CN111873192A - Tower type multi-group-blade combined cutter wheel, stone cutting machine and working method - Google Patents

Abstract

The invention relates to a tower-type multi-slice combined cutter wheel, a stone cutter and a working method, wherein the tower-type multi-slice combined cutter wheel is characterized in that it comprises a rotating main shaft and several groups sleeved on the rotating main shaft with diameters increasing in turn. For large saw blades, each group of saw blades has a plurality of saw blades that are arranged in parallel with each other and have the same diameter. The tower-type multi-group blade combination cutter wheel and the stone cutter of the invention are reasonably designed, the difference between the maximum diameter and the minimum diameter saw blade is small, the wear of the large and small diameter saw blades is uniform, and the trouble of frequently replacing the small diameter saw blades in the middle is reduced.

Description

Tower-type multi-piece combination cutter wheel, stone cutter and working method

Technical field:

The invention relates to a tower-type multi-slice combined cutter wheel, a stone cutter and a working method.

Background technique:

At present, stone cutters are widely used to cut stone into pieces. The saw blades used by the stone cutters include a cutter wheel formed by a combination of multiple saw blades of equal diameter and a spire-shaped cutter wheel formed by multiple saw blades of different diameters.

At present, the diameter of the saw blade in the spire-shaped cutter wheel varies from large to small, and the diameters are very different, so that the rotation speed of the main shaft cannot be the same as that of the large-diameter saw blade or the small-diameter saw blade. If the line speed is too large, the large-diameter saw blade is easily damaged, while for the large-diameter saw blade, the small-diameter saw blade wears more seriously, and the cutter head of the small-diameter saw blade needs to be replaced frequently, so usually only the speed of the middle-diameter saw blade can be used. Therefore, the cutting speed of the saw blade cannot be further improved. In addition, since the diameter of the small-diameter saw blade is only slightly larger than the diameter of the main shaft, frequent shutdowns are required during the entire lower-knife cutting process. The chip is removed, which also greatly affects the cutting efficiency.

In addition, in order to increase the strength of the cutter wheel, each saw blade is equipped with a lock and a rotating locking rod, such as Patent No. 201620057678.8, Invention Name: Saw Blade Locking Rod Positioning Assembly Structure, and Patent No. 201620057792.0, Invention Name: Saw Blade Group gap isolation and positioning structure. Although the above-mentioned patent adds components such as the lock-rotating locking rod to increase the cutting strength of the saw blade and the cutter wheel, the components such as the locking-rotating locking rod are complex in structure, difficult to process, high in cost, and are incompatible with each other. The assembly of the saw blade is cumbersome and time-consuming.

Invention content:

In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a tower-type multi-group blade combination cutter wheel and a stone cutter. The difference between saw blades is small, and the wear of saw blades with large and small diameters is consistent, which reduces the trouble of frequently replacing small-diameter saw blades in the middle.

The tower type multi-group blade combination cutter wheel of the present invention is characterized in that: it comprises a rotating main shaft and several groups of saw blades whose diameters increase sequentially, and are sleeved on the rotating main shaft. saw blade.

Further, the distance between the above-mentioned two adjacent saw blades is the same.

Further, each group of saw blades mentioned above has 2-10 saw blades, and the rotating spindle has 2-12 groups of saw blades.

Further, the above-mentioned saw blade has a through hole sleeved on the rotating spindle, and each through hole is provided with at least one key groove.

Further, the thickness of the above-mentioned saw blade is 1.2-3.0 mm.

Further, the diameter of the above-mentioned saw blade is 800-3000mm.

Further, a number of non-full circular positioning holes are arranged on the above-mentioned saw blades, and a locking rod for locking each saw blade is drilled in the non-full circular positioning holes of each saw blade, and the cross section of the locking rod is the same as the non-full circular positioning hole. The shape of the full-circle positioning holes is the same, and the locking rod is provided with slits for limiting saw blades at intervals, and the shaft segments in the slits can rotate in the non-full-circle positioning holes.

Further, the above-mentioned locking rod includes an intermediate locking segment rod body and a reduced diameter shaft segment rod body located at both ends of the intermediate locking segment rod body. The intermediate locking segment rod body is flattened on both sides of the circular shaft to form two platforms, and the two platforms are parallel to each other. , the slits are arranged on the rod body of the middle locking segment at equal intervals, the spacing between adjacent slits is the spacing between adjacent saw blades, and the cross-sectional shape of the shaft segment in the slit is circular.

Further, the cross-section of the above-mentioned non-full circular positioning hole is circular and lacks two inferior arcs, and chords are connected at the missing two inferior arcs, the two chords are parallel to each other, and the distance between the two chords is greater than or equal to the circle in the slit. The diameter of the shaft segment.

Further, a nut or a limiting piece is locked on the rod body of the diameter-reducing shaft section.

The stone cutter of the tower type multi-group blade combination cutter wheel of the present invention comprises a body and a spindle box arranged on the body, and is characterized in that: the tower type multi-group blade combination cutter wheel is arranged on the main body box.

The working method of the tower-type multi-group blade combination cutter wheel of the present invention is characterized in that: the tower-type multi-group blade combination cutter wheel comprises a rotating main shaft and several groups of saw blades whose diameters increase sequentially, each sleeved on the rotating main shaft. A group of saw blades has a plurality of saw blades arranged in parallel with each other and with the same diameter; when installing, a group of saw blades with the same diameter is formed, with spacers between each saw blade, and the diameter of each group of saw blades increases in turn , and insert each group of saw blades in turn from one side of the rotating spindle to form a tower-type multi-group blade combination cutter wheel.

Further, a number of non-full circular positioning holes are arranged on the above-mentioned saw blades, and a locking rod for locking each saw blade is drilled in the non-full circular positioning holes of each saw blade, and the cross section of the locking rod is the same as the non-full circular positioning hole. The shape of the full-circle positioning holes is the same, and there are slits for limiting saw blades on the locking rod. The shaft segments in the slits can be rotated in the non-full-circle positioning holes; The non-full circular positioning holes of each saw blade are adjusted to the coaxial position, and the lock rod is inserted into the non-full circular positioning hole. After the lock rod penetrates, each saw blade needs to face the kerf position. Rotate a certain angle so that the lock rod can no longer be pulled out, and fasten and fix with nuts at both ends of the lock rod.

The advantages of the tower-type multi-group blade combination cutter wheel of the present invention:

1. Because the difference between the largest and smallest saw blade diameters is small, it can basically ensure that the large and small saw blades wear uniformly, thereby reducing frequent replacement of small saw blades in the middle.

2. Due to the larger diameter of the minimum saw blade, the cutting speed and cutting efficiency are improved.

3. The tower-type multi-combination locking cutter wheel is equipped with a tower-type saw blade lock rotating rod (lock rod), which can achieve the overall stability of the saw blade, and can achieve two or more sets of ladder-type combination saws with the same diameter. chip installation.

4. The tower-type multi-combination locking cutter wheel can be installed with the thinnest saw blade thickness to 2.5mm, which can save materials, save energy and reduce waste powder discharge.

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Description of drawings:

Fig. 1 is the structural schematic diagram of the existing stone cutter and the cutter wheel on it;

Fig. 2 is the structural representation of the stone cutter of the present invention and the cutter wheel on it;

Fig. 3 is the structural schematic diagram of the cutter wheel of the present invention (omitting the rotating spindle);

Fig. 4 is the right side view of Fig. 3;

Figure 5 is a perspective view of a lock lever;

Figure 6 is a front view of the lock lever;

Fig. 7 is the A-A sectional view of Fig. 6;

Figure 8 is a front view of a specification saw blade;

Fig. 9 is the K part enlarged view of Fig. 8;

Figure 10 is a front sectional view of the inner and outer shaft combined cutter wheel structure;

Figures 11 and 12 are partial views of Figure 10;

FIG. 13 is a diagram of another embodiment of FIG. 3 .

Detailed ways:

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following specific embodiments are given and the accompanying drawings are described in detail as follows.

The tower-type multi-group blade combination cutter wheel of the present invention includes a rotating spindle 1 and several groups of saw blades with successively increased diameters sleeved on the rotating spindle 1 (the diameter values of the successively increased groups are preferably the same). Each group of saw blades There are a plurality of saw blades 2 arranged in parallel with each other and with the same diameter, each group of saw blades has 2-10 saw blades, and the rotating spindle has 2-12 groups of saw blades, the present application uses 4 saw blades in each group, a total of 7 groups It is a legend (as shown in Figure 3), where the diameter of the smallest diameter saw blade is 1050mm, the diameter of the adjacent group of saw blades is 100 mm apart, the diameter of the largest diameter group of saw blades is 1650 mm, and other diameters of saw blades are acceptable. The advantages of the structure are illustrated by the following work comparisons:

Every time the existing spire-shaped cutter wheel feeds along the axis of the rotating spindle (X direction in Figure 1), it is the center distance between adjacent saw blades (usually the value is 5-15mm), and the cutter wheel moves after the axial feed. To the end of the stone, cut the stone vertically with a certain fixed value (Z direction in Figure 1), and then move outward in the direction perpendicular to the surface of Figure 1 to cut the stone. When the cutter wheel moves to the front end of the stone, use a certain fixed value (usually the difference between the radii of adjacent saw blades) down the knife vertically (Z direction in Figure 1), continue to move inward to cut the stone in the direction perpendicular to the surface of Figure 1, and then move the cutter wheel along the axis of the rotating spindle (Figure 1). 1 X direction) feed, the feed value is the center distance between adjacent saw blades, and then cycle as described above, so when using the existing spire-shaped cutter wheel for machining, the number of feeds along the axis of the rotating spindle is the saw blade. The number of sheets, obviously the processing efficiency of this step and method is low.

The processing steps of the structure of the present application are as follows: first, the feed of the cutter wheel along the axis of the rotating spindle (X direction in FIG. 2 ) is the thickness of a group of saw blades (each group of saw blades has multiple pieces, and the feed value is 10- 100 mm); after the axial feed, the cutter wheel moves to the last end of the stone, and cuts down vertically (Z direction in Figure 2) at a fixed value (usually the difference between the radii of adjacent groups of saw blades), and then vertically Move the cutting stone outward in the direction of the picture in Figure 2. When the cutter wheel moves to the front end of the stone, it will cut down vertically with a certain fixed value (usually the difference between the radii of the adjacent saw blades) (Z direction in Figure 2) , continue to move inward to cut the stone in the direction perpendicular to the surface of Figure 2, and then the cutter wheel feeds along the axis of the rotating spindle (X direction in Figure 2), the feed value is the thickness of a group of saw blades, and then as before Therefore, when the tool wheel of the present application is used for processing, the number of tool feeds along the axis of the rotating spindle is obviously less than that of the existing turret tool wheel, and the processing efficiency is significantly improved.

In addition, the diameter of the saw blade in the current spire-shaped cutter wheel varies from large to small, and the diameters are very different, so that the rotation speed of the main shaft cannot be used for the large-diameter saw blade or the small-diameter saw blade. If the linear speed of the blade is too large, the large-diameter saw blade is easily damaged, while for the large-diameter saw blade, the small-diameter saw blade wears more seriously, and the cutter head of the small-diameter saw blade needs to be replaced frequently. In addition, since the diameter of the small-diameter saw blade is only slightly larger than the diameter of the main shaft, frequent shutdowns are required during the entire lower-knife cutting process. The saw blade is removed, which also greatly affects the cutting efficiency.

Since the difference between the maximum and minimum saw blade diameters is small, the application can basically ensure uniform wear of the large and small saw blades, thereby reducing frequent replacement of small saw blades in the middle; also because the diameter of the minimum saw blade is large, thereby improving the cutting speed and efficiency. Efficient cutting.

The above-mentioned rotating spindle is rotatably connected in the spindle box, each saw blade can be arranged on one end of the rotating spindle, and the other end drives the rotating spindle to rotate through a pulley mechanism.

The spacing between the above two adjacent saw blades is equal, so as to ensure multiple cutting, feeding and processing of stone pieces of equal thickness.

Further, in order to realize the synchronous rotation of each saw blade and the rotating main shaft, the above-mentioned saw blade has a through hole 3 sleeved on the rotating main shaft, and at least one key slot 4 is provided on the through hole, specifically 2-5. , the illustration in this application is that there are three key grooves 4 in the through hole, and corresponding convex keys are arranged on the rotating spindle.

The thickness of the above-mentioned saw blade in the present application is 1.2-3.0 mm, and the diameter of the saw blade is 800-3000 mm.

Several non-full circular positioning holes 5 (6-27 can be set on the saw blade) are arranged on the saw blade of the locking lever connection structure of the present application, and the non-full circular positioning holes 5 of each saw blade 2 are drilled through. There is a locking rod 6 for locking each saw blade 2, and the non-full circular positioning hole 5 can be an oval hole, a strip hole or the like.

The cross section of the locking rod 6 is equivalent to the shape of the non-full circular positioning hole, that is, the locking rod 6 can pass through the non-full circular positioning hole 5, and the locking rod 6 can also be oval or strip-shaped, etc. The upper interval is provided with a slit 7 for limiting the saw blade. The slit and the saw blade can be transition fit or small clearance fit. The shaft segment 8 in the slit is limited to rotate in the non-full circular positioning hole. The section of the shaft section 8 can be circular, etc., so that it can be rotated in a non-circular positioning hole. Of course, other shapes, such as rectangle or ellipse, can be used, but for the convenience of processing, the section of the shaft section 8 is a circle. shape.

The above-mentioned locking rod 6 includes an intermediate locking segment rod body 9 and a reduced diameter shaft segment rod body 10 located at both ends of the intermediate locking segment rod body. The intermediate locking segment rod body 9 is flattened on both sides of the circular shaft to form two platforms 11. Parallel to each other, the slits 7 are arranged on the middle locking segment rod body at equal intervals, the spacing between adjacent slits is the spacing between adjacent saw blades on the cutter wheel, and the cross-sectional shape of the shaft segment in the slit is a circle. shape etc.

Further, the above-mentioned non-full-circle positioning hole 5 has a circular cross-section and lacks two inferior arcs, and a chord 12 is connected at the missing two inferior arcs. The two chords are parallel to each other, and the distance between the two chords is greater than or equal to the slit. The diameter of the mid-circle shaft segment.

Further, a nut or a limiting piece is locked on the rod body of the diameter-reducing shaft section.

When machining the lock rod 6, the intermediate locking section rod body 9 and the reduced diameter shaft section rod body 10, which are both optical axes, can be turned first according to the size, and at the same time, a plurality of slits 7 can be turned at the same positioning station (or at the same time. The thread is machined on the rod body 10 of the reduced diameter shaft section), and all the slits 7 for positioning the saw blade are processed in the same positioning station, which not only has high processing efficiency and low cost, but also helps to ensure processing accuracy; The two platforms 11 are milled and flattened, and the processing of the lock rod 6 is basically completed. The lock rod 6 of the present application has a simple structure and an ingenious design, and is very convenient to disassemble and assemble with each saw blade. Only the lock rod 6 needs to pass through a non-full circle. After the positioning hole 5 is rotated 90 degrees and the nut is locked, the assembly of each saw blade and the disassembly of the locking rod are greatly facilitated when sawing stone, and the efficiency of sawing stone is improved.

The locking bar connection structure of the present application can be applied to the cutter wheel of multiple equal-diameter saw blades (as shown in Figure 13), and can also be applied to the tower-type multi-group blade combination cutter wheel of the present application (as shown in Figure 2-4). shown), can also be used in conventional spire-shaped cutter wheels.

The tower-type multi-slice combined cutter wheel stone cutter of the present invention includes a body A1 and a main shaft box A2 arranged on the main body.

The working method of the tower-type multi-group blade combination cutter wheel of the present invention, the tower-type multi-group blade combination cutter wheel comprises a rotating main shaft 1 and several groups of saw blades whose diameters increase sequentially, which are sleeved on the rotating main shaft 1. Each group of saw blades The blade has a plurality of saw blades 2 arranged in parallel with each other and with the same diameter. Each group of saw blades has 2-10 saw blades, and the rotating spindle has 2-12 groups of saw blades. This application uses 4 saw blades in each group, a total of 7 The group is an example in which the diameter of the smallest diameter saw blade is 1050mm, and the diameter of the adjacent group of saw blades differs by 100 mm; when installing, multiple saw blades with the same diameter are formed into a group of saw blades, and there are spacers 13 between the saw blades. The diameters of each group of saw blades increase in turn, and the diameters of the saw blades in each group of saw blades are equal.

Further, in order to facilitate installation, several non-full circular positioning holes 5 are arranged on the above-mentioned saw blades, and a locking rod 6 for locking each saw blade 2 is drilled in the non-full circular positioning holes 5 of each saw blade 2. , the non-full circular positioning hole 5 can be in the shape of an oval hole, a strip hole, etc.; when installing, adjust the non-full circular positioning hole of each saw blade on the rotating spindle to the coaxial position (each saw The sheet usually has one to three circles of non-circular positioning holes, each circle has multiple non-full-circular positioning holes, and the non-full-circular positioning holes are adjusted to the coaxial position even if the positions of the non-full-circular positioning holes are basically the same) , Insert the lock rod 6 into the non-full circular positioning hole 5. After the lock rod is penetrated, each saw blade needs to face the kerf 7 position. If it cannot be pulled out any more, the rod body 9 of the locking section in the middle of the two ends of the lock rod is locked and fixed with a nut.

The advantages of the tower-type multi-group blade combination cutter wheel of the present invention:

1. Because the difference between the largest and smallest saw blade diameters is small, it can basically ensure that the large and small saw blades wear uniformly, thereby reducing frequent replacement of small saw blades in the middle.

2. Due to the larger diameter of the minimum saw blade, the cutting speed and cutting efficiency are improved.

3. The tower-type multi-combination locking cutter wheel is equipped with a tower-type saw blade lock rotating rod (lock rod), which can achieve the overall stability of the saw blade, and can achieve two or more sets of ladder-type combination saws with the same diameter. chip installation.

4. The tower-type multi-combination locking cutter wheel can be installed with the thinnest saw blade thickness to 2.5mm, which can save materials, save energy and reduce waste powder discharge.

In addition, the cutter wheel of the present application can use the inner and outer shaft combined cutter wheel structure, so as to realize that the rotation speeds of some groups of saw blades are different, so as to reduce the resonance vibration.

The combined tool wheel structure of the inner and outer shafts of the present invention includes a spindle box A2, an outer rotating shaft A4 rotatably connected in the spindle box A2, and an inner rotating shaft A5 sleeved inside the outer rotating shaft A4 and rotatable independently. The outer rotating shaft is hinged to the spindle box through bearings. Inside A2, the outer shaft A4 is in the shape of a hollow tube, the inner shaft can be a solid shaft, and the first end A501 and the second end A502 of the inner shaft A5 both grow out of the first end A401 and the second end A402 of the outer shaft A4, respectively , the first end of the outer rotating shaft A4 and the first end of the inner rotating shaft A5 are fixedly connected with a plurality of saw blades arranged side by side at parallel intervals. The thickness of the saw blades is usually the same, and the spacing of the saw blades is usually the same. The diameter of the first saw blade A6 on the rotating shaft is different from the diameter of the second saw blade A7 located on the inner rotating shaft (the first saw blade can be several sets of saw blades of the aforementioned larger diameter, and the second saw blade can be the aforementioned smaller diameter. Several sets of saw blades); the second end of the outer shaft and the second end of the inner shaft are fixedly connected with pulleys, the diameter of the first pulley A8 on the outer shaft and the second pulley on the inner shaft are The diameters of A9 are different, so that the first saw blade A6 and the second saw blade A7 have different rotation speeds (saw blades with different rotation speeds can be connected to the lock lever respectively, or the smaller diameter saw blade can be installed without the lock lever, the saw blade and the saw There is a spacer between the blades), the first saw blade A6 and the second saw blade A7 have different rotational speeds, so that the first and second saw blades can generate different vibration frequencies, and the two different vibration frequencies are mutually reduced. , to avoid large resonance caused by the same frequency of all saw blades.

The working principle of the combined cutter wheel structure of the inner and outer shafts: different rotational speeds are provided to the outer shaft and the inner shaft through the power input device (motor and pulley mechanism), which is conducive to making the saw blades set on the inner shaft and the outer shaft respectively. Different vibration frequencies can be generated, and the two different vibration frequencies are mutually attenuated, avoiding the large resonance caused by the same frequency of all saw blades.

The inner and outer shaft combined cutter wheel of the present invention can avoid the resonance phenomenon, which is beneficial to improve the flatness of the stone cutting surface and the cutting efficiency of the stone, without the need for additional grinding processing in the follow-up, reducing energy consumption; at the same time, it can reduce the cutter head on the saw blade damage, improve the service life of the saw blade and reduce the cost.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should The specific embodiments of the invention are modified or some technical features are equivalently replaced; without departing from the spirit of the technical solutions of the present invention, all of them should be included in the scope of the technical solutions claimed in the present invention.

Claims (10)

1. A tower-type multi-group blade combination cutter wheel is characterized in that: comprising a rotating main shaft and several groups of saw blades whose diameters increase successively that are sleeved on the rotating main shaft, each group of saw blades has a plurality of blades arranged in parallel with each other and a diameter Same saw blade. 2. The tower-type multi-group blade combination cutter wheel according to claim 1, characterized in that: the spacing between two adjacent saw blades is the same; each group of saw blades has 2-10 saw blades, and the rotating spindle has 2 -12 sets of saw blades. 3. The tower-type multi-group blade combination cutter wheel according to claim 1, wherein the saw blade has a through hole sleeved on the rotating spindle, and at least one keyway is arranged on the through hole; The thickness of the saw blade is 1.2-3.0mm; the diameter of the saw blade is 800-3000mm. 4. The tower-type multi-group blade combination cutter wheel according to claim 1, wherein a plurality of non-full circular positioning holes are arranged on the saw blades, and in the non-full circular positioning holes of each saw blade A lock rod for locking each saw blade is provided, the cross section of the lock rod is equivalent to the shape of the non-full circular positioning hole, and the lock rod is spaced with a slit for limiting the saw blade, and the shaft section in the slit Can be rotated in non-full circular positioning holes. 5 . The tower-type multi-slice combination cutter wheel according to claim 4 , wherein the locking rod comprises an intermediate locking segment rod body and a reduced diameter shaft segment rod body located at both ends of the intermediate locking segment rod body, and the middle locking segment rod body is 5 . The locking segment rod body is flattened on both sides of the circular shaft to form two platforms, and the two platforms are parallel to each other. The slits are arranged on the middle locking segment rod body at equal intervals, and the spacing between adjacent slits is the adjacent saw blades. distance, the cross-sectional shape of the shaft segment in the slit is circular. 6. The tower-type multi-group blade combination cutter wheel according to claim 5, characterized in that: the cross-section of the non-full-circle positioning hole is circular and lacks two inferior arcs, and is connected with the missing two inferior arcs. Chord, the two chords are parallel to each other, and the distance between the two chords is greater than or equal to the diameter of the circular shaft segment in the slit. 7 . The tower-type multi-slice combined cutter wheel according to claim 5 , wherein a nut or a limiting piece is locked on the rod body of the diameter-reducing shaft section. 8 . 8. A stone cutter using any one of claims 1-7, comprising a body and a spindle box arranged on the body, characterized in that: the spindle box is provided with a tower-type multi-group cutter wheel. Slice combination cutter wheel. 9. A working method of a tower-type multi-group blade combination cutter wheel, characterized in that: the tower-type multi-group blade combination cutter wheel comprises a rotating main shaft and several groups of saw blades whose diameters increase sequentially, which are sleeved on the rotating main shaft. , each group of saw blades has a plurality of saw blades with the same diameter arranged in parallel with each other; when installing, a group of saw blades with the same diameter is formed, and there are spacers between the saw blades, and the diameters of the saw blades of each group are sequentially increase, and insert each group of saw blades in turn from one side of the rotating spindle to form a tower-type multi-group blade combination cutter wheel. 10. The working method of the tower-type multi-group blade combination cutter wheel according to claim 9, wherein the saw blade is provided with a number of non-full circular positioning holes, and the non-full circular positioning holes of each saw blade are arranged. The hole is provided with a lock rod for locking each saw blade. The cross section of the lock rod is equivalent to the shape of the non-full circular positioning hole, and the lock rod is provided with a slit for limiting the saw blade. The shaft segment can be rotated in the non-circular positioning hole; when installing, adjust the non-circular positioning holes of each saw blade on the rotating spindle to the coaxial position, and insert the lock rod into the non-circular positioning hole , After the lock rod is penetrated, each saw blade needs to face the kerf position. After the lock rod is completely penetrated, rotate a certain angle so that the lock rod can no longer be pulled out, and the two ends of the lock rod are locked and fixed with nuts.

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