Specifications control equipment
Using special provisions in the design of electrical panels, it has been tried to prevent any additional stress from being applied to the load and structure during acceleration and deceleration, and to control the pendulum movement of the load completely.
Overhead crane microswitches
Limit switches that are made in small dimensions are called microswitches. is, it has the ability to move 360 degrees in two directions and two speeds in each direction, this part, by being placed on the carriage of the overhead crane and also the head of the overhead crane, provides restrictions on the transverse and longitudinal movements of the overhead crane. Key A limit switch is a piece of electromechanical equipment that starts working by using mechanical parts, regardless of a material or object. Using micro switches for limit control, state control, status display, part counting and other cases. It is applicable. Limit switches, usually in industrial settings, have the ability to detect the presence and proximity or absence of a substance or object.
Cross limit switch has different functions due to its robustness, easy installation and reliable performance in different sectors, which can be used for example in cutting machines, conveyor belts, automatic lathes, cranes. and elevators and in general in most machines where dimensional movement control is required. In general, limit switches are used with a control relay, a contactor, or as an input in a PLC. In the world, with the advancement of technology, electronic sensors have been made, which now replace limit switches and proximity sensors in most cases. But they are still used due to some of the advantages that limit switches have over proximity sensors.
Advantages of using limit switches
1- Easy to install, economical, easy to use
2- Having a strong body in front Different spatial conditions
3- Accuracy and high reproducibility
4- Compared to other sensors, it has more current tolerance
5- Having resistance against electrical noise
6- Having The lowest voltage drop and no leakage current
7- The simple efficiency of NO blades
Electric devices and machines have always been created to improve the quality of human life. It is also used in different industries
The electrical equipment is very important. Electrical appliances consist of many parts that make the devices work. Limit switch and microswitch are among the devices that are used in most electrical devices and have very different functions.
What is a microswitch?
The act of connecting and disconnecting normal keys is done by microswitches that are like keys. But they are very different from normal keys. In general, the microswitch is a key model with a spring inside it, and when pressure is applied to it, according to the model of the microswitch, the current inside it will be disconnected or connected, and when it is released The opposite of the previous work happens. In general, it can be said that the keys that are activated by a very small physical pressure can be called microswitches, which can be found in most machines and equipment. It is used. The use of microswitches is very common due to their low price and long service life, and accuracy is very important in this case, so it is obvious that this product is used in most industrial devices. Among the simple parts that are used for Microswitches are used to determine the position of moving objects. A microswitch is a piece that is mechanically reversible and is installed without the need for power supply during the movement of the equipment. As we said before, if we want a piece called a microswitch Brim's name is a keying device that is used as a driver in small displacements.
This part is separate from the speed of the driver, which will cause a large displacement of electrical contacts, which, of course, has a very high speed. The appropriate designs of this tool also use the hysteresis phenomenon, which is successful. From this discussion, it appears that the small displacement of the actuator in the reverse direction is not enough to restore the contacts to their original shape, and the actuator must move significantly in the reverse direction as well.
Among the other names of the microswitch, we can mention the quick miniature switch, which has a quick and instant connection. The miniature switch is used as a sensor in automotive, medical and industrial tools. The actuator of these switches generally has a pivot wheel on top of a push button. This equipment is used in an open form in control system plans, such as safety switch connections in elevators, vending machines, etc. In addition, they are used in different industries to improve activities. /p>
What is a limit switch?
A model of an electromechanical device that starts working with the presence of an object is called a limit switch. Limit switches have another name called limit switch. The remarkable thing is that microswitches and limit switches have very little difference. Limit switches are commonly used in industrial settings to detect the presence and proximity or absence of a material or object, but microswitches are used for the following:
• Displaying the status
• Piece counting
• Limit control
• Mode control and... They are very strong and have a very long life, and they can be used in many different places due to their ease of installation and operation. In fact, these limiting keys have many different functions, which can be mentioned in the form of the following items:
• Elevators
• Cranes
• Conveyor belts
• Machines Automatic turning
• Cutting machines
In general, limit switches can be used in many machines in which dimensional movement control is very important and necessary. The noteworthy point is that limit switches are used with a control relay, a contactor, or as an input in a PLC.
Limit switch types:
It should be noted that standard limit switches are very important parts in different industries that have very different functions. Limit switch models are as follows: Push limit switch Pull limit switch Roller limit switch Antenna limit switch Limit switch Crusader
Cross switch limit:
In different industries such as construction, tasks such as raising materials and equipment are very important. So, for this reason, a device called a crane, which has a lot of power, is used to move and lift. It is noteworthy that the function of transferring and moving in any industry must be done according to its needs and has many regulations on the operator and the machine in question. The safety of cranes is very important, that's why the designers and manufacturers of these machines must pay much attention to safety and consider it in every situation. Various functions are used. In addition, special switching settings enable the elimination of defined sections outside the working range of the crane. Microswitches and cross limit switches are used in cranes and elevators. This equipment is specially designed and used for use in heavy industries. The use of these limiting keys brings many benefits, in addition, the material used in the construction of these equipments is very special, which guarantees their strength and longevity.
According to what we have said, one of the Models of limit switches are cross limit switches that are used in cranes and elevators. The cross limit switch of the crane can have many benefits and make the work of the relevant operator much easier and simpler. In general, cross limit switches normally limit the transverse and longitudinal movements of all overhead cranes and also have the ability to move 360 degrees in one or two directions.
The whole limit of cross switches by being placed on the carriage of the overhead crane as well as the head of the overhead crane creates a limit in the transverse and longitudinal movements of the overhead crane and thus ensures the safety of the work when using the crane. Please note that when It is better to buy and use cruciform limit switches if you pay attention to very important points such as the material of the limit switch body (metal, bakelite) and its type and prepare it according to your needs.
Components of limit switch cross:
The cruciform limit switch has different parts that we will discuss:
ACTUATOR: This part is the operator of the cruciform limit switch and the desired object will deal with it.
• OPERATING HEAD: This section is basically a cover of the cross limit switch that will convert the movement of the operator into movement or change in the contacts.
•: SWITCH BODY Note that the limit switch contacts are located in this section that the contacts include open blades no and nc.
Types of crane electrification system:
- Flat and C-rail cable system (for transverse movement of types of overhead cranes, gantry cranes, jib cranes)
- Round cable and towing wire system (for longitudinal and transverse movement of all types of cranes)
- Bus bar rail system (for longitudinal movement of types of overhead cranes and monorails)
- motorized cable collection system (for longitudinal movement of gantry cranes)
- Spring cable system (for the longitudinal movement of gantry cranes and the lifting movement of side tools connected to the crane hook)
One of the parts of all types of overhead cranes is the control and power supply section, which is one of the important topics in this industry due to the mobile nature of the crane. Over the years, electricity supply to overhead cranes, gantry cranes, jib cranes, etc. is mainly done according to the following methods
c-rail or Festoon
There are different types of power supply lines, the simplest of which is power supply by means of an electric cable and a pulley, which moves the cable on the rail by means of a pulley. In fact, this system is used to transmit electricity in direct and short paths. which has the ability to install all types of overhead, gantry, and jib cranes for longitudinal and transverse movements.
Advantages
Easy to install
Low cost
Disadvantages
Impossibility of use in routes of more than 30 meters
Requires service and maintenance
Possibility of danger of electrical connection
Bus Bar or crane bus bar
This method uses a sliding mechanism between the brush coal and the copper busbar to transmit power from the bus bar to the crane. This method is very common for powering overhead cranes, gantry cranes, jib cranes. The range of Bus Bar products is very wide and covers a significant part of the needs of the overhead crane, gantry crane, jib crane industry.
Features of Bus Bar or power bus
- Can be used in applications with high currents
- Very common in crane longitudinal power supply
- Can be used in high temperature environments
- Can be used in environments with high pollution
- Applicable in various open and closed designs
- Applicable in different aluminum and PVC coatings
- Has a modular feature and by replacing damaged parts, no need to change other parts
- Very suitable for very long routes
- Ability to simultaneously feed several cranes that work in a row.
