The torsion moment generated by the resistance of the block material during the sawing process on the cutter shaft can be decomposed into the vertical upward top support force and the horizontal direction torsional moment. Both moments pass through the cutter shaft, and the slide plate acts on the cross beam. Then pass to the two columns to bear. Because the slide rails of the slide box are mostly designed to be long, the bearing point of the horizontal torsion is large, so the bearing capacity of the horizontal moment is also large, the beam is generally narrow, and the two rails on the beam are used as the vertical top moment. The force fulcrum distance is narrower, so the ability to withstand the top moment is poor. However, the saw blade head and the slide box of this type of saw have a relatively large weight, and are generally sufficient to withstand the horizontal force and the supporting torque. To prevent the top, the anti-top roller is arranged under the saw box. Once the topping force is too large and greater than the sum of the weights of the pressing, if the slide rails of the slide box are not restricted by the supporting rollers, they will be disengaged from the upper rail and contact with the rail surface of the beam, so that the supporting wheel can prevent the top. The role of the slide rails is ensured, so that stable sawing can be achieved. When such a sawing machine is equipped with more combined saw blades, such as when the topping force exceeds the weight of the lower pressing force to cause the topping phenomenon to cause the sliding plate to vibrate, it is necessary to adjust the loading and unloading at the right time, and it must be adjusted to the lower rail of the beam. When the contact is made, the support wheel rotates with the movement of the slide box. However, the pressure on the supporting roller cannot be adjusted too tightly, otherwise the resistance of the sliding rail will be increased. Therefore, it is necessary to properly adjust the top force of the supporting roller so that it can rotate the surface freely with the movement of the sliding rail and the top is not tight, and the top does not die.
The cutter shaft of the saw is also cantilevered. As the number of saw blades increases, the overhang weight and the length of the boom increase, and the deformation of the cutter shaft also increases, which will cause the saw blade to yaw and increase vibration, affecting the saw. Cut the effect. Therefore, the number of combined saw blades on such saws is also limited.
Of course, this type of machine is used as a single-piece saw or a small number of small-sized saw blades. The sawing effect is still very good, so it is widely used by the plate factory and the stone factory. This is also the most basic type of stone sawing. model.
Compared with the gantry sawing machine, the single-column sawing machine has different bearing capacities, but the cantilever structure of the cutter shaft is a common feature. Therefore, the use as a combination saw and the development in the direction of a multi-saw combination is equally limited by the structural form.
3, four-column frame saw
Most of the saws of this type are combined saws, especially large-scale combination saws, which are almost entirely constructed, because the four columns and the frames connected above and below form an extremely stable foundation. Moreover, the column is high, the beam is long, the stringer is wide, and it can be cut into large blocks. The cutter shaft adopts a multi-support structure with non-cantilever, and the distance between the bearing points in the longitudinal and lateral directions of the cutter seat is large, and there is no deflection torque, and the force is uniform, so that more saw blades can be installed. For example, a large group saw can hold 70 knives, and a domestic machine can also install 30 knives. This large-scale block material can be loaded with high efficiency, high-quality multi-level sawing, and the best sawing parameters can be selected according to different block specifications and materials. If the frequency conversion speed regulation can be used to easily change the saw blade speed and the cutter speed, the feed amount and the slice shift can be accurately controlled. The main sawing parameters are controlled by the computer to control the digital or screen display, and the sawing is completed automatically. process.
As a combination saw, it can be said that this type of machine is the most ideal, but the expensive price is also unacceptable to the majority of users. Take 30 saws as an example, the import price is between 1.5 million yuan and 2 million yuan, and the price of domestically produced machines is between 200,000 yuan and 300,000 yuan. Therefore, most of these models are foreign-funded, joint venture or large-scale export plates. Manufacturers choose.
Second, equipment requirements, adjustments and use
1. The machine equipment should be balanced and the vibration should be small.
Repeated impact of the diamond saw blade due to vibration will result in damage, shedding or abnormal wear of the diamond bit. Therefore, the fastening of each joint of the mechanical equipment and the fixing of the bulk clamp are essential. Therefore, it is necessary to reduce the vibration during sawing to ensure the normal and smooth operation of the equipment.
2, cutter shaft accuracy and wear resistance
The cutter shaft is the reference for installing the saw blade, and the accuracy of the cutter generally determines the mounting accuracy of the saw blade. When the saw blade is mounted and removed, the repeated friction of the saw blade on the shaft can easily cause wear or scratch damage of the cutter shaft, especially after long-term use of the equipment. Therefore, it is necessary to ensure that the accuracy of the cutter shaft does not change greatly. In addition to the necessary inspection and adjustment of the mounting accuracy of the cutter shaft, the selection, heat treatment and surface treatment of the cutter shaft are also important. The group saw blade shaft we produce is made of alloy steel. In addition to the quenching and tempering treatment to ensure that the cutter shaft has good rigidity and is not easy to deform, the surface deep layer is also subjected to super-audio quenching treatment (higher frequency quenching hard layer depth). The outer surface is then hard chrome plated and finally ground by a grinding machine. The surface of the cutter shaft processed by this method is smooth, non-corrosive, high in hardness (HRC60 or above), hard layer thick, not easy to wear and scratch damage, and can ensure high precision of the cutter shaft after long-term use.
3. Inspection and adjustment of the accuracy of the cutter shaft (see Figure 1)
(1) Slowly rotate the cutter shaft and use a dial indicator to test that the following indicators are required:
The radial runout of the cutter shaft A≤0.04mm;
The outer surface of the pad jumps B≤0.05mm
(2) Detecting the level of the cutter shaft with a frame level
In the full length range, C≤0.04mm (only the upper limit is applied). If the ratio exceeds the ratio, the seat support (or sawing head) can be adjusted to the level of the cutter axis within the tolerance range.
(3) The perpendicularity of the cutter axis to the beam guide shaft or the trolley track
The intersection of the cutter shaft and the beam guide rail is out of tolerance, that is, the deviation angle of the saw blade relative to the sawing plane of the block material is too wide, which will cause the upper seam of the block material to be super wide. When there is a large difference, the problem that the sawn hair plate appears thin and thick (commonly known as the axe plate) can be judged to be caused by the vertical crossing of the tool axis guide rail, which must be adjusted and corrected.
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Water level sensor, alose called hydrostatic pressure level sensors, submersible level sensors, which are submersible level sensors used for measuring the level of liquids (including corrosive liquids) in deep tanks or water in reservoirs. It provide accuracy and reliability across a wide range of applications. Based on the principle that the measured liquid static pressure is proportional to the height of the liquid, the advanced isolation type diffusion silicon sensor or ceramic capacitive Pressure Sensor is used to convert the static pressure into electrical signals, and then through temperature compensation and linear correction, into standard electrical signals (generally 4-20mA/1-5VDC).
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Xi'an Gavin Electronic Technology Co., Ltd , https://www.gamicos-meas.com