JPH0242336Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe bending machine that can accurately and easily bend a pipe to a predetermined bending angle.

[Conventional technology]

The pipe bending machine includes a pair of pipe support receivers that support the pipe at two locations sandwiching the bent portion thereof, a pipe pressing body that is disposed between the pipe support receivers and abuts against the bent portion of the pipe, and BACKGROUND ART Conventionally, there has been known a bending drive control device that moves the pipe pushing body in a straight line between pipe support receivers. Further, as the bending drive control device, a hydraulic cylinder and a hydraulic pump device that supplies hydraulic pressure to the hydraulic cylinder are usually used.

When bending a pipe using the conventional pipe bending machine, the bending drive control device was adjusted while measuring the bending angle by pressing a compass-shaped angle gauge against a straight line between the bent parts of the pipe.

[Problem that the invention attempts to solve]

However, in the case of the above-mentioned conventional pipe bending machine, there were problems such as poor workability in measuring the bending angle using an angle gauge, and measurement values being inaccurate due to individual differences.

Furthermore, in the case of the conventional pipe bending machine mentioned above, when the pipe bending operation enters the final stage and the actual bending angle approaches a predetermined value, the actual bending angle is measured using the angle gauge as described above and the measured value is The operation of the bending drive control device based on the bending drive control device has become frequent and complicated, and the work requires special skills and expertise.

An object of the present invention is to provide a pipe bending machine that can accurately and easily bend a pipe to a predetermined bending angle without requiring special skills or skill.

[Technical means to solve problems]

The pipe bending machine according to the present invention includes a pair of pipe support receivers that support a pipe at two locations sandwiching the bent portion of the pipe, and a pipe that is placed between the pipe support receivers and that is in contact with the bent portion of the pipe. A pipe bending machine comprising a pressing body and a bending drive control device that moves the pipe pressing body linearly between pipe support receivers, further comprising at least a position detector for measuring and detecting the position of the pipe pressing body, and at least pipe size data. Correlation data between the position of the pipe pressing body and the bending angle according to bending condition data including a data converter that converts data into corresponding bending angle data; a display that displays the detected position data and/or the corresponding bending angle data transmitted from the data converter; and a display that displays the detected position data and/or the corresponding bending angle data transmitted from the data converter A computing unit that computes the deviation between the position data or the bending angle data corresponding thereto and the separately input set position data or set bending angle data and outputs a control signal based on the deviation to the bending drive control device. It is a feature.

[Effect of invention]

In the above, the data converter includes pipe size data, pipe characteristic data such as spring back related to various factors such as pipe manufacturer, pipe material, and pipe thickness, and hydraulic control characteristic data of the bending drive control device. Correlation data between the position of the pipe pressing body and the bending angle, which is calculated and/or actually measured according to the bending condition data, is input and stored in advance.

Note that there is no particular limitation on the method for selecting the position of the pipe pressing body as a criterion, and for example, it may be the moving distance or stroke length of the pipe pressing body,
Alternatively, it may be a position from a fixed reference point of a reference point that interlocks with the pipe pressing body.

In the above data converter, the detected position data of the pipe pressing body transmitted from the position detector is converted into bending angle data corresponding to the input specification of the bending condition data at that time, and the detected position data and bending angle are Data is transmitted to a display and a computing unit. Note that there are no particular limitations on the type or model of the position detector that can be used in the present invention, and for example, a known potentiometer can be suitably used.

Furthermore, the calculation unit calculates the deviation between the detected position data and bending angle data transmitted from the data converter and the separately input set position data and set bending angle data, and when the calculated value reaches a predetermined value. Sometimes a stop signal is generated to stop the bending drive control device. Note that normally, it is sufficient to input the desired bending angle data into the calculator, but in practice,
Preferably, the position of the pipe pressing body can also be selected as a set value.

〔Example〕

Hereinafter, the present invention will be specifically explained from each aspect of the mechanical configuration and the electrical configuration based on the drawings.

<Mechanical configuration> In FIGS. 1 and 2, which are a front view and a partially cutaway plan view, respectively, of a pipe bending machine according to the present invention, a fixed frame 1 in the shape of a triangular wing is located at a symmetrical position in the span direction. A movable frame 3 having a plurality of bearing holes 2...2 and having substantially the same shape as the fixed frame 1 is hinged to the top of the fixed frame 1 with a hinge 4 so as to be openable and closable. A plurality of bearing holes 5...5 are provided at left-right symmetrical positions so as to correspond to the bearing holes 2...2 of the fixed frame 1.

Further, between the fixed frame 1 and the movable frame 3, a pair of pipe support receivers 7, 7 having pipe receiving grooves 6 on their sides are provided with upper and lower bearing holes 5, 2 and 5 at both ends.
The shaft is vertically mounted on 2. The positions of these pipe support receivers 7, 7 can be changed to the respective positions of other laterally symmetrical upper and lower bearing holes 5...5 and 2...2 depending on the pipe size. Note that the pipe support receivers 7, 7 in the present invention may be of a movable type that slides along a predetermined guide path.

Further, a hydraulic cylinder 8 is horizontally fixed to the top of the fixed frame 1 with a stop bolt 9, and a piston rod 10 extends between the fixed frame 1 and the movable frame 3 and between both pipe support receivers 7, 7. Pipe fitting groove 11 curved at the tip of
A pipe pressing body 12 having a side end face of the pipe is connected. Note that this pipe pressing body 12 is replaced depending on the pipe size.

Further, a leg portion 13 is attached to the tail end of the hydraulic cylinder 8 to stably hold the hydraulic cylinder 8 horizontally.

In the above, a hydraulic pump (not shown)
When hydraulic pressure is supplied to the hydraulic cylinder 8, the pipe pushing body 12 moves in a straight line together with the piston rod 10, and as shown by the dashed line in FIG. In this state, the intermediate portion is pressed by the pipe pressing body 12, and the pipe is bent to a bending angle θ corresponding to the position x of the pipe pressing body 12. In addition, the moving distance of the pipe pressing body 12, ie, the stroke length, is adopted as the position x of the pipe pressing body 12 in this case.

On the other hand, a control unit 15 and a linear potentiometer 16 (for convenience, the box cover is not shown) are fixed to the upper and side parts of the hydraulic cylinder 8, respectively, by flexible bands 17, 17. One end of an operating shaft 19 is connected to the slider 18 via an angle piece 20, and the operating shaft 19 is movably passed through a guide hole 21 at the top of the fixed frame 1 along the hydraulic cylinder 8. It is connected to the end of the piston rod 10 via an angle piece 22. Operation axis 1
Each end of 9 is threaded, and each end is connected to each pair of nuts 23, 23 and 2 at a predetermined mounting position relative to each angle piece 20, 22.
4, 24 and is adjustable and fixed.

In the above, since the slider 18 of the potentiometer 16 moves in parallel with the linear movement of the pipe pusher 12, the potentiometer 16 changes the reference power supply voltage to the voltage corresponding to the position x of the pipe pusher 12. It outputs a divided pressure and therefore acts as a detector for the position x of the pipe pressing body 12.

The configuration of the control unit 15 will be explained below.

<Electrical Configuration> In FIG. 3, which is a functional block diagram of the control unit in the pipe bending machine according to the present invention, the position The potentiometer 16 serving as a position detector detects the voltage as a partial voltage of the reference power supply 26, and the detected position data is converted into an 8-bit digital value by the A/D converter 27 and sent to the data converter 28 as an address. transmitted.

On the other hand, the data converter 28 includes a pipe size instruction switch 29 and an adjustment switch 30.
4-bit pipe size data and 3-bit adjustment coefficient data for correcting errors caused by spring back after bending the pipe, inertia after stopping the hydraulic pump, etc. are input as addresses from each digital switch. The input pipe size data is transmitted to the pipe size display 31.

Since correlation data between the position and bending angle of the pipe pressing body 12 according to the pipe size data and the adjustment coefficient data is input and stored in advance in the data converter 28, the above-mentioned detection transmitted to the data converter 28 is stored in advance. The position data is converted into bending angle data based on the correlation data.

The detected position data and bending angle data in the data converter 28 are transmitted to the position/bending angle display 32.
and is transmitted to the arithmetic unit 33. On the other hand, 12-bit set position data or set bending angle data is inputted to the calculator 33 from the position/bending angle setting unit 34 .

The arithmetic unit 33 calculates "(setting data) - (detection data)", and when the value becomes negative, a control signal is transmitted to the stopper 35. In the stopper 35, the control signal energizes a timer 36 and at the same time opens the contacts of a relay 37, stopping the bending drive controller 25. The contact point of the relay 37 returns after a settling time of 4 to 6 seconds, and the timer 36 is activated by increasing the setting value with the position/bending angle setting device 34 or by returning the hydraulic cylinder 8 to the position of the pipe pressing body 12. It is restored by making the position smaller than the above set value.

It should be noted that the above embodiments do not limit the present invention, and it goes without saying that various design changes and modifications can be made within the scope of the present invention.

[Effect of idea]

As described above, according to the pipe bending machine according to the present invention, it is possible to accurately and easily bend a pipe to a predetermined bending angle without requiring any special skills or skill, and it is possible to bend a pipe to a predetermined bending angle accurately and easily. It is convenient because the angle and the position of the pipe pressing body can be read at all times on the display.

[Brief explanation of drawings]

1 and 2 are a front view and a partially cutaway plan view, respectively, of a pipe bending machine according to the present invention, and FIG. 3 is a functional block diagram of a control unit in the pipe bending machine according to the present invention. Explanation of main symbols, 7... Pipe support receiver, 8... Hydraulic cylinder, 10... Piston rod, 12... Pipe pressing body, 14... Pipe, 16... Potentiometer, 19... Operating shaft, 25... Bending drive control device,
27...A/D converter, 28...data converter, 29
... Pipe size indicating switch, 32... Position/bending angle indicator, 33... Arithmetic unit, 34... Position/bending angle setting device, 35... Stop device.

Claims (1)

[Scope of utility model registration request] A pair of pipe support receivers that support a pipe at two locations sandwiching the bent portion thereof, a pipe pressing body disposed between the pipe support receptors and abutting the bent portion of the pipe, and the pipe pressing body A pipe bending machine comprising a bending drive control device for linear movement between pipe support receivers, further comprising at least a position detector for measuring and detecting the position of the pipe pressing body, and a pipe according to bending condition data including at least pipe size data. Correlation data between the position of the pressing body and the bending angle is input and stored in advance.
a data converter that converts the detected position data transmitted from the position detector and separately input bending condition data into corresponding bending angle data; or a display that displays the corresponding bending angle data, and calculates the deviation between the detected position data transmitted from the data converter or the corresponding bending angle data and the separately input set position data or set bending angle data. A pipe bending machine characterized in that it is equipped with an arithmetic unit that outputs a control signal based on the deviation to a bending drive control device.