S25 Double Arm Continuous Resin Sand Mixer Installation Instructions

1.Structural principle of double-arm continuous sand mixer
The double-arm continuous sand mixer is mainly used to achieve a long elongation distance and is suitable for covering a large area, especially a large sand mold or with more than two molding positions. Its main structure is divided into: moving It is composed of crane (fixed without crane), base, boom, boom slewing motor, boom conveying motor, sand mixing tank mixing motor, sand bucket, sand outlet and other parts. The boom is generally conveyed by a screw shaft (also has a belt type), the boom and the base, the boom and the forearm are connected by a slewing bearing, the rotation of the boom and the screw conveying shaft are driven by a motor; the rotation of the sand mixing tank is driven by a motor or Manually driven, the mixing shaft in the mixing tank is driven by a motor.

2.The main reasons for the vibration of the sand mixer
2.1 The uneven quality of the sand mixing shaft and the boom screw feed shaft, the uneven quality of the sand mixing shaft and the boom will cause the dynamic and static imbalance, and the imbalance of the rotary motor itself of the boom and the sand mixing tank, so that the sand is mixed after the motor rotates. The shaft will generate periodic excitation force, which will cause forced vibration of the sand mixing tank body or the boom, and will also cause the bearings at both ends of the sand mixing shaft or screw shaft to be subjected to lateral force, which will accelerate the bearing wear and aggravate the equipment vibration.

2.2 The axis of the sand mixing shaft, the boom screw conveyor and the motor are not concentric. If the sand mixing shaft and the motor drive pump are not concentric, the parallelism of the joint surface cannot meet the requirements (poor machining accuracy or installation does not meet the requirements), it will cause The clearance of the coupling fluctuates as the shaft rotates, resulting in the same periodic forced vibration as the mass unbalance. Its frequency and rotational speed are multiplied, and the amplitude depends on the eccentricity between the sand mixing shaft and the motor.

2.3 The uneven or large clearance of the large and small arm slewing bearings The equipment is a typical cantilever structure, and each level of connection is connected by the slewing bearing. If the slewing bearing clearance is too large, or the clearance is not If it is uniform, then in the operation of the equipment, under the action of the forced vibration force, the exciting force of the sand mixing tank will be transmitted to the boom and the base, and then the vibration of the boom and the sand mixing tank will be intensified. However, the slewing bearing is produced by a professional manufacturer, and is not the main adjustment object of vibration in daily assembly and debugging.

2.4 Tightening of the anchor bolts of the base. The equipment is a cantilever structure. If the anchor bolts are not tightened in place or are not uniformly tightened, it is easy to cause the bolts to loosen, which will reduce the ability of the equipment to resist forced vibration and aggravate the equipment. vibration.

3.The main countermeasures to control the vibration of the sand mixer
3.1 Control and adjustment measures for the unbalance of the sand mixing shaft The sand mixing shaft is processed by welding round steel at both ends of the steel pipe. can be accurately measured with a balancing machine, the specific method can be as follows:

3.11 When making the sand mixing shaft blank, the straightness of the blank should be ensured as much as possible to reduce the uneven quality after processing.

3.12 After the sand mixing shaft is processed, install the Bafang sleeve first. When installing the Bafang sleeve, pay attention to the angle of the Bafang sleeve. At the same time, it is forbidden to place the sand mixing shaft in the air during installation to avoid deformation of the sand mixing shaft.

3.13 After the Bafang set is installed, measure the balance of the sand mixing shaft. According to the measured balance, determine the thickness of the opposite surface to be removed. After processing, measure again until the static balance is qualified.

3.14 Measure and group all the blades before installing the blades. When installing the blades, pay attention to install the blades with the same quality on the symmetrical plane, and the lighter blades are close to the sand outlet side to avoid uneven quality of the blades. Uneven quality.

3.15 Carry out the static balance measurement again on the sand mixing shaft with the blade installed. At this time, the sand mixing shaft assembly can generally achieve static balance. For unbalanced, a flat pad can be added to the blade installation.

3.2 Control of the boom screw conveyor shaft
3.21 The straightness of the helical shaft shall be checked after the production of the boom helical shaft blank. If the deviation is large, it shall be straightened.

3.22 For the processed screw shaft, use a tooling (measuring sand mixing shaft tooling) or a balancer to measure the balance. For unbalanced ones, a counterweight can be welded at the rear end of the conveying blade until it is balanced.

3.3 Installation of the coupling
The couplings used in the boom of the sand mixer are all elastic pin couplings. This type of coupling can eliminate the different axial degrees at both ends of the coupling to a certain extent, but the two ends of the coupling are different. If the shaft is larger, it will accelerate the wear of the spring pin and cause greater vibration. Therefore, when installing the coupling, it must be aligned, and when tightening the pin nut, it must be divided into 3 symmetrical and counterclockwise directions. After 4 times of tightening in place, it not only ensures the coaxiality of the coupling, but also ensures that the elastic plunger of the coupling is filled in the coupling space without gap.

3.4 Installation of the base
When the base is installed, the base must be level, and it can be measured with a spirit level; when tightening the base bolts, do not tighten them at one time, but tighten the peripheral bolts symmetrically in two or three times. It is best to use a constant torque wrench for tightening. The last tightening of the torque wrench must be performed by one person to ensure the consistent pre-tightening force of the surrounding bolts.

3.5 Installation of slewing support
3.51 Before the slewing bearing is installed, it should be turned manually to ensure that the inner and outer rings rotate relatively flexibly and there is no jamming phenomenon;

3.52 When installing the slewing bearing, refer to the fastening method of the anchor bolts to avoid the change of the internal clearance of the slewing bearing due to the same pre-tightening force of the installation bolts.

3.6 Post-maintenance
After the equipment is in trial production for a period of time, it is necessary to check and re-tighten the main structural connecting bolts such as anchor bolts, slewing bearing installation bolts, and motor installation bolts to ensure that the connection parts of the equipment are connected reliably and without loosening.

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