JP2978927B1 - Strand cutting equipment - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To easily and safely perform a gap adjusting operation between a blade edge of a fixed blade body and a blade edge of each blade plate in a rotary blade body. SOLUTION: A fixed blade body 2 having a cutting edge orthogonal to a traveling direction of a strand, and a front surface 3a fixed to a tip of a rotary shaft 13 orthogonal to a cutting edge of the fixed blade body 2 and having a front surface 3a.
The rotary blade 13 is provided with a plurality of blade plates 15 radially disposed thereon, and the rotating shaft 13 rotates via a bearing mechanism 30 on a support member 14 opposed to one side of the fixed blade 2 at an interval. It is freely supported. The support member 14 is guided by a pair of guide plates 39 so as to be linearly movable in the same direction as the axial direction of the rotary shaft 13, and linearly moves the rotary blade body 3 together with the support member 14 in the same direction to form a fixed blade body. 2 cutting edge 2
After adjusting the gap between a and the blade edge 15 a of the blade plate 15, the blade can be fixed with the fixing bolt 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strand cutting device used for a plastic pellet manufacturing device.

[0002]

2. Description of the Related Art An example of a conventional strand cutting apparatus used in a pellet manufacturing apparatus will be described.

FIG. 7 is an explanatory diagram showing an overall outline of a strand cutting type pellet manufacturing apparatus according to a conventional example. This pellet manufacturing apparatus plasticizes plastic by an extruder 101, extrudes a strand 103 by an extrusion die 102, cools and solidifies the extruded strand 103 through a cooling water tank 104, and then cuts the strand through a guide roll 108. It is configured to be introduced into the device 105 and to be sequentially cut into pellets.

The strand cutting device 105 includes a take-up roll 106 composed of a pair of upper and lower rolls for drawing in the strand 103 and sending it out onto the fixed blade body 112, and a fixed blade body having a cutting edge orthogonal to the traveling direction of the strand 103. 112, a disk-shaped rotary cutter 110 for sequentially cutting the strands 103 sent out onto the fixed blade body 112, a motor 109 for rotating a rotary shaft 111 of the rotary cutter 110, and the like.

[0005] As shown in FIGS. 8 and 9, the rotary shaft 111 of the rotary cutter 110 is supported at right angles to the cutting edge of the fixed blade 112 and biased to one side of the fixed blade 112. The fixed blade 11 of the rotary cutter 110
A plurality of blade plates 113 are radially provided on the front surface facing the second blade edge.
Are arranged.

The blade plate 113 is inserted into a blade plate guide groove 117 provided on the front surface of the rotary cutter 110, and has a push-pull bolt 115 screwed into a screw hole provided on the rear surface side of the rotary cutter 110. After the amount of protrusion of the blade edge is adjusted by rotating the cutter forward and backward, the fastening bolt 116 is tightened to be fixed to the rotary cutter 110.

[0007]

In the above prior art,
When adjusting the amount of protrusion of the blade edge of each blade from the front surface of the rotary cutter, a gap gauge is used so that a predetermined gap is formed between the blade edge of the fixed blade body and the blade edge of each blade plate in the rotary cutter. The length (gap) of the gap between the blade edge of the fixed blade body and the blade edge of the blade plate was manually measured for each blade plate.
The adjustment work is complicated and requires a high degree of skill, and there is a safety problem that the fingers may be injured.

In addition, the rotary shaft of the rotary cutter and the like undergo elongation due to thermal expansion, and the length of the gap between the blade edge of the fixed blade body and the blade edge of each blade plate disposed on the rotary cutter is thermally expanded. If the length of elongation is not set longer than the amount of elongation caused by the above, there is a problem that a failure such as a breakage of the cutting edge due to interference between both cutting edges occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and simplifies the operation of adjusting the gap between the blade edge of the fixed blade body and the blade edge of each blade plate of the rotary blade body. Another object of the present invention is to realize a strand cutting device that can be safely performed.

It is another object of the present invention to provide a strand cutting device capable of avoiding occurrence of an accident such as breakage of the blade edge caused by interference between the blade edge of the fixed blade body and the blade edge of each blade plate of the rotary blade body. Is what you do.

[0011]

In order to achieve the above object, a strand cutting device according to the present invention comprises a fixed blade having a cutting edge perpendicular to a traveling direction of a strand, and a fixed blade having a cutting edge perpendicular to a traveling direction of the strand. A support member opposed at a distance, a rotation shaft orthogonal to the cutting edge of the fixed blade body rotatably supported by the support member via a bearing mechanism, and integrally formed at the tip of the rotation shaft. The provided disk-shaped rotary blade body, a plurality of guide grooves radially provided on the front surface of the rotary blade body facing the blade edge of the fixed blade body, and the protrusion amount of the blade edge changes in each of the guide grooves. In a strand cutting device provided with a freely disposed blade plate, the support member is guided by guide means so as to be linearly movable in the same direction as the axial direction of the rotating shaft, and the rotating shaft is supported together with the supporting member. At the tip of It is configured such that the physically provided rotary blade body is linearly moved in the same direction as the axial direction of the rotating shaft, so that a gap between the blade edge of the fixed blade body and the blade edge of the blade plate can be adjusted. It is characterized by having.

Further, the bearing mechanism is movable with respect to the support member in the axial direction by a predetermined distance integrally with the rotating shaft, and is constantly urged toward the fixed blade by the elastic member. be able to.

Further, it is effective that the fixed blade has a cutting edge protruding toward the rotary blade, and a slope on the inner diameter side of the cutting edge is chamfered.

In addition, the plurality of blade plates are configured such that the inner diameter side of the blade edge of each blade plate first intersects with the blade edge of the fixed blade body with the rotation of the rotary blade body, and the two blade edges at the time of the first crossing. Angle is 5 °
It may be arranged to be within the range of up to 15 °.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a strand cutting device according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic front view showing an upper case opened, FIG. 2 is a schematic partial sectional view showing a main part of the strand cutting device shown in FIG. 1 in an axial section, and FIG. It is a schematic top view of the part shown.

The strand cutting device according to the present embodiment includes a take-up roll composed of a pair of upper and lower rolls 18 and 19 for drawing in a strand (not shown) and sending it out onto the fixed blade body 2. Fixed blade body 2 having a cutting edge 2a orthogonal to the support member, a support member 14 opposed to one side of the fixed blade body 2 at an interval, and a fixed rotatably supported by the support member 14 via a bearing mechanism 30. A rotating shaft 13 orthogonal to the cutting edge 2a of the blade body 2,
The fixed blade 2 fixed to the tip of the rotating shaft 13
Rotating blade body 3 having a plurality of blade plates 15 radially arranged on a front surface 3a opposed to blade edge 2a, fixed blade body 2 and rotating blade body 3
And a cover 6 (see FIG. 6) for capturing the pellets sequentially cut and discharging the pellets to the outside of the machine.

The front face 3a of the rotary blade 3 has a plurality of guide grooves 3 for guiding the cut pellets radially outward.
d is formed radially from the vicinity of the blade edge 15a of each blade plate 15.

The rotary blade 3 has a front surface 3a and an outer peripheral surface 3a.
b, a plurality of blade plate guide grooves 17 opening radially are provided, and in each guide groove 17, a blade plate 15 is provided with a blade edge 15 thereof.
a is protruded from the front surface 3a.

Each blade plate guide groove 17 is inclined from the front surface 3a of the rotary blade body 3 toward the rear surface 3c with respect to the rotation axis at a predetermined inclination angle of the rotation axis. With the rotation of the rotary blade 3, the blade edge 15a of the blade plate 15
Of the fixed blade body 2 first intersects the cutting edge 2a of the fixed blade body 2, and the angle between the cutting edges 15a and 2a at that time (hereinafter, referred to as "penetration angle θ") is arranged to be a predetermined value. I have. That is, it is inclined in the anti-rotation direction with respect to the radiation of the rotary blade body 3 (see FIG. 4). On the other hand, the blade plate 15 rotates the push / pull bolt 16 screwed into a pair of screw holes 16a (see FIG. 3) penetrating from the rear surface 3c of the rotary blade body 3 to the bottom wall of the blade plate guide groove 17 in the forward and reverse directions. By doing so, the protrusion amount of the blade plate 15 from the front surface 3a can be changed within the range of the length of the slit 15b, and the fastening bolt screwed into the fastening plate 23 through the slit 15b from the rear surface 3c side. 20 is configured to be fixed by tightening.

In the present invention, the two cutting edges 15a,
If the penetration angle θ between the blades 2a is set within the range of 5 ° to 15 °, a plurality of strands arranged in a row on the blade edge 2a of the fixed blade body 2 are arranged radially inside the blade edge 15a of the blade plate 15. The pieces are sequentially cut one by one, and the strands are cut at substantially right angles without bending at the time of cutting. As a result, the load applied to the blade plate 15 of the rotary blade body 3 is reduced, and the generated noise is also reduced.

When the penetration angle θ is smaller than 5 °, a plurality of strands arranged in a row on the cutting edge 2a of the fixed blade 2 are cut simultaneously by the cutting edge 15a of the blade plate 15 of the rotary blade 3. , The generated noise increases. Conversely, when the penetration angle θ is larger than 15 °, the strands arranged in a line on the cutting edge 2a of the fixed blade 2
Before being cut by the cutting edge 15a of No. 5, it bends largely displaced radially outward, the strand is not cut at a right angle, and the shape of the pellet becomes rhombic.

The rotary shaft 13 is rotatably mounted on a support member 14 in which a portion near the rotary blade body 3 on the tip side can be adjusted on the upper wall 1a of the housing 1 in the same direction as the rotary shaft 13 in the axial direction. It is supported and is forcibly rotated by a rotation driving means (not shown) which is provided on the rear end side and which can move in a known axial direction.

The support member 14 has a flange portion 40 protruding to both sides below both side surfaces, and a pair of flange portions 40 arranged on the upper wall 1 a of the housing 1 in parallel with the rotating shaft 13. It is slidably fitted between the guide plates 39,
The adjusting bolt 37 rotatably disposed on a supporting portion 38 provided integrally with the upper wall 1a is rotated forward and backward, guided by a pair of guide plates 39, and is in the same direction as the axial direction of the rotating shaft 13. After moving to the predetermined position,
A fixing bolt 41 inserted into a through-hole 0 (not shown) can be fixed by tightening. That is, the support member 14 is guided by the pair of guide plates 39 as guide means so as to be linearly movable in the same direction as the rotation shaft 13, and is provided integrally with the support member 14 at the tip of the rotation shaft 13. The rotating blade body 3 can be linearly moved in the same direction as the axial direction of the rotating shaft 13 and fixed at a predetermined position.

The rotating shaft 13 is supported by a support member 14 via a combined angular ball bearing 30. In the combination angular ball bearing 30, a pair of inner races 31 are fixed to the rotating shaft 13, and a pair of outer races 32 are slidably fitted in the bearing holes 14a of the support member 14 in the axial direction. A collar member 34 is slidably fitted in the axial direction adjacent to the rear outer race 32, and a compression spring 36, which is an elastic member, is interposed between the collar member 34 and the lid 35. It is constantly urged toward the fixed blade (in the direction of the white arrow) so that a gap H is formed between the member 34 and the tip of the lid 35.

The length of the gap H is preferably set to a length corresponding to at least the amount of extension of the rotary blade 3 and the rotary shaft 13 caused by thermal expansion. The resilient force of the compression spring 36 is such that the rotating shaft 13 does not retreat inadvertently when cutting the pellet, and the cutting edge 2a of the fixed blade body 2 and the cutting edge 15a of each blade plate 15 are cut.
It is preferable to set the size so that the rotating shaft 13 is retracted when an unexpectedly large load is applied such that the shaft is damaged.

The cover 6 has a lower case 4 having a substantially funnel-like shape having an opening on the upper surface, and an upper case 5 disposed to be openable and closable via the hinge 7 with respect to the opening of the lower case 4. It is composed of

The lower case 4 has a bottom wall 4a inclined toward a lower portion of one of the side walls 1b of the housing 1 and a substantially vertical surface facing the bottom wall 4a, following the arc-shaped portion near the opening on the upper surface. By providing a side wall 4b and communicating the lower end of the bottom wall 4a to a discharge port 4c opened to the outside of the housing 1, the cut pellets can be discharged to the outside of the housing 1.

The upper case 5 has a semi-cylindrical shape that covers the upper half of the rotary blade body 3, and has a hinge portion 7 on the side opposite to the fixed blade body (right side in the figure). A substantially intermediate portion of the protruding rotary arm 7a is pivotally connected to a protruding member 7c provided on the upper wall 1a of the housing 1 via a pivot 7b. The distal end of the rotating arm 7a is connected via a pin 8 to the distal end of a rod 9a of a hydraulic cylinder 9 fixed to one side wall 1b of the housing 1, and the hydraulic cylinder 9 is activated. When the rod 9a is expanded and contracted, the rod 9a can be pivoted about the pivot 7b and can be opened and closed with respect to the opening of the lower case 4. On the other hand, a rotating handle type clamp 1 is provided on the outer surface of the upper case 5 on the fixed blade side (left side in the figure).
2 are provided, and when the upper case 5 is closed, the hook 12a of the clamp 12 is engaged with the engaging portion 4d provided on the lower case 4 so as not to be opened carelessly.

Further, the upper case 5 of the semi-cylindrical, as shown in FIG. 5, the rotation axis O ₂ of the center O ₁ is rotary blade body 3
Are arranged eccentric to the fixed blade side with respect to
The distance between the imaginary outer peripheral circle drawn by the radial end of the blade plate 5 of the rotary blade body 3 when closed with respect to the lower case 4 and the inner peripheral surface of the upper case 5 is determined by the rotation direction of the rotary blade body 3. It is configured to gradually increase in the same direction and become maximum near the side of the fixed blade body 2. Thereby, with the rotation of the rotary blade body 3, an airflow in the direction of the arrow is generated, and the cut pellets are directed toward the lower case 4, and the lower case 4 is inclined without the pellets being deposited. It flows down along the bottom wall 4a and is discharged out of the machine from the discharge port 4c.

It is needless to say that the present invention is not limited to the power type in which the upper case 5 is rotated by the fluid pressure cylinder 9 shown in the present embodiment, and that the upper case 5 can be manually rotated. .

The lower roll 19 in the take-up roll
Is rotatably disposed in a recess 11 a provided on the upper surface of the pedestal 11.
The belt 9 is forcibly rotated by wrapping a belt between a pulley 19b integrally provided at a tip end of the drive motor 9a and a pulley of an output shaft of a drive motor (not shown). On the other hand, the upper roll 18 is rotatably supported by lower ends of rods (not shown) of a pair of fluid pressure cylinders 24 fixed to the upper case 5.

Since the take-up roll is configured as described above, when the upper case 5 is closed with respect to the lower case 4, the pair of fluid pressure cylinders 24 is activated to extend and contract the rod, so that the upper roll 5 18 with respect to the lower roll 19, and the upper roll 1
The strand can be pulled out and stably sent out onto the fixed blade 2 while a predetermined pressing force is applied between the roll 8 and the lower roll 19.

When the upper case 5 is closed with respect to the lower case 4, the roll cover 10 provided integrally with the upper case 5 can be used not only for the upper roll 18 but also for the pedestal 11.
Has a substantially eaves-like shape that can be covered so as not to be exposed, and a cutout portion 21 serving as a strand introduction port is provided at a lower end portion of the front wall 10a.

In the present embodiment, the operation of adjusting the length of the gap (separation distance) between the blade edge 2a of the fixed blade body 2 and the blade edge 15a of the blade plate 15 of the rotary blade body 3 will be described below. It can be performed quickly and safely by a simple method.

Loosen the fixing bolt 41 and support member 1
4 is guided by a pair of guide plates 39 so as to be movable, and the adjusting bolt 37 is rotated forward or backward to move the rotary shaft 13 together with the support member 14 in the axial direction, so that the cutting edge 2a of the fixed blade body 2 is moved. And the front surface 3a of the rotary blade 3 is positioned at a position where a predetermined initial separation distance is provided, and the fixing bolt 41 is tightened and fixed.

In this step, it is important that the initial separation distance be longer than the elongation of the rotary shaft, the rotary blade, and the like caused by the thermal expansion described above.

After the above, one blade plate 15 in the rotary blade body 3 is selected, the fastening bolt 20 is loosened, and the push-pull bolt 16 is rotated to set the blade tip 15 a on the inner diameter side of the blade plate 15 to the fixed blade body 2. Then, while rotating the rotary blade body 3, the push / pull bolt 16 is rotated to rotate the blade edge 15 a of the outer diameter side of the blade plate 15 to the blade edge 2 of the fixed blade body 2.
After that, the blade plate 15 is fixed to the rotary blade body 3 by tightening the fastening bolt 20.

After the above, with respect to the remaining blade plates 15 of the rotary blade body 3, the same operation as in the above-described process is sequentially performed by manually rotating the rotary blade body 3, and the cutting edges 1 of all the blade plates 15 are obtained.
5 a is brought into contact with the cutting edge 2 a of the fixed blade body 2.

After the above, the dial gauge 22 is set on the fixed blade body 2 side so that the distance in the axial direction can be measured.
Are moved by being guided by a pair of guide plates 39, and the adjusting bolt 37 is rotated to support the supporting member 1.
4, the distance between the cutting edge 2a of the fixed blade 2 and the front surface 3a of the rotary blade 3 measured by the dial gauge 22 when the rotary shaft 13 is separated from the fixed blade 2 becomes a predetermined set value. It is positioned at the position and the fixing bolt 41 is tightened and fixed.

In this step, the support member 14 is guided between the pair of guide plates 39 and
In order to move in the axial direction of the rotating shaft 3 perpendicular to the fixed blade 2, the distance between the cutting edge 2 a of the fixed blade 2 and the front surface 3 a of the rotating blade 3 is measured by the dial gauge 22, so that the fixed blade 2 is moved. The length of the gap between the blade edge 2a of the rotary blade 3 and the blade edge 15a of the blade plate 15 of the rotary blade body 3 can be set to a predetermined value with high accuracy.

Next, another embodiment of the strand cutting device according to the present invention will be described.

In the strand cutting apparatus according to the present embodiment, as shown in FIG. 6, a fixed blade body 52 is provided with a blade edge 52a protruding toward the rotary blade body 3, and is provided at an inner diameter side end of the blade edge 52a. The inclined surface 52b having the chamfer angle α is chamfered. The fixed blade body 52 and the blade plate 15 of the rotary blade body 3 are made of a material having excellent wear resistance, such as a cemented carbide.

Note that the other parts may be the same as those of the strand cutting apparatus according to the above-described embodiment, and a description thereof will not be repeated.

According to the present embodiment, as shown in FIG. 6, the cutting edge 52a of the fixed blade 52 is attached to the cutting edge 52a of the fixed blade 52 due to the expansion of the rotating shaft 13 and the rotating blade 3 due to thermal expansion.
a is overlapped by the overlap length δ, when the inner diameter of the cutting edge 15a of the blade plate 15 abuts, the rotary shaft 13 (Refer to FIG. 2), the shaft retreats by a distance corresponding to the overlap length δ by digging in the resilient force in the direction of the outlined arrow of FIG.
Are automatically prevented from interfering with each other. As a result, the strand can be cut in a state in which the cutting edges 15a, 52a having no gap between the cutting edge 52a of the fixed blade body 52 and the cutting edge 15a of the blade plate 15 of the rotary blade body 3 are always in contact with each other. It can be used for cutting strands made of quality plastic.

[0046]

Since the present invention is configured as described above, the following effects can be obtained.

The operation of adjusting the gap between the blade edge of the fixed blade body and the blade edge of each blade plate of the rotary blade body can be performed easily and safely.

According to the second aspect of the present invention, since the cutting can be performed in a state where the blade edge of the fixed blade body and the blade edge of the blade plate of the rotary blade body are in contact with each other, the strand is made of soft rubbery plastic. Can also be cut into good quality pellets.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a strand cutting device according to an embodiment with a cover opened.

FIG. 2 is a schematic partial cross-sectional view showing a main part of the strand cutting device shown in FIG. 1 in a cross section along an axial direction.

FIG. 3 is a schematic top view of a portion shown in FIG. 2;

FIG. 4 is an explanatory diagram showing a relationship between a blade edge of a fixed blade body and a blade edge of a blade plate of a rotary blade body.

FIG. 5 is an explanatory diagram showing a positional relationship between a rotary blade body and a cover in the strand cutting device shown in FIG.

FIG. 6 is an explanatory diagram showing a relationship between a blade edge of a fixed blade body and a blade edge of a blade plate of a rotary blade body in a strand cutting device according to another embodiment.

FIG. 7 is an explanatory diagram showing an overall outline of a strand cutting device according to a conventional example.

8 is a schematic partial cross-sectional view showing a main part of the strand cutting device shown in FIG. 7 in a cross section along the axial direction.

FIG. 9 is a schematic front view of a rotary blade body in the strand cutting device shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 housing 1a upper wall 2,52 fixed blade 2a, 15a, 52a blade 3 rotating blade 3a front 3b outer peripheral surface 3c rear 3d guide groove 4 lower case 5 upper case 6 cover 7 hinge 7a rotating arm 7b pivot 7c Projecting member 8 Pin 9, 24 Fluid pressure cylinder 10 Roll cover 11 Pedestal 11a Concave part 12 Clamp 13 Rotating shaft 13a Hollow part 13b Cooling water hole 14 Support member 15 Blade plate 16 Push-pull bolt 17 Blade plate guide groove 18 Upper roll 19 Lower Roll 20 fastening bolt 21 notch 22 dial gauge 23 fastening plate 30 combined angular ball bearing 31 inner race 32 outer race 34 collar member 35 lid 36 compression spring 37 adjustment bolt 38 support 39 guide plate 40 flange 41 stop bolt

Continuation of the front page (56) References JP-A-8-142049 (JP, A) JP-A-5-277995 (JP, A) JP-A-1-225511 (JP, A) Japanese Utility Model Laid-Open No. 59-146112 (JP) , U) Jikken 49-32378 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29B 9/00-9/16 B26D 1/00-1/62

Claims (4)

(57) [Claims] 1. A fixed blade body (2, 52) having a blade edge (2a, 52a) orthogonal to a traveling direction of a strand.
A support member (14) opposed to one side of the fixed blade at an interval, and a bearing mechanism (30) provided on the support member.
A rotating shaft (13) orthogonal to a cutting edge of the fixed blade body rotatably supported via a shaft, and a disk-shaped rotating blade body (3) integrally provided at a tip of the rotating shaft. A front surface (3) of the rotary blade body facing the cutting edge of the fixed blade body;
a) a plurality of guide grooves (17) provided radially;
In a strand cutting device provided with a blade plate (15) in which a protruding amount of a blade edge (15a) can be freely changed in each of the guide grooves, the support member is arranged in an axial direction of the rotating shaft by a guide means (39). The rotary blade body provided integrally with the tip of the rotary shaft together with the support member is linearly moved in the same direction as the axial direction of the rotary shaft. A strand cutting device characterized in that a gap between a blade edge of a fixed blade body and a blade edge of the blade plate can be adjusted. The bearing mechanism is movable with respect to the support member in the axial direction by a predetermined distance integrally with the rotary shaft, and is constantly urged toward the fixed blade by an elastic member. The strand cutting device according to claim 1, wherein 3. The strand cutting apparatus according to claim 2, wherein the fixed blade body has a cutting edge protruding toward the rotary blade body, and an inclined surface is chamfered on an inner diameter side of the cutting edge. apparatus. 4. A plurality of blade plates, wherein the inner diameter side of the blade edge of each blade plate first intersects with the blade edge of the fixed blade body with the rotation of the rotary blade body, and the angle of the two blade edges when the first crossing occurs. Is between 5 ° and 15
The strand cutting device according to any one of claims 1 to 3, wherein the strand cutting device is disposed so as to be within an angle range.