CN111296996B

CN111296996B - Cutting mechanism for shoemaking

Info

Publication number: CN111296996B
Application number: CN202010259254.0A
Authority: CN
Inventors: 宋建华
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2021-08-17
Anticipated expiration: 2040-04-03
Also published as: CN111296996A

Abstract

The invention discloses a cutting mechanism for shoemaking, which is characterized by comprising a base, wherein a support frame is arranged on the base, a lifting assembly cutter assembly and a material pushing assembly are connected onto the support frame, the cutter assembly comprises a finished product cutter and waste material cutters fixed on four corners of the finished product cutter, a storage cavity is arranged at the upper end of the base, a lower die is arranged at the upper end of the storage cavity, a material cutting opening for the finished product cutter to extend into and be communicated with the storage cavity is formed in the lower die, a waste material cutting groove for the waste material cutter to be embedded into is formed in the lower die, a recovery frame is arranged in the circumferential direction of the lower die, the storage cavity is communicated with the front side of the base, a collection frame is arranged in the storage cavity, and when the lifting assembly drives the lower die to descend to a proper position, the material pushing assembly can push waste materials into the recovery frame. The invention has the functions of convenient cleaning of the cut waste and convenient storage.

Description

Cutting mechanism for shoemaking

Technical Field

The invention relates to the field of cutting, in particular to a cutting mechanism for shoemaking.

Background

The cutting machine is the more than indispensable processing machine of shoemaking in-process, and the guillootine is used for cutting into the suitable material of size, the later stage processing of being convenient for with the cladding usually.

As shown in fig. 1, the cutting mechanism comprises a base 1, a finished product cutter 41 and a lower die 7 are arranged on the base 1, the finished product cutter 41 is connected with a lifting assembly 3, a storage cavity 11 is arranged below the lower die 7, the storage cavity 11 is communicated with the front side of the base 1, a collection frame 9 is arranged in the storage cavity, and a finished product cutting groove 71 communicated with the storage cavity 11 is arranged in the lower die 7.

Foretell cutting machine is at the during operation, the material that will wait to tailor is placed in 7 tops of lower mould, then move down through 3 drive lower moulds of lifting unit 7 for thereby the cutter embedding cuts off the intracavity and cuts into the material and cut off the chamber size, can leave the waste material after cutting in 7 tops of lower mould simultaneously, people need clear away the rear with the waste material and can go on before cutting, and receive extruded material and adhere easily on last membrane, make people take off the waste material convenient inadequately, influence people's process velocity.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the cutting mechanism for shoemaking, which has the functions of conveniently removing and storing cut waste materials.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a cutting mechanism for shoemaking, includes the base, is equipped with the support frame on the base, be connected with lifting unit on the support frame, last cutter unit and the material pushing component of being connected with of lifting unit, cutter unit includes the finished product cutter and fixes the waste material cutter on finished product cutter four corners, the base upper end is equipped with deposits the chamber, and the upper end of depositing the chamber is equipped with the lower mould, is equipped with on the lower mould and supplies the finished product cutter to stretch into and with deposit the blank mouth of chamber intercommunication, be equipped with the waste material grooving that supplies the embedding of waste material cutter on the lower mould, the circumference of lower mould is equipped with retrieves the frame, deposits the front side intercommunication of chamber and base, deposits the intracavity and is equipped with the collection frame, when lifting unit drives cutter unit and pushes away the material subassembly and descends and targets in place, it can dial the waste material into in retrieving the frame to push away the material subassembly.

Through adopting above-mentioned technical scheme, when cutting the material, place the material in lower mould top, then start lifting unit and make it drive the finished product cutter and move down, when lifting unit drove the waste material cutter and inserts in the waste material grooving, lifting unit stop motion, the cutting of completion material is cut in the last undercut insertion blank mouth this moment, the material after the cutting falls into and collects the frame, simultaneously the waste material cutter inserts in the waste material grooving and makes the waste material cut into four minutes, then start to push away the material subassembly and dial the waste material into the recovery frame in, so accomplish the cutting of a material, thereby make the waste material can pile up regularly clearing up in retrieving the frame after cutting, people need not once the material clearance of every cutting, thereby improved cutting efficiency, and the waste material is cut into the multistage, change in depositing.

The invention is further configured to: the lifting assembly comprises a lifting cylinder fixed on the supporting frame, a piston rod of the lifting cylinder faces downwards and is fixed with a connecting block, an installation block is fixed at the lower end of the connecting block, a finished product cutter is fixed at the lower end of the installation block, a first magnetic switch and a second magnetic switch are installed on the lifting cylinder, and the first magnetic switch is located at the upper end of the second magnetic switch.

Through adopting above-mentioned technical scheme, can drive connecting block and installation piece up-and-down motion through the lift cylinder, and then drive finished product cutter up-and-down motion, when lift cylinder piston rod descends and triggers second magnetic switch, lift cylinder piston rod stops to move down, and the finished product cutter inserts the blank intracavity this moment, and in the waste material cutter inserted the waste material grooving, material cutting and waste material cutting all accomplished.

The invention is further configured to: the automatic cutting device is characterized in that four sliding grooves are formed in the mounting block and are respectively located in four directions, namely the front direction, the rear direction, the left direction and the right direction of a finished product cutter, the pushing assembly comprises a pushing rod which is slidably arranged in the sliding grooves, a pushing plate is fixed at the lower end of the pushing rod, a first limit switch and a second limit switch which are fixed to the lower side of the mounting block are respectively arranged at two ends of the sliding grooves, the second limit switch is closer to the finished product cutter relative to the first limit switch, a rotating ring which is rotatably connected with the mounting block is arranged at the upper end of the pushing rod, four pushing grooves are formed in the lower end of the rotating ring and are Archimedes spiral grooves, the upper end of the pushing rod is inserted into the pushing grooves, the outer side wall of the rotating ring is provided with teeth, a supporting frame which is fixed with the mounting block is arranged on the outer side of the rotating ring, a pushing motor is fixed in the supporting frame, and a driving gear which is meshed with the outer side of the rotating shaft of the pushing motor.

Through adopting above-mentioned technical scheme, when the piston rod of lift cylinder descends to when triggering second magnetic switch, the material is cut and the waste material is cut into four, start the rotating electrical machines this moment and drive the driving gear and rotate, and then drive rotatory ring and rotate, make the push rod slide to the one end of keeping away from the finished product cutter, thereby drive the push pedal and slide to retrieving the frame, make the push pedal can push the waste material in retrieving the frame, after the push pedal contacts with first limit switch, the rotating electrical machines reversal makes the push pedal rebound until push pedal and second limit switch contact, the rotating electrical machines stall, make the push pedal return the normal position and be convenient for push away the material next time, start the lift cylinder simultaneously and drive the finished product cutter and shift up until triggering first magnetic switch, make the finished product cutter return the normal position and be convenient for people to place the.

The invention is further configured to: the circumference of lower mould is equipped with the constant head tank, retrieve in the frame embedding constant head tank.

Through adopting above-mentioned technical scheme, retrieve the frame and be difficult for sliding in the constant head tank, the push pedal of being convenient for pushes the waste material in retrieving the frame.

The invention is further configured to: first location magnet has been inlayed to the bottom of constant head tank, retrieve in the frame embedding constant head tank and retrieve the bottom of frame and inlay second location magnet, be equipped with the vibration board in the recovery frame, the vibration board lower extreme is connected through a plurality of vibrating spring and the bottom of retrieving the frame, and the lower extreme of vibration board is fixed with the vibrator.

Through adopting above-mentioned technical scheme, when lift cylinder drives the finished product cutter at every turn and rises, start the vibrator and make the vibration board vibrate from top to bottom to make the waste material of collecting in the frame stack inseparabler, be convenient for stack more waste materials, and inlay first location magnet in the bottom of constant head tank, the bottom of retrieving the frame has inlayed second location magnet, and the cooperation through first location magnet and second location magnet makes the difficult vertical vibration of frame of retrieving.

The invention is further configured to: the last extrusion subassembly that is connected with of lifting unit, the extrusion subassembly is including fixing four extrusion cylinders at the installation piece downside, and four extrusion cylinders are located the four sides of finished product cutter respectively and are located the spout and keep away from one side of finished product cutter, the piston rod of extrusion cylinder is down and be fixed with flexible subassembly, the downside that flexible subassembly is close to finished product cutter one end is fixed with the extrusion spring, the lower extreme of extrusion spring is fixed with the extrusion piece, is equipped with the guide bar fixed with the extrusion piece in the extrusion spring, and the guide bar passes adjacent expansion plate.

By adopting the technical scheme, before the piston rod of the lifting cylinder moves downwards, the piston rod of the extrusion cylinder moves downwards to enable the extrusion block to move downwards to be closer to the lower die and lower than the finished product cutter, then, when the piston rod of the lifting cylinder moves downwards, the extrusion block can preferentially contact with the material and extrude the material, so that the material is not easy to slide, so that the material is not easy to slide when the finished product cutter cuts the material, the cutting effect is improved, and after the second magnetic switch is triggered, the extrusion cylinder moves upwards to prevent the extrusion block from contacting with the material, at the moment, the rotating motor is started to enable the push plate to push the waste material into the recovery frame, the push plate can extrude the retractable plate component to enable the retractable plate component to retract, so that the extrusion block and the retractable plate component can not influence the push plate to push the waste materials into the recovery frame, and after the push plate returns to the original position, the extrusion block can return to the original position under the action of the extension spring, so that the material can be extruded next time.

The invention is further configured to: the telescopic assembly of the telescopic assembly is formed by sleeving a plurality of telescopic plates, the telescopic plates are increased one by one from inside to outside, and adjacent telescopic plates are connected through telescopic springs.

Through adopting above-mentioned technical scheme, each expansion plate cup joints together and makes, in the expansion plate retractable into the adjacent outside expansion plate for flexible subassembly can influence the push pedal and push the waste material in pushing the waste material frame.

In conclusion, the invention has the following beneficial effects:

1. when the materials are cut, the residual waste materials are cut at the same time, and the waste materials are pushed into the recovery frame through the push plate to be stacked in a concentrated manner, so that people do not need to manually clean the waste materials on the lower die after each cutting, and the whole cutting efficiency is improved;

2. the material is positioned through the dual functions of the extrusion block and the suction nozzle, so that the material is not easy to slide when being cut, the cutting effect is improved, the material is not easy to generate shielding, and the yield is improved.

Drawings

FIG. 1 is a schematic diagram of a cutting mechanism in the prior art;

FIG. 2 is a schematic structural diagram of the present embodiment;

FIG. 3 is a schematic structural diagram of another perspective of the present embodiment;

FIG. 4 is an exploded view highlighting the lifting assembly, blanking assembly, pusher assembly and extrusion assembly of the present embodiment;

FIG. 5 is a schematic sectional view of the present embodiment;

FIG. 6 is an enlarged schematic view of FIG. 5 at A;

fig. 7 is an enlarged schematic view at B of fig. 5.

Reference numerals: 1. a base; 2. a support frame; 3. a lifting assembly; 4. a material cutting assembly; 5. an extrusion assembly; 6. a material pushing assembly; 7. a lower die; 8. a recovery frame; 9. a collection frame; 11. a storage chamber; 12. a first positioning magnet; 31. a lifting cylinder; 32. connecting blocks; 33. mounting blocks; 311. a first magnetic switch; 312. a second magnetic switch; 331. a chute; 41. a finished product cutter; 42. a waste cutter; 51. an extrusion cylinder; 52. a telescoping assembly; 53. a compression spring; 54. extruding the block; 55. a guide bar; 521. a retractable plate; 522. a tension spring; 61. a push rod; 62. pushing the plate; 63. a first limit switch; 64. a second limit switch; 65. a rotating ring; 66. a mounting frame; 67. a material pushing motor; 68. a driving gear; 651. pushing the groove; 71. cutting a groove on the finished product; 72. cutting a groove in the waste material; 73. positioning a groove; 81. a vibrating plate; 82. a vibration spring; 83. a vibrator; 84. a second positioning magnet.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment discloses cutting mechanism for shoemaking, as shown in fig. 2 and 3, including base 1, be fixed with support frame 662 on the base 1, be connected with lifting unit 3 on the support frame 662, last blank subassembly 4, extrusion subassembly 5 and the material pushing component 6 of being connected with of lifting unit 3, be equipped with on base 1 and deposit chamber 11, the upper end of depositing chamber 11 is equipped with lower mould 7, circumference at lower mould 7 is equipped with retrieves frame 8, deposit the front side intercommunication of chamber 11 and base 1, it is equipped with collection frame 9 to deposit the intracavity 11, it is equipped with the handle to collect frame 9 front side.

As shown in fig. 4 and 5, the lifting assembly 3 includes a lifting cylinder 31 fixed on a support frame 662, the lifting cylinder 31 is provided with a first magnetic switch 311 and a second magnetic switch 312, and the first magnetic switch 311 is located at the upper end of the second magnetic switch 312. The piston rod of the lifting cylinder 31 faces downwards and is fixed with a connecting block 32, and the lower end of the connecting block 32 is fixed with a mounting block 33. The blank assembly 4 comprises a finished product cutter 41 at the lower end of the fixed mounting block 33 and waste material cutters 42 fixed at four corners of the finished product cutter 41, a finished product cutting groove 71 for the finished product cutter 41 to cut into and communicated with the storage cavity 11 is arranged on the lower die 7, and a waste material cutting groove 72 for the waste material cutter 42 to be embedded into is arranged at the upper end of the lower die 7.

As shown in fig. 4, 5 and 6, the extruding assembly 5 includes four extruding cylinders 51 fixed on the lower side of the mounting block 33, the four extruding cylinders 51 are respectively located on four sides of the finished product cutter 41 and located on one side of the sliding groove 331 away from the finished product cutter 41, a piston rod of the extruding cylinder 51 faces downward and is fixed with a telescopic assembly 52, the telescopic assembly 52 is formed by sleeving a plurality of telescopic plates 521, the telescopic plates 521 are gradually enlarged from inside to outside, adjacent telescopic plates 521 are connected through a telescopic spring 522, an extruding spring 53 is fixed at the lower end of the telescopic plate 521 close to the finished product cutter 41, an extruding block 54 is fixed at the lower end of the extruding spring 53, a guide rod 55 fixed with the extruding block 54 is arranged in the extruding spring 53, and the guide rod 55 passes through the adjacent telescopic plates 521.

When cutting materials, the materials are placed above the lower die 7, the extrusion cylinder 51 is started firstly to enable the extrusion block 54 to be closer to the lower die 7, the lifting cylinder 31 is started to enable the lifting cylinder to drive the finished product cutter 41 and the extrusion block 54 to move downwards, the extrusion block 54 can be contacted with the materials firstly and extrudes the materials in the downward moving process, the materials are not prone to sliding, when the magnetic switch is triggered, the piston rod of the lifting cylinder 31 stops moving downwards, the finished product cutter 41 is inserted into the finished product cutting groove 71 to enable the cut materials to fall into the collection frame 9, meanwhile, the waste material cutter 42 is inserted into the waste material cutting groove 72, and at the moment, the waste materials at the upper end of the lower die 7 are cut into a plurality of pieces by the waste material cutter 42.

As shown in fig. 4, 5 and 6, four sliding grooves 331 are provided on the mounting block 33, the pushing assembly 6 includes a pushing rod 61 slidably disposed in the sliding grooves 331, a pushing plate 62 is fixed at a lower end of the pushing rod 61, and the four pushing plates 62 are respectively located in front, rear, left and right directions of the finished product cutter 41. The two ends of the sliding groove 331 are provided with a first limit switch 63 and a second limit switch 64 fixed with the lower side of the mounting block 33, and the second limit switch 64 is closer to the finished product cutter 41 relative to the first limit switch 63. A rotating ring 65 is rotatably connected to the upper end of the mounting block 33, the outer side wall of the rotating ring 65 has teeth, four push grooves 651 are provided at the lower end of the rotating ring 65, the push grooves 651 are archimedes spiral grooves, and the upper end of the push rod 61 is inserted into the push grooves 651. A support frame 662 is arranged on the outer side of the rotating ring 65, a material pushing motor 67 is fixed in the support frame 662, and a driving gear 68 engaged with the outer side of the rotation is fixed on a rotating shaft of the material pushing motor 67. When the pushing motor 67 rotates, the driving gear 68 can be driven to rotate, so as to drive the rotating ring 65 to rotate, and further, the sliding of the push rod 61 and the push plate 62 is realized.

When the second magnetic switch 312 is triggered, the lower end surface of the push plate 62 is slightly higher than the upper end surface of the lower die 7, at this time, the piston rod of the extrusion cylinder 51 moves upwards to make the extrusion block 54 move upwards and separate from the material, then the rotating motor is started to make the push plate 62 move towards the direction far away from the finished product cutter 41, the push plate 62 contacts with the expansion plate 521 and compresses each expansion spring 522, so that the extrusion block 54 moves towards the direction far away from the finished product cutter 41, meanwhile, the push plate 62 pushes the waste material left above the lower die 7 after cutting into the collection frame 9, after the push plate 62 contacts with the first limit switch 63, the rotating motor rotates reversely to make the push plate 62 and the push rod 61 move towards the finished product cutter 41 until the push plate 62 contacts with the second limit switch 64, the rotating motor stops rotating and simultaneously starts the lifting cylinder 31 to drive the finished product cutter 41 to move upwards, so as to facilitate next cutting, and the extrusion block 54 can return to the original position under the action of each expansion spring 522, the material is extruded when being convenient for cut next time. So make people only need clear up the waste material after retrieving frame 8 and piling up the waste material, need not to clear up waste material once at every turn after cutting, improved cutting speed, the waste material is convenient for stack less through cutting shared space simultaneously.

As shown in fig. 5 and 7, a positioning groove 73 is provided in the circumferential direction of the lower die 7, and the bottom of the recovery frame 8 is fitted into the positioning groove 73. Be equipped with vibration board 81 in retrieving frame 8, the vibration board 81 lower extreme is connected with the bottom of retrieving frame 8 through a plurality of vibrating spring 82, the lower extreme of vibration board 81 is fixed with vibrator 83, when lift cylinder 31 drives finished product cutter 41 at every turn and rises, start vibrator 83 and make vibration board 81 vibrate from top to bottom, thereby make the waste material of collecting in the frame 9 stack inseparabler, be convenient for stack more waste materials, and first positioning magnet 12 has been inlayed to the bottom at constant head tank 73, the bottom of retrieving frame 8 has inlayed second positioning magnet 84, make through the cooperation of first positioning magnet 12 and second positioning magnet 84 retrieve frame 8 and be difficult for vibration from top to bottom.

The specific cutting process comprises the following steps: firstly, a material is placed on the lower die 7, then the extrusion cylinder 51 is started to enable the lower end of the extrusion block 54 to descend to be lower than the finished product cutter 41, then the lifting cylinder 31 is started to enable the piston rod of the extrusion block to move downwards, so that the finished product cutter 41 and the extrusion block 54 are driven to move downwards until the second magnetic switch 312 is triggered, the extrusion block 54 firstly contacts with the material and extrudes the material to realize material positioning in the descending process, the piston rod of the lifting cylinder 31 stops moving after the second magnetic switch 312 is triggered, at the moment, the material is cut by the finished product cutter 41, the finished product falls into the collection frame 9, meanwhile, the waste material is cut into four sections by the waste material cutter 42, then the extrusion cylinder 51 is started to enable the extrusion block 54 to move upwards to be separated from the material, meanwhile, the rotating motor is started, so that the waste material is pushed into the recovery frame 8 by the push plate 62, after the push plate 62 contacts with the first limit switch 63, the motor rotates reversely to enable the push plate 62 to return to be in a position until the push plate 62 contacts with the second limit switch 64, at this moment, the lifting cylinder 31 is started to drive the finished product cutter 41 to move upwards and return, so that the material is cut, the cut waste is pushed into the recovery frame 8 to be centrally stacked, people do not need to manually clear up the waste on the lower die 7 after cutting at every time, and the whole cutting effect is improved

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a decide mechanism for shoemaking, includes base (1), is equipped with support frame (2) on base (1), its characterized in that: the cutting device is characterized in that a lifting assembly (3) is connected onto the supporting frame (2), a cutting assembly (4) and a pushing assembly (6) are connected onto the lifting assembly (3), the cutting assembly (4) comprises a finished product cutter (41) and waste material cutters (42) fixed on four corners of the finished product cutter (41), a storage cavity (11) is formed in the upper end of the base (1), a lower die (7) is arranged at the upper end of the storage cavity (11), finished product cutting grooves (71) which are used for the finished product cutter (41) to stretch into and communicated with the storage cavity (11) are formed in the lower die (7), waste material cutting grooves (72) which are used for the waste material cutters (42) to be embedded into are formed in the lower die (7), a recovery frame (8) is arranged in the circumferential direction of the lower die (7), the storage cavity (11) is communicated with the front side of the base (1), a collection frame (9) is arranged in the storage cavity (11), and when the lifting assembly (3) drives the cutting assembly (4) and the pushing assembly (6) to descend in place, push away material subassembly (6) and can dial the waste material into in retrieving frame (8), lifting unit (3) are including fixing lift cylinder (31) on support frame (2), the piston rod of lift cylinder (31) is down and be fixed with connecting block (32), and the lower extreme of connecting block (32) is fixed with installation piece (33), and the lower extreme at installation piece (33) is fixed in finished product cutter (41), install first magnetic switch (311) and second magnetic switch (312) on lift cylinder (31), first magnetic switch (311) are located second magnetic switch (312) upper end, be equipped with four spout (3) on installation piece (33)31) Four chutes (331) are respectively positioned in front of the finished product cutter (41)The rear left and right directions, the pushing assembly (6) comprises a push rod (61) which is slidably arranged in a sliding groove (331), a push plate (62) is fixed at the lower end of the push rod (61), a first limit switch (63) and a second limit switch (64) which are fixed with the lower side of the mounting block (33) are respectively arranged at the two ends of the sliding groove (331), the second limit switch (64) is closer to the finished product cutter (41) relative to the first limit switch (63), a rotating ring (65) which is rotatably connected with the mounting block (33) is arranged at the upper end of the push rod (61), four pushing grooves (651) are arranged at the lower end of the rotating ring (65), the pushing grooves (651) are Archimedes spiral grooves, the upper end of the push rod (61) is inserted into the pushing groove (651), the toothed outer side wall of the rotating ring (65) is provided with a mounting frame (66) which is fixed with the mounting block (33), a pushing motor (67) is fixed in the mounting, a driving gear (68) meshed with the outer side of the rotating ring (65) is fixed on the rotating shaft of the pushing motor (67).

2. The cutting mechanism for shoemaking according to claim 1, characterized in that: the circumference of lower mould (7) is equipped with constant head tank (73), retrieve in frame (8) embedding constant head tank (73).

3. The cutting mechanism for shoemaking according to claim 2, characterized in that: first location magnet (12) have been inlayed to the bottom of constant head tank (73), retrieve in frame (8) embedding constant head tank (73) and retrieve the bottom of frame (8) and inlay second location magnet (84), be equipped with vibration board (81) in retrieving frame (8), vibration board (81) lower extreme is connected with the bottom of retrieving frame (8) through a plurality of vibrating spring (82), and the lower extreme of vibration board (81) is fixed with vibrator (83).

4. The cutting mechanism for shoemaking according to claim 1, characterized in that: the mounting block (33) is evenly provided with four sliding grooves (331), the four sliding grooves (331) are respectively positioned at the outer sides of four sides of a finished product cutter (41), the lifting component (3) is connected with an extrusion component (5), the extrusion component (5) comprises four extrusion cylinders (51) fixed at the lower side of the mounting block (33), the four extrusion cylinders (51) are respectively positioned at the four sides of the finished product cutter (41) and positioned at one side of the sliding grooves (331) far away from the finished product cutter (41), a piston rod of the extrusion cylinder (51) faces downwards and is fixed with a telescopic component (52), the lower side of one end, close to the finished product cutter (41), of the telescopic component (52) is fixed with an extrusion spring (53), the lower end of the extrusion spring (53) is fixed with an extrusion block (54), a guide rod (55) fixed with the extrusion block (54) is arranged in the extrusion spring (53), and the telescopic component (52) is formed by sleeving a plurality of telescopic plates (521), the expansion plates (521) are enlarged one by one from inside to outside, the adjacent expansion plates (521) are connected through expansion springs (522), and the guide rod (55) penetrates through the adjacent expansion plates (521).