Electro-hydraulic hammer

Electro-hydraulic hammer is a new type of forging equipment that is energy-saving and environmentally friendly. It has a single-arm electro-hydraulic hammer and a double-arm electro-hydraulic hammer. The working principle is the same as that of the electro-hydraulic power head, but the fuselage is different from the original steaming hammer. The guide of the hammer is changed to the "X" guide.
Electro-hydraulic hammer is a new type of forging equipment that is energy-saving and environmentally friendly. It has a single-arm electro-hydraulic hammer and a double-arm electro-hydraulic hammer. The working principle is the same as that of the electro-hydraulic power head, but the fuselage is different from the original steaming hammer. The guide of the hammer head is changed to the "X" guide rail, which can adjust the gap of the guide rail to within 0.3mm, which greatly improves the guiding precision of the electro-hydraulic hammer, improves the quality of the forging and prolongs the life of the hammer.

Free forging electro-hydraulic hammer features and advantages:

1. Energy saving, environmental protection

2. Easy to operate, labor-saving, flexible and reliable

3. The system works stably and the safety insurance device is fully designed.

4. Special structure, more reasonable and safer

The development of electro-hydraulic hammer at home and abroad has been divided into three stages:

The first generation of electro-hydraulic hammers is a single-acting type, that is, a hydraulic lift hammer and a drop hammer work. The electro-hydraulic hammer has a large mass, low speed and low energy, and the range and production efficiency of the equipment forging and forging are greatly limited.

The second generation of electro-hydraulic hammer is a gas-liquid double-acting type, that is, the lifting hammer is hydraulic, and the striking energy is combined with the work of gravity and gas expansion. Compared with the first generation, this electro-hydraulic hammer has a high hammer speed under the same falling weight conditions, and the betting energy, the frequency of hitting, the production efficiency, and the forging specifications are larger than the former.

The third-generation electro-hydraulic hammer is a double-hydraulic action type, also known as a full-hydraulic electro-hydraulic hammer, that is, the lifting hammer and the striking are hydraulically acting directly on the moving parts of the hammerhead, rather than on the hammer piston directly acting by the gas.

Due to its fast response and high reliability, the all-hydraulic electro-hydraulic hammer is recognized as the most advanced technology at home and abroad, and has been valued and developed by many countries.

(1) The lifting and striking of the hammerhead are all powered by hydraulic pressure. That is, the upper and lower chambers of the hammer piston are driven by hydraulic oil, and the advantages are as follows: A. The sealing is better than the gas working condition, and there is no problem of oil and gas mutual stringing. The hammer piston sealing life is long, generally up to two years. B. The three-bar type two gas rods, four copper sleeves, two jackets, two flanges and related seals are eliminated, which simplifies the structure and completely eliminates the problem of “gas leakage” and reduces nitrogen consumption. The quantity improves the normal operation rate of the equipment and greatly reduces the fault link and maintenance workload.

(2) The pump-accumulator combined transmission type is adopted. The lifting and striking of the hammerhead are jointly supplied by the accumulator and the oil pump, which not only saves the installed capacity, but also the whole system has fast response and high sensitivity. In addition, there is no gas pressure on the upper part of the hammer piston when lifting the hammer, so the hammer is fast. The frequency of betting is high. For the free forging hammer, it is easy to work and flip. For the die forging hammer, the mold squeezing time is reduced, the life of the mold is improved, and some forgings forging at both ends can be formed by fire, saving heating energy, reducing material loss and improving. Production efficiency and increased economic efficiency.

(3) The hydraulic system adopts a large-diameter combined cone valve to control the hammer lifting, striking, stopping, slow descending, etc., while the large-diameter combined cone valve is operated by a small spool valve of the manual operation system. control. Its characteristics are:

A. The pilot valve has small mass, low inertia, and the force of the joystick is very light.

B. The temperature, viscosity and cleanliness of the hydraulic oil are not high, and it can work continuously for a long time without changing the hydraulic oil.

The viscosity requirements of the oil are not too strict. Generally, the mechanical oils of 20#, 30#, and 40# can be used, and even these oils can be mixed to work normally. In short, as long as there is no hard material such as welding slag or iron filings in the oil, the hydraulic system can work normally. Because the system adopts large-diameter combined cone valve, the valve port has good sealing performance, is not easy to leak, energy loss is small, oil is not easy to heat, and the valve has a long service life. After one adjustment, it can be repaired all the year round.

(4) The upper chamber of the hammer piston is closed, and the air chamber is struck when the hammer is struck, and the oil in the lower chamber of the piston is discharged to the upper chamber. The lubrication condition of the piston is improved, the lubrication effect is better, the oil is continuously exchanged, the oil temperature is low, the seal is not easy to aging, and the service life is long. In addition, when the hammer is lifted, the oil in the upper chamber of the piston is discharged back to the tank. In this way, the oil return speed is low, the flow resistance is small, and the oil tank or the oil return pipe does not swell.

(5) The diameter of the hammer is thicker than that of the general electro-hydraulic hammer, and there is a multi-degree of freedom of the hammer connection device with the hammer. The hammer, the seal and the guide sleeve are not affected by the torque caused by the eccentric impact of the forging. The service life of the hammer system is improved, and the general free forging service life is more than two years.

(6) Compared with the hammer piston, the accumulator piston has a small linear speed, which is only 1/6-1/9 of the hammer; the stroke is short, only about 1/3 of the hammer, and there is no eccentric load, the piston The upper and lower forces are basically balanced, the pressure difference is extremely small, and the reliability of the accumulator is higher.

(7) Select high pressure and large flow piston pump (P=31.5MPa, Q=400L/min), low pressure use (general working pressure is below 10MPa), which can make the pump volumetric efficiency, hydraulic system vibration is small, noise is small It is firm and reliable, with less leakage and long service life.

(8) When the hammer head is in non-working state, the hydraulic system can automatically unload, reducing oil temperature and heat.

(9) According to the user's site conditions and usage requirements, the power head and the hammer body can be provided as integrated and separated, which are selected by the user:

(10) According to different free forging and die forging equipment, the operating mechanism can be operated manually or pedaled.

Electro-hydraulic hammer classification and principle

At present, there are three types of electro-hydraulic hammers at home and abroad: classification by structure, classification by transmission medium, and classification according to the nature of forgings.

Electro-hydraulic hammers are classified according to structure: an anvil electro-hydraulic hammer and an anvil-free electro-hydraulic hammer (pair hammer). There are anvil electro-hydraulic hammers are divided into: single-arm type, double-arm type (arch type), bridge type electro-hydraulic hammer.

Electro-hydraulic hammers are classified according to transmission media: liquid-gas electro-hydraulic hammers and full-hydraulic electro-hydraulic hammers.

Electro-hydraulic hammers are classified according to the properties of forgings: die forging electro-hydraulic hammers and free forging electro-hydraulic hammers.

The XY electro-hydraulic hammer mainly has an anvil electro-hydraulic hammer, including a liquid-gas electro-hydraulic hammer and a full-hydraulic electro-hydraulic hammer, and has a die-forging electro-hydraulic hammer and a free-forging electro-hydraulic hammer.

The principle of XY liquid-gas electro-hydraulic hammer is: using electricity as energy, lifting the hammer head by hydraulic pressure to establish the gravitational potential energy, and compressing the gas storage energy. Under the action of the gravity of the hammer head and the expansion thrust of the gas, the hammer head The potential energy is transformed into the kinetic energy of the hammerhead, thus hitting the forging and performing work.

The principle of XY full hydraulic electro-hydraulic hammer is: using electric energy as energy, lifting the hammer head by hydraulic pressure to establish the gravitational potential energy, and transforming the potential energy of the hammerhead into the kinetic energy of the hammerhead under the action of the gravity of the hammerhead and the thrust of the liquid during the striking. , thus hitting the forgings and performing work.

The XY liquid-gas electro-hydraulic hammer hydraulic system is simple, with three rods (one hammer rod and two gas rods); XY full hydraulic electro-hydraulic hammer, only one hammer rod, the mechanical structure is relatively simple. Both structures have their own characteristics, and users can choose according to their specific conditions. At present, the principle of electro-hydraulic hammer is roughly liquid-liquid and full-liquid. As far as its principle is concerned, any form of electro-hydraulic hammer is feasible, and its reliability and economy are inseparable from its principle structure. In other words, the principle structure of electro-hydraulic hammer determines its feasibility. Reliability and economy.
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