Automatic loading and unloading device for double-head milling machine used for processing rectangular steel plate workpieces

Abstract

The invention discloses an automatic loading and unloading device of a double-head milling machine for processing rectangular steel plate workpieces, comprising a worktable, a preparation table is arranged on both sides of the front of the worktable, a track bracket is arranged on the front of the preparation table, two support columns are arranged on both sides of the top of the worktable, a material transfer track is arranged between the tops of the support columns, a translation slide is arranged on both sides of the material transfer track, a vacuum pump is arranged on one side of the top of the translation slide, a mounting groove is opened in the middle position of the top of the translation slide, a driving component is arranged inside the mounting groove, and a material transfer component is arranged at the bottom of the translation slide; a processing base is arranged in the middle position of the top of the worktable, a CNC milling machine is arranged in the middle position of the front and back of the worktable, and a conveying component is arranged between the preparation table and the top of the worktable. By arranging a material transfer manipulator, a conveying component and a material transfer component, the fully automated loading, transfer and unloading of steel plate workpieces can be realized, thereby greatly improving the efficiency of steel plate workpiece transfer and milling.

Description

Technical Field

[0001] The invention relates to the field of loading and unloading equipment for milling machines, and in particular to an automatic loading and unloading device for a double-head milling machine used for processing rectangular steel plate workpieces. Background Art

[0002] Steel plates are used in various fields of life. After the production of a specific steel plate is completed, its surface sometimes needs to be milled. In mechanical processing, steel plate processing is a common processing form. Before processing, it is generally necessary to move the steel plate to the processing table of the milling machine, and position and tighten the workpiece before processing. In the existing technology, the process of loading and unloading steel plates is generally completed by hoisting. The operation is simple and can meet the general requirements of loading and unloading steel plates. However, it still has the following disadvantages in actual use:

[0003] Before hoisting, the four corners of the workpiece need to be fixed, and then the workpiece is hoisted by a crane. During the hoisting process, the steel plate is in a relatively free state in multiple directions, so there are unstable factors, which are easy to deflect during the hoisting process, which will affect the stability of the hoisting. In addition, after hoisting to the milling machine processing platform, it is still necessary to manually install the steel plate on the fixture, apply a certain pressure to the steel plate to position and fix it, and then manually install the fixture on the milling machine. The operation steps are relatively cumbersome, highly dependent on manual labor, time-consuming and labor-intensive, and affect work efficiency. Therefore, the loading and unloading process of steel plate processing in the prior art takes a long time, affecting the processing progress.

[0004] For example, patent number CN110757225B discloses a steel plate milling machine that can automatically load and unload materials. The milling machine can automatically push materials through the swing of the swing plate, and can automatically load materials through the rotation of the fixture plate. Then, the sliding of the slide plate allows the toothed plate to clamp the steel plate, and then the slide plate is controlled to slide to achieve the milling of the steel plate. It has the advantages of simple structure and convenient operation. However, the milling machine still has certain defects. For example, the steel plate is stored inside the storage tank, which is not conducive to the staff to check the steel plate workpiece at the beginning of processing, and there may be deformed workpieces that affect subsequent processing; and the milling machine does not have complete loading and unloading operations, which has certain limitations.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In view of the problems in the related art, the present invention proposes an automatic loading and unloading device for a double-head milling machine for processing rectangular steel plate workpieces, so as to overcome the above-mentioned technical problems existing in the existing related art.

[0007] To this end, the specific technical solution adopted by the present invention is as follows:

[0008] An automatic loading and unloading device for a double-head milling machine used for processing rectangular steel plate workpieces comprises a workbench, preparation tables are arranged on both sides of the front of the workbench, a track bracket is arranged on the front of the preparation table, two support columns are arranged on both sides of the top of the workbench, a material transfer track is arranged between the tops of the support columns, translation slides are arranged on both sides of the material transfer track, a vacuum pump is arranged on one side of the top of the translation slide, a mounting groove is opened in the middle position of the top of the translation slide, a driving assembly is arranged in the mounting groove, and a material transfer assembly is arranged at the bottom of the translation slide; a processing base is arranged in the middle position of the top of the workbench, CNC milling machines are arranged in the middle positions of the front and back of the workbench, and a conveying assembly is arranged between the preparation table and the top of the workbench; a support driving vehicle is arranged on the top of the track bracket, and a material transfer manipulator is arranged on the top of the support driving vehicle.

[0009] Furthermore, in order to enable the translation slide to be fixed inside the transfer track for horizontal translation movement, limit support strips are provided on both inner side walls of the transfer track, and clamping grooves matching the limit support strips are provided in the middle positions on both sides of the translation slide.

[0010] Furthermore, in order to reduce the friction between the translation slide and the material transfer track while ensuring the support strength between the two, so that the translation slide can slide efficiently, multiple wheel grooves are opened on both sides of the translation slide and at the top and bottom of the clamping groove, and support wheels are arranged inside the wheel grooves on both sides.

[0011] Furthermore, in order to enable the translational slide to move under the drive of the driving motor and the driving wheel and maintain translational sliding inside the material transfer track, the driving assembly includes a driving motor arranged in the middle position inside the installation groove, and driving shafts are arranged on both sides of the driving motor. A driving wheel is arranged at the other end of the driving shaft, and the driving wheel is located inside the middle wheel groove.

[0012] Furthermore, in order to ensure that the translation slides on both sides are limited and fixed when they move to the middle position respectively, and to ensure the movement paths of the translation slides on both sides, it is characterized in that a limit stop strip is provided on the side of the top of the translation slide away from the processing base, and limit stops are provided on the top of the transfer track and on both sides of the CNC milling machine.

[0013] Furthermore, in order to improve the vacuum high pressure environment and realize the suction of the steel plate workpiece, a main air pipe that passes through the translation slide is arranged at the bottom of the vacuum pump.

[0014] Furthermore, in order to be able to achieve the lifting and lowering of the pressure plate through the action of the cylinder, and to drive the surrounding vacuum suction nozzles to be lifted and lowered by the connecting rod movably connected to the pressure plate, so as to realize the functional conversion of the suction and placement of the steel plate workpiece, the material transfer assembly includes a cylinder arranged in the middle position of the bottom of the translation slide, four connecting rods are arranged at the bottom of the translation slide and located outside the circumference of the cylinder, a connecting bottom frame is arranged between the bottoms of the connecting rods, a pressure plate is arranged at the bottom end of the cylinder, a plurality of movable connecting seats are arranged around the top of the pressure plate, a plurality of connecting cylinders are arranged around the connecting bottom frame, the movable connecting seat is movably connected to one end of the connecting rod, the other end of the connecting rod is movably connected to the vacuum suction nozzle, a sliding groove matching the connecting cylinder is opened in the middle position of the connecting rod, and a bronchus is arranged between the vacuum suction nozzle and the main air pipe.

[0015] Furthermore, in order to ensure that the bottom of each vacuum nozzle can be in the same plane and ensure the suction effect on the steel plate workpiece, the number and position of the movable connecting seat and the connecting cylinder correspond one by one, and the distance between each corresponding movable connecting seat and the connecting cylinder is equal.

[0016] Furthermore, in order to be able to transfer the steel plate workpiece on the top of the preparation table to the working area for processing, the conveying assembly includes a conveying bottom box arranged on the top of the preparation table and the working table, a conveyor belt is arranged on one side of the top of the conveying bottom box, and a storage area is arranged on the other side of the top of the conveying bottom box.

[0017] Furthermore, in order to align the steel plate workpiece through the alignment arc plate during the loading process and prevent it from tilting into the workbench and affecting the subsequent transfer processing, the two conveyor bottom boxes are positioned in opposite positions, and the conveyor belt is located on the top of the preparation table. Alignment arc plates are provided on both sides of the conveyor bottom box.

[0018] The beneficial effects of the present invention are:

[0019] 1. By setting up a material transfer manipulator, a conveying component and a material transfer component, the fully automated loading, transferring and unloading of steel plate workpieces can be realized, thereby greatly improving the efficiency of steel plate workpiece transfer and milling processing, and reducing the labor and labor intensity of manual operation; by setting up the working area on both sides of the preparation table and the workbench, the steel plate workpiece can be pre-stored and placed, which is convenient for manual screening and observation, and improves the yield and processing quality of steel plate workpiece processing; the vacuum suction nozzle and the vacuum pump are used to realize the suction and transfer of the steel plate workpiece, avoiding the use of mechanical tightening and other methods, thereby improving the transfer efficiency; at the same time, the linked pressure plate can generate a downward force on the steel plate workpiece, that is, the steel plate workpiece is separated from the vacuum suction nozzle to the surface of the processing base for processing, and the pressure plate can press and fix the steel plate workpiece through the action of the cylinder, so that it is close to the processing base to avoid shaking during processing, thereby improving the processing efficiency.

[0020] 2. Through symmetrical settings, the workbench has the integrated functions of loading and unloading, meeting the complete process of steel plate workpiece processing, reducing the steps of manual participation, and improving the automation and intelligence of processing. That is, through the conveying components set in opposite directions on both sides, the steel plate workpieces can be put in and out of the working area respectively, and at the same time, a certain number of stacks can be formed through the space formed by the storage area, thereby improving the efficiency of loading and unloading; with the straightening arc plate set on one side, the steel plate workpiece on the top can be adjusted and straightened to prevent the steel plate workpiece from being tilted and affecting the subsequent material transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a front structural schematic diagram of an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention;

[0023] Figure 2 2 is a schematic diagram of the back structure of an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a workbench and a preparatory table of an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the main structure of a workbench of an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention;

[0026] Figure 5 It is a structural schematic diagram of a translation slide plate and a material transfer assembly in an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention;

[0027] Figure 6 It is a bottom view of the structure of a translation slide plate and a material transfer assembly in an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention;

[0028] Figure 7 It is a structural schematic diagram of a translation slide and part of a material transfer assembly in an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention;

[0029] Figure 8It is a schematic structural diagram of a feeding assembly in an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention;

[0030] Fig. 9 The invention is a schematic diagram of the structure of a linkage rod in an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece according to an embodiment of the present invention.

[0031] In the figure:

[0032] 1. Workbench; 2. Preparation table; 3. Track bracket; 4. Support column; 5. Transfer track; 6. Translation slide; 7. Vacuum pump; 8. Mounting slot; 9. Drive assembly; 901. Drive motor; 902. Drive shaft; 903. Drive wheel; 10. Transfer assembly; 1001. Cylinder; 1002. Connecting rod; 1003. Connecting bottom frame; 1004. Pressure plate; 1005. Active connecting seat; 1006. Connecting cylinder; 1007. Linking rod; 1 008, vacuum nozzle; 1009, sliding groove; 1010, bronchial tube; 11, processing base; 12, CNC milling machine; 13, conveying assembly; 1301, conveying bottom box; 1302, conveyor belt; 1303, storage area; 1304, arc plate alignment; 14, support drive vehicle; 15, material transfer robot; 16, limit support strip; 17, clamping groove; 18, wheel groove; 19, support wheel; 20, limit stop strip; 21, limit stop block; 22, main air pipe. DETAILED DESCRIPTION

[0033] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0034] According to an embodiment of the present invention, an automatic loading and unloading device of a double-head milling machine for processing a rectangular steel plate workpiece is provided.

[0035] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 9As shown, an automatic loading and unloading device for a double-head milling machine for processing rectangular steel plate workpieces according to an embodiment of the present invention includes a workbench 1, a preparation table 2 is provided on both sides of the front of the workbench 1, a track bracket 3 is provided on the front of the preparation table 2, two support columns 4 are provided on both sides of the top of the workbench 1, a material transfer track 5 is provided between the tops of the support columns 4, translation slides 6 are provided on both sides of the inside of the material transfer track 5, a vacuum pump 7 is provided on one side of the top of the translation slide 6, an installation groove 8 is opened in the middle position of the top of the translation slide 6, a driving component 9 is provided inside the installation groove 8, and a material transfer component 10 is provided at the bottom of the translation slide 6; a processing base 11 is provided in the middle position of the top of the workbench 1, a CNC milling machine 12 is provided in the middle position of the front and back of the workbench 1, and a conveying component 13 is provided between the preparation table 2 and the top of the workbench 1; a support driving vehicle 14 is provided on the top of the track bracket 3, and a material transfer manipulator 15 is provided on the top of the support driving vehicle 14.

[0036] With the help of the above technical solution, by setting the material transfer manipulator 15, the conveying component 13 and the material transfer component 10, the fully automated loading, transferring and unloading of steel plate workpieces can be realized, thereby greatly improving the efficiency of steel plate workpiece transfer and milling processing, and reducing the labor and labor intensity of manual operation; by setting the working area on both sides of the preparation table 2 and the workbench 1, the steel plate workpieces can be pre-stored and placed, which is convenient for manual screening and observation, and improves the yield and processing quality of steel plate workpiece processing. Through the symmetrical setting, the workbench 1 has the integrated function of loading and unloading at the same time, meets the complete process of steel plate workpiece processing, reduces the steps of manual participation, and improves the automation and intelligence of processing.

[0037] In one embodiment, for the above-mentioned material transfer track 5, both inner side walls of the material transfer track 5 are provided with limiting support strips 16, and the middle positions on both sides of the translation slide 6 are provided with clamping grooves 17 that cooperate with the limiting support strips 16, and both sides of the translation slide 6 and at the top and bottom of the clamping grooves 17 are provided with multiple wheel grooves 18, and support wheels 19 are arranged inside the wheel grooves 18 on both sides, so that the translation slide 6 can be fixed inside the material transfer track 5 for horizontal translation movement, while reducing the friction between the translation slide 6 and the material transfer track 5 while ensuring the support strength between the two, so that the translation slide 6 can efficiently perform translational sliding.

[0038] In one embodiment, for the above-mentioned driving component 9, the driving component 9 includes a driving motor 901 arranged in the middle position inside the mounting groove 8, and driving shafts 902 are arranged on both sides of the driving motor 901. A driving wheel 903 is arranged at the other end of the driving shaft 902, and the driving wheel 903 is located inside the middle wheel groove 18, so that the translation slide 6 can move under the drive of the driving motor 901 and the driving wheel 903, and maintain translational sliding inside the material transfer track 5.

[0039] In one embodiment, for the above-mentioned translation slide 6, a limit stop bar 20 is set on the side of the top of the translation slide 6 away from the processing base 11, and limit stop blocks 21 are set on the top of the transfer track 5 and on both sides of the CNC milling machine 12, so that the translation slides 6 on both sides are limited and fixed when they move to the middle position, thereby ensuring the movement path of the translation slides 6 on both sides.

[0040] In one embodiment, for the above-mentioned vacuum pump 7, a main air pipe 22 that penetrates the translation slide 6 is arranged at the bottom of the vacuum pump 7, and the material transfer assembly 10 includes a cylinder 1001 arranged at the middle position of the bottom of the translation slide 6, and four connecting rods 1002 are arranged at the bottom of the translation slide 6 and outside the circumference of the cylinder 1001, and a connecting bottom frame 1003 is arranged between the bottoms of the connecting rods 1002, and a pressure plate 1004 is arranged at the bottom of the cylinder 1001, and a plurality of movable connecting seats 1005 are arranged around the top of the pressure plate 1004, and a plurality of connecting cylinders 1006 are arranged around the connecting bottom frame 1003, and the movable connecting seats 1005 and the linkage rods are connected. One end of 1007 remains movably connected, and the other end of the connecting rod 1007 is movably connected to a vacuum suction nozzle 1008. A sliding groove 1009 that cooperates with the connecting cylinder 1006 is provided in the middle position of the connecting rod 1007. A bronchial tube 1010 is provided between the vacuum suction nozzle 1008 and the main air pipe 22, thereby improving the vacuum high-pressure environment and realizing the suction of the steel plate workpiece. The pressure plate 1004 can be lifted and lowered through the action of the cylinder 1001, and the surrounding vacuum suction nozzles 1008 can be driven to lift and lower through the connecting rod 1007 movably connected to the pressure plate 1004, thereby realizing the functional conversion of the suction and placement of the steel plate workpiece.

[0041] In one embodiment, for the above-mentioned movable connecting seat 1005, the number and position of the movable connecting seat 1005 and the connecting cylinder 1006 correspond one to one, and the distance between each corresponding movable connecting seat 1005 and the connecting cylinder 1006 is equal, thereby ensuring that the bottom of each vacuum suction nozzle 1008 can be in the same plane, ensuring the suction effect on the steel plate workpiece.

[0042] In one embodiment, for the above-mentioned conveying component 13, the conveying component 13 includes a conveying base box 1301 arranged on the top of the preparation table 2 and the workbench 1, a conveyor belt 1302 is arranged on one side of the top of the conveying base box 1301, and a storage area 1303 is arranged on the other side of the top of the conveying base box 1301, and the two conveying base boxes 1301 are in opposite positions, and the conveyor belt 1302 is located on both sides of the conveying base box 1301 on the top of the preparation table 2. Straightening arc plates 1304 are arranged, so that the steel plate workpiece on the top of the preparation table 2 can be transferred to the working area for processing, and the steel plate workpiece can be straightened by the straightening arc plate 1304 during the loading process to prevent it from tilting into the workbench and affecting the subsequent transfer processing.

[0043] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below.

[0044] In actual application, the material transfer robot 15 is located in the loading area, and picks up the steel plate workpiece in the tray to the top of the preparation table 2 through its own operation, that is, places it on the top of the conveyor belt 1302. At this time, the conveyor belt 1302 stops running, and the staff can check the steel plate workpiece to see if there is any deformed workpiece. After the inspection is correct, the conveyor belt 1302 is driven to make the steel plate workpiece enter the storage area 1303, that is, the top of the workbench 1, waiting for the transfer of the material transfer assembly 10. When transferring, the translation slide 6 runs to the top of the storage area 1303, at this time the cylinder 1001 shrinks, and the surrounding linkage rods 1007 rotate around the connecting cylinder 1006, that is, the vacuum nozzle 1008 moves downward until it contacts the steel plate workpiece, and the vacuum pump 7 is driven to evacuate and pressurize to achieve the suction and lifting of the steel plate workpiece. After that, the length of the cylinder 1001 can be adjusted to a certain extent to make the vacuum nozzle 1008 rise in height. Then the driving motor 901 is operated to drive the translation slide 6 to the middle position of the material transfer track 5. At this time, the cylinder 1001 is adjusted to extend, and the vacuum pump 7 is controlled to deflate. During the downward pressing process of the pressure plate 1004, the steel plate workpiece is contacted and gradually contacted with the processing base 11. The pressure plate 1004 can continue to pressurize it to improve stability, and cooperate with the clamping equipment inside the processing base 11 to complete the close fixation. Until the milling process is completed by the CNC milling machine 12. After the processing is completed, the translation slide 6 and the material transfer assembly 10 on the other side are driven in reverse to complete the material unloading.

[0045] In summary, with the aid of the above-mentioned technical scheme of the present invention, by setting up a material transfer robot 15, a conveying assembly 13 and a material transfer assembly 10, it is possible to realize fully automated loading, transferring and unloading of steel plate workpieces, thereby greatly improving the efficiency of transferring and milling processing of steel plate workpieces, and reducing the labor and labor intensity of manual operation; by setting up working areas on both sides of the preparation table 2 and the workbench 1, it is possible to pre-store and place steel plate workpieces, which is convenient for manual screening and observation, and improves the yield and processing quality of steel plate workpiece processing; the vacuum suction nozzle 1008 and the vacuum pump 7 are used to realize the suction and transfer of the steel plate workpiece, avoiding the use of mechanical tightening and the like, thereby improving the transfer efficiency; at the same time, the linked pressure plate 1004 is used to generate a downward force on the steel plate workpiece, that is, the steel plate workpiece is separated from the vacuum suction nozzle 1008 to the surface of the processing base 11 for processing, and the pressure plate can press and fix the steel plate workpiece through the action of the cylinder 1001, so that it is close to the processing base 11 to avoid shaking during the processing, thereby improving the processing efficiency. Through the symmetrical arrangement, the workbench 1 has the integrated function of loading and unloading at the same time, meets the complete process of steel plate workpiece processing, reduces the steps of manual participation, and improves the automation and intelligence of processing. That is, through the conveying components 13 arranged in opposite directions on both sides, the steel plate workpieces can be respectively put in and out of the working area, and at the same time, a certain number of stacks can be formed through the space formed by the storage area 1303, thereby improving the efficiency of loading and unloading; with the alignment arc plate 1304 arranged on one side, the top steel plate workpiece can be adjusted and aligned to prevent the steel plate workpiece from being tilted and affecting the subsequent material transfer.

[0046] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic loading and unloading device for a double-head milling machine for processing rectangular steel plate workpieces, comprising a workbench (1), a preparation table (2) being arranged on both sides of the front of the workbench (1), and a track bracket (3) being arranged on the front of the preparation table (2), characterized in that: Two support columns (4) are provided on both sides of the top of the workbench (1); a material transfer track (5) is provided between the tops of the support columns (4); translation slides (6) are provided on both sides of the inside of the material transfer track (5); a vacuum pump (7) is provided on one side of the top of the translation slide (6); a mounting groove (8) is provided in the middle of the top of the translation slide (6); a driving assembly (9) is provided inside the mounting groove (8); and a material transfer assembly (10) is provided at the bottom of the translation slide (6); A processing base (11) is provided in the middle of the top of the workbench (1), a CNC milling machine (12) is provided in the middle of the front and back of the workbench (1), and a conveying assembly (13) is provided between the preparation table (2) and the top of the workbench (1); A support driving vehicle (14) is arranged on the top of the track bracket (3), and a material transfer robot (15) is arranged on the top of the support driving vehicle (14); Both inner side walls of the transfer track (5) are provided with limit support strips (16), and both sides of the translation slide plate (6) are provided with clamping grooves (17) matching with the limit support strips (16) at the middle positions; A main air pipe (22) penetrating the translation slide (6) is provided at the bottom of the vacuum pump (7); The material transfer assembly (10) comprises a cylinder (1001) arranged at the middle position of the bottom of the translation slide (6); four connecting rods (1002) are arranged at the bottom of the translation slide (6) and outside the circumference of the cylinder (1001); a connecting bottom frame (1003) is arranged between the bottoms of the connecting rods (1002); a pressure plate (1004) is arranged at the bottom end of the cylinder (1001); a plurality of movable connecting seats (1005) are arranged around the top of the pressure plate (1004); A plurality of connecting cylinders (1006) are arranged around the bottom frame (1003); the movable connecting seat (1005) is movably connected to one end of a connecting rod (1007); the other end of the connecting rod (1007) is movably connected to a vacuum suction nozzle (1008); a sliding groove (1009) matching with the connecting cylinder (1006) is provided in the middle of the connecting rod (1007); and a bronchus (1010) is arranged between the vacuum suction nozzle (1008) and the main airway (22); When the translation slide (6) moves to the middle position of the transfer track (5), the cylinder (1001) is adjusted to extend, and the vacuum pump (7) is controlled to deflate. During the downward pressing process of the pressure plate (1004), the steel plate workpiece is contacted, and the steel plate workpiece is gradually brought into contact with the processing base (11). The pressure plate (1004) can be continuously pressed downward to pressurize the steel plate workpiece, and cooperate with the clamping device inside the processing base (11) to complete the close fixation.

2. The automatic loading and unloading device of a double-head milling machine for processing rectangular steel plate workpieces according to claim 1 is characterized in that: A plurality of wheel grooves (18) are provided on both sides of the translation slide plate (6) and at the top and bottom of the clamping groove (17), and support wheels (19) are provided inside the wheel grooves (18) located on both sides.

3. The automatic loading and unloading device of a double-head milling machine for processing rectangular steel plate workpieces according to claim 2 is characterized in that: The driving assembly (9) comprises a driving motor (901) arranged in the middle position inside the mounting groove (8), driving shafts (902) are arranged on both sides of the driving motor (901), and a driving wheel (903) is arranged at the other end of the driving shaft (902), and the driving wheel (903) is located inside the middle wheel groove (18).

4. The automatic loading and unloading device of a double-head milling machine for processing rectangular steel plate workpieces according to claim 1, 2 or 3, characterized in that: A limit stop bar (20) is provided on the top of the translation slide (6) on a side away from the processing base (11), and limit stop blocks (21) are provided on the top of the material transfer track (5) and on both sides of the CNC milling machine (12).

5. The automatic loading and unloading device of a double-head milling machine for processing rectangular steel plate workpieces according to claim 1 is characterized in that: The number and position of the movable connection seat (1005) and the connection cylinder (1006) correspond one to one, and the distance between each corresponding movable connection seat (1005) and the connection cylinder (1006) is equal.

6. The automatic loading and unloading device of a double-head milling machine for processing rectangular steel plate workpieces according to claim 1 is characterized in that: The conveying assembly (13) comprises a conveying bottom box (1301) arranged on the top of the preparation table (2) and the workbench (1), a conveying belt (1302) being arranged on one side of the top of the conveying bottom box (1301), and a storage area (1303) being arranged on the other side of the top of the conveying bottom box (1301).

7. The automatic loading and unloading device of a double-head milling machine for processing rectangular steel plate workpieces according to claim 6 is characterized in that: The two conveying bottom boxes (1301) are located in opposite positions, and both sides of the conveying bottom box (1301) where the conveyor belt (1302) is located on the top of the preparation table (2) are provided with straightening arc plates (1304).

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