CN111497183A

CN111497183A - Sealing rubber strip extrusion die

Info

Publication number: CN111497183A
Application number: CN202010365961.8A
Authority: CN
Inventors: 钱杰; 朱涛; 钱建伟; 周小英
Original assignee: Changzhou Chuangyou Plastic Co ltd
Current assignee: Changzhou Chuangyou Plastic Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-08-07

Abstract

The invention relates to a sealing rubber strip extrusion die, which is applied to the technical field of rubber extrusion dies and comprises a feeding die and a forming die which are connected through a bolt, wherein the feeding die and the forming die are respectively provided with a feeding cavity and a forming cavity; the regulating part comprises a regulating frame and a cover plate, a plurality of double-screw bolts are connected in the regulating frame in a threaded manner, a lug is arranged at one end of each double-screw bolt, a mold core end face is provided with a middle block, one end of each middle block extends into the regulating frame, the lug corresponds to the side edge of the middle block in a one-to-one manner and is in contact with the side edge of the corresponding middle block in a mutually abutting manner, the cover plate is connected with the regulating frame through a first countersunk head screw, a plurality of limiting rods are arranged on the side wall of the regulating frame, sunken grooves for embedding the limiting rods. The invention has the effect of improving the flexibility of the die.

Description

Sealing rubber strip extrusion die

Technical Field

The invention relates to the technical field of rubber extrusion dies, in particular to a sealing rubber strip extrusion die.

Background

The sealing rubber strip plays an important role in water prevention, sealing and energy conservation in doors and windows, and has the functions of sound insulation, dust prevention, freeze prevention and heat preservation. It must have a high tensile strength, good elasticity and also a good temperature and ageing resistance.

Chinese patent No. CN208375951U discloses a compound opening sealing rubber strip extrusion die, which comprises a front die, a rear die and a die core unit, wherein the outer end surface of the front die is an extrusion end surface, the outer end surface of the rear die is an extrusion end surface, the inner end surface of the front die is tightly attached to the inner end surface of the rear die, the axial position of the front die is provided with a front die cavity corresponding to the cross-section outline of the sealing rubber strip, and the axial position of the rear die is provided with a rear die cavity communicated with the front die cavity; the mold unit comprises a mold core, a connecting piece and a fixing piece, wherein the mold core corresponds to the hollow part of the cross section of the sealing rubber strip; the inner end face of the rear die is also provided with an inward-recessed groove type secondary feeding channel communicated with the rear die cavity, an opening at one end of the secondary feeding channel is located at the edge of the inner end face of the rear die, the other end of the secondary feeding channel is communicated with the rear die cavity through a horn-shaped opening, and a plurality of material blocking blocks are arranged at the bottom of the horn-shaped opening.

However, in the actual assembly process, the mold core adopts a nested design, and if the position of the mold core deviates, the adjustment cannot be carried out, so that the flexibility is poor.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the sealing rubber strip extrusion die which has the effect of improving the flexibility of the die.

The above object of the present invention is achieved by the following technical solutions: a sealing rubber strip extrusion die comprises a feeding die and a forming die which are connected through a bolt, wherein a feeding cavity and a forming cavity are respectively arranged on the feeding die and the forming die, a die core with one end extending into the forming cavity is arranged in the feeding cavity, and an adjusting piece for adjusting the die core is arranged on the feeding die;

the regulating part is including adjusting frame and apron, it has a plurality of double-screw bolts to adjust frame female connection, the one end of double-screw bolt is equipped with the lug, the mold core terminal surface is equipped with the intermediate block that one end extends to in the adjusting frame, lug and intermediate block side one-to-one and both are inconsistent, the apron is connected with the adjusting frame through first countersunk screw, be equipped with a plurality of gag lever posts on the adjusting frame lateral wall, the heavy groove that supplies each gag lever post embedding is seted up to feeding mould lateral wall, each the gag lever post all is connected with the feeding mould through second countersunk screw.

Through adopting above-mentioned technical scheme, when needs adjustment mold core position, the operator twists earlier and moves the double-screw bolt and drive lug and middle piece separation, then removes the mold core and adjust, and the double-screw bolt is turned round again after the adjustment for each lug supports tightly with the middle piece, fixes the mold core, and is simple swift, has made things convenient for operator's actual assembly debugging work, has improved the flexibility of mould and the position precision of mold core, thereby has improved the shaping quality of product.

The present invention in a preferred example may be further configured to: the middle block is provided with a waist-shaped groove for placing the convex block, and the stud is provided with a hexagonal adjusting block.

By adopting the technical scheme, the possibility of relative displacement between the convex block and the middle block is reduced, and when an operator moves the middle block, the convex block and the waist-shaped groove play a role in guiding, so that the possibility of deflection of the mold core is reduced; the adjusting block facilitates the operator to rotate the stud by using a wrench.

The present invention in a preferred example may be further configured to: one side of the adjusting frame, which is far away from the cover plate, is connected with a sealing plate used for shielding the inside of the adjusting frame, and the mold core penetrates through the sealing plate.

Through adopting above-mentioned technical scheme, closing plate and apron are covered the adjusting collar is inside, have reduced the material and have got into in the adjusting collar, have made things convenient for the maintenance or the dismantlement of operator's later stage to the regulating part.

The present invention in a preferred example may be further configured to: the limiting rod is positioned in the feeding cavity, and the section of the limiting rod in the feeding cavity is elliptical.

Through adopting above-mentioned technical scheme, do benefit to the gag lever post and to the produced resistance when the material flows into the feeding intracavity.

The present invention in a preferred example may be further configured to: the feeding cavity is larger than the forming cavity in cross-sectional dimension, and a guide arc surface is arranged at one end, close to the feeding cavity, of the forming cavity.

By adopting the technical scheme, when the material enters the forming cavity from the feeding cavity, the pressure of the material is increased because the section size of the feeding cavity is larger than that of the forming cavity, and the forming compactness of the product is improved; the guide cambered surface reduces the obstruction of the material between the feeding cavity and the forming cavity.

The present invention in a preferred example may be further configured to: and a positioning block and a positioning groove are respectively arranged on one side of the feeding die and one side of the forming die, which are mutually butted.

Through adopting above-mentioned technical scheme, the grafting cooperation of locating piece and constant head tank is injectd the relative position of feeding mould and moulded die, has improved the position accuracy between feeding chamber and the shaping chamber.

The present invention in a preferred example may be further configured to: the adjusting frame is characterized in that a groove is formed in the inner wall of the adjusting frame, first compression springs are arranged on two sides of the stud, key blocks are connected to two ends of each first compression spring, the two key blocks are located in the groove and the waist-shaped groove respectively, a guide sleeve and a guide pillar are arranged on one opposite side of each of the two key blocks respectively, a scale mark is arranged on the guide pillar, and one end of the guide pillar is inserted into the guide sleeve.

By adopting the technical scheme, the elastic thrust action exerted by the first compression spring on the key block plays a role in reinforcing the middle block, and the connection of the middle block is stabilized; the scale lines provide an intuitive judgment for the operator to fine tune the middle block.

The present invention in a preferred example may be further configured to: the utility model discloses a feeding mould, including regulation frame, screw, slide groove, locating lever, guide ring, regulation frame, the spout that communicates with the screw is seted up on the regulation frame, it has the slider to peg graft in the spout, a plurality of through-holes of wearing out the feeding mould are seted up to feeding intracavity wall, it has the locating lever to peg graft in the through-hole, the one end and the slider of locating lever are connected, and the other end stretches out outside the through-hole, and the one end that stretches out is connected with the baffle of slope through second compression spring, be equipped with reference column and guide hole on baffle and the locating lever respectively, the.

By adopting the technical scheme, an operator rotates the driving ring, the guide plate drives the positioning rod to move along the through hole under the extrusion of the wedge block until the sliding block is abutted against the stud, the rotation of the driving ring is limited by the fixing piece at the moment, and the possibility of deviation of the mold core position caused by the looseness of the stud is reduced.

The present invention in a preferred example may be further configured to: the fixing piece comprises an electromagnet arranged on the feeding die and an iron ring connected to the driving ring.

By adopting the technical scheme, when the driving ring is fixed, the electromagnet is electrified to generate magnetism to attract the iron ring, so that the rotation of the driving ring is limited, and the driving ring is simple and convenient.

The present invention in a preferred example may be further configured to: the forming die is connected with a base plate through a fastening screw, two separating rollers are rotatably connected to the base plate, U-shaped fixing frames are arranged at two ends of the base plate, a carrier roller is arranged between the two fixing frames, two ends of the carrier roller are rotatably connected with core shafts, the core shafts penetrate out of the fixing frames, and one penetrating ends of the core shafts are in threaded connection with butterfly nuts; the core shaft is provided with a pin hole, a limiting pin is inserted in the pin hole, and the base plate is provided with a limiting hole for the limiting pin to be inserted in.

Through adopting above-mentioned technical scheme, extrude the back when the adhesive tape from the shaping chamber, the operator passes the adhesive tape from separating the roller and takes on the bearing roller, reduces the adhesive tape on the one hand and transversely beat, and on the other hand makes the adhesive tape keep with shaping chamber same height when exporting, has reduced the adhesive tape and has crooked and lead to the possibility of warping under the action of gravity.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the position of the die core is adjusted through the adjusting piece, so that the overall flexibility of the die is improved, and the position precision of the die core is guaranteed when an operator actually assembles the die, so that the extrusion quality of the rubber strip is improved;

2. the inner part of the adjusting frame is covered by the cover plate and the sealing plate, so that materials are prevented from entering the adjusting frame, convenience is provided for an operator to overhaul, install or replace the inner part of the adjusting frame, and the time for the operator to clean the materials is saved;

3. the driving ring is used for driving each positioning rod to move simultaneously, the sliding block is driven to be abutted against the stud, the reverse rotation of the stud is limited, and the stability of fixing the mold core is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present embodiment.

Fig. 2 is a schematic structural diagram for embodying the adjusting frame and the middle block in the present embodiment.

Fig. 3 is an enlarged view of a in fig. 2.

Fig. 4 is an enlarged view at B in fig. 2.

Fig. 5 is a schematic structural view of the present embodiment for embodying the cover plate and the sealing plate.

Fig. 6 is an enlarged view at C in fig. 5.

Fig. 7 is a schematic structural diagram for embodying the fixing member in this embodiment.

Fig. 8 is a schematic structural view for embodying the separator roller in the present embodiment.

Fig. 9 is a schematic structural diagram for embodying the stopper pin in this embodiment.

In the figure, 11, a feeding die; 111. a feed cavity; 12. forming a mould; 121. a molding cavity; 13. a mold core; 14. a bolt; 2. an adjustment member; 21. an adjusting frame; 22. a cover plate; 221. a first countersunk screw; 23. a stud; 231. a bump; 232. an adjusting block; 24. a middle block; 241. a waist-shaped groove; 25. a limiting rod; 251. a second countersunk screw; 26. sinking a groove; 27. a sealing plate; 28. a guiding cambered surface; 29. positioning blocks; 291. positioning a groove; 3. a groove; 31. a first compression spring; 32. a key block; 33. a guide sleeve; 34. a guide post; 341. scale lines; 4. a screw hole; 41. a chute; 42. a slider; 43. a through hole; 44. positioning a rod; 45. a second compression spring; 451. a guide plate; 46. a positioning column; 47. a guide hole; 48. a drive ring; 481. a guide wedge block; 5. a fixing member; 51. an electromagnet; 52. an iron ring; 6. a substrate; 61. fastening screws; 62. a separator roller; 63. a fixing frame; 64. a carrier roller; 641. a mandrel; 65. a butterfly nut; 66. a pin hole; 67. a spacing pin; 68. a limiting hole; .

Detailed Description

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

As shown in fig. 1, the sealing rubber strip extrusion die disclosed by the invention comprises a feeding die 11 and a forming die 12, wherein the feeding die 11 and the forming die 12 are connected through a bolt 14, a positioning block 29 and a positioning groove 291 are respectively arranged on one side of the feeding die 11 and the forming die 12, which are mutually abutted, the positioning block 29 is inserted into the positioning groove 291, the feeding die 11 and the forming die 12 are respectively provided with a feeding cavity 111 and a forming cavity 121, the cross-sectional profile of the feeding cavity 111 is the same as the outer profile of the rubber strip cross-section, the cross-sectional area of a discharging cavity is larger than that of the feeding cavity 111, and a guide arc surface 28 is arranged at one end of the forming cavity 121 close to the feeding cavity 111, so that the.

As shown in fig. 1, a mold core 13 is arranged in the feeding cavity 111, the cross section of the mold core 13 is the same as that of the hollow part of the rubber strip, one end of the mold core 13 extends into the molding cavity 121, the extended end is flush with one side of the molding die 12 departing from the feeding die 11, and the feeding die 11 is provided with an adjusting part 2 for adjusting the mold core 13.

As shown in fig. 2 and 3, the adjusting member 2 includes an adjusting frame 21 and a cover plate 22, each surface of the inner wall of the adjusting frame 21 is connected with a stud 23 by a thread, one end of the stud 23 located in the adjusting frame 21 is provided with a circular convex block 231 and a hexagonal adjusting block 232, the end surface of the mold core 13 is provided with a middle block 24, one end of the middle block extends into the adjusting frame 21, each side surface of the outer wall of the middle block 24 is provided with a waist-shaped groove 241 extending along the length direction of the side surface, the waist-shaped grooves 241 are in one-to-one correspondence with the convex blocks 231, the groove width of each waist-shaped groove 241 is the same as the outer diameter of the convex block 231, the convex blocks 231 are embedded into the waist-shaped grooves 241 and abut against the groove bottom, so that the.

As shown in fig. 1, the side wall of the adjusting frame 21 is provided with a plurality of limiting rods 25, the end surface of the feeding mold 11 is provided with a sunk groove 26 corresponding to each limiting rod 25, the limiting rods 25 are embedded into the sunk grooves 26, and the limiting rods 25 are connected with the feeding mold 11 through second sunk screws 251, so that the mold core 13 is fixed, and the cross section of one section of the limiting rod 25 located in the feeding cavity 111 is oval.

As shown in fig. 5 and 6, the two sides of the stud 23 are both provided with first compression springs 31 distributed in parallel, two ends of each first compression spring 31 are connected with a key block 32 (as shown in fig. 3), the inner wall of the adjusting frame 21 is provided with a groove 3 corresponding to the key block 32, the two opposite key blocks 32 are respectively inserted into the groove 3 and the kidney-shaped groove 241, the first compression springs 31 are in a compressed state, so that the middle block 24 is further fixed under the elastic thrust of each key block 32, the two opposite key blocks 32 are further provided with a guide sleeve 33 and a guide pillar 34 on the opposite sides, the guide pillar 34 is provided with a scale mark 341, and one end of the guide pillar 34 is inserted into the guide sleeve 33.

As shown in fig. 5, the cover plate 22 is connected with the adjusting frame 21 through a first countersunk screw 221, a sealing plate 27 is screwed on one side of the adjusting frame 21 away from the cover plate 22 through a screw, the mold core 13 penetrates through the sealing plate 27, and the sealing plate 27 and the cover plate 22 shield the inside of the adjusting frame 21 to reduce the material entering the adjusting frame 21.

When the position of the mold core 13 needs to be adjusted, an operator unscrews the first countersunk head screw 221, removes the cover plate 22, selects the stud 23 in the corresponding direction according to the eccentric position of the mold core 13, then screws the adjusting block 232 by using a wrench to drive the stud 23 to rotate, controls the screwing-in or screwing-out distance of the stud 23 through the scale mark 341, moves the middle block 24 after the protrusion 231 is separated from the bottom of the kidney-shaped groove 241, reversely screws the adjusting block 232 after the middle block 24 is in place, so that the protrusion 231 is abutted against the bottom of the kidney-shaped groove 241, fixes the middle block 24, does not need to completely disassemble the mold, is convenient and quick, ensures the position precision of the mold core 13, is beneficial to improving the molding quality of products, and improves the flexibility of the whole mold.

As shown in fig. 2 and 3, each outer side surface of the adjusting frame 21 is provided with a screw hole 4 and a sliding groove 41, the screw hole 4 is communicated with the inside of the adjusting frame 21 and is matched with the stud 23, the sliding grooves 41 extend along the length direction corresponding to the side surface of the adjusting frame 21, the groove width of the sliding groove 41 is smaller than the diameter of the screw hole 4, the groove depth of the sliding groove 41 is smaller than the thickness of the adjusting frame 21, a sliding block 42 is inserted in the sliding groove 41, and the sliding block 42 is abutted against the stud 23.

As shown in fig. 4, the inner wall of the feeding cavity 111 is provided with a plurality of through holes 43 penetrating out of the feeding die 11 along the radial direction, positioning rods 44 are inserted into the through holes 43, one ends of the positioning rods 44 are connected with the sliding blocks 42, the other ends of the positioning rods extend out of the through holes 43, the extending ends of the positioning rods are connected with inclined guide plates 451 through second compression springs 45, the guide plates 451 are circumferentially arranged along the axis of the feeding die 11, one sides of the guide plates 451 opposite to the positioning rods 44 are respectively provided with positioning columns 46 and guide holes 47, and the positioning columns 46 are in inserted fit with; a driving ring 48 is rotatably connected to the outside of the feeding mold 11, a guide wedge 481 abutting against each guide plate 451 is provided on the inner wall of the driving ring 48, and a fixing member 5 for fixing the driving ring 48 is provided on the feeding mold 11.

As shown in fig. 7, the fixing member 5 includes an electromagnet 51 disposed on the feeding mold 11 and an iron ring 52 connected to the side wall of the driving ring 48, the electromagnet 51 is energized to generate a magnetic force to attract the iron ring 52, and the rotation of the driving ring 48 is limited, the electromagnet 51 is de-energized and de-energized, and the driving ring 48 can rotate freely.

An operator rotates the driving ring 48 to drive the guide wedges 481 to extrude the guide plates 451, each guide plate 451 enables the second compression spring 45 to push the positioning rod 44 to move along the through hole 43 under the thrust of the guide wedges 481, the sliding block 42 is driven to be tightly abutted against the stud 23 to limit the reverse rotation of the stud 23, and then the electromagnet 51 is electrified to fix the driving ring 48; when the position of the middle block 24 is adjusted, the length of each stud 23 in the screw hole 4 is different, after the first sliding block 42 is abutted against the stud 23, an operator continues to rotate the driving ring 48, the position of the first sliding block 42 is unchanged, the corresponding second compression spring 45 is compressed, the rest positioning rods 44 advance, all the sliding blocks 42 are guaranteed to be abutted against the studs 23, and the thrust of each sliding block 42 also plays a role in stabilizing the middle block 24 and limits the swing of the middle block 24.

As shown in fig. 8 and 9, the forming die 12 is connected to the base plate 6 through a fastening screw 61, the base plate 6 is located on one side of the forming die 12 away from the feeding die 11, the base plate 6 is horizontally distributed, and the length direction of the base plate is perpendicular to the axis of the forming die 12, the base plate 6 is provided with two separating rollers 62 and two carrier rollers 64 which are sequentially arranged along the discharging direction of the forming die 12, the separating rollers 62 are rotatably connected to the base plate 6 and are distributed along the length direction of the base plate 6, the two separating rollers 62 are both perpendicular to the base plate 6, both ends of the base plate 6 are provided with U-shaped fixing frames 63, the openings of the fixing frames 63 are upward, the carrier rollers 64 are located between the two fixing frames 63, both ends of the carrier rollers 64 are rotatably connected with mandrels; the mandrel 641 is provided with a pin hole 66, a limit pin 67 is inserted into the pin hole 66, the base plate 6 is provided with a limit hole 68 corresponding to the pin hole 66, the limit pin 67 is inserted into the limit hole 68 to limit the rotation of the mandrel 641, an operator moves the carrier roller 64 to adjust the relative height between the carrier roller 64 and the forming cavity 121, and after the adjustment is finished, the two butterfly nuts 65 are screwed to be tightly abutted against the fixing frame 63, so that the carrier roller 64 can be fixed.

During processing, an operator fixes the forming die 12 on a die head of an extruder, materials are input into the feeding cavity 111 from the space between the limiting rods 25, then enter the forming cavity 121 from the feeding cavity 111, and finally are extruded into rubber strips, the rubber strips pass through the two separating rollers 62 and then are put on the carrier roller 64 by the operator, so that the rubber strips are kept at the same height with the forming cavity 121, the deformation of the rubber strips caused by downward bending is reduced, and the quality of the rubber strips is guaranteed.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a joint strip extrusion tooling which characterized in that: the device comprises a feeding die (11) and a forming die (12) which are connected through a bolt (14), wherein the feeding die (11) and the forming die (12) are respectively provided with a feeding cavity (111) and a forming cavity (121), a die core (13) with one end extending into the forming cavity (121) is arranged in the feeding cavity (111), and an adjusting part (2) for adjusting the die core (13) is arranged on the feeding die (11);

adjusting part (2) are including adjusting frame (21) and apron (22), it has a plurality of double-screw bolts (23) to adjust frame (21) internal thread connection, the one end of double-screw bolt (23) is equipped with lug (231), mold core (13) terminal surface is equipped with middle piece (24) that one end extends to in adjusting frame (21), lug (231) and middle piece (24) side one-to-one and both counterbalance, apron (22) are connected with adjusting frame (21) through first countersunk screw (221), be equipped with a plurality of gag lever posts (25) on adjusting frame (21) lateral wall, heavy groove (26) that supply each gag lever post (25) embedding are seted up to feeding mould (11) lateral wall, each gag lever post (25) all are connected with feeding mould (11) through second countersunk screw (251).

2. The joint strip extrusion die of claim 1, wherein: the middle block (24) is provided with a waist-shaped groove (241) for placing the convex block (231), and the stud (23) is provided with a hexagonal adjusting block (232).

3. The joint strip extrusion die of claim 1, wherein: one side of the adjusting frame (21) departing from the cover plate (22) is connected with a sealing plate (27) used for shielding the inside of the adjusting frame (21), and the mold core (13) penetrates through the sealing plate (27).

4. A joint strip extrusion die according to claim 1 or 3, wherein: the section of the limiting rod (25) in the feeding cavity (111) is oval in cross section.

5. The joint strip extrusion die of claim 4, wherein: the cross-sectional dimension of the feeding cavity (111) is larger than that of the forming cavity (121), and a guide arc surface (28) is arranged at one end, close to the feeding cavity (111), of the forming cavity (121).

6. The joint strip extrusion die of claim 5, wherein: and a positioning block (29) and a positioning groove (291) are respectively arranged on one side of the feeding die (11) and one side of the forming die (12) which are mutually abutted.

7. The joint strip extrusion die of claim 2, wherein: the inner wall of the adjusting frame (21) is provided with a groove (3), two sides of the stud (23) are respectively provided with a first compression spring (31), two ends of the first compression spring (31) are respectively connected with a key block (32), the two key blocks (32) are respectively positioned in the groove (3) and the waist-shaped groove (241), the two key blocks (32) are respectively provided with a guide sleeve (33) and a guide pillar (34) on one opposite side, and one end of the guide pillar (34) provided with a scale mark (341) is inserted into the guide sleeve (33).

8. The joint strip extrusion die of claim 1, wherein: the adjusting frame (21) is provided with screw holes (4) matched with the studs (23), the side edge of the adjusting frame (21) is provided with a sliding groove (41) communicated with the screw holes (4), a sliding block (42) is inserted in the sliding groove (41), the inner wall of the feeding cavity (111) is provided with a plurality of through holes (43) penetrating through the feeding die (11), a positioning rod (44) is inserted in the through hole (43), one end of the positioning rod (44) is connected with the sliding block (42), the other end of the positioning rod extends out of the through hole (43), the extending end of the positioning rod is connected with an inclined guide plate (451) through a second compression spring (45), the guide plate (451) and the positioning rod (44) are respectively provided with a positioning column (46) and a guide hole (47), one end of the positioning column (46) is inserted into the guide hole (47), the outer side of the feeding die (11) is rotatably connected with a driving ring (48), the inner wall of the driving ring (, and the feeding die (11) is provided with a fixing piece (5) for fixing the driving ring (48).

9. The joint strip extrusion die of claim 8, wherein: the fixing piece (5) comprises an electromagnet (51) arranged on the feeding die (11) and an iron ring (52) connected to the driving ring (48).

10. The joint strip extrusion die of claim 1, wherein: the forming die (12) is connected with a base plate (6) through a fastening screw (61), the base plate (6) is rotatably connected with two separating rollers (62), two ends of the base plate (6) are respectively provided with a U-shaped fixing frame (63), a carrier roller (64) is arranged between the two fixing frames (63), two ends of the carrier roller (64) are respectively rotatably connected with a core shaft (641), the core shaft (641) penetrates out of the fixing frames (63), and one penetrating end of the core shaft is in threaded connection with a butterfly nut (65); the core shaft (641) is provided with a pin hole (66), a limit pin (67) is inserted in the pin hole (66), and the base plate (6) is provided with a limit hole (68) for the limit pin (67) to be inserted into.