The structure, principle and characteristics of the Walk behind Concrete laser screed machine

1. Machine diagram（Model：EV850-2T walk beind laser screed）

As shown in Fig. 3.1, the machine structure diagram shows that the machine can be divided into three parts：

• （1）、Laser systems: laser transmitters, digital receivers, and three tripods；
• （2）、Vibrating leveling device: vibrating motor, vibrating plate, connecting frame, scraper, vertical pole, etc.；
• （3）、Airframe power: control panel, generator set, electrical control system (distribution box…) Chassis, frame, drive axle, panel etc.

2. Machine configuration table（Model：EV850-2T）

No.	Type		Parameter	Unit
1	Engine		HONDA
2	Driving system		Two wheel independent servo drive
3	Tire		Stab free narrow tire / inflatable tire
4	Measurement and control system		Laser system
5	Horizontal adjustment		Screed head
6	Power		220	V
7	Outline size	Length	3210	mm
		Width	2730	mm
		Height	1160	mm
8	Weight		325	Kg

• * Note: Table 2.1 above configuration is for reference only. HIKING reserve the right to change without prior notice.

3. The working principle of a machine

• Concrete laser leveling machine working principle: the laser transmitter generates rotating laser, laser receiver built-in leveling machine on the received signal, analyzed by laser measurement and control system, the deviation will feedback to the leveling machine on the sensitive computer control system, electric putter will adjust about the height of the scraper, ensure leveling precision.

The technical features of the machine

Laser leveling technology mainly through laser launchers and leveling machine to complete the entire concrete leveling, vibration leveling work. First set the laser emitter fixed, emitted from the emitter laser beam to form a rotating laser control plane, using a hand-held rod will receive the elevation of guide to the concrete work head of laser leveling machine, leveling machine automatic control system on the laser signal according to the laser receiver head to the induction level (10 times per second frequency) automatic real-time adjustment of the laser transmitter in elevation, because after set up fixed, can guarantee the construction of a large area of the ground without cumulative error. Specific technical features are as follows:

• 1 Hand walking、Dual control mode

With automatic control mode and manual control mode, flexible control, can be one-person operation.

• 2 Two wheel independent drive
• Two servo motors respectively drive two wheels, the wheel can move independently, and the whole flat head does not influence each other, and it adopts manual control of the wheel’s forward, backward, steering and moving speed, and it is very convenient to move;
• 3 The laser transmitter is arranged independently
• Large area of concrete can be paved and the uniformity of the ground elevation can be ensured, The elevation is not controlled by the template, and the accumulated error cannot be generated, large areas of block construction, reduced construction joints, so that the cost of later maintenance of the ground is also greatly reduced;
• 4 Integral working head
• The working head is composed of a scraper, a vibrator, a vibrating plate and other components, the leveling, vibrating, and multi-channel operation process are integrated together, which is completed by the machine at one time, thereby improving work efficiency and saving labor;
• 5 High frequency vibrator 3500 times per minute
• The uniform vibration of the vibrating plate of the work head makes the concrete surface compact and avoids the ground cracking caused by the stress
• 6 Work head and machine body do not affect each other

The horizontal plane of the construction can be maintained in the case of a double change of the foundation height and the inclination of the ground

4. The scope of application, performance and technical features of the machine

3.4.1 Product scope

• All kinds of concrete floor (including workshop, workshop, ground, square, underground garage, airport, etc.);
• Construction conditions: 1) ordinary concrete;

2）Basic concrete level error value ≤50mm。

3.4.2 Product performance

• Construction area per hour: 200㎡/h-300㎡/h;
• Concrete scraping, paving, vibrating are completed simultaneously to reduce manual auxiliary work;
• Simple and flexible operation, suitable for all kinds of working conditions;
• High construction accuracy, fully meet the construction requirements.

3.4.3 Product structure and technical characteristics

• （1）The chassis is designed for independent driving with two wheels. The structure is simple, light and powerful;
• （2）The automatic control system which combines computer control technology, laser measurement and control technology and electronic measurement sensor technology ensures the smoothness error and the elevation error of the concrete floor to achieve the best effect;
• （3）Concrete scraping, paving, vibrating are completed simultaneously, very efficient;
• （4）The two wheel drive system is used to drive two wheels to walk independently, and the independent movement of the wheel and the whole flat head do not affect each other. Manual control of the wheel’s forward, backward, steering and walking speed;
• （5）. In the case of high and low ground foundation, to maintain the horizontal surface of the construction;
• （6）With automatic construction mode and manual operation mode.

 

5. The main parts of the product

3.5.1 Alternator

 

No.	Type		Parameter	Unit
1	Model		HONDA SH3900EX
2	Displacement		196	cc
3	Rotating direction		Clockwise rotation
4	Engine oil system capacity		0.5	L
5	Fuel		92# Gasoline
6	Fuel capacity		17	L
7	Start method		Manual/ Electric
8	Outline size	Length	623	mm
9		Width	438	mm
10		Height	491	mm
11	Weight		46	Kg

 

3.5.2 Laser transmitting and receiving element

 

No.	Type	Parameter	Unit
1	Working diameter	300	m
2	Auto adjust	Reset±5	°
3	Auto adjust time	15	S
4	Laser wavelength	635	nm
5	Operating ambient temperature	-10~60	℃
6	Storage ambient temperature	0~30	℃
7	Applicable condition	Floor project
8	Weight	2.5	Kg

Laser emitter button function

• Short press the power button, power indicator light, the laser transmitter starts;
• After laser start, the power indicator flashing, indicating insufficient power, please replace the battery in time;
• Automatic leveling instrument, 635DM wavelength laser visible;
• -20 degrees – 50 degrees, normal work, protection level 1P66.

No.	Type	Parameter	Unit
1	Detection angle	360	°
2	Power	AA 2-D batteries
3	Operating ambient temperature	Normal atmospheric temperature	℃
4	Storage ambient temperature	Normal atmospheric temperature	℃
5	Weight	2.5	Kg

• Considerations for use of laser emitters
• A dangerous part that prevents the human body from approaching the shell;
• Prevent solid foreign matter from entering the shell;
• Prevent water from flowing into the shell.

 

No.	Item	Function
1	Key switch	Starting and closing of generator
2	Timer	Record machine running time
3	Indicator light	The light indicates the normal operation of the generator
4	Indicator light	The light indicates the normal operation of the equipment
5	Indicator light	The light indicates the device is out of order
6	Indicator light	The light indicates the device is abnormal
7	Left elevation button	Manual lifting device for small electric push rod on the left
8	Telescopic button for middle cylinder	Manual lifting device for big electric push rod
9	Right elevation button	Manual lifting device for small electric push rod on the right
10	Auto/ manual mode switch	Auto/ manual mode switch

 

No.	Item	Function
11	Vibrating button	Start / turn off the vibration motor
12	Body power switch button	Start / turn off the body power
13	Laser power switch button	Start / turn off the laser power supply
14	Headlight switch button	Headlamp start / close
15	Horn button	Horn button
16	Emergency stop switch	Connect / cut off the power supply of the machine
17	Level	Used for visual observation of body level conditions
18	Vibration speed control button	Adjust vibration frequency
19	Walking speed control button	Adjust walking speed
20	Forward / backward button	Switch forward, stop, backward
21	Left steering button	Left steering
22	Right steering button	Right steering

• Attention items of panel parts
• The chronograph cannot be replaced by yourself, and the user’s replacement will affect the after-sale service of the product, in case of trouble, shall communicate with HIKING in time;
• When the machine indicator lights are out of order. Stop the operation immediately and turn off the machine;
• The level instrument is only used to observe the horizontal state of the body directly. It cannot be used as the basis for judging whether the working device is horizontal or not.

If you want to buy the walk behind laser screed, please check “walk behind laser screed machine“

2018-10-17