mold clamping unit fall into the hydraulic type and hydraulic-mechanical type a) Hydraulic Mold Clamping Device The hydraulic mold clamping device achieves the opening and clamping as well as locking of As indicated in Fig 6-6 is the basic sti a simplest sin direct-acting hydraulic mold clamping device, which is mainly applied to mini-injection molding machine. The mold clamping oil tank is also referred to as mold locking oil tank, whose principa function is to push and lock the mold plate through the oil pressure in the oil tank. The front and rear mold plates are supported by the rod and secured by the nut, ensuring that the moving plate can move forward and backward on the rod 1. mold clamping oil tank; 2. rear fixed mold plate; 3. moving plate: 4. guide bar 5. mold: 6. front fixed mold plate: 7. nut of guide bar Fig 6-6: single-tank direct-acting hydraulic molding clamping device The hydraulic mold clamping device comprises the following features Space between the molds and the range of thickness of the molds are both large The adjustment of clamping force can be achieved through adjusting oil pressure; the clamping force can be directly numerated, which is quite convenient a The moving plate can stop at any place within the range of stroke, which is very convenient for adjusting mold space The par be self-lubricated and is low in abrasion Injection molding machine with strong clamping force requires large mold clamping oil tank and high oil hich is disadv for the sealing and manufacturing of hydraulic therefore the poor steadiness of clamping force shall influence the quality of products b)Hydraulic-Mechanical Type As indicated in Fig. 6-7, a large clamping force can be gained through small oil tank pushing force and the enlargement of bar linkage mechanism. Such mold clamping unit combined by hydraulic and mechanical function improves the speed of mold clamping and saves power consumption, which is very vantageous for improving equipment structure and reducing product cost. Current commonly-used types are the single-toggle and double-toggle hydraulic-mechanical mold clamping devices The hydraulic-mechanical mold clamping device embodies the following features Having power enrichment function, which can reduce power consumption. a Having self-locking function. Even if the oil pressure is removed, clamping force shall not disappear. The molds can be securely and steadily locked a The moving speed of the mold plate is variable, wherein during mold clamping it is from fast to low and during mold opening from slow to fast then to slow again, which ensures themold clamping unit fall into the hydraulic type and hydraulic-mechanical type. a) Hydraulic Mold Clamping Device The hydraulic mold clamping device achieves the opening and clamping as well as locking of molds through hydraulic pressure. As indicated in Fig.6-6 is the basic structure of a simplest single-tank direct-acting hydraulic mold clamping device, which is mainly applied to mini-injection molding machine. The mold clamping oil tank is also referred to as mold locking oil tank, whose principal function is to push and lock the mold plate through the oil pressure in the oil tank. The front and rear mold plates are supported by the rod and secured by the nut, ensuring that the moving plate can move forward and backward on the rod. 1. mold clamping oil tank; 2.rear fixed mold plate；3. moving plate；4. guide bar； 5.mold；6. front fixed mold plate；7. nut of guide bar Fig.6-6: single-tank direct-acting hydraulic molding clamping device The hydraulic mold clamping device comprises the following features: „ Space between the molds and the range of thickness of the molds are both large. „ The adjustment of clamping force can be achieved through adjusting oil pressure; the clamping force can be directly numerated, which is quite convenient. „ The moving plate can stop at any place within the range of stroke, which is very convenient for adjusting mold space. „ The parts can be self-lubricated and is low in abrasion. „ Injection molding machine with strong clamping force requires large mold clamping oil tank and high oil pressure, which is disadvantageous for the sealing and manufacturing of hydraulic system. „ The plenty of pipeline for hydraulic system tends to be difficult for ensuring no leakage, and therefore the poor steadiness of clamping force shall influence the quality of products. b) Hydraulic-Mechanical Type As indicated in Fig.6-7, a large clamping force can be gained through small oil tank pushing force and the enlargement of bar linkage mechanism. Such mold clamping unit combined by hydraulic and mechanical function improves the speed of mold clamping and saves power consumption, which is very advantageous for improving equipment structure and reducing product cost. Current commonly-used types are the single-toggle and double-toggle hydraulic-mechanical mold clamping devices. The hydraulic-mechanical mold clamping device embodies the following features: „ Having power enrichment function, which can reduce power consumption. „ Having self-locking function. Even if the oil pressure is removed, clamping force shall not disappear. The molds can be securely and steadily locked. „ The moving speed of the mold plate is variable, wherein during mold clamping it is from fast to slow and during mold opening from slow to fast then to slow again, which ensures the