Four-column mold table with stroke adjusting function

Abstract

The invention relates to the technical field of mold tables, and discloses a four-column mold table with a stroke adjusting function, the four-column mold table comprises a lower fixed plate, a top frame, a lower movable plate, a stroke adjusting assembly, an upper fixed plate and an upper movable plate, four guide columns are fixedly installed between the lower fixed plate and the top frame, the upper movable plate and the lower movable plate are sequentially connected outside the guide columns in a sliding and sleeving mode from top to bottom, and the stroke adjusting assembly is arranged between the upper fixed plate and the lower movable plate. The top of the guide column is a threaded part, a threaded tooth sleeve is rotationally connected into the upper fixing plate, the top of the guide column is sleeved with the threaded tooth sleeve in a threaded mode, a driving assembly used for driving the threaded tooth sleeve to rotate is arranged on the upper fixing plate, and a lower crank arm assembly is arranged between the lower fixing plate and the lower movable plate. According to the mold closing distance adjusting mechanism, the mold closing distance between the lower movable plate and the upper movable plate can be finely adjusted conveniently, the situation that the mold closing distance is prone to large adjusting errors is prevented, and accurate adjusting operation of the mold closing distance is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of mold platforms, and more specifically, to a four-column mold platform with a stroke adjustment function. Background Art

[0002] A mold is a tool that uses a specific shape to form a blank (solid or liquid) into a product with a certain shape and size under the action of an external force. The mold is extremely widely used in forging, stamping, powder metallurgy pressing, pressure casting, and compression molding, vacuum molding, and injection molding of engineering plastics, rubber, ceramics, and other products. When the molding mold is used, a mold table must be provided, and the molding mold is locked and the opening and closing movement is controlled through the mold table. If the mold table encounters product molds of different specifications when in use, it is necessary to accurately adjust the mold distance between the two moving plates. However, due to the structural and functional limitations of the existing mold table, the travel range of the moving plate cannot be adjusted, which makes it difficult to fine-tune the mold distance between the two moving plates. The mold distance is prone to large adjustment errors, which brings inconvenience to the precise adjustment operation of the mold distance and affects the convenience of using the mold table. In view of this, we propose a four-column mold table with a travel adjustment function to solve the above problems. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a four-column mold platform with a stroke adjustment function to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket.

[0005] As a preferred technical solution of the present invention, the lower crank arm assembly includes a lower reduction motor, a first connecting rod and a second connecting rod. The lower reduction motor is fixedly installed on the outer side of the lower fixed plate, and the output shaft of the lower reduction motor is fixedly connected to the lower transmission shaft. The lower transmission shaft is fixedly sleeved with a lower eccentric wheel on the outside, and the lower eccentric wheel is rotatably sleeved with a lower cam on the outside. The first connecting rod is movably hinged to the upper end of the lower fixed plate, the second connecting rod is movably hinged to the upper end of the first connecting rod, and one end of the lower cam is movably hinged to the inner side of the first connecting rod.

[0006] As a preferred technical solution of the present invention, the stroke adjustment component includes an adjusting reduction motor, a transmission sprocket, a positioning stud, a transmission nut and a driven sprocket. The adjusting reduction motor is fixedly installed on the outer side of the lower moving plate, the transmission sprocket is fixedly connected to the output shaft of the adjusting reduction motor, the driven sprocket is rotatably connected to the bottom of the lower moving plate, the transmission nut threaded teeth are sleeved on the outside of the positioning stud, the transmission nut is rotatably connected to the bottom of the lower moving plate through a bearing, the transmission nut is fixedly sleeved on the outside of the transmission nut with a linkage sprocket, the positioning stud is fixedly connected to the upper end of the second connecting rod through an assembly seat, and the transmission sprocket is connected to the driven sprocket and the linkage sprocket through a linkage chain transmission.

[0007] As a preferred technical solution of the present invention, the driving assembly includes a transmission chain, a lifting motor and a guide sprocket. The lifting motor is fixedly mounted on an upper fixed plate, the guide sprocket is fixedly connected to the output shaft of the lifting motor, and the guide sprocket is connected to the threaded gear sleeve through a transmission chain.

[0008] As a preferred technical solution of the present invention, two lower auxiliary cylinders are symmetrically fixedly installed on the lower fixed plate, and the telescopic ends of the lower auxiliary cylinders are fixedly connected to the bottom of the lower moving plate through lower vertical rods.

[0009] As a preferred technical solution of the present invention, the upper end of the lower fixed plate is rotatably connected to the lower transverse axis, both ends of the lower transverse axis are movably hinged with lower linkage side rods, and a lower movable rod is movably hinged between the lower linkage side rod and the lower vertical rod.

[0010] As a preferred technical solution of the present invention, the upper crank arm assembly includes an upper reduction motor, a third connecting rod and a fourth connecting rod. The upper reduction motor is fixedly installed on the outer side of the upper fixed plate. The output shaft of the upper reduction motor is fixedly connected to the upper transmission shaft. The upper transmission shaft is fixedly sleeved with an upper eccentric wheel on the outside. The upper eccentric wheel is rotatably sleeved with an upper cam on the outside. The third connecting rod is movably hinged at the bottom of the upper fixed plate, the fourth connecting rod is movably hinged between the upper movable plate and the third connecting rod, and one end of the upper cam is movably hinged to the inner side of the third connecting rod.

[0011] As a preferred technical solution of the present invention, a support I is fixedly installed on one side of the lower fixed plate close to the lower transmission shaft, and the support I is rotatably sleeved on the outside of the lower transmission shaft. A support II is fixedly installed on one side of the upper fixed plate close to the upper transmission shaft, and the support II is rotatably sleeved on the outside of the upper transmission shaft.

[0012] As a preferred technical solution of the present invention, two upper auxiliary cylinders are symmetrically fixedly installed on the upper fixed plate, and the telescopic ends of the upper auxiliary cylinders are fixedly connected to the upper end of the upper moving plate through upper vertical rods.

[0013] As a preferred technical solution of the present invention, the bottom end of the upper fixed plate is rotatably connected to the upper horizontal axis, both ends of the upper horizontal axis are movably hinged with upper linkage side rods, and upper movable rods are movably hinged between the upper linkage side rods and the upper vertical rods.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention drives the lower movable plate to move up and down reciprocatingly by the lower crank arm assembly, and drives the upper movable plate to move up and down reciprocatingly by the upper crank arm assembly, so that the lower movable plate and the upper movable plate perform mold closing and mold opening actions. According to the use requirements of molds of products with different specifications, if it is necessary to accurately adjust the mold closing distance between the lower movable plate and the upper movable plate, a lifting motor is used to drive the guide sprocket to rotate, and the threaded tooth sleeve can be driven to rotate through the transmission chain, so that the upper fixed plate and the upper movable plate can be driven to slide to a required height position along the guide column, so as to roughly adjust the mold closing distance between the lower movable plate and the upper movable plate, and an adjusting reduction motor is used to drive the transmission sprocket to rotate, and the linkage chain and the driven sprocket are used to drive each transmission screw sleeve to rotate synchronously, so that the positioning stud and the assembly seat are lifted and lowered, and the first connecting rod and the second connecting rod are driven to cooperate with the bending and stretching activities, so that the stroke range of the lower movable plate can be adjusted, so as to fine-tune the mold closing distance between the lower movable plate and the upper movable plate, prevent the mold closing distance from being prone to large adjustment errors, make the precise adjustment operation of the mold closing distance more convenient, and help improve the convenience and reliability of the mold table.

[0015] 2. The present invention provides a tightening cylinder to generate an upward pulling force on the upper fixed plate to eliminate the thread gap between the threaded sleeve and the guide column, thereby avoiding impact when the lower movable plate and the upper movable plate perform mold closing and mold opening actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of a four-column mold platform with a stroke adjustment function of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of a lower fixed plate and a lower movable plate in a four-column mold platform with a stroke adjustment function according to the present invention from a first perspective; Figure 3It is a bottom view structural schematic diagram of a lower movable plate in a four-column die table with a stroke adjustment function according to the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of a lower fixed plate and a lower movable plate in a four-column mold platform with a stroke adjustment function according to the present invention from a second viewing angle; Figure 5 It is a schematic diagram of the three-dimensional structure of an upper fixed plate and an upper movable plate in a four-column mold platform with a stroke adjustment function according to the present invention from a first perspective; Figure 6 It is a schematic diagram of the third perspective structure of an upper fixed plate and an upper movable plate in a four-column mold platform with a stroke adjustment function according to the present invention; Figure 7 The present invention is a three-dimensional structural schematic diagram of a four-column mold platform with a stroke adjustment function.

[0017] In the figure: 1, lower fixed plate; 101, guide column; 102, lower auxiliary cylinder; 103, lower vertical rod; 104, lower horizontal axis; 105, lower linkage side rod; 106, lower movable rod; 2, top frame; 3, lower movable plate; 4, lower crank arm assembly; 401, lower reduction motor; 402, first connecting rod; 403, second connecting rod; 404, lower transmission shaft; 405, lower eccentric wheel; 406, lower cam; 5, stroke adjustment assembly; 501, adjustment reduction motor; 502, transmission sprocket; 503, positioning stud; 504, transmission screw sleeve; 505, driven chain Wheel; 506, bearing; 507, linkage sprocket; 508, assembly seat; 6, upper fixed plate; 601, tightening cylinder; 602, upper auxiliary cylinder; 603, upper vertical rod; 604, upper horizontal axis; 605, upper linkage side rod; 606, threaded tooth sleeve; 607, transmission chain; 608, lifting motor; 609, guide sprocket; 7, linkage chain; 8, upper moving plate; 9, upper crank arm assembly; 901, upper reduction motor; 902, third connecting rod; 903, fourth connecting rod; 904, upper transmission shaft; 905, upper eccentric wheel; 906, upper cam. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “longitudinal”, “lateral”, “upper”, “lower”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] like Figures 1 to 7 As shown, the present invention provides a four-column die table with a stroke adjustment function, including a lower fixed plate 1, a top frame 2, a lower movable plate 3, a stroke adjustment assembly 5, an upper fixed plate 6 and an upper movable plate 8. Four guide pillars 101 are fixedly installed between the lower fixed plate 1 and the top frame 2. The upper movable plate 8 and the lower movable plate 3 are slidably sleeved on the outside of the guide pillars 101 from top to bottom in sequence. The top of the guide pillar 101 is a threaded portion. The upper fixed plate 6 is rotatably connected to a threaded sleeve 606. The threaded sleeve 606 is threadedly sleeved on the outside of the top of the guide pillar 101. The upper fixed plate 6 is provided with a threaded sleeve for driving the threaded sleeve 606 is a driving component for rotation, a tightening cylinder 601 is fixedly installed on the upper fixed plate 6, the telescopic end of the tightening cylinder 601 is fixedly connected to the bottom of the top frame 2, the tightening cylinder 601 is used to generate a force to eliminate the thread gap between the threaded sleeve 606 and the guide column 101, a lower crank arm assembly 4 is arranged between the lower fixed plate 1 and the lower movable plate 3, a stroke adjustment assembly 5 is arranged between the lower movable plate 3 and the lower crank arm assembly 4, the stroke adjustment assembly 5 is used to adjust the stroke range of the lower movable plate 3, and an upper crank arm assembly 9 is arranged between the upper fixed plate 6 and the upper movable plate 8.

[0021] Among them, Figure 2 As shown, the lower crank arm assembly 4 includes a lower reduction motor 401, a first connecting rod 402 and a second connecting rod 403. The lower reduction motor 401 is fixedly installed on the outer side of the lower fixed plate 1. The output shaft of the lower reduction motor 401 is fixedly connected to the lower transmission shaft 404. The lower transmission shaft 404 is fixedly sleeved with a lower eccentric wheel 405 on the outside. The lower eccentric wheel 405 is rotatably sleeved with a lower cam 406 on the outside. The first connecting rod 402 is movably hinged to the upper end of the lower fixed plate 1, the second connecting rod 403 is movably hinged to the upper end of the first connecting rod 402, and one end of the lower cam 406 is movably hinged to the inner side of the first connecting rod 402. When the lower reduction motor 401 is used to drive the lower eccentric wheel 405 to rotate, the lower cam 406 can be driven to swing.

[0022] Among them, Figure 2 and Figure 3As shown, the stroke adjustment component 5 includes an adjustment reduction motor 501, a transmission sprocket 502, a positioning stud 503, a transmission screw sleeve 504 and a driven sprocket 505. The adjustment reduction motor 501 is fixedly installed on the outer side of the lower movable plate 3, the transmission sprocket 502 is fixedly connected to the output shaft of the adjustment reduction motor 501, the driven sprocket 505 is rotatably connected to the bottom of the lower movable plate 3, the transmission screw sleeve 504 threaded teeth are sleeved on the outside of the positioning stud 503, the transmission screw sleeve 504 is rotatably connected to the bottom of the lower movable plate 3 through a bearing 506, the transmission screw sleeve 504 is fixedly sleeved with a linkage sprocket 507, the positioning stud 503 is fixedly connected to the upper end of the second connecting rod 403 through an assembly seat 508, and the first The connecting rod member 402 and the second connecting rod member 403 enable the swinging lower cam 406 to drive the lower moving plate 3 to move up and down reciprocatingly. The transmission sprocket 502 is connected to the driven sprocket 505 and the linkage sprocket 507 through the linkage chain 7. The tooth height of the driven sprocket 505 is smaller than the tooth groove height of the linkage chain 7, ensuring that the driven sprocket 505 can slide up and down along the linkage chain 7. The drive sprocket 502 is driven to rotate by the adjustment reduction motor 501, and the linkage chain 7 and the driven sprocket 505 are used to drive each transmission nut 504 to rotate synchronously, so that the positioning stud 503 and the assembly seat 508 are lifted and lowered, driving the first connecting rod member 402 and the second connecting rod member 403 to cooperate in bending and stretching.

[0023] Among them, Figure 7 As shown, the driving assembly includes a transmission chain 607, a lifting motor 608 and a guide sprocket 609. The lifting motor 608 is fixedly mounted on the upper fixed plate 6. The guide sprocket 609 is fixedly connected to the output shaft of the lifting motor 608. The guide sprocket 609 is connected to the threaded tooth sleeve 606 through the transmission chain 607. The lifting motor 608 is used to drive the guide sprocket 609 to rotate, and the threaded tooth sleeve 606 can be driven to rotate through the transmission chain 607.

[0024] Among them, Figure 4 As shown, two lower auxiliary cylinders 102 are symmetrically fixedly installed on the lower fixed plate 1, and the telescopic ends of the lower auxiliary cylinders 102 are fixedly connected to the bottom of the lower movable plate 3 through the lower vertical rods 103. The lower auxiliary cylinders 102 can provide a good auxiliary buffering effect when the lower movable plate 3 moves back and forth up and down.

[0025] Among them, Figure 4 As shown, the upper end of the lower fixed plate 1 is rotatably connected to the lower transverse axis 104, both ends of the lower transverse axis 104 are movably hinged with lower linkage side rods 105, and a lower movable rod 106 is movably hinged between the lower linkage side rods 105 and the lower vertical rods 103, thereby achieving the purpose of enhancing the structural correlation between the two lower vertical rods 103.

[0026] Among them, Figure 5As shown, the upper crank arm assembly 9 includes an upper reduction motor 901, a third connecting rod 902 and a fourth connecting rod 903. The upper reduction motor 901 is fixedly installed on the outer side of the upper fixed plate 6. The output shaft of the upper reduction motor 901 is fixedly connected to the upper transmission shaft 904. The upper transmission shaft 904 is fixedly sleeved with an upper eccentric wheel 905 on the outside. The upper eccentric wheel 905 is rotatably sleeved with an upper cam 906 on the outside. The third connecting rod 902 is movably hinged at the bottom of the upper fixed plate 6. The fourth connecting rod 903 is movably hinged between the upper movable plate 8 and the third connecting rod 902. One end of the upper cam 906 is movably hinged to the inner side of the third connecting rod 902. When the upper reduction motor 901 is used to drive the upper eccentric wheel 905 to rotate, the upper cam 906 can be driven to swing. The third connecting rod 902 and the fourth connecting rod 903 are used to make the swinging upper cam 906 drive the upper movable plate 8 to move reciprocatingly up and down.

[0027] Among them, Figure 2 and Figure 5 As shown, a support I is fixedly installed on one side of the lower fixed plate 1 close to the lower transmission shaft 404, and the support I is rotatably sleeved on the outside of the lower transmission shaft 404. A support II is fixedly installed on one side of the upper fixed plate 6 close to the upper transmission shaft 904, and the support II is rotatably sleeved on the outside of the upper transmission shaft 904.

[0028] Among them, Figure 6 As shown, two upper auxiliary cylinders 602 are symmetrically fixedly installed on the upper fixed plate 6. The telescopic ends of the upper auxiliary cylinders 602 are fixedly connected to the upper end of the upper movable plate 8 through the upper vertical rods 603. The upper auxiliary cylinders 602 can play a good auxiliary guiding and limiting effect on the upper movable plate 8 when it moves back and forth up and down.

[0029] Among them, Figure 6 As shown, the bottom end of the upper fixed plate 6 is rotatably connected to the upper horizontal axis 604, and both ends of the upper horizontal axis 604 are movably hinged with upper linkage side rods 605, and an upper movable rod is movably hinged between the upper linkage side rods 605 and the upper vertical rods 603, thereby achieving the purpose of enhancing the structural correlation between the two upper vertical rods 603.

[0030] Working principle of the present invention: When using the four-column mold platform with stroke adjustment function, when the lower reduction motor 401 is used to drive the lower eccentric wheel 405 to rotate, the lower cam 406 can be driven to swing, and the first connecting rod 402 and the second connecting rod 403 are used to make the swinging lower cam 406 drive the lower movable plate 3 to move up and down reciprocatingly. When the upper reduction motor 901 is used to drive the upper eccentric wheel 905 to rotate, the upper cam 906 can be driven to swing, and the third connecting rod 902 and the fourth connecting rod 903 are used to make the swinging upper cam 906 drive the upper movable plate 8 to move up and down reciprocatingly, so that the lower movable plate 3 and the upper movable plate 8 perform mold closing and mold opening actions. According to the use requirements of molds of different specifications of products, if it is necessary to accurately adjust the mold closing distance between the lower movable plate 3 and the upper movable plate 8, the lifting motor 608 is used to drive the guide sprocket 609 to rotate, and the threaded tooth sleeve 60 can be driven by the transmission chain 607. 6 rotates, thereby driving the upper fixed plate 6 and the upper movable plate 8 to slide along the guide column 101 to the required height position, so as to facilitate the coarse adjustment of the mold closing distance between the lower movable plate 3 and the upper movable plate 8, and using the tightening cylinder 601 to generate an upward pulling force on the upper fixed plate 6 to eliminate the thread gap between the threaded tooth sleeve 606 and the guide column 101, and using the adjustment reduction motor 501 to drive the transmission sprocket 502 to rotate, and using the linkage chain 7 and the driven sprocket 505 to drive each transmission screw sleeve 504 to rotate synchronously, so that the positioning stud 503 and the assembly seat 508 are lifted and lowered, driving the first connecting rod 402 and the second connecting rod 403 to cooperate with the bending and stretching activities, so as to adjust the stroke range of the lower movable plate 3, so as to facilitate the fine adjustment of the mold closing distance between the lower movable plate 3 and the upper movable plate 8, prevent the mold closing distance from being easily adjusted. The phenomenon of large adjustment errors makes the precise adjustment of the mold closing distance more convenient.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A four-column mold table with stroke adjustment function, characterized in that: It comprises a lower fixed plate (1), a top frame (2), a lower movable plate (3), a stroke adjustment assembly (5), an upper fixed plate (6) and an upper movable plate (8); Four guide pillars (101) are fixedly installed between the lower fixed plate (1) and the top frame (2); the upper movable plate (8) and the lower movable plate (3) are slidably sleeved on the outside of the guide pillars (101) from top to bottom in sequence; the top of the guide pillar (101) is a threaded portion; the upper fixed plate (6) is rotatably connected to a threaded sleeve (606); the threaded sleeve (606) is threadedly sleeved on the outside of the top of the guide pillar (101); a driving component for driving the threaded sleeve (606) to rotate is provided on the upper fixed plate (6); a tightening cylinder (601) is fixedly installed on the upper fixed plate (6); the telescopic end of the tightening cylinder (601) is fixedly connected to the bottom of the top frame (2); the tightening cylinder (601) is used to generate a force to eliminate a thread gap between the threaded sleeve (606) and the guide pillar (101); A lower crank arm assembly (4) is arranged between the lower fixed plate (1) and the lower movable plate (3); the stroke adjustment assembly (5) is arranged between the lower movable plate (3) and the lower crank arm assembly (4); the stroke adjustment assembly (5) is used to adjust the stroke range of the lower movable plate (3); and an upper crank arm assembly (9) is arranged between the upper fixed plate (6) and the upper movable plate (8).

2. The four-column mold table with stroke adjustment function according to claim 1, characterized in that: The lower crank arm assembly (4) comprises a lower reduction motor (401), a first connecting rod (402) and a second connecting rod (403); the lower reduction motor (401) is fixedly mounted on the outer side of the lower fixed plate (1); the output shaft of the lower reduction motor (401) is fixedly connected to a lower transmission shaft (404); a lower eccentric wheel (405) is fixedly sleeved on the outer side of the lower transmission shaft (404); a lower cam (406) is rotatably sleeved on the outer side of the lower eccentric wheel (405); the first connecting rod (402) is movably hinged to the upper end of the lower fixed plate (1); the second connecting rod (403) is movably hinged to the upper end of the first connecting rod (402); and one end of the lower cam (406) is movably hinged to the inner side of the first connecting rod (402).

3. The four-column mold table with stroke adjustment function according to claim 2, characterized in that: The stroke adjustment assembly (5) comprises an adjustment reduction motor (501), a transmission sprocket (502), a positioning stud (503), a transmission screw sleeve (504) and a driven sprocket (505); the adjustment reduction motor (501) is fixedly mounted on the outer side of the lower movable plate (3); the transmission sprocket (502) is fixedly connected to the output shaft of the adjustment reduction motor (501); the driven sprocket (505) is rotatably connected to the bottom of the lower movable plate (3); and the transmission screw sleeve (504) is screwed to the lower movable plate (3). The tooth pattern is sleeved on the outside of the positioning stud (503); the transmission screw sleeve (504) is rotatably connected to the bottom of the lower movable plate (3) via a bearing (506); a linkage sprocket (507) is fixedly sleeved on the outside of the transmission screw sleeve (504); the positioning stud (503) is fixedly connected to the upper end of the second connecting rod (403) via an assembly seat (508); and the transmission sprocket (502) is transmission-connected to the driven sprocket (505) and the linkage sprocket (507) via a linkage chain (7).

4. The four-column mold platform with stroke adjustment function according to claim 1, characterized in that: The driving assembly comprises a transmission chain (607), a lifting motor (608) and a guide sprocket (609); the lifting motor (608) is fixedly mounted on an upper fixed plate (6); the guide sprocket (609) is fixedly connected to an output shaft of the lifting motor (608); and the guide sprocket (609) is transmission-connected to a threaded tooth sleeve (606) via a transmission chain (607).

5. The four-column mold platform with stroke adjustment function according to claim 1, characterized in that: Two lower auxiliary cylinders (102) are symmetrically fixedly mounted on the lower fixed plate (1), and the telescopic ends of the lower auxiliary cylinders (102) are fixedly connected to the bottom of the lower movable plate (3) via lower vertical rods (103).

6. The four-column mold platform with stroke adjustment function according to claim 5, characterized in that: The upper end of the lower fixed plate (1) is rotatably connected to the lower transverse axis (104), both ends of the lower transverse axis (104) are movably hinged with lower linkage side rods (105), and a lower movable rod (106) is movably hinged between the lower linkage side rod (105) and the lower vertical rod (103).

7. The four-column mold platform with stroke adjustment function according to claim 1, characterized in that: The upper crank arm assembly (9) comprises an upper reduction motor (901), a third connecting rod (902) and a fourth connecting rod (903); the upper reduction motor (901) is fixedly mounted on the outer side of the upper fixed plate (6); the output shaft of the upper reduction motor (901) is fixedly connected to an upper transmission shaft (904); an upper eccentric wheel (905) is fixedly sleeved on the outer side of the upper transmission shaft (904); an upper cam (906) is rotatably sleeved on the outer side of the upper eccentric wheel (905); the third connecting rod (902) is movably hinged to the bottom of the upper fixed plate (6); the fourth connecting rod (903) is movably hinged between the upper movable plate (8) and the third connecting rod (902); and one end of the upper cam (906) is movably hinged to the inner side of the third connecting rod (902).

8. A four-column mold platform with stroke adjustment function according to claim 2 or 7, characterized in that: A support I is fixedly mounted on one side of the lower fixed plate (1) close to the lower transmission shaft (404), and the support I is rotatably sleeved outside the lower transmission shaft (404). A support II is fixedly mounted on one side of the upper fixed plate (6) close to the upper transmission shaft (904), and the support II is rotatably sleeved outside the upper transmission shaft (904).

9. The four-column mold platform with stroke adjustment function according to claim 1, characterized in that: Two upper auxiliary cylinders (602) are symmetrically fixedly mounted on the upper fixed plate (6), and the telescopic ends of the upper auxiliary cylinders (602) are fixedly connected to the upper end of the upper movable plate (8) via upper uprights (603).

10. The four-column mold platform with stroke adjustment function according to claim 9, characterized in that: The bottom end of the upper fixed plate (6) is rotatably connected to the upper transverse axis (604), both ends of the upper transverse axis (604) are movably hinged with upper linkage side rods (605), and an upper movable rod is movably hinged between the upper linkage side rod (605) and the upper vertical rod (603).

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