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Company Profile
Shenzhen Longteng Machinery Equipment Co., Ltd. is a professional technical enterprise engaged in the development, production and sales of vertical injection molding machines. The equipment produced by the company is widely used in electronic connectors, toys, stationery, clothing, daily necessities, medical care, automobiles, and umbrellas. Molding of plastic products such as bones. From material processing to finished products and after-sales service, our company has established a complete quality assurance system and thoughtful after-sales service, and pursues a win-win strategy for employees, customers and suppliers to create an industrial space for common development.
The company implements quality control over the entire process of product manufacturing. Every employee in the production position must undergo rigorous skills training. Every processing and assembly process has rigorous and scientific process specifications; every manufacturing process has strict Management procedures. A highly skilled manufacturing team and a complete quality assurance system ensure the accuracy of product processing and assembly, thereby ensuring product stability and reliability.
    Shenzhen Longteng Machinery Equipment Co., Ltd. has always adhered to the principle of "quality first, service first, and customer first". We warmly welcome friends from all walks of life to come to guide and negotiate business! 


Computer control system
1. System features: traditional remote control type, the system is controlled by a digital display microcontroller, each action time can be adjusted digitally, the data parameters are displayed by LED (seven-section), and the action buttons are touch buttons.
2. System features: single-scale, 3.2-inch blue and white display, clear and intuitive production status. With pressure pre-adjustment function, it can display real-time time, action, total output, pressure, etc. in real time, easy to operate, stable and reliable.
3. System features: dual-proportional type, hardware self-checking function, software adjustment of analog signal input position control, real-time dynamic observation of pressure, speed, and current output values; input and output ports have overload and short-circuit protection functions. Multi-mold data storage, mold name can be input in Chinese and English, real-time operation assistance.
4. System features: dual-proportional type, hardware self-checking function, pressure control for high-precision pulse width adjustment, temperature control for proportional calculus, multi-mold data storage, and remote communication function.





Common problems and solutions of injection molding machines


1. Product production is unstable or unqualified
In a stable production cycle, the quality of the final product is unstable, which may be caused by the wear of mechanical parts or improper adjustment.
1. Worn screws, check valves and barrels.
2. The internal leakage of the sealing ring in the injection cylinder is damaged.
3. The temperature control of the heating cylinder is unstable.
4. The pressure and speed control part is abnormal.
2. The oil temperature of the injection molding machine is too high
The abnormal increase in oil temperature may be caused by abnormal cooling system or high heat generated by hydraulic components during operation.
1. Abnormal cooling system
1) The supply of the cooling system is insufficient, for example, the water switch is not fully opened, the water pressure is insufficient or the water pump flow rate does not meet the requirements.
2) Pipes such as filters, cooling towers or water pipes are blocked.
3) The cooling water temperature is too high, for example, the cooling tower has insufficient heat dissipation capacity, is damaged or the temperature is too high.
2. The hydraulic system generates high heat
1) The oil pump is damaged, and the internal parts wear at a high speed to generate a lot of heat.
2) The pressure is adjusted incorrectly, and the hydraulic system has been under high pressure for a long time and overheated.
3) Internal leakage of hydraulic components (such as damaged directional valve or damaged seals) will generate heat when high-pressure oil flows through a small space.
3. Produce noise
Abnormal noise generation refers to component damage or improper adjustment. The cause should be found according to the location of the noise and repaired immediately.
1. When the hydraulic oil injected into the tank is insufficient, the oil pump sucks in air or the dirt of the oil filter is blocked, the oil pump will be short of oil, causing the bubbles in the oil to discharge and hit the blades and produce noise. The solution is to check the oil level to prevent air intake and clean the oil filter.
2. The hydraulic oil has high viscosity, which increases the flow resistance. The appropriate hydraulic oil must be replaced.
3. As the bearings or blades of the oil pump or motor are damaged, the concentricity deviation of the coupling will cause noise, so it is necessary to adjust the concentricity or replace the parts.
4. The directional valve cannot respond normally, but its function still exists. For example, the valve core is worn, internal leakage, burr clogging, movement is not flexible, and the solenoid valve fails due to insufficient current, and noise is also generated. The solution is to clean the spool. If the valve core is worn, new parts must be replaced, and the current must be stable and sufficient.
5. When the hydraulic oil flows at high speed, the damage of the hydraulic components or the blockage of the oil pipeline will cause noise.
6. Mechanical parts failure, bearing wear or mechanical lack of lubricating oil or parts loose, find out the cause and tighten or replace the parts to ensure that there is enough lubricating oil.