Port crane torque limiter (port crane torque limiter)

Installation diagram of moment limiter of port crane

IPort crane torque limiter (port crane torque limiter)summary:
When the port crane (Port Portal Crane and port crane) is working, it is necessary to frequently change the working conditions according to the actual situation on the site, such as changing the lifting angle (amplitude), lifting arm length, etc. while the maximum rated lifting weight and the maximum and minimum working amplitude that can be lifted under different working conditions are different. Therefore, a set of device is required to comprehensively monitor and judge the above parameters to make a judgment on the normal operation, full load, overload Indication of working conditions such as amplitude exceeding upper limit and amplitude exceeding lower limit, and corresponding alarm, prompt and control to ensure normal operation of hoisting machinery.
Torque limiter is a safety protection device applied to lifting machinery according to the above requirements. On the basis of summarizing the experience of torque limiter at home and abroad, our company has developed and produced WTL series torque limiter products by applying new technologies and new devices. The main components of torque limiter include display instrument (including processor), signal box, angle meter or angle length meter (mainly truck crane with changeable boom), weight limiter, wind speed sensor, wind direction sensor, etc.

IIPort crane torque limiter (port crane torque limiter)to configure

IIIPort crane torque limiter (port crane torque limiter)Configuration description
（1） Torque limiter host instrument
Moment limiter of port cranemeter Recommended model: wtl-a200
Signal monitoring: two channels of weight signal and one channel of angle signal monitoring
Screen display: blue or gray white LCD display
Signal output: output relay signal or RS485 signal and 4-20mA
Power supply mode: AC 220V, 380V, DC 24V
Installation method: wall mounted

Wtl-a (200) torque limiter instrument wtl-a200 torque limiter instrument is installed in Dagang Oilfield
Port crane torque limiter (port crane torque limiter)Optional other instrument models: wtl-a300, wtl-a400, wtl-a500, wtl-a600

Wtl-a300 torque limiter instrument wtl-a400 torque limiter instrument wtl-a500 torque limiter instrument wtl-a600 torque limiter instrument

（2） Goniometer
harborMouth crane torque limiter (port crane torque limiter)Available goniometer models: jd-180 and jd-c90
Port crane torque limiter (port crane torque limiter)Recommended model of goniometer: jd-180
Installation position: Port boom root
Installation instructions: the horizontal line of the goniometer is parallel to the arm

Outline dimension drawing of jd-180 goniometer

Jd-180 angle meter jd-180 angle sensor is installed on the port crane

（3） Weight sensor
a. Py type side pressure sensor
Installation position: fixed end of wire rope
Power take-off mode: wire rope tension
Installation requirements: the port hoisting rope must have a fixed end

Outline dimension drawing of Py type side pressure sensor

Py type side pressure sensor installation method of Py type side pressure sensor

b. BH-2 type plate ring pull sensor
Installation position: it is installed at the connection between the fixed rope (fixed rope) of the lifting rope and the boom.
Power taking method: measure the tension of the lifting rope.
Precautions: ① the lifting rope must have a fixed rope (fixed rope)
② There is no fixed pulley at the connection between the fixed rope and the boom
Range selection: maximum rated lifting capacity ÷ wire rope magnification = sensor range

Outline dimension drawing of BH-2 plate ring pull sensor

BH-2 type plate ring pull sensor installation method of BH-2 type plate ring pull sensor

c. SHL type three pulley sensor
Installation method: it is installed on the lifting rope of the port and can be welded on the boom (with bending plate); It can also change with the position of the lifting rope (with universal joint).
Power take-off method: measure the tension of the lifting rope.
Range selection: please tell us the maximum stress of a single wire rope, and our technicians will calculate the corresponding sensor range for you.

Installation example of SHL three pulley sensor

d. ZX type axial pin sensor
Installation position: installed in the lifting rope guide pulley
Installation method: replace the axle pin of the original bearing point
Force taking method: measure the pressure at the force point
Precautions: ① non standard sensors need to be customized
② The shear force of the force point and the sensor should always be consistent to ensure the output linearity of the sensor
③ If the shaft pin sensor is selected, the shaft pin sensor can be customized according to the original pulley shaft pin size. It can be replaced. Detailed dimensions and baffle plate of shaft pin shall be provided
The installation position of the steel wire rope, the magnification of the steel wire rope, the load curve table and other parameters
Range selection: maximum force of current force point

Dimension diagram of ZX type axial pin sensor dimension table of ZX type axial pin sensor small range dimension diagram of ZX type axial pin sensor

ZX type axle pin sensor installation of axle pin sensor of port crane

4、 Control principle of torque limiter
There are three conventional controls of torque limiter in our company: amplitude upper limit control, amplitude lower limit control and overload control, which are described as follows:
1. Amplitude upper limit control: when the boom operates to the minimum amplitude (maximum angle), the instrument will give an audible and visual alarm, the amplitude upper limit relay will act, cut off the amplitude reduction circuit, and make the boom stop amplitude reduction, but it can move in the safe direction (amplitude increase)
2. Amplitude lower limit control: when the boom operates to the maximum amplitude (minimum angle), the instrument will send an audible and visual alarm, the amplitude upper limit relay will act, cut off the amplitude bribe, and make the boom stop increasing, but it can move in the safe direction (amplitude reduction)
3. Overload control: when the actual lifting capacity reaches 95% of the rated lifting capacity, the instrument will send out a full load audible and visual alarm, but not control. When the actual lifting capacity reaches 105% of the rated capacity, the instrument will send out an overload audible and visual alarm, the overload relay will act, cut off the fishing lifting circuit and boom amplitude increasing circuit, so that the crane can move in a safe direction (reduce the number of pairs or drop the hook)

5、 Precautions for ordering torque limiter
1. Specific model (wtl-a100, digital tube; wtl-a200, black and white screen or blue screen; wtl-a300, color screen machine, see product selection manual for details)
2. Several ways of weight (whether it is the main and auxiliary hook or the grab / hook)
3. Line length of goniometer;
4. Load curve table, arm length, magnification and center distance;
5. Sensor model, size and cable length;
6. Whether the weight sensor (pull type sensor) needs supporting guard plate;
7. Wire rope diameter;
8. Output control: normal control: upper limit, lower limit and overload; If there are other special requirements, special remarks are required;
9. Power type (24V, 220V, 380V)

6、 Other: port crane can also be equipped with anemometer. The anemometer is installed at the windward position of the gantry crane.

Zhanjiang port supporting our moment limiter port crane