CN110861208A

CN110861208A - Die changing system of large-tonnage press

Info

Publication number: CN110861208A
Application number: CN201910963402.4A
Authority: CN
Inventors: 陈延林; 吴梓豪; 邓耀顺; 梁德成; 谈建豪; 林伟琼
Original assignee: Foshan Henglitai Machinery Co Ltd
Current assignee: Foshan Henglitai Machinery Co Ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-03-06
Anticipated expiration: 2039-10-11
Also published as: CN110861208B

Abstract

The invention discloses a die changing system of a large-tonnage press, which comprises a base, a lower die assembly and an ejection device which are arranged on the base, a die frame arranged on the outer side of the lower die assembly, side rails arranged on two sides of the die frame, and a die changing device used for changing the lower die assembly; a mold locking mechanism is arranged between the lower mold assembly and the mold frame and used for locking and unlocking the lower mold assembly and the mold frame; a locking mechanism is arranged between the mold frame and the side rails and used for locking or unlocking the mold frame and the side rails; the ejection device is connected with the side rails and drives the mold frame to float; and the side rails are provided with rolling assemblies and guide assemblies. The invention can realize quick die change and improve the safety and reliability of die change.

Description

Die changing system of large-tonnage press

Technical Field

The invention relates to the technical field of ceramic presses, in particular to a die changing system of a large-tonnage press.

Background

When a common press is used for changing the mold, the mold ejecting device is required to eject the whole set of mold, and the mold changing device moves the whole set of mold out of the press. For a small-tonnage press, the whole set of die is light in weight, the jacking force required by the die ejecting device is small, the whole set of die can be easily ejected, and the whole set of die can be moved out through a die changing device such as a forklift. With the continuous development of building decoration materials, the requirements for large ceramic plates and the customization requirements for ceramic plates are continuously improved, so that the tonnage of a ceramic press is continuously increased, and certain requirements are also provided for the die changing efficiency. For a press with tonnage as high as tens of thousands of tons, the lower die assembly weighs tens of tons, the whole die is ejected by adopting a die ejecting device in the prior art, the die is difficult to change by using a forklift, and firstly, the ejection force and the drag force required by the die are very large; secondly, in the process of dragging, the die is easy to deviate, and the reliability and the safety of die changing of the press are affected. The die change difficulty of the large-tonnage press is high, the efficiency is low, and the safety is not high. The cost of replacing the entire set of molds is also high for the customer.

Chinese publication No. CN108246893A "a numerical control rapid die change method and a numerical control rapid die change device" provides a rapid die change device, which includes an automatic die change mechanism die change device, a positioning device, a height adjustment mechanism, and the like, wherein the positioning device is used for fixedly connecting the die change device with a press platen on which a die to be changed is placed; the height adjusting mechanism adjusts the height of the die changing equipment, and an automatic die changing mechanism is arranged on the table top of the die changing equipment; the automatic die changing mechanism comprises two die guide push plates and an automatic shifting device, the die guide push plates are used for clamping a die to be changed, the automatic shifting device is arranged on the table board, the two die guide push plates are arranged on two sides of the table board, and a clamping wheel is arranged at one end, close to the platen of the press, of the die guide push plates. The clamping wheel clamps a positioning pin on the die so as to pull the die out of or push the die into the working platform of the press.

In the prior art, the mold is moved by adopting pushing force or pulling force, but for the mold with the weight of dozens of tons, the mold is difficult to replace by the pulling force or the pushing force. In addition, a certain gap is formed between the working platform of the press and the die changing equipment under the influence of the installation position of a hydraulic instrument on the end surface of the press. In the prior art, no protection is involved, so that when the mould is dragged to move, the mould is easy to deflect and even fall, and serious safety accidents are caused.

Disclosure of Invention

The invention aims to solve the technical problem of providing a die change system of a large-tonnage press, which can realize quick die change and improve the safety and reliability of die change.

In order to solve the technical problem, the invention provides a die changing system of a large-tonnage press, which comprises a base, a lower die assembly and an ejection device which are arranged on the base, a die frame arranged on the outer side of the lower die assembly, side rails arranged on two sides of the die frame, and a die changing device used for changing the lower die assembly;

a mold locking mechanism is arranged between the lower mold assembly and the mold frame and used for locking and unlocking the lower mold assembly and the mold frame;

a locking mechanism is arranged between the mold frame and the side rails and used for locking or unlocking the mold frame and the side rails;

the ejection device is connected with the side rails and drives the mold frame to float;

and the side rails are provided with rolling assemblies and guide assemblies.

As an improvement of the above technical solution, the locking mechanism includes a lock catch disposed on the mold frame, and the side rail is provided with a first groove disposed in cooperation with the lock catch.

As an improvement of the technical proposal, the locking mechanism also comprises a positioning component and a locking component,

the positioning assembly is used for aligning and locking the side rail and the mold frame, and the positioning assembly and the locking assembly can drive the mold frame to ascend or descend for a preset distance relative to the side rail so that the lock catch is fastened or loosened with the groove.

As an improvement of the above technical solution, the positioning assembly includes a plurality of positioning cylinders disposed on the side rails, the mold frame is provided with a first positioning hole, and a piston rod of the positioning cylinder is inserted into the first positioning hole;

the locking assembly comprises a plurality of locking cylinders arranged on the side rails, and the locking cylinders can longitudinally extend out or retract so as to drive the mold frame to ascend or descend for a preset distance and enable the lock catch to be fastened or loosened with the first groove.

As an improvement of the above technical solution, the rolling assembly includes a plurality of first roller groups arranged on the side rails; the guide assembly comprises a plurality of guide wheels arranged on the side rails, and the guide wheels are abutted with the side walls of the mold frame;

the locking cylinder, the first roller group and the guide wheel are arranged on the top surface of the side rail at intervals.

As an improvement of the technical scheme, the lower die assembly sequentially comprises a lower die core, a magnetic plate in the die and a middle plate in the die from top to bottom, and is connected with the base through the lower magnetic plate;

the mold locking mechanism comprises a magnetic plate arranged in the mold and a slot arranged on the middle plate of the mold, and the mold frame is provided with a pin hole matched with the slot.

As an improvement of the technical scheme, the die changing device comprises a frame, a plurality of groups of driving parts arranged on the frame, a dragging assembly used for dragging the die frame, and a guiding rolling assembly.

As an improvement of the above technical solution, the driving part comprises a dragging motor, a transmission part and a guiding sliding part; the transmission component comprises a fixed part and a movable part, the fixed part is connected with the frame, and the movable part is connected with the dragging motor;

the dragging assembly comprises a connecting frame connected with the dragging motors and a dragging plate connected with the mold frame.

As an improvement of the above technical solution, the transmission part is a rack and pinion transmission part, and the rack and pinion transmission part includes a rack arranged on the frame and a gear connected with the motor;

the guide sliding part comprises a sliding block arranged on the connecting frame and a sliding rail arranged on the frame.

As an improvement of the technical scheme, a guide rolling assembly is further arranged on the outer side of the driving part; the guiding rolling assembly comprises a frame body arranged on the outer side of the frame, a second roller set arranged on the frame body and a guiding piece;

the guide piece is arranged on the inner side of the second roller group, the guide piece is provided with a first inclined plane, and the lock catch is provided with a second inclined plane matched with the first inclined plane.

The implementation of the invention has the following beneficial effects:

the invention comprises an ejection device, wherein the ejection device is connected with a side rail, and the side rail is connected with a mold frame through a locking mechanism, so that the ejection device can drive the mold frame to lift, and normal brick pressing and mold stripping of a press are realized. The ejection device drives the mold frame to float, so that the brick pressing and demolding are realized, and the large-tonnage pressing machine is suitable for large-tonnage presses. Compared with the prior art, the method can avoid the deformation of the mold ejector plate due to stress, thereby improving the demolding stability of green bricks and the green brick molding quality. The tonnage of the press is up to 36000t, the press can press the ceramic large plate with the size of 3.6m by 1.6m, and the forming quality of the ceramic large plate is good. In addition, the lower die assembly and the die frame are locked through the die locking mechanism, the die frame is placed on the rolling assembly on the side rail after the side rail and the die frame are unlocked through the locking mechanism, the die changing device drags the die frame to move out, and the problem of quick die changing of a press die weighing tens of tons is solved. Furthermore, the rolling assembly and the guide assembly on the side rail are used for reducing the friction resistance when the die frame moves, preventing the deviation when the die frame moves and improving the reliability and the safety of die replacement. Obviously, the die changing system is also suitable for the middle and small-tonnage presses, can realize the automatic die changing of the middle and small-tonnage presses, and improves the die changing efficiency.

Furthermore, the locking mechanism comprises a lock catch arranged on the mold frame, the side rail is provided with a first groove matched with the lock catch, and the side rail is provided with a positioning assembly and a locking assembly. The positioning assembly is a positioning cylinder, and the positioning assembly aligns the side rails with the mold frame; the locking assembly is a plurality of locking cylinders which are ejected out to support the mold frame, so that the lock catch is locked with the first groove. The locking mode is simple and reliable, and is convenient to maintain.

The mould changing device comprises a plurality of groups of driving parts and dragging assemblies, the dragging assemblies are connected with dragging motors of the plurality of groups of driving parts, and applied pulling force acts on the mould frame to enable the mould frame to move. The driving part comprises a dragging motor and a transmission part driven by the dragging motor, the transmission part comprises a fixed part and a movable part, and the movable part is connected with the dragging motor. The dragging motor rotates to drive the movable part and the dragging assembly to move. The mould frame is synchronously driven to move by a plurality of groups of driving parts, and a larger pulling force is provided to pull out the mould frame of the large-tonnage press. Furthermore, the rolling guide assembly is arranged to reduce friction force when the die frame moves and prevent the die frame from deviating when the die frame moves, and stability during movement is improved.

Drawings

FIG. 1 is a top view of a die change system to which the present invention relates;

FIG. 2 is a front view of a press section configuration to which the present invention relates;

FIG. 3 is a left side view of the press section configuration to which the present invention relates;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a front view of a die change apparatus to which the present invention relates;

FIG. 6 is a top view of a die change apparatus according to the present invention;

fig. 7 is a left side view of the die change apparatus according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the invention is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the invention.

Referring to fig. 1 to 4, the invention provides a die changing system of a large-tonnage press, which comprises a base 100, a lower die assembly 1 and an ejection device 2 which are arranged on the base 100, a die frame 4 which is arranged on the outer side of the lower die assembly 1, side rails 3 which are arranged on two sides of the die frame 4, and a die changing device 200 which is used for changing the lower die assembly 1;

a mold locking mechanism is arranged between the lower mold component 1 and the mold frame 4 and used for locking and unlocking the lower mold component 1 and the mold frame 4;

a locking mechanism 5 is arranged between the mold frame 4 and the side rail 3, and the locking mechanism 5 is used for locking or unlocking the mold frame 4 and the side rail 3;

the ejection device 2 is connected with the side rail 3, and the ejection device 2 drives the mold frame 4 to float;

and a rolling assembly 6 and a guide assembly 7 are arranged on the side rail 3.

Specifically, ejecting device 2 provides unsteady power for framed 4, ejecting device 2 includes a plurality of liftout cylinders 21 and back timber 22 of locating framed 4 below, be equipped with on the back timber 22 the side rail 3, liftout cylinder 21 lifts back timber 22, in order to drive side rail 3 up-and-down motion. When bricks are pressed, the locking mechanism 5 locks the mold frame 4 and the side rails 3, the ejection device 2 drives the mold frame 4 to ascend, so that the mold frame 4 is higher than the top surface of the lower mold assembly 1, and the material distribution device (not shown in the attached drawings) distributes materials; the movable beam (not shown in the attached drawings) of the press drives the upper die assembly (not shown in the attached drawings) to press down to form the green brick. When demoulding, the mould frame 4 and the side rail 3 are kept in a locked state; the ejection device 2 descends to enable the green bricks to be higher than the upper surface of the mold frame 4, and the green bricks are moved out through a brick moving device (not shown in the drawing); the ejection device 2 drives the mold frame 4 to reset, and the next step of material distribution and brick pressing is carried out. When the mold is replaced, the ejection device 2 descends, the mold frame 4 and the lower mold assembly 1 are locked through the mold locking mechanism, and the ejection device 2 ascends to separate the mold to be replaced from the base 100; unlocking the mold frame 4 and the side rail 3 through the locking mechanism 5, and placing the mold frame 4 on the rolling assembly 6 on the side rail 3; the rolling assembly 6 can reduce the friction resistance during dragging, and the guide assembly 7 is abutted against the mold frame 4 to prevent the mold frame 4 from deviating during movement.

Referring to fig. 2, in order to change the mold, the mold frame 4 and the mold to be changed are connected as a whole. The lower die assembly 1 comprises a lower die core 11, a die middle magnetic plate 12 and a die middle plate 13 from top to bottom in sequence, and the lower die assembly 1 is fixed with the base 100 through a lower magnetic plate 14; the mold locking mechanism comprises a slot 15 arranged on the magnetic plate 12 in the mold and a middle plate 13 in the mold, and pin holes 42 matched with the slot 15 are arranged on the front end surface and the rear end surface of the mold frame 4. When the press normally works, the lower die assembly 1 and the lower magnetic plate 14 are fixed through magnetic attraction, and the lower die core 11, the middle magnetic plate 12 of the die and the middle plate 13 of the die are connected through magnetic attraction or bolts. The lower magnetic plate 14 can be matched with lower die assemblies 1 of various specifications for use, the universality is good, and the lower magnetic plate 14 does not need to be replaced during die change. When the lower die assembly 1 is replaced, the lower die assembly 1 to be replaced needs to be connected with the die frame 4 into a whole, and the die frame 4 is pulled by external force to move the lower die assembly 1 out.

Specifically, the invention provides two modes of die change: the lower mold core 11 is replaced, and the upper mold core or the whole set of mold is replaced. When the lower mold core is replaced, the lower mold core 11, the magnetic plate 12 in the mold and the middle plate 13 in the mold are pulled out together, and the middle plate 13 in the mold is connected with the mold frame 4; when the upper mold core or the whole set of mold is replaced, the upper mold core, the lower mold core 11, the magnetic plate 12 in the mold and the middle plate 13 in the mold are pulled out together, and at the moment, the magnetic plate 12 in the mold is connected with the mold frame 4. After determining the mode change form, the ejection device 2 is lowered to a certain height, the pin holes 42 are aligned with the slots 15 on the magnetic plates 12 in the mold or the middle plates 13 in the mold, pins (not shown in the drawing) are inserted into the slots 15 through the pin holes 42, and the mold frame 4 is locked with the magnetic plates 12 in the mold or the middle plates 13 in the mold; the ejection device 2 ascends, and the pin is locked with the slot 15; under the action of the ejection force of the ejection device 2, the mold middle plate 13 is separated from the lower mold lower magnetic plate 14. Thereafter, the locking mechanism 5 unlocks the side rail 3 and the mold frame 4, and the mold frame 4 is placed on the side rail 3.

Referring to fig. 3 and 4, the locking mechanism 5 includes a lock catch 51 disposed on the mold frame 4, and the side rail 3 is provided with a first groove 31 disposed to cooperate with the lock catch 51. The lock catch 51 is movable up and down in the first groove 31 by an external force to fasten or unfasten the side rail 3 to or from the mold frame 4. The locking mechanism 5 further comprises a positioning assembly 52 and a locking assembly 53 arranged between the side rail 3 and the mold frame 4.

The positioning assembly 52 includes positioning cylinders 521 disposed at two ends of the side rails 3, a first positioning hole 45 adapted to the positioning cylinders 521 is disposed on a bottom surface of the mold frame 4, and a piston rod of the positioning cylinder 521 can be inserted into the first positioning hole 45 of the mold frame 4 to align the mold frame 4 and the side rails 3. In addition, the positioning component 52 ensures that the relative position between the mold frame 4 and the lower mold component 1 is accurate and reliable by limiting the transverse offset when the mold frame 4 is extruded, and a reasonable gap is formed to avoid the interference between the mold frame 4 and the mold component 1 when the brick is pressed, so that the safety and the stability when the mold frame 4 and the side rail 3 are locked are improved. The mould frame 4 and the side rails 3 have two working states: when the brick is pressed and the mould is released, the piston rod of the positioning cylinder 521 is inserted into the positioning hole 45 of the mould frame 4, the piston rod of the locking cylinder 531 is ejected out, and the lock catch 51 is locked with the first groove 31. During die change, the piston rod of the locking cylinder 531 descends, the piston rod of the positioning cylinder 521 descends, and the die frame 4 and the side rail 3 are unlocked.

In order to further improve the locking reliability of the mold frame 4 and the side rail 3, the locking assembly 53 includes a plurality of locking cylinders 531 arranged on the side rail 3, and the locking cylinders 531 can longitudinally extend or retract to drive the mold frame 4 to ascend or descend by a predetermined distance, so that the lock catches 51 are fastened with or released from the first grooves 31. Wherein the height of the locking cylinder 531 when retracted and the height of the guide assembly 7 are lower than the height of the rolling assembly 6, so that the mold frame 4 is placed on the rolling assembly 6 when the piston rod of the locking cylinder 531 is lowered to the lowest position. In addition, a plurality of the locking cylinders 531 are connected to a hydraulic control system (not shown in the drawings) to perform synchronous lifting. The hydraulic control system can be a multi-cylinder synchronous control system. Through the synchronous motion of locking cylinder 531, the motion of framed 4 is steady, security and reliability when can improve the retooling. The bottom surface of the mold frame 4 is provided with a second groove 41, and the piston rod of the locking cylinder 531 extends out and then abuts against the second groove 41, so as to fasten the lock catch 51 with the first groove 31.

In order to reduce the running resistance of the mold frame 4 during the movement on the side rail 3 and prevent the mold frame 4 from deviating during the movement, the rolling assembly 6 comprises a plurality of groups of first roller groups 61 arranged on the side rail 3; the guide assembly 7 comprises a guide wheel 71 arranged on the side rail 3, and the guide wheel 71 is abutted with the side wall of the mold frame 4. The rolling surface of the first roller group 61 is in contact with the second groove surface 41 of the mold frame 4, and the resistance of the mold frame 4 during dragging is reduced in a rolling friction mode; the guide wheels 71 abut against the side walls of the mold frame 4 to define the movement locus of the mold frame 4.

In summary, the side rail 3 is integrated with a plurality of positioning cylinders 521, a locking cylinder 531, a first roller set 61 and a guide wheel 71, and the locking cylinder 531, the first roller set 61 and the guide wheel 71 are spaced apart from each other on the top surface of the side rail 3. The locking and unlocking of the mold frame 4 and the side rails 3 are realized through the positioning cylinder 521 and the locking cylinder 531, and the brick pressing, the demolding and the mold changing of a press are facilitated. The first roller group 61 and the guide wheel 71 reduce the running resistance during die change, and improve the reliability of die change.

Referring to fig. 5 and 7, the mold changing apparatus 200 includes a frame 201, a plurality of sets of driving members 8 disposed on the frame 201, a dragging assembly 9 for dragging the mold frame 4, and a guiding rolling assembly 10. The invention drives the dragging component 9 to move by the plurality of groups of driving components 8, so as to provide larger dragging force, and facilitate the driving components 8 to drag the mould frame 4 to walk on the frame 201. In this embodiment, the frame 201 is provided with a protruding portion 202, and the driving component 8 is disposed on both sides of the protruding portion 202.

The driving part 8 comprises a dragging motor 81, a transmission part 82 and a guide sliding part 83; the transmission component 82 comprises a fixed part 821 and a movable part 822, the fixed part 821 is connected with the frame 201, and the movable part 822 is connected with the dragging motor 81; the plurality of groups of dragging motors 81 are connected with the dragging assembly 9. The transmission component 82 may be a rack and pinion transmission, a lead screw transmission, or a worm and gear transmission, but is not limited thereto. In order to achieve synchronous movement of the plurality of sets of driving members 8 and increase the torque during transmission, the transmission member 82 is preferably a rack and pinion transmission. The gear-rack transmission part comprises a rack arranged on the protruding part 202 and a gear connected with the dragging motor 81, and the gear moves along the rack to drive the dragging component 9 to walk to pull out the mold frame 4 and the mold fixed on the mold frame 4. The gear and rack transmission mode is adopted, the transmission power is large, synchronous motion of a plurality of driving parts 8 can be realized, and the running stability of the device is improved. The dragging assembly 9 includes a connecting frame 91 and a dragging plate 92 for connecting with the mold frame 4. Specifically, the plurality of dragging motors 81 are connected with a connecting frame 91, the connecting frame 91 is provided with the dragging plate 92, the dragging plate 92 is provided with a connecting hole 921, and the mold frame 4 is provided with a connecting pin 43 adapted to the connecting hole 921.

In order to further improve the stability of the driving components 8 during movement, the two driving components 8 are prevented from rotating relatively to cause the risk of jamming. A guide sliding portion 83 is disposed between the movable portion 822 and the frame 201, and the guide sliding portion 83 includes a slider 831 and a slide rail 832 disposed on the frame 201. Specifically, the sliding block 831 is provided with a v-shaped slideway, and the sliding rail 832 is provided with an arc surface matched with the inclined surface of the v-shaped slideway. The two inclined surfaces of the v-shaped slide way are in contact with the two arc surfaces of the slide rail 832, so that the guide can be realized, and the friction resistance can be reduced.

To prevent the sliding block 831 from derailing, the end of the sliding rail 832 is further provided with a baffle 205. The baffle 205 can play a role of mechanical limit, and the sliding block 831 is prevented from being separated, so that the safety during die change is improved.

A guiding rolling assembly 10 is further disposed outside the driving part 8, and the guiding rolling assembly 10 includes a frame 101 disposed outside the frame 201, and a second roller set 102 and a guiding member 103 disposed on the frame 101. Specifically, the guide 103 is disposed inside the second roller set 102; the guide 103 is provided with a first inclined surface 103a, and the lock catch 51 is provided with a second inclined surface 511 matched with the first inclined surface 103 a. The mold frame 4 slides along the working surface of the second roller set 102, meanwhile, the lock catch 51 is provided with a second inclined surface 511 matched with the first inclined surface 103a of the guide member 103, the included angle between the two first inclined surfaces 103a of the guide member 103 is smaller than 90 degrees, the movement direction of the mold frame 4 is limited through the inclined surfaces, and the guiding stability is improved. Meanwhile, the first inclined planes 103a of the two guide members 103 are also used as positioning devices between the mold frame 4 and the mold changing device 200, so that the center of the mold frame 4 is accurately positioned when the mold frame 4 is placed on the mold changing device 200, and the mold frame 4 and the lower mold assembly 1 locked with the mold frame can smoothly move along the direction limited by the guide assemblies 7 on the side rails 3.

The frame body 101 is further provided with a positioning connecting rod 104, the positioning connecting rod 104 is arranged in front of the frame body 101, and the side rail 3 is provided with a positioning hole 44 matched with the positioning connecting rod 104. Further, a height adjusting device 105 is disposed between the frame body 101 and the frame 201, and the height adjusting device 105 is an adjusting screw or a hydraulic jacking cylinder, but is not limited thereto. Before the press is fixed with the die-changing device 200, the height adjusting device 105 is adjusted to align the positioning connecting rod 104 with the center of the positioning hole 44. Thereafter, the positioning connecting rods 104 are inserted into the positioning holes 44.

A walking assembly is arranged below the frame 201 and comprises a walking wheel 106 and a walking motor 107 which are arranged on the frame 201. A track is arranged on the ground to facilitate the walking of the walking wheels 106. Specifically, the traveling assembly drives the device to approach the press, adjusts the height adjusting device 105 to align the positioning connecting rod 104 on the frame 101 with the positioning hole 44 corresponding to the press, and inserts the positioning connecting rod 104 into the positioning hole 44 corresponding to the press, so that the press and the device are connected into a whole.

In summary, the present invention includes various mold changing modes such as replacing the whole set of mold, replacing the lower mold core 11, and replacing the upper mold core, and the mold changing process of the present invention is described below by taking the replacement of the lower mold core 11 as an example:

1. the ejection device 2 drives the mold frame 4 to descend to a corresponding position, and the mold frame 4 and the mold middle plate 13 are locked;

2. the ejection device 2 is lifted upwards, so that the middle plate 13 of the mold is separated from the lower magnetic plate 14;

3. the piston rods of the locking cylinder 531 and the positioning cylinder 521 are lowered to the minimum, and the mold frame 4 is placed on the first roller group 61;

4. the walking motor 107 drives the walking wheels 106 to walk along the track on the ground, the height adjusting device 105 is adjusted to enable the positioning connecting rod 104 to be inserted into the positioning hole 44, the connecting pin shaft 43 is inserted into the dragging plate 92, and the mold frame 4 is connected with the dragging plate 92;

5. the dragging motor 81 drives the gear to rotate, the gear runs along the rack, and the connecting frame 91 fixed with the dragging motors 81 drives the dragging plate 92 to run so as to move the mold frame 4 out until the mold frame moves onto the mold changing device 200;

6. disassembling the old lower mold core 11 and replacing the new lower mold core 11;

7. the dragging motor 81 rotates reversely, the dragging plate 92 drives the mold frame 4 to send the mold frame 4 to the corresponding position of the press, and the connection between the connecting pin shaft 43 and the dragging plate 92 is released;

8. the piston rod of the positioning cylinder 521 rises until being inserted into the first positioning hole 45 of the mold frame 4, so that the mold frame 4 is accurately positioned;

9. the piston rod of the locking cylinder 531 is raised and abutted against the second groove 41 to lock the mold frame 4 and the side rail 3;

10. then the ejection device 2 drives the mold frame 4 and the lower mold component 1 locked with the mold frame to descend until the mold middle plate 13 contacts with the lower magnetic plate 14;

11. the pins in the pin holes 42 are in loose connection with the slots 15, and the pins between the die frame 4 and the lower die assembly 1 are removed;

12. the lower magnetic plate 14 is electrified to adsorb the lower die assembly 1, the lower die assembly 1 is fixed with the lower magnetic plate 14, and the ejection device 2 ejects the die frame 4 to finish die change.

Correspondingly, if the upper mold core needs to be replaced, the movable beam (not shown in the attached drawing) moves downwards, the upper mold core (not shown in the attached drawing) is placed on the lower mold assembly 1, and the upper magnetic plate (not shown in the attached drawing) is powered off and separated from the upper mold core.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. The die changing system of the large-tonnage press is characterized by comprising a base, a lower die assembly and an ejection device which are arranged on the base, a die frame arranged on the outer side of the lower die assembly, side rails arranged on two sides of the die frame and a die changing device used for changing the lower die assembly;

and the side rails are provided with rolling assemblies and guide assemblies.

2. The die change system of a large-tonnage press as recited in claim 1, wherein the locking mechanism comprises a lock catch disposed on the die frame, and the side rail is provided with a first groove disposed in cooperation with the lock catch.

3. The die change system of large tonnage press as set forth in claim 2, wherein said locking mechanism comprises a positioning assembly and a locking assembly,

4. The die changing system of the large-tonnage press as recited in claim 3, wherein the positioning assembly comprises a positioning cylinder disposed on the side rail, the die frame is provided with a first positioning hole, and a piston rod of the positioning cylinder is inserted into the first positioning hole;

5. The die change system of the large-tonnage press as recited in claim 4, wherein the rolling assembly comprises a plurality of first roller sets disposed on the side rails; the guide assembly comprises a plurality of guide wheels arranged on the side rails, and the guide wheels are abutted with the side walls of the mold frame;

6. The die changing system of the large-tonnage press as recited in claim 1, wherein the lower die assembly comprises a lower die core, a magnetic plate in the die and a middle plate in the die from top to bottom in sequence, and the lower die assembly is connected with the base through the lower magnetic plate;

7. The die changing system of the large-tonnage press as recited in claim 1, wherein the die changing device comprises a frame, a plurality of sets of driving members disposed on the frame, a dragging assembly for dragging the die frame, and a guiding rolling assembly.

8. The die change system of a large-tonnage press as recited in claim 7, wherein the driving member comprises a dragging motor, a transmission member and a guiding sliding part; the transmission component comprises a fixed part and a movable part, the fixed part is connected with the frame, and the movable part is connected with the dragging motor;

9. The die change system of a large-tonnage press as recited in claim 8, wherein the transmission member is a rack and pinion transmission member, the rack and pinion transmission member including a rack provided on the frame and a pinion connected to the motor;

10. The die changing system of the large-tonnage press as recited in claim 9, wherein a guide rolling assembly is further provided outside the driving part; the guiding rolling assembly comprises a frame body arranged on the outer side of the frame, a second roller set arranged on the frame body and a guiding piece;