A spinning shrinking machine for processing the drum of a tumble dryer

Abstract

The present invention provides a rotary shrinking machine for processing a drum of a drum dryer, comprising: a tensioning device for positioning a workpiece drum, a motor and a transmission structure for driving the workpiece drum to rotate, and a rotary wheel for rotary shrinking and forming the workpiece drum; the characteristics are that the axes of the workpiece drum, the first rotary wheel, the second rotary wheel and the third rotary wheel are parallel to each other in the same vertical plane; the first rotary wheel is fixed-axis rotationally matched and sleeved on the first rotary wheel shaft and positioned on the outer side of the workpiece drum; the second rotary wheel and the third rotary wheel are stacked and sleeved on the second rotary wheel shaft and positioned on the inner side of the workpiece drum; the inner diameter of the second rotary wheel is larger than the outer diameter of the second rotary wheel shaft, so that the second rotary wheel radially deflects around the second rotary wheel shaft under the pressure of the first rotary wheel; the third rotary wheel is fixed-axis rotationally matched with the second rotary wheel shaft; the first rotary wheel translated under the drive of the first oil cylinder, and the second and third rotary wheels translated under the drive of the second oil cylinder apply pressure to the cylindrical wall of the workpiece drum from both sides to complete the shrinking of the workpiece drum. The second rotating wheel can deflect radially during rotation to form a flexible contact with the workpiece roller. The workpiece roller is evenly pressurized during the shrinking forming process without wrinkles.

Description

Technical Field

[0001] The invention belongs to the technical field of sheet metal forming, and in particular relates to a necking machine, and its IPC classification number is B21D. Background Art

[0002] The workpiece drum used in existing washing machines, dryers and dehydrators has a narrower diameter at the end than the middle part, and needs to be shrunk by a shrinking machine. For example, a washing machine workpiece drum shrinking machine disclosed in Chinese invention patent CN103639309B and Chinese invention patent application CN111496045A positions two rotating wheels distributed up and down at one end of the workpiece drum, and completes the shrinking of the workpiece drum by driving the workpiece drum to rotate and adjusting the position of the rotating wheels. The defect of this technical solution is that before the workpiece drum rotates, the rotating wheel and the workpiece drum are kept close but not in contact with the workpiece drum. After the workpiece drum rotates, the rotating wheel is driven by the feeding mechanism to gradually approach the workpiece drum and apply pressure to the end of the workpiece drum. In the spinning process, since the rotating wheel and the rotating workpiece drum are in rigid contact, during the period when the rotating wheel gradually approaches the workpiece drum but has not reached the final positioning position, the end of the formed workpiece drum will appear wrinkled due to uneven pressure from the rotating wheel.

[0003] For relevant terminology and common knowledge, please refer to the 1983 or 1997 edition of "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" published by Machinery Industry Press, and the 2001 edition of "Practical Sheet Metal Technology Handbook". Summary of the invention

[0004] To solve the above problems, the present invention provides a rotary shrinking machine for processing a drum of a drum dryer, comprising: a tensioning device for positioning a workpiece drum, a motor and a transmission structure for driving the workpiece drum to rotate, and a rotary wheel for rotary shrinking and forming the workpiece drum; the characteristics are that the axes of the workpiece drum, the first rotary wheel, the second rotary wheel and the third rotary wheel are parallel to each other in the same vertical plane; the first rotary wheel is fixed-axis rotationally matched and sleeved on the first rotary wheel shaft and positioned on the outer side of the workpiece drum; the second rotary wheel and the third rotary wheel are stacked and sleeved on the second rotary wheel shaft and positioned on the inner side of the workpiece drum; the inner diameter of the second rotary wheel is larger than the outer diameter of the second rotary wheel shaft, so that the second rotary wheel radially deflects around the second rotary wheel shaft under the pressure of the first rotary wheel; the third rotary wheel is fixed-axis rotationally matched with the second rotary wheel shaft; the first rotary wheel translated under the drive of the first oil cylinder, and the second and third rotary wheels translated under the drive of the second oil cylinder apply pressure to the cylindrical wall of the workpiece drum from both sides to complete the shrinking of the workpiece drum.

[0005] Preferably, the shrinking machine also includes a pair of supporting wheels, which are arranged in mirror symmetry in the vertical plane, and abut against the left semi-cylindrical surface of the second wheel axis when the second wheel deflects radially, and the right semi-cylindrical surface of the second wheel axis is tangent to the cylindrical surface of the inner wall of the workpiece roller.

[0006] Specifically, the tensioning device includes a chuck and claws; the claws are evenly distributed on the outer circumference of the chuck and can be extended and retracted along the radial direction of the chuck. The extended claws tighten and position the workpiece roller from the inner side of the workpiece roller; the chuck is driven to rotate by a motor, driving the workpiece roller to rotate.

[0007] Specifically, the shrinking machine also includes a frame that can move up and down above the workpiece roller, and the frame is fixedly installed with a first oil cylinder and a second oil cylinder, the piston rod of the first oil cylinder is fixedly installed with a first rotating wheel frame, and the first rotating wheel frame is fixedly installed with a first rotating wheel shaft; the piston rod of the second oil cylinder is fixedly installed with a second rotating wheel frame, and the second rotating wheel frame is fixedly installed with a second rotating wheel shaft; the first oil cylinder and the second oil cylinder are arranged in a manner that the extending directions of the piston rod of the first oil cylinder and the piston rod of the second oil cylinder are opposite.

[0008] Specifically, the piston rod of the second oil cylinder is also fixedly mounted with a pair of supporting roller frames, and the pair of supporting roller frames are respectively fixedly mounted with supporting roller shafts, and the pair of supporting rollers are respectively mounted on the pair of supporting roller shafts in a fixed-axis rotatable manner.

[0009] Specifically, the outer circumference of the first rotating wheel includes an upper end and a lower end, the outer diameter of the upper end remains unchanged, and the outer diameter of the lower end gradually narrows; the outer circumference of the third rotating wheel includes an upper end and a lower end, the outer diameter of the upper end gradually expands, and the outer diameter of the lower end remains unchanged; the difference in outer diameters between the first upper end and the first lower end of the first rotating wheel and the difference in outer diameters between the second upper end and the second lower end of the third rotating wheel are equal to the difference between the inner diameter of the second rotating wheel and the outer diameter of the second rotating wheel shaft.

[0010] Specifically, the outer diameter of the outer circumference of the second roller remains unchanged, and the amplitude of the radial deflection is equal to the difference between the inner diameter of the second roller and the outer diameter of the second roller shaft.

[0011] Specifically, the upper end of the first roller and the outer circumference of the second roller are indirectly abutted via the workpiece roller, the lower end of the first roller and the upper end of the third roller are indirectly abutted via the workpiece roller, and the workpiece roller completes the shrinking deformation with the two indirectly abutted contours as the generatrix shape.

[0012] The technical means adopted by the present invention and the beneficial effects produced are as follows:

[0013] 1. The second rotating wheel can deflect radially during rotation to form a flexible contact with the workpiece roller. During the period when the first pressing wheel, the second pressing wheel and the third pressing wheel gradually approach the workpiece roller but have not reached the final position, the cylindrical wall of the workpiece roller formed is evenly pressed without wrinkles.

[0014] 2. The abutment of the supporting roller against the second roller enables the second roller to have a fixed radial deflection amplitude under pressure, thereby ensuring the consistency of the shape of the workpiece roller shrinkage forming.

[0015] 3. By changing the second rotating wheel with different thicknesses or adjusting the position of the supporting rotating wheel to change the radial deflection amplitude of the second rotating wheel, the shape of the workpiece roller shrinkage can be adjusted, and the process is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of the necking machine of the present invention;

[0017] Figure 2 It is an enlarged schematic diagram of the first rotary wheel and its driving part in the necking machine of the present invention;

[0018] Figure 3 It is an enlarged schematic diagram of the second rotary wheel, the third rotary wheel and the supporting rotary wheel and the driving part thereof in the necking machine of the present invention;

[0019] Figure 4 It is a schematic diagram of the state of the necking machine of the present invention before the necking forming of the workpiece roller is performed;

[0020] Figure 5 It is a top view schematic diagram of the supporting rotary wheel in the necking machine of the present invention;

[0021] Figure 6 It is a schematic diagram of the state of the necking machine of the present invention when performing necking forming of a workpiece roller;

[0022] Figure 7 It is a top view schematic diagram of the necking machine of the present invention when performing necking forming of a workpiece roller.

[0023] Figure numerals: 10-machine base; 20-machine frame; 21-first oil cylinder; 210-first oil cylinder piston rod; 211-first roller frame; 212-first roller shaft; 22-second oil cylinder; 220-second oil cylinder piston rod; 221-second roller frame; 222-second roller shaft; 223-supporting roller frame; 224-supporting roller shaft; 30-tensioning device; 31-chuck; 32-claw; 40-motor; 50-workpiece roller; 61-first roller; 611-upper end of the first roller; 612-lower end of the first roller; 62-second roller; 621-inner circumference of the second roller; 622-outer circumference of the second roller; 63-third roller; 631-upper end of the third roller; 632-lower end of the third roller; 64-supporting roller. DETAILED DESCRIPTION

[0024] The present invention provides a spinning shrinking machine for processing a drum of a drum dryer, which is applied to the shrinking forming process of a workpiece drum 50 of a washing machine, a dryer or a dehydrator, such as Figure 1 As shown, it includes a machine base 10, a frame 20, a tensioning device 30, a motor 40 and a transmission mechanism, and a first rotating wheel 61, a second rotating wheel 62 and a third rotating wheel 63 for shrinking the workpiece roller 50.

[0025] The tensioning device 30 is fixedly mounted on the machine base 10, and includes a chuck 31 and claws 32. The claws 32 are evenly distributed on the outer periphery of the chuck 31, and can move in a radial direction of the chuck 31. The extended claws 32 tighten and position the workpiece roller 50 from the inner side of the workpiece roller 50. The chuck 31 is driven by the motor 40 to rotate around the axis, driving the workpiece roller 50 tightened and fixed on the claws 32 to rotate.

[0026] like Figure 2 As shown, the frame 20 is installed on the base 10 in a liftable manner and is located above the tensioning device 30. A first oil cylinder 21 is fixedly installed at the right end of the frame 20, and a piston rod 210 of the first oil cylinder 21 is fixedly connected to a first rotating wheel frame 211, and a first rotating wheel shaft 212 is fixedly installed on the first rotating wheel frame 211. The first rotating wheel 61 is sleeved on the first rotating wheel shaft 212, and can rotate around the first rotating wheel shaft 212 as an axis, and can translate left and right under the drive of the first oil cylinder 21.

[0027] like Figure 3 As shown, a second oil cylinder 22 is fixedly installed at the left end of the frame 20, a piston rod 220 of the second oil cylinder 22 is fixedly connected to a second roller frame 221, a second roller shaft 222 is fixedly installed on the second roller frame 221, a second roller 62 and a third roller 63 are stacked up and down and concentrically sleeved on the second roller shaft 222, an inner circumference 621 of the second roller 62 is at a certain distance from the second roller shaft 222, that is, the inner diameter of the second roller 62 is greater than the outer diameter of the second roller shaft 222, so that the second roller 62 can have a certain radial deflection relative to the second roller shaft 222 when rotating, and the amplitude of the radial deflection is equal to the difference between the inner diameter of the second roller 62 and the outer diameter of the second roller shaft 222. The third roller 63 rotates with the second roller shaft 222 as the axis, and the second roller 62 and the third roller 63 can translate left and right at the same time under the drive of the second oil cylinder 22. The first rotating wheel 61, the second rotating wheel 62 and the third rotating wheel 63 can be moved to the vicinity of the cylindrical wall of the workpiece drum 50 as the random frame 20 descends, and the first rotating wheel 61 is located outside the workpiece drum 50, and the second rotating wheel 62 and the third rotating wheel 63 are located inside the workpiece drum 50. The axes of the workpiece drum 50, the first rotating wheel 61, the second rotating wheel 62 and the third rotating wheel 63 are kept parallel to each other on the same vertical plane.

[0028] Among them, Figure 4 As shown, the outer circumference of the first rotating wheel 61 includes a first upper end 611 and a first lower end 612, the outer diameter of the first upper end 611 remains unchanged, and the outer diameter of the first lower end 612 gradually narrows. The outer diameter of the outer circumference 622 of the second rotating wheel 62 remains unchanged, and the outer circumference of the third rotating wheel 63 also includes a second upper end 631 and a second lower end 632, the outer diameter of the second upper end 631 gradually expands, and the outer diameter of the second lower end 632 remains unchanged. The first upper end 611 of the first rotating wheel 61 and the outer circumference 622 of the second rotating wheel 62 are arranged opposite to each other across the workpiece roller 50, the first lower end 612 of the first rotating wheel 61 and the second upper end 631 of the third rotating wheel 63 are arranged opposite to each other across the workpiece roller 50, and the outer diameter difference between the first upper end 611 and the first lower end 612 of the first rotating wheel 61 is equal to the outer diameter difference between the second upper end 631 and the second lower end 632 of the third rotating wheel 63.

[0029] like Figure 3 As shown, the piston rod 220 of the second oil cylinder 22 is also fixedly mounted with a pair of supporting wheel frames 223, and the pair of supporting wheel frames 223 are respectively fixedly mounted with supporting wheel shafts 224, and the supporting wheels 64 are respectively mounted on the supporting wheel shafts 224 for fixed axis rotation. Figure 5 As shown, the pair of supporting wheels 64 are mirror-symmetrically arranged on both sides of the second wheel 62 in a vertical plane formed by the axes of the workpiece roller 50, the first wheel 61, the second wheel 62 and the third wheel 63, and abut (also called "butt") the semi-cylindrical surface on the left side of the axis of the second wheel 62 when the second wheel 62 undergoes radial deflection, and the semi-cylindrical surface on the right side of the axis of the second wheel 62 is tangent to the cylindrical surface of the inner wall of the workpiece roller 50.

[0030] The following are the main working steps of the necking machine:

[0031] like Figure 4 As shown, before the workpiece roller 50 is subjected to shrinkage forming, the frame 20 descends to drive the first rotating wheel 61, the second rotating wheel 62 and the third rotating wheel 63 to move horizontally to the vicinity of the workpiece roller 50, the first rotating wheel 61 is close to the workpiece roller 50 but does not contact it, the outer peripheral surface 622 of the second rotating wheel 62 and the second lower end portion 632 of the third rotating wheel 63 are level and just in contact with the cylindrical wall of the workpiece roller 50.

[0032] like Figure 6 and Figure 7As shown, when the workpiece roller 50 is subjected to shrinking forming, the first roller 61, the second roller 62 and the third roller 63 simultaneously move toward the workpiece roller 50 along the vertical plane and clamp the workpiece roller 50 from both sides. The second roller 62 deflects to the left under the pressure of the first upper end 611 of the first roller 61, and the amplitude of the deflection is equal to the difference in outer diameter between the second upper end 631 and the second lower end 632 of the third roller 63, so that the rightmost wall of the inner circumference 621 of the second roller 62 abuts against the second roller shaft 222, and the outer circumference 622 of the second roller 62 is smoothly connected with the second upper end 631 of the third roller 63. At this time, the outer circumference of the first roller 61 indirectly abuts against the outer circumference 622 of the second roller 62 and the second upper end 631 of the third roller 63 through the workpiece roller 50, and the cylindrical wall of the workpiece roller 50 completes the shrinking deformation with the contour of the indirect abutment as the generatrix shape.

[0033] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "axis", "up", "down", "left", "right", "inside", "outside", etc. are based on the relative orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] Although specific embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A spinning shrinking machine for processing a drum of a tumble dryer, comprising: A tensioning device (30) for positioning a workpiece roller (50), a motor (40) and a transmission structure for driving the workpiece roller (50) to rotate, and a rotary wheel for rotating the workpiece roller (50) to form a compression opening; characterized in that: The axes of the workpiece roller (50), the first rotating wheel (61), the second rotating wheel (62) and the third rotating wheel (63) are parallel to each other in the same vertical plane; the first rotating wheel (61) is fixedly rotatably fitted on the first rotating wheel shaft (212) and is positioned on the outside of the workpiece roller (50); the second rotating wheel (62) and the third rotating wheel (63) are stacked and sleeved on the second rotating wheel shaft (222) and are positioned on the inside of the workpiece roller (50); the inner diameter of the second rotating wheel (62) is larger than the outer diameter of the second rotating wheel shaft (222), so that the second rotating wheel (62) deflects radially around the second rotating wheel shaft (222) under the pressure of the first rotating wheel (61); the third rotating wheel (63) is fixedly rotatably fitted on the second rotating wheel shaft (222); A first rotary wheel (61) that moves in translation under the drive of a first oil cylinder (21), and a second rotary wheel (62) and a third rotary wheel (63) that move in translation under the drive of a second oil cylinder (22) apply pressure to the cylindrical wall of a workpiece roller (50) from both sides thereof, thereby achieving shrinkage forming of the workpiece roller (50); The outer circumference of the first rotating wheel (61) includes a first upper end portion (611) and a first lower end portion (612), the outer diameter of the first upper end portion (611) remains unchanged, and the outer diameter of the first lower end portion (612) gradually narrows; the outer circumference of the third rotating wheel (63) includes a second upper end portion (631) and a second lower end portion (632), the outer diameter of the second upper end portion (631) gradually expands, and the outer diameter of the second lower end portion (632) remains unchanged; The first upper end (611) of the first rotating wheel (61) and the outer peripheral surface (622) of the second rotating wheel (62) are indirectly abutted via the workpiece roller (50), and the first lower end (612) of the first rotating wheel (61) and the second upper end (631) of the third rotating wheel (63) are indirectly abutted via the workpiece roller (50), and the workpiece roller (50) completes the shrinking deformation with the two indirectly abutted contours as the generatrix shape.

2. The necking machine according to claim 1, characterized in that: The shrinking machine also includes a pair of supporting wheels (64), which are arranged in mirror symmetry with respect to the vertical plane, and abut against the left semi-cylindrical surface of the axis of the second wheel (62) when the second wheel (62) deflects radially, and the right semi-cylindrical surface of the axis of the second wheel (62) is tangent to the cylindrical surface of the inner wall of the workpiece roller (50).

3. The necking machine according to claim 1, characterized in that: The tensioning device (30) comprises a chuck (31) and claws (32); the claws (32) are evenly distributed on the outer periphery of the chuck (31) and can be extended and retracted along the radial direction of the chuck (31); the extended claws (32) tension and position the workpiece roller (50) from the inner side of the workpiece roller (50); the chuck (31) is driven to rotate by a motor (40), thereby driving the workpiece roller (50) to rotate.

4. The necking machine according to claim 1, characterized in that: The necking machine further comprises a frame (20) capable of lifting and lowering above the workpiece roller (50); the frame (20) is fixedly mounted with a first oil cylinder (21) and a second oil cylinder (22); the piston rod (210) of the first oil cylinder (21) is fixedly mounted with a first rotating wheel frame (211), and the first rotating wheel frame (211) is fixedly mounted with a first rotating wheel shaft (212); the piston rod (220) of the second oil cylinder (22) is fixedly mounted with a second rotating wheel frame (221), and the second rotating wheel frame (221) is fixedly mounted with a second rotating wheel shaft (222); the first oil cylinder (21) and the second oil cylinder (22) are arranged in a manner such that the extending directions of the piston rod (210) of the first oil cylinder (21) and the piston rod (220) of the second oil cylinder (22) are opposite to each other.

5. The necking machine according to claim 2, characterized in that: The piston rod (220) of the second oil cylinder (22) is also fixedly mounted with a pair of supporting roller frames (223), and the pair of supporting roller frames (223) are respectively fixedly mounted with supporting roller shafts (224), and the pair of supporting rollers (64) are respectively mounted on the pair of supporting roller shafts (224) in a fixed axis rotatable manner.

6. The necking machine according to claim 1, characterized in that: The difference in outer diameters between the first upper end (611) and the first lower end (612) of the first roller (61) and the difference in outer diameters between the second upper end (631) and the second lower end (632) of the third roller (63) are equal to the difference in inner diameter of the second roller (62) and the outer diameter of the second roller shaft (222).

7. The necking machine according to claim 6, characterized in that: The outer diameter of the outer peripheral surface (622) of the second rotating wheel (62) remains unchanged, and the amplitude of the radial deflection is equal to the difference between the inner diameter of the second rotating wheel (62) and the outer diameter of the second rotating wheel shaft (222).

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