JP4468348B2 - Tire bead removal method and apparatus - Google Patents

Description

  The present invention relates to a tire bead removing method and apparatus for extracting and removing a bead incorporated in a rubber tire by a pulling claw that moves forward and backward (back and forth).

  Conventionally, a rubber tire to be discarded is set on a jig plate, a bead that bundles a plurality of steel wires embedded in the rim is locked to a pull-out claw, and a hydraulic drive type advance / retreat operation that moves the pull-out claw forward and backward A tire bead removing device that pulls out a bead from a rubber tire through a jig groove formed in a jig plate by being retracted by an operating mechanism is already known (for example, Patent Document 1).

In the bead removal work of the tire bead removing device, the bead in the rubber tire has a difference in the adhesive force in the entire circumference of the rim part. The tensile strength is different, and the bead pulling resistance varies depending on the type of tire and the situation of the rim portion. Accordingly, since the bead may be cut in the operation of retracting the extraction claw at a constant speed, the bead extraction force and the bead extraction speed are controlled by a hydraulic automatic adjustment valve that constitutes the advance / retreat operation mechanism ( The hydraulic cylinder) is adjusted to prevent the bead from being cut and the rubber from sticking to the bead.
JP 2001-341132 A

  The tire bead removing device disclosed in Patent Document 1 performs bead pulling force and bead pulling speed by adjusting the drive of a hydraulic cylinder to suppress bead cutting and bead rubber adhesion. However, the pulling-out claw advance / retreat mechanism can only be configured by complicated and expensive hydraulic equipment consisting of hydraulic automatic adjustment valves, hydraulic pumps, hydraulic cylinders, etc., so the equipment becomes expensive and the disposal cost of rubber tires rises, etc. There is a problem.

  In addition, the hydraulic drive type advance / retreat mechanism has the disadvantages of high hydraulic loss and low drive efficiency, and it is difficult to control the limit value at which beads with different pulling resistances are cut only by the hydraulic pressure and pulling speed. In addition, the response and reliability of the hydraulic control are lacking, and there is a disadvantage that bead cutting is inevitable in a portion where the processing amount is not small. For example, in a conventional example using hydraulic pressure, about 10 to 20% of bead cutting occurs in the bead drawing processing amount. In addition, there is a problem that the control structure for ensuring the responsiveness is extremely complicated and the driving efficiency is deteriorated.

  In order to solve the above-mentioned problems, the present invention firstly, the bead 2a of the rubber tire 2 fixedly supported with respect to the body frame 9 is moved forward and backward by a forward / backward operation mechanism 6 provided on the body frame 9. In the bead removal method in which the bead 2a is pulled out by being locked by the pulling nail 5 and moving the pulling nail 5 forward and backward, the pulling nail 5 is stopped during the drawing process after the drawing operation is started, and the bead pulling process is elastic. The extraction claw 5 is moved forward to a predetermined position in a direction to restore the shape of the deformed rubber tire 2, and the bead 2a is pulled out by moving backward again after stopping the forward movement.

  Secondly, when the extraction claw 5 is stopped in the course of the extraction, it is detected that the bead extraction load has reached a preset value and is stopped.

  Third, when the extraction claw 5 is stopped in the middle of the bead extraction progress and driven forward in the reverse direction, the extraction claw 5 is utilized by using the elastic restoring force of the elastically deformed rubber tire 2 as a power source for the forward drive. Is driven forward.

  Fourth, a tire support portion 3 that holds the rubber tire 2 in a predetermined posture, a pullout claw 5 that locks and pulls out the bead 2a of the rubber tire 2, and an advance / retreat operation mechanism 6 that drives the pullout claw 5 forward and backward. The provided device is characterized in that the advance / retreat operating mechanism 6 includes a screw shaft 31 that attaches the extraction claw 5 to the tip, and a ball nut 52 that drives the screw shaft 31 to move forward and backward by rotation.

  Fifth, a tire support portion 3 that holds the rubber tire 2 in a predetermined posture, a pulling claw 5 that locks and pulls out the bead 2a of the rubber tire 2, and an advancing / retracting operation mechanism 6 that drives the pulling claw 5 forward and backward. In the provided apparatus, the advancing / retreating operation mechanism 6 has an extraction rod 5 at the tip and an operation rod 79 provided with a chain 77 along the side surface, and meshes with the chain 77 to drive the operation rod 79 forward / backward by rotational drive. A sprocket 59 is provided.

  Sixth, the chain 77 is detachably stretched along both sides of the operating rod 79, and the sprockets 59 on both sides are arranged to face each other.

  Seventh, a motor 19 that drives the advancing / retreating operation mechanism 6 to move forward / backward is provided, and a detection device that detects that the bead withdrawal load has reached a preset setting value, and the detection device performs the above detection to detect the motor 19. And a stop device for stopping the operation.

  Eighth, it is characterized in that a reverse rotation allowing mechanism for allowing at least the forward drive of the extraction pawl 5 after stopping of the motor 19 is provided.

  Ninth, after the motor 19 is stopped, a control device for driving the pulling claw 5 forward by driving the motor 19 in the reverse direction is provided.

  According to the present invention configured as described above, when the pulling claw that has advanced through the forward / backward operation mechanism by forward rotation of the drive motor moves backward by hooking the bead to the hook claw by reverse rotation, Thus, the forward rotation of the drive motor is interrupted, and the pulling claw can be temporarily advanced by reversing the ball nut via the screw shaft by the deformation restoring force of the rubber tire at the time of extracting the bead or the forward rotation of the drive motor. This makes it possible to automatically correct the bead pulling posture with respect to the hook claw, and because the bead is temporarily loosened, the peeling from the rubber in the rubber tire is promoted, and the rubber dust adheres and pulls out during redrawing. Can be reduced. Therefore, the bead pulling load can be reduced, and the bead removing operation can be smoothly performed by preventing the bead from being cut by the forward / backward operation mechanism having a simple configuration.

  In addition to facilitating forward drive (forward rotation of the ball nut) by the restoring force of the rubber tire after a temporary stop by using a ball screw for the advance / retreat operation mechanism that advances and retracts the extraction pawl in the front-rear direction of the machine frame, it is complicated and expensive A hydraulic cylinder or hydraulic valve is not required, and a simple and inexpensive forward / backward operation mechanism with high transmission efficiency can be achieved.

  Further, by engaging a sprocket with the chain provided along the side surface of the operating rod having the extraction pawl 5 and driving it forward and backward, it is possible to provide a forward and backward operating mechanism with a simple and inexpensive structure, and a series of bead removal operations. Provided is a tire bead removing device that can be easily controlled.

  Further, the advancing / retracting mechanism provided with a chain detachably along the side surface of the operating rod can have a simple and inexpensive structure in which a commercially available chain is stretched over the operating rod and meshed with the sprocket. Replacement work can also be performed easily.

  Embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a side view showing a state in which a lifter device (rubber tire support portion) 3 for raising and lowering a rubber tire 2 is set on the tire bead removing device 1 according to the first embodiment of the present invention. It is an action top view of the principal part showing the composition which pulls 2a on extraction claw 5, and pulls out by advance / retreat operation mechanism 6. FIG. 3 is a front view of the tire bead removing device 1 with the lifter device 3 omitted, and FIG. 4 is a cross-sectional view showing the configuration of the pulling claw 5 and the die portion 7. FIG. 5 is a front view showing the shape of the jig groove 8 a of the jig plate 8, and FIG. 6 is a back cross-sectional view showing the slide support structure of the extraction claw 5. FIG. 7 is an overall side view of a tire bead removing device having an advance / retreat operation mechanism according to a second embodiment of the present invention, and FIG. 8 is an enlarged side view showing the configuration of the main part of the advance / retreat operation mechanism of FIG. FIG. 8 is a plan view of the advance / retreat operation mechanism, and FIG. 10 is a back sectional view showing the structure of the advance / retreat operation mechanism and the guide rail.

  First, the tire bead removing device 1 according to the first embodiment has a horizontal frame 9a provided horizontally on the abdomen of a horizontally long box frame-shaped body frame 9, and a slide support structure installed along the upper portion of the horizontal frame 9a. , A forward / backward operation mechanism 6 for moving the extraction claw 5 back and forth in the bead removal work direction, and a die portion installed at the center of the wall plate 9b attached to the left front surface of the body frame 9 7 etc.

  The machine body frame 9 is provided with a control panel 10 for driving operation in the vicinity of the die portion 7 and a control panel 10a having a control device (not shown) for controlling the entire apparatus at a position in the vicinity of the advancing / retracting operation mechanism 6 respectively. Yes. The operation panel 10 is connected to various operation and setting switches. In addition, the control device in the control panel 10a includes position sensors 11, 12, 13, 14, 15, 16 for detecting the first to seventh positions of the pulling claw 5 that is turned ON by contact with a sensor piece 60 described later. , 17 and the like are connected, and the drive motor 19 of the advancing / retracting operation mechanism 6 is rotationally controlled so that the extraction claw 5 is stopped at the forward and backward positions set according to the tire size to be processed. It is configured to move forward and backward.

  As a result, the tire bead removing device 1 is configured so that the rubber tire 2 is lifted and stopped above the jig groove 8a of the jig plate 8 by the lifter device 3, and the main switch 20 and the automatic start switch 20a of the operation panel 10 shown in FIG. Enter and operate. As a result, a ball nut 52 of the advance / retreat operation mechanism 6 to be described later is driven to rotate forward and backward by the drive motor 19, and the extraction pawl 5 is moved forward (leftward) from the solid line stop position (last retracted position) in FIG. The first bead removal work position A and the second bead removal work position B shown in FIG.

  Then, when the lifter device 3 lowers the rubber tire 2 at the first bead removal work position A or the second bead removal work position B where the extraction pawl 5 is inserted into the jig groove 8a and protrudes and stopped in the tire hole of the rubber tire 2. A tire set state in which the rim portion of the rubber tire 2 is placed on the claw hook 5c of the extraction claw 5 can be obtained.

  Positioning advance / stop of the first bead removal work position A of the extraction pawl 5 is performed by detection of the fifth position sensor 15, and positioning advancement / stop of the second bead removal work position B is performed by detection of the seventh position sensor 17.

  In the bead removal operation, first, in the tire set state at the first bead removal operation position A, when the extraction claw 5 is retracted by the reverse rotation of the drive motor 19, the hook claw 5a breaks the first rim portion on the side close to the jig plate 8. The internal bead 2a can be locked, and the bead 2a can pass through the jig groove 8a and be detached from the first rim portion. At this time, the stop of the last retracted position of the extraction pawl 5 is determined by the position detection of the first position sensor 11 in the case of a large diameter rubber tire, and the position detection of the third position sensor 13 installed in the middle of the stroke in the case of a small diameter rubber tire. The drive motor 19 is stopped when each sensor detects the last withdrawal of the extraction claw 5 determined by the above.

  When the bead removal of the first rim portion at the first bead removal work position A is completed as described above, the dropped rubber tire 2 is received and supported by the tire mount 70 on the tire mount 70, and is raised again to be in a tire set state. . Then, the drive motor 19 is rotated in the forward direction, the extraction claw 5 reaches the second bead removal work position B, the other second rim portion of the rubber tire 2 is positioned, and the hook claw 5a is turned into the second rim portion by the reverse rotation of the drive motor 19. The second bead removing operation is completed by the same operation as described above, and the bead removing operation on both rim portions of one rubber tire 2 is completed.

  In the above bead removal operation, it is desirable that the extraction pawl 5 is moved backward and stopped, and then advanced to the standby position C of the bead removal operation close to the jig plate 8 as shown by the dotted line in FIG. The bead removal work can be performed efficiently. The return claw 5 is returned to the standby position C by detecting the position of the fourth position sensor 14.

  Further, as shown in FIG. 3, the operation panel 10 includes a forward switch 21 and a backward switch 22 for moving the extraction claw 5 forward and backward by manual operation, an intermittent operation adjusting switch 23 for intermittently moving the extraction claw 5 backward, An emergency stop switch 25 for stopping the drive motor 19 at any time is provided.

  Further, another control panel 10a shown in FIG. 1 is provided with a backward drive force adjustment switch 26 and a forward drive force adjustment switch 27 for adjusting and setting the backward drive force and the forward drive force of the drive motor 19 by adjusting the volume. ing. In addition, a tire adjustment switch 28 is provided for performing a dedicated adjustment setting for the backward driving force or speed of the small-diameter rubber tire 2 with a small pull-out load (resistance) of the bead 2a. Accordingly, it is possible to appropriately perform the bead removing operation for various rubber tires 2 by selecting and operating each switch corresponding to the type and size of the rubber tires 2 or the type of old tires having a large pulling resistance accompanied by the occurrence of rust.

  In the bead removal operation, if a small number of bead wires cut in the jig groove 8a are locked or rubber scraps are likely to adhere, a weak driving force can be obtained by operating the forward driving force adjusting switch 27 in advance. Thus, the extraction claw 5 can be advanced. Thereby, the extraction claw 5 can smoothly perform the bead removal operation while extruding the bead wire and the rubber scraps from the jig groove 8a without receiving excessive resistance.

  Next, the structure of each part of the tire bead removing device 1 will be described in detail. First, the drawing claw 5 and its slide support structure will be described with reference to FIGS. The pull-out claw 5 made of a thick steel plate connects the main body portion 5b on the base side to the tip end portion of the screw shaft 31 of the advance / retreat operation mechanism 6 via the attachment shaft 30 and the attachment bracket 30a. The pull-out claw 5 is detachably provided with a slide base 32 made of a horizontal plate at the bottom of the main body 5b, and is formed in an inverted T shape in rear view.

  And the extraction nail | claw 5 extends the nail | claw hook 5c formed in a taper shape toward the advancing side from the middle part of the main-body part 5b, and forms the upward hook-like hook nail | claw 5a in the front-end | tip part integrally. .

  The bottom surface of the claw 5c is formed in a straight line that is substantially horizontal at a position away from the bottom surface of the slide base 32 by a predetermined height.

  As shown in FIG. 4, the height of the bottom surface of the claw hook 5 c is set to be approximately the same as the thickness of a side guide 34 described later, so that the gap between the claw hook 5 c, the mounting plate 36, and the guide rail 37 is set. A discharge space K is formed. The discharge space K can drop and discharge the rubber scraps that are peeled off from the bead 2a and pulled into the jig groove 8a when being pulled out without clogging the jig groove 8a.

  The extraction pawl 5 includes a regulation bar 5d erected on the upper part of the main body 5b and a regulation cover 5e erected on the upper part of the mounting bracket 30a. As a result, when the bead 2a immediately after being pulled out by being locked and pulled out from the rubber tire 2 is separated from the pull-out claw 5 due to the repulsive force, the scattered bead 2a is brought into contact with the regulating bar 5d. Can be dropped. Further, the restriction cover 5e can receive the scattered beads 2a that are in contact with the restriction bar 5d and reliably drop them to a predetermined discharge position.

  As shown in FIG. 6, the slide support structure of the extraction pawl 5 has a pair of side guides 34 in which symmetrical guide surfaces are cut out on both sides of the bottom guide 33 fixed to the upper part of the horizontal frame 9a. 34 is detachably mounted and fixed. Thus, the guide rail 37 having the dovetail-shaped guide groove 38 is formed, and the main body portion 5b of the extraction claw 5 is slidably inserted and supported in the guide groove 38.

  In the advance / retreat operation mechanism 6, the pull-out pawl 5 guided by the guide rail 37 to support the advance / retreat operation supports the front end of the screw shaft 31, and the rear end portion of the screw shaft 31 is supported by a guide support roller 61 described later. In this state, the ball nut 52 provided between the two supports the middle part of the shaft, so that the shaft is prevented from being bent and the transmission is stably performed, and the extraction claw 5 and the screw shaft 31 are smoothly advanced and retracted. Can do.

  In this configuration, as shown in FIG. 4, the side guides 34, 34 of the guide rail 37 have their front ends close to the die portion 7 with a rubber waste discharge distance L that forms the discharge space portion K, Block-shaped support pieces 39, 39 are extended and fixed toward the front side of the upper portion of the frame.

  As a result, the front end portions of the support pieces 39 can be brought into contact with the mounting plate 36 as will be described later, and the jig plate 8 is reinforced and supported from the guide rail 37 side with a simple configuration.

  Next, the die portion 7 will be described with reference to FIGS. The die portion 7 has a mounting frame 35 formed in an integral box frame shape in a vertical frame 9c erected on the front side of the horizontal frame 9a, and substantially the same as the jig groove 8a in the front portion of the mounting frame 35. A mounting plate 36 having a slot 8b having a shape is mounted and fixed, and the jig plate 8 is mounted and supported on the front side of the mounting plate 36 by a plurality of mounting screws.

  Further, the wall surface plate 9b attached to the front side of the vertical frame 9c has an insertion hole 40 for inserting the jig plate 8 in the upper central portion thereof, and the jig plate 8 is inserted and set in the insertion hole 40. The rubber tires 2 are flush with each other, support the side surfaces of the rubber tire 2 during the bead removal operation, and can smoothly guide the vertical movement of the rubber tire 2 when the bead 2a is pulled out.

  The vertical frame 9c is provided with a stopper 41 made of a cushioning material on the inner surface. The stopper 41 can receive and stop the main body 5b with buffering properties when the pull-out pawl 5 is accidentally overrun to the front side due to troubles of sensors or the like.

  The jig plate 8 is made of a steel plate having wear resistance, and has a jig groove 8a formed at the center and mounting holes for screw insertion at four corners. The jig groove 8a has a vertical groove 45 having a width and a height into which the hook claw 5a and the claw hook 5c are inserted in the central portion, and descends from both sides of the hook base position height of the hook claw 5a in the middle of the vertical groove 45. It is formed by the lateral grooves 46 and 46 formed in an inclined shape. Thereby, like the conventional one, the rubber piece adhering to the bead 2a at the time of pulling out can be scraped and removed mainly by sliding contact with the edge by the lateral grooves 46, 46 of the jig groove 8a.

  The jig groove 8a is formed such that the height of the vertical groove 45 is not high enough to insert the hook claw 5a and the main body 5b as in the conventional case, and the hook claw 5a and the claw hook 5c are inserted. Therefore, the free end height of the jig piece 47 formed in a free end shape between the lower half portion of the vertical groove 45 and the horizontal grooves 46 and 46 can be reduced, and the pressing force during pulling can be reduced. The strength of the jig piece 47 can be increased. In addition, there is an advantage that the installation of a lid structure for closing the lower half of the vertical groove 45 so as to be openable and closable can be omitted as in the conventional case.

  In the die portion 7 configured as described above, the opening height of the vertical groove 45 is lowered and the jig pieces 47 and 47 are shortened, and the back of the mounting plate 36 at a position corresponding to the jig pieces 47 and 47 is located. It is supported by support pieces 39, 39 provided on the guide rail 37. As a result, the jig plate 8 can be reliably reinforced and supported by the support pieces 39, 39 with a simple structure against the pressing load of the jig plate 8 that is pressed by the bead 2a or the rubber tire 2 at the time of pulling out. The bead removal work that prevents the above can be performed smoothly over a long period of time.

  Further, a rubber waste discharge distance L is provided between the mounting plate 36 and the tip of the guide rail 37, and a discharge space K through which the rubber waste is discharged and dropped through the jig groove 8a can be easily formed.

  Further, it accelerates the discharging and dropping of the rubber scrap that is generated when the bead 2a is pulled out and is pulled from the jig groove 8a, prevents the pulling claw 5 and the jig groove 8a from staying in the small gap or clogging, and the pulling claw 5 is moved back and forth. Can be smooth.

  Further, the rubber scrap that has entered the guide groove 38 of the guide rail 37 from above is characterized in that it can be discharged into the discharge space K by the advancement of the extraction pawl 5.

  Note that the jig plate 8 can be directly supported by the support pieces 39, 39 in a state in which the mounting plate 36 is omitted and provided directly on the vertical frame 9c. In order to increase the overall strength, it is desirable to form a thick layer.

  Next, the advance / retreat operation mechanism 6 will be described with reference to FIGS. The advance / retreat operation mechanism 6 of the embodiment includes a drive motor 19, a screw part transmission mechanism 51 that is rotated from the drive motor 19 via a chain 50 so as to be forward / reverse and shiftable, and a ball nut 52 included in the screw part transmission mechanism 51. It is comprised from the screw shaft 31 etc. which are screwed together. The advance / retreat operation mechanism 6 includes claw position detecting means including the first to seventh position sensors 11, 12, 13, 14, 15, 16, 17 and the like, and various operation switches, and the operation panel 10 and the control panel 10a. Driven through.

  As shown in FIG. 2, the screw portion transmission mechanism 51 rotatably supports a cylindrical shaft support portion 55 in a transmission case 53 that is detachably attached and fixed to the middle portion of the horizontal frame 9a. A configuration is such that the left end of a ball nut 52 formed in a cylindrical shape can be detachably mounted and fixed to a flange tube 56 formed on the right end side of the shaft support portion 55 by mounting means such as screwing or bolting. .

  As the ball nut 52, a ball screw unit similar to a commercially available one can be used. That is, the ball nut 52 in the illustrated example has a screw groove that is paired with a screw groove formed on the screw shaft 31 having an outer diameter of about 80 mm on the inner peripheral surface of the cylinder, and a plurality of balls are placed in both screw grooves. It is configured to be held in a screwed state in which it is inserted and filled.

  Further, a flange-shaped flange portion 56a is formed on the outer periphery of the flange cylinder 56 of the shaft support portion 55, and a ring-shaped driven sprocket 57 having a large diameter is fitted and fixed to the flange portion 56a. A chain 50 is stretched between the driven sprocket 57 and the drive sprocket 59 of the drive motor 19. Note that the drive motor 19 of the embodiment employs a gear motor that drives the drive sprocket 59 from the motor rotor via a reduction rotation mechanism, and performs an increase / decrease operation by an inverter (not shown).

  Therefore, the advancing / retreating mechanism 6 having the ball nut 52 can efficiently transmit the forward / reverse rotational power from the drive motor 19 through a plurality of balls with a small resistance, and can move the screw shaft 31 back and forth. Further, when the rotation of the drive motor 19 based on the load control command set in the control device in the control panel 10a is interrupted, when the screw shaft 31 is pulled in the advancing / retreating direction by the deformation restoring force of the tire, the above-described ball and screw lead angle are used. The ball nut 52 is also driven in reverse.

  At this time, either a mechanism in which the drive motor 19 is reversed or a mechanism in which only the ball nut 52 is reversed may be employed.

  As shown in FIG. 1, the screw shaft 31 has an intermediate support structure that is fitted into the shaft support portion 55 of the screw portion transmission mechanism 51 and screwed into the ball nut 52, and the left end of the screw shaft 31 is pulled out via the mounting shaft 30. The shaft end support portion is configured such that a sensor piece 60 made of a sensor operating contact piece and a support piece 62 having a guide support roller 61 are attached and fixed to the right end.

  The roller 61 is fitted and fixed to a guide rail (guide groove) 63 that is attached and fixed to the upper surface of the horizontal frame 9a with the operation stroke length of the extraction claw 5 and has a U-shaped cross section in a side view so as to be able to make rolling contact. .

  Further, the support piece 62 can be brought into contact with a stopper 65 erected on the horizontal frame 9a on the stroke end side, and the same function as the stopper 41 can be achieved.

  The screw shaft 31 for moving the extraction claw 5 forward / backward through the advance / retreat operation mechanism 6 with the above configuration can advance / retreat the sensor piece 60 in the same manner as the extraction claw 5, and the sensor piece 60 can move the position sensors 11, 12, 13. 14, 14, 15, 16, and 17, the position of the extraction claw 5 can be detected, and the rotation of the drive motor 19 can be controlled by this detection signal.

  Note that the second position sensor 12 and the sixth position sensor 16 are turned on in contact with the sensor piece 60 on the stroke end side of the extraction claw 5, and the drive motor 19 can be controlled to rotate at a reduced speed. The position of each position sensor can be adjusted, and the position sensor can be of a non-contact type such as a photoelectric type or a magnetic type.

  Next, the lifter device (tire support portion) 3 will be briefly described with reference to FIGS. In the lifter device 3, a tire platform 70 on which a rubber tire 2 is placed is supported at a lower front side of the tire bead removing device 1 by a hydraulic lift cylinder 71 provided on the body frame 9 so as to be movable up and down. In addition, a lifter frame 73 having a guide rod 72 that prevents the rubber tire 2 to be raised and lowered from being tilted is provided upright.

  As shown in FIG. 3, the tire mounting base 70 according to the embodiment can stably mount the rubber tire 2 having a large outer diameter of about 900 to 1200 mm on a tire mounting portion 75 that is recessed and formed in the central portion. it can. Further, the tire mounting table 70 can be detachably set on the tire mounting portion 75 with an auxiliary tire mounting table 76 that can stably mount the small-diameter rubber tire 2 having an outer diameter of about 900 mm or less. I have to.

  The lifter device 3 configured as described above has the rubber tire 2 placed on the tire mounting base 70 or the auxiliary tire mounting base 76 so that it rises, faces the tire hole in front of the jig groove 8a of the jig plate 8, and pulls out. In the position indicated by the solid line in FIG. 4 protruding from the jig groove 8a or the dotted lines A and B in FIG. 1, the rim portions on both sides of the rubber tire 2 are alternatively mounted on the claw hook 5c by the lowering operation. It can be set in a tire set state where it is placed and supported. After that, the tire mounting table 70 can be moved back to the next tire mounting standby position by the lowering operation of the lifting cylinder 71.

  The series of operations described above can be performed by automatic operation and manual operation in cooperation with the operation of the bead removal operation of the tire bead removal device 1.

  In the tire bead removing device 1 configured as described above, the lifter device 3 and the drive motor 19 are operated by a predetermined switch operation, and the rubber tire 2 is supported by the pulling claw 5 protruding from the jig plate 8. , The pulling claw 5 is retracted through the screw shaft 31 due to the reverse rotation of the drive motor 19, so that the hook claw 5a breaks the rim portion and locks the bead 2a inside, and is pulled into the jig groove 8a. The rubber tire 2 can be lifted and slid along the jig plate 8 while being deformed, and the ring-shaped beads 2a can be sequentially pulled out from the entire circumference of the rim portion.

  In the above bead removing operation, the bead 2a requires a large pulling force especially during the middle of the pulling from the initial pulling to the completion due to the difference in pulling resistance due to adhesive force, rust generation and boundary deterioration around the entire circumference of the rubber tire 2. Thus, a large load is generated in the drive motor 19. At this time, when a load greater than a set value applied to the drive motor 19 is detected by a load sensor (not shown) or the like, the rotational drive of the drive motor 19 is stopped by a command from the control device in the operation panel 10. As a result, the pulling claw 5 is stopped on the spot, the load of the drive motor 19 is released, and the bead 2a is also loosened by the load caused by the tension to prevent bead cutting.

  As shown in FIG. 2, the bead 2a locked to the hook claw 5a of the extraction claw 5 is pulled by the elastic restoring force after deformation of the rubber tire 2 itself, so that the extraction claw 5 and the screw shaft 31 are pulled. Try to move in the forward direction. This forward force causes the screw shaft 31 to normally rotate (reverse) the ball nut 52 as described above, so that the extraction pawl 5 is in a free state in which the load in the backward direction is released and temporarily moved forward to a predetermined position. be able to. The forward stroke amount is about 100 to 200 mm, and is due to the elastic restoring force of the rubber tire, so that the hook claw 5a of the bead 2a does not come off due to the advancement of the extraction claw 5. Next, when the reverse rotation of the drive motor 19 is automatically resumed by the control device based on the release of the load, the pulling claw 5 moves backward, and the bead removal work of the rubber tire 2 whose deformation has been repaired or corrected is continued again. Due to the weak adhesion of rubber, the bead is pulled out to the end without cutting.

  Next, when the bead removing operation of the first rim portion of the rubber tire 2 is completed, the reset operation of the rubber tire 2 is performed by the lifter device 3 and the bead removing operation is performed on the second rim portion of the rubber tire 2 that is set and supported. This is done by 5 forwards and backwards.

  Then, the rubber tire 2 in which the bead removing operation of the second rim portion has been completed is received and supported by the tire mount 70 of the lifter device 3, descends, is taken out to the ground side, and is recycled next to the removed bead 2 a. Moved to the process.

  As described above, according to the present invention, when the hook claw 5a of the extraction claw 5 moved forward via the advance / retreat operation mechanism 6 by the forward rotation of the drive motor 19 is pulled backward by the bead 2a by reverse rotation, a predetermined value or more is reached. Since the rotation of the drive motor 19 is interrupted by the pulling load, the ball nut 52 can be easily reversed via the bead 2a and the screw shaft 31 by the restoring force of the elastically deformed rubber tire 2. At this time, if the drive motor 19 is temporarily controlled to rotate forward, the advancement of the extraction pawl 5 can be effectively assisted, or the advancement of the screw shaft 31 to a predetermined position (bead locking position) itself. A configuration in which the drive motor 19 is used is also possible.

  And since the bead 2a is loosened by advancing the extraction claw 5 temporarily, as shown in FIG. 2, both sides of the bead 2a of the bead 2a which is locked by the hook claw 5a at the time of extraction and has a substantially triangular shape with the rubber tire 2 in plan view. The drawing posture is corrected so that different tensions are equalized, and the drawing balance of the bead 2a at the time of redrawing can be improved and cutting can be prevented.

  In addition, when the bead 2a is temporarily loosened, when the rubber tire 2 deformed into an irregular shape is restored by its own elasticity, the rubber and the bead 2a are displaced in the rubber tire 2 to promote rubber peeling. Further, it is possible to reduce the adhesion of rubber and rubber scraps during re-drawing, facilitate the scraping of the rubber in the jig groove 8a, and reduce the wear of the jig plate 8.

  When the drive motor 19 reverses again and the extraction claw 5 moves backward, the pull-out resistance of the bead 2a is reduced. Therefore, the small horsepower of the drive motor 19 is reduced by the simple advancing / retracting mechanism 6 having the ball screw drive structure. The inexpensive tire bead removing device 1 can be downsized and the bead removing operation can be easily controlled, and the bead removing operation can be performed efficiently and easily.

  In addition, the bead 2a after the bead removal work has less rubber adhesion and prevents the bead wire from being cut, and the rubber tire 2 prevents the excessive pulling and the bead 2a is pulled out, thereby preventing significant breakage and deformation. Therefore, there is an advantage that the subsequent recycling process can be easily performed at low cost.

In the above embodiment, when the extraction pawl 5 is stopped while the bead extraction is in progress and driven forward in the reverse direction, the elastic restoring force of the elastically deformed rubber tire 2 is used as a power source for the forward drive. As described above, the ball nut 52 may be reversely driven after the extraction pawl 5 is stopped as described above to operate the screw shaft 31 to a predetermined position in the forward direction. The drive motor 19 at this time
The forward stop command means may be a sensor such as a limit switch, a timer (both not shown), etc., which are provided exclusively.

Next, the tire bead removing device 1 including the advance / retreat operation mechanism 6 according to the second embodiment will be described with reference to FIGS. In addition, description is abbreviate | omitted about the structure and effect | action similar to the thing of the said embodiment.
The advancing / retracting operation mechanism 6 includes an operating rod 79 for attaching the pulling claw 5 to a mounting bracket 30a provided at the tip via the mounting shaft 30, a chain 77 provided detachably along the side surface of the operating rod 79, and the chain The drive motor 19 and the like having a sprocket 59 meshing with 77.

  In the illustrated example, the actuating rod 79 is a square bar having a substantially rectangular section having the same length as that of the screw shaft 31. Chains 77 and 77 having forward and backward operation stroke lengths on both the left and right sides are attached so as to be detachable and tension adjustable. I support it. That is, the chain 77 has a chain link at the front end attached to an operating piece 79 to a mounting piece 82 that is detachably attached and fixed to the operating rod 79 via a mounting screw 81, and a chain tension adjusting mechanism 85 at the rear end. The adjustment mounting piece 86 is attached via a chain pin 83.

  The chain tension adjusting mechanism 85 has an adjustment screw 89 provided on the left and right adjustment mounting pieces 86 inserted on both sides of a mounting seat 87 provided on the right end (rear end) of the operating rod 79 and screwed into the adjustment screw 89. The chain tension adjustment is performed by the nuts 91 and 92 to be adjusted.

  Further, a chain groove 93 is formed on both side surfaces of the operating rod 79, and a chain 77 is stretched in the chain groove 93 so that the upper and lower chain links are fitted to each other to be supported by the mounting piece 82 and the adjustment mounting piece 86. The middle part of the chain 77 is positioned.

  Further, the heavy operating rod 79 having the chain 77 is supported in a substantially horizontal posture by the front and rear rollers 95, 95 provided on the horizontal frame 9a in the last retracted position, and a standby position for bead removal work as it moves forward. When reaching C, it is supported by the guide rail 37 and the front roller 95 via the extraction pawl 5 so that the full stroke can be smoothly advanced and retracted.

  The end of the operating rod 79 is provided with a sensor piece 60 similar to that of the above embodiment, and the position sensors 11, 12, 13, 14, 15, 16 for detecting the first to seventh positions of the extraction pawl 5 are provided. , 17, etc., in conjunction with claw position detection means, the drive motor 19 of the advance / retreat operation mechanism 6 is rotationally controlled, and the extraction claw 5 is advanced / retracted so as to stop at the forward / reverse position set according to the tire size to be processed. Can be made.

  Then, a pair of sprockets 59 are engaged with the front portions of the chains 77 and 77 stretched around the operating rod 79 so as to face each other at the same position in plan view. At this time, the paired drive motors 19 having the same specifications with the sprocket 59 are arranged in an upward posture and a downward posture with respect to the body frame 9, and the meshing position of the chain 77 and the sprocket 59 is mounted and fixed in an adjustable manner by the mounting base structure. Is done.

  The drive motor 19 is a gear motor that is driven from the motor rotor via the speed reduction rotation mechanism and omits the braking mechanism, and can rotate the sprocket 59 in forward and reverse speeds. Further, as described above, in the rotation stopped state, the pull-out pawl 5 can be allowed to advance by the reverse rotation allowance mechanism that reversely rotates the sprocket 59 by the deformation restoring force of the elastically deformed rubber tire 2.

  In the tire bead removal device 1 including the advance / retreat operation mechanism 6 configured as described above, when the drive motors 19 and 19 are rotated forward by the operation on the operation panel 10 side, the paired sprockets 59 and 59 are the chains 77 and 77. The operating rod 79 is moved forward through the meshing. Next, when the extraction claw 5 retracts by pulling the bead 2a due to the reverse rotation of the drive motors 19, 19, if the rotation of the drive motor 19 is interrupted by an extraction load exceeding a certain value, at least the extraction claw 5 is stopped after the drive motor 19 stops. The pulling claw 5 can be moved forward by reversing the sprocket 59 by the deformation restoring force of the rubber tire when the bead is pulled through the reverse rotation allowing mechanism that allows the forward drive.

  As a result, the bead 2a, which is locked by the hook claw 5a at the time of pulling out and forms a substantially triangular shape with the rubber tire 2 in a plan view, has the pulling posture corrected so that the tensions on both sides are equal, and the pulling balance is improved at the time of pulling out again. Drawing can be performed while preventing cutting. At this time, the operating rod 79 receives a lateral load when the pulling posture is corrected. However, the sprockets 59, 59 meshed with the chains 77, 77 from both sides restrict the deflection of the operating rod 79 and Since it is simultaneously driven with the same force and direction while being clamped from both sides, the extraction claw 5 can be smoothly advanced and retracted.

  Furthermore, the advance / retreat operating mechanism 6 according to this embodiment can drive the operating rod 79 from the left and right in a balanced manner by the engagement of the chain 77 and the sprocket 59 on both sides. Accordingly, it is possible to reduce the horsepower and the size of the pair of drive motors 19 and to make the tire bead removing device 1 easy to perform a series of control of the bead removing operation.

  Further, since the advance / retreat operation mechanism 6 is provided with a chain 77 detachably along the side surface of the operating rod 79, the operation rod 79 does not require complicated and expensive rack gear and pinion gear processing, and is generally available on the commercially available chain 77. It is possible to make the structure simple and inexpensive by simply stretching the mesh and engaging the sprocket 59. The advancing / retracting mechanism 6 according to this system has a feature that noise generation can be remarkably reduced and a quiet operation can be performed, compared to a mechanism for advancing / retreating the screw shaft 31.

  Further, since the chain 77 is driven by being stretched linearly along the operating rod 79, the chain 77 is unlikely to be stretched. However, when the chain 77 is stretched during long-term use, the chain tension adjustment is performed. Since the mechanism 85 is provided, the chain can be tensioned quickly by adjusting the adjusting screw 89, and high-accuracy driving can be performed. Further, when the worn chain 77 is replaced, the chain 77 can be easily replaced with a new chain 77 simply by releasing the fixing of both ends of the chain without removing the long and heavy operating rod 79. There are advantages such as being able to.

  The advancing / retracting mechanism 6 that engages a sprocket 59 that rotates forward / reversely by the drive motor 19 with a chain 77 provided along the operating rod 79 is used for reciprocating the extraction claw 5 as shown in the drawing. Without being limited thereto, for example, the present invention can be effectively used for a reciprocating mechanism used in various press working machines, a long stroke type conveying device that supports and conveys an arbitrary object, and the like.

1 is an overall side view of a tire bead removing device according to the present invention. It is an effect | action top view which shows the structure of the principal part of FIG. It is a left view which abbreviate | omits and partially shows the lifter apparatus of FIG. It is a front view which shows the structure of a die part, a drawing nail, etc. partially broken. It is a front view which shows the shape of a jig | tool board. It is a back sectional view showing composition of an extraction claw and a guide rail. It is a whole side view of a tire bead removal device provided with the advance and retreat operation mechanism of a 2nd embodiment concerning the present invention. It is a side view which expands and shows the structure of the principal part of the advance / retreat operation mechanism of FIG. It is a top view of FIG. It is a back sectional view showing composition of an advance and retreat operation mechanism and a guide rail.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire bead removal apparatus 2 Rubber tire 2a Bead 3 Lifter apparatus (tire support part)
5 Pull-out claw 5a Hook claw 5b Main body part 5c Claw hook 6 Advance / retract operating mechanism 7 Die part 8 Jig plate 8a Jig groove 9 Machine frame 10 Operation panel 10a Control panel 19 Drive motor 31 Screw shaft 52 Ball nut 37 Guide rail 39 Support Fragment 59 Sprocket 77 Chain 79 Actuation rod 85 Chain tension adjustment mechanism K Discharge space

Claims (9)

  A pull-out claw (5) in which a bead (2a) of a rubber tire (2) fixedly supported with respect to the machine body frame (9) is moved forward and backward by an advance / retreat operation mechanism (6) provided on the machine body frame (9). In the bead removal method in which the bead (2a) is pulled out by moving the pull-out claw (5) forward and backward, the pull-out claw (5) is stopped in the course of the drawing operation after the drawing operation is started, and the bead drawing is performed. A tire that pulls out the bead (2a) by moving the pulling claw (5) forward to a predetermined position in a direction to restore the shape of the rubber tire (2) that has been elastically deformed in the process, and then moving backward again after stopping the forward movement. Bead removal method.   2. The tire bead removal method according to claim 1, wherein when the drawing claw (5) is stopped in the middle of the drawing, it is detected and stopped when the bead drawing load has reached a preset value.   When the withdrawal pawl (5) is stopped during the bead withdrawal process and driven forward in the reverse direction, the withdrawal pawl (using the elastic restoring force of the elastically deformed rubber tire (2) as a power source for the forward drive is used. The tire bead removing method according to claim 1 or 2, wherein 5) is driven forward.   A tire support portion (3) for holding the rubber tire (2) in a predetermined posture, a pulling claw (5) for engaging and pulling out the bead (2a) of the rubber tire (2), and advancing and retracting the pulling claw (5) In the device provided with the advancing / retreating operation mechanism (6) to be driven, the advancing / retreating operation mechanism (6) includes a screw shaft (31) for attaching the extraction claw (5) to the tip, and the screw shaft (31) by rotational driving. A tire bead removing device comprising a ball nut (52) that is driven forward and backward.   A tire support portion (3) for holding the rubber tire (2) in a predetermined posture, a pulling claw (5) for engaging and pulling out the bead (2a) of the rubber tire (2), and advancing and retracting the pulling claw (5) In the device provided with the advance / retreat operation mechanism (6) to be driven, the advance / retreat operation mechanism (6) has an extraction hook (5) at the tip and an operation rod (79) provided with a chain (77) along the side surface. And a sprocket (59) that meshes with the chain (77) and drives the operating rod (79) to advance and retreat by rotational driving.   The tire bead removing device according to claim 5, wherein the chain (77) is detachably stretched along both sides of the operating rod (79), and the sprockets (59) on both sides are arranged to face each other.   A motor (19) that drives the advance / retreat operation mechanism (6) to move forward / backward is provided, and a detection device that detects that the bead pull-out load has reached a preset setting value, and a motor ( The tire bead removing device according to claim 4, 5 or 6, further comprising a stopping device for stopping 19).   7. The tire bead removing device according to claim 6, further comprising at least a pull-out pawl (reverse rotation allowing mechanism for allowing the forward drive of 5) after the motor (19) is stopped.   9. The tire bead removing device according to claim 4, further comprising a control device for driving the pulling claw (5) forward by driving the motor (19) in a reverse direction after stopping the motor (19).

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