[0036] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.
[0037] Please combine Figure 1 to Figure 3 As shown, the present invention provides a steel heavy-duty double-frame pressing pulley. The pulley includes a hub 1, a web 2 connected to the hub 1, and a rim 3 connected to the web 2. The above is The prior art part will not be repeated here. The difference from the existing technology is:
[0038] Preferably, the hub 1 is configured as a tubular structure.
[0039] Preferably, the web 2 has two plates, both of which are in the shape of a hollow circular plate, and are arranged as a figure-eight supporting frame structure welded on the hub 1. The big mouth end of the eight-shaped support frame structure is welded to the hub 1.
[0040] Preferably, the rim 3 has a U-shaped cross-section circular ring structure, the outer side of the rim 3 is welded to the web 2 and the inner side of the rim 3 is a rope groove. The rim 3 is made of steel plate or section steel after being rounded and welded into a circle. According to the needs of the user, a special mold is used to press and bend the required rope groove angle. The rope groove can be rounded by one angle steel or plate, or two angle steel or plate semicircle butt joint Welding forming. Preferably, the rope groove is made by welding a 90° right-angled steel coil butt. The rim 3 can be used directly after being pressed into shape. In order to improve the wear resistance and service life of the pulley, the rim 3 can also be used after surface quenching.
[0041] Preferably, the rope groove angle α can be flexibly customized according to user needs within the range of 20° to 160°. The adjustable range of the rope groove angle α is significantly larger than that of integral forged pulleys, welded pulleys and rolled pulleys of the same specification. Adjust and choose different pressing molds to achieve. Preferably, the rope groove angle α is usually 35°, 45° or/and 52° to choose from.
[0042] Preferably, the two webs 2 are welded to the hub 1, the rim 3 is welded to the web 2, and a trapezoidal section is formed between the hub 1, the two webs 2 and the rim 3.
[0043] Preferably, the pulleys are all made of steel materials, the hub 1 is steel pipe, the web 2 is steel plate, and the rim 3 is steel plate or section steel.
[0044] Preferably, the pulley material can be selected from carbon structural steel or alloy structural steel as required. Preferably, the hub 1 is made of 20# steel, the web 2 is made of Q355 or Q345 material steel, preferably Q355 material is used, and the rim 3 is made of 35# right-angle steel.
[0045] Preferably, the lightening holes 4 may not be provided or provided on the two webs 2 according to requirements, and the supporting tubes 5 may not be provided or provided in the lightening holes 4 as required, and the surface of the web 2 has no reinforcing ribs.
[0046] Preferably, when the lightening holes 4 are provided on the two webs 2, 2-10 lightening holes 4 are symmetrically arranged on the two webs 2, and each lightening hole 4 is provided with a support tube 5, and the support tube 5Select 20# seamless pipe.
[0047] The present invention also provides a method for preparing a steel weight-reducing double-panel pressing pulley, which includes the following steps:
[0048] 1) To make hub 1, select carbon structural steel or alloy structural steel pipes, and process pulley hub 1 according to the required specifications. Preferably, 20# steel can be used for hub 1;
[0049] 2) Fabricate frame 2, select carbon structural steel or alloy structural steel plate, and process two pulley frames 2 according to the required specifications. Frame 2 is two round steel plates stamped and formed after blanking. Yes, the web 2 is made of Q355 or Q345 material steel, preferably Q355 material steel. Preferably, the web 2 can be provided with lightening holes 4 according to needs, and a support tube 5 can be added to the lightening hole 4, and the support tube 5 is 20# without Slit tube
[0050] 3) To make the rim 3, select carbon structural steel or alloy structural steel angle steel or plate. After the rope groove is bent from the angle steel or the plate, it is welded to form by a butt joint or two butt joints. Preferably, the rim 3 It is made of 35# right-angle steel. The rope groove angle α can be flexibly customized within the range of 20°~160° according to user needs. It can be realized by adjusting and selecting different pressing molds. Preferably, the rope groove angle α is usually 35°, 45° ° or/and 52° optional;
[0051] 4) Welding, the two webs 2 are arranged in a figure-eight supporting frame structure, the large end is welded to the hub 1, and the rim 3 is welded to the small end of the two webs 2, the two webs 2 and the hub 1, the wheel A trapezoidal cross-section is formed between the edges 3;
[0052] 5) Inspection and delivery, sandblasting and surface painting of the pulleys completed in steps 1) to 4), followed by coding, laser engraving of anti-counterfeiting marks and serial numbers, and then after passing inspections (flaw inspection, coating inspection) , Can be shipped.
[0053] Preferably, the pulley formed by welding in the step 4) can be used directly, and can also be subjected to surface quenching treatment. Preferably, the pulley is used after surface medium-frequency induction quenching. After quenching, low-temperature stress relief treatment is performed to make the pulley rope groove The surface hardness can reach HB280-330, the depth of the hardened layer is ≥2mm, and the depth at 2mm is ≥HB250.
[0054] Preferably, the inspection method is ultrasonic + magnetic particle inspection.
[0055] The weight of the pulley completed through the above steps is significantly lighter than the integral forged pulley, welded pulley and rolled pulley of the same specification, and the weight reduction ratio is between 10% and 45%. The measured weight of a pressed pulley with a bottom diameter of 810mm is 111kg, and the weight of an integral forged pulley with a bottom diameter of 810mm is 200kg; the weight of a welded pulley with a bottom diameter of 810mm is 153kg, and a rolled pulley with a bottom diameter of 810mm is 124kg, converted according to the weight reduction ratio. The 810mm rolled pulley is about 45% less weight than the same specification integral forged pulley, about 27% less weight than the same specification welded pulley, and about 10% less weight than the same specification rolled pulley.
[0056] The double-width plate pressing pulley of the present invention has a wide application range and is suitable for various lifting equipment, such as: lifting equipment of port terminals (container shore cranes, grab ship unloaders, tire cranes, portal cranes, grabs and container spreaders Attachment), large floating cranes, ship engineering cranes, oil rig platform cranes, various types of cranes in factory and mining areas, water conservancy (sluice) lifting equipment, engineering crawler cranes and many other occasions for rope lifting equipment, there are Good practicability and market prospects.
[0057] Those of ordinary skill in the technical field should realize that the above embodiments are only used to illustrate the present invention, but not to limit the present invention. As long as they are within the essential spirit of the present invention, the Changes and modifications will fall within the scope of the claims of the present invention.
