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address:No. 298, Xuanjia Village, Xinnan Village Committee, Yaoguan Town, Economic Development Zone, Changzhou, Jiangsu, China
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Hydraulic Tube Expansion Machin

Machine de tube gonflant hydraulique

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Strength expansion effect of 19x1.65 stainless steel pipe ,40kg pressure without leakage:

19x1.65 résistance de tube en acier inoxydable gonflé poinçonnage 40 kg aucune fuite:


Expansion tube operating handle:

Poignée de fonctionnement pour tube gonflé:


Tensile test effect of strength expansion sample:

Effet du test de traction de gonflement de force:




The Yuechang brand hydraulic expansion machine is widely used for the expansion and connection of heat exchange tubes and tube sheets in the manufacturing of heat exchangers, condensers, high-pressure heaters, steam turbines, boilers, and other equipment. It can reliably expand heat exchange tubes of various specifications and materials, especially suitable for the expansion of thick tube sheets and large diameter tube heat exchangers. The expansion joint is uniform, safe and reliable, with a long service life and low failure rate. Simple operation, fast and efficient expansion speed.

Has the following characteristics:

1. The tube sheet of any thickness shall be uniformly expanded at one time in full thickness.

2. Expand the intermediate tubesheet or multi tubesheet heat exchanger at any depth.

3. Expanding the internal thread pipe or welded pipe.

4. After expansion, the residual stress is low, and gap corrosion is not easy to occur.

5. The axial direction of the heat exchange tube is not stretched but slightly contracted after expansion, which is conducive to reducing operating noise.

6. The inner hole error of the pipe is large, and the diameter of the expansion head can be properly adjusted on site (the maximum grinding allowance of the expansion head is 0.3mm).

7. The expansion joint shall be free of oil pollution, and the expansion before welding shall not be affected.

8. The edge of heat exchanger with tube box can be expanded directly, which is very convenient.

9. Single person can continuously expand 6-8 pipe heads per minute.

10. The comprehensive economic benefits have been greatly improved.

La machine à tube à expansion hydraulique de marque Moon long est largement utilisée dans la fabrication d'échangeurs de chaleur, de condenseurs, de réchauffeurs haute pression, de turbines à vapeur, de chaudières et d'autres équipements pour le travail de connexion étanche de l'échangeur de chaleur à la plaque tubulaire, qui peut effectuer un gonflement fiable des Tubes échangeurs de chaleur de nombreuses spécifications et de nombreux matériaux, en particulier pour le gonflement des plaques tubulaires épaisses et des échangeurs de chaleur tubulaires de gros calibre. Le gonflement est uniforme, sûr et fiable, avec une longue durée de vie et un faible taux d'échec. Opération simple, vitesse de gonflement rapide et efficace.

La machine à tube gonflant hydraulique de marque de long mois a les caractéristiques suivantes

1, une fois pour toute l'épaisseur de la plaque de tuyau d'épaisseur uniforme de gonflement.

2, gonfler la plaque de tube intermédiaire ou l'échangeur de chaleur à plaques multiples de n'importe quelle profondeur.

3, gonfler le tube fileté ou le tube soudé sans couture.

4, faible contrainte résiduelle après le gonflement, pas facile à produire la corrosion interstitielle.

5, l'axe n'est pas allongé et légèrement rétréci après le gonflement de l'échangeur de chaleur, ce qui est bénéfique pour réduire le bruit de fonctionnement.

6, le trou intérieur du tube a une grande erreur, le diamètre de la tête de gonflement peut être ajusté correctement sur le site, (la marge de réparation et de meulage maximale de la tête de gonflement est de 0,3 mm).

7, aucune pollution d'huile au niveau du gonflement, le premier gonflement et le soudage ne sont pas affectés.

8, le bord de l'échangeur de chaleur avec la boîte de tube peut être gonflé directement, très pratique.

9, une personne peut être gonflée en continu, 6 - 8 têtes de tube peuvent être gonflées par minute.

10, les avantages économiques combinés ont considérablement augmenté.

Main technical parameters:


Note: website information is for reference only, subject to offline communication and confirmation!

Principaux paramètres techniques:


Remarque: le matériel du site est fourni à titre indicatif seulement, sous réserve de confirmation de la communication hors ligne!

Conditions of Use

1. Indoor use.

2. The ambient temperature ranges from - 20 ℃ to 40 ℃.

3. The monthly average maximum relative humidity in the use area is not more than 85%, and the monthly average temperature of the month is not more than 30 ℃

4. There is no conductive dust, explosive gas, or corrosive gas that can seriously damage the insulation of the metal box.

Structure and working principle

1. Structure of tube expander

The hydraulic pipe expanding machine is mainly composed of hydraulic control system, pressure amplification system, hydraulic pipe expanding control system and automatic water feeding system.

working principle

The hydraulic pump is driven by the motor to pump the hydraulic oil into the hydraulic control system for pressurization, and the pressurized expansion medium is sent to the operating handle through the high-pressure hose, thus exerting pressure on the expansion joint. The pressure setting is mainly used to set the pressure required by the user through the touch screen. The expansion medium pressure during operation is transmitted to the digital analog conversion module through the transmitter. The pressure value is displayed in the "current pressure value" on the touch screen. When the current pressure value is equal to the set pressure value, the depressurization system works to relieve the pressure, and the entire expansion process is completed.

The liquid bag type hydraulic tube expansion technology uses the pressurization principle to generate an ultra-high pressure tube expansion pressure that is sufficient to cause plastic deformation of the heat exchange tube. The pressure acts on the inner wall of the heat exchange tube through an elastic liquid bag, causing plastic deformation of the heat exchange tube, and produces interference with the tube sheet, which is then expanded into the tube sheet hole. With the hydraulic pipe expander and hydraulic pipe expander head provided by Changzhou Zhouhui, the expansion processing process is extremely simple. After the pipe is inserted into the tubesheet and assembled, insert the expansion head into the appropriate position in the pipe hole, press the pressure rise button of the expansion operation handle, and the pipe expander can automatically complete the pressurization, pressure maintenance, pressure relief and other work processes of the expansion according to the set expansion pressure.

To sum up, the liquid bag tube expander is a kind of hydraulic tube expander, which belongs to the flexible expansion process.

Expansion pressure value of conventional tube sheet and heat exchanger (reference)



1. Tube plate material of heat exchanger: 16Mn (15CrMo can be referred to)

2. The strength expansion shall meet the grooving requirements: the groove width shall be 8-10mm. Due to different materials and groove widths, the expansion pressure can be adjusted according to the degree of "depression" after expansion test.

3. Specification of other heat exchange tubes: under the condition of the same material Ф Outside/ Ф The internal ratio (i.e. wall thickness coefficient) determines the expansion pressure value. The larger the wall thickness coefficient, the higher the expansion pressure, and vice versa. The expansion pressure value of heat exchange tubes of other specifications can be determined by Ф Outside/ Ф The value of internal ratio is calculated with the value close to the center of the above table.

4. If the material of tube sheet and heat exchange tube is different from the above, or there are special expansion requirements, it is recommended to conduct expansion process test first, and the test results shall prevail.

Special instructions:

1. Expansion medium: antifreeze, water or water and cutting fluid shall be mixed according to the ratio of 8:2;

2. When replacing the operation power supply, a professional electrician is required to check whether the wiring is correct. Open the cabinet board where the machine touch screen is located, and the indicator light on the relay shows green, indicating that the wiring is correct;

3. Check the anti-wear hydraulic oil condition of the oil tank before expansion, whether the oil quantity is enough [at least above two-thirds of the oil level of the oil tank level gauge], and whether the oil is in good condition;

4. When replacing the expansion head, you must remember to fill up the water, boost the pressure and drain the air [it takes about 10 seconds to increase the pressure, and you can judge whether it runs to the top by the sound of the cylinder], reduce the pressure and absorb water [it takes about 20 seconds to absorb water], and repeat the lifting and depressurizing actions for 3 times to drain the rigid body air and fill the expansion medium. The water adding action is to stop the action of depressurizing [depressurizing is to absorb water];

5. If the expansion head is not inserted into the tube plate hole at the predetermined position, do not click the pressure increase button;

6. The expansion part of the expansion head must be in the tube sheet and inside the tube before expansion;

7. During tube expansion, the expansion head can be pulled out only after the pressure is completely relieved. The expansion pressure is not completely discharged Do not pull out the expansion head before removal. When inserting or pulling out the expansion head, it is forbidden to twist the expansion head.

8. It is recommended to start the oil pump and heat engine for 5 minutes before expansion;

9. The seal between the expansion head and the expansion gun is hard contact. When replacing the expansion head, the cone surface of the expansion head must expose more left-handed nuts. It is recommended to ensure that the left-handed nuts are at least 4 away from the cone surface of the expansion head to the thread.

10. The burr on the inner wall of the nozzle shall be cleaned to prevent scratching the expansion head;

11. During expansion welding, do not stand opposite the expansion gun.

12. Cut off the power supply before leaving after expansion.

Detailed information and operation method can be obtained by email



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