Aluminum alloy plate stretching device

Abstract

The invention provides an aluminum alloy plate stretching device, and particularly relates to the technical field of aluminum alloy plate stretching machining, the aluminum alloy plate stretching device comprises a stretching table, and a first hydraulic cylinder and a second hydraulic cylinder which are symmetrically arranged on two sides of the top surface of the stretching table, and one side, far away from a small hydraulic cylinder, of a pressing block is slidably arranged on an inclined surface of an inclined surface block; by means of the linear positioning mechanism, pulling force can be dispersed to a plurality of contact points through multi-point equidistant clamping, stress distribution of a plate is closer to a linear uniform state, local concentration of stress in stretching operation is prevented, stress distribution is more uniform, and the tensile strength of the plate is improved. The risk that the aluminum alloy plate is scrapped due to local stress concentration is effectively reduced, meanwhile, a heat dissipation path is increased through multi-point equidistant clamping, heat transfer is accelerated, meanwhile, local temperature concentration can be reduced through scattered layout of clamping points, and the internal stress of the aluminum alloy plate can be evenly eliminated.

Description

Technical Field

[0001] The invention provides an aluminum alloy plate stretching device, and particularly relates to the technical field of aluminum alloy plate stretching processing. Background Art

[0002] Aluminum alloy sheet stretching equipment, also known as stretching and straightening machines, is primarily used to stretch and flatten aluminum alloy sheets, rounds, and other materials to achieve specific shapes, dimensions, and performance requirements. Aluminum alloy sheet stretching is widely used in the production of high-strength aluminum alloy forgings (especially aluminum alloy sheet) for automotive and aerospace applications.

[0003] Patent publication number CN214813986U discloses a stretching mechanism for aluminum alloy parts used in the production of automotive parts. It fixes one end of the aluminum alloy sheet by interlocking two pressure plates. Since two sets of pressure plates are symmetrically arranged, the other end can also be fixed between the two pressure plates using the same principle, thereby preventing the sheet from falling off during the stretching process.

[0004] However, existing technologies still have shortcomings: because existing technologies generally use single-point or surface contact for clamping and positioning, when single-point clamping is used, stress is concentrated at the contact point in the middle of the two ends of the plate, which can easily lead to excessive local stress, causing micro cracks and deformation in the plate (this is particularly significant for thin-walled, high-toughness aluminum alloy profiles used in aerospace). Surface contact methods not only make it difficult to ensure the balance and stability of the clamping force, but also, due to the large clamping coverage area, affect the heat dissipation of the aluminum alloy plate, resulting in poor stress release in the aluminum alloy plate. Therefore, the present invention proposes an aluminum alloy sheet stretching device to improve the shortcomings of the prior art. Summary of the Invention

[0005] In view of the defects existing in the prior art, the present invention provides an aluminum alloy plate stretching device, which can effectively solve the relevant technical problems raised by the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention discloses an aluminum alloy plate stretching device, comprising a stretching platform, and a first hydraulic cylinder and a second hydraulic cylinder symmetrically arranged on both sides of the top surface of the stretching platform. A main controller is installed on one side of the top of the stretching platform, and a linear positioning mechanism is arranged between the piston rods of the first hydraulic cylinder and the second hydraulic cylinder. It includes a positioning structure and an adjustment structure; The positioning structure includes two concave plates fixedly connected to the ends of the piston rods of the first hydraulic cylinder and the second hydraulic cylinder, respectively. An array rod is provided on each side of the two concave plates close to each other, and an even number of hole plates equidistantly distributed in the horizontal direction are slidably provided on the array rod; A clamping structure is fixedly provided on one side of each hole plate away from the concave plate; It includes a positioning plate fixedly connected to the side of each orifice plate away from the concave plate, a small hydraulic cylinder is fixedly installed in the middle of the positioning plate, the end of the piston rod of the small hydraulic cylinder is fixedly connected to a pressure block, and two inclined plane blocks are symmetrically slidably provided on the side of the positioning plate away from the orifice plate, and the pressure block is slidably provided on the inclined surface of the inclined plane block on the side away from the small hydraulic cylinder, and the two inclined plane blocks are detachably connected to the jaw plate on the side away from the pressure block. The adjusting structure is used to adjust the distance between the clamping structures on two adjacent orifice plates.

[0007] Preferably, the array rod is composed of several cylindrical rods equidistantly distributed in the vertical direction, and each hole plate is provided with a circular hole at a position corresponding to each array rod. Each hole plate is passed through the corresponding circular hole on the corresponding cylindrical rod and can slide along the cylindrical rod.

[0008] Preferably, a T-shaped opening groove is provided on the side of the positioning plate away from the hole plate, and the two inclined blocks are slidably connected to the T-shaped opening groove through the T-shaped parts at their ends. The inclined surfaces of the two inclined blocks are provided with concave slots, and the upper and lower surfaces of the pressing block are provided with protruding blocks that slide in the slots.

[0009] Preferably, sliders are fixedly provided on both sides of the bottom of the two concave plates, and slide rails are fixedly provided on the top of the exhibition stand, and the sliders are slidably matched with the slide rails.

[0010] Preferably, the adjustment structure includes servo electric cylinders fixedly mounted on the sides of the two concave plates away from each other, and a lifting plate is slidingly provided on the sides of the two concave plates close to each other. Two groups of mirror-image bevel grooves are provided on the surface of the lifting plate. The two groups of mirror-image bevel grooves are symmetrically arranged with respect to the central axis of the lifting plate, and each group of mirror-image bevel grooves is composed of an even number of inclined through-grooves. A sliding cam is provided on the top of each orifice plate close to the mirror-image bevel groove, and slides in the corresponding through-groove through the sliding cam.

[0011] Preferably, both sides of the lifting plate are provided with dovetail-shaped parts, and the lifting plate slides in the dovetail grooves on the inner walls of both sides of the concave plate through the dovetail-shaped parts.

[0012] Preferably, a circular limiting portion is provided at the end portion of the sliding convex shaft passing through one end of the through groove, and the outer diameter of the circular limiting portion is larger than the outer diameter of the sliding convex shaft.

[0013] Preferably, it also includes a pushing mechanism arranged on the stretching platform, which includes two support plates symmetrically fixed on the stretching platform, both support plates are rotatably connected with a screw rod, a nut sleeve block is provided on the threaded sleeve of the screw rod, the bottom of the nut sleeve block is slidably arranged in a horizontal groove on the support plate through a sliding protrusion, and an L-shaped plate is fixedly provided on the top of the nut sleeve block, the top of the L-shaped plate has a horizontal plane, and a rectangular protrusion is provided on the side of the horizontal plane away from the support plate, the L-shaped plate is located on both sides of the support shaft, and a synchronization component is transmission-connected between the ends of the two screw rods, the synchronization component is a chain drive or a pulley drive, and a pin is provided on the side of the synchronization component away from the screw rod, and the pin is connected to the machine shaft of the external drive motor to realize rotational power transmission.

[0014] Preferably, a plurality of supporting shafts are rotatably arranged on the top of the exhibition stand and between the two concave plates. The supporting shafts are arranged horizontally and equidistantly, and the top surface of each supporting shaft is on the same horizontal line as the top surface of the jaw plate below.

[0015] Preferably, a rotating rod is rotatably connected to one side of the top of the exhibition stand near the pin shaft, and a cotton sleeve is provided on the outside of the rotating rod. When the aluminum alloy plate is placed horizontally on the top surface of the L-shaped plate, the top surface of the aluminum alloy plate is in contact with the bottom of the cotton sleeve.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: This aluminum alloy sheet stretching device, through the provision of a linear positioning mechanism, utilizes multi-point equidistant clamping to disperse the tensile force to multiple contact points, making the sheet stress distribution closer to a "linear uniform" state, preventing local stress concentration during the stretching operation, making the stress distribution more uniform, and effectively reducing the risk of aluminum alloy sheet being scrapped due to local stress concentration; At the same time, multi-point equidistant clamping improves clamping stability by increasing contact position and friction, combined with the "cooperative locking" of each clamping point, and is suitable for high-speed and high-tension stretching scenarios; In addition, multi-point equidistant clamping increases the heat dissipation path and accelerates heat transfer. At the same time, the "dispersed layout" of the clamping points can reduce local temperature concentration, so that the internal stress of the aluminum alloy plate can be evenly eliminated; The adjustable structure can flexibly adjust the spacing between the clamping structures on adjacent perforated plates according to the width of aluminum alloy plates of different specifications, making the stretching device adaptable to stretching operations of plates of various widths and lengths, broadening the application range of the device, avoiding the need to replace equipment due to differences in plate specifications, and effectively improving equipment utilization; The pushing mechanism uses a ball screw structure with synchronous transmission of the lead screw and the nut sleeve. It can efficiently and stably convert the rotational power of the drive motor into the linear translation motion of the L-shaped plate, ensuring uniform speed and precise positioning of the aluminum alloy plate during the pushing process. It not only eliminates the need for manual pushing, but also avoids the problems of plate deviation and jamming caused by unstable conveying, significantly improving the efficiency and reliability of plate conveying. The support shaft is used to form a spaced support at the bottom of the plate, which disperses the gravity and friction of the plate during the pushing process, avoids deformation of the plate due to excessive local force, protects the surface quality of the plate, and improves the overall quality of the aluminum alloy plate; At the same time, the cotton sleeve and the top surface of the plate generate friction to drive the rotating rod to rotate, and the cotton sleeve is used to absorb and remove impurities attached to the surface of the aluminum alloy plate, which not only ensures the cleanliness of the aluminum alloy plate surface, but also prevents impurities from adhering to and affecting the clamping effect of the clamping structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a main perspective structural diagram of the present invention; Figure 2 It is a partial three-dimensional structural diagram of the slider and the related components of the slide rail in the present invention; Figure 3 It is a partial three-dimensional structural diagram of the positioning structure and the relevant components of the clamping component in the present invention; Figure 4 It is a partial three-dimensional structural diagram of the relevant components of the clamping component in the present invention; Figure 5 A partial three-dimensional structural diagram of the relevant components of the clamping component in the present invention in a cutaway state; Figure 6 It is a partially exploded three-dimensional structural diagram of the clamping component in the present invention; Figure 7 It is a partial three-dimensional structural diagram of the relevant components of the adjustment structure in the present invention; Figure 8 It is a partial three-dimensional structural diagram of the relevant components of the concave plate in the cross-section state of the present invention; Figure 9 It is a partial three-dimensional structural diagram of the relevant components of the pushing mechanism in the present invention; Figure 10 For the present invention Figure 9 A partial enlarged structural diagram in the middle; Figure 11 This is a partial three-dimensional structural diagram of the relevant components of the support plate in the cross-section state of the present invention; Figure 12 It is a partial front structural diagram of the supporting shaft and related components of the L-shaped plate in the present invention.

[0018] The numbers in the figure represent: 1. Pulling platform; 11. First hydraulic cylinder; 12. Second hydraulic cylinder; 13. Main controller; Linear positioning mechanism, including: Positioning structure: 21, concave plate; 2101, slider; 2102, slide rail; 22, array rod; 23, orifice plate; 24, clamping component; 241, positioning plate; 242, small hydraulic cylinder; 243, pressure block; 244, ramp block; 245, jaw plate; Adjustment structure: 25, servo electric cylinder; 26, lifting plate; 27, mirror inclined groove; 28, sliding cam; Pushing mechanism: 31, support shaft; 32, support plate; 33, screw rod; 34, nut sleeve block; 341, L-shaped plate; 35, synchronization component; 36, pin shaft; 37, rotating rod; 371, cotton sleeve. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the embodiments.

[0020] Example 1: like Figures 1 to 6 As shown, an aluminum alloy plate stretching device comprises a stretching platform (1), and a first hydraulic cylinder (11) and a second hydraulic cylinder (12) symmetrically arranged on both sides of the top surface of the stretching platform (1). After the first hydraulic cylinder (11) and the second hydraulic cylinder (12) are activated, they are used to generate horizontal moments moving away from each other to support the tensile and pulling force of the aluminum alloy plate. A main controller (13) is installed on one side of the top of the stretching platform (1); A linear positioning mechanism is provided between the piston rods of the first hydraulic cylinder (11) and the second hydraulic cylinder (12); It includes a positioning structure and an adjustment structure; The positioning structure comprises concave plates (21) respectively fixedly connected to the ends of the piston rods of the first hydraulic cylinder (11) and the second hydraulic cylinder (12), wherein two concave plates (21) are provided in total, and sliders (2101) are fixedly provided on both sides of the bottom of the two concave plates (21), and a slide rail (2102) is fixedly provided on the top of the exhibition stand (1), and the sliders (2101) and the slide rails (2102) are slidably matched, and the stability of the translation of the two concave plates (21) is further ensured by the sliders (2101) and the slide rails (2102). An array rod (22) is provided on each side of the two concave plates (21) close to each other. An even number of hole plates (23) equidistantly distributed in the horizontal direction are slidably provided on the array rod (22). The array rod (22) is composed of a plurality of columnar rods equidistantly distributed in the vertical direction. A circular hole is provided on each hole plate (23) at a position corresponding to each array rod (22). Each hole plate (23) is penetrated on the corresponding columnar rod through the corresponding circular hole and can slide along the columnar rod.

[0021] A clamping structure (24) is fixedly provided on one side of each perforated plate (23) away from the concave plate (21); The invention comprises a positioning plate (241) fixedly connected to the side of each hole plate (23) away from the concave plate (21), a small hydraulic cylinder (242) fixedly installed in the middle of the positioning plate (241), a piston rod end of the small hydraulic cylinder (242) fixedly connected to a pressing block (243), and two inclined plane blocks (244) symmetrically slidingly arranged on the side of the positioning plate (241) away from the hole plate (23), and an inclined plane is provided on the side of the two inclined plane blocks (244) close to each other. The pressing block (243) is slidably arranged on the inclined plane of the inclined plane block (244) on the side away from the small hydraulic cylinder (242), and the inclined planes of the two inclined plane blocks (244) are both provided with an inner concave groove. The upper and lower surfaces of the pressing block (243) are provided with a protruding block sliding in the groove, and the function of the protruding block (243) is to ensure the stability of the pressing block (243) and the inclined plane of the inclined plane block (244) in the extrusion fit. A T-shaped opening groove is provided on the side of the positioning plate (241) away from the hole plate (23). The two inclined plane blocks (244) are slidably connected to the T-shaped opening groove through the T-shaped portion at their ends. The function is to ensure the stability of the inclined plane blocks (244) sliding on the positioning plate (241) and prevent them from separating from the positioning plate (241). The two inclined plane blocks (244) are detachably connected to the jaw plate (245) on the side away from the pressing block (243). Specifically, the jaw plate (245) is threadedly connected to the inclined plane block (244) by bolts.

[0022] When in use: When working, first place the aluminum alloy sheet to be stretched horizontally on each jaw plate (245). Start the small hydraulic cylinder (242) in the middle of the positioning plate (241) on the hole plate (23) to push the pressing block (243), so that the pressing block (243) slides on the inclined surface of the inclined surface block (244). Due to the effect of the inclined surface, the two inclined surface blocks (244) slide relative to each other in the T-shaped opening groove of the positioning plate (241), thereby driving the detachable jaw plate (245) to clamp the two ends of the aluminum alloy sheet. Since the clamping structure (24) is linearly and equidistantly distributed, a multi-point equidistant clamping effect is formed on both sides of the aluminum alloy sheet.

[0023] The main controller (13) then simultaneously activates the first hydraulic cylinder (11) and the second hydraulic cylinder (12), which generate horizontal moments moving away from each other, thereby stretching the aluminum alloy plate to eliminate stress in the aluminum alloy plate.

[0024] Example 2: like Figure 1 、 Figure 7 、 Figure 8 As shown, the aluminum alloy plate stretching device further includes an adjusting structure for adjusting the spacing between the clamping structures (24) on two adjacent perforated plates (23); The adjustment structure includes a servo electric cylinder (25) fixedly mounted on the side of the two concave plates (21) away from each other, and a lifting plate (26) is slidably provided on the side of the two concave plates (21) close to each other. Both sides of the lifting plate (26) are provided with dovetail parts, and the lifting plate slides in the dovetail grooves on the inner walls of both sides of the concave plates (21) through the dovetail parts. The surface of the lifting plate (26) is provided with two groups of mirror-image inclined grooves (27), and the two groups of mirror-image inclined grooves (27) are symmetrically arranged with respect to the central axis of the lifting plate (26), and each group of mirror-image inclined grooves (27) is composed of an even number of inclined through grooves. The top of each hole plate (23) close to the mirror-image inclined groove (27) is provided with a sliding convex shaft (28), and the sliding convex shaft (28) is passed through and slides in the corresponding through groove. The end of the sliding convex shaft (28) passing through one end of the through groove is provided with a circular limiting portion, and the outer diameter of the circular limiting portion is larger than the outer diameter of the sliding convex shaft (28). Its function is to prevent the sliding convex shaft (28) from radially displacing in the through groove.

[0025] When in use: When in use, according to the actual width of the aluminum alloy plate to be stretched, the servo electric cylinder (25) in the adjustment structure is started through the main controller (13). After starting, it will output power to push the lifting plate (26) connected to it to slide on the side of the concave plate (21) that is close to each other. Because the dovetail parts on both sides of the lifting plate (26) match the dovetail grooves on the inner walls of the concave plate (21), the lifting plate (26) slides smoothly and in a fixed direction.

[0026] As the lifting plate (26) slides, the two sets of mirror-image inclined grooves (27) on its surface also move. The sliding cam (28) at the top of each hole plate (23) near the mirror-image inclined groove (27) is inserted into the corresponding through groove. Because the mirror-image inclined groove (27) is composed of an even number of inclined through grooves, when the lifting plate (26) moves, the inclination angle of the through groove will force the sliding cam (28) to move along the direction of the groove. Because the outer diameter of the circular stop portion at the end of the sliding cam (28) is larger than the outer diameter of the sliding cam (28) itself, the sliding cam (28) can only slide along the groove track in the through groove without radial displacement, thereby ensuring the stability and accuracy of the movement.

[0027] In this way, the sliding convex shafts (28) on the adjacent hole-setting plates (23) drive the hole-setting plates (23) to move horizontally along the array rods (22) under the action of the mirror-image inclined grooves (27), thereby realizing the adaptive adjustment of the spacing between the clamping structures (24) on the two adjacent hole-setting plates (23). After the adjustment is completed, the clamping structure (24) can be used to stably clamp aluminum alloy plates of different widths and sizes, and the first hydraulic cylinder (11) and the second hydraulic cylinder (12) can be used to perform stretching operations. The entire process is easy to operate and can quickly adapt to the stretching requirements of plates of various specifications.

[0028] Example 3: like Figure 1 、 Figures 9 to 12 As shown, the aluminum alloy plate stretching device further includes a pushing mechanism arranged on the stretching platform (1), which includes two support plates (32) symmetrically fixedly arranged on the stretching platform (1), and the two support plates (32) are both rotatably connected to a screw rod (33), and a nut sleeve (34) is provided on the screw rod (33). A ball screw structure is formed between the nut sleeve (34) and the screw rod (33) to ensure smoothness and stability of transmission. The bottom of the nut sleeve (34) is slidably arranged in a horizontal groove on the support plate (32) through a sliding protrusion, and the top of the nut sleeve (34) is fixedly provided with an L-shaped plate (341), the top of the L-shaped plate (341) has a horizontal surface, and a rectangular protrusion is provided on the side of the horizontal surface away from the support plate (32). Specifically, the L-shaped plate (341) is made of a high-temperature resistant metal material, such as steel; and when in use, the aluminum alloy plate horizontally contacts the horizontal surface, and one end surface contacts the inner side surface of the rectangular protrusion. The L-shaped plate (341) is located on both sides of the support shaft (31). Its function is to prevent the L-shaped plate (341) from interfering with the support shaft (31) when the L-shaped plate (341) moves horizontally. A synchronous component (35) is connected between the ends of the two screw rods (33). The synchronous component (35) is a chain drive or a pulley drive, and a pin (36) is provided on the side of the synchronous component (35) away from the screw rod (33). The pin (36) is connected to the shaft of the external drive motor to achieve rotational power transmission. Note: For the convenience of showing the structure, the drive motor is not shown in the figure, but it should be within the technical scope that those skilled in the art should understand. Specifically, in this embodiment, the synchronous component (35) is only shown as a pulley drive, which is specifically composed of synchronous wheels fixed to the ends of the two screw rods (33) and a synchronous belt connected between the two synchronous wheels, wherein the pin (36) is fixedly connected to the center of one of the synchronous wheels.

[0029] Furthermore, a plurality of support shafts (31) are rotatably arranged on the top of the pull-out stand (1) and between the two concave plates (21). The plurality of support shafts (31) are arranged horizontally and equidistantly, and the top surface of each support shaft (31) is on the same horizontal line as the top surface of the jaw plate (245) located below. The function is that when the aluminum alloy plate contacts the top of each support shaft (31) horizontally, spaced supports are formed at the bottom of the aluminum alloy plate through each support shaft (31), and the bottoms on both sides thereof are just in contact with the top surfaces of the jaw plates (245) located below.

[0030] Furthermore, a rotating rod (37) is rotatably connected to one side of the top of the exhibition stand (1) near the pin shaft (36), and a cotton sleeve (371) is provided on the outside of the rotating rod (37), and when the aluminum alloy plate is placed horizontally on the top surface of the L-shaped plate (341), the top surface of the aluminum alloy plate just contacts the bottom of the cotton sleeve (371).

[0031] When in use: to facilitate the transfer of the aluminum alloy plate to the stretching processing area and to enable it to accurately cooperate with the clamping structure (24).

[0032] Before the aluminum alloy plate is stretched, the aluminum alloy plate is placed horizontally on two L-shaped plates (341) by an external transfer and lifting device. Subsequently, the external drive motor is started, and the pin shaft (36) is driven to rotate through the machine shaft. Through the synchronization component (35), the rotational power can be synchronously transmitted to the two screw rods (33), so that the two screw rods (33) rotate at the same speed and direction. When the screw rod (33) rotates, the nut sleeve (34) threadedly connected to it slides smoothly along the horizontal groove on the support plate (32) under the drive of the screw rod (33). The L-shaped plate (341) on the top of the nut sleeve (34) moves horizontally accordingly, and the horizontal surface on the top of the L-shaped plate (341) is used to support the aluminum alloy plate. The end face of one side of the plate contacts the inner side face of the rectangular protrusion, thereby pushing the plate.

[0033] During the pushing process, a plurality of support shafts (31) rotatably arranged on the top of the pull-out platform (1) play a supporting role. The top surface of the support shaft (31) and the top surface of the lower jaw plate (245) are on the same horizontal line. The bottom of the aluminum alloy plate contacts the top of the support shaft (31), forming a spacer support at the bottom of the plate. At the same time, the bottom of both sides of the plate contacts the top surface of the lower jaw plate (245), ensuring the stability of the plate during the pushing process.

[0034] During the pushing process of the aluminum alloy plate, the top surface of the aluminum alloy plate contacts the bottom of the cotton sleeve (371). As the L-shaped plate (341) pushes, the cotton sleeve (371) and the top surface of the plate generate friction, driving the rotating rod (37) to rotate, and the cotton sleeve (371) is used to absorb and remove impurities attached to the surface of the aluminum alloy plate.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. These modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention. In this application, the rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slipping or wear, and their exteriors are all provided with corresponding protective shells. However, in the drawings of this application, in order to clearly indicate the connection status of the moving parts, they are not shown. In addition, it can be understood that the various components in this application are made of metal or plastic materials with adaptable strength in the field to which they belong to ensure that their structural rigidity meets actual needs.

Claims

1. An aluminum alloy plate stretching device, comprising a stretching platform (1), and a first hydraulic cylinder (11) and a second hydraulic cylinder (12) symmetrically arranged on both sides of the top surface of the stretching platform (1), a main controller (13) is installed on one side of the top of the stretching platform (1), characterized in that: A linear positioning mechanism is provided between the piston rods of the first hydraulic cylinder (11) and the second hydraulic cylinder (12); It includes a positioning structure and an adjusting structure; The positioning structure comprises concave plates (21) respectively fixedly connected to the ends of the piston rods of the first hydraulic cylinder (11) and the second hydraulic cylinder (12), wherein two concave plates (21) are provided, and array rods (22) are provided on the sides of the two concave plates (21) close to each other, and an even number of hole plates (23) equidistantly distributed in the horizontal direction are slidably provided on the array rods (22); A clamping structure (24) is fixedly provided on one side of each perforated plate (23) away from the concave plate (21); It comprises a positioning plate (241) fixedly connected to the side of each hole plate (23) away from the concave plate (21), a small hydraulic cylinder (242) fixedly installed in the middle of the positioning plate (241), a piston rod end of the small hydraulic cylinder (242) fixedly connected to a pressing block (243), two inclined plane blocks (244) are symmetrically slidably provided on the side of the positioning plate (241) away from the hole plate (23), the pressing block (243) is slidably provided on the inclined plane of the inclined plane block (244) on the side away from the small hydraulic cylinder (242), and a jaw plate (245) is detachably connected to the side of the two inclined plane blocks (244) away from the pressing block (243); The adjustment structure is used to adjust the distance between the clamping structures (24) on two adjacent perforated plates (23).

2. The aluminum alloy sheet stretching device according to claim 1, characterized in that: The array rod (22) is composed of a plurality of cylindrical rods equidistantly distributed in the vertical direction. A circular hole is provided on each hole plate (23) at a position corresponding to each array rod (22). Each hole plate (23) is passed through the corresponding circular hole on the corresponding cylindrical rod and can slide along the cylindrical rod.

3. The aluminum alloy sheet stretching device according to claim 1, characterized in that: A T-shaped opening groove is provided on one side of the positioning plate (241) away from the hole plate (23), and the two inclined surface blocks (244) are slidably connected to the T-shaped opening groove through the T-shaped portions at their ends. The inclined surfaces of the two inclined surface blocks (244) are both provided with concave slots, and the upper and lower surfaces of the pressing block (243) are provided with protruding blocks that slide in the slots.

4. The aluminum alloy sheet stretching device according to claim 1, characterized in that: Slide blocks (2101) are fixedly provided on both sides of the bottom of the two concave plates (21), and a slide rail (2102) is fixedly provided on the top of the exhibition stand (1), and the slide blocks (2101) and the slide rail (2102) are slidably matched.

5. The aluminum alloy sheet stretching device according to claim 1, characterized in that: The adjustment structure includes a servo electric cylinder (25) fixedly mounted on the side of the two concave plates (21) away from each other, a lifting plate (26) is slidably arranged on the side of the two concave plates (21) close to each other, and two groups of mirror-image inclined grooves (27) are arranged on the surface of the lifting plate (26). The two groups of mirror-image inclined grooves (27) are symmetrically arranged with respect to the central axis of the lifting plate (26), and each group of mirror-image inclined grooves (27) is composed of an even number of inclined through grooves. The top of each hole plate (23) close to the mirror-image inclined groove (27) is provided with a sliding convex shaft (28), and the sliding convex shaft (28) is passed through and slides in the corresponding through groove.

6. The aluminum alloy sheet stretching device according to claim 5, characterized in that: Both sides of the lifting plate (26) are provided with dovetail-shaped parts, and the lifting plate (26) slides in the dovetail grooves on the inner walls of both sides of the concave plate (21) through the dovetail-shaped parts.

7. The aluminum alloy sheet stretching device according to claim 5, characterized in that: The end portion of the sliding convex shaft (28) passing through one end of the through groove is provided with a circular limiting portion, and the outer diameter of the circular limiting portion is larger than the outer diameter of the sliding convex shaft (28).

8. The aluminum alloy sheet stretching device according to claim 1, characterized in that: The invention also includes a pushing mechanism arranged on the exhibition stand (1), which includes two support plates (32) symmetrically fixedly arranged on the exhibition stand (1), and the two support plates (32) are both rotatably connected to a screw rod (33), a screw thread sleeve on the screw rod (33) is provided with a nut sleeve block (34), the bottom of the nut sleeve block (34) is slidably arranged in a horizontal groove on the support plate (32) through a sliding protrusion, and an L-shaped plate (341) is fixedly provided on the top of the nut sleeve block (34), the top of the L-shaped plate (341) has a horizontal surface, and a rectangular protrusion is provided on the side of the horizontal surface away from the support plate (32), and the L-shaped plate (341) is located on both sides of the support shaft (31), and a synchronous component (35) is transmission-connected between the ends of the two screw rods (33), and the synchronous component (35) is chain-driven or pulley-driven, and a pin shaft (36) is provided on the side of the synchronous component (35) away from the screw rod (33), and the pin shaft (36) is connected to the shaft of the external drive motor to realize rotational power transmission.

9. The aluminum alloy sheet stretching device according to claim 8, characterized in that: A plurality of support shafts (31) are rotatably arranged on the top of the exhibition stand (1) and between the two concave plates (21). The support shafts (31) are arranged horizontally and equidistantly, and the top surface of each support shaft (31) is on the same horizontal line as the top surface of the jaw plate (245) below.

10. The aluminum alloy sheet stretching device according to claim 8 or 9, characterized in that: A rotating rod (37) is rotatably connected to one side of the top of the pull-out stand (1) near the pin (36), and a cotton sleeve (371) is provided on the outer sleeve of the rotating rod (37). When the aluminum alloy plate is horizontally placed on the top surface of the L-shaped plate (341), the top surface of the aluminum alloy plate just contacts the bottom of the cotton sleeve (371).

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