JPH0735111U - Detachment device for industrial vehicle tires - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a tire attaching / detaching device with good workability, which does not require lifting of a tow bolt for pulling down an attachment by hand or removing a nut attached to the upper end of the tow bolt. [Structure] A hydraulic cylinder is provided below the table, and the piston rod of the hydraulic cylinder is projected upward and downward so that the piston rod has a traction bolt inside and is hydraulically expanded and contracted. It is equipped with a base on which to mount the tire, and an attachment for pressing the tire and the like, and the attachment is pulled down by a tow bolt to press the tire.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tire attaching / detaching device for an industrial vehicle.

[0002]

[Prior art]

 Among industrial vehicles such as forklifts, tires that do not contain air are used because the vehicle weight is extremely large. That is, the tire is a large ring made of rubber and is mounted on a wheel having a predetermined diameter. Such a tire wears on the wheel more than general vehicle tires. Not easy to take off. That is, since the tire adheres to the wheel due to the effect of the weight of the vehicle, a large press device has been conventionally used to release the adhesion.

FIG. 6 shows a state in which the tire 1 is mounted on a wheel 2. The wheel 2 has a rim 4 having an ear 3 formed on only one side on the outer circumference, and the wheel 2 is provided on the side opposite to the ear 3. The side ring 5 is fixed by the lock ring 6 to prevent the mounted tire 1 from coming off. In order to separate the tire 1 mounted in this way and completely fixed on the contact surface with the rim 4 from the wheel 2, in a state in which the wheel base 2 is held at a constant height by mounting the base 7 on the ear portion, A large force P is applied to the side surface of the tire 1, that is, the side ring 5 to press the tire 1 to provide a gap between the side ring 5 and the lock ring 6 to release the sticking with the side ring 5, and in that state. Remove the lock ring 6.

However, since the tire 1 is still attached to the rim 4, the wheel 2 is turned upside down and the side surface of the tire 1 is pressed again to separate the tire 1 from the wheel 2. By the way, the tire 1 is a completely solid body as described above, the pressing force is very high, and depending on the tire size, a pressing force of several tens of tons is required. Also, the press device that can generate the above-mentioned problem becomes large in size.

Of course, it is possible to attach and detach the tire using a general-purpose general-purpose press, but in the general-purpose press, the entire device becomes large, and there are guide posts and the like in the periphery, and the table surface is high. Tire workability and other workability are poor. Therefore, a dedicated device for the purpose of attaching and detaching tires for industrial vehicles has been developed. "Tire attachment / detachment device" according to Jitsuhei 4-3 6961 is one of the dedicated devices.

This device is provided with a hydraulic cylinder in the base body, a set screw rod that is attached to the piston of the hydraulic cylinder in a retractable and lockable manner, and a wheel is supported on the mounting reference surface of the base body. It has a support ring and a detachable ring that is locked to the end of the set screw rod to pressurize the tire.It is configured to apply a pressing force to the mounting reference surface to attach and detach the tire and the wheel. ing.

Therefore, the piston of the hydraulic cylinder is lowered, the supporting ring is placed on the mounting reference surface, the wheel is arranged on the supporting ring, and the piston is lifted to a certain height to lift the set screw. Lock the set screw so that it does not fall. Then, the set screw is inserted into the center hole of the attachment / detachment ring to mount the attachment / detachment ring on the tire, and the nut is screwed onto the upper end of the set screw. If the piston is lowered in this state, the nut will hit the attachment / detachment ring and press the tire to remove it. As described above, in the conventional tire attaching / detaching device, the work of lifting the set screw and the work of arranging the attach / detach ring through the central hole of the set screw that is highly protruding are labor intensive and workability is not good at all.

[0008]

[Problems to be solved by the present invention]

 As described above, the conventional tire attaching / detaching device has the above-mentioned problems. The problems to be solved by the present invention are these problems, and provide a device for attaching and detaching tires for industrial vehicles, which has good workability and does not require heavy labor.

[0009]

[MEANS FOR SOLVING THE PROBLEMS] The industrial vehicle tire attaching / detaching device of the present invention has a basic structure similar to that of the conventional device. That is, a hydraulic cylinder is formed below the table (placement reference plane), a piston rod extends upward from a piston that moves up and down in the hydraulic cylinder, and the piston rod also functions as another cylinder. A pulling bolt is slidably installed inside the rod. The hydraulic oil for moving the piston and the traction bolt up and down is common, and if the hydraulic oil is supplied to the hydraulic cylinder, the piston, the piston rod, and the traction bolt move up and down. The protruding length of the traction bolt can be made large due to the double structure built in the piston rod. As a result, the height of the hydraulic cylinder is reduced, and it is convenient to attach and detach the tire to and from the table. There are hydraulic oil inlets above and below the hydraulic cylinder. The hydraulic oil flowing from the lower inlet raises the piston rod and index bolt, and the hydraulic oil entering from the upper inlet lowers the piston rod and index bolt. The side surface of the piston rod has an inflow hole for the hydraulic oil in the cylinder chamber to flow into the cavity of the piston rod. Moreover, the lower end of the piston rod is open.

The table has a base for supporting the wheels, and an attachment for pressing the tire with the wheels placed on the base. A large through hole is formed in the center of the attachment, and the through hole has such a size that a lock nut can be screwed onto the upper end of the pulling bolt and a spacer is interposed between the lock nut and the attachment. The spacer is formed with an open groove having a width into which the traction bolt can be fitted. Here, the base for supporting the wheel may be either an integral type that can be replaced according to the size of the wheel or a divided type that can adjust the position according to the wheel diameter.

By the way, when the tire is removed from the wheel, the wheel is placed on the stand, the attachment is placed on the tire, the piston rod and the traction bolt are raised to project onto the attachment, and the spacer is attached to the lock nut and the attachment member. Insert between the two. If the piston rod is lowered in this state, the tow bolt will be pulled down to push down the attachment, which in turn removes the tire from the wheel. Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

[0012]

【Example】

 FIG. 1 is an external view of a tire attaching / detaching device for an industrial vehicle according to the present invention, and the tire attaching / detaching device includes a crane. Of course, the crane is used for setting and removing tires and wheels on the tire attaching / detaching device, and is not directly related to the tire attaching / detaching device of the present invention, and thus may not include the crane.

FIG. 2 shows an embodiment of a tire attaching / detaching device according to the present invention, in which 11 is a table, 12 is a hydraulic cylinder, 13 is a piston, 14 is a piston rod, 15 is a traction bolt, and 16 is an attachment. As shown in the figure, a large hydraulic cylinder 12 is formed below the table 11 as a base. Of course, legs or bases for supporting the table 11 may be provided separately, but in the present embodiment, the hydraulic cylinder 12 itself forms the support of the table 11, and the piston in the hydraulic cylinder 12 is Reference numeral 13 slides in the hydraulic cylinder 12 in the upward and downward directions, and a piston rod 14 is connected to the piston 13.

The hydraulic cylinder 12 has cylinder chambers 17 and 18 formed above and below the piston 13 as a boundary. By applying hydraulic pressure to the cylinder chambers 17 and 18, respectively, the piston rod 14 is moved upward and downward. Move down. Further, a hollow is formed in the longitudinal direction in the central axis portion of the piston rod 14, and the traction bolt 15 is installed in the hollow. The tow bolt 15 can extend and contract in conjunction with the piston rod 14.

FIG. 3 shows the details of the hydraulic cylinder 12. The hydraulic cylinder 12 has a cavity 19 formed inside the piston rod 14, and the cavity 19 is provided with the traction bolt 15 therein. It is possible to move up and down. That is, the piston rod 14 constitutes another hydraulic cylinder, and the traction bolt 15 functions as another piston rod. Therefore, the hydraulic fluid that has flowed into the lower inlet 20 of the hydraulic cylinder 12 flows into the piston rod 14, and as a result, the traction bolt 15 projects upward. Since the cavity 19 formed in the piston rod 14 has an opening 27 at its lower end and is continuous with the cylinder chamber 18 of the hydraulic cylinder 12, the hydraulic oil flows into the cavity 19 from the opening 27. Therefore, the index bolt 15 projects upward.

By the way, if hydraulic oil is supplied to the hydraulic cylinder 12, the piston 13 rises and the piston rod 14 also projects upward, but when the traction bolt 15 projects and reaches the top dead center, the piston 13 rises. Of course, this may be reversed due to sliding friction. 3 shows a state in which both the piston 13 and the index bolt 15 are at the bottom dead center, and FIG. 4 shows a state in which the piston 13 and the index bolt 15 are at the top dead center. To lower the piston rod 14 and the index bolt 15 protruding upward, hydraulic oil is introduced from the upper inlet 25. The hydraulic oil flowing from the upper inlet 25 enters the cylinder chamber 17, and the hydraulic oil is It enters into the cavity 19 through an inflow hole 26 formed in the side surface of the piston rod 14. Therefore, the index bolt 15 is pulled down, and at the same time, the piston rod 14 is pulled down.

FIG. 2 shows a work process of removing the side ring 5 of the wheel 2. The wheel 2 having the tire 1 mounted thereon is placed on a table 7 arranged on a table 11, and an attachment is made on the side ring 5. 16 is mounted. Then, the traction bolt 15 protrudes through the central hole 28 of the attachment 16, the lock nut 22 is screwed onto the upper end of the traction bolt 15, and the spacer 21 is interposed between the lock nut 22 and the attachment 16. ing. Since the lock nut 22 can pass through the central hole 28 of the attachment 16, the traction bolt 15 is projected while the attachment 16 is mounted on the side ring 5, and the lock nut 22 is positioned above the attachment 16. The roughly U-shaped spacer 21 is then placed.

Since the spacer 21 cannot pass through the central hole 28, when the pulling bolt 15 is pulled down, the attachment 16 presses the side ring 5. Since the side ring 5 is fixed to one side of the rim 4 through the lock ring 6, the side ring 5 is pressed to remove the lock ring 6 while leaving a gap between the side ring 5 and the lock ring 6. Since the window 23 is formed on the side portion of the attachment 16, the lock ring 6 is removed by inserting a lever or the like through the window 23.

FIG. 5 shows a state in which the lock ring 6 is removed from the wheel 2, the tire 1 is turned upside down, and the tire side surface is directly pressed to separate the tire 1 from the wheel 2. In this case, the wheel 2 is higher than the platform 7 and is mounted on the platform 24 which supports the flange 8 of the wheel 2 and presses the tire 1. Therefore, the tire 1 is taken out from the wheel 2 together with the side ring 5 that is in close contact with the tire 1. On the contrary, when the tire 1 is mounted on the wheel 2, it is sufficient to carry out the above-mentioned working steps in the reverse order, and the description thereof will be omitted.

The attachment 16 is pulled down by the traction bolt 15, which is done by lowering the piston rod 14 of the cylinder 12, in which case the traction bolt 15 is located at the top dead center of the piston rod 14. ing. When the lock ring 6 is removed and the tire 1 is removed from the wheel 2, the index bolt 15 again rises to remove the spacer 21, and the lock nut 22 is still attached to the central hole of the attachment 16. Descend from. On the other hand, the wheel 2 is supported by the bases 7 and 24, and therefore, it is necessary to prepare a base of a plurality of sizes according to the wheel size. It can also be configured as follows.

As described above, the industrial vehicle tire attaching / detaching device according to the present invention is provided with the hydraulic cylinder below the table, and the piston rod is extended upward from the piston that slides the hydraulic cylinder up and down. The piston rod is equipped with a traction bolt to move it up and down by hydraulic pressure, a table is provided with a table on which the wheel is placed, and an attachment for pressing the tire is provided. It is configured as described above, and the following effects can be obtained.

[0022]

[Effect of device]

 In the tire attaching / detaching device of the present invention, since the traction bolt moves up and down by hydraulic pressure, it is not necessary to manually lift and set the heavy traction bolt. It is not easy to lift the tow bolt with the attachment set, and it is troublesome to pull up the tow bolt and then set the attachment.In the present invention, the tow bolt is hydraulically driven. Can solve the problem. That is, the work preparation is completed by projecting the tow bolt with the attachment set at a predetermined position, projecting with the lock nut still screwed, passing through the central hole of the attachment, and inserting the spacer. Usually, the piston rod and the index bolt descend and only slightly project from the table surface, and the piston rod and the index bolt do not interfere.

[Brief description of drawings]

FIG. 1 is an overall external view of a tire attaching / detaching device.

FIG. 2 is an embodiment showing a device for attaching and detaching a tire for an industrial vehicle according to the present invention.

FIG. 3 is a sectional view of a cylinder and a piston rod, showing a state in which the piston rod and the index bolt are located at the bottom dead center.

FIG. 4 shows a state where a piston rod and an index bolt are projected.

FIG. 5 is a process of removing a tire from a wheel.

FIG. 6 shows a state in which a tire for an industrial vehicle is mounted on a wheel.

[Explanation of symbols]

 1 Tire 2 Wheel 3 Ear 4 Rim 5 Side Ring 6 Lock Ring 7 Units 8 Flange 11 Table 12 Hydraulic Cylinder 13 Piston 14 Piston Rod 15 Traction Bolt 16 Attachment 17 Cylinder Chamber 18 Cylinder Chamber 19 Cavity 20 Lower Inlet 21 Spacer 22 Lock Nut 23 24 windows 25 upper entrance 26 inflow hole 27 opening 28 center hole

Claims (1)

[Scope of utility model registration request] 1. A hydraulic cylinder is provided below the table, a piston rod extends upward from a piston sliding in the hydraulic cylinder, and a traction bolt is installed in the piston rod to enable upward and downward movement. A device for mounting a wheel on the top and an attachment for pressing a tire or a side ring, and pushing down the attachment by pulling down the tow bolt to attach and detach the tire, in the piston rod The cavities formed in the cylinder are used as a cylinder to accommodate the traction bolt so that the traction bolt can be moved up and down.The lower end of the piston rod opens to communicate with the cylinder chamber of the hydraulic cylinder. Communicating with the cavity,
The hydraulic cylinder is provided with a lower inlet through which hydraulic oil flows in to project the piston rod and index bolt, and an upper inlet through which hydraulic oil flows in to lower the piston rod and index bolt. A central hole through which a lock nut screwed together is formed at the upper end of the bolt, and a roughly U-shaped spacer having a groove that opens on one side is interposed between the lock nut and the attachment. Detachable device.