Sizing table for vacuum and quick sizing

Abstract

The invention discloses a sizing table for vacuum and quick sizing. The sizing table comprises a stander, wherein a sizing vacuum section for cooling a profile is arranged on the stander and is connected with a sizing mold; the sizing vacuum section comprises three sections which includes a first sizing vacuum section, a second sizing vacuum section and a third sizing vacuum section in sequence from left to right and are connected with three exhaust channels arranged on one side of the stander through pipelines in a one-to-one correspondence manner; the three exhaust channels are respectively a first exhaust channel, a second exhaust channel and a third exhaust channel; the first exhaust channel is connected with a variable-frequency vacuum pump; the second exhaust channel and the third exhaust channel are respectively connected with a water ring type vacuum pump. According to the sizing table for vacuum and quick sizing, negative pressure required for the profile can be generated at the highest speed, and the starting-up rejection rate is reduced; the energy consumption of the vacuum pump can be reduced.

Description

technical field [0001] The invention belongs to the field of shaping tables, in particular to a shaping table for rapid vacuum shaping. Background technique [0002] Extrusion molding method to produce PVC door and window products refers to: the extruder melts and plasticizes the PVC material, and then the molten material is formed into a door and window cross-section blank profile of the required specification in the slit die, and is cooled and shaped by the shaping table. Send to the stacking rack for packaging. In this PVC production line, the main function of the setting table is to provide cooling water and negative pressure vacuum for the profiles that need to be shaped. [0003] The length of the conventional domestic sizing table is generally 5 meters to 8 meters. In the vacuum setting, the water ring vacuum pump is generally used to evacuate the setting section to establish a negative pressure, thereby accelerating the flow of water in the setting section, and then...

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Problems solved by technology

[0003] The length of the conventional domestic sizing table is generally 5 meters to 8 meters. In the vacuum setting, the water ring vacuum pump is generally used to evacuate the setting section to establish a negative pressure, thereby accelerating the flow of water in the setting section, and then rapidly cooling the profile for setting. , when the profile just enters the shaping section, the vacuum requirement for the shaping section is the highest. In order to establish negative pressure at the fastest speed, multiple water ring vacuum pumps 1 of the same type are often used at the front end of the shaping section, that is, the place where the profile first enters. vacuuming, such as figure 1 As shown, but the water ring vacuum pump usually adopts the direct water supply method in the actual industrial field use, and the water supply volume is controlled by a fixed valve to determine and control the water level flowing into the pump body. This working method of the water ring vacuum pump cannot make the water The size of the ring is in the best working state of the vacuum pump. When the speed of the motor is constant, within a certain water level range, the water ring formed by high water level is large, and the water ring formed by low water level is small, that is, when the water ring is too large , will increase the power consumption, so the efficiency of the water ring vacuum pump will decrease, and the power loss will increase; at the same time, because the water supply of the water supply pipeline will change with the change of the working state, this will affect the vacuum degree of the water ring vacuum pump to a certain extent. , and this has an impact on the high and fast establishment of the vacuum degree for the newly extruded profile, which is not conducive to the initial good molding of the profile, and at the same time increases the energy consumption

Therefore, the setting table adopts water ring vacuum pump to evacuate in the setting section, which is easy to increase energy consumption, and the vacuum effect is not the best.

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