JPS6348659B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic shoe bolt wrench used for attaching and detaching shoe bolts that fasten a track link and shoe that constitute an endless track.

Since shoe bolts are used under harsh conditions such as when being towed at construction sites, the tightening torque for each model is specified.

Furthermore, this specified tightening torque is required to be constant for all bolts.

Since the tightening torque of the bolt is affected by the rotation speed of the hydraulic motor, it is necessary to prevent the rotation of the hydraulic motor from fluctuating during operation.

The wrench of the present invention allows the tightening torque to be set steplessly, reliably maintains the tightening torque for each bolt at the set value, and allows easy attachment and detachment of the bolts.

The configuration of the device of the present invention is as follows: a gate-shaped movable frame that runs along a workbench on which a shoe truck is fixed; a shoe press plate that is hung vertically from inside both side walls of the movable frame so as to face each other; a wrench body, an operating lever for vertically rotating a wrench socket connected to a hydraulic motor shaft installed on the main body and together with the main body, a rotating handle provided on the operating lever, and a rotating handle provided on the operating lever; a potentiometer that is rotated and obtains an electrical output corresponding to the rotation angle; a variable hydraulic pump that supplies hydraulic pressure to the hydraulic motor; a control device that controls the discharge amount of the hydraulic pump; and this control device. and a setting device for setting the desired torque and rotation speed, and the direction of rotation of the hydraulic motor is changed depending on the direction of rotation of the operating handle from the neutral stop position, and the magnitude of the rotation angle is changed. Therefore, the rotation speed is adjusted.

An embodiment of the present invention will be explained with reference to the drawings.

The shuttle truck 1 is adapted to be transported on a roller conveyor 3 provided on a workbench 2.

Reference numeral 4 denotes a gate-shaped movable stand, which includes a handle 7 and a sprocket 7a fixed to the tip of the handle 7.
Driven by a chain 8 engaged with this sprocket 7a, rollers 5 pivoted to a frame 4c fixed to the pedestal 4 roll on rails 6 set in parallel on both sides of the workbench 2. Move and move.
The chain 8 is stretched between brackets 8a, 8a fixed to both ends of the rail 6.

Reference numerals 9a and 9b denote shoe press plates fixed to the inside of both side walls 4a and 4b of the pedestal so as to face each other; 10 is supported on the upper surface of the pedestal 4 via an upright shaft 10a so as to be able to rotate through 360 degrees; A wrench body housing a pump, a hydraulic motor 11, and a wrench rotation shaft 1.
Equipped with two hydraulic pump electric motors 13 and a control device. Reference numeral 14 is an operating lever, and a wrench socket 12 is attached to the tip of the wrench rotation shaft by a link mechanism 14a and a sleeve 14b.
Move a up and down.

Reference numeral 15 denotes an operating handle which is rotated around an axis relative to the operating lever, and is used to adjust the rotational direction and rotation speed of the hydraulic motor 11, as will be described later.

Reference numeral 16 denotes a case in which the rotation angle changing mechanism of the handle and the potentiometer 21 are built in, and as shown in FIG. A rotation of ±45° from the neutral position of shaft 17 is increased to ±150° rotation at potentiometer shaft 20. 22 is a micro switch, 23 is the tip of an actuator, and a click mechanism is formed by a notch on the disc of the pinion to ensure a neutral stop position.

The output voltage from the potentiometer 21 varies the rotational direction and rotational speed of the hydraulic motor 11 using a known control circuit, switching valve, etc.

The potentiometers 24 and 25 are used to specify the tightening torque setting and the maximum rotational speed using setting devices or knobs (not shown) provided on the operation panel 26.

When tightening and fixing the shoe 1a to the link 1b using the above-described device of the present invention, set the maximum rotational speed in consideration of the torque setting and working speed to the tightening torque specified in advance by the knob on the control panel 26. Set.

When the wrench socket 12a is lowered by the operating lever 14 to engage the shoe bolt 1c and the operating handle 15 is rotated from the neutral position N to the tightening side S, the hydraulic motor 11 rotates at a rotation speed corresponding to the rotation angle. When the tightening torque increases, the discharge pressure of the variable hydraulic pump 30 increases, and this pressure is sent to the control device 28 through the pressure transmitter 27. When the pressure corresponding to the set torque is reached, the servo actuator 29 is actuated to increase the hydraulic pressure. The pump discharge pressure becomes essentially zero. The number of rotations adjusted by the operating handle 15 at the neutral position of the handle is adjusted steplessly with the maximum number of rotations set by the potentiometer 25 on the control panel.

Note that when the tightening bolt is removed, the rotational speed is set free and only the torque setting value is applied.

When tightening and removing the shoe bolt, the rotating force of the wrench is transmitted to the shoe rack, which tends to cause rotation, but this rotation is prevented by the holding plates 9a and 9b on both sides, making it safe.

The device of the present invention can uniformly tighten all the bolts in the track chain to a specified tightening torque, and can be operated with one hand using a single operating lever and handle. All you have to do is change the direction of rotation of the handle without the need for complicated switching operations, and you can also freely adjust the rotation speed of the wrench, making work extremely efficient and improving safety. .

[Brief explanation of the drawing]

Fig. 1 is a side view of the device of the present invention, Fig. 2 is a front view, Fig. 3 is a sectional view showing the rotation angle conversion mechanism of the handle shaft, and Fig. 4 is a hydraulic system circuit diagram of the device of the present invention. . 4...Gate type moving frame, 11...Hydraulic motor, 1
2... Wrench rotation shaft, 14... Operation lever.

Claims (1)

[Claims] 1. A gate-type movable frame that runs along a workbench on which a shoe truck is fixed, a shoe press plate vertically installed on the inside of both side walls of the movable frame so as to face each other, a wrench body that can pivot on the gate-type frame, and this body. an operating lever that pivots a wrench socket connected to a hydraulic motor shaft installed above in the vertical direction and together with the main body; a rotating handle provided on the operating lever; A potentiometer that obtains an electrical output corresponding to the rotation angle, a variable hydraulic pump that supplies hydraulic pressure to the hydraulic motor, a control device that controls the discharge amount of the hydraulic pump, and a desired torque and rotation speed for this control device. The rotation direction of the hydraulic motor is changed by the rotation direction of the operating handle from a neutral stop position, and the rotation speed is adjusted by the magnitude of the rotation angle. Hydraulic wrench for shoe bolts.