Workpiece taking and placing, heating and hot pressing circulation forming method

Abstract

The invention provides a workpiece taking and placing, heating and hot-pressing circulation forming method capable of reducing circulation of nail frames and improving operation efficiency, which is particularly suitable for forming of polyurethane arc-shaped plates and comprises the following steps of: when a heating station is in a non-heating state, forwards moving a heating nail frame with a heated sheet to a lifting table from an upper rail, and then moving the heating nail frame to the lifting table from a lower rail; a nail taking and placing frame located on the workbench is moved forwards to an upper rail of a heating station from a piece taking and placing station; when the heating station is in a heating state, the hot-pressing nail frame with the cooled and formed part is moved backwards to the workbench from the lower track, and the part is taken out; a next sheet to be formed is placed on a nail taking and placing frame located on the workbench and fixed; the upper die moves downwards to drive the hot-pressing nail frame located on the lifting table to move downwards to be assembled with the lower die, the sheet in the hot-pressing nail frame is subjected to hot pressing, then cooling is conducted, the upper die moves upwards, and the die is opened; and the lifting table ascends, and the hot-pressing nail frame with the cooled and formed parts on the lifting table moves backwards to the lower track.

Description

Technical Field

[0001] The invention relates to a preparation process of hot-pressing formed parts, in particular to a method for taking and placing workpieces, heating, and hot-pressing cyclic forming, which can improve operation efficiency. Background Art

[0002] For the preparation of ordinary polyurethane flat sheet materials, generally, a polyurethane foam material is sprayed on a sponge board to form a sheet (substrate), which is then heated, sent to a hot press for hot pressing, and then cooled for demolding. For the preparation of large-sized polyurethane curved sheets, the periphery of the sheet must be inserted with material nails on the periphery of the nail frame, and the nail frame is heated and hot pressed together with the substrate. In this way, the periphery of the sheet is pulled by the material nails, and the edge of the substrate cannot shrink inward during hot pressing, so a curved polyurethane sheet can be formed. But obviously, compared with the preparation of polyurethane flat sheets, the preparation of curved polyurethane sheets not only requires fixing the periphery of the sheet on the nail frame (inserting material nails around the nail frame), but also requires removing the formed parts from the nail frame after the curved polyurethane sheet is formed. At the same time, it is also necessary to consider the problem of the nail frame moving together with the substrate.

[0003] The production of conventional curved polyurethane sheets generally follows multiple steps, such as placing the sheet, pressing the sheet into the nail frame, heating, hot pressing and cooling, and removing the formed parts from the nail frame. Each step is completed at one workstation, which occupies a large work area. In addition, the transfer of the nail frame between different workstations is troublesome and time-consuming. Moreover, due to different operation times for different steps, some workstations need to stop and wait for other workstations to complete the operation, which seriously affects the operation efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a method for taking and placing workpieces, heating and hot pressing cycle molding which can reduce the circulation of nail frames and improve the working efficiency, and the method is particularly suitable for molding polyurethane arc plates.

[0005] The method for placing and picking up workpieces, heating and hot pressing cycle forming comprises a placing and picking up workpiece station 1, a heating station 5 and a hot pressing station 9.

[0006] The workpiece placement station 1 is used to push upward the formed parts on the pick-and-place nail frame 2 so that the parts are separated from the material nails 101, and after the parts are removed and the sheet to be formed is placed on the pick-and-place nail frame 2, the sheet to be formed is pressed down so that the material nails 101 on the pick-and-place nail frame 2 penetrate into the lower periphery of the sheet; the workpiece placement station 1 has a workbench 11 for supporting the pick-and-place nail frame 2, a lower pressing plate 12 that can move up and down relative to the workbench 11 is provided above the workbench 11, and an upper top plate 14 that can move up and down relative to the workbench 11 is provided below the workbench 11;

[0007] The heating station 5 has an upper rail 53 and a lower rail 54 which are arranged up and down and can be raised and lowered synchronously. The upper rail 53 is used to support the heating nail frame 3, and the lower rail 54 is used to support the hot pressing nail frame 4. A heating plate 55 is provided above the upper rail 53. The heating station 5 has two working states: a heating state and a non-heating state. In the non-heating state, the upper rail 53 is flush with the workbench 11, and the upper rail 53 is away from the heating plate 55. In the heating state, the lower rail 54 is flush with the workbench 11, and the upper rail 53 is close to the heating plate 55, so as to heat the sheet in the heating nail frame 3 on the upper rail 53.

[0008] The hot pressing station 9 is used to hot press the heated sheets in the hot pressing nail frame 4 and drive the hot pressing nail frame 4 to rise and fall; the hot pressing station 9 has a lower mold 92 fixed to the bottom of the hot pressing frame 90, an upper mold 91 that moves up and down relative to the lower mold 92, and a lifting platform 94 that is located between the upper mold 91 and the lower mold 92 and can move up and down relative to the hot pressing frame 90; the lifting platform 94 is used to support the hot pressing nail frame 4 and can be lifted and lowered to a nail frame entry and exit position flush with the workbench 11;

[0009] There are three nail frames 100 used in the cyclic molding method. The nail frame 100 moved to the workbench 11 is called the pick-and-place nail frame 2, the nail frame 100 moved to the upper track 53 is called the heating nail frame 3, and the nail frame 100 moved to the lifting platform 94 or the lower track 54 is called the hot pressing nail frame 4.

[0010] Each nail frame 100 has material nails 101 arranged in a quadrilateral and extending upward; the material nails 101 are used to pierce the lower periphery of the sheet to be formed, or the lower periphery of the part obtained after the sheet is formed;

[0011] The heating station 5 changes between a heating state and a non-heating state;

[0012] When the heating station 5 is in a non-heating state, step a and step b are performed simultaneously or successively:

[0013] Step a: Move the heating nail frame 3 with the heated sheet forward from the upper track 53 to the lifting platform 94;

[0014] Step b: Move the nail picking and placing frame 2 on the workbench 11 forward from the picking and placing station to the upper track 53 of the heating station 5;

[0015] When the heating station 5 is in the heating state and the heating plate 55 heats the sheet in the heating nail frame 3 on the upper track 53, step c and step d are performed simultaneously before step e is performed:

[0016] Step c: Move the hot pressing nail frame 4 with the cooled and formed parts backward from the lower track 54 to the workbench 11; the upper top plate 14 rises to push the formed parts upward, and the periphery of the parts are separated from the material nails 101; take out the formed parts; then the upper top plate 14 descends; place the next sheet to be formed on the pick-and-place nail frame 2 located on the workbench 11, and the lower pressing plate 12 descends to press the sheet, and the material nails 101 on the pick-and-place nail frame 2 penetrate into the periphery of the lower part of the sheet; the lower pressing plate 12 rises;

[0017] Step d: the upper mold 91 moves downward, driving the lifting platform 94 and the hot pressing nail frame 4 on the lifting platform 94 to move downward, and close the mold with the lower mold 92 to hot press the sheet in the hot pressing nail frame 4, and then cool it;

[0018] Step e: the upper mold 91 moves upward to open the mold; the lifting platform 94 rises to the nail frame entry and exit position, and the hot pressing nail frame 4 with the cooled and formed parts on the lifting platform 94 is moved backward to the lower track 54.

[0019] As a further improvement to the above-mentioned method of placing and picking up workpieces, heating, and hot pressing cycle forming,

[0020] When the heating station 5 is in a non-heating state, first perform step a0, and then perform step a and step b simultaneously or successively:

[0021] Step a0: loosening the fixing of the heating nail frame 3 with the heated sheet on the upper rail 53, so that the heating nail frame 3 can move forward and backward;

[0022] Step a: comprising the steps of: a1: moving the heating nail frame 3 with the heated sheet forward from the upper track 53 to the lifting platform 94; a2: fixing the hot pressing nail frame 4 on the lifting platform 94 to the lifting platform 94 to prevent it from moving forward and backward;

[0023] Step b: comprising the steps of: b1: moving the nail frame 2 on the workbench 11 forward from the pick-and-place station to the upper track 53 of the heating station 5; b2: fixing the heating nail frame 3 on the upper track 53 to prevent it from moving forward and backward;

[0024] When the heating station 5 is in the heating state and the heating plate 55 heats the sheet in the heating nail frame 3 on the upper track 53, step c and step d are performed simultaneously before step e is performed:

[0025] Step c: includes the following steps: c1: loosen the fixation of the hot pressing nail frame 4 on the lower track 54, so that the hot pressing nail frame 4 can move forward and backward on the lower track 54; move the hot pressing nail frame 4 with the cooled and formed parts backward from the lower track 54 to the workbench 11; c2: fix the pick-and-place nail frame 2 on the workbench 11 on the workbench 11 to prevent it from moving upward; c3: the upper top plate 14 rises, pushes the formed parts upward, and the periphery of the parts is separated from the material nails 101; c4: take out the formed parts; c5: then the upper top plate 14 descends; c6: place the next sheet to be formed on the pick-and-place nail frame 2 located on the workbench 11, c7: the lower pressing plate 12 descends to press the sheet downward, and the material nails 101 on the pick-and-place nail frame 2 penetrate into the periphery of the lower part of the sheet; c8: the lower pressing plate 12 rises; c9: loosen the fixation of the pick-and-place nail frame 2 on the workbench 11;

[0026] Step d: the upper mold 91 moves downward, driving the lifting platform 94 and the hot pressing nail frame 4 on the lifting platform 94 to move downward, and close the mold with the lower mold 92 to hot press the sheet in the hot pressing nail frame 4, and then cool it;

[0027] Step e: includes the following steps: e1: the upper mold 91 moves up and the mold is opened; e2: the lifting platform 94 rises to the nail frame entry and exit position; e3: loosening the fixation of the hot pressing nail frame 4 on the lifting platform 94, and moving the hot pressing nail frame 4 with the cooled and formed parts on the lifting platform 94 backward to the lower track 54; e4: fixing the hot pressing nail frame 4 on the lower track 54 to prevent it from moving forward and backward.

[0028] As a further improvement to the above-mentioned method for placing and picking up workpieces, heating, and hot pressing cycle forming, the heating station 5 has a heating frame 50, and on the left and right sides of the heating frame 50, there are respectively a left lifting frame 51 and a right lifting frame 52 that slide up and down relative to the heating frame 50; the upper rail 53 and the lower rail 54 both have two left and right rails extending in parallel to the forward and backward moving direction of the nail frame; the left lifting frame 51 is located on the left side, i.e., the outer side, of the upper left rail 531 and the lower left rail 541, and is connected to the upper left rail 531 and the lower left rail 541; the right lifting frame 52 is located on the right side, i.e., the outer side, of the upper right rail 532 and the lower right rail 542, and is connected to the upper right rail 532 and the lower right rail 542; the heating plate 55 fixed on the heating frame 50 is above the upper rail and between the left lifting frame 51 and the right lifting frame 52; and a lifting drive device 400 is provided on the top of the heating frame 50 to drive the left lifting frame 51 and the right lifting frame 52 to slide up and down synchronously.

[0029] As a further improvement to the above-mentioned method for picking up and placing workpieces, heating, and hot pressing cycle forming, in the heating station 5, the outer side of the left upper rail 531, i.e. the left side, or the outer side of the right upper rail 532, i.e. the right side, has an upper slide rail 61 fixed on the left lifting frame 51 or the right lifting frame 52, and the upper slide rail 61 has an upper slider 63, and the upper slider 63 is connected to an upper linear drive device 600 that drives it to move along the upper slide rail 61, and the upper slider 63 is swingably connected to an upper push-pull block 65 on the inner side of the upper slider 63, and the upper push-pull block 65 can be connected to or disconnected from the heating nail frame on the upper rail 53 when it swings to different positions relative to the upper slider 63; when the upper push-pull block 65 is connected to the heating nail frame, the upper linear drive device 600 is actuated, and the heating nail frame is driven to move back and forth on the upper rail 53 through the upper slider 63 and the upper push-pull block 65;

[0030] The outer side of the lower left rail 541, i.e. the left side, or the outer side of the lower right rail 542, i.e. the right side, has a lower sliding rail 62 fixed on the left lifting frame 51 or the right lifting frame 52, and the lower sliding rail 62 has a lower slider 64, and the lower slider 64 is connected to a lower linear drive device 660 that drives it to move along the lower sliding rail 62, and the lower slider 64 is swingably connected to a lower push-pull block 66 on the inner side, and when the lower push-pull block 66 swings to different positions relative to the lower slider 64, it can be connected to or disconnected from the hot pressing nail frame 4; when the lower push-pull block 66 is connected to the hot pressing nail frame 4, the lower linear drive device 660 is activated, and the hot pressing nail frame 4 is driven to move back and forth on the lower track through the lower slider 64 and the lower push-pull block 66.

[0031] As a further improvement to the above-mentioned method of picking up and placing workpieces, heating, and hot pressing cycle forming, the heating station 5 is provided with a heating frame positioning device 800 for positioning the heating nail frame 3 on the upper rail 53 to prevent the heating nail frame 3 from moving back and forth on the upper rail 53, and a hot pressing frame positioning device 880 for positioning the hot pressing nail frame 4 on the lower rail 54 to prevent the hot pressing nail frame 4 from moving back and forth on the lower rail 54; the heating frame positioning device 800 is arranged on the left lifting frame 51 and the right lifting frame 52 opposite to the upper slide rail 61; the hot pressing frame positioning device 880 is arranged on the left lifting frame 51 and the right lifting frame 52 opposite to the lower slide rail 62.

[0032] As a further improvement to the above-mentioned method of placing and picking up workpieces, heating, and hot pressing cycle forming, the heating frame positioning device 800 and the hot pressing frame positioning device 880 both include a thrust device and a clamping device, the thrust device includes a thrust rod that moves relative to the nail frame 100 in the left-right direction under the drive of the thrust cylinder, and the clamping device includes a rotating sleeve that moves relative to the nail frame 100 in the front-back direction under the drive of the clamping cylinder, and the clamping rod set on the rotating sleeve is swung in a plane perpendicular to the front-back direction;

[0033] When the thrust rod and the clamping rod are simultaneously located at the front and rear ends of the nail frame 100 , the clamping rod moves toward the thrust rod driven by the clamping cylinder, thereby clamping the nail frame 100 .

[0034] As a further improvement to the above-mentioned method of picking up and placing workpieces, heating, and hot pressing cycle molding, the workpiece picking up and placing station 1 is provided with a picking up and placing bracket 10, a workbench 11 is arranged on the picking up and placing bracket 10, a lower pressure plate 12 is connected to the piston rod of a lower pressure cylinder 13 arranged on the picking up and placing bracket 10 and located above the workbench 11, and an upper push plate 14 is connected to the piston rod of an upper push cylinder 15 arranged on the picking up and placing bracket 10 and located below the workbench 11.

[0035] As a further improvement to the above-mentioned method for picking up and placing workpieces, heating, and hot pressing cycle molding, one end of the nail frame 100 has a recess 672 extending in the up-down direction; in the workpiece picking up and placing station 1, the workbench 11 includes a picking up and placing track 16 for supporting the nail frame 100; the picking up and placing track 16 includes a left track 161 and a right track 162 extending in the front-to-back direction and parallel to each other; the inner side of the left track 161, i.e., the right side, or the inner side of the right track 162, i.e., the left side, has a picking up and placing slide fixed on the workbench 11 Rail 17, the pick-and-place slide rail 17 is provided with a pick-and-place slider 18, the pick-and-place slider 18 is connected to a pick-and-place linear drive device 200 that drives it to move along the pick-and-place slide rail 17, the pick-and-place slider 18 is connected to a pick-and-place push-pull block 19, and the pick-and-place push-pull block 19 has a clamping plate 191 extending laterally into a recess 672 on the nail frame 100; the pick-and-place linear drive device 200 drives the pick-and-place slider 18 to move, and drives the nail frame 100 to move back and forth on the pick-and-place rail 16 through the pick-and-place push-pull block 19.

[0036] As a further improvement to the above-mentioned method of picking up and placing workpieces, heating, and hot pressing cycle forming, a clamping device 300 is provided in the picking up and placing workpiece station 1. The clamping device 300 is used to press the picking up and placing nail frame 2 onto the picking up and placing track 16 when the upper top plate 14 pushes the formed parts on the picking up and placing nail frame 2 upward.

[0037] As a further improvement to the above-mentioned method of picking up and placing workpieces, heating, and hot pressing cycle forming, in the hot pressing station 9, the upper mold 91 is connected to the piston rod of the hot pressing cylinder 93 that drives it to move up and down, and the cylinder body of the hot pressing cylinder 93 is arranged on the hot pressing frame 90; the lifting platform 94 includes a hot pressing track 95 for supporting the nail frame; the hot pressing track 95 includes a left hot pressing track 951 and a right hot pressing track 952 that are parallel to each other and extend in the front and rear directions and are located on the left and right sides of the hot pressing frame 90; the front and rear ends of the left hot pressing track 951 and the right hot pressing track 952 are fixed on a lifting block 96, each lifting block 96 is slidably arranged on a vertical guide rail 97 fixed on the hot pressing frame 90, and each lifting block 96 is connected to the piston rod of a lifting cylinder 98 arranged on the hot pressing frame 90.

[0038] As a further improvement to the above-mentioned method of picking up and placing workpieces, heating, and hot pressing cycle forming, the hot pressing station 9 is provided with a pushing device 99, which is used to fix the hot pressing nail frame 4 on the hot pressing track 95 to prevent it from moving forward and backward; the pushing device 99 includes a limit block 991 fixed on the lifting block 96 at the front end for limiting the forward movement of the nail frame, a swing push rod 992 set on the lifting block 96 at the rear end and swinging back and forth, the cylinder barrel of the pushing cylinder 993 is hinged on the lifting block 96 at the rear end, and the piston rod of the pushing cylinder 993 is hinged to the swing push rod 992; the pushing cylinder 993 is actuated to drive the swing push rod 992 to swing back and forth, and when the swing push rod 992 swings forward, the swing push rod 992 can contact with the rear end of the nail frame and push the nail frame forward until the front end of the nail frame contacts the limit block 991. When the swing push rod 992 swings backward and the upper part of the swing push rod 992 is lower than the bottom of the nail frame, the nail frame can move backward relative to each other.

[0039] Beneficial effects of the present invention:

[0040] The heating station 5 is provided with an upper track and a lower track, so that when the sheet in the nail frame on the upper track is heated near the heating plate 55, the hot pressing nail frame 4 with the cooled and formed parts can be moved backward from the lower track to the workbench 11 to take out the parts and place new sheets, thereby improving the working efficiency;

[0041] When the heating plate 55 heats the sheet in the heating nail frame 3 on the upper track, the hot press machine heats and presses the sheet in the hot pressing nail frame 4 on the lifting platform 94, cools and shapes it, and then moves the hot pressing nail frame 4 with the cooled and formed parts backward to the lower track. In other words, heating, hot pressing, cooling, and moving the hot pressing nail frame 4 to the lower track are performed simultaneously, which reduces the waiting time.

[0042] The step of moving the heating nail frame 3 with the heated sheet forward from the upper track to the lifting platform 94 and the step of moving the pick-and-place nail frame 2 located on the workbench 11 from the pick-and-place station forward to the upper track of the heating station 5 can be performed simultaneously, which also reduces waiting time and improves work efficiency.

[0043] Due to the lower track, the sheet in the hot pressing nail frame 4 can "turn back", that is, move from front to back, after being hot pressed and cooled on the hot press, and smoothly return to the workpiece picking and placing station 1 through the transfer function of the lower track, thereby avoiding the hot pressing nail frame 4 returning to the workpiece picking and placing station 1 through other long-distance paths.

[0044] The workpiece placement station 1 integrates the lower pressure plate 12 and the upper top plate 14. The nail frame does not need to be moved in one station, which not only realizes the removal of the formed parts from the nail frame, but also realizes the pressing of the sheet into the nail frame, saving operation time and simplifying the overall layout and structure of the circulation molding device.

[0045] The entire cycle molding method only needs to use three nail frames 100, which reduces the circulation time of the nail frames 100. The structures of the nail frames are the same. It should be noted that in the molding process of any part, each nail frame 100 needs to cyclically go through the steps of placing the sheet, pressing the sheet into the nail frame, heating, hot pressing and cooling, and removing the molded parts from the nail frame. Pick-up and placement nail frame 2, heating nail frame 3, and hot pressing nail frame 4 are different names for each nail frame 100 in different positions. In other words, the nail frame on the workbench 11 is called the pick-up and placement nail frame 2, and the pick-up and placement nail frame 2 moves to the upper track to become the heating nail frame 3, and the heating nail frame 3 moves to the lifting platform 94 to become the hot pressing nail frame 4, and the hot pressing nail frame 4 moves to the lower track and is still called the hot pressing nail frame 4, and the hot pressing nail frame 4 moves to the workbench 11 to be the pick-up and placement nail frame 2.

[0046] In the non-heating state, the upper track is flush with the workbench 11, and the lifting platform 94 can also be lifted to the nail frame entry and exit position flush with the upper track. The nail frame moves forward from the workbench 11 of the workpiece placement station 1 to the upper track, or the nail frame moves forward from the upper track to the lifting platform 94, which is very fast and convenient. In the heating state, the lower track is flush with the workbench 11, and the lifting platform 94 can also be lifted to the nail frame entry and exit position flush with the lower track. The nail frame moves backward from the lower track to the workbench 11, or the nail frame moves backward from the lifting platform 94 to the lower track, which is also very fast and convenient.

[0047] The lifting drive device 400 drives the left lifting frame 51 and the right lifting frame 52 to slide up and down synchronously, so as to realize the rapid change of the heating station 5 between the heating state and the non-heating state.

[0048] The upper push-pull block 65 is swung to different positions relative to the upper slider 63 to achieve connection or disconnection with the nail frame, and the lower push-pull block 66 is swung to different positions relative to the lower slider 64 to achieve connection or disconnection with the hot press nail frame 4, which is quick and convenient to operate;

[0049] The heating frame positioning device 800 can fix the heating nail frame 3 on the upper track when the upper track and the lower track are raised and lowered to prevent it from moving forward and backward. The hot pressing frame positioning device 880 can fix the hot pressing nail frame 4 on the lower track when the upper track and the lower track are raised and lowered to prevent it from moving forward and backward. The heating frame positioning device 800 and the hot pressing frame positioning device 880 both use thrust cylinders, thrust rods, clamping cylinders, rotating sleeves, clamping rods, etc., which can quickly clamp or release the nail frame forward and backward, and when the clamping of the nail frame is released, it is to leave in the front and rear direction of the nail frame, which will not hinder the front and rear movement of the nail frame.

[0050] The heat-insulating plate 59 can isolate the radiation heating of the formed parts in the hot-press nail frame 4 on the lower track by the heating plate 55 .

[0051] The smoke hood and the smoke exhaust duct can absorb and exhaust the waste gas generated when the sheet is heated to prevent pollution.

[0052] The left track 161, the upper left track 531 in the non-heating state, and the left hot pressing track 951 at the position of entering and exiting the nail frame are in a collinear line, and the right track 162, the upper right track 532 in the non-heating state, and the right hot pressing track 952 at the position of entering and exiting the nail frame are in a collinear line.

[0053] The upper slide rail 61 is on the outside of the upper rail (the upper left rail 531 or the upper right rail 532), the pick-up and place slide rail 17 is located on the inside of the pick-up and place rail 16 (the left rail 161 or the right rail 162), and the pick-up and place push-pull block 19 fixed on the pick-up and place slider 18 sliding on the pick-up and place slide rail 17 has a clamping plate 191 extending laterally (left and right), and the clamping plate 191 extends into the recess 672 extending in the up-down direction at one end of the nail frame; therefore, after the pick-up and place push-pull block 19 drives the nail frame to move forward to the upper rail, the pick-up and place push-pull block 19 does not need to move, and will not hinder the up-down movement of the upper rail and the lower rail and the nail frame located on the upper rail and the lower rail. In this way, the sequential continuous operation of each step can be ensured with a simple structure.

[0054] The clamping device 300 can press the pick-and-place nail frame 2 onto the pick-and-place rail 16 when the upper top plate 14 pushes the formed parts on the pick-and-place nail frame 2 upward. The clamping device 300 uses a hook 31 whose bottom surface is flush with the upper surface of the nail frame, a hook 32, a moving block 33, a clamping cylinder 34, etc., which can quickly press the front and rear ends of the nail frame up and down onto the workbench 11, or quickly release them. When the clamping of the nail frame is released, the moving block 33 and the hook 32 can be away from the front end of the nail frame in the front and rear direction of the nail frame, so that the front and rear movement of the nail frame will not be hindered.

[0055] In the hot pressing station 9, the lifting cylinder 98 drives the lifting platform 94 up and down through the lifting block 96, and lifts the nail frame on the lifting platform 94 to a required height. At the same time, the nail frame and the lifting platform 94 can move downward with the upper mold 91 and close the mold with the lower mold 92 to achieve hot pressing. The overall structure of the hot pressing station 9 is simple and practical.

[0056] When the swing push rod 992 in the pushing device 99 swings forward and upward, it can push the nail frame on the lifting platform 94 forward, so that the front end of the nail frame contacts the limit block 991, and the nail frame is quickly fixed on the lifting platform 94; when the swing push rod 992 swings backward and downward, the nail frame is released from the lifting platform 94, and at the same time, it does not hinder the nail frame from moving backward. The pushing device 99 can quickly fix or release the hot press nail frame 4 with a simple structure, and the action is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 ,2 All are three-dimensional diagrams of the cycle forming device;

[0058] Figure 3 , 4 5 are three-dimensional diagrams of the pick-and-place track, upper track, lower track, hot pressing track, etc.;

[0059] Figure 6 , 7 , 8 are three-dimensional diagrams of the workpiece placement station;

[0060] Fig. 9 , 10 , 11 are three-dimensional diagrams of nail frames, pick-up and placement rails, pick-up and placement slide rails, etc.;

[0061] Fig.12 , 13 They are Fig. 9 , 10 A partial enlarged view of the

[0062] Fig.14 , 15 They are all three-dimensional images of the pick-and-place rails, pick-and-place slides, and upper top plates;

[0063] Fig.16 , 17 They are all three-dimensional images of the pick-and-place linear drive device, the pick-and-place track, etc.;

[0064] Fig.18 , 19 20 are three-dimensional diagrams of the heating station;

[0065] Fig.21 , 22 23 are three-dimensional diagrams of the heating plate, the heat insulating plate, the upper track, the lower track, etc.;

[0066] Fig.24 yes Fig. 22 A partial enlarged view of the

[0067] Fig.25 , 26 They are all three-dimensional images of nail frames, upper tracks, lower tracks, etc.;

[0068] Fig. 27 , 28 They are Fig.25 , 26 A partial enlarged view of the

[0069] Fig.29 , 30 31 are three-dimensional diagrams of the heating plate, the upper linear drive device, the lower linear drive device, etc.;

[0070] Fig.32 It is a three-dimensional picture of the nail frame;

[0071] Fig.33 yes Fig.32 A partial enlarged view of the

[0072] Fig.34 , 35 They are all three-dimensional views of the lower push-pull block, the lower linear drive device, etc.;

[0073] Fig.36 , 37 They are Fig.34 , 35 A partial enlarged view of the

[0074] Fig.38 It is a three-dimensional picture of the hot pressing station;

[0075] Fig.39 It is a three-dimensional diagram of vertical guide rails, hot pressing tracks, etc.;

[0076] Fig.40 It is a three-dimensional diagram of the right hot pressing track, pushing device, etc.

[0077] In the figure, the workpiece pick-up and placement station 1, the pick-up and placement bracket 10, the workbench 11, the lower pressure plate 12, the lower pressure cylinder 13, the upper top plate 14, the upper top cylinder 15, the pick-up and placement track 16, the left track 161, the right track 162; the pick-up and placement slide rail 17, the pick-up and placement slider 18, the pick-up and placement push-pull block 19, and the card plate 191

[0078] Nail frame 100, pick-up and place nail frame 2, material nail 101, heating nail frame 3, hot pressing nail frame 4,

[0079] The pick-and-place linear drive device 200, the pick-and-place chain 21, the active pick-and-place sprocket 28, and the driven pick-and-place sprocket 29,

[0080] A clamping device 300, a hook 31, a draw hook 32, a moving block 33, and a clamping cylinder 34;

[0081] Heating station 5, heating frame 50, left lifting frame 51, right lifting frame 52, upper track 53, upper left track 531, upper right track 532, lower track 54, lower left track 541, lower right track 542, heating plate 55, heat insulation plate 59,

[0082] Upper slide rail 61, lower slide rail 62, upper slider 63, lower slider 64, upper push-pull block 65, lower push-pull block 66, connecting block 67, clamping block 671, recess 672

[0083] Lifting drive device 400, upper linear drive device 600, lower linear drive device 660

[0084] Heating frame positioning device 800, hot pressing frame positioning device 880,

[0085] Hot pressing station 9, hot pressing frame 90, upper die 91, lower die 92, hot pressing oil cylinder 93, lifting platform 94, hot pressing rail 95, left hot pressing rail 951, right hot pressing rail 952, lifting block 96, vertical guide rail 97, lifting oil cylinder 98;

[0086] Pushing device 99, limit block 991, swing push rod 992, pushing cylinder 993.

[0087] Rotating shaft 40, left longitudinal rod 41, right longitudinal rod 42, motor and reducer 43,

[0088] Chain 60, driving sprocket 68, driven sprocket 69,

[0089] Pin 71, rotation limiting rod 72, tension spring 73, upper release cylinder 74, lower release cylinder 75,

[0090] Smoke exhaust device, smoke hood 81, smoke exhaust channel 82,

[0091] Thrust device 85, thrust cylinder 851, thrust rod 852, clamping device 87, clamping cylinder 871, rotating sleeve 872, clamping rod 873. DETAILED DESCRIPTION

[0092] See also Figure 1 The circulation molding device shown has a workpiece picking and placing station 1, a heating station 5, and a hot pressing station 9.

[0093] Each nail frame 100 has material nails 101 arranged in a quadrilateral and extending upward; the material nails 101 are used to pierce the lower periphery of the sheet to be formed, or the lower periphery of the part obtained after the sheet is formed;

[0094] The workpiece placement station 1 is used to push upward the formed parts on the pick-and-place nail frame 2 so that the parts are separated from the material nails 101, and after the parts are removed and the sheet to be formed is placed on the pick-and-place nail frame 2, the sheet to be formed is pressed down so that the material nails 101 on the pick-and-place nail frame 2 penetrate into the lower periphery of the sheet; the workpiece placement station 1 has a workbench 11 for supporting the pick-and-place nail frame 2, a lower pressing plate 12 that can move up and down relative to the workbench 11 is provided above the workbench 11, and an upper top plate 14 that can move up and down relative to the workbench 11 is provided below the workbench 11;

[0095] The heating station 5 has an upper track and a lower track which are arranged up and down and can be raised and lowered synchronously. The upper track is used to support the heating nail frame 3, and the lower track is used to support the hot pressing nail frame 4. A heating plate 55 is provided above the upper track. The heating station 5 has two working states: a heating state and a non-heating state. In the non-heating state, the upper track is flush with the workbench 11 and the upper track is away from the heating plate 55. In the heating state, the lower track is flush with the workbench 11 and the upper track is close to the heating plate 55, so as to heat the sheet in the heating nail frame 3 on the upper track.

[0096] The hot pressing station 9 is used to hot press the heated sheets in the hot pressing nail frame 4 and drive the hot pressing nail frame 4 to rise and fall; the hot pressing station 9 has a lower mold 92 fixed to the bottom of the hot pressing frame 90, an upper mold 91 that moves up and down relative to the lower mold 92, and a lifting platform 94 that is located between the upper mold 91 and the lower mold 92 and can move up and down relative to the hot pressing frame 90; the lifting platform 94 is used to support the hot pressing nail frame 4 and can be lifted and lowered to a nail frame entry and exit position flush with the workbench 11;

[0097] The heating station 5 is provided with a heating frame 50, a left lifting frame 51, a right lifting frame 52, an upper track, a lower track, a heating plate 55, an insulating plate 59, an upper slide rail 61, a lower slide rail 62, an upper slider 63, a lower slider 64, a lifting drive device 400, an upper linear drive device 600, a lower linear drive device 660, a smoke exhaust device, a heating frame positioning device 800, a hot pressing frame positioning device 880, etc.

[0098] On the left and right sides of the heating rack 50, there are respectively a left lifting frame 51 and a right lifting frame 52 that slide up and down relative to the heating rack 50; the upper track and the lower track both have two left and right rails extending in parallel with the forward and backward moving direction of the nail frame; the left lifting frame 51 is located on the left side, i.e., the outside, of the upper left track 531 and the lower left track 541, and is connected to the upper left track 531 and the lower left track 541; the right lifting frame 52 is located on the right side, i.e., the outside, of the upper right track 532 and the lower right track 542, and is connected to the upper right track 532 and the lower right track 542; the heating plate 55 fixed on the heating rack 50 is above the upper track and located between the left lifting frame 51 and the right lifting frame 52; a lifting drive device 400 is provided on the top of the heating rack 50 to drive the left lifting frame 51 and the right lifting frame 52 to slide up and down synchronously.

[0099] The lifting drive device 400 includes a rotating shaft 40 rotatably set on the heating frame 50, gears fixed at both ends of the rotating shaft, racks meshing with each gear are respectively fixed on the left longitudinal rod 41 and the right longitudinal rod 42, the left longitudinal rod 41 and the right longitudinal rod 42 are respectively fixed on the left lifting frame 51 and the right lifting frame 52, and the rotating shaft 40 is connected to the motor and reducer 43 that drive it to rotate.

[0100] In the heating station 5, the outer side of the left upper rail 531, i.e. the left side, or the outer side of the right upper rail 532, i.e. the right side, has an upper slide rail 61 fixed on the left lifting frame 51 or the right lifting frame 52, and the upper slide rail 61 has an upper slider 63, and the upper slider 63 is connected to an upper linear drive device 600 that drives it to move along the upper slide rail 61, and the upper slider 63 is swingably connected to an upper push-pull block 65 on the inner side, and the upper push-pull block 65 can be connected to or disconnected from the heating nail frame on the upper rail when it swings to different positions relative to the upper slider 63; when the upper push-pull block 65 is connected to the heating nail frame, the upper linear drive device 600 is actuated, and the heating nail frame is driven to move back and forth on the upper rail through the upper slider 63 and the upper push-pull block 65;

[0101] The outer side of the lower left rail 541, i.e. the left side, or the outer side of the lower right rail 542, i.e. the right side, has a lower sliding rail 62 fixed on the left lifting frame 51 or the right lifting frame 52, and the lower sliding rail 62 has a lower slider 64, and the lower slider 64 is connected to a lower linear drive device 660 that drives it to move along the lower sliding rail 62, and the lower slider 64 is swingably connected to a lower push-pull block 66 on the inner side, and when the lower push-pull block 66 swings to different positions relative to the lower slider 64, it can be connected to or disconnected from the hot pressing nail frame 4; when the lower push-pull block 66 is connected to the hot pressing nail frame 4, the lower linear drive device 660 is activated, and the hot pressing nail frame 4 is driven to move back and forth on the lower track through the lower slider 64 and the lower push-pull block 66.

[0102] The upper linear drive device 600 and the lower linear drive device 660 are chain drive devices with the same structure, and both include a chain 60, a driving sprocket 68, a plurality of driven sprockets 69, etc. The driving sprocket 68 is connected to the output shaft of the motor that drives it to rotate. The chain 60 in the upper linear drive device 600 is fixed with an upper slider 63, and the chain 60 in the lower linear drive device 660 is fixed with a lower slider 64.

[0103] The upper push-pull block 65 and the lower push-pull block 66 have the same structure, and both have grooves extending in the left-right direction at the front end of the bottom.

[0104] A connecting block 67 is fixed on the right side of the rear end of the nail frame. The connecting block 67 includes a clamping block 671 extending upward and a recess 672 opening toward the left side (inside) and extending in the up-down direction.

[0105] The middle part of the upper push-pull block 65 in the front-back direction is hinged to the inner side of the upper slider 63 through a pin 71. A limited rotation rod 72 is fixed near the front side of the upper push-pull block 65. A tension spring 73 is connected between the upper push-pull block 65 and the upper slider 63 to make the front part of the upper push-pull block 65 swing downward around the pin in a normal state. The upper disengagement cylinder 74 is fixed to the front part of the right lifting frame 52. Under the action of the tension spring 73, the limited rotation rod 72 on the upper push-pull block 65 is in a state of contact with the upper slider 63. When the upper linear drive device 600 drives the upper slider 63 and the upper push-pull block 65 to move backward to a position where the upper part of the rear end of the upper push-pull block 65 is opposite to the piston rod of the upper disengagement cylinder 74, the piston rod of the upper disengagement cylinder 74 extends downward, pushing the upper push-pull block 65 to swing around the pin to overcome the pulling force of the tension spring 73. At this time, the groove at the bottom front end of the upper push-pull block 65 swings upward.

[0106] The structure connecting the lower push-pull block 66 with the lower slider 64 and the upper push-pull block 65 with the upper slider 63 are basically the same and will not be repeated here. However, the lower disengagement cylinder 75 that drives the lower push-pull block 66 to swing is fixed to the rear of the right lifting frame 52.

[0107] When the block 671 on the heating nail frame 3 extends into the groove of the upper push-pull block 65, the upper linear drive device 600 drives the upper slider 63 to move, and drives the heating nail frame 3 to move back and forth on the upper track through the upper push-pull block 65; when the block 671 on the hot pressing nail frame 4 extends into the groove of the lower push-pull block 66, the lower linear drive device 660 drives the lower slider 64 to move, and drives the hot pressing nail frame 4 to move back and forth on the lower track through the lower push-pull block 66.

[0108] The heating frame positioning device 800 positions the heating nail frame 3 on the upper track to prevent the heating nail frame 3 from moving forward and backward on the upper track. The hot pressing frame positioning device 880 positions the hot pressing nail frame 4 on the lower track to prevent the hot pressing nail frame 4 from moving forward and backward on the lower track. The heating frame positioning device 800 is arranged on the left lifting frame 51 and the right lifting frame 52 opposite to the upper slide rail 61; the hot pressing frame positioning device 880 is arranged on the left lifting frame 51 and the right lifting frame 52 opposite to the lower slide rail 62;

[0109] The heating frame positioning device 800 and the hot pressing frame positioning device 880 have the same structure, and both include a thrust device 85 and a clamping device 87. The thrust device 85 includes a thrust rod 852 that moves relative to the nail frame in the left and right directions under the drive of a thrust cylinder 851, and the thrust cylinder 851 is fixed to the left lifting frame 51. The clamping device 87 includes a rotating sleeve 872 that moves relative to the nail frame in the front-to-back direction under the drive of a clamping cylinder 871, and a clamping rod 873 that is set on the rotating sleeve and swings in a plane perpendicular to the front-to-back direction. The cylinder body of the clamping cylinder 871 is fixed to the left lifting frame.

[0110] The front and rear positions of the thrust device 85 and the clamping device 87 in the heating frame positioning device 800 and the hot pressing frame positioning device 880 are different. The thrust device 85 in the heating frame positioning device 800 is located in front of the clamping device 87, and the thrust device 85 in the hot pressing frame positioning device 880 is located behind the clamping device 87.

[0111] Both sides of the heat-insulating plate 59 are fixed on the left lifting frame 51 and the right lifting frame 52 respectively, and the heat-insulating plate 59 is located below the upper track and above the lower track.

[0112] A smoke hood 81 fixed on the heating frame 50 is arranged at the front and rear ends of the heating plate 55, and the top of the smoke hood is communicated with a smoke exhaust passage 82 connected with an exhaust fan. The smoke hood 81, the exhaust fan, the smoke exhaust passage 82, etc. constitute a smoke exhaust device.

[0113] The workpiece picking and placing station 1 has a picking and placing bracket 10, a workbench 11 is arranged on the picking and placing bracket 10, a lower pressing plate 12 is connected to the piston rod of a lower pressing cylinder 13 located above the workbench 11, and an upper pushing plate 14 is connected to the piston rod of an upper pushing cylinder 15 located below the workbench 11. The cylinder bodies of the lower pressing cylinder 13 and the upper pushing cylinder 15 are both fixed on the picking and placing bracket 10.

[0114] The workbench 11 includes a pick-and-place rail 16 for supporting the nail frame; the pick-and-place rail 16 includes a left rail 161 and a right rail 162 extending in the front-rear direction and parallel to each other; the inner side of the right rail 162, i.e., the left side, is provided with a pick-and-place slide rail 17 fixed to the workbench 11, and the pick-and-place slide rail 17 is provided with a pick-and-place slider 18, and the pick-and-place slider 18 is connected to a pick-and-place linear drive device 200 that drives it to move along the pick-and-place slide rail 17. The pick-and-place linear drive device 200 includes a pick-and-place chain 21, an active pick-and-place sprocket 28, a plurality of driven pick-and-place sprockets 29, etc., and the active pick-and-place sprocket 28 is connected to the output shaft of the motor that drives it to rotate. A pick-and-place slider 18 is fixed on the pick-and-place chain 21, and a pick-and-place push-pull block 19 is connected to the pick-and-place slider 18. The pick-and-place push-pull block 19 has a clamping plate 191 extending to the left side into a recess 672 on the connecting block 67; the pick-and-place linear drive device 200 drives the pick-and-place slider 18 to move, and drives the nail frame to move back and forth on the pick-and-place track 16 through the pick-and-place push-pull block 19.

[0115] The workpiece picking and placing station 1 is provided with a clamping device 300 , which is used to press the picking and placing nail frame 2 onto the picking and placing track 16 when the upper top plate 14 pushes the formed parts on the picking and placing nail frame 2 upward.

[0116] The clamping device 300 includes a hook 31 and a pull hook 32; the hook 31 is fixed to the rear end of the workbench 11 and extends forward, and the bottom surface of the hook 31 is flush with the upper surface of the nail frame; the lower end of the pull hook 32 is connected to a movable block 33 that can be moved in the front and rear directions, and the movable block 33 is connected to the piston rod of a clamping cylinder 34 that drives it to move up and down; the cylinder body of the clamping cylinder 34 is fixed on the workbench 11 or the pick-up and place bracket 10.

[0117] When the upper surface of the rear end of the nail frame contacts the hook 31 , the upper surface of the front end of the nail frame contacts the draw hook 32 , thereby pressing the nail frame onto the pick-up and place rail 16 .

[0118] In the hot pressing station 9, the upper mold 91 is connected to the piston rod of the hot pressing cylinder 93 that drives it to move up and down, and the cylinder body of the hot pressing cylinder 93 is set on the hot pressing frame 90; the lifting platform 94 includes a hot pressing track 95 for supporting the nail frame; the hot pressing track 95 includes a left hot pressing track 951 and a right hot pressing track 952 that are parallel to each other and extend in the front and rear directions and are located on the left and right sides of the hot pressing frame 90; the front and rear ends of the left hot pressing track 951 and the right hot pressing track 952 are fixed on a lifting block 96, each lifting block 96 is slidably set on a vertical guide rail 97 fixed on the hot pressing frame 90, and each lifting block 96 is connected to the piston rod of the lifting cylinder 98 set on the hot pressing frame 90.

[0119] The hot pressing station 9 is provided with a pushing device 99, which is used to fix the hot pressing nail frame 4 on the hot pressing track 95 to prevent it from moving forward and backward; the pushing device 99 includes a limit block 991 fixed on the lifting block 96 at the front end to limit the forward movement of the nail frame, a swing push rod 992 set on the lifting block 96 at the rear end to swing forward and backward, the cylinder barrel of the pushing cylinder 993 is hinged on the lifting block 96 at the rear end, and the piston rod of the pushing cylinder 993 is hinged with the swing push rod 992; the pushing cylinder 993 is actuated to drive the swing push rod 992 to swing forward and backward, and when the swing push rod 992 swings forward, the swing push rod 992 can contact with the rear end of the nail frame and push the nail frame forward until the front end of the nail frame contacts the limit block 991. When the swing push rod 992 swings backward and the upper part of the swing push rod 992 is lower than the bottom of the nail frame, the nail frame can move backward.

[0120] The process of the workpiece placement, heating, and hot pressing cycle forming method is as follows: Step a00: When the heating time of the sheet in the heating nail frame 3 located on the upper track is reached, the lifting drive device 400 is activated, driving the left lifting frame 51 and the right lifting frame 52 to descend to a non-heating state.

[0121] Step a0: The heating frame positioning device 800 is actuated, the thrust cylinder drives the thrust rod to retract from the front end of the heating nail frame 3, the clamping cylinder drives the rotating sleeve to move backward, the clamping rod leaves the rear end of the heating nail frame 3, and then the rotating sleeve rotates, driving the clamping rod to swing outward, that is, the heating nail frame 3 with the heated sheet is released from the upper track, so that the heating nail frame 3 can move forward and backward;

[0122] Step a: includes the following steps: a1: the upper linear drive device 600 is actuated, and the upper push-pull block 65 pushes the heating nail frame 3 to move through the clamping block 671, and pushes the heating nail frame 3 with the heated sheet forward from the upper track to the lifting platform 94 until the front end of the nail frame contacts the limit block 991; a2: the pushing device 99 works, and the pushing cylinder 993 is actuated, driving the swing push rod 992 to swing forward and upward, and the swing push rod 992 pushes on the rear end of the hot pressing nail frame 4. At this time, the hot pressing nail frame 4 is clamped between the limit block 991 and the swing push rod 992, and the hot pressing nail frame 4 is fixed on the lifting platform 94 to prevent it from moving forward and backward; a3: the upper disengagement cylinder 74 drives the front end of the upper push-pull block 65 to swing upward, and the clamping block 671 fixed on the hot pressing nail frame 4 is disengaged from the groove of the upper push-pull block 65.

[0123] Step b: includes the following steps: b1: the pick-and-place linear drive device 200 is actuated, the pick-and-place slider 18 and the pick-and-place push-pull block 19 move forward along with the pick-and-place chain, the clamping plate 191 pushes the connecting block 67 and the pick-and-place nail frame 2 to move forward, and the pick-and-place nail frame 2 on the workbench 11 is pushed forward from the pick-and-place station to the upper track of the heating station 5; b2: the heating frame positioning device 800 is actuated, the thrust cylinder drives the thrust rod to move to the left to the front end of the heating nail frame 3, the rotating sleeve and the clamping rod swing inward, the clamping rod is located near the rear end of the heating nail frame 3, and the clamping cylinder drives the rotating sleeve and the clamping rod to move forward, The heating nail frame 3 is clamped front and back by the thrust rod and the clamping rod, that is, the heating nail frame 3 on the upper track is fixed on the upper track to prevent it from moving forward and backward; b3: the upper linear drive device 600 is actuated, driving the upper push-pull block 65 to move backward, and the rear inclined surface of the upper push-pull block 65 contacts the block 671 on the heating nail frame 3, so that the upper push-pull block 65 swings around the pin shaft 71, and the front end of the upper push-pull block 65 gradually moves upward until the block 671 on the heating nail frame 3 enters the groove of the upper push-pull block 65, and the upper push-pull block 65 is in a state where the rotation limit rod 72 contacts the upper slider 63 under the action of the tension spring 73.

[0124] Among them, step a1 and step b1 can be performed simultaneously.

[0125] Step c0: The lifting drive device 400 is activated, driving the left lifting frame 51 and the right lifting frame 52 to rise to the heating state, and the heating plate 55 heats the sheet in the heating nail frame 3 on the upper track. At this time, the card plate 191 of the front pick-up and pull-pull block 19 extends into the concave portion 672 of the connecting block 67 fixed on the hot pressing nail frame 4 on the lower track. In the process of heating the sheet, step c and step d are performed simultaneously before executing step e:

[0126] Step c: including the following steps: c1: the hot pressing frame positioning device 880 is actuated, the thrust cylinder drives the thrust rod to retract from the rear end of the hot pressing nail frame 4, the clamping cylinder drives the rotating sleeve to move forward, the clamping rod leaves the front end of the hot pressing nail frame 4, and then the rotating sleeve rotates, driving the clamping rod to swing outward, that is, the fixation of the hot pressing nail frame 4 on the lower track is released, so that the hot pressing nail frame 4 can move forward and backward on the lower track; the pick-and-place linear drive device 200 is actuated, the pick-and-place slider 18 and the pick-and-place push-pull block 19 move backward with the pick-and-place chain, and the clamping plate 191 pulls the connecting block 67 and the hot pressing nail frame 4 backward Move, pull the hot pressing nail frame 4 with the cooled and formed parts backward from the lower track to the workbench 11 until the nail frame contacts the hook 31; c2: the pressing cylinder 34 first drives the hook 32 and the moving block 33 to move upward, so that the hook 32 exceeds the upper surface of the pick-up and placement nail frame 2, and then the moving block 33 and the hook 32 move backward until the hook 32 is above the upper surface of the pick-up and placement nail frame 2, and then the pressing cylinder 34 drives the hook 32 and the moving block 33 to move downward again, so that the hook 32 contacts the upper surface of the pick-up and placement nail frame 2, and the pick-up and placement nail frame on the workbench 11 2 is fixed on the workbench 11 to prevent the pick-and-place nail frame 2 from moving upward; c3: the upper oil cylinder 15 drives the upper plate 14 to rise, pushes the formed parts upward, and the periphery of the parts is separated from the material nails 101 on the pick-and-place nail frame 2; c4: take out the formed parts; c5: then the upper oil cylinder 15 drives the upper plate 14 to descend; c6: the next sheet to be formed is placed on the pick-and-place nail frame 2 located on the workbench 11, c7: the downward pressure oil cylinder 13 drives the lower pressure plate 12 to descend and press the sheet, and the material nails 101 on the pick-and-place nail frame 2 penetrate into the periphery of the lower part of the sheet ; c8: the pressing cylinder 13 drives the lower pressing plate 12 to rise; c9: the pressing cylinder 34 first drives the hook 32 and the moving block 33 to move upward, so that the hook 32 exceeds the upper surface of the pick-and-place nail frame 2, and then the moving block 33 and the hook 32 move forward, and the hook 32 leaves from above the upper surface of the pick-and-place nail frame 2, and then the pressing cylinder 34 drives the hook 32 and the moving block 33 to move downward again, so that the top of the hook 32 is lower than the lower surface of the pick-and-place nail frame 2, and the fixation of the pick-and-place nail frame 2 on the workbench 11 is released, and it will not hinder the forward movement of the pick-and-place nail frame 2;

[0127] Step d: The hot pressing oil cylinder 93 drives the upper mold 91 to move downward, and the upper mold 91 drives the lifting platform 94 and the hot pressing nail frame 4 on the lifting platform 94 to move downward, close the mold with the lower mold 92, hot press the sheet in the hot pressing nail frame 4, and then cool it;

[0128] Step e: includes the following steps: e1: the hot pressing oil cylinder 93 drives the upper mold 91 to move upward and open the mold; e2: the lifting oil cylinder 98 drives the lifting platform 94 to rise to the nail frame entry and exit position, and the block 671 on the hot pressing nail frame 4 on the lifting platform 94 extends into the groove on the lower push-pull block 66; e3: the pushing device 99 works, and the pushing cylinder 993 moves, driving the swing push rod 992 to swing backward and downward, and the swing push rod 992 leaves the rear end of the hot pressing nail frame 4 and the upper end of the swing push rod 992 is lower than the lower surface of the hot pressing nail frame 4, loosening the fixation of the hot pressing nail frame 4 on the lifting platform 94, and will not cause the hot pressing nail frame 4 to move backward. The lower linear drive device 660 is actuated, and the lower push-pull block 66 pulls the hot press nail frame 4 to move through the clamping block 671, and pulls the hot press nail frame 4 with the cooled and formed parts on the lifting platform 94 backward to the lower track; e4: The hot press frame positioning device 880 is actuated, and the thrust cylinder drives the thrust rod to move to the left to the rear end of the hot press nail frame 4, and the rotating sleeve and the clamping rod swing inward, and the clamping rod is located near the front end of the hot press nail frame 4. The clamping cylinder drives the rotating sleeve and the clamping rod to move backward, and the hot press nail frame 4 is clamped back and forth by the thrust rod and the clamping rod, and the hot press nail frame 4 on the lower track is fixed on the lower track to prevent it from moving back and forth. e5: The lower disengagement cylinder 75 is actuated, driving the lower push-pull block 66 to swing around the pin shaft, and the front end of the lower push-pull block 66 swings upward, and the clamping block 671 fixed on the hot press nail frame 4 is separated from the groove of the lower push-pull block 66. e6: The lower linear drive device 660 is actuated to drive the lower push-pull block 66 to move forward to the front of the lower sliding rail 62. At this time, the groove on the lower push-pull block 66 is aligned with the block 671 on the hot pressing nail frame 4 on the lifting platform 94.

[0129] Below we take a nail frame, nail frame 1, as an example to explain the complete working process of a nail frame. This content is just for easier understanding, so the content of clamping the nail frame or loosening the nail frame is omitted.

[0130] 1. Place the sheet to be formed on the nail frame 1 (in this case, the pick-up and placement nail frame 2) on the workbench 11, and the lower pressing plate 12 moves down to press the sheet, so that the material nails 101 on the nail frame 1 pierce the lower periphery of the sheet;

[0131] 2. The lower pressing plate 12 rises;

[0132] 3. When the heating station 5 is in a non-heating state where the workbench 11 is flush with the upper track, move the nail frame 1 on the workbench 11 from the pick-and-place station to the upper track of the heating station 5;

[0133] 4. The upper track and the lower track rise synchronously, the heating station 5 changes to the heating state, the sheet in the nail frame 1 (heating nail frame 3 at this time) on the upper track approaches the heating plate 55, the heating plate 55 heats the sheet, and the lower track is flush with the workbench 11; another sheet to be formed is placed on the nail frame 2 on the workbench 11, the lower pressing plate 12 descends to press the sheet, and the material nails 101 on the nail frame 2 pierce the lower periphery of the sheet; then the lower pressing plate 12 rises;

[0134] 5. After the heating of the sheet in the nail frame 1 is completed, the heating station 5 is changed to a non-heating state. At the same time, the lifting platform 94 is lifted to the position of entering and exiting the nail frame, and the lifting platform 94 is flush with the upper track;

[0135] 6. Move the nail frame 1 with the heated sheet to the lifting platform 94, and move the nail frame 2 on the workbench 11 from the pick-and-place station to the upper track of the heating station 5;

[0136] 7. The heating station 5 is changed to the heating state, the sheet in the nail frame 2 on the upper track is close to the heating plate 55, the heating plate 55 heats the sheet, and the lower track is flush with the workbench 11; another sheet to be formed is placed on the nail frame 3 on the workbench 11, the lower pressing plate 12 is lowered to press the sheet, and the material nails 101 on the nail frame 3 pierce the lower periphery of the sheet; then the lower pressing plate 12 rises;

[0137] While step 7 is being performed, steps 8-11 are performed;

[0138] 8. The upper mold 91 moves downward, driving the lifting platform 94 and the heated sheet on the lifting platform 94 to move downward, and closes with the lower mold 92 to hot-press the sheet in the nail frame 1 (the hot-press nail frame 4 at this time), and then cools;

[0139] 9. The upper mold 91 moves upward to open the mold;

[0140] 10. The lifting platform 94 rises to the position for entering and exiting the nail frame.

[0141] 11. Move the nail frame 1 (in this case, the hot pressing nail frame 4) with the cooled and formed parts on the lifting platform 94 to the lower track;

[0142] 12. After the heating of the sheet in the nail frame 2 is completed, the heating station 5 is changed to a non-heating state, and the upper track is flush with the lifting platform 94;

[0143] 13. Move the nail frame 2 with the heated sheet to the lifting platform 94, and move the nail frame 3 on the workbench 11 from the pick-and-place station to the upper track of the heating station 5;

[0144] 14. The heating station 5 is changed to the heating state, the sheet in the nail frame 3 on the upper track is close to the heating plate 55, the heating plate 55 heats the sheet, and the lower track is flush with the workbench 11;

[0145] While step 14 is being performed, steps 15-17 are performed;

[0146] 15. Move the nail frame with the cooled and formed parts from the lower track to the workbench 11;

[0147] 16. The upper top plate 14 rises, and pushes the formed parts in the nail frame 1 (the nail frame 2 at this time) upward, and the periphery of the parts is separated from the material nails 101;

[0148] 17. Take out the molded parts; then the upper plate 14 descends.

Claims

1. A method for placing and picking up workpieces, heating, and hot pressing cycle forming, comprising a placing and picking up workpiece station (1), a heating station (5), and a hot pressing station (9), wherein: The workpiece placement station (1) has a workbench (11) for supporting the placement of the nail frame (2), a lower pressing plate (12) which can move up and down relative to the workbench (11) is provided above the workbench (11), and an upper top plate (14) which can move up and down relative to the workbench (11) is provided below the workbench (11); The heating station (5) comprises an upper rail (53) and a lower rail (54) which are arranged up and down and can be raised and lowered synchronously, the upper rail (53) is used to support the heating nail frame (3), the lower rail (54) is used to support the hot pressing nail frame (4), and a heating plate (55) is provided above the upper rail (53); the heating station (5) has two working states: a heating state and a non-heating state; in the non-heating state, the upper rail (53) is flush with the workbench (11), and the upper rail (53) is away from the heating plate (55); in the heating state, the lower rail (54) is flush with the workbench (11), and the upper rail (53) is close to the heating plate (55); The hot pressing station (9) comprises a lower mold (92) fixed at the bottom of a hot pressing frame (90), an upper mold (91) movable up and down relative to the lower mold (92), and a lifting platform (94) located between the upper mold (91) and the lower mold (92) and movable up and down relative to the hot pressing frame (90); the lifting platform (94) is used to support the hot pressing nail frame (4) and can be lifted to a nail frame entry and exit position flush with the workbench (11); There are three nail frames (100) used in the cyclic molding method. The nail frame (100) moved to the workbench (11) is called a pick-and-place nail frame (2), the nail frame (100) moved to the upper track (53) is called a heating nail frame (3), and the nail frame (100) moved to the lifting platform (94) or the lower track (54) is called a hot pressing nail frame (4); each nail frame (100) has material nails (101) arranged in a quadrilateral and extending upward; The material nail (101) is used to pierce the lower periphery of the sheet to be formed, or the lower periphery of the part obtained after the sheet is formed; The heating station (5) changes between a heating state and a non-heating state; When the heating station (5) is in a non-heating state, step a and step b are performed simultaneously or successively: Step a: moving the heating nail frame (3) with the heated sheet forward from the upper track (53) to the lifting platform (94); Step b: moving the nail picking and placing frame (2) on the workbench (11) forward from the picking and placing station to the upper track (53) of the heating station (5); When the heating station (5) is in the heating state and the heating plate (55) is heating the sheet material in the heating nail frame (3) on the upper track (53), step c and step d are performed simultaneously and then step e is performed: Step c: Move the hot pressing nail frame (4) with the cooled and formed parts backward from the lower track (54) to the workbench (11); the upper top plate (14) rises to push the formed parts upward, and the periphery of the parts are separated from the material nails (101); take out the formed parts; then the upper top plate (14) descends; place the next sheet to be formed on the take-and-place nail frame (2) located on the workbench (11), and the lower pressing plate (12) descends to press the sheet downward, and the material nails (101) on the take-and-place nail frame (2) penetrate into the periphery of the lower part of the sheet; the lower pressing plate (12) rises; Step d: the upper mold (91) moves downward, driving the lifting platform (94) and the hot pressing nail frame (4) on the lifting platform (94) to move downward, and close the mold with the lower mold (92), hot pressing the sheet in the hot pressing nail frame (4), and then cooling; Step e: the upper mold (91) moves upward to open the mold; the lifting platform (94) rises to the nail frame entry and exit position, and the hot pressing nail frame (4) with the cooled and formed parts on the lifting platform (94) is moved backward to the lower track (54).

2. The method for placing and picking up workpieces, heating, and hot pressing cycle molding as claimed in claim 1, characterized in that: When the heating station (5) is in a non-heating state, first perform step a0, and then perform step a and step b simultaneously or successively: Step a0: loosening the fixation of the heating nail frame (3) with the heated sheet on the upper track (53) so that the heating nail frame (3) can move forward and backward; Step a: comprises the following steps: a1: moving the heating nail frame (3) with the heated sheet material forward from the upper track (53) to the lifting platform (94); a2: fixing the hot pressing nail frame (4) on the lifting platform (94) to the lifting platform (94) to prevent it from moving forward and backward; Step b: comprising the steps: b1: moving the nail picking and placing frame (2) on the workbench (11) forward from the picking and placing station to the upper track (53) of the heating station (5); b2: Fix the heating nail frame (3) on the upper track (53) to the upper track (53) to prevent it from moving forward and backward; When the heating station (5) is in the heating state and the heating plate (55) is heating the sheet material in the heating nail frame (3) on the upper track (53), step c and step d are performed simultaneously and then step e is performed: Step c: comprising the following steps: c1: loosening the fixation of the hot pressing nail frame (4) on the lower track (54) so ​​that the hot pressing nail frame (4) can move forward and backward on the lower track (54); moving the hot pressing nail frame (4) with the cooled and formed parts backward from the lower track (54) to the workbench (11); c2: Fix the nail picking and placing frame (2) on the workbench (11) on the workbench (11) to prevent it from moving upward; c3: the upper ejector plate (14) rises to eject the formed part upward, and the periphery of the part is separated from the material pins (101); c4: the formed part is taken out; c5: Then the upper top plate (14) descends; c6: placing the next sheet to be formed on the pick-and-place nail frame (2) on the workbench (11); c7: the lower pressing plate (12) descends to press the sheet, and the material nails (101) on the pick-and-place nail frame (2) pierce the lower periphery of the sheet; c8: the lower pressing plate (12) rises; c9: releasing the fixation of the pick-and-place nail frame (2) on the workbench (11); Step d: the upper mold (91) moves downward, driving the lifting platform (94) and the hot pressing nail frame (4) on the lifting platform (94) to move downward, and close the mold with the lower mold (92), hot pressing the sheet in the hot pressing nail frame (4), and then cooling; Step e: comprising the steps of: e1: moving the upper mold (91) upward to open the mold; e2: the lifting platform (94) rises to the nail frame entry and exit position; e3: the hot pressing nail frame (4) is loosened from the lifting platform (94), and the hot pressing nail frame (4) with the cooled and formed parts on the lifting platform (94) is moved backward to the lower track (54); e4: the hot pressing nail frame (4) on the lower track (54) is fixed to the lower track (54) to prevent it from moving forward and backward.

3. The method for placing and picking up workpieces, heating, and hot pressing cycle molding as claimed in claim 1, characterized in that: The heating station (5) has a heating frame (50), and on the left and right sides of the heating frame (50) are respectively provided a left lifting frame (51) and a right lifting frame (52) which slide up and down relative to the heating frame (50); the upper rail (53) and the lower rail (54) each have two left and right rails extending in parallel to the forward and backward moving direction of the nail frame; the left lifting frame (51) is located on the left side, i.e., the outer side, of the upper left rail (531) and the lower left rail (541), and is connected to the upper left rail (531) and the lower left rail (541). ); the right lifting frame (52) is located on the right side, i.e., the outer side, of the upper right rail (532) and the lower right rail (542), and is connected to the upper right rail (532) and the lower right rail (542); the heating plate (55) fixed on the heating frame (50) is above the upper rail and located between the left lifting frame (51) and the right lifting frame (52); a lifting driving device (400) is provided on the top of the heating frame (50) for driving the left lifting frame (51) and the right lifting frame (52) to slide up and down synchronously.

4. The method for placing and picking up workpieces, heating, and hot pressing cycle molding as claimed in claim 3, characterized in that: In the heating station (5), an upper slide rail (61) fixed on the left lifting frame (51) or the right lifting frame (52) is provided on the outer side of the left upper rail (531) or the outer side of the right upper rail (532), and an upper slider (63) is provided on the upper slide rail (61). The upper slider (63) is connected to an upper linear drive device (600) that drives it to move along the upper slide rail (61), and an upper push-pull block (65) is swingably connected to the inner side of the upper slider (63). When the upper push-pull block (65) swings to different positions relative to the upper slider (63), it can be connected to or disconnected from the heating nail frame on the upper rail (53); when the upper push-pull block (65) is connected to the heating nail frame, the upper linear drive device (600) is activated, and the heating nail frame is driven to move forward and backward on the upper rail (53) through the upper slider (63) and the upper push-pull block (65); The outer side of the left lower rail (541) or the outer side of the right lower rail (542) is provided with a lower lower rail (62) fixed on the left lifting frame (51) or the right lifting frame (52); the lower lower rail (62) is provided with a lower slider (64); the lower slider (64) is connected to a lower linear drive device (660) that drives it to move along the lower lower rail (62); the inner side of the lower slider (64) is swingably connected with a lower push-pull block (66); when the lower push-pull block (66) swings to different positions relative to the lower slider (64), it can be connected to or disconnected from the hot pressing nail frame (4); when the lower push-pull block (66) is connected to the hot pressing nail frame (4), the lower linear drive device (660) is activated, and the hot pressing nail frame (4) is driven to move forward and backward on the lower rail through the lower slider (64) and the lower push-pull block (66).

5. The method for placing and picking up workpieces, heating, and hot pressing cycle molding as claimed in claim 3, characterized in that: In the heating station (5), the bottom ends of the upper push-pull block (65) and the lower push-pull block (66) are both provided with grooves extending in the left-right direction, and a block (671) extending upward and capable of extending into the groove is fixed at the rear end of the nail frame (100); when the upper push-pull block (65) swings relative to the upper slider (63) until the block (671) on the heating nail frame (3) extends into the groove of the upper push-pull block (65), the upper linear drive device (600) drives the upper slider (63) moves, and drives the heating nail frame (3) to move forward and backward on the upper track (53) through the upper push-pull block (65); when the lower push-pull block (66) swings relative to the lower slider (64) until the block (671) on the hot pressing nail frame (4) extends into the groove of the lower push-pull block (66), the lower linear drive device (660) drives the lower slider (64) to move, and drives the hot pressing nail frame (4) to move forward and backward on the lower track (54) through the lower push-pull block (66).

6. The method for placing and picking up workpieces, heating, and hot pressing cycle molding as claimed in claim 3, characterized in that: The heating station (5) is provided with a heating frame positioning device (800) for positioning a heating nail frame (3) on an upper rail (53) to prevent the heating nail frame (3) from moving forward and backward on the upper rail (53), and a hot pressing frame positioning device (880) for positioning a hot pressing nail frame (4) on a lower rail (54) to prevent the hot pressing nail frame (4) from moving forward and backward on the lower rail (54); the heating frame positioning device (800) is arranged on the left lifting frame (51) and the right lifting frame (52) in a manner opposite to the upper slide rail (61); the hot pressing frame positioning device (880) is arranged on the left lifting frame (51) and the right lifting frame (52) in a manner opposite to the lower slide rail (62).

7. The method for placing and picking up workpieces, heating, and hot pressing cycle molding as claimed in claim 1, characterized in that: A workpiece picking and placing station (1) is provided with a picking and placing bracket (10), a workbench (11) is arranged on the picking and placing bracket (10), a lower pressure plate (12) is connected to the piston rod of a lower pressure cylinder (13) arranged on the picking and placing bracket (10) and located above the workbench (11), and an upper push plate (14) is connected to the piston rod of an upper push cylinder (15) arranged on the picking and placing bracket (10) and located below the workbench (11).

8. The method for placing and picking up workpieces, heating, and hot pressing cycle molding as claimed in claim 7, characterized in that: One end of the nail frame (100) has a recess (672) extending in the up-down direction; in the workpiece picking and placing station (1), the workbench (11) includes a picking and placing track (16) for supporting the nail frame (100); the picking and placing track (16) includes a left track (161) and a right track (162) extending in the front-back direction and parallel to each other; the inner side of the left track (161), i.e., the right side, or the inner side of the right track (162), i.e., the left side, is provided with a picking and placing slide rail (17) fixed on the workbench (11), and the picking and placing slide rail (17) has a picking and placing slide rail (16) The pick-and-place slider (18) is connected to a pick-and-place linear drive device (200) that drives it to move along the pick-and-place slide rail (17); the pick-and-place slider (18) is connected to a pick-and-place push-pull block (19); the pick-and-place push-pull block (19) has a clamping plate (191) extending laterally into a recess (672) on the nail frame (100); the pick-and-place linear drive device (200) drives the pick-and-place slider (18) to move, and drives the nail frame (100) to move back and forth on the pick-and-place track (16) through the pick-and-place push-pull block (19).

9. The method for placing and picking up workpieces, heating, and hot pressing cycle molding as claimed in claim 9, characterized in that: The workpiece picking and placing station (1) is provided with a clamping device (300), which is used to clamp the picking and placing nail frame (2) onto the picking and placing track (16) when the upper top plate (14) pushes the formed parts on the picking and placing nail frame (2) upward. The clamping device (300) comprises a hook (31) and a draw hook (32); the hook (31) is fixed to the rear end of the workbench (11) and extends forward, and the bottom surface of the hook (31) is flush with the upper surface of the nail frame (100); the lower end of the draw hook (32) is connected to a movable block (33) movable in the front-rear direction, and the movable block (33) is connected to the piston rod of a clamping cylinder (34) that drives it to move up and down; When the upper surface of the rear end of the nail frame (100) contacts the hook (31), the upper surface of the front end of the nail frame (100) contacts the draw hook (32), thereby pressing the nail frame (100) onto the pick-up and placement track (16).

10. The workpiece placement, heating, and hot pressing cycle forming method according to claim 1, characterized in that: In the hot pressing station (9), the upper mold (91) is connected to the piston rod of a hot pressing cylinder (93) that drives it to move up and down, and the cylinder body of the hot pressing cylinder (93) is arranged on the hot pressing frame (90); the lifting platform (94) includes a hot pressing track (95) for supporting the nail frame; the hot pressing track (95) includes a left hot pressing track (951) and a right hot pressing track (952) that are located on the left and right sides of the hot pressing frame (90) and extend in the front and rear directions and are parallel to each other; the front and rear ends of the left hot pressing track (951) and the right hot pressing track (952) are fixed on a lifting block (96), each lifting block (96) is slidably arranged on a vertical guide rail (97) fixed on the hot pressing frame (90), and each lifting block (96) is connected to the piston rod of a lifting cylinder (98) arranged on the hot pressing frame (90).

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