Skin stretching device

Abstract

The utility model discloses a skin stretching device, and relates to the technical field of metal plate processing. The device comprises a rack, a lifting assembly is arranged in the middle of the rack and comprises a workbench and a lifting driving device connected to the bottom of the workbench, the lifting driving device is used for driving the workbench to longitudinally move relative to the rack, a bending die holder with the top being an arc-shaped face is arranged on the workbench, and the portions, located on the two sides of the workbench, of the rack are each provided with a sliding table. The bottom of each sliding table is connected with a horizontal driving device installed on the machine frame, the horizontal driving devices are used for driving the sliding tables to transversely move relative to the machine frame, the sliding tables are provided with stretching assemblies used for stretching the skin workpieces, the stretching assemblies comprise belt pulling mechanisms and clamp mechanisms, and the clamp mechanisms are located above the belt pulling mechanisms. According to the skin stretching device, the corresponding stretching structure can be selected and used according to the thickness and the stretch-bending amplitude of the skin workpiece, and the skin stretching device is suitable for machining skin workpieces with different thicknesses and stretch-bending amplitudes.

Description

Technical Field

[0001] This utility model relates to the field of metal plate processing technology, and in particular to a skin stretching device. Background Technology

[0002] Skin stretching machines are used to stretch metal sheets and other skin materials into the required shape. During the stretching process, the skin material needs to be stretched gradually along the arc surface of the mold until it completely fits the mold to form a specific curved shape. It is mainly used to manufacture large thin-walled parts such as aircraft skin, automobile body panels, and metal sheets in the construction industry.

[0003] For example, Chinese patent CN106694656A discloses a curved surface drawing machine, including a frame, a movable worktable in the middle of the frame, a positioning mold on the movable worktable with an arc surface on its upper surface, a lifting drive device connected below the movable worktable to drive the movable worktable to move longitudinally relative to the frame, sliding platforms on both sides of the movable worktable, and a belt-pulling hydraulic cylinder device on the sliding platform with a belt having a free end connected to the positioning mold. The sliding platforms move left and right on the frame under the drive of the horizontal drive device. This equipment can form specific curved shapes on skinned workpieces. However, this equipment can only stretch and compress skinned workpieces by using the belt-pulling hydraulic cylinder device in conjunction with the movable worktable. Because the belt-pulling hydraulic cylinder device exerts a relatively uniform and gentle force on the workpiece, it is only suitable for processing thinner skinned workpieces with a large bending amplitude, and not suitable for processing thicker, higher-strength skinned workpieces. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a skin stretching device, which can select the appropriate stretching structure according to the thickness and bending amplitude of the skin workpiece, and is suitable for processing skin workpieces with different thicknesses and bending amplitudes.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A skin stretching device includes a frame with a lifting assembly in the middle. The lifting assembly includes a worktable and a lifting drive device connected to the bottom of the worktable. The lifting drive device is used to drive the worktable to move longitudinally relative to the frame. The worktable is provided with a bending die base with an arc-shaped top. A set of slides is provided on both sides of the worktable on the frame. The bottom of each set of slides is connected to a horizontal drive device mounted on the frame. The horizontal drive device is used to drive the slides to move laterally relative to the frame. The slides are provided with a stretching assembly for stretching the skin workpiece. The stretching assembly includes a strapping mechanism and a clamping mechanism, with the clamping mechanism located above the strapping mechanism.

[0007] In some embodiments, a first fixed seat is provided on the slide table; the belt pulling mechanism includes a plurality of first hydraulic cylinders arranged at intervals and a plurality of belts, the first hydraulic cylinders are mounted on the first fixed seat, the piston rod of each first hydraulic cylinder is provided with a connecting ring at the front end, and the two ends of each belt are respectively connected to the connecting rings of two opposite first hydraulic cylinders located on two sets of slide tables, and the belts are used to abut against the upper surface of the skinned workpiece; a channel support frame is provided at one end of the slide table near the worktable, the channel support frame includes a crossbar and a plurality of partitions, the plurality of partitions are arranged at intervals and erected on the worktable, and a belt pulling channel is formed between two adjacent partitions for the belts to pass through, the crossbar passes through each partition in sequence and is fixedly connected to the partition.

[0008] In some embodiments, the first fixing seat includes a first upright plate fixed on the slide table and a plurality of reinforcing ribs fixed at intervals between the first upright plate and the slide table. The reinforcing ribs can improve the structural strength and structural stability of the first fixing seat.

[0009] In some embodiments, the channel support frame is provided with a second fixed seat, and the second fixed seat is provided with a plurality of first hinge seats arranged at intervals; the clamping mechanism includes a plurality of clamp frames, and the clamp frames are provided with second hinge seats that are hinged to the first hinge seats. A mounting plate is fixed in the middle of the clamp frame, and a second hydraulic cylinder is mounted on the mounting plate. The piston rod of the second hydraulic cylinder passes through the mounting plate and is connected to a push-pull plate. The push-pull plate is provided with an upper clamp and a lower clamp that can move longitudinally. A pad is provided on the opposite surface of the upper clamp and the lower clamp. The upper and lower parts of the clamp frame are provided with slide seats, and the slide seats are provided with inclined T-shaped slide grooves. The upper clamp and the lower clamp are provided with T-shaped slide rails that are adapted to the T-shaped slide grooves. The T-shaped slide rails are slidably connected to the T-shaped slide grooves. The second hydraulic cylinder is used to drive the push-pull plate to drive the upper clamp and the lower clamp to reciprocate to clamp the skinned workpiece.

[0010] In some embodiments, the second fixing base includes a first horizontal plate, a second horizontal plate, and a second vertical plate. The first horizontal plate is fixed on the channel support frame, the second horizontal plate is parallel to the top of the first horizontal plate, and the second vertical plate is fixedly connected between the first horizontal plate and the second horizontal plate to ensure the structural strength and structural stability of the second fixing base.

[0011] Compared with the prior art, this utility model achieves at least the following beneficial effects:

[0012] The belt pulling mechanism and the clamping mechanism can be used separately. The belt pulling mechanism or the clamping mechanism is selected according to the thickness of the skin workpiece and the bending range. When the skin workpiece is thin and the bending range is large, the belt pulling mechanism is used in conjunction with the bending die to stretch the skin workpiece. When the skin workpiece is thick and the bending range is small, the clamping mechanism above the belt pulling mechanism is used in conjunction with the bending die to stretch the skin workpiece. One machine can be used to process skin workpieces of different thicknesses and bending ranges. Attached Figure Description

[0013] One or more embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which:

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0015] Figure 2 This is a first-view structural schematic diagram of the slide table according to an embodiment of this application;

[0016] Figure 3 This is a structural schematic diagram of the slide table from a second perspective according to an embodiment of this application;

[0017] Figure 4 This is a third-view structural schematic diagram of the slide table according to an embodiment of this application;

[0018] Figure 5 This is a front view of the clamping mechanism according to an embodiment of this application;

[0019] Figure 6 This is an exploded structural diagram of the clamping mechanism according to an embodiment of this application.

[0020] The diagram is labeled as follows: 1. Frame; 2. Lifting assembly; 21. Workbench; 22. Lifting drive device; 3. Slide table; 31. Right-angle guide block; 32. Reinforcing block; 4. Horizontal drive device; 5. Belt pulling mechanism; 51. First hydraulic cylinder; 511. Connecting ring; 6. Clamping mechanism; 61. Clamping frame; 611. Second hinge seat; 62. Mounting plate; 63. Second hydraulic cylinder; 64. Push-pull plate; 65. Upper clamp; 66. Lower clamp; 67. Pad block; 68. Slide seat; 69. T-shaped slide groove; 610. T-shaped slide rail; 7. First fixed seat; 71. First upright plate; 72. Reinforcing rib plate; 8. Channel support frame; 81. Crossbar; 82. Partition plate; 821. Belt pulling channel; 9. Second fixed seat; 91. First horizontal plate; 92. Second horizontal plate; 93. Second upright plate; 10. First hinge seat. Detailed Implementation

[0021] The present invention will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of this application more complete and to fully convey the concept of the present application to those skilled in the art.

[0022] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] like Figures 1-6As shown in the embodiment of this application, a skin stretching device includes a frame 1. A lifting assembly 2 is provided in the middle of the frame 1. The lifting assembly 2 includes a worktable 21 and a lifting drive device 22 connected to the bottom of the worktable 21. The lifting drive device 22 is used to drive the worktable 21 to move longitudinally relative to the frame 1. A bending die seat (not shown in the figure) with an arc-shaped top is provided on the worktable 21. The bending die seat is used to bend the skin workpiece according to a preset angle and shape to ensure that the corresponding part of the skin workpiece reaches the required shape. A set of slides 3 is provided on both sides of the worktable 21 on the frame 1. A horizontal drive device 4 installed on the frame 1 is connected to the bottom of each set of slides 3. The horizontal drive device 4 is used to drive the slides 3 to move laterally relative to the frame 1. The two sets of slides 3 can move in opposite directions and towards each other. A stretching assembly for stretching the skin workpiece is provided on the slides 3. The stretching assembly includes a strapping mechanism 5 and a clamping mechanism 6. The clamping mechanism 6 is located above the strapping mechanism 5. It should be noted that the belt pulling mechanism 5 and the clamping mechanism 6 can be used independently. The belt pulling mechanism 5 or the clamping mechanism 6 can be selected according to the thickness of the skin workpiece and the bending range. When the skin workpiece is thin and the bending range is large, the belt pulling mechanism 5 is used in conjunction with the bending die to stretch the skin workpiece. When the skin workpiece is thick and the bending range is small, the clamping mechanism 6 is used in conjunction with the bending die to stretch the skin workpiece.

[0024] Specifically, the slide table 3 is provided with a first fixed seat 7; the belt pulling mechanism 5 includes several first hydraulic cylinders 51 arranged at intervals and several belts. The first hydraulic cylinders 51 are mounted on the first fixed seat 7. The piston rod of each first hydraulic cylinder 51 is provided with a connecting ring 511 at its front end. The two ends of each belt are respectively connected to the connecting rings 511 of two opposite first hydraulic cylinders 51 located on two sets of slide tables 3. The belts are used to abut against the upper surface of the skin workpiece, so that the skin workpiece is close to the arc surface of the bending die seat. The slide table 3 is provided with a channel support frame 8 near the worktable 21. The channel support frame 8 includes a crossbar 81 and several partitions 82. The partitions 82 are arranged at intervals and are erected and fixed on the worktable 21. A belt pulling channel 821 for the belt to pass through is formed between two adjacent partitions 82. The crossbar 81 passes through each partition 82 in sequence and is fixedly connected to the partition 82.

[0025] Optionally, the first fixed seat 7 includes a first upright plate 71 that is erected and fixed on the slide table 3, and a number of reinforcing ribs 72 that are fixed at intervals between the first upright plate 71 and the slide table 3. The reinforcing ribs 72 can improve the structural strength and structural stability of the first fixed seat 7 and ensure that the first oil cylinder 51 works smoothly.

[0026] The channel support frame 8 is provided with a second fixed seat 9, and the second fixed seat 9 is provided with a plurality of first hinge seats 10 arranged at intervals; the clamping mechanism 6 includes a plurality of clamp frames 61, and the clamp frame 61 is provided with a second hinge seat 611 that is hinged to the first hinge seat 10. A mounting plate 62 is fixed in the middle of the clamp frame 61, and a second hydraulic cylinder 63 is mounted on the mounting plate 62. The piston rod of the second hydraulic cylinder 63 passes through the mounting plate 62 and is connected to a push-pull plate 64. The push-pull plate 64 is provided with an upper clamp 65 and a lower clamp 66 that can move longitudinally. In this embodiment, two sets of oblong holes are provided on the push-pull plate 64, one upper and one lower. Screw holes corresponding to the two sets of oblong holes are provided on the upper clamp 65 and the lower clamp 66, respectively. Thus, the upper clamp 65 and the lower clamp 66 can be connected to the oblong holes by mounting screws. It should be noted that the screws and oblong holes are not locked together to ensure that the upper clamp 65 and the lower clamp 66 are connected to the oblong holes by mounting screws. The upper clamp 65 and lower clamp 66 can move longitudinally along the oblong hole; pads 67 are provided on the opposite surfaces of the upper clamp 65 and lower clamp 66; the upper and lower parts of the clamp frame 61 are provided with slides 68, and the slides 68 are provided with inclined T-shaped grooves 69; the upper clamp 65 and lower clamp 66 are provided with T-shaped slide rails 610 that are adapted to the T-shaped slide rails 69; the T-shaped slide rails 610 are slidably connected to the T-shaped slide rails 69, thereby allowing the upper clamp 65 and lower clamp 66 to move longitudinally along the oblong hole. The upper clamp 65 and lower clamp 66 can slide obliquely along the T-shaped slide groove 69. The second hydraulic cylinder 63 drives the push-pull plate 64 to reciprocate the upper clamp 65 and lower clamp 66. When the upper clamp 65 and lower clamp 66 approach each other, they can clamp the skinned workpiece. When the upper clamp 65 and lower clamp 66 move away from each other, they can release the skin. The clamping force of the upper clamp 65 and lower clamp 66 can be adjusted by the second hydraulic cylinder 63 to ensure stable clamping without damaging the skin. The upper clamp 65 and lower clamp 66 can be made of alloy steel, stainless steel, aluminum alloy, etc., depending on the type of skin. Among them, alloy steel clamps have high strength and are suitable for heavy-duty skins, stainless steel clamps are corrosion-resistant and suitable for humid environments, and aluminum alloy clamps are lightweight and suitable for light-duty skins.

[0027] Optionally, the second fixed base 9 includes a first horizontal plate 91, a second horizontal plate 92, and a second vertical plate 93. The first horizontal plate 91 is fixed on the channel support frame 8, the second horizontal plate 92 is parallel to the top of the first horizontal plate 91, and the second vertical plate 93 is fixedly connected between the first horizontal plate 91 and the second horizontal plate 92, thereby improving the structural strength and stability of the second fixed base 9 and ensuring that the clamping mechanism 6 works smoothly.

[0028] In addition, the bottom of the slide table 3 is fixed with several right-angle guide blocks 31 that are slidably connected to the front and rear edges of the frame 1, and several reinforcing blocks 32 that are slidably connected to the top of the frame 1, so as to ensure the motion accuracy and stability of the slide table 3.

[0029] Optionally, both the lifting drive device 22 and the horizontal drive device 4 are hydraulic cylinders.

[0030] When using this skin stretching device, the skin workpiece to be processed is placed on the bending die base of the worktable 21. When the bending range of the skin workpiece is large, the stretching mechanism 5 is used to stretch the skin workpiece. The stretching belt abuts against the upper surface of the skin workpiece, making the skin workpiece adhere tightly to the bending die base. The two ends of the stretching belt pass through the stretching belt channels 821 on both sides and are connected to the connecting rings 511 of the two opposing first hydraulic cylinders 51. At this time, the two horizontal drive devices 4 drive the two sets of slides 3 to move outward away from the worktable 21, while the lifting drive device 22 drives the worktable 21 and the bending die base to move upward, thereby realizing the large-range bending process of the skin workpiece and adjusting the stretching of the skin workpiece in the longitudinal and transverse directions, thus making the skin... The workpiece is formed into a curved surface on the bending die, satisfying various complex curved surface forming requirements. When the bending amplitude of the workpiece is small, a clamping mechanism 6 is used to stretch the workpiece. The clamping mechanisms 6 on both sides hold the two sides of the workpiece. At this time, two horizontal drive devices 4 drive two sets of slides 3 to move outward away from the worktable 21. During this process, the clamp frame 61 can also rotate around the first hinge seat 10 at a certain angle along with the workpiece. At the same time, the lifting drive device 22 drives the worktable 21 and the bending die to move upward, thereby realizing the small-amplitude bending process of the workpiece and adjusting the stretching of the workpiece in the longitudinal and transverse directions, so that the workpiece forms a curved surface on the bending die. During the stretching process of the workpiece, the movement speed of the slides 3 is adjusted by the horizontal drive device 4 as needed to ensure that the workpiece is stretched evenly and flat.

[0031] It should be understood that all the above embodiments are exemplary and not restrictive. Any modifications, equivalent changes and alterations made by those skilled in the art to the specific embodiments described above under the concept of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A skin stretching device, comprising a frame, characterized in that: The frame has a lifting assembly in the middle, which includes a worktable and a lifting drive device connected to the bottom of the worktable. The lifting drive device is used to drive the worktable to move longitudinally relative to the frame. The worktable is provided with a bending die base with an arc-shaped top. A set of slides is provided on both sides of the worktable on the frame. The bottom of each set of slides is connected to a horizontal drive device installed on the frame. The horizontal drive device is used to drive the slide to move laterally relative to the frame. The slide is provided with a stretching assembly for stretching the skinned workpiece. The stretching assembly includes a strapping mechanism and a clamping mechanism. The clamping mechanism is located above the strapping mechanism.

2. The skin stretching device according to claim 1, characterized in that: The slide is provided with a first fixed seat; the belt pulling mechanism includes a number of first hydraulic cylinders arranged at intervals and a number of belts. The first hydraulic cylinders are mounted on the first fixed seat. The piston rod of each first hydraulic cylinder is provided with a connecting ring at its front end. The two ends of each belt are respectively connected to the connecting rings of two opposite first hydraulic cylinders located on two sets of slides, and the belts are used to abut against the upper surface of the skinned workpiece. A channel support frame is provided at one end of the slide near the worktable. The channel support frame includes a crossbar and a number of partitions. The partitions are arranged at intervals and are erected and fixed on the worktable. A belt pulling channel is formed between two adjacent partitions for the belts to pass through. The crossbar passes through each partition in sequence and is fixedly connected to the partition.

3. The skin stretching device according to claim 2, characterized in that: The first fixed base includes a first upright plate that is erected and fixed on the slide table, and a number of reinforcing ribs that are fixed at intervals between the first upright plate and the slide table.

4. The skin stretching device according to claim 2, characterized in that: The channel support frame is provided with a second fixed seat, and the second fixed seat is provided with a plurality of first hinge seats arranged at intervals; the clamping mechanism includes a plurality of clamp frames, and the clamp frames are provided with second hinge seats that are hinged to the first hinge seats. A mounting plate is fixed in the middle of the clamp frame, and a second hydraulic cylinder is mounted on the mounting plate. The piston rod of the second hydraulic cylinder passes through the mounting plate and is connected to a push-pull plate. The push-pull plate is provided with an upper clamp and a lower clamp that can move longitudinally. A pad is provided on the opposite surface of the upper clamp and the lower clamp. The upper and lower parts of the clamp frame are provided with slide seats, and the slide seats are provided with inclined T-shaped slide grooves. The upper clamp and the lower clamp are provided with T-shaped slide rails that are adapted to the T-shaped slide grooves. The T-shaped slide rails are slidably connected to the T-shaped slide grooves. The second hydraulic cylinder is used to drive the push-pull plate to drive the upper clamp and the lower clamp to reciprocate to clamp the skinned workpiece.

5. The skin stretching device according to claim 4, characterized in that: The second fixed base includes a first horizontal plate, a second horizontal plate, and a second vertical plate. The first horizontal plate is fixed on the channel support frame, the second horizontal plate is parallel to the top of the first horizontal plate, and the second vertical plate is fixedly connected between the first horizontal plate and the second horizontal plate.

6. The skin stretching device according to claim 1, characterized in that: The bottom of the slide table is fixed with several right-angle guide blocks that are slidably connected to the front and rear edges of the frame.

7. The skin stretching device according to claim 6, characterized in that: The bottom of the slide is also fixed with several reinforcing blocks that are slidably connected to the top of the frame.

8. The skin stretching device according to claim 1, characterized in that: Both the lifting drive device and the horizontal drive device use hydraulic cylinders.

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