JPH049159Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a tire uniformity machine for inspecting the uniformity of manufactured tires. The present invention relates to the provision of new and improved means for hydraulic drive for reliable chucking against resistance.

(Prior art) In a tire uniformity machine that inspects the uniformity of manufactured tires, as is known, the test tire is reliably chucked between the upper and lower rims against the internal pressure of the same tire, and this is used as a substitute. This method is used to contact and rotate the circumferential side of a rotary drum equipped with a load cell, which is used as a road surface, to perform various checks on its uniformity.The outline of the prior art related to this is explained below with reference to FIGS. 4 to 6. do. In FIGS. 4 and 5, the tested tire 3 has an upper rim 4 attached to the upper rotating shaft 6 via an adapter 22, and a lower rim 1 attached to the lower rotating shaft 12.
By pressing the circumferential side of a rotating drum 16 equipped with a load cell used as a substitute road surface against the circumferential side of the tire 3, the tire 3 filled with internal pressure can be used for actual running. By rotating it under the same conditions as above, the symmetry during rotation is checked.In addition, the lower rim 4,
In step 11, it is necessary to apply a force against the internal pressure of the tire to reliably chuck the tire. To further explain the above structure, as shown in Figure 5,
The upper rotating shaft 6 is mounted on a frame 17 with upper and lower bearings 19,
The upper rim 4 is attached to the lower end of the rotating shaft 6, while the lower rotating shaft 12 is mounted on the housing 30 with upper and lower bearings 33, 34.
The lower rim 11 is attached to the upper end of the rotating shaft 12, and the housing 30
is held by a support 27 via spherical seats 29a and 29b, and the support 27 is connected to a piston rod 102 of a hydraulic cylinder 101 for lifting and chucking.
By being connected to the tip of the cylinder 1
01, the lower rim 11 can be opened and closed toward the upper rim 4 by raising and lowering the piston rod 102.

That is, as shown in FIG.
When the test tire 3 placed on top reaches the lower rim 11 located below the conveyor 1, the hydraulic cylinder 101 is driven, and the test tire 3 is moved onto the lower rim 11 through the rise of the piston rod. The tire 3 to be tested is received by the rim 4, moves straight toward the upper rim 4, and is sandwiched between the rims 4, 11 through the fitting of the centering taper parts 21, 35. this year tire 3
The upper and lower rims 4 and 11 are filled with pressurized air to create a tensioned state and provide conditions equivalent to actual driving.
In order to clamp the tire, it is necessary to reliably chuck it with a pressure load higher than the internal pressure of the tire. Conventionally, this has been done using a hydraulic cylinder 101 for lifting and chucking, and this is shown in Fig. 6 below. Explain about. On the piston 103 side of the hydraulic cylinder 101, there is a flow path that communicates with the tank 202 of the hydraulic power unit 201 and is equipped with a high-pressure small-flow pump 205 driven by a motor 203, relief valves 208, 209, and an electromagnetic directional control valve 207. a ₁ , a low-pressure large-flow pump 204 which is also connected to the tank 202 and driven by a motor 203 , and a flow path A ₂ equipped with an electromagnetic directional switching valve 206 are connected to a feed pipe A 2 , which is connected to the piston rod 102 side. , a return pipe B that communicates with the tank 202 and shares the electromagnetic directional control valve 206 is connected to the hydraulic power unit 201.
Hydraulic cylinder 1 for lifting and chucking
01 operates as follows. In Figure 6,
The piston 103 of the hydraulic cylinder 101 is at its lowering point, which is a so-called rest position, where the lower rim 11 is stopped below the conveyor 1 shown in FIG. During this pause, the solenoid 2A side of the electromagnetic directional switching valve 207 is energized, and the oil discharged from the high-pressure small-flow pump 205 is returned to the tank 202. Upper rim 4 of lower rim 11
In this case, the solenoid directional valve 2 should first be raised.
By energizing the solenoid 1A in 06 and the solenoid 2B of the electromagnetic directional control valve 207, the oil discharged from the low-pressure large-flow pump 204 and the high-pressure small-flow pump 205 is transferred to the flow paths a ₁ , a ₂ and the feed pipe A.
The combined material is supplied to the lower side of the piston 103 of the cylinder 101, thereby causing the piston 103 and the rod 102 to rise at high speed.
At this time, if the oil pressure exceeds the set value of 35 kg/cm ² , oil returns to the tank 202 from the relief valve 208 . Thus, the piston 103 and the rod 102
rises and approaches its upper limit, the limiter 105 attached to the tip of the arm 104 attached to the housing 30 operates the limit switch 106, and the solenoid 2B of the electromagnetic directional valve 207 is demagnetized by the signal from the switch 106. Then, the spool of the electromagnetic directional switching valve 207 returns to the center position, so the oil discharged from the high-pressure small-flow pump 205 is blocked by the switching valve 207 and directly flows into the lower side of the piston 103 of the hydraulic cylinder 101. death,
Piston 103 and rod 102 are further raised. As a result, when the centering taper part 35, which is the upper end of the lower rotating shaft 12, fits into the centering tapered part 21, which is the lower end of the adapter 22 attached to the upper rotating shaft 6, the upward movement is prevented from further. The oil pressure will rise, and the pressure value set at the relief valve 209, e.g.
Hydraulic pressure is increased until reaching 140Kg/cm ² .
As a result, the increased pressure causes the piston 103 to
Therefore, even if the tire 3 is filled with pressurized air, the upper and lower rims 4 and 11 can provide reliable and firm chucking.

According to this hydraulic system, high-speed lifting is possible by using low pressure and large flow rate from the lowering point to a position close to the rising point, and the feature is that high pressure and small flow rate is used for the final partial rise and crimping after the rise. , the hydraulic cylinder operation can be speeded up (accelerated) and efficient control operation can be obtained. In descending from the raised position, the piston 103 can be lowered by energizing the solenoid 1B of the electromagnetic directional switching valve 206 and energizing the solenoid 2A of the electromagnetic directional switching valve 207.

Further, in FIG. 6, 210 is a pressure switch;
211 is the oil cooler, 212 is the oil level switch,
213 indicates a temperature switch.

(Problems to be Solved by the Invention) The above-mentioned conventional technology is designed to prevent the upper and lower rims 4 and 1 from moving against the tire internal pressure in the tire uniformity machine.
1 has an excellent feature of reliably chucking the test tire 3, but on the other hand, it tends to complicate the structure of the hydraulic power unit used for hydraulic control, and the hydraulic equipment and circuits tend to become complicated. The configuration is troublesome, there are disadvantages in terms of maintenance, and the equipment tends to be expensive.

(Means for Solving the Problems) In order to solve the above problems, the present invention simplifies the structure, reduces the number of necessary parts, facilitates operation, and simplifies maintenance, making it compact and economical. Specifically, the test tire is sandwiched between the upper and lower rims that can be opened and closed, and the supply pressure is supplied to a hydraulic cylinder that supports the lower rim so that it can be raised and lowered toward the upper rim. Accordingly, in the tire chucking device against the internal pressure of the tire, a plunger cylinder and a piston cylinder are provided in series with different diameters on the piston side of the fluid pressure cylinder, and both cylinders are disposed in series. The plunger cylinder of a booster, in which a piston and a plunger accompanying the piston are movably installed, is interlocked, and a fluid pressure tank is communicated with the plunger cylinder. The object is to be able to supply operating fluid pressure to the upper part of the pressure tank and to the piston cylinder side of the booster via a switching valve.

(Function) According to the above-mentioned technical means of the present invention, as illustrated in FIG. In the lifting and chucking fluid pressure cylinder 101, which is equipped with a rod supporting the pistons 102 and 103, a plunger cylinder 308 and a piston cylinder 309 are formed in series on the piston 103 side of the cylinder 101, with different large and small diameters. , the plunger cylinder 30 in a booster 301 equipped with a plunger 307 and a piston 306 across both cylinders 308 and 309.
8 through piping 310, and the plunger cylinder 308 is connected to the fluid pressure tank 302.
Operating fluid pressure, such as air, is applied to the rod 102 side of the fluid pressure cylinder 101, the upper part of the fluid pressure tank 302, and the piston cylinder 309 side through electromagnetic directional control valves 303, 304 and through piping 311, 312, 313. By making it possible to supply
From the descending point position (rest position) of the piston 103 in the cylinder 101 shown in FIG. 1, the solenoid A of the electromagnetic directional control valve 303 is energized as shown in FIG. When the pressure medium such as oil in the tank 302 is fed under pressure to the upper part of the fluid pressure tank 302, the plunger 307 in the booster 301 is in the retracted position, and the plunger cylinder 308 and piping 31
0 and is rapidly supplied to the lower side of the piston 103, and as the piston 103 and rod 102 rise, the lower rim 11 moves forward with respect to the upper rim 4 at high speed. Therefore, when approaching the rising point, the kicker 105 activates the limit switch 106 to energize the solenoid B of the electromagnetic directional control valve 304, and as shown in FIG. By supplying working fluid pressure to the right side of the piston 306 in the cylinder 309,
Piston 306 and plunger 307 integrated with it
moves forward to the left in the figure, the plunger 307 enters the plunger cylinder 308, and the increased pressure medium is forced into the piston 103 side of the cylinder 101 due to the area ratio of the piston 306 and the plunger 307. The piston 103 is pushed up to the rising point, and the high pressure presses the tapered fitting part 35, which is the upper end of the upper rotating shaft 12, to the tapered fitting part 21, which is the lower end of the upper rotating shaft 6 on the adapter 22 side. By doing so, chucking against the tire internal pressure caused by the upper and lower rims 4 and 11 can be obtained.

When the piston 103 in the cylinder 101 is lowered, both the electromagnetic directional control valves 303 and 304 are demagnetized, and the piston 306 in the piston cylinder 309 of the booster 301 is connected to the rod 102 side of the cylinder 101 via the piping 311. The working fluid pressure is supplied to the left side through the piping 313 to lower the piston 103 and retract the piston 306 (the plunger 307 also accompanies the same).
The booster 301 and the fluid pressure tank 3
02, switching valves 303, 304, and simple piping 311, 312, 313, the same lifting and chucking fluid pressure cylinder 10 as the conventional one can be achieved.
1 control operation can be obtained.

(Embodiment) A suitable embodiment of the device of the present invention will be described with reference to FIG. The fluid pressure cylinder 101 using hydraulic pressure or the like, which is a member that raises and lowers the lower rim 11 and also performs chucking of the upper and lower rims 4 and 11, is the same as the hydraulic cylinder 101 explained in the related art, so a re-explanation thereof will be omitted. do. The booster 301 used in the present invention has a large-diameter piston cylinder 309 and a small-diameter plunger cylinder 308 installed in series, and both cylinders 30
A plunger 307 and a piston 306 are installed so as to be able to move back and forth, and are communicated with a fluid pressure tank (for example, an oil tank) 302 that is separately installed in the middle of the plunger cylinder 308 through a pipe 314 . At this time, a seal 31 is placed on the side of the plunger cylinder 308 across the open end of the piping 314.
5,316 will be installed. This is fluid pressure tank 3
This is to prevent the pressure medium such as oil in 02 from escaping to the piston cylinder 309 side, and the plunger cylinder 308 and cylinder 10
A pressure switch 305 is provided in a pipe 310 that communicates with the piston 103 side of the cylinder 101 to detect a decrease in the pressure of the pressure medium on the lower side of the piston 103 in the cylinder 101.
In the present invention, the electromagnetic directional valves 303, 30
4 to the rod 102 side (the upper part of the cylinder) of the cylinder 101, the upper part of the fluid pressure tank 302, and further the piston cylinder 309 of the booster 301.
As the working fluid pressure to be supplied to both the front and rear sides of the piston 306, pressurized air or the like appropriately pressurized by a compressor or the like is used, and the pressure is supplied via the electromagnetic directional control valve 303 by the piping 317. , can be supplied to the upper side of the cylinder 101 through the piping 311, and can also be supplied to the upper side of the fluid pressure tank 302 through the piping 312 via the switching valve 303, and one of the piping 313 branched out from the piping 311 is A pipe 313 branched from the pipe 312 is provided on one side of the piston 306 of the piston cylinder 309 in the booster 301.
The control fluid pressure (pressurized air, etc.) can be supplied to the other side of the piston 306 via the electromagnetic directional switching valve 304.
With this embodiment, the control operation for the lifting/chucking hydraulic cylinder 101 described above in the operation section can be achieved.

(Effects of the invention) The tire rim chucking means according to the invention completely eliminates the need for the complicated and enlarged hydraulic power unit 201 as illustrated in FIG.
02 is sufficient, which is extremely advantageous in simplifying and compacting the required structure, and also greatly simplifying the fluid pressure piping configuration.Plunger cylinder 308 and piston cylinder with different large and small diameters in booster 301 309, by communicating the fluid pressure tank 302 in the middle of the plunger cylinder 308, the necessary function, that is, the piston 1 in the cylinder 101
03. High-speed ascent of the rod 102, final ascent by increased pressure in the tank, and chucking under high pressure at the same ascent point can be achieved extremely reliably and easily, and moreover, using pressurized air, etc. as the operating pressure for control. Using a gas pressure medium significantly omits the need for hydraulic piping equipment, and pressurized air is easy to use because it is used on a daily basis in factories. Eliminate the hydraulic power unit that takes
Ancillary equipment can be significantly downsized, the area occupied by the entire Uniform Machine can be reduced, it can be renovated as an economical mechanical equipment, and the overall operation and equipment maintenance are easier due to fewer hydraulic equipment. It has excellent features.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing the embodiment of the device of the present invention in a resting state, Fig. 2 is a front view showing the same in a high-speed rising state, Fig. 3 is a front view showing the same in a high-pressure chucking state, and Fig. 4 is a tire FIG. 5 is a perspective view of the main part of the rim chuck of the uniform machine, FIG. 5 is a longitudinal sectional front view of an example of the structure of the main part of the rim, and FIG. 6 is an explanatory diagram of the conventional drive device using the hydraulic power unit. 4... Upper rim, 11... Lower rim, 101... Fluid pressure cylinder for rim lifting and chucking, 301
... Booster, 302 ... Fluid pressure tank, 30
3,304...Electromagnetic directional valve, 306...Piston, 307...Plunger.

Claims (1)

[Scope of utility model registration request] The tire to be tested is sandwiched between upper and lower rims that can be opened and closed, and the tire is chucked against the internal pressure of the tire by supplying pressure to a fluid pressure cylinder that supports the lower rim so that it can move up and down toward the upper rim. In the fluid pressure cylinder, a plunger cylinder and a piston cylinder are provided in series with different diameters on the piston side of the fluid pressure cylinder, and a piston and a plunger accompanying the piston are installed across both cylinders so as to be movable back and forth. The plunger cylinder of the booster communicates with the plunger cylinder, and the plunger cylinder communicates with the fluid pressure tank, and a switching valve is provided on the piston rod side of the lifting fluid pressure cylinder, the upper part of the fluid pressure tank, and the booster piston cylinder side. A tire rim chucking drive device for a tire uniformity machine, characterized in that operating fluid pressure can be supplied through a tire rim chucking drive device.