Small Shop Bridge Crane

1. Product Introduction:

 

The new European type small shop bridge crane is designed and manufactured according to the FEM standards. Cranes are mainly made up by main beams, end beams, trolleys, electrical parts and control rooms and other components. The standard lifting capacity are 5~20 t. We also can customized the lifting capacity depend on customer requirements.

 
European type small shop bridge crane is widely used in workshops, warehouses and other material handling occasions in machinery manufacturing, metallurgy, food, papermaking, building materials, electronics and other industries. It is forbidden to use in flammable and corrosive media environment. The working level is higher than that of traditional single girder overhead cranes, which can reach A5-A6.

 

2. Parameters:

Lifting Weight(t)	1				2				3				5				10				20				Customized
Span(m)	7.5	10	15	18	8	13	18	27	7.5	12	18	23	8	12	15	18	8	12	15	20	10	16	19	26	Customized
Working Speed (m/min)	Customized
Model of Electric Hoist	Electric European Wire Rope Hoist Trolley
Lifting Speed(m/min)	Customized
Hoisting Height(m)	Customized
Working Class	A5-A6
Electric Current	Three-phase AC 380V 50Hz or Customized

 

3. Component:

European type small shop bridge crane is composed of main girder, end girder, hoisting mechanism, traveling mechanism, electrical and so on.

 
The main beam and end beam are welded box beam structures, and the lower flange plate is used as the running track of the European Wire Rope Hoist Trolley, the main beam and the end beam are connected by high-strength bolts, which are convenient for transportation and on-site installation.

 
The hoisting mechanism adopts European Wire Rope Hoist Trolley, which is compact and easy to maintain. Adopting the C-type structure in which the motor and the reel are arranged in parallel, the motor, the reducer, the reel and the lifting limit switch are integrated design, all main transmission parts are exposed, which is convenient for installation and maintenance. The shell adopts a rod-shaped frame structure, that is, the reducer and the electric control box are connected by a round rod to form the main body of the hoist. It can adapt to the needs of different reel lengths and different lifting heights by simply changing the round rods of different lengths. The suspension trolley adopts the side hanging form of low building height and is controlled by frequency converter.

 
The overall optimized design of the traveling mechanism adopts a three-in-one drive device and variable frequency speed regulation, which has the advantages of compact structure, low noise, and maintenance-free operation.

 
The electrical connection adopts the international standard heavy-duty aviation plug, the protection level is IP65, and has the characteristics of fast plugging and unplugging, and reliable connection.

 

4. Applicable Environment:

European type small shop bridge crane are widely used in workshops, warehouses and other material handling occasions in machinery manufacturing, metallurgy, petroleum, petrochemical, ports, railways, civil aviation, electric power, food, papermaking, building materials, electronics and other industries. It is especially suitable for material handling, precision assembly of large parts and other occasions that require precise positioning, and the working environment temperature is -25-40 ℃. It is forbidden to use in flammable and corrosive media environment.

5. Crane axle and bearing maintenance

 

(1) Maintenance of the journal: the ovality and conicity of the journal after overhaul should not be greater than 0.03mm;

 

(2) Repair of cracks: Use a magnetic or ultrasonic flaw detector to inspect the shaft. There must be no cracks on the shaft, and the scratch depth must not exceed 0.03mm;

 

(3) Maintenance of rolling bearings: An axial clearance in the range of 0.03~0.18mm is allowed between the inner and outer rings of tapered roller bearings. The adjustment clearance of the bearing gland should be within the range of 0.5~1.5mm.

 

6. Crane wheel repair

(1) The wheel tread is worn. If the wheel tread wear exceeds 15% of the original thickness, it should be replaced with a new one. If it does not exceed this value, it can be re-made and heat-treated for repair. The wheel diameter should be within the tolerance range, and the surface quenching hardness is HB300~500. For wheel diameters greater than φ400mm, the quenching layer thickness should be greater than 20mm; when the wheel diameter is less than 400mm, the quenching layer thickness should not be less than 15mm;

 

(2) The diameter deviation of two matching wheels. The diameter deviation of the driving wheel should not exceed 0.1% of the nominal diameter, and the diameter deviation of the driven wheel should not exceed 0.2%. The diameter deviation of the electric hoist wheel should not exceed 1% of the nominal diameter. The driven wheel should not exceed 0.2%; the electric hoist wheel diameter deviation should not exceed 1% of the nominal diameter;

 

(3) Rim wear, breakage, and deformation: the rim should be scrapped if the wear amount reaches 50% of the original thickness or the broken area exceeds 30mm2, and the rim thickness should be scrapped if the bending deformation reaches 20% of the original thickness;

 

(4) Cracks in wheels: If cracks are found in wheels, they should be scrapped;

 

(5) Tread ovality: Wheels with tread ovality reaching 1mm should be scrapped;

 

(6) Wheel assembly assembly: The installed wheel assembly should be able to rotate flexibly by hand. Several wheels installed on the same balance frame should be in the same vertical plane, and the allowable deviation is 1mm.

 

7. Key technical points for crane track installation, inspection and pay-out

The installation of crane rails plays a vital role in the good operation of the crane. Therefore, the crane track must be installed strictly in accordance with relevant standards.

 

A common fault during crane operation is rail gnawing by the trolley, that is, severe friction between the rim of the trolley and the side of the track, resulting in rapid wear and deformation of the rim. At the same time, the side of the track head is also worn. In severe cases, it may be scrapped. There are many reasons for rail gnawing by carts, and poor track laying quality is one of the important reasons that directly affects rail gnawing by carts.

 

 

The quality of track beams is the basis for ensuring the quality of track installation. Generally, the installation baseline of the track is the baseline of the crane beam. Before the track is installed, the track beam must be carefully inspected and the baseline of the track beam must be laid out while inspecting. This work can be measured with a theodolite: measure a point every 2-3m, and measure a point at each column to release the reference center line of the track beam and the track alignment reference line. The distance between the two lines depends on the specifications of the track used. In addition, use a level to measure the level of the crane beam, measuring one point at each column.

 

The quality of the crane beam should comply with the provisions of "Code for Construction and Acceptance of Reinforced Concrete Projects" GBJIO-83. In addition, you should pay attention to the following during inspection:

 

(1) When inspecting the track beam, it must be ensured that the position deviation of the reserved bolt holes along the transverse and longitudinal directions of the beam is less than or equal to 5mm, the displacement of the reserved holes to the two center lines is allowed to be 5mm, and the bolt hole diameter should be 2 times larger than the bolt diameter. -7mm.

 

(2) The deviation of the relative elevation of the planes on the two track beams shall not be greater than 10mm at the pillars and 15mm at other places.

 

(3) The deviation of the beam centerline position from the designed positioning axis shall not be greater than 5mm. The column side dimensions of the reference center line of each track beam must comply with the following regulations:

 

(4) The horizontality of the top surface of the track beam within a 400mm wide range of the bolts is less than or equal to 2mm; the top elevation difference at each bolt in any length of the beam is less than or equal to ±3mm; the top elevation of the beam at each bolt along the entire length of the workshop The difference is less than or equal to ±5mm; and check whether the reserved holes are skewed or blocked.

 

(5) The concrete grouting layer (or leveling layer) between the concrete track beam and the track should comply with the design requirements, and the top surface of the track beam should be washed clean before pouring.

 

After the track beam inspection and setting-out work is completed, the workpieces should be proposed based on the actual situation of the track beam inspection, especially the length of the thread, and should be carefully verified to avoid affecting the installation quality and project progress.

 

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