JPS5944221B2 - Retreaded tire manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a retreaded tire manufacturing apparatus that adheres new rubber to the tread portion of a worn tire to make it usable again.

Generally, tire retreading work is carried out in the following order: (-) tire sorting, (d) puffing, i.e., cutting and polishing, (iii) applying rubber glue, (iv) applying new rubber, and (v) pressing and vulcanizing the new rubber. Among the above steps (d), the puffing operation is the most important, and the skill of this operation determines the value of the product.

The puff machine conventionally used for the above-mentioned work has a sliding part 9 placed on a bottom plate 11 so as to be slidable by a pneumatic cylinder 10, as shown in FIG. 1a or 1b. A rotary wheel 14 on which a ground tire 3 is attached is rotatably configured by an electric motor 4, and a mold 1 at the tip thereof is mounted on a tire mounting base 15 with an adjusting wheel 5.
A tracing device 16 is disposed in which the base plate 1 is moved forward and backward, and the idler wheel 12 is engaged with the die, and the buff wheel 2 rotated by the electric motor 1 is brought into contact with the tire.
A grinding tire 3 is attached to a rotary wheel 14 which is rotatably mounted on a tire mounting base 15 which is rotatably mounted by an electric motor 4 on a tire mounting base 15 which is pivoted on a fixed shaft 8 and hinged on a hinge 7, and is tilted toward the hinge side by an adjustment wheel 5. There is one that is configured to be freely rotatable around the fixed shaft with a handle 6, and that a buffing wheel 2 rotated by an electric motor 1 is brought into contact with the tire.

That is, a rotary puff wheel is pressed against a rotating tire by applying internal pressure, and the tread is cut and polished from its slanted side.The shape of the tread has a specific curved surface, and it is necessary to maintain this shape. However, it is extremely difficult to create such a curved surface using the above-mentioned puff machine, and it is difficult to obtain an accurate curved surface because the work must be done by hand or by eye.

In addition, even for machines with a tracing mold, the mold is the standard, and Daikichi relies on manual work.

The tire curved surface matches the mold curved surface in the vulcanization process, but the curved surface varies depending on the pattern, size, etc., and is not constant. Therefore, the retreaded tire has a shape and dimensions similar to the vulcanizer mold. This means that it is conveniently adapted to something that has .

An object of the present invention is to provide a retreaded tire manufacturing apparatus that can easily process tires into any desired shape in view of the current situation.

Next, the second embodiment of the present invention will be explained.
3.4 and 5, it consists of a puff mechanism 50, a copying mechanism 51, and a hydraulic pressure generating mechanism 52, and first the puff mechanism 5
0, sliding tables 111 and 111' are installed with a space in front and behind in the sliding direction, and the puff machine bodies 105 and 105' are slidably placed on the tables, respectively. Perpendicular axis circumference.

Puff wheel 102.1 rotated by electric motor 101.101'
02' are mounted facing each other, and a vertical support shaft 108 and a circular track 11 with the support shaft center as the rotation center are installed in the space between the sliding tables.
0, and the bottom plate of the tire holding stand 113 is rotatably inserted into the support shaft. At the same time, the holding stand supporting wheel 112 is attached to the end of the bottom plate, and the holding stand is placed on the track. The stand is rotatable around a vertical support shaft 108, and the holding stand has a tire holding shaft 11 rotated around a horizontal axis by an electric motor 104.
A pneumatic cylinder J117 is installed at the tip of the holding shaft.
An expansion drum 118 with a built-in cylinder is installed, and the drum is expanded with the cylinder to attach the ground tire 103, and the tire bead is sealed to maintain internal pressure in the tire. Inching hydraulic cylinders 106 and 106' for sliding the machine body are installed, and a rotating hydraulic cylinder 107 for rotating the tire holding stand is installed, and a tire lifting/lowering pneumatic cylinder 109 is installed at the bottom of the expansion drum of the holding stand. Deploy and push up the upper part of the cylinder ram 1
The ground tire is placed on the pneumatic switch valve 161.
The following is a description of the tracing mechanism 51.The following describes the tracing mechanism 51.
A detector sliding table 125, a cylinder sliding table 128 and a mold sliding table 129 are attached to the detector sliding table, and the sliding plate 13 is attached to the detector sliding table.
3 is inserted so that it can slide freely as the iron hydraulic cylinder 126 expands and contracts, and the end of a detector holding rod 130 is pivotally connected to the sliding plate, and a long groove hole 134 is provided near the other end of the holding rod. A detector 122 is mounted on the pivot point side, and another sliding plate 135 with another hydraulic cylinder 1273 pivotally attached to the cylinder sliding base is slidably inserted, and a V-shaped plate is attached to the end of the cylinder ram. One end of the mold holding arm 123 is pivotally attached, and a moving arm 136 having a female thread is fixed to the sliding plate, and a threaded rod 131 driven by an electric constant rotation motor 124 is screwed into the female thread. and another sliding plate 1 having another movable arm 137 fixed to the mold sliding table and screwed onto the threaded rod.
38 is slidably inserted, the center part of the mold holding arm is pivotally connected to the sliding plate, and a protruding shaft 139 is provided at the other side end of the holding arm so that the detector holding rod is It fits into the long groove hole 134 and allows the cardboard mold 121 to be attached freely.

Therefore, according to the rotation of the motor, the cylinder sliding table sliding plate 135 and the mold sliding table sliding plate 138 slide in synchronization, and at the same time, the detector holding rod 130 is driven, and the cylinder sliding table In response to the expansion and contraction of the hydraulic cylinder 127, the detector holding rod is similarly driven.

In addition, the detector 122 has a pneumatic jet port and a pneumatic pressure receiving port that face each other, and when a blocker enters between them, the pressure at the pressure receiving port changes, so the detector 122 detects this change and transmits it to the electromagnetic switching valve described later. It is something to do.

Next, the oil pressure generation mechanism 52 will be explained.
40. Pressure oil generated from a hydraulic pump 141 etc. is connected to an electromagnetic switching valve 142, and the valve port A 143 is branched into two via a check valve 144, one of which is connected to an electromagnetic switching valve 145.
The other branch is further branched to the electromagnetic switching valve 1 via the branch valve 146.
47 and to the electromagnetic switching valve 149 via the flow dividing valve 148, and the port B150 is also connected to the flow control valve 151.
, is connected to the flow path of the switching valve 145 via the check valve 152, and the port A153 of the switching valve 145 is connected to the ram side of the tire holding stand rotating hydraulic cylinder 107, and the port B154 is connected to the cylinder sliding hydraulic cylinder. The piston sides of both cylinders are connected to the ram side of the switching valve 147, and the piston sides of the two cylinders are connected to the port A155 and port B15 of the switching valve 147.
6 are the ram side of the inching hydraulic cylinder 106 of the puff machine main body, respectively;
Also on the piston side, port A157 of the switching valve 149
B158 is on the ram side of the detector slide hydraulic cylinder 126, and B158 is on the puff machine body inching hydraulic cylinder 106'.
The piston sides of both cylinders are connected to the ram side of the cylinder, and the piston sides of both cylinders are communicated with each other.

Therefore, when either the hydraulic cylinder 127 or 107 is pressurized by switching the switching valve 145, the internal pressure on the piston side of each cylinder is the same as the pressurization on the ram side, and the rams operate synchronously. Switching valve 147, 149
When operated synchronously, hydraulic cylinders 126, 106, 1
The ram of 06' also operates synchronously, and the puff machine body 105
, 105' are husband hydraulic cylinders 106 and 106', the detector holding rod 130 is driven by the hydraulic cylinder 126, and the mold holding arm 123 and the tire holding stand 113 are rotated in response to the operation of the switching valve 145. It turns out.

It is assumed that the pneumatic cylinder 117 of the expansion drum 118 and the tire lifting/lowering pneumatic cylinder 109 are operated by pneumatic switching valves 160 and 161 connected in parallel to the pneumatic source 159, respectively.

As shown in FIG. 5, the puff wheels 102 and 102' are constructed into a circular shape by combining a large number of arc-shaped thin steel plates 163 provided with sawtooth teeth 162, and grind the tires by rotating them at high speed to give them a bare surface. Create.

According to this invention, the tire holding stand 11 of the puff mechanism 50
The grinding tire 103 is fitted and attached to the expansion drum 118 of the tire holding shaft 116 of No. 3 by operating the tire elevating pneumatic cylinder 109, and the pneumatic switching valve 160 is operated to expand and fill the internal pressure to bring it into a high speed rotation state. During this time, a cardboard mold 121 is attached to the protruding shaft 139 of the mold holding arm 123 of the copying mechanism 51.

This cardboard mold has a shape that matches the puff-ground surface 165 inside the tire groove bottom 164 illustrated in FIG.

Next, hydraulic pressure is generated to move the mold holding arm and the tire holding stand, rotate the tire at a predetermined position, and then rotate the puffing wheel 102° 102' while bringing the puffing machine main body 105, 105' closer. Start grinding from the side of the tire.

The detector 122 detects the shape of the cardboard mold, operates the hydraulic cylinder 126 in the escape direction, switches at the center of the mold, moves in the cutting direction, and stops at the opposite angle to the starting position. , the puffing machine body moves back and returns to the center of the tire holding stand, exhausts the expansion drum air pressure and removes the ground tire.

[Brief explanation of the drawing]

Figures 1a and 1b are a perspective view of a conventional puff machine, and Figure 2 is a perspective view of a conventional puff machine, respectively.
The figure is a perspective view of a puff mechanism showing an embodiment of the present invention, FIG. 3 is a perspective view of a copying mechanism, and FIG.
FIG. 5 is a circuit diagram of the hydraulic pressure generating mechanism, and FIG. 5 is an explanatory diagram of a buff ring, and FIG. 6 is an explanatory diagram of a cardboard type. 50... Puff mechanism mechanism, 51... Copying mechanism, 52.
...Hydraulic pressure generation mechanism, 102, 102'...Puff wheel, 1
03...Grinded tire, 110...Circular track, 111
゜111'...Sliding stand, 113...Tire holding stand,
121... Cardboard etc. type, 122... Detector, 123...
...Mold holding arm, 125...Detector sliding table, 128...
・Cylinder sliding table, 129... type sliding table, 130...
・Detector holding rod, 142, 145, 147, 149...
・Solenoid switching valve, 160.161...Pneumatic switching valve.

Claims (1)

[Claims] 1 Puff machines in which a tire holding stand for rotatably holding a ground tire is installed in the center, and puffing machine bodies with rotatable puffing wheels are arranged on both sides of the holding stand so as to be able to move toward and away from each other. The structure and the detector holding rod with the detector attached are pivotally connected to the sliding plate which slides by the expansion and contraction of the hydraulic cylinder.
The cylinder slide table is provided with other sliding plates that slide in synchronization with each other, and a hydraulic cylinder is pivotally connected to the former sliding plate, and one side end of a V-shaped holding arm is pivotally connected to the ram end of the hydraulic cylinder. , the center part of the holding arm is pivotally attached to the latter sliding plate, and a profiling mold is freely attached to the other end of the holding arm, and a part thereof is inserted into the long groove hole provided in the detector holding rod. A copying mechanism that is slidably inserted and engages a detector and a copying die, and a detector that detects the shape of the copying die suppresses rotation of the tire holding stand and sliding of the puffing machine body. A retreaded tire manufacturing device consisting of a hydraulic pressure generating mechanism.