The construction machinery industry spends more and more

This year, concrete machinery has performed brilliantly and once again exceeded expectations. Until April, the demand for products still exceeds supply. Judging from the monitoring of enterprise ECC, the current equipment usage rate is over 90%. In the recent regional survey on Sany Heavy Industry, we also learned that the demand in the central and western regions was particularly strong. In January-March, Xinjiang's concrete machinery had reached its sales for the whole year last year. Jiangxi had reached sales for the whole year from January to April, and the price of concrete was also Showing upward trend. Pumps, which have a large amount of value but increase labor efficiency, have seen strong growth in recent years. The proportion of sales in concrete products has also increased substantially, which is a representative of product upgrades. The two leading industry giants, Sany Heavy Industry and Zoomlion, accounted for 75%-80% of the market share, so the competitive landscape is relatively stable. XCMG produced about 500 pump trucks last year, but it is also good, but due to the strong demand and supply changes Not great.

Excavators are the highlight of this year, and they have also led to discussions about the rapid expansion of production capacity. Excavator operation flexibility is widely used in urban construction and new rural construction. From a global perspective, it is also the largest market for construction machinery products. In 2011, we are particularly optimistic about two reasons:

(1) This year's small digging sales are related to the “Guidelines for Implementing Agricultural Machinery Purchase Subsidy in 2011”. The construction machinery products included in the farmland basic construction machinery include: agricultural excavators and graders with a bucket capacity of less than 0.4 cubic meters. Dredging machine, the amount of subsidies ranging from region to model, excavator subsidies in 2-5 yuan / Taiwan.

(2) Japan's post-earthquake reconstruction will increase the demand for second-hand excavators. It is expected that the import of second-hand excavators will be greatly reduced and that 40,000 units will be vacated. Therefore, under the optimistic view of the demand for excavators, for the past two years, the excavator's capacity expansion is too fast and the payment terms have declined. We believe this is the painful stage that leading domestic brands must undergo and the outlook is still promising. We are most optimistic about the market share of Sany excavators.

The anticipation of changes in the competitive landscape of the automotive crane industry has led to increased competition in the industry. With Sany Heavy Industry and Liugong cranes producing more than 5,000 units, the market cake will likely be re-divided. Enterprises are constantly adjusting their operating strategies. Zoomlion has reduced the price of some cranes this year. The 250,000-ton truck crane has fallen by about 20,000 yuan, and there are 5% (margin) + 5% (down payment) preferential payment terms. The demand for cranes mainly comes from industries such as petrochemicals, metallurgy, nuclear power, and high-speed rail construction. It is expected that the slowdown in the start of high-speed railways may have a negative impact on the demand for truck cranes. In addition, the strong sales of China United Towers, indicating that real estate investment is not so pessimistic, let alone the construction of affordable housing will ease the pressure of government regulation, good! q The rental rate of construction machinery and equipment has a slight downward trend.

With the increase of equipment inventory, the return on investment of construction machinery and equipment in China has been declining for a long time. Some recent adjustments to sales strategies have reduced the payment conditions, attracting a large number of low-quality customers to enter the market; in addition, the construction mechanization rate has increased. Increased, the working time of a single device is relatively reduced.

Air Pneumatic Cylinder

â‘  Single acting cylinder: only one end of the cylinder has a piston rod. Air is supplied from one side of the piston to generate air pressure. The air pressure pushes the piston to produce thrust to extend and return by spring or self weight.

â‘¡ Double acting cylinder: supply air alternately from both sides of piston, output force in one or two directions.

â‘¢ Rodless cylinder: general term for cylinders without piston rod. There are magnetic cylinder and cable cylinder.

The reciprocating cylinder is called swing cylinder. The inner cavity is divided into two parts by the blade, and the air is supplied to the two cavities alternately. The output shaft swings, and the swing angle is less than 280 °. In addition, there are rotary cylinder, gas-liquid damping cylinder and stepping cylinder.


Compared with the electric actuator, the cylinder can work reliably under harsh conditions, and the operation is simple, and the basic maintenance free can be realized. Cylinder is good at reciprocating linear motion, especially suitable for industrial automation in the most transmission requirements - workpiece linear handling. Moreover, only adjusting the one-way throttle valve installed on both sides of the cylinder can simply achieve stable speed control, which has become the biggest feature and advantage of the cylinder drive system. Therefore, for users without multi-point positioning requirements, most of them prefer to use cylinder from the perspective of convenience. At present, most of the applications of electric actuators in the industrial field require high-precision multi-point positioning, which is the result that it is difficult to achieve with the air cylinder.

The electric actuator is mainly used for rotating and swinging conditions. Its advantage lies in the fast response time and the precise control of speed, position and torque through the feedback system. But when it needs to complete the linear motion, it needs to be transformed by mechanical devices such as toothed belt or screw rod, so the structure is relatively complex, and there are high requirements for the working environment and the professional knowledge of the operation and maintenance personnel.

advantage

(1) The requirement for users is low. The principle and structure of the cylinder are simple, easy to install and maintain, and the requirements for users are not high. Electric cylinder is different, engineering personnel must have certain electrical knowledge, otherwise it is likely to be damaged due to misoperation.

(2) The output force is large. The output force of the cylinder is proportional to the square of the cylinder diameter; The output force of the electric cylinder is related to three factors: cylinder diameter, motor power and screw pitch. The larger the cylinder diameter and power, the smaller the screw pitch, the greater the output force. The theoretical output force of a cylinder with a diameter of 50 mm can reach 2000 n. for the electric cylinder with the same diameter, although the products of different companies are different, they are basically no more than 1000 n. Obviously, the cylinder has more advantages in terms of output force.

(3) Strong adaptability. The cylinder can work normally in high and low temperature environment, and has the ability of dustproof and waterproof, which can adapt to all kinds of harsh environment. Because of a large number of electrical components, the electric cylinder has high requirements for the environment and poor adaptability.

Air Cylinder, Pneumatic Cylinder, double acting cylinder, single acting cylinder, rodless cylinder

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