Roll changing device capable of keeping negative pressure

• Main Authors: WANG ZHENGSHUN, LENG ZHONGJIE, LIU GANG, WANG ZHIJIAN, YU XIAOHUI, VAHAB, MAGED, WANG XIAOHUI, SHAN TIKUN
• Format: Patent
• Language: Chinese; English
• Published: 26.09.2023
• Subjects: CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES; PACKING; PERFORMING OPERATIONS; STORING; TRANSPORTING

The utility model relates to a roll changing device capable of keeping negative pressure, which belongs to the technical field of toilet paper production equipment and comprises a main machine and a negative pressure fan, a main machine vacuum valve is arranged on one side of the main machine, the negative pressure fan is connected with a fan safety valve, and a negative pressure buffering device is arranged between the main machine and the negative pressure fan. Connecting pipes are respectively connected between the negative-pressure buffer device and the main machine and between the negative-pressure buffer device and the negative-pressure fan, a negative-pressure safety valve is arranged on the negative-pressure buffer device, after coil replacement, the vacuum valve of the main machine is closed, the negative-pressure fan continues to work, the negative-pressure buffer device is evacuated, and when the negative pressure in the negative-pressure buffer device reaches the negative pressure of the negative-