Rubber scraper and rubber scraping method

Abstract

To prevent a rubber material stripped from a roll from sticking and staying on a tabular scraper.SOLUTION: A method of stripping a rubber material includes: a strip process of stripping a rubber material 201 from a surface of a rotating roll 12b by bringing a blade 132 of a tabular scraper 131 into contact with a surface of the roll 12b of one of a roll 12a and the roll 12b provided by an open roll type kneading machine 11; a separation process of separating the rubber material 201 from the surface of the scraper 131 by placing a roller 151 rotating around an axis parallel to a supporting axis A of the roll 12b on an advancing path of the rubber material 201 stripped from the roll 12b, and guiding the rubber material 201 stripped from the roll 12b by the roller 151. One or more second rollers 171 are rotatably arranged on the downstream side of the roller 151 in the advancing path of the rubber material 201, and the advancing path of the rubber material 201 is defined in a desired direction, for example, a direction of conveyor 51.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a scraper for rubber fabric and a method for scraping rubber fabric. [Background technology]

[0002] To manufacture rubber materials (master batches, rubber compounds) for producing rubber products, raw rubber (polymer) is masticated, and various chemicals are mixed into the raw rubber whose molecular chains have been cut by mastication. In the mixing process, various chemicals are mixed and dispersed uniformly as compounding agents into raw rubber such as NBR, EPDM, and NR.

[0003] Representative kneading machines for mastication and mixing include the open roll type and the closed type (closed type mixer). Of these, the open roll type is an open system kneading machine with two rolls arranged in parallel with a gap between them, and the individual rolls rotate in counter directions to masticate or knead the rubber dough put into the nip between the rolls.

[0004] When using an open-roll type kneader, it is necessary to cut off the masticated or kneaded rubber dough from the outer circumferential surface of the roll. The rubber dough cut off from the outer circumferential surface of the roll is fed back into the nip between the two rolls for further kneading, or is transported on a conveyer for the next process. There is known a technique for cutting out the rubber dough automatically without relying on human labor (see Patent Documents 1 and 2).

[0005] Patent Document 1 discloses an automatic cutting device that uses a knife to make circumferential cuts in the rubber material adhering to the outer peripheral surface of a roll, and then moves a scraper in the axial direction of the roll to peel the rubber material off from the roll.

[0006] Patent Document 2 discloses a method for kneading rubber material in which a scraper is brought into contact with a roll perpendicularly and the rubber material is peeled off from the surface of the roll as the roll rotates. [Prior art documents]

Patent Document

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0008] When peeling off rubber fabric by bringing a scraper into contact with a roll, the rubber fabric may stick to the scraper and remain. Especially when the width of the scraper is increased, for example, to a width that allows the rubber fabric to be peeled off from the roll all at once, the degree of adhesion of the rubber fabric to the scraper increases, and the retention phenomenon is likely to occur. When the rubber fabric thus remains, the operation of peeling off the rubber fabric from the roll is hindered, and a solution is required.

[0009] In this regard, Patent Document 3 introduces a kneading method of a rubber material in which a blade wheel-shaped scraper provided with peeling blades radially from a rotating shaft is provided with substantially the same width as a kneading roll, and the scraper is rotated in the same direction as the roll to peel off the rubber fabric (see paragraph

[0016] of Patent Document 3). Since the scraper has substantially the same width as the roll, it is presumed that the rubber fabric is peeled off from the roll all at once.

[0010] However, the scraper described in Patent Document 3 is different in shape and peeling principle from the plate-shaped scrapers described in Patent Documents 1 and 2. It does not provide a clue to solve the problem of rubber fabric retention occurring in the plate-shaped scraper.

[0011] The present disclosure seeks a solution to the phenomenon of rubber fabric retention occurring in a plate-shaped scraper.

Means for Solving the Problems

[0012] One embodiment of a scraper for rubber dough is a plate-shaped scraper having a blade at its tip that is arranged so as to be able to come into contact with the surface of a roll of an open-roll type kneader, and which scrapes off the rubber dough by bringing the blade into contact with the surface of the rotating roll, and a roller that is arranged in a portion of the scraper located on the traveling path of the rubber dough scraped off from the roll and rotates around an axis parallel to the axis of the roll. The roller is partially housed in a recess provided at the position of the blade edge of the blade, and is positioned so that the center of rotation of the roller does not extend beyond the surface of the blade edge so that it rotates when pushed by the peeled-off rubber material.

[0013] One embodiment of the rubber material scraping method includes a step of contacting a plate-shaped scraper blade with a surface of a roll of an open-roll type kneader to scrape the rubber material from the surface of the rotating roll, and a step of separating the rubber material from the surface of the scraper by a roller that is disposed on the path of travel of the rubber material scraped from the roll and rotates around an axis parallel to the axis of the roll. The roller is partially housed in a recess provided at the position of the blade edge of the blade, and is positioned so that the center of rotation of the roller does not extend beyond the surface of the blade edge so that it rotates when pushed by the peeled-off rubber material. Effect of the Invention

[0014] This prevents the rubber material from sticking to the scraper and becoming stuck. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a schematic diagram showing a schematic configuration of a kneading apparatus having an open roll type kneader. [Diagram 2] FIG. [Diagram 3] FIG. 2 is an enlarged side view of the rubber dough scraper. [Figure 4] FIG. 2 is an enlarged front view of the rubber fabric scraper. [Diagram 5] 1A is a side view of a kneader showing the phenomenon of rubber dough sticking to the scraper, which occurs when a roller is not provided, and FIG. 1B is a side view of a kneader showing the phenomenon of rubber dough stagnation, which occurs when a roller is not provided. [Figure 6] FIG. 2 is a side view of the kneader showing the operation of peeling the rubber dough from the rollers. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of a rubber material scraper and a rubber material peeling method will be described with reference to the drawings.

[0017] 1 shows a schematic configuration of a rubber kneading device 1 having an open roll type kneader 11. The kneading device 1 is equipped with a scraper device 101 to which a scraper 111 for rubber dough of the present embodiment is applied.

[0018] The kneader 11 has two rolls 12a, 12b arranged horizontally and parallel to each other, and transmits the driving force of a motor M1 to each of the rolls 12a, 12b via a power transmission mechanism 13. Each of the rolls 12a, 12b is supported rotatably about a support shaft A, and rotates by receiving the driving force of the motor M1. The power transmission mechanism 13 transmits the driving force of the motor M1 to the support shaft A of each of the rolls 12a, 12b so that the roll 12a located on the left side in FIG. 1 rotates clockwise, and the other roll 12b located on the right side rotates counterclockwise.

[0019] A conveyor 51 is provided adjacent to the kneader 11. The conveyor 51 is used to transport the rubber dough 201 kneaded by the kneader 11 to the next process. In this embodiment, the conveyor 51 is disposed adjacent to the roll 12b due to the structure for peeling off the band 202 of the rubber dough 201 wound around one of the two rolls 12a and 12b, the roll 12b.

[0020] Conveyor 51 has a structure in which belt 54 is stretched between drive roller 52 and driven roller 53, each of which rotates around a support shaft A, and transmits the driving force of motor M2 to support shaft A of drive roller 52 via power transmission mechanism 55. Power transmission mechanism 55 transmits the driving force of motor M2 to support shaft A of drive roller 52 so that drive roller 52 rotates clockwise in FIG.

[0021] As shown in Fig. 2, the scraper device 101 holds a rubber dough scraper 111 so that it can move freely in the vertical direction in Fig. 1 (see the arrow in Fig. 2). The rubber dough scraper 111 receives power from a solenoid S via a power transmission mechanism 102 and moves in the vertical direction in Figs. 1 to 6.

[0022] The rubber material scraper 111 includes a scraper 131 , a roller 151 and a second roller 171 .

[0023] Scraper 131 is a plate-like member that is driven by solenoid S to move up and down, and has a blade 132 at its tip. Blade 132 is disposed so as to be able to come into contact with the surface of one of rolls 12b in accordance with the up and down movement of scraper 131. The contact position is the right side portion of roll 12b facing conveyor 51 in FIG. 1, and is at a position higher than support shaft A of roll 12b.

[0024] As shown in Fig. 2 and Fig. 6, the roller 151 is disposed on the moving path of the rubber material 201 peeled off from the roll 12b by the scraper 131. The moving path of the rubber material 201 is the position of the blade surface 133 of the blade 132 of the scraper 131. The roller 151 is disposed at the position of the blade surface 133 of the blade 132.

[0025] As shown in FIGS. 3 and 4, the roller 151 is rotatable about a support shaft A1 that is arranged parallel to the support shafts A of the rolls 12a and 12b.

[0026] Such a roller 151 is partially housed in a recess 134 provided in the blade surface 133 of the blade 132. The recess 134 is formed horizontally, that is, parallel to the support shaft A of the rolls 12a, 12b. The storage depth of the roller 151 in the recess 134 is a depth at which the center of rotation RA (see FIG. 3) passing through the center of the support shaft A1 is located on the blade surface 133 of the blade 132. As a result, the center of rotation RA of the roller 151 is positioned at a position that does not protrude to the outside from the surface of the scraper 131 (the blade surface 133 of the blade 132).

[0027] A plurality of, for example, four second rollers 171 are provided. The second rollers 171 are disposed downstream of the rollers 151 in the traveling direction of the rubber material 201.

[0028] 3 and 4, like roller 151, second roller 171 is also rotatable about shafts A2-A5 arranged parallel to shaft A of rolls 12a and 12b. A2 is the shaft of second roller 171 arranged closest to roller 151, A3 is the shaft of second roller 171 adjacent thereto, A4 is the shaft of second roller 171 adjacent thereto, and A5 is the shaft of second roller 171 arranged farthest from roller 151.

[0029] Such second rollers 171 are arranged at positions that can determine the travel path of the rubber material 201 separated from the scraper 131 by the roller 151 in the direction of the conveyor 51.

[0030] 3 and 4, roller 151 and second roller 171 are rotatably attached to a roller frame 191 (frame). Roller frame 191 has support pieces 192 facing each other at both ends bent at right angles, and support shaft A1 of roller 151 and support shafts A2-A5 of second roller 171 are rotatably attached to these support pieces 192.

[0031] The rubber dough scraper 111 includes a frame 112 to which a scraper 131 is fixed, and a roller frame 191 is fixed to the frame 112. As a result, the roller 151 and the second roller 171 are held by the frame 112 together with the scraper 131.

[0032] In this configuration, to manufacture rubber materials (master batches, rubber compounds) for producing rubber products, raw rubber (polymers) such as NBR, EPDM, and NR are masticated, and various chemicals are kneaded into the raw rubber whose molecular chains have been cut by mastication to produce the rubber material. The process of kneading various chemicals into the raw rubber is called kneading.

[0033] The kneading device 1 of the present embodiment can be used for masticating raw rubber, and for kneading various chemicals into the raw rubber.

[0034] To perform the mastication process, rubber dough 201, which will become the raw rubber, is placed in the nip between two rolls 12a and 12b of the kneader 11, and the two rolls 12a and 12b are rotated by the driving force of the motor M1. The rubber dough 201 passes through the nip and is wound around one of the rolls, 12b, to form a band 202. If the rolls 12a and 12b continue to rotate in this manner, the molecular chains of the rubber dough 201 are cut, and raw rubber that can be kneaded is produced.

[0035] To carry out the kneading work, the masticated rubber dough 201 and compounding agents consisting of various chemicals are placed in the nip between the two rolls 12a and 12b of the kneader 11, and the two rolls 12a and 12b are rotated by the driving force of the motor M1. The rubber dough 201 passes through the nip together with the chemicals and is wound around one of the rolls, 12b, to form a band 202. If the rolls 12a and 12b continue to rotate in this manner, the compounding agents are uniformly mixed and dispersed in the rubber dough 201, which is the raw rubber, to become a rubber material (master batch, rubber compound).

[0036] After the rubber material 201 has been kneaded or mixed, the scraper device 101 cuts the band 202 wound around the outer circumferential surface of one of the rolls 12b, separates the rubber material 201 from the roll 12b, and sends it out to the conveyor 51. The effects of the scraper device 101 will now be described.

[0037] When the rubber material scraper 111 is driven by the solenoid S, the scraper 131 descends together with the frame 112, and the blade 132 bites into the band 202 wound around the outer circumferential surface of the roll 12b, cutting the band 202. At this time, since the roll 12b continues to rotate, the rubber material 201, which is the cut band 202, rides on the cutting edge 133 of the blade 132 and is separated from the roll 12b.

[0038] The rubber material scraper 111 of this embodiment is equipped with a roller 151. In order to explain the effect of the roller 151, the operation when the roller 151 is not provided is shown in Figures 5(A) and (B).

[0039] As shown in FIG. 5(A), when the scraper 131 descends and the blade 132 cuts the band 202 wrapped around the outer peripheral surface of the roll 12b, the rubber material 201 sent out by the rotation of the roll 12b adheres to the cutting edge 133 of the blade 132 due to its adhesive force.

[0040] As shown in Fig. 5(B), if the roll 12b continues to rotate, the rubber material 201 adhering to the cutting edge 133 of the blade 132 has nowhere to go and remains there, which hinders the operation of peeling off the rubber material 201 from the roll 12b.

[0041] The rubber dough scraper 111 of this embodiment prevents the above-mentioned inconvenience from occurring by providing the roller 151. The mechanism by which the roller 151 prevents the rubber dough 201 from stagnation is as follows.

[0042] As shown in Fig. 6, in the method for peeling off the rubber material in this embodiment, the blade 132 of the scraper 131 is brought into contact with the surface of the roll 12b, and the rubber material 201 is peeled off from the surface of the rotating roll 12b (peeling process). After that, the rubber material 201 is separated from the surface of the scraper 131 by the roller 151 rotating around an axis parallel to the support shaft A of the roll 12b (separation process).

[0043] In the separation process, the rubber material 201 that has been run onto the blade surface 133 of the blade 132 by the cutting of the band 202 hits the roller 151 arranged in the blade surface 133 at its tip. The roller 151 is then pushed by the rubber material 201 and rotates around the support shaft A1. At this time, the roller 151 is partially housed in the recess 134 provided in the blade surface 133, and is arranged at a position where the rotation center RA does not extend beyond the surface of the blade surface 133 to the outside. Due to such arrangement conditions, the roller 151 rotates so that the part exposed from the blade surface 133 is fed in the direction along the traveling direction of the rubber material 201. As a result, the rubber material 201 is sent out to the roller 151 without adhering to and staying on the scraper 131.

[0044] The explanation will be supplemented.

[0045] The rubber material 201 that has climbed onto the blade surface 133 of the blade 132 comes into contact with the blade surface 133 before the tip of the rubber material abuts against the roller 151. At this time, the rubber material 201 only comes into contact with the blade surface 133 for a short distance before it reaches the roller 151, and does not stick to and remain on the blade surface 133.

[0046] The rubber material 201 also comes into contact with the roller 151, but the contact position with the roller 151 changes from moment to moment as the rubber material 201 is sent out with the rotation of the roll 12b. Therefore, the rubber material 201 does not stick to the roller 151 and remain there.

[0047] Therefore, according to this embodiment, it is possible to prevent the rubber material 201 from sticking to the scraper 131 and becoming stuck there.

[0048] As shown in Fig. 6, the rubber material 201 sent out by the roller 151 is guided by the second roller 171, and its moving path is determined. At this time, the rubber material 201 comes into contact with the second roller 171 at a position lower than the support shaft A2-A5, so the second roller 171 rotates in the sending direction of the rubber material 201, and sends out the rubber material 201 without sticking. As a result, the rubber material 201 is guided to the conveyor 51 and prepared for the next process.

[0049] Various modifications and variations are possible when implementing the present invention.

[0050] For example, the position of the roller 151 is not limited to the position of the cutting edge 133 of the blade 132, but may be any position that can prevent the rubber material 201 from sticking to the scraper 131 and becoming stuck there.

[0051] As long as it is possible to prevent the rubber material 201 from sticking to the scraper 131 and becoming stuck there, the roller 151 does not have to be partially positioned in the recess 134, and the center of rotation RA of the roller 151 does not have to be positioned so as to not extend outward from the surface of the blade face 133 (scraper 131).

[0052] In the above embodiment, the second roller 171 is provided, but in practice, the second roller 171 may be omitted, and the destination to which the rubber material 201 is guided by the second roller 171 does not necessarily have to be the conveyor 51.

[0053] Any other variations or modifications are permitted. [Explanation of symbols]

[0054] 1. Mixing equipment 11 Kneading machine 12a Roll 12b roll 13 Power transmission mechanism 51 Conveyor 52 Drive roller 53 Driven roller 54 Belt 55 Power transmission mechanism 101 Scraper device 102 Power transmission mechanism 111 Rubber scraper 112 frames 131 Scraper 132 Blade 133 Blade surface 134 Depression 151 Lola 171 The Second Roller 191 Roller frame (frame) 192 Support piece 201 Rubber Fabric 202 Band A spindle A1 Support shaft (roller) A2-A5 Support shaft (second roller) M1 Motor (Roll) M2 motor (conveyor) RA Rotation Center S solenoid

Claims

1. a plate-shaped scraper having a blade at its tip that is arranged so as to be able to come into contact with the surface of a roll of an open-roll type kneader, and bringing the blade into contact with the surface of the rotating roll to scrape off the rubber material; a roller disposed in a portion of the scraper located on a path of travel of the rubber material peeled off from the roll and rotating about an axis parallel to the axis of the roll; Equipped with The roller is partially housed in a recess provided at the position of the blade surface of the blade, and is disposed at a position where the center of rotation of the roller does not extend outward from the surface of the blade surface so that the roller rotates by being pushed by the peeled rubber material. Scraper for rubber fabrics.

2. The roller is rotatably supported on a frame fixed to the scraper.

2. The rubber dough scraper according to claim 1.

3. and one or more second rollers that are rotatably supported on the frame downstream of the roller in the direction of travel of the rubber material and that determine the travel path of the rubber material.

3. A rubber dough scraper according to claim 2.

4. A step of bringing a plate-shaped scraper blade into contact with a surface of a roll of an open roll type kneader to scrape off the rubber material from the surface of the rotating roll; A step of separating the rubber material from the surface of the scraper by a roller arranged on the path of travel of the rubber material peeled off from the roll and rotating about an axis parallel to the axis of the roll; Equipped with The roller is partially housed in a recess provided at the position of the blade surface of the blade, and is disposed at a position where the center of rotation of the roller does not extend outward from the surface of the blade surface so that the roller rotates by being pushed by the peeled rubber material. How to remove rubber fabric.

5. The method includes a step of determining a travel path of the rubber material by one or more second rollers rotatably provided downstream of the roller in the travel direction of the rubber material, The method for peeling rubber material according to claim 4.

6. The rubber material is guided by the second roller to a conveyor disposed adjacent to the roll. The method for peeling rubber material according to claim 5.

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