How to modify control system of a concrete batching plant

 The control system of concrete batching plants has a life cycle. Generally, most of the electrical components will age after 4 to 5 years of use. The price of the control system before the modification is much cheaper than the brand new control system after the transformation. Some people would choose to remould part of the system, while others believe it’s better to replace all the parts of the old system.

　　The old-fashioned concrete mixing plant control system is divided into semi-automatic and fully automatic types. Generally, the old-fashioned automatic mixing plant control system needs to be partially modified, and the old semi-automatic centralized control system adopts full modification. At present, a small concrete batching plant for sale is still equipped with semi-automatic systems. After a period of use, they will still need to be modified.

　　Partial modification refers to the replacement of some parts, and replacement of some aging parts that cannot be used normally, such as board cards, plc modules, etc. The advantage is to save money; the disadvantage is that some components may have incompatibility problems. Generally speaking, the centralized control system with a service period of 2 years is recommended to be partially modified.

　　The entire transformation is to directly replace the original cumbersome manual button operation/low-automation control system with a mixing station system with a high degree of automation, weighing, and weighing speed. In addition, the power distribution cabinet line is changed, which makes the original messy thread ends assembled and replaced with a PRC line, so that the replacement is more thorough. The advantage of this approach is that the entire system runs smoothly, is compatible, and supports later function expansion; the disadvantage is that it requires more investment.

　　Due to the different transformation methods and the different specifications and models of the concrete batching plant itself, the transformation cost of the control system is not fixed. It is worth noting that the transformation cost of a compact concrete batching plant is not necessarily less than that of a commercial mixing plant, because although a compact plant is small, it has all necessary parts. The price of each part of its control system is not necessarily lower than that of a large mixing plant.

Reprinted from http://www.concretebatchingplants24.com/how-to-modify-control-system-of-a-concrete-batching-plant.html

Conveying parts of concrete batching plants

 A stationary or mobile batching plant is a combined device used to mix concrete in a centralized manner, used in large and medium-sized water conservancy, electric power, bridge and other projects with large concrete works, long construction periods and concentrated construction sites. Among all the units of a concrete plant, conveying parts play a crucial rule. They function to send raw materials of given ratio and weight to the concrete mixer. Four parts might be applied in a concrete batching plant.

Belt Conveyor

The belt conveyor is used for transporting aggregates, fine aggregates, and used for mixing plants with a spacious site and a high degree of automation. The basic components are frame, conveyor belt, drive roller, modified lower roller, idler roller, driving device, etc. In some cases, cleaners, anti-deflection devices, feeding devices, unloading devices, braking devices, backstops, etc. may also be installed. A belt conveyor is applied in stationary plants over 60m3 and all mobile plants, even though it is a concrete mobile batching plant 25m3.

Bucket Elevator

The hoisting bucket should be hauled by a pulley block and steel wire rope with a brake hoist to achieve the purpose of lifting the hopper. In large and medium mixing plants, double steel wire rope transmission is often adopted; in small mixing plants, suspended single rope transmission or single rope transmission guided by a movable pulley on the hopper are mostly used directly. It can lift a variety of raw materials and is mostly used to lift mixed materials such as fly ash; in two-stage mixing plants, bucket elevators are also commonly used in collecting hoppers, and bucket elevators are generally used for small concrete batching plant production lines.

Screw Conveyor

The screw conveyor is the main equipment for conveying cement and fly ash. The rotating screw blade pushes the material to be conveyed by the conveyor. The force that prevents the material from rotating with the conveyor blade is the weight of the material and the conveyor. The frictional resistance of the shell to the material. It is mostly transported in closed pipelines, which is less affected by the outside world and can ensure the quality of materials. Belt conveyors are used in the production line of large concrete mixing plants.

Pneumatic conveying pump

The pneumatic conveying pump mainly uses compressed air to transport cement and fly ash from the bulk cement truck into the silo.

 

Each part of the conveying system play an indispensable rule in normal operation of a concrete plant. Some of them are also wearing parts. Purchasers are advised to ask stationary and mobile concrete batching plant manufacturers for spare parts if necessary.

Reprinted from https://www.haomei-machine.com/news/technologynews/concrete-plant-conveying-parts.html

Sizes of concrete boom pumps

 Concrete boom pump sizes include length, width and height of the chassis, pump arm height, boom section number, boom diameter size etc.

　　The length of a truck mounted concrete boom pump has various specifications, namely 21 meters, 24 meters, 28 meters, 30 meters, 33 meters, 38 meters, and 35 meters. Different pump trucks will be designed according to the requirements of the length, width and height of the chassis, the efficiency requirements of the mixer, the length of the boom, etc. For example, under the condition that the other configurations of the 33-meter pump truck remain unchanged, the boom design is optimized and the overall layout is adjusted Then launched a 35-meter mixing pump truck.

　　According to the height of the boom of the pump truck, a concrete boom pump can be divided into short boom, long boom, and super long boom. Usually the boom length of 13-28 meters is a short boom, 31-47 meters is a long boom, and 51-62 meters is an ultra-long boom. The most common pump trucks currently on the market are mostly short boom and long boom.

　　According to the different number of boom sections, concrete boom pump trucks can be divided into four types: 2 boom, 3 boom, 4 boom, 5 boom, 6 boom, 7 boom. The most common ones in the market are 2-section arms, 3-section arms, 4-section arms, and 5-section arms. The maximum height of the 5-section boom 4-axle boom is between 50 meters and 56 meters. The size of the pump tube is 125MM.

　　The low pressure type of the pump pipe is a pipe with an outer diameter of Φ133, and the high pressure is a pipe with an outer diameter of Φ140; the low pressure model of the 150 type pump pipe is a pipe with an outer diameter of Φ159, and a high pressure is a pipe with an outer diameter of Φ168. The head of the pump pipe is a specially processed pipe joint, which is connected to the pipe body by welding, and the connection of each pipe is connected by a pipe clamp processed by a precision casting process.

Reprinted from http://concrete-pump-cn.com/a/News/concrete-boom-pump-sizes.html

HZS35 semi automatic concrete batching plant

 

　　As a kind of mini concrete plant, hzs35 concrete batching plant is generally equipped with a semi-automatic mixing system. The main difference between fully automatic and semi-automatic concrete mixing plants is the control system, and the other equipment is basically the same. Both include storage, conveying, weighing, mixing and control systems, and the work flows are also very similar, divided into four parts: sand and gravel feeding, powder (cement, fly ash, expansion agent, etc.) feeding, water and admixture feeding, transmission, mixing and storage Specifically, the material (mainly stones of various sizes) is introduced into the batching machine with a loader for classification and weighing. The weighed sand and gravel are sent to the mixer by the belt conveyor. At the same time, the powder in the powder silo is weighed and enters the mixer through the screw conveyor. Water and admixtures are also weighed first, and then pumped into the mixer. So far, all kinds of raw materials are ready. The mixer starts to work. After the mixing is completed, the unloading door is opened, and the precast concrete falls into the waiting concrete truck (usually a concrete mixer).



　　So, what is the difference between a semi automatic concrete batching plant and a fully automatic concrete batching plant? To put it simply, it is fully automatic that you set up the program on the computer in advance, and then watch the mixing station complete the work process step by step; semi-automatic requires you to press buttons step by step to operate, for example, when the concrete is working to loading, just click Press the button for loading, then the materials will be automatically transported to the weighing hopper. When you need to unload, click the unloading button, and the materials will be automatically discharged into the mixer. The biggest difference between it and fully automatic is that it requires more operators. The advantage is that the cost is low, that is, it is cheaper when you buy it. The disadvantage is that the labor cost is high, that is, it is more expensive for you to use it.

　　Except for 35 concrete mixing stations, almost all batching plants can be equipped with semi-automatic systems, including hzs25, hzs50, hzs60, hzs75, hzs90 and even hzs120 and hzs180. However, in terms of the degree of use, commercial concrete mixing plants above 90m3 are generally not recommended to adopt semi-automatic systems, because the efficiency of the automatic mixing station is significantly higher, and it can better meet the needs of commercial mixing stations to pursue production efficiency.

Reprinted from http://www.batchingplantng.com/haomei-news/HZS35-semi-automatic-concrete-batching-plant.html

Tips for run-in period of 50m3 mobile batching plants

 The newly purchased concrete mixing plant will have a running-in period, and an yhzs50 mobile concrete batching plant is of no exception. The main task during the running-in period is to inspect the operation and stability of the equipment, to understand the details of all aspects of the equipment, so that the concrete mixing plant can pass the running-in period smoothly and give full play to its maximum performance. The matters needing attention are as follows.

1. Pay attention to the work load control during the running-in period of the 50m3 mobile batching plant. The work load during the running-in period should generally not exceed 80% of the rated work load, and proper workload should be deployed to prevent overheating caused by continuous operation of the machine for a long time The occurrence of the phenomenon.

2. Operators should receive training and guidance from the manufacturer, have sufficient knowledge and understanding of the structure and performance of the machine, and obtain the corresponding operation and maintenance experience to operate the machine. The product manual provided by the manufacturer is the necessary information for the operator to operate the equipment. Before operating the machine, be sure to browse the manual for the concrete mixing plant, and operate and maintain according to the requirements of the manual.

3. Pay attention to frequently check the use of lubricating oil, hydraulic oil, coolant, brake fluid and fuel oil (water), and pay attention to check the sealing of the whole machine. In the inspection, it is found that the oil consumption is insufficient and the reason should be analyzed. At the same time, the lubrication of each lubrication point should be strengthened. It is recommended to add grease to the lubrication point during the running-in period.

4. Pay attention to frequently check the operation of each instrument. If any abnormality occurs, stop the machine and eliminate it in time. If the cause is not found, the operation should be terminated immediately before the failure is eliminated.

 

A YHZS50 mobile mixing plant equipment includes twin-shaft mixer, batching machine, cement silo and screw conveyor, computer control room. It adopts JS1000 twin-shaft forced mixer, which is a compulsory and high-efficiency equipment. It can produce plastic and dry concrete and other concretes. It has high production efficiency, short mixing time and beautiful appearance; the batching machine is PLD1600, batching Accurate and fast response, which can be adjusted according to user needs. Because of the small space occupied, the amount of capital occupied, and the production efficiency higher than a general mini mobile batching plant, the yhzs50 concrete batching plant has become an ideal model for bridge construction. If you can pass the running-in period safely, 50 plants will bring you high profits.

Reprinted from https://www.haomei-machine.com/news/technologynews/run-in-period-of-yhzs50-mobile-plant.html

Solution to rotating failure of concrete pump truck arm

Example: A 2006 37-meter concrete boom pump truck suddenly appeared close to the boom during the pumping process. In the remote control state, the left and right sides can only be rotated unilaterally or neither side can be rotated.

　　Failure analysis

　　1. Electrical aspects:

　　(1) Whether the boom rotation limit switch is damaged

　　(2) The power status of the rotary solenoid valve of the boom and whether it is damaged

　　(3) Whether the relay is damaged

　　2. Hydraulic:

　　(1) Valve block problem of boom rotating multi-way valve

　　(2) Problem of boom rotating balance valve

　　(3) Reducer motor failure

　　(4) The reducer is damaged

　　Troubleshooting process:

　　1. Electrical:

　　(1) Check whether the I2.6 and I2.7 lights are on. If they are not on, it means that the boom rotation limit switch is not damaged. If it is lit, we disassemble the corresponding wiring to see if the fault remains: normal, it means that the limit proximity switch is damaged. If it remains, it means that the proximity switch is damaged and there are other faults.

　　(2) Check whether both solenoids are energized or not when the boom rotating solenoid valve is not rotating. Check whether Q3.0 and Q3.1 have output (check whether there is voltage output on lines 69 and 70 of the action boom). There is no output. Check whether the K31, K32 relays and modules are damaged. There is output, but the solenoid valve is not energized. Check whether there is a problem with the disconnected circuit. The solenoid valve is energized, check whether the resistance of the solenoid valve is normal, and the coil of the abnormal solenoid valve is damaged.

　　(3) Check whether the spool of the rotary solenoid valve is normal. Apply 24U voltage to the solenoid valve to see if the spool is moving. There is no action and the spool is damaged.

　　(4) If the electrical aspect is normal, perform hydraulic analysis

　　2. Hydraulic:

　　(1) Check if the multi-way valve head is damaged, and exchange the tubing with the No. 1 boom multi-way valve to see if there is no action when rotating. If there is a proof of the multi-way valve head problem, see if the orifice inside is blocked.

　　(2) Check the rotating balance valve and clean the spool to see if the card is issued.

　　(3) Check the hydraulic motor to see if it can rotate or not, the motor is damaged.

　　(4) Disassemble and inspect the reducer to check whether the bearing inside is damaged, and replace the bearing.

　　l After inspection, the fault of this boom concrete pump truck is that the coil of the rotating solenoid valve is burnt out. After replacing the solenoid valve, the equipment is normal.

　　Summary: Single-turn or non-rotation of the boom is a common fault of the boom-type pump truck, which generally appears in the electrical aspect. Therefore, first from the electrical to the hydraulic, the fault can be quickly eliminated from the easy to the difficult.

Reprinted from http://concrete-pump-truck.com/news/rotating-failure-of-concrete-pump-truck-arm.html

How to extend service life of mobile batching plant silos

How to extend service life of mobile batching plant silos? You are advised to follow the steps below.

Inspection of arch breaking device

The main function of the arch breaking device of the cement silo for a concrete mobile batching plant is to clean the arch breaking device when the dust in the cement silo is solidified due to various reasons. To ensure the durability of the cement warehouse, the daily inspection and normal operation of its arch breaking device are very necessary. Regularly check whether the pipes and connections of the arch breaking device are loose or leaking, regularly check whether the starting components of the arch breaking device in the cement tank are flexible and working properly, and regularly check whether the structure of the arch breaking device in the cement tank is damaged. , Frequently check whether the hanging of the arch breaking device and the welding place of the supporting device are firm, whether the bolts are loose, and the piston of the arch breaking device should be removed and cleaned frequently; ensure that the arch breaking device is clean without too much dust; often Check the circuit of the arch breaking device, and solve the problem in time if any problem is found.

Maintenance of cement silo body

The working environment of the cement warehouse of a mobile concrete batching plant with silo determines that the warehouse body needs to face various harsh external environments. The most direct and effective way to maintain the cement warehouse body is to paint on the warehouse body diagram and maintain good ventilation between the cement warehouse.

Maintenance of dust removal equipment in cement warehouse

The correct use of cement silo dust removal equipment is very important, because it is related to the capacity of the cement silo, discharge rate and other vital issues. The important thing about the dust removal equipment of cement silo is to install a butterfly valve at the bottom of the dust collecting hopper. The dust collector is closed when it is working. All the induced air pipes are connected to the side flange of the dust collecting hopper to provide settlement for the dust blown off by the pulse. Space to avoid secondary pollution of the filter element. According to the actual situation, the butterfly valve is opened regularly every shift or 4 to 5 hours to clean up the collected dust. A pneumatic butterfly valve automatically controlled by the software operating system of the concrete station can also be installed and opened regularly to facilitate the normal discharge of dust.

 

The maintenance of the cement silo for a concrete mobile batching plant is also inseparable from the daily maintenance and maintenance of other components, such as cement silo material level sensing equipment, ladders, guardrails, outriggers, etc., all need to be checked regularly. If there is a problem, it needs to be repaired in time to avoid unnecessary troubles.

Reprinted from https://www.haomei-machine.com/news/technologynews/how-to-extend-silo-service-life.html