SGA-1 machine for bending reinforcement, review: electrical diagram, connection instructions, detailing, technical specifications, equipment, spare parts, video, manufacturers

Machine for bending reinforcement SGA-1.
Photo by PromStroyMash From the moment man learned to process metals and create various structures from them, the problem of expanding the scale of production became acute. Today, the metalworking industry offers us many equipment options for fast and convenient work in enterprises. The main task of such machines is not only to improve the quality of the final product, but also to speed up the work process and improve conditions for the machine operator . Let's take a closer look at this type of machine, such as mechanisms for bending fittings and pipes, namely SGA-1.

Let's analyze its pros and cons, advantages (in comparison with similar devices), operating modes, components and consumables that are used in working with metal. We will also consider the technical characteristics and list which factories produce these machines and whether it is worth buying used equipment.

Advantages of the bar bending machine

Considering the active development of scientific and technological progress, you need to understand that most of the innovations produced by manufacturers around the world are modifications of simple mechanisms that were discovered more than a century ago.

A logical question immediately arises : is it as rational to use machines for bending fittings and pipes as manufacturers claim?

In order to answer this question, you need to turn to statistics on production volumes before 1915, because it was at that moment that automatic and semi-automatic machines for bending metals began to be introduced on a large scale. It’s hard to believe, but until this moment, metal products were bent by hand, and sometimes, in order to process a reinforcement bar, the efforts of 3 or even 4 people were required.

This leads to the first advantage, namely acceleration of the work process and increase in production volumes.

If the machine is so efficient, then it must have some kind of disadvantage, for example, large dimensions or a complex connection diagram. Despite the fact that the device belongs to the budget category, its transportation, installation and connections do not cause any inconvenience , the diagrams are intuitive, and if this is not enough, a connection diagram and instructions are included with the machine.

The second advantage is ease of transportation and installation.

Everything is set up, there is enough material, electricity is supplied. The mechanism is equipped with a control panel, with which you can control the operating mode, set various parameters and stop the product preparation process at any time. Therefore, operating the machine is not difficult at all.

Machine for bending reinforcement SGA-1. Production - Russia. Photo VseInstruments.ru

The third plus is ease of use and ease of use.

It is also worth noting the economic factor. Most modern machines with high power consume enormous amounts of energy, however, their efficiency does not increase from this. The SGA-1 model is made taking into account this factor and does not consume electricity above normal .

The fourth plus is savings.

Another undeniable advantage is the use of a worm gear . This factor extends the life of the device and reduces the chance of failure of the feed mechanism.

Description and technical features of the model

The manufacturer provides additional holes in the working disk into which additional spare parts and stops with different diameters can be installed. With their help, it becomes possible to form hooks of non-standard diameter. This is the advantage of SGA-1 over competitors' models.

How to knit foundation reinforcement correctly

Unlike analogues, the compact dimensions of 76*79*68 centimeters and the light weight of the machine (380 kg) make it mobile and suitable for use in limited space.

Basic technical characteristics of SGA-1:

disk rotation speed range – from 3.4 to 14 rpm;
an electric motor with a rated power of 3 kW, which operates from a three-phase electrical network with a voltage of 380 V.
possible bending radii of steel bars depend on their diameter and range from 20 to 55 millimeters.

The machine manufacturer provides several modes for bending reinforcement. The choice of mode depends on the diameter of the workpiece being processed. Below are the maximum permissible diameters for each mode:

A-I – 40 mm;
A-II – 36 mm;
A-III – 32 mm.

The SGA-1 model is also suitable for bending metal products with a round or rectangular cross-section. To do this, install additional spare parts of a suitable design on the upper disk.

Functions

The SGA-1 device has two operating mechanisms, namely mechanical and automatic. In the first version of work, the entire process is completely controlled by the operator, and in the second case, the performer only feeds the workpieces and removes the finished products.

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For bending what kind of reinforcement

Using SGA-1 you can process such types of reinforcement as :

working;
constructive;
installation;
anchor

Examples of bending possibilities
Maximum cross-section of a workpiece rod:

A-I – 40 mm;
A-II – 36 mm;
A-III – 32 mm.

Let's summarize. The machine can work with reinforcement with a medium cross-sectional size, which is made of standard carbon and alloy steels. In principle, its power will not be enough to bend very hard metal rods, but most types of reinforcement are made from soft steels.

ATTENTION! Under no circumstances should you try to install two workpieces between the rollers at the same time, even if their total density is less than specified in the specifications for the machine. The fact is that the rollers are calculated taking into account the load on one point, and by installing two workpieces, you disrupt the operating mode, which leads to equipment failure.

SGA1 Machine for bending reinforcement (Bending SGA-1)

Characteristics
Specifications
Bending force, MPa 400

Bending of reinforcement class A-I (A240) with a diameter of 40 mm

Bending of class A-III (A400) reinforcement with diameter, mm 32
Bending of class A-500C reinforcement with diameter, mm 28
Bending of At500 class reinforcement with diameter, mm 32
Bending disc rotation speed, rpm 3,7,14
Voltage, V 380
Engine power, kW 3
Frequency, Hz 50
Limit switch protection YES
PEDAL CONTROL IS
Set of bending devices 1 set
Overall dimensions, mm 760x790x800
Weight, kg 386
Oil, l. 8

Description

SGA-1 is used for preparing reinforcing bars with a cross-section of up to 40 mm. Bending of reinforcement is carried out using a cold electrochemical method. The SGA machine is used for preparing rolled metal for subsequent use in reinforced concrete production. The system can be installed in workshops and in open areas, provided that a canopy is installed. Designed for use in temperate climates. The machine is driven by a pedal mechanism; as a result of closing the contacts, a rotating mechanism is activated, moving clockwise. When disconnected, the bending disk returns to its original position and the contacts open. The equipment requires a good foundation to ensure minimal vibration. The sga machine is attached to the floor using anchor bolts. The use of communications is provided: ventilation, grounding, power supply of 380 V. Oil change is carried out through a worm gearbox. Maintenance is recommended to be carried out once a month, which should include checking components and testing the equipment in “idle” mode. The installation of a device for bending reinforcement with a variable cross-section is provided. The main feature is that the inertia of the bending disk should be taken into account when working with the machine. The stop cam should be advanced by 30° at 3.7 rpm and 150° at 14 rpm relative to the limit switch position.

Spare parts for the SGA machine

Reviews

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Specifications

Features of the bending machine for reinforcing steel SGA-1

On the plate of the SGA-1 machine there is a funnel for removing scale with a flange for joining to the aspiration system;
The bending disk is driven through a V-belt transmission from the engine;
It is possible to perform simultaneous bending of several reinforcement bars;
All spare parts for the machine are easily interchangeable.

Machine characteristics

Power - 3 kW
Maximum permissible diameter of fittings, mm. — from 10 to 32 mm (Rebar class GOST 5781-82 and 10884-94, A-240, A-400, A-500S, At-500)
Internal bending radius, mm. — 20-55
Dimensions LxHxW, cm - 79x69x68
Weight, kg. - 380.

The machine can perform up to 8 bends per minute.

SGA 1

The machine consists of the following main components: frame 1, gearbox 2, plate 3, fixture for bending reinforcement 4, pedal control 5 and electrical equipment 6.

The machine frame consists of a frame and a carriage.

The frame is welded, made of angle steel and serves to fasten all components of the machine.

The carriage is used to mount the electric motor and tension the V-belts. On the upper belt of the frame there is a plate assembled with a gearbox and a device for bending reinforcement.

Magnetic starters and a circuit breaker are installed in the front part of the frame.

A pedal-controlled plate is welded to the lower belt of the frame.

Gearbox 2 consists of a closed worm pair and two pairs of open spur gears.

Changing the rotation speed of the bending disk is done by rearranging gears 6 and 7.

Plate 3 serves as a gearbox cover and a machine work table.

Square strips with holes for stop pins 5 of the bending device are welded to the plate.

Roller conveyors 7 and limit switches for reverse II and stop 9 of the bending disk are mounted on the plate.

To remove scale, a funnel with a flange fastening is mounted on the plate to adapt it to the workshop exhaust ventilation.

1 – plate; 2 – disk; 3 – roller; 4 – central finger; 5 – pin; 6 – roller; 7 – roller conveyor; 8 – stop cam; 9 – final stop switch; 10 – reverse cam; 11 – final reverse switch; 12 – finger.

The device for bending reinforcement consists of a bending pin 12, a central pin 4 with roller 3, a thrust pin 5 with roller 6. On the bending disk 2 there are four holes with bushings for the machine bending pin 4, as well as stop cams 8 and reverse 10. It is necessary to have keeping in mind that the stop cam 8 is shorter than the reverse cam in order to avoid it switching the reverse limit switch.

Electrical equipment of the SGA-1 machine

SA – automatic switch;
SQ1…SQ3 – limit switch; KM – magnetic starter; PT1 – thermal relay; K1 – button; M – electric motor. consists of an electric motor (M), magnetic starter (KM-1.KM-2), automatic switch (SA1), pedal limit switches (SQ1), reverse (SQ2) and stop (SQ3), thermal relay (PT1), stop button (K1). When the circuit breaker (SA1) is turned on, the machine is powered.

When the pedal is pressed, the contacts of the limit switch (SQ1) close and the bending disk rotates clockwise. When switching the contacts of the limit switch (SQ2), the bending disk returns to its original position until the contacts of the limit switch (SQ3) open, and the motor stops. The repeated cycle of machine operation occurs in the same way

The operating principle of the machine when bending reinforcing steel:

Rod A is placed on the bending disk 2 between the central pin 4 with roller 3, bending pin 12 and thrust pin 5 with roller 6.

When the disk rotates, bending pin 12 jams rod A and bends it around roller 3.

When the disk is returned, the bending pin 12 releases the reinforcement bent to the required angle. Products from reinforcement bars with an internal bending radius of 55 mm are made by bending around roller 5, and with a radius of 20 mm - by bending directly around the central pin 4.

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Wiring diagrams

The machine consists of a support frame on which a plate and a gearbox with a special device are placed, which is responsible for bending parts from rods. The electronics are controlled using a pedal ; pressing it begins the process of closing the contacts. There are also clamps between which the part and the bending roller itself are installed.

Most often, in the SGA-1 machine, the bar for the thrust pins fails , since the walls between the compartments are quite thin. As a result of improper operating conditions, or processing of workpieces made of too hard metal, the walls may be damaged. The bending disk for reinforcement also suffers (for the same reason), although it can fail due to unbalance of the rotation axis.

In addition, for correct operation you need oil , which is poured into the gearbox, and the machine parts are lubricated with it. Without it, the worm shaft heats up and the efficiency of the entire working process drops.

Electrical control circuit

Kinematic diagram

Operating instructions and appearance

How does the machine work? It works by bending hooks, which subsequently serve as a support for modifying the shape of the workpiece.

Sequence and guidelines for working on a bending machine:

Reinforcement bending process

It is necessary to install the workpiece between the central pin, the bending and thrust pin with the adjusting roller.
As a result of the rotation of the disk, the central and bending fingers clamp the workpiece and bend it to a given angle.
A subsequent reverse movement releases the bent reinforcement.
The machine stops by pressing the second cam on the second limit switch.
Additional spare parts, stops, on the disk are needed to perform different amounts of bending.

Operating modes

Operation of SGA-1 in manual mode:

power is supplied to the machine using a circuit breaker;
pressing the pedal causes the contacts to close and the disc rotates forward;
to stop rotation, you must release the pedal;
reverse occurs the next time you press the pedal;
releasing the pedal stops reverse rotation.

Auto mode

Bending of rods on the machine can take place automatically. For this purpose, manufacturers offer to additionally equip the machine with an electronic unit, which helps control the process of working with rods.

Working in automatic mode provides for the presence of two submodes:

single bend mode;
n-bend mode using eight installed programs.

The display is made of shockproof material and is located on the side panel of the machine. It displays the current value for the bend angle, which can be changed using the +/- keys. Pressing the key once changes the angle by one degree, and pressing the button for a long time changes the angle by ten degrees.

Technical problems

FAQ.

Reverse does not change

For example, the reverse of a machine does not change . In order to solve this problem, you need to inspect the three-phase motor, and specifically test it in idle mode. If the same changes are observed at idle, then most likely the engine needs to be replaced or repaired.

Vibration

Machine SGA-1, used for bending reinforcement.
Photo by PromStroyMash Another common problem is machine vibration , even due to the absence of a workpiece. This may indicate that the motor is not running properly, or the main center axis is unbalanced, or the unit is not securely secured to the floor, or the pad between the unit and the floor is uneven or at an angle.

Manufacturing plants

Mashstroykonstruktsiya
PromStroyMash
RusInStroy
Gigant (Machine tool company)

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All production facilities of the above companies are located in Russia. This is due to the low price and fast delivery speed. Nevertheless, the SGA series is perhaps the only one that has found application abroad.

These certified manufacturers have at their disposal all the necessary documents and certificates for sale; their machines undergo a quality control procedure and suitability for work.

ATTENTION! If you purchase used equipment and the seller refuses to provide certificates or documents that confirm the fact that the machine was purchased at the factory, most likely you are dealing with a fake.

Spare parts, gears, repair kits, repairs

The same applies to components. Manufacturers do not just focus on purchasing factory spare parts. Check out the contact block on our website, which contains trusted manufacturers and component suppliers to be sure of the correct operation of the purchased machines.

Companies involved in the repair and service of machine tools are presented here.

Let's summarize the review. The SGA-1 machine is a universal mechanism for working with fittings for various purposes and structures . Its price and characteristics will allow you to start production from scratch and receive a net profit in just a few months, taking into account the costs of electricity and maintenance. Operation, installation, and transportation of the machine does not bring additional inconvenience if you order the equipment from certified manufacturers that were listed in the article.

Do not neglect diagnostics and inspection of equipment, since one incorrectly configured machine can damage the entire electronic network if it is included in the production chain or disable nearby equipment through mechanical damage.