CN110587784B

CN110587784B - Static pressure forming method for cement brick

Info

Publication number: CN110587784B
Application number: CN201910971453.1A
Authority: CN
Inventors: 王静怡; 其他发明人请求不公开姓名
Original assignee: Anhui Lanxi Engineering Technology Development Co ltd
Current assignee: Anhui Lanxi Engineering Technology Development Co ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2021-04-16
Anticipated expiration: 2039-10-14
Also published as: CN110587784A

Abstract

The invention belongs to the technical field of building material static pressure forming, and particularly relates to a static pressure forming method of a cement brick, wherein a mould of a static pressure forming machine of the cement brick is replaced according to the design specification of the cement brick, and the filling height of the mould is adjusted; the quick-connecting mechanism is used for detachably connecting the upper die with the upper die base, and the driving mechanism is used for driving the quick-connecting mechanism to be connected and disconnected, so that the upper die and the upper die base are automatically connected and separated, the separated upper die directly falls into the lower die and is integrally detached from the lower die, manual operation is reduced, particularly, when the lower die is matched with a plurality of upper dies at the same time, die changing efficiency can be greatly improved, in addition, the quick-connecting mechanism is not required to be replaced when bricks with the same shape and different thicknesses are processed, and the equipment operation efficiency is further improved.

Description

Static pressure forming method for cement brick

Technical Field

The invention belongs to the technical field of building material static pressure forming, and particularly relates to a static pressure forming method of a cement brick.

Background

The existing static pressure forming equipment is expensive, and in order to improve the application value of the static pressure forming equipment, one static pressure equipment is often required to be capable of adapting to forming molds of various shapes and specifications, so that the molds need to be replaced or debugged according to actual production needs in the using process. The moulds in different shapes need to be replaced for products in different shapes, and even the products in the same shape have different filling thicknesses according to different requirements. In the prior art, the specification of a set of mould is fixed, so the mould needs to be replaced even if the product has the same shape and the seasoning has different thicknesses, and the mould replacement in the prior art generally adopts manual operation, thereby wasting time and energy and seriously influencing the production efficiency.

Disclosure of Invention

The invention aims to provide a static pressure forming method of cement bricks, which can improve the working efficiency of equipment when processing cement bricks with different specifications.

The technical scheme adopted by the invention is as follows.

A static pressure forming method of cement bricks is characterized in that a mould of a static pressure forming machine of cement bricks is replaced according to the design specification of the cement bricks, and the filling height of the mould is adjusted; the static pressure forming machine for the cement bricks comprises a top beam, a base, an upper die holder, a lower die holder, an upper die, a lower die, a bottom die, a hydraulic cylinder, a hopper and a trough; the upper die and the lower die are arranged on the lower die base, a die cavity corresponding to the upper die is arranged on the lower die, the hydraulic cylinder is arranged on the top beam, and a piston rod of the hydraulic cylinder is arranged downwards and is abutted to the top surface of the upper die base; the bottom die is arranged on the base in a sliding mode along the horizontal direction, and a vibration power source is arranged on the bottom die; the hopper is positioned above the side of the lower die base, the trough is positioned below the hopper, the trough is arranged between the lower side of the hopper and the top surface of the lower die in a sliding manner along the horizontal direction, the bottom surface of the trough is of a through structure, a scraper blade is arranged on one side wall of the trough, which is far away from the hopper, and the bottoms of the trough and the scraper blade are attached to the top surface of the lower die; a quick connection mechanism is arranged between the upper die and the upper die base, a driving mechanism for driving the quick connection mechanism to be connected and disconnected is arranged on the upper die base, and the lower die is detachably connected with the lower die base; the bottom die is provided with cushion blocks which correspond to the die cavities one by one, the cushion blocks are movably arranged along the vertical direction, and a height adjusting mechanism for adjusting the height of the cushion blocks is arranged in the bottom die; the specific method for replacing the die comprises the following steps: the lower die base of the upper die base is closed, the upper die is inserted into the bottommost end of the die cavity, the driving mechanism drives the quick connection mechanism to be disconnected, the upper die falls into the die cavity, then the upper die plate is separated from the lower die plate, and then the lower die is detached from the lower die plate; putting a new upper die into a new lower die cavity, installing a new lower die on the lower die base, folding the upper die base and the lower die base again, driving the quick connection mechanism between the upper die base and the new upper die to be connected by the driving mechanism, and finally controlling the upper die base to be separated from the lower die base, so that the die replacement is completed; the specific method for adjusting the height of the filler comprises the following steps: the height adjusting mechanism adjusts the height of the cushion block according to the height of the filler required before the cement brick is compacted so as to change the height of the material which can be accommodated in the die cavity; after the static pressure forming machine of the cement brick is debugged, putting cement materials into a hopper, and quantitatively putting the cement materials into a material groove by the hopper, wherein overtravel feeding is adopted in the process, namely the feeding amount is larger than the material amount required by the forming of the cement brick; the material groove transfers the cement material to the upper part of the lower die, the cement material fills the die cavity, the vibration power source of the bottom die continuously vibrates the lower die in the process to compact the cement material, the material groove reversely moves after the cement material fills the die cavity, and the scraper scrapes off the redundant material at the upper end of the die cavity; then adjusting the cushion block to the lowest point by an adjusting mechanism, moving the upper template downwards to pre-press the filler, and when the forming height of the filler is 3-5 mm higher than the design height of the cement brick, starting pressurizing the upper die base by a cylinder body of a hydraulic cylinder until the forming height reaches the design height of the cement brick; and finally, releasing the pressure of the hydraulic cylinder, synchronously moving the upper die holder and the lower die holder upwards for a stroke, moving the bottom die out of the space below the lower die holder, synchronously moving the lower die bottom surface of the upper die holder and the lower die holder downwards to be close to a material receiving plate at the bottom of the forming machine, driving the lower die holder upwards while keeping the height of the upper die holder unchanged, enabling the green bricks in the die cavity to fall off from the bottom of the die cavity to the material receiving plate under the blocking of the upper die, and finishing the forming.

Go up die holder bottom and be equipped with the projection that the projection set up downwards, it installs at the projection lower extreme to go up the mould, connect the connector that the mechanism set up on including last mould top surface soon, the connector has the protruding portion of transversely stretching out, the projection lower extreme is equipped with the clamp splice, the clamp splice is assembled and is removed between following two stations: in the first station, the clamping block is embedded below the protruding part to limit the vertical displacement between the convex column and the connector; in the second station, the clamping block moves out from the lower part of the protruding part so that the convex column and the connector can be relatively displaced along the vertical direction; the quick-connecting mechanism further comprises a locking block, the locking block is movably arranged along the vertical direction, and the locking block moves between the following two heights: the locking block is transversely abutted against the clamping block at the first station to prevent the clamping block from moving out of the lower part of the protruding part; the locking block is horizontally kept away from the clamping block so that the clamping block can be moved out from the position below the protruding portion; the matching surface between the clamping block and the protruding part is an inclined surface, and when the locking block is positioned at the second station and the convex column is upwards separated from the connecting head, the clamping block can move out from the lower part of the protruding part under the action of the inclined surface; the driving mechanism is used for driving the locking block to move between a first height and a second height.

The clamping block is pivoted with the convex column, the clamping block is provided with a first side face matched with the convex protrusion part and a second side face back to the first side face, the first side face is provided with a convex part used for blocking and connecting with the bottom face of the convex protrusion part, and the second side face is positioned on a vertical movable path of the locking block; when the locking block moves from the second height to the first height, the locking block pushes the second side surface to enable the clamping block to swing, and further the protruding portion of the first side surface swings to the position below the protruding portion; and chamfers are arranged at the upper end of the protruding part and the lower end of the second side surface, and when the locking block is positioned at the second station and the protruding column is folded downwards with the connecting head, the clamping block can be automatically opened under the guidance of the chamfers.

The high two-position lifting mechanism is located above the high one, the driving device comprises a lifting support arranged at the upper end of a convex column, the lifting support is fixedly connected with a locking block through a connecting rod, a first elastic unit is arranged between the lifting support and an upper die base, the first elastic unit is assembled to enable the lifting support to move downwards due to elasticity of the first elastic unit, a push block movably arranged along the vertical direction is arranged at the bottom of the upper die base, the push block is blocked and connected with the bottom surface of the lifting support, and when the upper die base and the lower die base are folded, the top surface of the lower die base is extruded to push the push block to push the lifting support to enable the locking block to be lifted to the high two position through the high.

A limiting mechanism is arranged between the lifting support and the upper die base and comprises a pin column arranged on the lifting support and a guide groove arranged on the upper die base, the pin column is arranged on a sliding block, and the sliding block is connected with the lifting support in a sliding manner along the horizontal direction; the guide groove comprises a first section and a second section, wherein the first section is vertically arranged, the second section is obliquely arranged upwards from the lower end of the first section, the upper end of the second section is vertically provided with a third section, the upper end of the third section is communicated with the upper end of the first section through a V-shaped fourth section, the inflection point of the upper inner wall and the inflection point of the lower inner wall of the fourth section are arranged in a staggered mode, the inflection point of the upper inner wall is deviated to one side where the first section is located, and the inflection point of the lower inner wall is deviated to one side where the third section is located; the pin column protrudes into the guide groove; a first lock tongue is arranged between the upper end of the first section and the fourth section, the first lock tongue is arranged on the side wall of the first section in a sliding mode, one end of the first lock tongue protrudes into the first section, the other end of the first lock tongue is provided with a second elastic unit, the second elastic unit is assembled to enable the first lock tongue to slide towards the first section under the action of elastic force of the second elastic unit, an inclined surface is arranged below the first lock tongue, the top surface of the first lock tongue is flush with the inner wall of the lower side of the fourth section, when the pin column moves upwards from the lower end of the first section, the first lock tongue can be pushed away and enters the fourth section, and when the pin column falls back, the first lock tongue top surface can slide into a V-shaped groove of the fourth section; when the pin column moves upwards from the V-shaped groove of the fourth section, the pin column can slide to the upper end of the third section under the guidance of the inner wall on the upper side of the fourth section, and when the pin column falls back, the pin column can fall back to the lower end of the first section along the third section and the second section in sequence; the locking block is at the first height when the pin column is located at the lower end of the first section, and the locking block is at the second height when the pin column is located in the V-shaped groove of the fourth section.

The second spring bolt is arranged on the push block and is connected with the lifting support in a blocking mode, a third elastic unit is arranged between the second spring bolt and the push block, the third elastic unit is assembled to enable the elastic force of the third elastic unit to drive the second spring bolt to move to one side where the lifting support is located, the top surface of the second spring bolt is a plane, the bottom surface of the second spring bolt is an inclined surface, the second spring bolt blocks the lifting support when the lifting support moves downwards relative to the push block, and the second spring bolt is pushed open when the lifting support moves upwards relative to the push block so as to move to the position above the second spring bolt; the second lock bolt is provided with an unlocking pin, the upper die base is provided with an unlocking block, the unlocking block is provided with an inclined plane, the inclined plane is positioned on a vertical movement path of the unlocking pin, and when the pushing block passes through the unlocking block from bottom to top, the unlocking pin can drive the second lock bolt to move in a direction away from the lifting support under the guidance of the inclined plane of the unlocking block and enable the second lock bolt to be separated from the lifting support; the height of the unlocking block is set as: in the process that the push block pushes the lifting support to move upwards, when the pin enters the fourth section from the first section and enters the third section from the fourth section, the unlocking block just pushes the second lock tongue to be separated from the lifting support; and a fourth elastic unit is arranged between the push block and the upper die base, and the fourth elastic unit is assembled so that the elastic force of the fourth elastic unit can drive the push block to move downwards relative to the upper die base.

The bottom die is provided with cushion blocks in one-to-one correspondence with the die cavities, the cushion blocks are movably arranged in the vertical direction, height adjusting mechanisms for adjusting the heights of the cushion blocks are arranged in the bottom die, and the height adjusting mechanisms adjust the heights of the cushion blocks according to the heights of fillers required by different materials so as to change the heights of the materials which can be accommodated in the die cavities.

The height adjusting mechanism comprises a slot arranged at the bottom of the cushion block and an inserting block which forms sliding fit with the slot along the horizontal direction, the top surface of the inserting block is in inclined plane fit with the top surface of the slot, and the cushion can be gradually jacked up when the inserting block is inserted into the slot.

The inserting block is connected with the material groove in a sliding mode along the horizontal direction, a fifth elastic unit is arranged between the inserting block and the material groove, the fifth elastic unit is assembled to enable the elastic force of the fifth elastic unit to drive the inserting block to move towards the direction far away from the material groove, and a limiting part used for limiting the stroke of the inserting block when the inserting block moves towards the direction far away from the material groove is further arranged between the inserting block and the material groove; when the silo to during the die cavity removes, the inserted block inserts the cushion jack-up in inserting the slot earlier, and the silo realizes continuing the motion and reacing the die cavity upper end through compressing fifth elastic unit, and when the silo moved to the direction of keeping away from the die cavity, the inserted block temporarily stayed in the slot through the resilience of fifth elastic unit, when spacing portion fender between inserted block and the silo connects, the silo drove the inserted block and takes out from the slot, and the cushion resets.

A limiting component used for limiting and adjusting the insertion depth of the insertion block is arranged between the insertion block and the insertion slot; the limiting assembly comprises a stop block arranged on the insert block, and the stop block is in blocking connection with the side wall of the bottom die; the stop block is provided with a waist-shaped hole, the length direction of the waist-shaped hole is parallel to the moving direction of the insert block, a threaded hole is formed in the insert block corresponding to the waist-shaped hole, the bolt penetrates through the waist-shaped hole and is connected with the threaded hole, the position of the limit block on the insert block is adjusted by loosening the bolt, and the limit block is fixedly connected with the insert block by screwing the bolt.

The invention has the technical effects that: the quick-connecting mechanism is used for detachably connecting the upper die with the upper die base, and the driving mechanism is used for driving the quick-connecting mechanism to be connected and disconnected, so that the upper die and the upper die base are automatically connected and separated, the separated upper die directly falls into the lower die and is integrally detached from the lower die, manual operation is reduced, particularly, when the lower die is matched with a plurality of upper dies at the same time, die changing efficiency can be greatly improved, in addition, the quick-connecting mechanism is not required to be replaced when bricks with the same shape and different thicknesses are processed, and the equipment operation efficiency is further improved.

Drawings

FIG. 1 is a front view of a static pressure cement brick molding machine according to an embodiment of the present invention;

FIG. 2 is a perspective view of a quick connect mechanism provided by an embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of one state of a quick-connect mechanism provided by an embodiment of the present invention;

FIG. 4 is an enlarged view of section I of FIG. 3;

FIG. 5 is a partial cross-sectional view of another state of the quick connect mechanism provided by an embodiment of the present invention;

FIG. 6 is an enlarged view of section II of FIG. 5;

FIG. 7 is an enlarged view of a portion III of FIG. 5;

FIG. 8 is a schematic diagram of a spacing mechanism provided by an embodiment of the present invention;

FIG. 9 is a cross-sectional view of one state of a pad adjustment mechanism provided by an embodiment of the present invention;

fig. 10 is a cross-sectional view of another state of a pad adjustment mechanism provided by an embodiment of the present invention.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.

Example 1

As shown in fig. 1, a static pressure forming machine for cement bricks comprises a top beam 10, a base 20, an upper die holder 30, a lower die holder 40, an upper die 31, a lower die 41, a bottom die 50, a hydraulic cylinder 12, a hopper 60 and a trough 70; the top beam 10 and the base 20 are fixedly connected through a guide pillar 11 which is vertically arranged, the upper die holder 30 and the lower die holder 40 are slidably arranged on the guide pillar 11, piston cylinders 13 and 14 for driving the upper die holder 30 and the lower die holder 40 to move up and down are respectively arranged on the top beam 10 and the base 20, the upper die 31 is arranged on the upper die holder 30, the lower die 41 is arranged on the lower die holder 40, a die cavity 411 corresponding to the upper die 31 is arranged on the lower die 41, the hydraulic cylinder 12 is arranged on the top beam 10, and a piston rod of the hydraulic cylinder 12 is arranged downwards and is abutted to the top surface of the upper die holder; the bottom die 50 is arranged on the base 20 in a sliding manner along the horizontal direction, and a vibration power source is arranged on the bottom die 50; the hopper 60 is positioned above the side of the lower die holder 40, the trough 70 is positioned below the hopper 60, the trough 70 is arranged between the lower side of the hopper 60 and the top surface of the lower die 41 in a sliding manner along the horizontal direction, the bottom surface of the trough 70 is of a through structure, a scraper 71 is arranged on one side wall of the trough 70, which is far away from the hopper 60, and the bottoms of the trough 70 and the scraper 71 are attached to the top surface of the lower die 41; as shown in fig. 2 to 8, a quick-connection mechanism is disposed between the upper die 31 and the upper die base 30, a driving mechanism for driving the quick-connection mechanism to connect and disconnect is disposed on the upper die base 30, and the lower die 41 is detachably connected to the lower die base 40. According to the invention, the upper die 31 is detachably connected with the upper die base 30 by using the quick-connection mechanism, and the quick-connection mechanism is driven to be connected and disconnected by using the driving mechanism, so that the automatic connection and separation of the upper die 31 and the upper die base 30 are realized, the separated upper die 31 directly falls into the lower die 41 to be integrally detached with the lower die 41, the manual operation is reduced, and particularly, when the lower die 41 is simultaneously matched with a plurality of upper dies 31, the die changing efficiency can be greatly improved.

Specifically, upper die base 30 bottom is equipped with the projection 32 that the downward projection set up, it installs at projection 32 lower extreme to go up mould 31, the quick-connect mechanism includes the connector 311 that sets up on the last mould 31 top surface, connector 311 has horizontal protruding portion, projection 32 lower extreme is equipped with clamp splice 321, clamp splice 321 is assembled and is removed between following two stations: in the first working position, the clamping block 321 is embedded below the protruding part to limit the vertical displacement between the convex column 32 and the connector 311; in the second working position, the clamping block 321 is moved out from the lower part of the protruding part to enable the protruding column 32 and the connecting head 311 to be relatively displaced along the vertical direction; the quick-connecting mechanism further comprises a locking block 33, the locking block 33 is movably arranged along the vertical direction, and the locking block 33 moves between the following two heights: at a first height, the locking block 33 is transversely abutted with the clamping block 321 at the first station to prevent the clamping block 321 from moving out from the lower part of the protruding part; the second height, the locking block 33 laterally avoids the clamping block 321 to enable the clamping block 321 to move out from under the protrusion; the matching surface between the clamping block 321 and the protruding part is an inclined surface, and when the locking block 33 is in the second station and the convex column 32 is separated from the connecting head 311 upwards, the clamping block 321 can move out from the lower part of the protruding part under the action of the inclined surface; the driving mechanism is used for driving the locking block 33 to move between a first height and a second height.

The clamping block 321 is pivoted with the protruding column 32, the clamping block 321 has a first side 3211 matched with the protruding portion and a second side 3212 facing back to the first side 3211, the first side 3211 has a protruding portion for blocking the bottom surface of the protruding portion, and the second side 3212 is located on the vertical moving path of the locking block 33; when the locking block 33 moves from the second height to the first height, the locking block 33 pushes the second side surface 3212 to swing the clamping block 321, so that the protrusion of the first side surface 3211 swings to a position below the protrusion; chamfers are arranged at the upper end of the protruding part and the lower end of the second side surface 3212, and when the locking block 33 is in the second station and the protruding column 32 is folded downwards with the connecting head 311, the clamping block 321 can automatically open under the guidance of the chamfers.

The height two is located above the height one, the driving device comprises a lifting support 34 arranged at the upper end of the convex column 32, the lifting support 34 is fixedly connected with the locking block 33 through a connecting rod 331, a first elastic unit 342 is arranged between the lifting support 34 and the upper die base 30, the first elastic unit 342 is assembled to enable the lifting support 34 to move downwards due to the elasticity of the first elastic unit, a push block 35 movably arranged in the vertical direction is arranged at the bottom of the upper die base 30, the push block 35 is connected with the bottom surface of the lifting support 34 in a blocking mode, and when the upper die base 30 is folded with the lower die base 40, the top surface of the lower die base 40 extrudes the push block 35 to jack up the lifting support 34 and enable the locking block 33 to be lifted to the height two from the height one. The invention realizes the driving of the quick connection mechanism by utilizing the opening and closing actions of the upper die holder 30 and the lower die holder 40, does not need to additionally arrange a driving part, simplifies the operation process and reduces the equipment cost. It should be particularly noted that the push block 35 is triggered only when the upper die holder 30 and the lower die holder 40 are in the extreme folding state, and in the process of normally pressing bricks by the die, because materials exist in the die cavity 411, the upper die holder 30 and the lower die holder 40 cannot reach the extreme folding station, and therefore the quick-connecting mechanism cannot be triggered to separate, so that the condition that the die accidentally falls off in the pressing process is avoided; when the die needs to be changed, no material exists in the die cavity 411, so that the stroke of the upper die holder 30 is enough to enable the lower die holder 40 to extrude the push block 35, and connection and disconnection of the quick connection mechanism are realized.

Further, as shown in fig. 8, a limiting mechanism is arranged between the lifting support 34 and the upper die base 30, the limiting mechanism is configured to be capable of keeping the locking block 33 at the second height when the pushing block 35 lifts the locking block 33 at the first height to the second height, and when the limiting mechanism lifts the locking block 33 at the second position again, the limiting mechanism is capable of releasing the locking block 33 to enable the locking block 33 to fall back to the first position under the action of the first elastic unit 342. The limiting mechanism comprises a pin 341 arranged on the lifting bracket 34 and a guide groove 36 arranged on the upper die holder 30, the pin 341 is mounted on a slider 343, and the slider 343 is connected with the lifting bracket 34 in a sliding manner along the horizontal direction; the guide groove 36 includes a first section 361 arranged vertically, and a second section 362 arranged obliquely upward from the lower end of the first section 361, a third section 363 is arranged vertically at the upper end of the second section 362, the upper end of the third section 363 is communicated with the upper end of the first section 361 through a V-shaped fourth section 364, the inflection point of the upper inner wall and the inflection point of the lower inner wall of the fourth section 364 are arranged in a staggered manner, the inflection point of the upper inner wall is deviated to one side of the first section 361, and the inflection point of the lower inner wall is deviated to one side of the third section 363; the pin 341 protrudes into the guide groove 36; a first locking tongue 365 is arranged between the upper end of the first section 361 and the fourth section 364, the first locking tongue 365 is slidably arranged on the side wall of the first section 361, one end of the first locking tongue 365 protrudes into the first section 361, the other end of the first locking tongue 365 is provided with a second elastic unit 366, the second elastic unit 366 is assembled such that the elastic force of the second elastic unit can drive the first locking tongue 365 to slide towards the first section 361, a slope is arranged below the first locking tongue 365, the top surface of the first locking tongue 365 is flush with the lower side inner wall of the fourth section 364, when the pin 341 moves upwards from the lower end of the first section 361, the first locking tongue 365 can be pushed away and enters the fourth section 364, and when the pin 341 falls back, the first locking tongue 365 can slide into the V-shaped groove of the fourth locking tongue section 364 along the top surface 365; when the pin 341 moves upward from the V-shaped groove of the fourth section 364, the pin can slide to the upper end of the third section 363 under the guidance of the upper inner wall of the fourth section 364, and when the pin 341 falls back, the pin can fall back to the lower end of the first section 361 along the third section 363 and the second section 362 in sequence; the latch block 33 is at the first height when the pin 341 is at the lower end of the first section 361 and the latch block 33 is at the second height when the pin 341 is in the V-shaped groove of the fourth section 364. As further shown in fig. 4 and 6, a second locking tongue 351 is arranged on the pushing block 35, the second locking tongue 351 is in blocking connection with the lifting support 34, a third elastic unit 353 is arranged between the second locking tongue 351 and the pushing block 35, the third elastic unit 353 is assembled such that the elastic force of the third elastic unit can drive the second locking tongue 351 to move towards the side where the lifting support 34 is located, the top surface of the second locking tongue 351 is a plane, the bottom surface of the second locking tongue 351 is an inclined surface, when the lifting support 34 moves downwards relative to the pushing block 35, the second locking tongue 351 can be blocked, and when the lifting support 34 moves upwards relative to the pushing block 35, the second locking tongue 351 can be pushed open so as to move above the second locking tongue 351; the second lock tongue 351 is provided with an unlocking pin 352, the upper die holder 30 is provided with an unlocking block 355, the unlocking block 355 is provided with an inclined plane which is positioned on the vertical movement path of the unlocking pin 352, and when the push block 35 passes through the unlocking block 355 from bottom to top, the unlocking pin 352 can drive the second lock tongue 351 to move towards the direction far away from the lifting bracket 34 under the guidance of the inclined plane of the unlocking block 355 and enable the second lock tongue 351 to be separated from the lifting bracket 34; the height of the unlocking block 355 is set to: during the process that the pushing block 35 pushes the lifting bracket 34 to move upwards, when the pin 341 enters the fourth section 364 from the first section 361 and the pin 341 enters the third section 363 from the fourth section 364, the unlocking block 355 just pushes the second locking tongue 351 to be disengaged from the lifting bracket 34.

The working principle of the limiting mechanism is as follows:

before the upper mold 31 is detached, as shown in fig. 3 and 4, the locking block 33, the lifting bracket 34, and the pushing block 35 are all in the low position, and the pin 341 is located at the bottom of the first section 361 of the guide groove 36; when the upper die 31 is disassembled, the upper die holder 30 and the lower die holder 40 are folded with each other, the lower die holder 40 extrudes the push block 35 to make the push block 35 go upwards, the second lock tongue 351 on the push block 35 pushes the lifting bracket 34 to go upwards to drive the lock block 33 to go upwards, at this time, the pin 341 goes upwards along the first section 361 of the guide groove 36 and pushes the first lock tongue 365 to enter the fourth section 364, when the unlocking pin 352 on the push block 35 collides with the unlocking block 355, the unlocking block 355 pushes the second lock tongue 351 to contract to separate the second lock tongue 351 from the lifting bracket 34, as shown in fig. 5, 6 and 7, at this time, the lifting bracket 34 goes downwards under the action of the first elastic unit 342, but because the pin 341 is blocked by the first lock tongue 365, the pin 341 can only slide along the top surface of the lock tongue to the V-shaped groove 364 of the fourth section of the guide groove 36, and the whole lifting bracket 34 and the lock block 33 are retained; thereafter, the upper die holder 30 is separated from the lower die holder 40, the clamping block 321 will automatically open and disengage from the connecting head 311 due to the loss of the constraint of the locking block 33, and the upper die 31 is retained in the die cavity 411; after the upper die holder 30 is separated from the lower die holder 40, the lower die 41 is integrally detached from the lower die holder 40, and the die is detached; when the mold is installed, the upper mold 31 is placed in the mold cavity 411 of the lower mold 41, then the lower mold 41 is integrally installed on the lower mold seat 40, the upper mold seat 30 and the lower mold seat 40 are controlled to be closed again, the lower mold seat 40 extrudes the push block 35 again to enable the push block 35 to move upwards, the push block 35 pushes the lifting support 34 to move upwards again, at this time, the pin 341 slides to the upper end of the third section 363 along the top wall of the fourth section 364 of the guide groove 36, the clamping block 321 is just clamped on two sides of the connecting head 311, when the unlocking pin 352 of the push block 35 is abutted against the unlocking block 355, the second lock tongue 351 is separated from the lifting support 34, the lifting support 34 moves downwards under the action of the first elastic unit 342, the locking block 33 is further driven to surround the outer side of the clamping block 321, fastening of the clamping block 321 and the connecting head 311 is realized, finally.

A fourth elastic unit 354 is arranged between the push block 35 and the upper die holder 30, and the fourth elastic unit 354 is assembled such that the elastic force thereof can drive the push block 35 to move downward relative to the upper die holder 30, thereby ensuring that the push block 35 can be reliably reset after the upper die holder 30 is separated from the lower die holder 40. The connector 311 is T-shaped, the two clamping blocks 321 are respectively arranged on two sides of the connector 311, and the locking block 33 is annular and sleeved on the convex column 32.

Further, as shown in fig. 9 and 10, the bottom mold 50 is provided with cushion blocks 51 corresponding to the mold cavities 411 one to one, the cushion blocks 51 are movably arranged in the vertical direction, a height adjusting mechanism for adjusting the height of the cushion blocks 51 is arranged in the bottom mold 50, and the height adjusting mechanism adjusts the height of the cushion blocks 51 according to the height of the filler required by different materials so as to change the height that the mold cavities 411 can accommodate the materials. According to the invention, the lifting type cushion block 51 is arranged on the traditional plane bottom membrane, the volume of the mold cavity 411 is adjusted by adjusting the height of the cushion block 51, the cushion block 51 is lifted to the corresponding height to control the filling amount during feeding, and the cushion block 51 is lowered to support the lower end of the mold cavity 411 at a low position after filling and before pressing, so that bricks with different thicknesses can be pressed by one set of mold, the equipment cost is reduced, the mold replacement frequency is reduced, and the production efficiency is improved.

Specifically, the height adjusting mechanism comprises a slot arranged at the bottom of the cushion block 51 and an inserting block 52 which is in sliding fit with the slot along the horizontal direction, the top surface of the inserting block 52 is in inclined surface fit with the top surface of the slot, and the cushion can be gradually jacked up when the inserting block 52 is inserted into the slot. The inserting block 52 is connected with the trough 70 in a sliding manner along the horizontal direction, a fifth elastic unit 53 is arranged between the inserting block 52 and the trough 70, the fifth elastic unit 53 is assembled to enable the elastic force of the fifth elastic unit 53 to drive the inserting block 52 to move towards the direction far away from the trough 70, and a limiting part 54 used for limiting the stroke of the inserting block 52 when moving towards the direction far away from the trough 70 is further arranged between the inserting block 52 and the trough 70; when the trough 70 moves towards the die cavity 411, the insert block 52 is firstly inserted into the slot to jack up the cushion block 51, the trough 70 realizes continuous movement by compressing the fifth elastic unit 53 and reaches the upper end of the die cavity 411, when the trough 70 moves towards the direction far away from the die cavity 411, the insert block 52 temporarily stays in the slot through the resilience of the fifth elastic unit 53 until the limiting part 54 between the insert block 52 and the trough 70 is blocked, the trough 70 drives the insert block 52 to be drawn out from the slot, and the cushion block 51 resets. According to the invention, the insert block 52 and the trough 70 are in linkage design, before the trough 70 is fed, the insert block 52 is driven to be inserted into the lower part of the cushion block 51, the height of the cushion block 51 is adjusted, then the trough 70 moves to the upper part of the lower die 41 to be filled, after filling is finished, the material at the upper end of the die cavity 411 is scraped by the trough 70, then the insert block 52 is driven to be drawn out of the cushion block 51, so that the cushion block 51 is reset, the cushion block 51 cannot float up and down due to the movement of the trough 70 in the whole filling process, and the filling precision is ensured.

Furthermore, a limiting component for limiting and adjusting the insertion depth of the insertion block 52 is arranged between the insertion block 52 and the slot; the limiting assembly comprises a stop block 55 arranged on the insertion block 52, the stop block 55 is in adjustable fixed connection with the insertion block 52 along the moving direction of the insertion block 52, and the stop block 55 is in blocking connection with the side wall of the bottom die 50; the stop block 55 is provided with a waist-shaped hole 551, the length direction of the waist-shaped hole 551 is parallel to the moving direction of the insertion block 52, the insertion block 52 is provided with a threaded hole 521 corresponding to the waist-shaped hole 551, a bolt 552 passes through the waist-shaped hole 551 and is connected with the threaded hole 521, the position of the limit block on the insertion block 52 is adjusted by loosening the bolt 552, and the relative fixed connection of the limit block and the insertion block 52 is realized by screwing the bolt 552. Before each work, the position of the stop block 55 is adjusted according to the designed thickness of the cement brick, the lifting height of the cushion block 51 is determined, then the subsequent operations of feeding, pressing and the like are started, and the cushion block 51 automatically floats up and down according to the position of the trough 70 in the whole pressing process without any manual operation.

Preferably, when the present invention is used for pressing cement bricks with a double-layer structure, two sets of hoppers 60 and troughs 70 are provided and are respectively located at two sides of the lower mold 41, the two troughs 70 are respectively provided with independent insertion blocks 52, and the two insertion blocks 52 are respectively matched with the slots staggered at the bottom of the cushion block 51. The two inserts 52 allow for independent adjustment of the packing height based on the design thickness of the two different materials. Be equipped with the auger delivery pole in the silo 70, the auger delivery pole is arranged with silo 70's activity direction parallel, and auger delivery does can ensure that the material is along die cavity 411 length direction equipartition. The bottom of the hopper 60 is provided with a movable door for discharging and stopping discharging.

Example 2

A cement brick static pressure forming method, change the mould of the above-mentioned cement brick static pressure forming machine according to the cement brick design specification, and adjust the packing height of the mould; the specific method for replacing the die comprises the following steps: the lower die holder 40 of the upper die base 30 is closed, the upper die 31 is inserted into the lowest end of the die cavity 411, the driving mechanism drives the quick connection mechanism to be disconnected, the upper die 31 falls into the die cavity 411, then the upper die 31 plate is separated from the lower die 41 plate, and then the lower die 41 is detached from the lower die 41 plate; placing a new upper die 31 into the die cavity 411 of the new lower die 41, installing the new lower die 41 on the lower die base 40, folding the upper die base 30 and the lower die base 40 again, driving the quick connection mechanism between the upper die base 30 and the new upper die 31 to be connected by the driving mechanism, and finally controlling the upper die base 30 to be separated from the lower die base 40 to finish die replacement; the specific method for adjusting the height of the filler comprises the following steps: the height adjusting mechanism adjusts the height of the cushion block 51 according to the required filler height before the cement brick is compacted so as to change the height of the material which can be accommodated in the die cavity 411; after the static pressure forming machine of the cement brick is debugged, putting cement materials into the hopper 60, and quantitatively putting the cement materials into the material groove 70 by the hopper 60, wherein overtravel feeding is adopted in the process, namely the feeding amount is larger than the material amount required by the forming of the cement brick; the trough 70 transfers the cement material to the upper part of the lower die 41, the cement material fills the die cavity 411, the vibration power source of the bottom die 50 continuously vibrates the lower die 41 in the process to compact the cement material, after the cement material fills the die cavity 411, the trough 70 moves reversely, and the scraper 71 scrapes off the redundant material at the upper end of the die cavity 411; then, the adjusting mechanism adjusts the cushion block 51 to the lowest point, the upper die 31 plate moves downwards to pre-press the filler, and when the forming height of the filler is 3-5 mm higher than the design height of the cement brick, the cylinder body of the hydraulic cylinder 12 starts to pressurize the upper die base 30 until the forming height reaches the design height of the cement brick; and finally, the hydraulic cylinder 12 is decompressed, the upper die base 30 and the lower die base 40 synchronously move upwards for a certain stroke, the bottom die 50 is moved out from the space below the lower die base 40, then the upper die base 30 and the lower die base 40 synchronously move downwards to enable the bottom surface of the lower die 41 to be close to a material receiving plate at the bottom of the forming machine, then the lower die base 40 is driven to move upwards while the height of the upper die base 30 is kept unchanged, the green bricks in the die cavity 411 fall off from the bottom of the die cavity 411 to the material receiving plate under the blocking of the upper die.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.

Claims

1. A static pressure forming method of cement bricks is characterized in that: replacing a mould of the static pressure forming machine of the cement brick according to the design specification of the cement brick, and adjusting the filling height of the mould; the static pressure forming machine for the cement bricks comprises a top beam (10), a base (20), an upper die base (30), a lower die base (40), an upper die (31), a lower die (41), a bottom die (50), a hydraulic cylinder (12), a hopper (60) and a trough (70); the top beam (10) and the base (20) are fixedly connected through a guide pillar (11) which is vertically arranged, the upper die holder (30) and the lower die holder (40) are arranged on the guide pillar (11) in a sliding mode, piston cylinders (13 and 14) used for driving the upper die holder (30) and the lower die holder (40) to move up and down are respectively arranged on the top beam (10) and the base (20), the upper die (31) is installed on the upper die holder (30), the lower die (41) is installed on the lower die holder (40), a die cavity (411) corresponding to the upper die (31) is arranged on the lower die (41), the hydraulic cylinder (12) is installed on the top beam (10), and a piston rod of the hydraulic cylinder (12) is arranged downwards and is abutted to the top surface of the upper die holder (; the bottom die (50) is arranged on the base (20) in a sliding mode along the horizontal direction, and a vibration power source is arranged on the bottom die (50); the hopper (60) is positioned above the side of the lower die holder (40), the trough (70) is positioned below the hopper (60), the trough (70) is arranged between the lower side of the hopper (60) and the top surface of the lower die (41) in a sliding mode along the horizontal direction, the bottom surface of the trough (70) is of a through structure, a scraper (71) is arranged on one side wall, away from the hopper (60), of the trough (70), and the bottoms of the trough (70) and the scraper (71) are attached to the top surface of the lower die (41); a quick connection mechanism is arranged between the upper die (31) and the upper die holder (30), a driving mechanism for driving the quick connection mechanism to be connected and disconnected is arranged on the upper die holder (30), and the lower die (41) is detachably connected with the lower die holder (40); the bottom die (50) is provided with cushion blocks (51) which correspond to the die cavities (411) one by one, the cushion blocks (51) are movably arranged along the vertical direction, and a height adjusting mechanism for adjusting the height of the cushion blocks (51) is arranged in the bottom die (50); the specific method for replacing the die comprises the following steps: folding the upper die holder (30) and the lower die holder (40) to enable the upper die (31) to be inserted into the bottommost end of the die cavity (411), driving the quick connection mechanism to be disconnected by the driving mechanism to enable the upper die (31) to fall into the die cavity (411), separating the upper die (31) plate from the lower die (41) plate, and then detaching the lower die (41) from the lower die (41) plate; putting a new upper die (31) into a die cavity (411) of a new lower die (41), installing the new lower die (41) on a lower die base (40), folding the upper die base (30) and the lower die base (40) again, driving a quick connection mechanism between the upper die base (30) and the new upper die (31) to be connected by a driving mechanism, and finally controlling the upper die base (30) to be separated from the lower die base (40) to finish die replacement; the specific method for adjusting the height of the filler comprises the following steps: the height adjusting mechanism adjusts the height of the cushion block (51) according to the required filler height before the cement brick is compacted so as to change the height of the material which can be accommodated in the die cavity (411); after the static pressure forming machine of the cement brick is debugged, putting cement materials into a hopper (60), quantitatively putting the cement materials into a material groove (70) by the hopper (60), and adopting overtravel feeding in the process, namely, the feeding amount is more than the material amount required by the forming of the cement brick; the trough (70) transfers the cement material to the upper part of the lower die (41), the cement material fills the die cavity (411), the vibration power source of the bottom die (50) continuously vibrates the lower die (41) in the process to compact the cement material, after the die cavity (411) is fully filled with the cement material, the trough (70) moves reversely, and the scraper (71) scrapes off the redundant material at the upper end of the die cavity (411); then, the adjusting mechanism adjusts the cushion block (51) to the lowest point, the upper die (31) plate moves downwards to pre-press the filler, when the forming height of the filler is 3-5 mm higher than the design height of the cement brick, the cylinder body of the hydraulic cylinder (12) starts to pressurize the upper die base (30) until the forming height reaches the design height of the cement brick; finally, the hydraulic cylinder (12) is decompressed, the upper die holder (30) and the lower die holder (40) synchronously move upwards for a stroke, the bottom die (50) is moved out from the space below the lower die holder (40), then the upper die holder (30) and the lower die holder (40) synchronously move downwards to enable the bottom surface of the lower die (41) to be close to a material receiving plate at the bottom of the forming machine, then the lower die holder (40) is driven to move upwards while the height of the upper die holder (30) is kept unchanged, a brick blank in the die cavity (411) falls off from the bottom of the die cavity (411) to the material receiving plate under the blocking of the upper die (31), and the forming;

upper die base (30) bottom is equipped with projection (32) that the downward projection set up, go up mould (31) and install at projection (32) lower extreme, connect the mechanism soon including connecting head (311) that set up on last mould (31) top surface, connecting head (311) have horizontal protruding portion, projection (32) lower extreme is equipped with clamp splice (321), clamp splice (321) are assembled and are removed between following two stations: in the first station, a clamping block (321) is embedded below the protruding part to limit the vertical displacement between the convex column (32) and the connector (311); in the second station, the clamping block (321) is moved out from the lower part of the protruding part so that the convex column (32) and the connecting head (311) can be relatively displaced along the vertical direction; the quick-connecting mechanism further comprises a locking block (33), the locking block (33) is movably arranged along the vertical direction, and the locking block (33) moves between the following two heights: the locking block (33) is transversely abutted with the clamping block (321) at the first station at a first height so as to prevent the clamping block (321) from moving out of the lower part of the protruding part; the locking block (33) laterally avoids the clamping block (321) so that the clamping block (321) can move out from the position below the protruding part; the matching surface between the clamping block (321) and the protruding part is an inclined surface, and when the locking block (33) is positioned at the second station and the convex column (32) is separated from the connecting head (311) upwards, the clamping block (321) can move out from the lower part of the protruding part under the action of the inclined surface; the driving mechanism is used for driving the locking block (33) to move between a first height and a second height;

the height two position is located above the height one position, the driving device comprises a lifting support (34) arranged at the upper end of a convex column (32), the lifting support (34) is fixedly connected with a locking block (33) through a connecting rod (331) relatively, a first elastic unit (342) is arranged between the lifting support (34) and an upper die base (30), the first elastic unit (342) is assembled into a state that the elastic force of the first elastic unit can drive the lifting support (34) to move downwards, a push block (35) movably arranged along the vertical direction is arranged at the bottom of the upper die base (30), the push block (35) is connected with the bottom surface of the lifting support (34) in a blocking mode, and when the upper die base (30) and a lower die base (40) are folded, the top surface of the lower die base (40) extrudes the push block (35) to jack the lifting support (34) and enable the locking block (33) to be lifted to the height two.

2. The method of claim 1, wherein the method comprises: the clamping block (321) is pivoted with the convex column (32), the clamping block (321) is provided with a first side surface (3211) matched with the convex part and a second side surface (3212) which is back-to-back with the first side surface (3211), the first side surface (3211) is provided with a convex part used for blocking and connecting with the bottom surface of the convex part, and the second side surface (3212) is positioned on a vertical moving path of the locking block (33); when the locking block (33) moves from the second height to the first height, the locking block (33) pushes the second side surface (3212) to enable the clamping block (321) to swing, and further enable the protruding part of the first side surface (3211) to swing to the position below the protruding part; chamfers are arranged at the upper end of the protruding part and the lower end of the second side surface (3212), and when the locking block (33) is located at the second station and the convex column (32) is folded downwards with the connecting head (311), the clamping block (321) can automatically open under the guidance of the chamfers.

3. The method of claim 1, wherein the method comprises: a limiting mechanism is arranged between the lifting support (34) and the upper die holder (30), the limiting mechanism comprises a pin column (341) arranged on the lifting support (34) and a guide groove (36) arranged on the upper die holder (30), the pin column (341) is installed on a sliding block (343), and the sliding block (343) is in sliding connection with the lifting support (34) along the horizontal direction; the guide groove (36) comprises a first section (361) which is vertically arranged and a second section (362) which is obliquely arranged upwards from the lower end of the first section (361), a third section (363) is vertically arranged at the upper end of the second section (362), the upper end of the third section (363) is communicated with the upper end of the first section (361) through a V-shaped fourth section (364), the inflection point of the upper inner wall of the fourth section (364) and the inflection point of the lower inner wall are arranged in a staggered mode, the inflection point of the upper inner wall is deviated to one side where the first section (361) is located, and the inflection point of the lower inner wall is deviated to one side where the third section (363) is located; the pin column (341) protrudes into the guide groove (36); a first locking tongue (365) is arranged between the upper end of the first section (361) and the fourth section (364), the first locking tongue (365) is arranged on the side wall of the first section (361) in a sliding mode, one end of the first locking tongue (365) protrudes into the first section (361), the other end of the first locking tongue (365) is provided with a second elastic unit (366), the second elastic unit (366) is assembled to enable the first locking tongue (365) to slide towards the first section (361) under the elastic force of the second elastic unit, a slope is arranged below the first locking tongue (365), the top surface of the first locking tongue (365) is flush with the inner wall of the lower side of the fourth section (364), when the pin column (341) moves upwards from the lower end of the first section (361), the first locking tongue (365) can be pushed away and enters the fourth section (364), and when the pin column (341) falls back, the first locking tongue (365) can slide to the V-shaped groove of the fourth section (364) along the top surface of the first; when the pin (341) moves upwards from the V-shaped groove of the fourth section (364), the pin can slide to the upper end of the third section (363) under the guidance of the upper side inner wall of the fourth section (364), and when the pin (341) falls back, the pin can fall back to the lower end of the first section (361) along the third section (363) and the second section (362) in sequence; the locking block (33) is at the first height when the pin (341) is located at the lower end of the first section (361), and the locking block (33) is at the second height when the pin (341) is located in the V-shaped groove of the fourth section (364).

4. The method of claim 3, wherein: the lifting support is characterized in that a second lock tongue (351) is arranged on the push block (35), the second lock tongue (351) is connected with the lifting support (34) in a blocking mode, a third elastic unit (353) is arranged between the second lock tongue (351) and the push block (35), the third elastic unit (353) is assembled to enable the second lock tongue (351) to move to one side where the lifting support (34) is located through elasticity, the top surface of the second lock tongue (351) is a plane, the bottom surface of the second lock tongue (351) is an inclined surface, when the lifting support (34) moves downwards relative to the push block (35), the second lock tongue (351) can be blocked by the second lock tongue (351), and when the lifting support (34) moves upwards relative to the push block (35), the second lock tongue (351) can be pushed away to move to the upper side of the second lock tongue (351); the second lock bolt (351) is provided with an unlocking pin (352), the upper die holder (30) is provided with an unlocking block (355), the unlocking block (355) is provided with an inclined plane, the inclined plane is positioned on a vertical movement path of the unlocking pin (352), and when the pushing block (35) passes through the unlocking block (355) from bottom to top, the unlocking pin (352) can drive the second lock bolt (351) to move towards the direction far away from the lifting support (34) under the guide of the inclined plane of the unlocking block (355) and enable the second lock bolt (351) to be separated from the lifting support (34); the height of the unlocking block (355) is set as: in the process that the pushing block (35) pushes the lifting bracket (34) to move upwards, when the pin (341) enters the fourth section (364) from the first section (361) and the pin (341) enters the third section (363) from the fourth section (364), the unlocking block (355) just pushes the second lock tongue (351) to be separated from the lifting bracket (34); a fourth elastic unit (354) is arranged between the push block (35) and the upper die holder (30), and the fourth elastic unit (354) is assembled to enable the elastic force of the fourth elastic unit to drive the push block (35) to move downwards relative to the upper die holder (30).

5. The method of claim 1, wherein the method comprises: the die block (50) is provided with cushion blocks (51) in one-to-one correspondence with the die cavity (411), the cushion blocks (51) are movably arranged along the vertical direction, a height adjusting mechanism used for adjusting the height of the cushion blocks (51) is arranged in the die block (50), and the height of the cushion blocks (51) is adjusted by the height adjusting mechanism according to the height of fillers required by different materials so as to change the height of the materials which can be accommodated in the die cavity (411).

6. The method of claim 5, wherein: the height adjusting mechanism comprises a slot arranged at the bottom of the cushion block (51) and an inserting block (52) which is in sliding fit with the slot along the horizontal direction, the top surface of the inserting block (52) is in inclined surface fit with the top surface of the slot, and the cushion can be gradually jacked up when the inserting block (52) is inserted into the slot.

7. The method of claim 6, wherein: the inserting block (52) is connected with the trough (70) in a sliding mode along the horizontal direction, a fifth elastic unit (53) is arranged between the inserting block (52) and the trough (70), the fifth elastic unit (53) is assembled to enable the elastic force of the fifth elastic unit to drive the inserting block (52) to move towards the direction far away from the trough (70), and a limiting part (54) used for limiting the stroke of the inserting block (52) when the inserting block moves towards the direction far away from the trough (70) is further arranged between the inserting block (52) and the trough (70); when silo (70) moved to die cavity (411), inserted block (52) inserted the slot earlier and with cushion (51) jack-up, silo (70) realized continuing the motion and reached die cavity (411) upper end through compressing fifth elastic element (53), when silo (70) moved to the direction of keeping away from die cavity (411), inserted block (52) temporarily stayed in the slot through the resilience of fifth elastic element (53), when spacing portion (54) fender between inserted block (52) and silo (70) connect, silo (70) drove inserted block (52) and taken out from the slot, cushion (51) reset.

8. The method of claim 7, wherein: a limiting component used for limiting and adjusting the insertion depth of the insertion block (52) is further arranged between the insertion block (52) and the slot; the limiting assembly comprises a stop block (55) arranged on the insert block (52), and the stop block (55) is in blocking connection with the side wall of the bottom die (50); the stop block (55) is provided with a waist-shaped hole (551), the length direction of the waist-shaped hole (551) is parallel to the moving direction of the insertion block (52), the insertion block (52) is provided with a threaded hole (521) corresponding to the waist-shaped hole (551), a bolt (552) penetrates through the waist-shaped hole (551) and is connected with the threaded hole (521), the position of the limiting block on the insertion block (52) is adjusted by loosening the bolt (552), and the relative fixed connection of the limiting block and the insertion block (52) is realized by screwing the bolt (552).