JP3280012B2 - Tire bead removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to crushing and crushing of used old tires, especially large rubber tires for used vehicles such as trucks and buses by a crusher as waste materials in order to reuse them without incineration. When using waste for fuel or other purposes after processing, the bead with several steel wires bundled inside the rubber tire is pulled out from the rubber tire and removed before disposal by the crusher. The present invention relates to a bead removing device.

[0002]

2. Description of the Related Art Conventionally, used large rubber tires have been incinerated without being reused. However, on the premise of reuse, when rubber tires are crushed by a crusher, there are tire beads. Since the crushing blade is severely damaged and cannot be processed practically, it is required to remove tire beads.

[0003]

However, when a bead ring (hereinafter abbreviated as "bead") is pulled out of this large rubber tire (hereinafter abbreviated as "tire"), 25,000 kg or more can be obtained on one side only by a jig including a pulling claw. In addition, since the tires have different adhesive strength between the bead and the tire depending on the tire manufacturer, the pulling process at a constant speed may cause the beads to be cut off and prevent them from coming off. Since the worn tires are different in wear condition, there is a problem that the pulling claw and the inside of the tire are entangled with each other, resulting in poor pullout and poor workability. Furthermore, in the case of large tires, the degree of entanglement between the bead and the rubber is also greatly different, and the amount of rubber sticking to the bead being pulled out varies, and if a lot of rubber sticks to the bead, the bead is discarded as waste material As a result, there is a problem in that the transaction is refused during processing.

SUMMARY OF THE INVENTION The present invention is intended to easily eliminate these conventional disadvantages, and adjusts the bead withdrawing force and speed from a large rubber tire so that the bead withdrawing operation can be accurately performed and the tire can be removed in the bead removing operation. Prevents misalignment between the inside and the pull-out claw, greatly reduces the incidence of work failures, keeps tires intact, keeps them safe, and allows for efficient disposal without sticking rubber to the pulled-out beads. It is an object of the present invention to provide a tire bead removing device which has high reliability and can greatly enhance bead removing operation efficiency.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a tire mounting table on which a rubber tire is placed and raised and lowered, and a bead pulling claw on a rim portion of the rubber tire on the tire mounting table are driven by a driving unit having a hydraulic circuit. A bead removing mechanism slidably provided, and a jig plate having an opening for inserting and removing the bead withdrawing claw, and a jig plate for opening and closing the opening, and a tire presser holding the rubber tire on the jig plate. When the hydraulic pump provided in the hydraulic circuit of the drive unit is raised to a certain pressure so that the plate is freely opposed to and separated from each other and the bead pulling force of the pulling claw is inversely proportional to the bead pulling speed, the hydraulic pump is And a mechanism for automatically controlling the discharge amount to a set value.

According to the present invention, the tire pressing plate is provided with a reflective photoelectric sensor for detecting a tire position for detecting the inside of the rubber tire in a movement path of the rubber tire on the tire mounting table. It is also characterized in that the photoelectric sensor controls the distance between the inside of the rubber tire and the pull-out claw.

Further, the jig plate is provided so as to be slidably opposed to a slide plate facing the bead pull-out opening, and a driving cylinder of each slide plate or this driving cylinder is used instead of the driving cylinder. Provided in the hydraulic circuit a servo motor that can control by converting pressure into an electric signal,
It is also characterized in that the cylinder or the servomotor is controlled by detecting the extraction pressure, and the opening is narrowed by a slide plate. In this case, the holding plate is
A hydraulic pump for a hydraulic circuit having a positioning cylinder pressed against a side surface of a rubber tire, the drive cylinder being provided in a hydraulic circuit of a pull-out driving unit of the bead pull-out claw, and pressing the rubber tire against the jig plate at a constant pressure; But,
Low pressure large flow, high pressure small flow can be controlled by a single hydraulic pump, the discharge amount is automatically changed by increasing or decreasing the pressure, and the bead / pulling claw is fast-forwarded,
Slow feed can be performed, and the hydraulic pressure is controlled by slowing the drawing speed at high pressure and by rapidly moving the drawing speed at low pressure.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment of the present invention, a bead provided on a rim portion of a rubber tire on a tire mounting table on which a rubber tire is placed and raised is slidably provided by a drive unit having a hydraulic circuit. When the pulling claw of the removing mechanism pulls out, the pulling force (pressure) of this bead pulling claw,
By automatically adjusting the pulling speed, the beads can be easily and reliably removed from the rubber tire without being cut.
In other words, since the adhesion force between the bead and the rubber tire is different depending on the tire manufacturer, there is a problem that the bead is not cut and pulled out at a constant drawing speed, so if a large pulling force is required for the bead pulling claw, the pulling speed should be reduced. When the speed is slow, and when a large pulling force is not required, the pulling speed is adjusted so as to remove the beads efficiently.

In this case, the bead pulling claw is moved forward and backward with respect to the rubber tire held by the hydraulic cylinder to hook and remove the bead, but the hydraulic pump used in the hydraulic circuit including the hydraulic cylinder is raised to a constant pressure. At times, the discharge amount of the pump is automatically controlled to a set value, and a bead removing operation is performed. The bead removing mechanism for the rubber tire has an opening for inserting and removing the bead withdrawing claw, a jig plate for opening and closing the opening, and a tire holding plate for holding the rubber tire on the jig plate. Are arranged so as to be able to freely contact and separate from each other, so that the position value of the rubber tire with respect to the jig plate can be reliably determined.

[0010] Thus, the rubber tire is placed on the tire mounting table, raised by the elevating mechanism to a standby position where the pulling claw enters the inside of the tire, and then the tire pressing plate is pushed out and the rubber tire is pressed against the jig plate at a constant pressure. While holding, the rubber tire is set to the pulled-out position. At this time, the position of the inside of the tire and the position of the pull-out claw are automatically detected. If the balance between the inside of the rubber tire and the pull-out claw is not maintained, it has a large effect on whether the bead comes off or not, and the wear condition of the old rubber tire outer diameter differs depending on the tire. When fixed to a certain position with a proximity switch, etc., the height varies depending on the tire and it becomes impossible to pull out well. Therefore, the inside of the rubber tire (inner diameter) is detected by the photoelectric sensor and the pulling claw and the hooking condition of the tire inside are detected. Do the best.

Further, the size of the opening of the jig plate is automatically adjusted according to the pulling force of the pulling claw. For example, the adhesive strength (entanglement degree) between the bead and the rubber varies greatly depending on the manufacturer, so that the amount of sticking of the rubber to the bead when the bead is pulled out differs. For this reason, when a large amount of rubber sticks to the bead, it is necessary to make the opening smaller and peel off the rubber from the bead. In addition, the extracted beads are sold as waste material, but since a large amount of rubber is adhered to, there is a case where a take-back trader refuse to take the bead, so that the adhesion of rubber is reduced as much as possible. If the bead contains a lot of rubber, the pull-out force (pressure) will be large, so adjust by moving the slide plate cylinder and narrowing the opening of the jig plate.

[0012] Further, even when the side surface of the tire is pulled out by the holding plate, the tire is always pressed against the jig plate with a constant force, and the bead is pulled out at a right angle to the jig plate. If you pull out the tire with the presser plate without pressing it against the jig plate, the tire will be distorted and the bead will be cut, so if you press the tire against the jig plate with a certain force, the jig plate and the presser In order to move up and down without deforming between the plates, it is preferable to take care that the beads are always pulled out at a nearly right angle.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 5. A tire mounting table 2 having a lifter 1 on which a rubber tire A is mounted and raised and lowered, and a rubber tire A on the tire mounting table 2 are shown.
The extraction claw 3 of the bead B in the rim portion of the
There is a bead removing mechanism slidably provided by a drive unit 5 controlled by a hydraulic unit 4 having an opening, and an opening 6 for inserting and removing the pull-out claw 3 of the bead B. A jig for opening and closing the opening 6 is provided. The jig plate 7 is provided with a tire pressing plate 8 for holding the rubber tire A so as to be able to approach and separate freely, and the bead pulling force of the pulling claw 3 and the bead pulling speed are inversely proportional. And a control operation panel 10 of a mechanism for automatically controlling the discharge amount of the hydraulic pump to a set value when the hydraulic pump 9 provided in the hydraulic circuit of the drive unit 5 is raised to a certain pressure. is there.

As the jig plate 7, a pair of slide plates 11 slidably facing the bead pull-out opening 6 are slidably provided in a pair, and a driving cylinder 12 of each slide plate 11 is provided. It is provided in the hydraulic circuit 30 to control the cylinder 12 by detecting a pull-out pressure, and to narrow the opening 6 by the slide plate 11 (FIG. 3). The tire press plate 8 or the tire press plate 8
The cylinder / guide mounting base 29 provided with a reflective photoelectric sensor 13 for detecting a tire position which detects the inside of the rubber tire A in the movement path of the rubber tire A on the tire mounting base 2. The distance between the inside of the rubber tire and the pull-out claw 3 is adjusted by the photoelectric sensor 13. (FIG. 4) Note that, instead of the cylinder 12, a servo motor that converts pressure into an electric signal and controls the electric signal may be provided to drive the slide plate 11.

The tire pressing plate 8 has a rubber tire side surface.
A positioning cylinder 14 pressed against
The cylinder 14 is provided in the hydraulic circuit 30 and the bead pull is provided.
The pull-out drive unit 5 of the pull-out claw 3 and the cylinder 14
Switching valve control circuits 15, 15 ₁ Provided through
The rubber plate is pressed against the component plate 7 at a constant pressure.
You. Further, the hydraulic pressure used for the hydraulic unit 4
For the pump 9, control of low pressure large flow rate and high pressure small flow rate is one.
Can be performed by one hydraulic pump
The discharge rate is automatically changed by increasing or decreasing the
The pulling claw can be fast-forwarded and slow-forwarded.
0-200Kg / cm² 20 to 3 withdrawal speed
0mm / sec slow feed and low pressure 20-50
Kg / cm²Has a drawing speed of 80 to 100 mm / s
Hydraulic control system automatically controlled by ec fast-forward
It is recommended to use
Using a normal hydraulic pump instead of a hydraulic pump
High by other hydraulic equipment such as ON / OFF of solenoid operated valve
Use a configuration that switches between low pressure flow and low pressure high flow, and a switching valve.
Automatically sets the combined pressure and speed of the servo valve and controller.
A configuration that can be controlled freely can be used.

The hydraulic unit 4 is provided in association with the control operation panel 10 and has a hydraulic circuit 30, as shown in FIG. , A drive unit 5 for a bead pulling cylinder, a tire positioning cylinder 14 provided with a throttle valve 21, and a pressure reducing valve 1.
7. A hydraulic control circuit comprising a check valve 18 and capable of automatically adjusting the bead pulling force (pressure) and the pulling speed.

In this hydraulic control circuit, control operation is performed in advance.
The operation is performed according to the operation process set in the work table 10,
For example, when positioning tires, the switching valve control circuit
Fifteen ₁ By operating the switching valve 21 of the
The pressure oil discharged at the pump 9 is reduced in pressure by the pressure reducing valve 17,
The positioning cylinder 14 moves forward and backward. When pulling out
Means that the pressure oil switches the switching valve of the switching valve control circuit 15.
To move forward and backward into the drive unit 5 of the drawing cylinder
I do. In this case, the hydraulic pump 9 is constantly rotating,
If the pressure circuit is cut off and pressure oil does not flow,
The pressure in the circuit is increasing, and the hydraulic pump 9
The amount is zero. By operating from the switching valve
The pressure in the hydraulic circuit drops and the automatic adjustment valve in the hydraulic pump operates.
Oil flows according to the pressure into the circuit
Automatic adjustment of pulling force and pulling speed
The beads can be efficiently removed.

The lifter 1 is mounted on a frame 22 so as to be able to move up and down, and is connected to a gear motor 24 via a transmission mechanism 23, for example, a chain wheel and a chain.
The jig plate 7 and the tire holding plate 8 are opposed to the frame 22 by moving the
Has been deployed.

In the drawing, reference numeral 25 denotes a gantry, and reference numeral 26 denotes a guide rod, which is provided in the sliding stroke of the pull-out claw 3. Reference numeral 27 denotes a guide rail provided on a reciprocating path of the bead pulling claw. Reference numeral 28 denotes a guide rod which is provided for a sliding stroke of the tire pressing plate 8. 29 is a cylinder / guide mounting base.

The operation of the apparatus according to the embodiment will be described with reference to FIGS. 6 to 9.
The tire A is mounted and held on the upper side by fixing means (not shown), and the motor 24 is started from the set position of the tire (FIG. 6) to be raised by the lifter 1 to the standby position where the pull-out claw 3 enters the inside of the tire. Next, the pull-out claw 3 is advanced by the drive unit 5, enters the inside of the tire A, and is set at the bead pull-out position. (FIG. 7).

At this time, in order to keep a good distance between the inside of the tire A and the pull-out claw 3, the photoelectric sensor 13 provided on the tire pressing plate 8 or the cylinder / guide mounting base 29 causes the inside of the tire A (the inner peripheral edge) to be maintained. ) Is detected and the pull-out nail 3 is detected.
And stop the lifter to get the best fit inside the tire. When the tire holding plate 8 is advanced by the cylinder 14 and the tire A is lightly pressed against the jig plate 7 at a constant pressure to maintain the tire not to slip down, the lifter 1 is lowered, and the tire mounting table having the tire receiving portion is lowered. 2 and bead withdrawal position (FIG. 8).

Thus, the bead pulling claw 3 is
At high pressure, if the pulling speed is reduced by slow feed,
The pull-out claw 3 bites into the rim of the tire A, tears the tire, and the pull-out claw 3 is hooked on the bead B of the tire rim to start bead pull-out. As shown in FIG. Then, a detector such as a switch (not shown) arranged at this position
Then, the cylinder 12 is driven to move the pair of slide plates 11 facing the opening 6 of the jig plate 7 in the closing direction to narrow the opening 6. In this case, the size of the opening 6 of the jig plate 7 is automatically adjusted in accordance with the bead pull-out force so that a large amount of rubber sticking to the bead B is not attached. For example, when a large amount of rubber sticks to the bead, it is necessary to make the opening 6 small. However, the cylinder 12 is automatically adjusted by operating the switching valve of the control hydraulic circuit so that the rubber peeling function is operated from the drawn bead. be able to. When a large amount of rubber adheres to the bead, the bead pulling force (pressure) becomes large. Therefore, a pressure detector (not shown) is provided in the hydraulic circuit to detect this pressure, and the slide plate 11 is automatically moved. Alternatively, the cylinder 12 may be activated to narrow the opening 6 of the jig plate 7.

The side of the tire A is always pressed against the jig plate 7 by the tire pressing plate 8 with a constant force to perform bead pull-out operation. It is necessary to improve the working efficiency without deforming the tire by pulling it in a state close to that of the tire. Consider the braking of the holding plate 8 so that the holding plate 8 can be pulled out at right angles.

[0024]

According to the present invention, a tire mounting table on which a rubber tire is placed and raised and lowered, and a bead pulling claw on a rim portion of the rubber tire on the tire mounting table can be slidably moved by a driving unit having a hydraulic circuit. There is a bead removal mechanism provided, and an opening for inserting and removing the bead pulling claw, a jig plate for opening and closing this opening is provided, and a tire pressing plate for holding the rubber tire is brought into and out of the jig plate. When the hydraulic pump provided in the hydraulic circuit of the drive unit is raised to a certain pressure so that the bead pulling force of the pulling claw is inversely proportional to the bead pulling speed, the discharge amount of the hydraulic pump is reduced. By providing a mechanism that automatically controls the set value, the bead pulling force and speed can be adjusted from large rubber tires to ensure accurate bead pulling work and remove beads. Prevents misalignment between the inside of the tire and the pull-out claw in the industry, greatly reducing the incidence of work failures, and also keeps the tires safely intact without incomplete mounting, and is efficient without sticking the rubber to the bead being pulled out It can be disposed of well, has high reliability, and can greatly improve the bead removal efficiency.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a front view of the example of FIG.

3A and 3B show a jig plate used in the example of FIG. 1, wherein FIG. 3A is a front view thereof, and FIG. 3B is a longitudinal sectional view taken along line bb.

FIG. 4 is a partially enlarged longitudinal sectional view showing an operation state of the example of FIG. 1 and detecting a tire position.

FIG. 5 is a hydraulic circuit diagram of the hydraulic unit of the example of FIG.

FIG. 6 is a partial longitudinal sectional view showing a working state of the present invention and showing a tire setting state.

FIG. 7 is a partial longitudinal sectional view of a tire standby position in a next step of the example of FIG. 6;

8 is a partial longitudinal sectional view of a position where a bead is pulled out from a tire in a next step of the example of FIG.

FIG. 9 is a partial longitudinal sectional view of a state in which a bead is pulled out from a tire in the next step of the example of FIG. 8;

[Explanation of symbols]

Reference Signs List A rubber tire B bead 1 lifter 2 tire mounting stand 3 bead pulling claw 4 hydraulic unit 5 drive unit 6 opening 7 jig plate 8 tire holding plate 9 hydraulic pump 10 control operation panel 11 slide plate 12 cylinder 13 photoelectric sensor 14 cylinder 15, 15 ₁ Switching valve control circuit 16 Hydraulic tank 29 Cylinder / guide mount 30 Hydraulic circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-87177 (JP, A) JP-A-50-107086 (JP, A) JP-A-50-109978 (JP, A) 262833 (JP, A) JP-A-2000-43046 (JP, A) JP-A-2000-127167 (JP, A) JP-A-4-302702 (JP, A) JP-A-55-163504 (JP, U) Patent 3009891 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29B 17/00-17/02 B09B 5/00 F15B 11/00

Claims (5)

(57) [Claims] 1. A bead removing device comprising: a tire mounting table on which a rubber tire is mounted and which is moved up and down; and a bead removal claw provided on a rim portion of the rubber tire on the tire mounting table so as to be slidable by a driving unit having a hydraulic circuit. There is a mechanism and an opening for inserting and removing the pull-out claw of the bead, a jig plate for opening and closing this opening is provided, and a tire pressing plate for holding the rubber tire is provided on the jig plate so as to be able to freely contact and separate. When the hydraulic pump provided in the hydraulic circuit of the drive unit is raised to a certain pressure, the discharge amount of the hydraulic pump is automatically adjusted to a set value so that the bead pulling force of the pulling claw is inversely proportional to the bead pulling speed. Tire bead removing device provided with a mechanism for controlling the tire bead. 2. The tire presser plate further comprises a reflective photoelectric sensor for detecting a tire position, which detects the inside of the rubber tire in a movement path of the rubber tire on the tire mounting table, wherein the photoelectric sensor detects the tire position. 2. The tire bead removing device according to claim 1, wherein an interval between the inside of the rubber tire and the pull-out claw is controlled. 3. The jig plate is slidably opposed to a slide plate facing the bead pull-out opening, and a drive cylinder of each slide plate is provided in the hydraulic circuit. The tire bead removing device according to claim 1 or 2, wherein the cylinder is controlled by detecting a pull-out pressure, and the opening is narrowed by a slide plate. 4. The pressing plate has a positioning cylinder pressed against the side surface of the rubber tire, and the driving cylinder is provided in a hydraulic circuit of a pulling-out driving portion of the bead pulling-out claw. 4. The tire bead removing device according to claim 1, wherein the tire bead is configured to be pressed. 5. The hydraulic pump according to claim 1, wherein the control of the low pressure large flow rate and the high pressure small flow rate can be performed by a single hydraulic pump. 4. The hydraulic pressure control of the pulling claw can be performed at a high speed and a low speed, and the pulling speed is slow at a high pressure and the pull speed at a high speed at a low pressure.
Or the tire bead removing device according to 4.