China Shandong Jianggong Machinery Co., Ltd Company News

Analysis and solution of pressure relief defects of mini excavator arms If the pressure relief of the arms is not very serious, it is generally a normal phenomenon. It depends on how long it takes for the arm to fall to the ground when the arm is raised to the highest and the forearm and bucket are straightened. The normal pressure relief standard of a small excavator is 50ml per hour. If the arm of a small excavator drops automatically during operation, and the drop speed is very fast, exceeding the specified drop distance (the bucket tooth drops more than 95mm in 5 minutes), this is the pressure relief of the arms of the small excavator, also called arm drop. 1. What is the reason for the pressure relief of the arms of a small excavator? 1. The pressure relief of the arms of a small excavator is mainly caused by the movement of the boom, dipper rod or bucket cylinder when the small excavator is fixed. 2. When the multi-way valve is in the middle position, due to the effect of the gravity of the operating equipment, a certain pressure is generated in the oil cylinder. This pressure is transmitted to the multi-way valve through the pipeline. Because there must be a certain gap between the valve cores of the multi-way valve, a certain leakage is formed, resulting in the pressure relief (arm-dropping) phenomenon. Therefore, the small excavator indicates in the manual that the bucket must be supported when the excavator is not working. 3. In addition, if the arm-dropping phenomenon is serious in some parts (the oil temperature is about 45℃, and the bucket teeth drop more than 95mm in 5 minutes), it may be due to the multi-way valve being stuck. Please clean the multi-way valve. 4. First, look at the color of the inner core of the arm-dropping hydraulic shaft under natural light. If it is blue-black or colorful, it means that the oil cylinder is leaking oil, which is a problem with the oil seal. Just change a set. If the oil seal is normal, the inner core is silver-white. 5. The oil seal cannot or the oil seal of the multi-way valve is leaking. 6. The hydraulic pump seal is not good, commonly known as "unloading oil". Just change the seal ring of the hydraulic pump. 2. Solutions to relieve pressure on the arms of small excavators 1. Analyze the temperature of the working environment of the small excavator and the maximum load that the small excavator can accept. 2. After making an accurate judgment, select the appropriate brand hydraulic oil according to the ambient temperature of the small excavator and the load conditions of the small excavator. 3. Replace and maintain the filter element regularly, and pay attention to purchasing genuine hydraulic oil. 4. When the arm drops during operation, you can first adjust the arm pressure to a lower level (smaller than the normal pressure) to observe whether the arm will fall quickly? 5. If the falling speed is very fast, it is recommended to replace the arm oil seal. 6. If the defect still exists after replacing the oil seal, it is necessary to check the arm oil return safety valve. 7. Check the pressure value of the excavator pump valve group.

In view of the particularity of the application scope of small excavators, end users must not conduct preliminary investigation and preparation for the following conditions before operating a small excavator:   1. Before entering the construction site, you need to carefully understand the construction conditions and tasks. After entering the work site, you should strictly abide by the relevant safety regulations of the construction site. The construction conditions and tasks include: the height and depth of filling and excavation, the status and location of exposed cables, various pipes, slopes and wire heights, tombs, tunnels and various obstacles. 2. Carefully check whether the circuit switch contacts and insulation are in good condition. 3. Check whether the fuel, lubricating oil and coolant of the excavator are sufficient. If they are insufficient, add them in time. When adding fuel, it is strictly forbidden to smoke or be close to an open flame to avoid causing a fire. 4. Check the pipelines and operating valves, working cylinders, oil pumps, etc. of the hydraulic system for leaks and abnormal movements. 5. Check whether the wire rope and the clips fixing the wire rope are firm and secure. 6. When the excavator is operating in rocky soil or frozen soil, blasting should be stopped first, and then excavation should be stopped. 7. Inspect, maintain, adjust and tighten the excavator according to daily routine maintenance items. 8. Place the main clutch control lever in the "neutral" position and start the engine (if you start by hand, be careful that the handle may hit someone; if you start with a hand pull rope, do not wrap the pull rope around your hand). Check whether each instrument, transmission mechanism, working device, and braking mechanism are normal. Only after confirmation is correct can you start working. 9. After the engine is started, personnel are strictly prohibited from standing in the bucket, on the arm, on the tracks and in the cab.  

1. Analyze the temperature of the working environment of the small excavator and also analyze the maximum load that the working object of the small excavator can bear. 2. After making an accurate judgment, select the appropriate brand of hydraulic oil based on the ambient temperature of the small excavator's operating area and the load conditions of the small excavator's working object. 3. Replace and maintain the filter element regularly, and pay attention to purchasing genuine hydraulic oil. 4. When the boom phenomenon occurs during operation, you can first reduce the pressure of the boom (less than the normal pressure) and observe whether the boom will fall quickly? 5. If the falling speed is very fast, it is recommended to replace the boom oil seal. 6. If the fault still exists after replacing the oil seal, you need to check the boom oil return safety valve. 7. Check the pressure value of the excavator pump valve group.  

How to buy mini excavator with good cost performance   1. Be sure to choose a large-capacity water tank to save water filling time and ensure continuous construction.   2. It is best for the machine to provide a variety of power to meet different construction requirements.   3. The operating buttons of the machine are simple and easy to operate, and the operator can operate the machine skillfully after a simple understanding.   4. The overall shape is beautiful and the cab is fashionable. A product with a beautiful appearance may not necessarily be of good quality, but a product with a rough appearance may not be of good quality.   5. The starting method of the small excavator is also very important. When we choose, it is best to choose electric start. It would be better if it also has the function of hand start, in case of emergency.   6. The last good brand is also crucial. We can check word-of-mouth online and do more comparisons to see which one has the best price/performance ratio and which one to choose.   When purchasing a small excavator, just pay attention to the above points. I hope it will be helpful to everyone.  

Mini excavator is a common engineering machinery, widely used in construction, agriculture, mining and other fields. Before using a mini excavator, you need to know how to start and ignite it correctly. The following are the steps to start and ignite a small excavator:   Check the machine   Before starting the excavator, you need to check whether the machine is in normal condition. First check whether the machine's oil level, water temperature and battery power are sufficient. Secondly, check whether all parts of the machine are tight, such as wheels, tracks, cab, etc. Finally, check whether the machine's hydraulic system is working properly.   Adjust seat   Before starting the excavator, the position and angle of the seat need to be adjusted. The seat should be adjusted to suit you so that you can easily operate the various control levers.   Turn on the power   Insert the key into the keyhole and turn the key to the right to turn on the power. After turning on the power, an alarm can be heard on the dashboard.   Pedal   Place your foot on the pedal, press the brake pedal, and press the accelerator pedal all the way down. At this time, the engine will start automatically and the engine sound can be heard.   Release the brake pedal   After you hear the engine starting sound, you can release the brake pedal and slowly release the accelerator pedal. At this time, the engine will automatically enter idling state.   Adjust throttle   After the engine enters the idling state, the throttle can be gradually adjusted to reach the appropriate speed. At this time, the sound of the engine can be heard becoming more stable.   Check the dashboard   After starting the excavator, you need to check whether the various indicators and pointers on the instrument panel are normal. In particular, indicators such as engine water temperature, oil pressure, and battery power require special attention. In short, before starting a mini excavator, you need to check whether all parts of the machine are working properly and follow the correct steps. Only correct starting and ignition can ensure the normal working and safe operation of the excavator.  

In recent years, small crawler excavators have rapidly emerged in the construction machinery market and become the new favorite of the industry. Its high efficiency, flexibility and energy saving characteristics make it widely used in various construction sites, farmland reclamation and municipal projects. The emergence of small crawler excavators not only improves the efficiency of engineering construction, but also brings new development opportunities to the construction machinery market.   Small crawler excavators have become a powerful assistant in engineering construction with their unique design and advanced technology. Compared with traditional large excavators, small crawler excavators are more flexible and can travel and operate freely in small construction sites without space restrictions. Its small size and adjustable bucket angle allow it to easily handle a variety of construction needs, such as digging, grading and loading. In addition, small crawler excavators also have good control performance and stability, and can maintain smooth operation on uneven terrain, providing higher safety and reliability for construction.   The energy-saving and environmentally friendly features of small crawler excavators have also attracted much attention. Traditional large excavators usually use diesel engines, which consume large amounts of fuel and cause great pollution to the environment. Small crawler excavators use advanced electric or hybrid technology, which greatly reduces fuel consumption, reduces carbon dioxide emissions, and effectively protects the ecological environment. This is also in line with the current society's pursuit of green and sustainable development, making small crawler excavators very popular in the market.   With the continuous development of the construction machinery market, small crawler excavators are also constantly innovating and upgrading. Some manufacturers apply intelligent technology to the design of small crawler excavators, giving them the ability to operate automatically and remotely. This not only improves construction efficiency, but also reduces labor costs and safety risks. At the same time, some small crawler excavators are also equipped with multi-functional working devices, such as drilling, piling and crushing, to further meet different construction needs.   The rise of small crawler excavators has brought new vitality and opportunities to the construction machinery market. Its high efficiency, flexibility and energy saving characteristics meet the construction party's needs for mechanical equipment, and also meet the society's requirements for environmental protection and sustainable development. It is foreseeable that small crawler excavators will continue to play an important role in the future and promote the development of the construction machinery industry in a more intelligent and green direction.  

The selling points and advantages of small crawler Excavators mainly include the following aspects:   1. Flexibility: Small crawler excavators are small in size and light in weight, and can rotate and operate freely in small spaces. They are suitable for small space operations such as urban construction and road maintenance.   2. Versatility: Small crawler excavators have multiple functions such as excavation, loading, leveling, and crushing, which can meet different operating needs and improve work efficiency.   3. High energy efficiency: Small crawler excavators adopt advanced hydraulic systems and power systems, which have high work efficiency and energy utilization, reducing fuel consumption and operating costs.   4. Easy to control: The small Crawler Excavator is equipped with a humanized design control system, which is simple and convenient to operate, reducing the operator's labor intensity and improving the accuracy and safety of the operation.   5. Easy maintenance: The small crawler Excavator adopts a modular design, which is easy to maintain and maintain, reducing repair time and costs.   6. Environmental protection and energy saving: The jianggong small crawler excavator adopts advanced emission control technology, has the characteristics of low noise, low vibration and low emission, and meets environmental protection requirements.   To sum up, small crawler excavators have the advantages of flexibility, multi-functionality, high energy efficiency, easy operation, convenient maintenance, environmental protection and energy saving, etc., and are suitable for various operating environments and needs.  

In view of the particularity of the application scope of mini excavators, end users must not conduct preliminary investigation and preparation for the following conditions before operating a small excavator:   1. Before entering the construction site, you need to carefully understand the construction conditions and tasks. After entering the work site, you should strictly abide by the relevant safety regulations of the construction site. The construction conditions and tasks include: the height and depth of filling and excavation, the status and location of exposed cables, various pipes, slopes and wire heights, tombs, tunnels and various obstacles. 2. Carefully check whether the circuit switch contacts and insulation are in good condition. 3. Check whether the excavator's fuel, lubricating oil, and coolant are sufficient. If they are insufficient, add them in time. When adding fuel, it is strictly forbidden to smoke or get close to an open flame to avoid causing a fire. 4. Check the pipelines and operating valves, working cylinders, oil pumps, etc. of the hydraulic system for leaks and abnormal movements. 5. Check whether the wire rope and the clips fixing the wire rope are firm and secure. 6. When the excavator is operating in rocky soil or frozen soil, blasting should be stopped first, and then excavation should be stopped. 7. Inspect, maintain, adjust and tighten the excavator according to daily routine maintenance items. 8. Place the main clutch control lever in the "neutral" position and start the engine (if you start by hand, be careful that the handle may hit someone; if you start with a hand pull rope, do not wrap the pull rope around your hand). Check whether each instrument, transmission mechanism, working device, and braking mechanism are normal. Only after confirmation is correct can you start working. 9. After the engine is started, personnel are strictly prohibited from standing in the bucket, on the arm, on the tracks and in the cab.  

The battery is very important for a 3-ton electric forklift. If you want to extend the battery life, reduce safety hazards, reduce costs, and improve the economic benefits of the enterprise, you must not only maintain and maintain it regularly, but also pay more attention to it in daily operations.   Some people may ask, even if they maintain the battery frequently, why is the battery life still declining? This brings up a problem that most people ignore - overcharging.   The dangers of overcharging are great, and electric forklift manufacturers will provide detailed information to drivers about the specific dangers.   If the battery of a 3-ton electric forklift is overcharged, a large amount of gas will be produced inside it, and this gas will wash away the positive and negative plates of the battery. Although the positive and negative plates are protected by glass fiber on the outside, if they are washed away by gas for a long time, the active material will fall off, which will drastically reduce the battery life of the electric forklift.   Not only that, overcharging the battery will also accelerate the loss of water, affect the decomposition of the electrolyte, cause the battery temperature to rise and even spontaneously ignite, endangering the safety of the driver.   Electric forklift manufacturers tell drivers that excessive discharge may also cause the positive and negative plates to soften. Although it will not cause a major safety hazard, it will also have a considerable impact on the life of the battery.   How to protect the battery of a 3-ton electric forklift? When driving uphill or against the wind, try not to accelerate too hard to prevent the battery from draining too quickly and damaging the battery.   In addition, drivers should know that overcharging and overdischarging the battery are not good. When the driver notices that the battery is only 30% left, it is necessary to charge it in time. Electric forklifts that have not been used for a long time should also be charged regularly every week to protect the battery from damage.  

There are two types of batteries for electric forklifts, lead-acid batteries and lithium batteries. From the perspective of battery type, the choice of forklift battery is not complicated, but some other factors often make it difficult for decision makers to decide! For example: capacity, charging speed, cycle life, brand, price, etc., choosing a matching battery is related to the follow-up of the enterprise production operations, so selecting the correct forklift battery is critical.   Nowadays, environmental protection is an issue advocated by all walks of life. With the advancement of lithium battery materials, lithium-ion batteries can be quickly charged at any time on electric forklifts, and their advantages such as long life are becoming more and more prominent. The advantage of electric forklifts is that they are quiet and environmentally friendly. I believe everyone can understand this, and there is no pollution when working indoors. At present, most of the batteries used in electric forklifts on the market are lithium batteries. Of course, there are also lead-acid batteries. So what are the advantages of using lithium batteries for forklifts compared to lead-acid batteries? Compared with large batteries such as lead-acid and nickel-cadmium, lithium batteries do not contain elements that pollute the environment such as cadmium, lead, and mercury, and are pollution-free. When charging, it will not produce "hydrogen evolution" phenomenon similar to that of lead-acid batteries, and will not corrode wire terminals and battery boxes, which is environmentally friendly and reliable. Lithium-ion batteries can be cycled more than a thousand times, with a lifespan of 3-5 years, no memory effect, and no need for frequent replacement.   The lithium-ion battery pack has an intelligent BMS lithium battery management and protection system, which can effectively automatically cut off the main circuit for failures such as low battery power, short circuit, overcharge, and high temperature, and can feed back data to the APP to let users know in real time Battery usage, smarter forklift lithium battery system and high alarm, these are functions that traditional lead-acid batteries do not have.   It can be charged quickly and requires less maintenance. For industries with special needs, such as warehousing and logistics, airport freight, etc., lithium batteries can be charged in "fast charging mode". Within 1-2 hours, the battery can be fully charged to keep the vehicle fully charged. Load, uninterrupted work; at the same time, after the lithium battery is self-packed, there is no need for any special water filling, regular discharge, etc., which can greatly reduce the follow-up.   Lithium batteries have so many benefits, but the overall cost and subsequent replacement costs may exceed lead-acid batteries! Therefore, consumers can make comprehensive choices based on long-term operating costs when choosing.