JPH0318134Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a self-propelled shot blasting machine.

(Prior art) Conventional self-propelled shot blasting machines have two rear wheels.
Wheels, the front wheels are one or two wheels, and the front wheels are run and driven by a motor, but because heavy items such as the impeller, impeller motor, separator, etc. are closer to the rear wheels, the grinding surface If the surface is uneven or uneven, or if the surface to be ground is sloped, there are problems such as the front wheel, which is the driving wheel, slipping or being unable to climb the slope.

Therefore, a method of driving the two wheels on the rear side could be considered, but when turning horizontally, there is a difference in rotation speed between the wheels rotating on the outside of the turn and the wheels turning on the inside, and the inner wheels become more susceptible to turning resistance. There were problems with the machine, such as the inability to turn quickly and poor workability. Another possibility is to use only one rear wheel to drive the machine, but this poses a risk of the machine becoming unbalanced and falling over.

(Purpose of the invention) The object of the invention is to provide a self-propelled shot blasting machine developed in view of these problems.

(Structure of the invention) This invention has a vertical support shaft that rotatably supports a front wheel suspended approximately in the center of the front of the shot blasting machine body, and is horizontally rotatably supported, and a steering handle is connected to the vertical support shaft. At the same time, a limit switch that can be operated in conjunction with the steering operation of the handle is provided on the outer periphery of the vertical support shaft, and a rear wheel drive shaft that extends in a direction perpendicular to the direction of movement of the shot blasting machine is provided on the back of the shot blasting machine body. A rear wheel is rotatably provided on both sides of the rear wheel drive shaft, and a rear wheel is rotatably fitted and supported on both sides of the rear wheel drive shaft, and magnetic clutches are respectively fitted coaxially with the rear wheel and facing the rear wheel. , a self-propelled shotblast characterized in that the magnetic clutch and the limit switch are electrically connected so that the magnetic clutch can be connected to and released from the rear wheel based on a detection signal from the limit switch. The present invention will be explained below based on the attached drawings.

Reference numeral 1 denotes a shot blasting machine main body, and a pair of supporting arms 2 and 2' are provided at the center of the front surface of the main body of the shot blasting machine so as to protrude forward from the top and bottom at a predetermined distance.
A large diameter shaft portion 3a is located between the pair of support arms 2, 2'.
A vertical support shaft 3 with small diameter shaft parts 3b and 3b' protruding from both upper and lower ends connects the upper small diameter shaft part 3b to the support arm 2.
The large-diameter shaft portion 3a is rotatably supported by the ball bearing 4 at the tip and the ball bearing 5 on the upper surface of the lower support arm 2′, and the lower small-diameter shaft portion 3
b' is provided to protrude downward from a through hole 6 formed in the support arm 2'. A bifurcated support receiver 7, 7' is fixed to the lower end of this small diameter shaft portion 3b'.
A front wheel 9 is rotatably supported via an axle 8 between the support receivers 7 and 7'. Reference numeral 10 denotes a steering handle whose one end is fixed to the vertical support shaft 3. By operating this handle, the front wheels 9 can be horizontally turned around the vertical support shaft 3. 1
A switch abutment 1 is attached to the vertical support shaft 3 and comes into contact with limit switches 12 and 13 when the vertical support shaft 3 is rotated by operating the handle 10. Reference numeral 14 denotes a cylindrical bearing support receiver extending in a direction perpendicular to the direction of movement, which is supported at both ends via brackets (not shown) on the back side of the shot blasting machine main body 1, and a rear wheel drive shaft 16 is attached to this bearing support receiver 14. is inserted through the bearings 17 and 1 with both ends protruding outward.
It is rotatably supported via 7'. 18,
18' is a rear wheel that is rotatably supported near the inside of both ends of the rear wheel drive shaft 16 via bearings 19, 19';
Magnetic clutches 20, 20' are arranged on the rear wheel drive shaft 16 between the wheels 7'. These magnetic clutches 20, 20' are connected to the rotor side 21,
21' and the armature side 22, 22', and the rotor side 21, 21' has a key 23,
Rotors 21a and 21 fitted through 23'
a' and a stationary part 21 containing coils 21c and 21c'
b, 21b', and the armature side 22, 22' has spline adapters 22a, 22a' fitted to the wheels 18, 18', and the spline adapters 22a, 22a' are slidably inserted into the spline adapters 22a, 22a'. When the coils 21c, 21c' are energized, the rotors 21a, 21a' are magnetized, so that the armatures 22b, 22b' are connected to the rotor 21.
The rotors 21a, 2 are attracted and magnetically attached to the rotors 21a, 21a'.
1a' and the teeth provided on the opposing front surfaces of the armatures 22b, 22b' engage, and the rotor side 21, 2
1' and armature sides 22, 22' are connected. In addition, limit switch 12,
13 with the switch abutment 11 and the coil 21
When the power supply to c and 21c' is cut off, the magnetization disappears and the armatures 22b and 22b' are pushed back by coil springs and the teeth are disengaged, so that the rotor side 21, 21' and the armature side 22, 22' The connections between the two are becoming unraveled.

Reference numeral 24 denotes a drive motor installed laterally on a support bracket 14a integrally attached to the bearing support receiver 14, and a chain wheel 2 is attached to this drive shaft.
5 is fitted, and the chain wheel 2 is fitted to the chain wheel 25 and one end of the rear wheel drive shaft 16 via a key 26.
A chain belt 28 is placed between the chain wheels 25 and 7, and the rear wheel drive shaft 16 is rotated via the chain wheels 25, 27 and the chain belt 28 by the operation of the drive motor 24. .

The device configured in this way is shown in Figures 1 and 2.
As shown in the figure, when the front wheel 9 faces straight ahead and the switch abutment 11 and limit switches 12 and 13 are not engaged, the drive motor 24 operates to drive the rear wheels via the chain wheels 25 and 27 and the chain band 28. axis 16
When the coils 21c, 21c' are energized, the armatures 22b, 22b' move to the rotors 21a, 21
Attracted and magnetically attached to a', magnetic clutch 2
0, 20' and the rear wheels 18, 18' are connected, and the rotation of the rear wheel shaft 16 is transmitted to the rear wheels 18, 18'.
It moves straight on the surface to be polished by rotating and driving 8'. Next, when the handle 10 is turned to the right in the direction of travel, the front wheel 9 turns to the right together with the vertical support shaft 3, and the switch abutment 11 abuts the limit switch 12, thereby operating the limit switch 12. Then, the magnetic clutch 20 is disengaged by the detection signal from the limit switch 12, and the rear wheel 18 becomes free and spins freely, and only the other rear wheel 18' is driven to rotate, and the shot blasting machine main body 1 is rotated. Immediately make a sharp turn to the right at a right angle. Further, when the handle 10 is turned to the left in the direction of travel, the front wheel 9 and the vertical support shaft 3 turn to the left, the switch abutment 11 and the limit switch 12 are disengaged, and the switch abutment 11 comes into contact with the limit switch 13. Activate limit switch 13.
Then, the detection signal from the limit switch 13 disengages the magnetic clutch 20', and the rear wheel 18' becomes free and spins freely, while the detection signal from the limit switch 12 disengages the magnetic clutch 20, causing the rear wheel to spin freely. The wheels 18 are rotationally driven, and the shot blasting machine main body 1 makes a sharp turn approximately at right angles to the left. In this way, the shot blasting machine main body 1 works vertically and vertically while polishing the surface to be polished.
Move horizontally and quickly. (Effects of the invention) As is clear from the above explanation, the invention provides the following effects.

That is, since the rear wheel side, which carries more weight and is closer to the center of gravity, is the drive side, the wheels will not slip even if there are irregularities or steps on the surface to be polished.

When turning, the outside wheels are driven and the inside wheels are automatically released, allowing for tight turns and good workability.

etc.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing the front wheel side of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a sectional view showing the rear wheel side of the present invention. 1...Shot blast machine body, 3...Vertical support shaft, 9...Front wheel, 10...Handle, 12,1
3... Limit switch, 16... Rear wheel drive shaft,
18, 18'... Rear wheel, 20, 20'... Magnetic clutch.

Claims (1)

[Scope of utility model registration request] A vertical support shaft 3 on which a front wheel 9 is rotatably suspended is horizontally rotatably supported approximately at the center of the front surface of the shot blasting machine main body 1, and a steering handle 10 is connected to the vertical support shaft 3. Limit switches 12 and 13, which can be operated in conjunction with the steering operation of the handle 10, are provided on the outer periphery of the vertical support shaft 3, and limit switches 12 and 13 are provided on the back of the shot blasting machine body 1, extending in a direction perpendicular to the direction of movement thereof. A wheel drive shaft 16 is rotatably provided, and rear wheels 18, 18' are rotatably fitted and supported on both sides of the rear wheel drive shaft 16. Magnetic clutches 20, 20' are fitted and inserted opposite to the rings 18, 18', respectively, and the magnetic clutches 20, 20' are electrically connected to the limit switches 12, 13 to output detection signals of the limit switches 12, 13. The magnetic clutches 20, 20' are connected to the rear wheels 18, 20'.
A self-propelled shot blasting machine characterized by being provided so as to be connectable and detachable to 18'.