JPH03264270A - Automatic high torque rotating device - Google Patents

Abstract

PURPOSE:To improve the efficiency of rotation of a nut by providing a grooved wheel to which a socket is pivotally mounted, a pair of hydraulic cylinders pivotally mounted on a fixed frame, and a crank having an engaging pin located to the tips of a pair of arms pivotally mounted on the wheel, and performing automatic engagement and disengagement between the engaging pin and the wheel. CONSTITUTION:When a cylinder 11 is operated, a tip engaging pin 23 of a crank 17 is engaged internally of a recessed part 6 of a wheel 4, the wheel 4 and an arm 9 are integrally formed, and along with expansion and contraction of a rod, the arm 9 and the crank 17 cause rotation of the wheel 4 with high torque. The rotation force is transmitted through a socket to a nut, and the nut is rotated with given torque. After the rod is expanded to a maximum and the wheel 4 is rotated in a given angle arc, the rod is moved backward. In which case, the engaging pin 23 is dislocated from the recessed part 6, and the arm 9 is returned to its original position in a state that wheel 4 is left stopped. When the rod is expanded again, similar operation described above is repeated. When a cylinder 10 is operated in reverse to the above, the nut is rotated in a direction reverse to a direction described above.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high torque rotation device applied to strong tightening nuts for large construction machines.

(Prior art) As construction machinery becomes larger, the tightening torque for nuts, etc. becomes higher, and in the case of ultra-large vehicles, the torque is 7,000 to 9,000 kg.
A torque of fi is now required.

A conventional rotation device for tightening or disassembling rotates a disk with a plurality of pin holes drilled on the circumference and a socket mounted on the rotation shaft by the extension of a hydraulic cylinder rod. Since the engagement points of the connecting pins were successively changed as the rotation angle increased, it took a great deal of effort and time to assemble and disassemble the machine.

(Problem to be solved) The present invention allows the nut to be sequentially rotated at a predetermined high torque in units of a maximum rotation angle of 60 to 7.5 degrees without requiring any manual labor during the tightening or release operation. The present invention provides an automatic rotation device.

The authority of the device of the present invention consists of a wheel with a concave groove on the outer periphery having a rectangular drive shaft as a pivot, which pivots on the socket of a rotating nut, a fixed frame that supports the wheel, and a bottom side pivoted on the bottom of the fixed frame. A pair of left and right hydraulic cylinders are provided, and a pair of arms are rotatably mounted on the boss portion of the wheel, and each arm has an engagement pin at its tip that engages with a recess in the wheel. The middle of a crank having a tip thereof is pivotally mounted, and the other end of each crank is connected by a pin to the tip of each of the hydraulic cylinder rods.

(Example) The figure shows an example device in the case of a disassembly and assembly stand for a piston rod of a hydraulic cylinder, where l is a fixed frame, 2
is a fixed plate, and 3 is a base frame. 4 is the outer circumferential line 5
The wheel is provided with semicircular recesses 6 at a predetermined pitch, and its boss portion 7 is rotatably supported on a fixed frame, and an arm 8.9 is rotatably mounted on the wheel.

10.11 is a hydraulic cylinder, the bottom side of which is pivotally attached to the bottom of the fixed frame 12.13, and lower 1 to tip 1.
4.15 has a pin connection 18.19 on the proximal end side of the rocking crank 16.17.

The middle part of the crank is swingably attached to the tip of each arm by a pivot 20.21, and an engagement pin 22.23 that engages and disengages from the recess of the wheel is attached to the tip of the crank.

Reference numeral 25 denotes a rectangular drive shaft inserted into the boss portion of the wheel, and a socket 26 into which a nut is fitted is fitted at the end.

27 is the piston rod of the cylinder, and the tip 28 is
The center axis is adjusted and fixed to match the center of the wheel by a fixed saddle device 30 guided by a guide bar 29 provided parallel to the base frame.

31 is a piston, and 32 is a nut which is a rotated body.

In the above device, the hydraulic cylinder 10 serves as a tightening cylinder, and 11 serves as a loosening cylinder.

Since the movements of the cylinder and wheel are symmetrical, the action of the loosening cylinder will be explained below.

The positions of each cylinder before starting are as shown in FIG.

When the cylinder 11 is operated in this state, the end engagement pin 23 of the crank j7 fits into the recess 6, and the wheel 4 and arm 9 become integrated. The rod has an extension of 8≧The arm and crank rotate the wheel with high torque.

This rotational force is transmitted to the socket 26 via the drive shaft 25, and the nut can be loosened coaxially with a predetermined torque.

The required zero torque can be easily set by controlling the hydraulic cylinder. When the rod is extended to its maximum position and the wheel is rotated approximately 75 degrees, it will be in the state shown in Figure 4.
At this time, when the rod is moved backward, the engagement pin 23 of the crank is released from the recessed portion in which it was previously engaged, as shown in FIG.
The rod and arm return to their original positions (FIG. 3) while the wheel remains at that position.

33 and 34 are stoppers.

By extending the rod again from this position, the above operation can be repeated and the wheel 4 can be continuously rotated in one direction.

<Effects> As described above, according to this device, the engagement pin and the wheel recess are automatically engaged and disengaged, making conventional work unnecessary, improving efficiency and enabling safe work. .

The device of the present invention is applicable not only to disassembly and assembly of pistons, but also to various types of high-torque tightening and disassembly, thereby allowing efficient maintenance of large machines.

[Brief explanation of drawings]

Figure 1 is a side view of the rotating device, Figure 2 is a partially cutaway front view,
FIGS. 3 to 5 are explanatory diagrams showing the state of engagement or disengagement between the wheel and the engagement pin. Explanation of drawing symbols: 1 is a fixed frame, 2 is a fixed plate, 3 is a base frame,
4 is a wheel, 5 is an outer circumferential line, 6 is a recessed part, 7 is a boss part, 8
．． 9 is a ° arm, 10 is a tightening cylinder, 11 is a loosening cylinder, 16.17 is a rocking crank, 20.21 is a pivot, 22.23 is an engagement screw, 25 is a square drive shaft, and 26 is a socket.

Claims (1)

[Claims] A wheel with a concave groove on the outer periphery has a rectangular drive shaft that pivots on the socket of a rotating nut, a fixed frame that supports the wheel, and a pair of left and right hydraulic cylinders whose bottom sides are pivoted to the bottom of the fixed frame. A pair of arms are provided and rotatably mounted on the boss portion of the wheel, and each arm has an engaging pin at its tip that engages with a recessed portion of the wheel. and the other end of each of the cranks is connected by a pin to the tip of each of the hydraulic cylinder rods, and the wheels are rotated sequentially in units of a predetermined rotation angle by the extension operation of any of the hydraulic cylinders. An automatic high-torque rotation device that is characterized by being rotated according to the following conditions.