JPH06102435B2 - Rubber crawler repair method and repaired rubber crawler - Google Patents

Abstract

PURPOSE:To connect the cut places of a rubber crawler so as to reuse the rubber crawler by applying surface treatment such as buffing to the cut places of the rubber crawler, and press-curing the rubber crawler after disposing a steel cord arranged rubber sheet between a body layer and an outer peripheral layer. CONSTITUTION:In order to mend an endless belt rubber crawler cut in the width direction, a crawler body 1 is cut open circumferentially from the cut face K in a range of including at least three core metals 2, leaving a thin rubber layer (t) on the outer peripheral side of a steel cord 4. The crawler body 1 is separated into body layers 1a and outer peripheral layers 1b, and surface treatment such as buffing is applied to the cut faces K and cut-open faces L. An unillustrated steel cord arranged rubber sheet is then disposed on the respective cut-open faces L of both body layers 1a with the mutual cut faces K thereof set opposedly, and the outer peripheral layers 1b are disposed on the upper face thereof. The whole cut-open face L is then press-cured to connect the cut faces K of the crawler body 1 for the regeneration of the endless belt rubber crawler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repairing a rubber crawler that has been cut or pulled out.

[0002]

2. Description of the Related Art A to C in FIG. 7 are for explaining a conventional rubber crawler, where A is a plan view (outer peripheral side), B and C.
2A and 2B are cross-sectional views taken along line X-X and Y-Y of A, respectively, in which 1 is a rubber crawler body, 2 is a core metal, 2a and 2b are central engaging portions of the core metal 2 and wing portions on both sides, respectively. (2c is a protrusion), 3 is an engagement hole, 4 is a steel cord, and 5 is a grounding lug. As shown in the figure, the cored bar 2 is embedded in the crawler main body 1 at a constant interval p in the circumferential direction. , 2 between the engaging holes 3
Is formed in the center of the crawler width.
a and the engagement holes 3 are alternately arranged, and a plurality of steel cords 4 are arranged in a row in a row in the vicinity of the outer peripheral sides of the wing portions 2b, 2b of the cored bar 2, and the steel cord layers 4a, 4a are embedded in both sides of the engagement hole 3 in a distributed manner, and a ground lug 5 is provided on the outer peripheral surface of the crawler body 1 so as to correspond to the embedded position of the cored bar 2.

FIG. 8 shows a state in which a rubber crawler is mounted. G is a steel cord overlapping portion, S ₁ is a sprocket, and S ₂ is an idler (S ₃ is a rolling wheel). The steel cord 4 goes around the inside and overlaps both ends to form an endless belt. Also, the idler S ₂
The wound tightly on sprockets S ₁ rubber crawler body 1 by applying a pressure of arrow F direction, the driving tooth bottom and the tooth tip of the sprocket is consistent with the engagement portion 2a and the engaging hole 3 of the core, respectively The force is surely transmitted, and between the wing portion 2b of the cored bar and the steel cord 4 in the rubber crawler body 1 and between both ends of the steel cord 4 in the overlapping portion G. Since they are bonded and joined through a thin rubber layer, the driving force is transmitted from the sprocket to the core engaging portion and then from the core blade to the steel cord to drive the entire circumference of the rubber crawler. .

[0004]

A large amount of tension is generated in correspondence with the driving force while the rubber crawler is running, and debris and the like are caught on the inner peripheral surface of the rubber crawler during uneven terrain work. If it is bitten by a rolling wheel or idler, a larger tension (hereinafter referred to as an abnormal tension) is applied. At this time, the inner peripheral surface of the width direction center of the rubber crawler (location of the core metal engaging portion). Since both sides are in contact with the sprocket S ₁ and the idler S ₂ so that the tension cannot be relieved, both sides in the width direction (the location of the core metal blade)
In this case, the wing portion 2b of the core metal is slightly elastically deformed to the inner peripheral side to relieve the tension. At this moment, the tension is concentrated on each of the steel cords on both sides of the center to cut it, and then the next one The tension is concentrated on the book and the book is cut, and then the book is cut in the width direction at a stretch.

On the other hand, if the above-mentioned extreme concentration of tension does not occur, momentary cutting does not occur, but in this case, stress concentrates on the superposed portion of the steel cord and the thin rubber layer between the steel cords. The steel is rapidly fatigue fractured, and the steel cord is pulled out in a short period of time. In addition, as an accident that the steel cord is cut, when the steel material is impacted over a relatively sharp iron material such as a building demolition site, the steel cord may be cut at a stretch with the rubber layer on the ground side surface, In this case, even if the steel cord is not cut, the rubber layer on the ground side surface has a cut, which causes moisture on the road surface to penetrate into the steel cord layer, causing the steel cord to move rapidly. It is deteriorated and weakened, and is cut with the tension that is usually applied to the rubber crawler.

At present, there is no effective cutting prevention measure against such an abnormal accident, and such an abnormal accident occurs regardless of the degree of use of the rubber crawler, and the use time is short. Even if the wear such as the ground lug was slight, the steel cord that had been cut had to be discarded because there was no effective regeneration method in the past. SUMMARY OF THE INVENTION The present invention is intended to connect and reuse a cut location of a rubber crawler where a steel cord is cut due to the above-mentioned abnormal accident or the like.

[0007]

A feature of the present invention is that a cored bar is embedded in a rubber crawler body at regular intervals in the circumferential direction, and steel cords are embedded in layers on the outer peripheral side of the cored bar, When an endless rubber crawler with a grounding lug projecting on the surface is cut in the width direction, leave a thin rubber layer on the outer peripheral side of the steel cord layer in the area including at least three embedded cores in the circumferential direction from the cut surface. On the other hand, the main body layer including the steel cord layer and the cored bar, and the outer peripheral layer including the grounding lug on the outer peripheral side of the main body layer, and the cut surfaces of the main body layer and the outer peripheral layer, respectively. The cut surface is subjected to a surface treatment such as buffing, and the cut surfaces of both body layers are mated with each other, and the metal cores on both sides of the mated cut surfaces are at the above-mentioned constant intervals, and Incision in the body layer connected to both sides of the face A steel cord array rubber sheet having a length of the range and a width substantially the same as that of the steel cord layer of the main body layer is formed on the main body layer of steel in the range of at least three embedded core bars on both sides of the mating surface above. It is arranged so as to overlap with the cord layer, and then the outer peripheral layer is aligned with the upper surface of the steel cord arranged rubber sheet, and the steel cord arranged rubber sheet is wrapped between the outer peripheral layer and the main body layer, and then the whole incision surface is covered with rubber. This is to insert the crawler into a mold for vulcanization and press-vulcanize it for a predetermined time to connect the cut points and regenerate the endless belt.

Further, when the endless rubber crawler causes a pulling accident at the steel cord overlapping portion G, a thin rubber is formed on the outer peripheral side of the steel cord 4g 'located on the outer peripheral side of the overlapping portion G of the rubber crawler where the pulling occurs. Except for the layer, an area including the overlapping portion G and at least three buried cores adjacent to the overlapping portion G is incised, and a portion including the steel cord 4g 'at the incision portion is cut off, while the cut portion is cut off. The main body layer 1a ′ including the steel cord layer and the core metal on the inner peripheral side of the incision except for the part, and the outer peripheral layer 1b ′ including the grounding lug which is the outer peripheral side of the entire length of the incision, and each of the above The cut surface and the cut surface are subjected to a surface treatment such as buffing, while the release surface and the cut surface of the main body layer 1a ″ including the steel cord 4g ′ on the inner peripheral side in the overlapping portion G are also subjected to the same surface treatment. , The other body layer 1a ' And 1a ″ of the main body layer 1a ′ which are joined to each other, and the metal cores on both sides of the joined cut surface have the above-mentioned constant spacing, and which are connected to both sides of the mating surface. And 1a ″ on the cut surface and the peeling surface, respectively, on both sides of the mating surface, at least in the range of at least three embedded cores, and the length of the range and the width substantially the same as the steel cord layer of the main body layer. The steel cord arranged rubber sheet is arranged so as to overlap with the steel cord layer of the main body layer, and then the outer peripheral layer 1b ′ is aligned with the upper surface of the steel cord arranged rubber sheet, and the steel sheet is arranged between the outer peripheral layer and the main body layer. The cord array rubber sheet is wrapped, and then the entire incised surface is inserted into a rubber crawler vulcanizing mold and press-vulcanized for a predetermined time to connect the cut points and regenerate endless belts.

In the above-mentioned repair method, the outer peripheral layer including the grounding lug is cut off, and is appropriately mounted on the steel cord arranged rubber sheet arranged on the cut surfaces of both main body layers connected to both sides of the mating surface. Of unvulcanized rubber of various shapes and volumes, and then the entire incised surface is inserted into the rubber crawler vulcanizing mold and press vulcanized for a certain period of time, so that the outer peripheral layer of the repaired area is replaced with new rubber You may form.

[0010]

In the repairing method of the present invention, an area including at least three buried cores is cut out on both sides of an interrupted portion of the steel cord, leaving a thin rubber layer on the outer peripheral side of the steel cord, and the incision is made. By encapsulating the steel cord arranged rubber sheet in the above-mentioned portion and press-vulcanizing it to integrate it into the rubber crawler main body, the intermittent portion has sufficient polymerized portions on both sides and is crosslinked. At this time, the metal cores on both sides of the cut portion should have the same size as the original metal core embedding space so that the meshing with the sprocket is not hindered.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates a method of cutting the cut rubber crawler main body 1. In the drawing, K is a cut surface produced by cutting a steel cord 4, and L is a steel cord 4.
The cut surfaces 1a and 1b on the outer peripheral side are the inner peripheral layer and the outer peripheral layer which are the inner peripheral side and the outer peripheral side of the cut surface L, respectively. As shown in the figure, a thin rubber layer t is formed on the outer peripheral side of the steel cord 4. The remaining area including the three buried cores is cut and separated into the main body layer 1a and the outer peripheral layer 1b, and buffing is performed on the surfaces of the cut surface K and the cut surface L in the same manner as a normal vulcanized rubber bonding method. Surface treatment.

2A to 2C show a steel cord array rubber sheet 6, A is a plan view, B and C are side views in the length direction and the width direction, respectively, and 6a is a rubber crawler main body 1. As shown in FIG. It is a covered rubber made of unvulcanized rubber of almost the same quality as the rubber, and as shown in the figure, the steel cords 4 are arranged and buried inside the covered rubber 6a, and the length n extends over six buried cores. The length is in the range, and the width n'is substantially the same as the width of the steel cord layer 4a in the main body layer 1a. In this case, the unvulcanized rubber material of the covering rubber 6a is a brass plating layer on the steel cord surface and a rubber. You may mix | blend the adhesion improvement agent etc. with a quality.

3A to 3C are explanatory views of a method of connecting cut surfaces, and A shows a state in which a steel cord arranged rubber sheet is arranged at a cut portion, and cut surfaces K and K are shown.
Cutting planes L, L of the main body layers 1a, 1a that are joined and connected to each other
The steel cord arranging rubber sheet 6 is arranged at a position where it overlaps with the steel cord layer 4a in the main body layer 1a, and at this time, the core bar interval p'on both sides of the cut surfaces K, K mated with each other is initially set. Therefore, the filling rubber q is appropriately embedded in the gap formed between the cut surfaces K and K, and in this case, the filling rubber q is used.
For this purpose, unvulcanized rubber of the same quality as that of the rubber crawler main body 1 is used. In addition to this, a filled rubber q having an appropriate shape is arranged at a necessary portion of the incision surface, and after press vulcanization described later. And make sure there are no voids in the repair area.

FIG. 1B shows the outer peripheral layers 1b, 1 from both sides of the upper surface of the steel cord array rubber sheet 6 arranged on the cut surface.
FIG. 6B shows a state in which b is wrapped together, after which the entire incision surface is placed in a rubber crawler vulcanizing mold 7 as shown in FIG. 7C and press vulcanized for a predetermined time (7a Is the upper mold, 7b is the lower mold), during this press vulcanization,
The unvulcanized rubber such as the coated rubber 6a and the filled rubber q flows and fills the gaps such as the cut surface and the cut surface and then is vulcanized. Therefore, in the rubber crawler main body, the main body layer 1
a and the steel cords 4 of the steel cord array rubber sheet 6 are bonded and integrated with each other through a thin rubber layer, and the cut portions are connected to each other to be reproduced on the endless rubber crawler.

FIGS. 4A and 4B illustrate an example of a pretreatment method for a cut surface, where A indicates a deleted portion R, which is inside the cut surface K of the main body layer 1a as shown in FIG. The range extending to the peripheral surface and the range extending from the cut surface K of the outer peripheral layer 1b to the inclined surface of the lug 5 on the outer peripheral surface are slightly deleted.
Shows a state after the filling rubber q is embedded in the deleted portion R and press-vulcanized. If the interval between the cut surfaces is wide as shown in this figure, the press-vulcanization is performed. Filled rubber q
Since the flow of the material is good and every corner is filled, there are no voids in the repaired area. Also, if the angle between the cut surface and the inner and outer peripheral surfaces is large, press vulcanization is possible. Durability of the repaired rubber crawler because the strain is less likely to concentrate on the boundary surface v between the filled rubber q and the cut surface K on the inner peripheral surface and the outer peripheral surface of the rubber crawler and the interface peeling does not occur. Will be good.

5A to 5D illustrate a method of repairing a rubber crawler that has been pulled out. A shows a state before repairing, and 4g and 4g 'in the drawing are in the overlapping portion G, respectively. Steel cords on the inner and outer circumferences, H
Is a peeling surface, and the rubber crawler 1 in this figure is cut at the cut surfaces K, K at both ends of the overlapping portion G due to shear peeling between the steel cords 4g, 4g ', and B is 1A ′ and 1a ″ in the figure show the incision points, respectively, and the points adjacent to the overlap portion G and the overlap portion G, respectively.
The main body layer at the location, 1b 'is the outer peripheral layer, L'is the incised surface, R'is the cut-off portion, and the steel cord 4g' is shown in the figure.
Of the overlapped portion G and the overlapped portion G leaving a thin rubber layer t on the outer peripheral side of the
A region including three buried cores adjacent to is cut, and after removing the cut portion R ′ including the steel cord 4g ′, the cut face L ′, the peeling face K ′, and the cut face K are subjected to surface treatment such as buffing. Do it.

FIG. 1C shows a pair of body layers 1a ',
1a ″ shows a state in which a steel cord array rubber sheet 6 is arranged on the cut surface L ′ and the peeling surface K ′, and the outer peripheral layer 1b ′ is wrapped around the upper surface of the steel sheet. It is placed in a mold and press-vulcanized for a predetermined time, and D indicates the rubber crawler thus repaired.

FIGS. 6A and 6B illustrate another embodiment, in which A is the outer peripheral layers 1b and 1b on both sides of the upper portion of the steel cord array rubber sheet 6 in the state of FIG. 3B shows a state in which an unvulcanized rubber Q is arranged, and FIG. 3B shows a state in which the entire incision surface is arranged in the rubber crawler mold 7 and press-vulcanized, as in FIG. 3C. Therefore, the portions of the outer peripheral layers 1b and 1b in FIG. 3C are formed by the unvulcanized rubber Q. According to the method of this figure, it is not necessary in the method of FIG. Although the vulcanized rubber Q is required, pretreatment of the outer peripheral layer 1b is not required, so that the repair work can be simplified and the work efficiency can be improved.

[0019]

According to the repair method of the present invention, the surface of the vulcanized rubber such as the cut surface and the cut surface of the main body layer and the outer peripheral layer at the cut portion is subjected to the surface treatment such as buff treatment. The cord array rubber sheet is covered with unvulcanized rubber, and the filling rubber q is inserted at the required places on the cut surface and the incision surface, and between the vulcanized rubber at the repaired point and between the vulcanized rubber and the steel cord. In this state, unvulcanized rubber intervenes.Since it is placed in the rubber crawler vulcanizing mold in this state for press vulcanization, the above-mentioned vulcanized rubber at the repair point after vulcanization , And the vulcanized rubber and the steel cord are completely bonded and integrated.

Further, steel cords for repair (steel cords in a rubber cord-arranged rubber sheet) are provided close to the outer peripheral side of the cut steel cords on both sides of the cut portion so as to cover at least three buried cores. Since they are polymerized and embedded, the cut portions are connected with sufficient tensile strength.

Besides, in order to make the interval between the cored bars on both sides of the cut portion of the steel cord the same as the initial interval between the embedded cored bars,
The meshing with the sprocket is smoothly performed, and as a result, it is possible to reuse the rubber crawler, which has been used as a waste because the steel cord is cut or pulled out.

[Brief description of drawings]

FIG. 1 shows a method of cutting a cut rubber crawler body.

FIG. 2 shows a steel cord array rubber sheet,
A is a plan view, and B and C are lengthwise and widthwise side views, respectively.

FIG. 3 shows a method of connecting cut surfaces, where A is a state in which a steel cord-arranged rubber sheet is arranged at a cut position,
Is a state in which the outer peripheral layers are wrapped together from both sides of the upper surface of the steel cord array rubber sheet arranged on the cut surface, C
Indicates the vulcanized state.

4A and 4B show an example of a pretreatment method for a cut surface, where A is a deleted state and B is a state in which a filling rubber is embedded in a deleted portion and press-vulcanized.

FIG. 5 illustrates a method for repairing a rubber crawler in which a steel cord is pulled out, where A is a state before repair,
B shows an incised state, C shows a state in which a steel cord-arranged rubber sheet is placed on the incised surface and is superposed, and D shows a state where repair is completed.

6 shows another embodiment, in which A is a state in which the outer peripheral layers 1b and 1b in FIG. 3A are cut and a steel cord array rubber sheet is arranged on the upper side, and B is a vulcanized state by a mold. Indicates.

FIG. 7 shows a conventional rubber crawler, in which A is a plan view and B and C are cross-sectional views taken along line XX and YY of A, respectively.

FIG. 8 shows a mounted state of the rubber crawler.

[Explanation of symbols]

 1 Rubber Crawler Main Body 2 Core Bar 4 Steel Cord 6 Steel Cord Arrangement Rubber Sheet 7 Rubber Crawler Vulcanizing Mold L Cut Surface K Cut Surface q Filled Rubber

Claims (4)

[Claims] 1. An endless rubber band in which a cored bar is embedded in a rubber crawler main body at regular intervals in a circumferential direction, and steel cords are embedded in layers on the outer peripheral side of the cored bar, and a grounding lug is projected on the outer peripheral surface. When the crawler cuts in the width direction, a range including at least three embedded cored bars is cut out in the circumferential direction from the cut surface, leaving a thin rubber layer on the outer peripheral side of the steel cord layer, while including the steel cord layer and the cored bar. The main body layer and the outer peripheral layer on the outer peripheral side of the main body layer including the grounding lug are separated from each other, and the cut surface and the cut surface of the main body layer and the outer peripheral layer are subjected to surface treatment such as buffing, and the other. The cut surfaces of both body layers are made to mate with each other, and the metal cores on both sides of the mated cut surfaces have the above-mentioned constant intervals, and on the cut surfaces of the body layers connected to both sides of the mating surface. At least on both sides of the mating surface in Also, a steel cord arrangement rubber sheet having a length within the range and a width substantially the same as that of the steel cord layer of the main body layer is arranged so as to overlap with the steel cord layer of the main body layer in a range over the three embedded core bars, and then, The outer peripheral layer is aligned with the upper surface of the steel cord arranged rubber sheet, the steel cord arranged rubber sheet is wrapped between the outer peripheral layer and the main body layer, and then the entire incision surface is inserted into a rubber crawler vulcanizing mold. A method for repairing a rubber crawler, characterized in that by cutting and vulcanizing for a predetermined period of time, the cut points are connected and regenerated into an endless band. 2. An endless rubber band in which a cored bar is embedded in the rubber crawler main body at regular intervals in a circumferential direction, steel cords are embedded in a layer shape on the outer peripheral side of the cored bar, and a grounding lug is projectingly provided on the outer peripheral surface. When the crawler pulls out at the steel cord overlapping portion G, the overlapping portion G of the rubber crawler where the pulling out occurs
A thin rubber layer is left on the outer peripheral side of the steel cord 4g ′ located on the outer peripheral side of the, and a range including at least three buried cores adjacent to the overlapping section G and the overlapping section G is incised, and at the incision location. The portion including the steel cord 4g 'is cut off, while the steel cord layer and the main body layer 1a' including the core metal on the inner peripheral side of the incision portion excluding the cut portion and the outer peripheral side of the entire length of the incision portion. Outer layer 1 including a ground lug
b ', and each of the incised and cut surfaces is subjected to a surface treatment such as buffing, while the peeling surface and the cut of the main body layer 1a "including the steel cord 4g' on the inner peripheral side in the overlapping portion G are cut. The surface is similarly subjected to the surface treatment so that the cut surfaces of the main body layers 1a ′ and 1a ″ are mated with each other, and the intervals between the cored bars on both sides of the mated cut surfaces are the above-mentioned constant intervals. And, in the range over at least three embedded cores on both sides of the mating surface on the cut surface and the peeling surface of the body layers 1a ′ and 1a ″ connected to both sides of the mating surface, respectively, And a steel cord array rubber sheet having a length substantially the same as the steel cord layer of the main body layer are arranged so as to overlap with the steel cord layer of the main body layer, and then the outer peripheral layer 1b ′ is formed on the upper surface of the steel cord array rubber sheet. Between the outer layer and the body layer It is characterized in that the steel cord array rubber sheet is wrapped, then the entire incision surface is inserted into a rubber crawler vulcanizing mold and press vulcanization is performed for a predetermined time to connect the cut points and regenerate an endless belt. How to repair a rubber crawler. 3. The method of repairing a rubber crawler according to claim 1 or 2, wherein the outer peripheral layer including the ground lug is cut off,
Place unvulcanized rubber of an appropriate shape and volume on the steel cord array rubber sheets arranged on the cut surfaces of both body layers connected to both sides of the mating surface, and then cut the entire cut surface with a rubber crawler. A method for repairing a rubber crawler, which comprises inserting into a vulcanizing mold and press-vulcanizing for a predetermined time to connect the interrupted portions of the steel cord to regenerate an endless belt. 4. A rubber crawler repaired by the repair method according to claim 1, 2 or 3, wherein the rubber crawler is close to the outer peripheral side of the interrupted portion of the steel cord layer at the repaired portion, and to both sides of the interrupted portion. A rubber crawler repairing an interrupted portion of a steel cord layer, characterized in that a steel cord layer having a length within the range is buried in a state where the steel cord layers are superposed in a range over at least three embedded cored bars.