Molding press for well lid machining

Abstract

The invention relates to the technical field of well lid die-casting molding equipment, in particular to a molding press for well lid machining, which comprises a base, two pairs of supporting legs, a limiting assembly, a jacking assembly, a pair of reversing structures, a molding structure and a pressing structure, the limiting assemblies are fixedly arranged on the upper wall of the base and located at the four corners, the jacking assembly is fixedly arranged in the middle of the lower wall of the base, the reversing structures are arranged on the lower walls of the front end and the rear end of the base correspondingly and are symmetrical, the molding structure is fixedly arranged on the lower wall of the base and located at the moving groove, and the pressing structure is fixedly arranged in the middle of the upper wall of the base. Rectangular well lids and circular well lids are compatible, through the detachable and turnover design of the first mold plate and the second mold plate, the rectangular mold grooves and the annular mold grooves can be rapidly switched, the machining requirements of the rectangular well lids and the circular well lids are met, multiple purposes are achieved through one machine, mold switching is more convenient, and the production preparation time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of manhole cover die-casting equipment, in particular to a molding die machine used for manhole cover processing. Background Art

[0002] Although the existing manhole cover processing and forming equipment has significant advantages in production efficiency and forming accuracy, it still has some disadvantages and limitations. The existing equipment is costly, inactive, and the mold replacement is complicated. For example, in the production of manhole covers, corresponding manhole cover frames are required to install and support the manhole covers, and then two sets of equipment need to be purchased or the molds need to be disassembled and replaced for production. The mold replacement process is complicated and time-consuming, which reduces the flexibility of the equipment and reduces production efficiency. In addition, some manhole covers are round or rectangular. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problems of high cost and complicated mold replacement of the above-mentioned existing equipment, and to provide a molding die press for manhole cover processing. In order to achieve the purpose of the present invention, the following technical scheme is adopted to achieve it.

[0004] To achieve the above-mentioned solution, the present invention provides the following technical solutions: a molding die press for manhole cover processing, comprising a base, two pairs of legs, a limit assembly, a lifting assembly, a pair of reversing structures, a molding structure and a pressing structure, wherein five lifting holes are opened through the middle of the base, and movable grooves are opened in the middle of the left and right ends of the base, one end of the two pairs of legs are respectively fixedly arranged on the lower wall of the base and located at the four corners, the limit assembly is fixedly arranged on the upper wall of the base and located at the four corners, the lifting assembly is fixedly arranged in the middle of the lower wall of the base, a pair of the reversing structures are respectively arranged on the lower walls at the front and rear ends of the base and are symmetrical to each other, the molding structure is fixedly arranged on the lower wall of the base and located at the movable groove, the pressing structure is fixedly arranged in the middle of the upper wall of the base, the limit assembly is used to limit the molding structure, the lifting assembly is used for demolding, a pair of the reversing structures are used to change the shape of the mold, and the pressing structure is used to apply pressure for molding.

[0005] Preferably, the limiting assembly includes two pairs of first hydraulic cylinders and two pairs of top claws; the two pairs of the first hydraulic cylinders are respectively obliquely arranged on the upper wall of the base and respectively correspond to the diagonals of the base, the two pairs of the top claws are both L-shaped, the two pairs of the top claws are respectively fixedly arranged on the telescopic ends of the first hydraulic cylinders, and the top claws are symmetrical to each other.

[0006] Preferably, the jacking assembly includes a support frame, a second hydraulic cylinder, a bracket and five jacking columns; the support frame is fixedly arranged in the middle part of the lower wall of the base, one end of the second hydraulic cylinder is fixedly arranged on the support frame, the middle part of the bracket is fixedly arranged on the telescopic end of the second hydraulic cylinder, and the bracket is located below the base, one end of the five jacking columns are respectively fixedly arranged on the bracket, and the other ends of the jacking columns are respectively movable through the jacking holes.

[0007] Preferably, the reversing structure includes a first shaft, a gear, a slide, a rack, a cylinder frame and a third hydraulic cylinder; the top end of the first shaft movably passes through the base and is located on the center line of the front end of the base, the first shaft is located on the front side of the movable groove, the gear is fixedly sleeved on the bottom end of the first shaft, the slide is fixedly set on the lower wall of the base and is located on the left side of the gear, the rack is movably sleeved on the slide, and the rack is engaged with the gear, the cylinder frame is fixedly set on the lower wall of the base and is located on the front side of the slide, one end of the third hydraulic cylinder is fixedly set on the cylinder frame, and the telescopic end of the third hydraulic cylinder is connected to one end of the rack.

[0008] Preferably, the molding structure includes a pair of electric slide rails, a pair of frames, a pair of motors, a pair of second shaft rods, two pairs of first templates, two pairs of second templates, two pairs of fixing bolts, an embedded frame and a downward pressing frame; the pair of electric slide rails are respectively fixedly arranged on the lower walls at the left and right ends of the base, the electric slide rails are located at the rear side of the movable groove, the pair of frames are respectively fixedly arranged on the electric slide rails and the frames move left and right, the top of the frames are movably inserted in the movable groove, the pair of motors are respectively fixedly arranged in the middle of the lower wall of the frame, one end of a pair of second shaft rods respectively movably passes through the middle of the top of the frame, and the other end of the second shaft rods is respectively connected to the driving end of the motor, the two pairs of the first templates are both convex, and the middle part of one end is symmetrically provided with a socket, the middle part of the lower wall of the two pairs of the first templates is respectively fixedly sleeved on the top of the first shaft rod to and one end of the second shaft rod, and the first templates are respectively parallel to the four sides of the base, wherein the length of the first templates at the front and rear ends is smaller than the length of the first templates at the left and right ends, the two ends of the two pairs of the first templates are respectively relatively fitted and connected, one end of the two pairs of the second templates are respectively movably inserted in the socket part of the first template, and the other ends of the two pairs of the second templates are arc structures with the same diameter, the two pairs of the fixing bolts are respectively movably screwed in the middle part of the first template and tightened on one end of the second template, the embedded frame is rectangular and the lower wall is provided with five plug-in columns, the embedded frame can be detachably placed in the middle part of the upper wall of the base and the plug-in columns can be movably inserted in the jacking holes, the embedded frame is located in the two pairs of first templates, the downward pressing frame is a rectangular frame, the downward pressing frame can be detachably placed on the lower wall of the rectangular pressure plate and fixed by bolts.

[0009] Preferably, the downward pressure structure includes a gantry, a pair of fourth hydraulic cylinders, a rectangular pressure plate, a pair of fifth hydraulic cylinders, a cross plate and a pressure column; the two ends of the gantry are respectively fixedly arranged at the middle of the upper walls at the front and rear ends of the base, one end of a pair of fourth hydraulic cylinders are respectively symmetrically arranged on the inner upper wall of the gantry, the rectangular pressure plate is fixedly arranged between the telescopic ends of the fourth hydraulic cylinder, and the rectangular pressure plate corresponds to the middle of the base plate, one end of a pair of fifth hydraulic cylinders are respectively fixedly arranged on the upper wall of the rectangular pressure plate and located at one of the corners, the cross plate is fixedly arranged between the telescopic ends of the fifth hydraulic cylinder, one end of the pressure column movably passes through between the rectangular pressure plates, and the other end of the pressure column is fixedly connected to the middle of the cross plate.

[0010] Preferably, one end of the pressure column is located below the rectangular pressure plate or the lower wall of the pressure column and the lower wall of the rectangular pressure plate are on the same horizontal plane.

[0011] Preferably, the first templates are connected to form a rectangular mold groove in the middle, or the second templates are connected to form a circular mold groove in the middle.

[0012] Preferably, the top claws are respectively attached to one end of a pair of first templates and are located at the corners.

[0013] The present invention provides a molding die press for manhole cover processing, which has the following beneficial effects: 1. The present invention is compatible with both rectangular and circular manhole covers. Through the detachable and flip design of the first template and the second template, the rectangular mold groove and the annular mold groove can be quickly switched to meet the processing requirements of rectangular manhole covers and circular manhole covers, realizing multiple uses of one machine, making mold switching more convenient and shortening production preparation time.

[0014] 2. The first template and the second template of the present invention adopt a detachable design, which is convenient for disassembly, replacement and maintenance, reducing the maintenance cost of the equipment. Through the adjustment of the downward pressure structure and die-casting molding, the size and shape accuracy of the manhole cover and the manhole cover seat can be ensured, and the product quality is improved. The splicing and flipping design of the first template and the second template ensures the stability of the mold groove and reduces errors in the molding process.

[0015] 3. The present invention reduces the number of special molds and reduces mold costs through the flipping and splicing design of the first template and the second template. It is not only suitable for ordinary rectangular and circular manhole covers, but also can adapt to the processing of manhole covers of other special shapes by adjusting the template and the downward pressure structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the assembly structure of the present invention; Figure 2 It is a schematic diagram showing the assembly structure of the present invention; Figure 3 It is a schematic diagram of the split structure of the commutation structure; Figure 4 It is an enlarged structural diagram of the commutation structure; Figure 5 It is a schematic diagram of the split structure of the molded structure; Figure 6 It is a schematic diagram of the split structure of the downward pressure structure; Figure 7 for Figure 3 A partial enlarged view of point A in the figure.

[0017] In the figure: 1, base, 2, support leg, 3, limit assembly, 31, first hydraulic cylinder, 32, top claw, 4, lifting assembly, 41, support frame, 42, second hydraulic cylinder, 43, bracket, 44, top column, 5, reversing structure, 51, first shaft rod, 52, gear, 53, slide, 54, rack, 55, cylinder frame, 56, third hydraulic cylinder, 6, molding structure, 61, electric slide rail, 62, frame, 63, motor, 64, second shaft rod, 65, first template, 66, second template, 67, fixing bolt, 68, embedded frame, 69, pressing frame, 7, pressing structure, 71, gantry, 72, fourth hydraulic cylinder, 73, rectangular pressure plate, 74, fifth hydraulic cylinder, 75, cross plate, 76, pressure column, 8, movable groove, 9, lifting hole, 10, socket, 11, plug column. DETAILED DESCRIPTION

[0018] The specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 1-Figure 7 As shown, the present invention provides a technical solution: a molding die press for manhole cover processing, comprising a base 1, two pairs of legs 2, a limit assembly 3, a lifting assembly 4, a pair of reversing structures 5, a molding structure 6 and a pressing structure 7, five lifting holes 9 are opened through the middle of the base 1, and a moving groove 8 is opened in the middle of the left and right ends of the base 1, one end of the two pairs of legs 2 is respectively fixedly arranged on the lower wall of the base 1 and located at the four corners, the limit assembly 3 is fixedly arranged on the upper wall of the base 1 and located at the four corners, the lifting assembly 4 is fixedly arranged in the middle of the lower wall of the base 1, a pair of reversing structures 5 are respectively arranged on the lower walls of the front and rear ends of the base 1 and are symmetrical to each other, the molding structure 6 is fixedly arranged on the lower wall of the base 1 and located at the moving groove 8, and the pressing structure 7 is fixedly arranged in the middle of the upper wall of the base 1; the legs 2 are used to support the base 1, the limit assembly 3 is used to limit the molding structure 6, the lifting assembly 4 is used for demoulding, the pair of reversing structures 5 are used to change the shape of the mold, and the pressing structure 7 is used to apply pressure for molding.

[0020] As a further embodiment of the present invention, Figure 3As shown, the limiting assembly 3 includes two pairs of first hydraulic cylinders 31 and two pairs of top claws 32; the two pairs of first hydraulic cylinders 31 are respectively tiltedly arranged on the upper wall of the base 1 and respectively correspond to the diagonals of the base 1, and the two pairs of top claws 32 are both L-shaped, and the two pairs of top claws 32 are respectively fixedly arranged on the telescopic ends of the first hydraulic cylinders 31, and the top claws 32 are symmetrical to each other, and are locked and fixed by the first hydraulic cylinders 31.

[0021] As a further embodiment of the present invention, Figure 3 As shown, the jacking assembly 4 includes a support frame 41, a second hydraulic cylinder 42, a bracket 43 and five jacking columns 44; the support frame 41 is fixedly arranged in the middle of the lower wall of the base 1, one end of the second hydraulic cylinder 42 is fixedly arranged on the support frame 41, the middle part of the bracket 43 is fixedly arranged on the telescopic end of the second hydraulic cylinder 42, and the bracket 43 is located below the base 1, one end of the five jacking columns 44 are respectively fixedly arranged on the bracket 43, and the other ends of the jacking columns 44 are respectively movable through the jacking holes 9; the second hydraulic cylinder 42 carried by the support frame 41 drives the five jacking columns 44 on the bracket 43 to rise and fall through the jacking holes 9 to help demolding.

[0022] As a further embodiment of the present invention, Figure 3 , Figure 4 and Figure 7 As shown, the reversing structure 5 includes a first shaft rod 51, a gear 52, a slide 53, a rack 54, a cylinder frame 55 and a third hydraulic cylinder 56; the top end of the first shaft rod 51 movably passes through the base 1 and is located on the front center line of the base 1, the first shaft rod 51 is located in front of the movable groove 8, the gear 52 is fixedly sleeved on the bottom end of the first shaft rod 51, the slide 53 is fixedly set on the lower wall of the base 1 and is located on the left side of the gear 52, the rack 54 is movably sleeved on the slide 53, and the rack 54 is engaged with the gear 52, the cylinder frame 55 is fixedly set on the lower wall of the base 1 and is located in front of the slide 53, one end of the third hydraulic cylinder 56 is fixedly set on the cylinder frame 55, and the telescopic end of the third hydraulic cylinder 56 is connected to one end of the rack 54; the rack 54 is driven to move under the limiting action of the slide 53 by the third hydraulic cylinder 56, and the gear 52 and the first shaft rod 51 are driven to rotate by the rack 54.

[0023] As a further embodiment of the present invention, Figure 5As shown, the molding structure 6 includes a pair of electric slide rails 61, a pair of frames 62, a pair of motors 63, a pair of second shafts 64, two pairs of first templates 65, two pairs of second templates 66, two pairs of fixing bolts 67, an embedded frame 68 and a pressing frame 69; the pair of electric slide rails 61 are respectively fixedly arranged on the lower walls at the left and right ends of the base 1, the electric slide rails 61 are located at the rear side of the moving groove 8, the pair of frames 62 are respectively fixedly arranged on the electric slide rails 61 and the frames 62 move left and right, the top of the frames 62 are movably inserted in the moving groove 8, the pair of motors 63 are respectively fixedly arranged in the middle of the lower wall of the frame 62, and one end of the pair of second shafts 64 is respectively movably The first templates 65 are convex, and the middle of one end is symmetrically provided with a socket 10. The middle of the lower wall of the two pairs of first templates 65 is respectively fixedly mounted on the top of the first shaft 51 and one end of the second shaft 64, and the first templates 65 are respectively parallel to the four sides of the base 1, wherein the length of the first templates 65 at the front and rear ends is less than the length of the first templates 65 at the left and right ends, and the two ends of the two pairs of first templates 65 are respectively relatively fitted and connected, and one end of the two pairs of second templates 66 is respectively movably inserted in the socket 10 of the first template 65, and the two The other ends of the second templates 66 are all arc-shaped structures with the same diameter. Two pairs of fixing bolts 67 are respectively movably screwed into the middle of the first template 65 and pressed against one end of the second template 66. The embedded frame 68 is rectangular and has five plug posts 11 on the lower wall. The embedded frame 68 can be detachably placed in the middle of the upper wall of the base 1 and the plug posts 11 are movably inserted into the jacking holes 9. The embedded frame 68 is located in the two pairs of first templates 65. The pressing frame 69 is a rectangular frame. The pressing frame 69 can be detachably placed on the lower wall of the rectangular pressing plate 73 and fixed by bolts. The two first templates 65 and the second template 66 are driven by the electric slide rail 61 to move in the opposite direction and detach from the other The two first templates 65 and the second template 66 outside, thereby prompting the other two first templates 65 to be turned over and changed surfaces without obstruction with the help of the first shaft 51, and the second shaft 64 is driven by the motor 63 to rotate to prompt one pair of first templates 65 to rotate and change surfaces, and the manhole cover seat is produced by cooperating with the embedded frame 68 and the downward pressing frame 69. The first templates 65 are connected to each other to form a rectangular mold groove in the middle or the second templates 66 are connected to each other to form a circular mold groove in the middle, which is used for processing manhole covers or processing manhole seats of different shapes. The top claws 32 are respectively attached to one end of a pair of first templates 65 and are located at the corner, which are designed to fix the first templates 65 after docking.

[0024] As a further embodiment of the present invention, Figure 6As shown, the pressing structure 7 includes a gantry 71, a pair of fourth hydraulic cylinders 72, a rectangular pressing plate 73, a pair of fifth hydraulic cylinders 74, a cross plate 75 and a pressing column 76; the two ends of the gantry 71 are respectively fixedly arranged on the middle of the upper wall of the front and rear ends of the base 1, one end of the pair of fourth hydraulic cylinders 72 is respectively symmetrically arranged on the inner upper wall of the gantry 71, the rectangular pressing plate 73 is fixedly arranged between the telescopic ends of the fourth hydraulic cylinders 72, and the rectangular pressing plate 73 corresponds to the middle of the base plate, and one end of the pair of fifth hydraulic cylinders 74 is respectively fixedly arranged on the upper wall of the rectangular pressing plate 73 and located at one of the pairs of At the corner, the horizontal plate 75 is fixedly arranged between the telescopic ends of the fifth hydraulic cylinder 74, one end of the pressure column 76 is movable through the rectangular pressure plate 73, and the other end of the pressure column 76 is fixedly connected to the middle of the horizontal plate 75; the rectangular pressure plate 73 is driven down by the fourth hydraulic cylinder 72 to process the rectangular manhole cover, or the fifth hydraulic cylinder 74 is driven to pass the pressure column 76 through the rectangular pressure plate 73 for extrusion molding of circular manhole covers. One end of the pressure column 76 is located below the rectangular pressure plate 73 or the lower wall of the pressure column 76 is on the same horizontal plane as the lower wall of the rectangular pressure plate 73, which is used for processing manhole covers of different shapes.

[0025] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process. The specific work is as follows.

[0026] The equipment is supported and fixed by the legs 2 on the lower wall of the base 1, and the base 1 is supported at a certain height; after the equipment is powered on, the limit assembly 3, the reversing structure 5 and the molding structure 6 are driven according to the needs of processing the manhole cover; that is, the first hydraulic cylinder 31 in the limit assembly 3 is driven to contract, and the top claw 32 is unlocked from the first template 65; then the two electric slide rails 61 in the molding structure 6 are driven to drive the two first templates 65 to move relatively away, that is, the driving of the electric slide rail 61 drives the frame 62 and the second shaft 64 to move along the moving groove 8; then The third hydraulic cylinder 56 on the cylinder frame 55 in the rear drive reversing structure 5 is extended and retracted, and the rack 54 is driven to move under the limiting action of the slide 53 by the third hydraulic cylinder 56, and then the first shaft 51 is driven to rotate in the base 1 through the engagement of the rack 54 and the gear 52, so as to drive the other two first templates 65 to rotate 180 degrees, and then the motor 63 in the frame 62 is controlled to drive the first template 65 on the second shaft 64 to rotate 180 degrees, so as to change the surface of the first template 65 relative to the wall, and then reset it for docking and connection; Since the second template 66 is fixed to one side of the first template 65 by fastening bolts, when the second template 66 is located between the first template 65, the second template 66 forms an annular space, and the composite material can be put into the circular manhole cover processing; when the second template 66 is located on the outside of the first template 65 after splicing, the first template 65 forms a rectangular space for rectangular manhole cover processing; the embedded frame 68 can also be inserted into the jacking hole 9 with the help of the plug column 11, and then the four side walls of the embedded frame 68 are respectively corresponding to the first template 65 to form a rectangular frame space, and the down-pressing frame 69 can be installed on the lower wall of the rectangular pressing plate 73 in the down-pressing structure 7 to fit and correspond, so as to extrude and form a well seat of the rectangular frame.

[0027] When processing a circular manhole cover, the fourth hydraulic cylinder 72 on the gantry 71 is driven to extend, and at the same time, the fifth hydraulic cylinder 74 is driven to drive the pressure column 76 on the cross plate 75 to pass through the rectangular pressure plate 73, so as to drive the pressure column 76 to descend into the circular space formed by the second template 66 for the forming of the circular manhole cover.

[0028] When processing a rectangular manhole cover, the fourth hydraulic cylinder 72 is driven to drive the rectangular pressing plate 73 to descend and insert it into the rectangular space formed by the first template 65 for forming. At the same time, the fifth hydraulic cylinder 74 is used to fit the lower wall of the pressing column 76 with the lower wall of the rectangular pressing plate 73 to form a plane.

[0029] Since the two ends of the first template 65 are not stable after being connected to each other, and are easily deformed by downward pressure, it is necessary to control the top claw 32 to be stuck in the connection between the two first templates 65 for limit locking; after the molding process, the pressure column 76 or the rectangular pressure plate 73 is raised and reset, the second hydraulic cylinder 42 on the support frame 41 in the jacking assembly 4 can be driven to extend, driving the top column 44 on the bracket 43 to pass through the jacking hole 9 to assist in demoulding or first disengage the embedded frame 68 and drive two of the first templates 65 on the electric slide rail 61 to move relatively away to facilitate demoulding; the second template 66 in this device is fixed to the first template by fastening bolts The socket 10 of the plate 65 can be removed and replaced due to wear, and during demolding, the two first templates 65 or the second template 66 can be pre-detached with the help of the electric slide rail 61 to help apply force to demold and reduce wear; the equipment can also first pass the pressure column 76 through the rectangular pressure plate 73 and fit the upper wall of the base 1 in the middle between the first templates 65 during extrusion, and then form an annular shielding object in the middle of the rectangular space formed by the splicing of the first templates 65, and then after the material is put in, the fifth hydraulic cylinder 74 and the fourth hydraulic cylinder 72 are driven at the same time, prompting the pressure column 76 to remain stationary while the rectangular pressure plate 73 descends to form a rectangular manhole cover frame with an annular hollow.

[0030] 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 molding die press for manhole cover processing, characterized in that: The invention comprises a base (1), two pairs of legs (2), a limit assembly (3), a lifting assembly (4), a pair of reversing structures (5), a molding structure (6) and a pressing structure (7), wherein five lifting holes (9) are provided through the middle of the base (1), and movable grooves (8) are provided in the middle of both left and right ends of the base (1), one end of the two pairs of legs (2) are respectively fixedly arranged on the lower wall of the base (1) and located at the four corners, the limit assembly (3) is fixedly arranged on the upper wall of the base (1) and located at the four corners, and the lifting assembly (4) is fixedly arranged on the upper wall of the base (1) and located at the four corners. The mold forming structure (6) is fixedly arranged on the middle part of the lower wall of the base (1); a pair of the reversing structures (5) are respectively arranged on the lower walls of the front and rear ends of the base (1) and are symmetrical to each other; the mold forming structure (6) is fixedly arranged on the lower wall of the base (1) and is located at the movable groove (8); the pressing structure (7) is fixedly arranged on the middle part of the upper wall of the base (1); the limiting assembly (3) is used to limit the mold forming structure (6); the lifting assembly (4) is used for demoulding; the pair of the reversing structures (5) are used to change the shape of the mold; and the pressing structure (7) is used to apply pressure for molding.

2. A molding die press for manhole cover processing according to claim 1, characterized in that: The limit assembly (3) comprises two pairs of first hydraulic cylinders (31) and two pairs of top claws (32); the two pairs of first hydraulic cylinders (31) are respectively arranged obliquely on the upper wall of the base (1) and respectively correspond to the diagonal lines of the base (1); the two pairs of top claws (32) are both L-shaped; the two pairs of top claws (32) are respectively fixedly arranged on the telescopic ends of the first hydraulic cylinders (31), and the top claws (32) are symmetrical to each other.

3. A molding die press for manhole cover processing according to claim 2, characterized in that: The jacking assembly (4) comprises a support frame (41), a second hydraulic cylinder (42), a bracket (43) and five jacking columns (44); The support frame (41) is fixedly arranged at the middle part of the lower wall of the base (1); one end of the second hydraulic cylinder (42) is fixedly arranged on the support frame (41); the middle part of the bracket (43) is fixedly arranged on the telescopic end of the second hydraulic cylinder (42); the bracket (43) is located below the base (1); one end of the five top columns (44) are respectively fixedly arranged on the bracket (43); and the other ends of the top columns (44) are respectively movably inserted into the lifting holes (9).

4. A molding die press for manhole cover processing according to claim 3, characterized in that: The reversing structure (5) comprises a first shaft (51), a gear (52), a slide (53), a rack (54), a cylinder frame (55) and a third hydraulic cylinder (56); The top end of the first shaft (51) movably passes through the base (1) and is located on the front center line of the base (1). The first shaft (51) is located in front of the movable groove (8). The gear (52) is fixedly sleeved on the bottom end of the first shaft (51). The slide (53) is fixedly arranged on the lower wall of the base (1) and is located on the left side of the gear (52). The rack (54) is movably sleeved on the slide (53), and the rack (54) is engaged with the gear (52). The cylinder frame (55) is fixedly arranged on the lower wall of the base (1) and is located in front of the slide (53). One end of the third hydraulic cylinder (56) is fixedly arranged on the cylinder frame (55), and the telescopic end of the third hydraulic cylinder (56) is connected to one end of the rack (54).

5. A molding die press for manhole cover processing according to claim 4, characterized in that: The molding structure (6) comprises a pair of electric slide rails (61), a pair of frames (62), a pair of motors (63), a pair of second shafts (64), two pairs of first mold plates (65), two pairs of second mold plates (66), two pairs of fixing bolts (67), an embedded frame (68) and a pressing frame (69); A pair of electric slide rails (61) are respectively fixedly arranged on the lower walls at the left and right ends of the base (1), the electric slide rails (61) are located at the rear side of the movable groove (8), a pair of frames (62) are respectively fixedly arranged on the electric slide rails (61) and the frames (62) move left and right, the top of the frames (62) are movably inserted into the movable groove (8), a pair of motors (63) are respectively fixedly arranged at the middle of the lower wall inside the frames (62), one end of a pair of second shaft rods (64) are respectively movably penetrated through the middle of the top of the frames (62), and the other end of the second shaft rods (64) are respectively connected to the driving end of the motor (63), the two pairs of first templates (65) are both convex, and the middle of one end is symmetrically provided with a socket (10), the middle of the lower wall of the two pairs of first templates (65) are respectively fixedly mounted on the top of the first shaft rod (51) and one end of the second shaft rod (64), and the first templates (65) are respectively parallel to the four sides of the base (1), wherein the front and rear ends of the first templates (65) are respectively located The length of the first templates (65) at both ends is smaller than the length of the first templates (65) at the left and right ends. The two pairs of the first templates (65) are respectively connected at both ends in a relatively close fit. One end of the two pairs of the second templates (66) is respectively movably inserted in the socket (10) of the first template (65). The other ends of the two pairs of the second templates (66) are arc structures with the same diameter. The two pairs of fixing bolts (67) are respectively movably screwed in the middle of the first template (65) and pressed against one end of the second template (66). The embedded frame (68) is rectangular and has five plug posts (11) on the lower wall. The embedded frame (68) is detachably placed in the middle of the upper wall of the base (1) and the plug posts (11) are movably inserted in the lifting holes (9). The embedded frame (68) is located in the two pairs of the first templates (65). The pressing frame (69) is a rectangular frame. The pressing frame (69) is detachably placed on the lower wall of the rectangular pressing plate (73) and fixed by bolts.

6. A molding die press for manhole cover processing according to claim 5, characterized in that: The downward pressing structure (7) comprises a gantry (71), a pair of fourth hydraulic cylinders (72), a rectangular pressing plate (73), a pair of fifth hydraulic cylinders (74), a horizontal plate (75) and a pressing column (76); The two ends of the gantry (71) are respectively fixedly arranged at the middle of the upper walls of the front and rear ends of the base (1); one end of a pair of fourth hydraulic cylinders (72) are respectively symmetrically arranged on the inner upper wall of the gantry (71); the rectangular pressing plate (73) is fixedly arranged between the telescopic ends of the fourth hydraulic cylinder (72), and the rectangular pressing plate (73) corresponds to the middle of the base plate; one end of a pair of fifth hydraulic cylinders (74) are respectively fixedly arranged on the upper wall of the rectangular pressing plate (73) and located at one of the two corners; the cross plate (75) is fixedly arranged between the telescopic ends of the fifth hydraulic cylinder (74); one end of the pressure column (76) movably passes through between the rectangular pressing plates (73), and the other end of the pressure column (76) is fixedly connected to the middle of the cross plate (75).

7. A molding die press for manhole cover processing according to claim 6, characterized in that: One end of the pressure column (76) is located below the rectangular pressure plate (73) or the lower wall of the pressure column (76) and the lower wall of the rectangular pressure plate (73) are on the same horizontal plane.

8. A molding die press for manhole cover processing according to claim 7, characterized in that: The first template (65) is connected to the rear middle portion to form a rectangular mold groove, or the second template (66) is connected to the rear middle portion to form a circular mold groove.

9. A molding die press for manhole cover processing according to claim 8, characterized in that: The top claws (32) are respectively fitted to one end of a pair of first templates (65) and are located at the corners.

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