dredge pumps ranging from inlet diameters of 400mm up to 1400mm. Our CFD optimized pumps have an excellent suction performance, high efficiency, long wear life and require a minimum of maintenance. The pumps can be delivered in different types of wear resistant materials, and can be executed in a large number of different configurations.
Photo of our Dredging Pump:
Single-Walled Dredge Pumps Dredging Pump Dredge Pump,Dredging Equipment,Diaphragm Pump Unisite Group Ltd. , https://www.unisitemarine.com
single-walled dredge pumps are `all-round` and used in all types of dredgers. They are designed for typical pump pressures up to 16 bars, and can be excecuted with different types of pump seals such as: stuffing box, mechnical seal or hydro seal.
Double-Walled Dredge Pumps
double-walled dredge pumps are specially designed for high pressures, starting typically from 16 up to 30 bars. The double-walled pump design is based on the concept of pressure compensation between the outer-, and inner-pump casing. All types of configurations are possible such as 3,4 and 5 vane impellers, and casted or welded outer-casings.
Underwater Dredge Pumps
The underwater dredge pumps are used in cases where the highest possible suction performance is required. They basically have the same possibilities and options as our single-walled pumps have. Depending on our clients' preference they are executed with direct motor drive or integrated gearbox, with or without pressure compensation.
Casting
1)Pattern
Collection in our storehouse. Inspection of pattern in our workshop.
Pieces cast with wrong pattern due to insufficient inspection of pattern are rejected.
Free delivery of pattern (in good condition) with last cast piece of order to our client or stored in our workshop for future new production but with time-limited or quantity-bound.
2)Cast pieces
Material
The use of the cast pieces requires other chemical analysis and mechanical properties (unless otherwise mentioned on drawing).
Cast pieces group S (Wear) :
Impellers, pumphousings, dredge lines (bends, branchpipes, etc.)
Cast pieces group C (Construction) :
Other pieces as pivots, rod eyes, wire sheaves etc.
3)cast seel
GS32NiCrMo14.4.2
Chemical:
C:0.30-0.36% Si:0.60%MAX
Mn:0.60-1.00% Cr:1.00-1.70%
Ni:3.00-4.00% Mo:0.30-0.60% S:0.025%MAX P:0.03%MAX
V:0.05%MAX Cu:0.30%MAX
Mechanical:
Rm:min1100MPa;Rp0.2:≥850
A:≥8%;KV≥15J(20℃)
4)cast iron
3)Inspection
Cast pieces are presented in our workshop, for inspection of dimensions and hardness after sandblasting and machining but before conservation and painting. Measurements are carried out by our services and deviations are sanctioned as follows:
At stress concentration area, MT&PT to check the crack, the qualified standard is no crack at these area.
There is a “farmer shortage†in the countryside. Can state subsidies help?
[China Agricultural Machinery Industry News] Some people say that the status quo of China's rural areas: "after 70" is not willing to plant land, "post-80s" will not plant land, "post-90s" will not mention farming... Then, the problem is coming, later Who will plant it? For a long time in the city, Xiaobian heard the "labor shortage", but did not expect the "peasant shortage" in the countryside.
There is a “farmer shortage†in the countryside. Can state subsidies help?
Why are farmers not willing to farm? This is the first question that everyone thinks of. The British classical economist William Pedi, who is known as the "father of political economy", once said a famous saying: "Labor is the father of wealth, and land is the mother of wealth."
However, in China, “labor†and “land†have not brought wealth to farmers. In short, “planting land does not make moneyâ€!
Let's calculate the account for everyone: How much does a farmer earn in a year?
Land contracting gold is 700 yuan per mu (different from different regions)
Turning the ground sowing: wheat 80 yuan corn 80 yuan = 160 yuan
Seed money: wheat 70 yuan corn 50 yuan = 120 yuan
Fertilizer: Wheat 160 yuan corn 160 yuan = 320 yuan
Irrigation: 2 times of wheat 2 times = 200 yuan
Pesticides: wheat weeding 10 yuan 3 times prevention 40 yuan corn weeding 10 yuan 2 times prevention 30 yuan = 90 yuan
Mechanical harvesting: wheat corn = 200 yuan
Shipping fee: 50 yuan
A total of rigid investment: 1880 yuan. This 1880 yuan is the farmer's field management. Everyday operation must be done by yourself. It is not hired. At present, the average manpower in rural areas is about 100 yuan per person per day. If you need to hire people, the cost price will have to be superimposed.
We are calculating the income of farmers: wheat 1000 kg * 1.25 yuan = 1250 yuan per mu; corn 1300 kg * 0.8 yuan = 1040 yuan per mu, the gross income after the harvest is 2290 yuan, minus the input cost of 1880 yuan, farmers The net income for farming a year is 410 yuan.
Jintou.com said that the above income is actually only theoretical income, but the grim reality tells us that we can't make money and can't make money.
Where have the farmers gone? This is the second key question, and the answer is simple – go out to work!
"The net income per mu of grain per mu is only a few hundred yuan a year. It is better to go out to work in January than to work hard in a year." This is the voice of many farmers.
Nowadays, farming is becoming a “chicken rib†for a large number of rural male young adults. More and more young and middle-aged laborers have collectively fled the countryside through school, work, marriage, etc., and rushed to the city.
Agricultural production is carried out by the "386199 troops" consisting of women, children and the elderly.
Xiaotou of Jintou.com said that young people working in cities and old children staying in villages have become a reality for many villages.
How is food quality so low? Jintou.com introduced that the prices of rice, wheat and corn in China have fallen to varying degrees. Many cooperatives and family farms have suffered a lot of losses.