to be expanded with the inner wall of a coiled material and moves towards the inner side to be loosened from the coiled material, the double-air-path structure in the double-air-path mechanical expansion shaft is simpler, and the comprehensive cost is reduced.

Description

Technical Field

[0001] The utility model provides a dual-air-path mechanical expansion shaft, belonging to the technical field of mechanical expansion shafts. Background Art

[0002] Inflatable shafts are mainly used in the film or coil industry and are installed on mechanical equipment such as slitting machines and winders. After the coil is loaded, the outer diameter of the inflatable shaft is expanded through air bags or mechanical structures to achieve the purpose of tightening the inner hole of the material. The coil can then be slitting or winding for various processing purposes.

[0003] Application No. CN202320924484.3 discloses a dual-air-circuit built-in cylinder mechanical expansion shaft, comprising an expansion body, an expansion mechanism and a ventilation mechanism; an active chamber is provided inside the expansion body; an expansion port connected to the active chamber is provided on the side of the expansion body; the expansion mechanism comprises an expansion block, an expansion slider, a piston rod and a piston; one side of the expansion block is laterally slidably arranged in the expansion port; the expansion slider is movably arranged in the active chamber; a wedge-shaped groove is provided on the side of the expansion slider; one side of the expansion block is slidably arranged in the wedge-shaped groove; the piston rod is arranged at the bottom of the expansion slider; a first air hole is provided at the bottom of the piston rod; the piston is arranged on the side of the piston rod and slidably arranged on the inner wall of the active chamber; the ventilation mechanism comprises a rotating shaft, a rotary joint and a first air pipe; the rotating shaft is arranged at the top of the expansion body; the rotary joint is arranged at the top of the rotating shaft; the first air pipe is arranged in the rotating shaft and the expansion slider and the two ends of the first air pipe are respectively connected to the rotary joint and the first air hole.

[0004] Based on the above search and the existing technology, it is found that the current internal air circuit inevitably has two air pipes, which are connected to the two internal air circuits respectively, which inevitably makes the air circuit structure inside the device more complicated and increases the overall cost. Based on this, the utility model provides a dual air circuit mechanical expansion shaft. Utility Model Content

[0005] The technical problem solved by the utility model is that the structures of the two internal gas paths are more complicated, which increases the overall cost.

[0006] In order to solve the technical problem, the technical solution provided by the present invention is: a dual-air-path mechanical expansion shaft, comprising an air-expanding body, an expansion assembly and a ventilation assembly, the air-expanding body is provided with an active chamber, the expansion assembly comprises an expansion slider placed in the active chamber, a piston rod is provided at the center of the expansion slider, the piston rod is provided with pistons placed on both sides of the expansion slider, an air hole is provided at the center of the piston, and a flat position is provided on one side of the top of the piston rod; the ventilation assembly comprises a ventilation shaft placed at the top of the air-expanding body, the top of the ventilation shaft is rotatably connected to an air inlet joint, the air inlet joint comprises a central air channel and an eccentric air channel arranged on one side of the central air channel, and an air pipe placed in the ventilation shaft is provided between the central air channel and the air hole.

[0007] Furthermore, the side of the inflatable body is provided with an expansion port connected to the active cavity, the expansion assembly also includes an expansion block placed inside the expansion port and matched with the expansion slider, and the piston is movably arranged in the active cavity.

[0008] Furthermore, a sealing plug is provided at the bottom of the inflatable body, and a sealing cavity 1 is formed between the sealing plug, the piston below, the piston rod, and the movable cavity.

[0009] Furthermore, a side wall of the expansion block close to the expansion slider is provided with an inclined wedge surface, and an outer side wall of the expansion slider is provided with a wedge groove matching the wedge surface.

[0010] Furthermore, an air cavity is provided in the ventilation shaft and is located outside the trachea. A central air intake interface connected to the central airway is provided on the air intake joint. An eccentric air intake interface connected to the eccentric airway is provided on the air intake joint.

[0011] Furthermore, a plurality of guide wheels are provided on the outer side of the inflatable body at even intervals in a rolling manner.

[0012] Beneficial effects of the utility model:

[0013] Under the joint action of the air inlet joint, air pipe, air hole, air cavity, etc., the compressed air can be delivered to move the expansion slider up and down, thereby causing the expansion block to move outward along the expansion opening to tighten with the inner wall of the coil, and move inward to loosen the coil. The dual air path structure inside the dual air path mechanical expansion shaft is simpler and reduces the overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the overall structure of a dual-air-path mechanical expansion shaft.

[0015] Figure 2 This is an overall plan view of a dual-air-path mechanical expansion shaft according to the present invention.

[0016] Figure 3 The figure is a partial structural diagram of a dual-air-path mechanical expansion shaft of the utility model.

[0017] Figure 4 The utility model is a schematic diagram of the air inlet joint structure of a dual-air-path mechanical expansion shaft.

[0018] Figure 5 The utility model is a schematic diagram of the sealing plug structure of a dual-air-path mechanical expansion shaft.

[0019] Figure 6 The utility model is a schematic diagram of the expansion block structure of a dual-pneumatic mechanical expansion shaft.

[0020] 1. Inflatable body; 2. Expansion assembly; 3. Ventilation assembly; 4. Movable chamber; 5. Expansion slider; 6. Piston rod; 7. Expansion block; 8. Piston; 9. Air hole; 10. Flat position; 11. Ventilation shaft; 12. Air inlet connector; 13. Central air channel; 14. Eccentric air channel; 15. Air pipe; 16. Sealing plug; 17. Wedge groove; 18. Central air inlet interface; 19. Eccentric air inlet interface; 20. Guide wheel. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] According to the attached Figure 1 、 2 , 3, 5, 6: The utility model provides a dual-pneumatic mechanical expansion shaft: including a pneumatic expansion body 1, an expansion component 2 and a ventilation component 3. The outer side of the pneumatic expansion body 1 is provided with a plurality of guide wheels 20 at even intervals along the upper and lower sides, which facilitates the product to be processed to be easily rolled on the outer side of the pneumatic expansion body 1. The pneumatic expansion body 1 is provided with an active cavity 4 inside, a sealing plug 16 is provided at the bottom of the pneumatic expansion body 1, and an expansion port connected to the active cavity 4 is provided on the side of the pneumatic expansion body 1. The expansion component 2 includes an expansion slider 5 placed in the active cavity 4, a piston rod 6 is provided in the center of the expansion slider 5, and pistons 8 are provided on the piston rod 6 and placed on both sides of the expansion slider 5. An air hole 9 is provided in the center, a flat position 10 is provided on one side of the top of the piston rod 6, and a sealed chamber is formed between the sealing plug 16, the lower piston 8, the piston rod 6, and the active chamber 4. The expansion assembly 2 also includes an expansion block 7 placed on the inner side of the expansion port and matched with the expansion slider 5. The piston 8 is movably arranged in the active chamber 4. The side wall of the expansion block 7 close to the expansion slider 5 is provided with an inclined wedge surface, and the outer wall of the expansion slider 5 is provided with a wedge groove 17 matched with the wedge surface, ensuring that as the expansion slider 5 moves up and down, the expansion block 7 can move outward along the expansion port to expand with the inner wall of the coil, and move inward to loosen the coil, thereby realizing easy material replacement.

[0023] According to the attached Figure 2 、 34: The ventilation assembly 3 includes a ventilation shaft 11 placed on the top of the inflatable body 1, and the top of the ventilation shaft 11 is rotatably connected to the air intake joint 12. The air intake joint 12 includes a central airway 13 and an eccentric airway 14 arranged on one side of the central airway 13. A trachea 15 is provided between the central airway 13 and the air hole 9 and is provided in the ventilation shaft 11. An air cavity is provided in the ventilation shaft 11 and is provided on the outside of the trachea 15. A central air intake interface 18 connected to the central airway 13 is provided on the air intake joint 12. A trachea 15 is provided on the air intake joint 12 and is connected to the eccentric airway 14. The external compressed air is delivered to the sealed chamber 1 through the central air inlet interface 18, the central air channel 13, the air pipe 15, and the air hole 9. The pressure generated by the external compressed air pushes the lower piston 8, thereby driving the expansion slider 5 to move upward. The external compressed air enters the eccentric air channel 14 through the eccentric air inlet interface 19 and enters the air cavity, and enters the top of the upper piston 8 through the gap between the flat position 10 and the air cavity. The pressure generated by the external compressed air pushes the upper piston 8 to move downward, thereby driving the expansion slider 5 to move downward.

[0024] Principle of the utility model

[0025] When in use, the central air inlet interface 18 and the eccentric air inlet interface 19 are connected to the solenoid valve. The device has two air paths, air path A: external compressed air is transported to the sealed chamber 1 through the central air inlet interface 18, the central air channel 13, the air pipe 15, and the air hole 9. The pressure generated by the external compressed air pushes the lower piston 8, thereby driving the expansion slider 5 to move upward; air path B: external compressed air enters the eccentric air channel 14 through the eccentric air inlet interface 19 and enters the air cavity, and enters the top of the upper piston 8 through the gap between the flat position 10 and the air cavity. The pressure generated by the external compressed air pushes the upper piston 8 downward, thereby driving the expansion slider 5 to move downward. As the expansion slider 5 moves up and down, the expansion block 7 can move outward along the expansion port to expand with the inner wall of the coil, and move inward to loosen the coil, thereby realizing easy material replacement, making the dual air path structure inside the dual air path mechanical expansion shaft simpler and reducing the overall cost.

[0026] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A dual-pneumatic mechanical expansion shaft, comprising an expansion body (1), an expansion assembly (2) and a vent assembly (3), characterized in that: The inflatable body (1) is provided with an active chamber (4) inside, the expansion assembly (2) includes an expansion slider (5) placed in the active chamber (4), a piston rod (6) is provided at the center of the expansion slider (5), and a piston (8) is provided on the piston rod (6) and is placed on both sides of the expansion slider (5), an air hole (9) is provided at the center of the piston (8), and a flat position (10) is provided on one side of the top of the piston rod (6); the ventilation assembly (3) includes a ventilation shaft (11) placed on the top of the inflatable body (1), and the top of the ventilation shaft (11) is rotatably connected to an air intake connector (12), and the air intake connector (12) includes a central air channel (13) and an eccentric air channel (14) arranged on one side of the central air channel (13), and an air pipe (15) placed in the ventilation shaft (11) is provided between the central air channel (13) and the air hole (9).

2. The dual-pneumatic mechanical expansion shaft according to claim 1, characterized in that: The side of the inflatable body (1) is provided with an expansion port communicating with the active chamber (4); the expansion assembly (2) further comprises an expansion block (7) disposed inside the expansion port and cooperating with the expansion slider (5); and the piston (8) is movably disposed in the active chamber (4).

3. The dual-pneumatic mechanical expansion shaft according to claim 1, characterized in that: A sealing plug (16) is provided at the bottom of the inflatable body (1), and a sealing cavity 1 is formed between the sealing plug (16), the piston (8) below, the piston rod (6), and the movable cavity (4).

4. The dual-pneumatic mechanical expansion shaft according to claim 2, characterized in that: The expansion block (7) is provided with an inclined wedge surface on the side wall close to the expansion slider (5), and the outer side wall of the expansion slider (5) is provided with a wedge groove (17) matched with the wedge surface.

5. The dual-pneumatic mechanical expansion shaft according to claim 1, characterized in that: An air cavity is provided in the ventilation shaft (11) and is located outside the trachea (15). A central air intake interface (18) communicating with the central air passage (13) is provided on the air intake connector (12). An eccentric air intake interface (19) communicating with the eccentric air passage (14) is provided on the air intake connector (12).

6. The dual-pneumatic mechanical expansion shaft according to claim 1, characterized in that: A plurality of guide wheels (20) are provided on the outer side of the inflatable body (1) at even intervals in a rolling manner.

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