Method for using a passive anti-kickback device for a cold saw

Abstract

This invention discloses a device for passively preventing saw blade clamping in a cold saw machine, comprising a vertical pressing mechanism, a horizontal thrust pressing device, and a horizontal stop device. Two vertical pressing mechanisms are positioned above the roller conveyor, each close to the working position of one saw blade. These mechanisms are fixed to the workshop floor via anchor bolts. Four horizontal thrust pressing devices are positioned on the same side of the saw blade, with two of them longitudinally positioned between the two saw blades. Each horizontal thrust pressing device is fixed to the machine frame via a support I. Several horizontal stop devices are positioned on the opposite side of the saw blade and are fixed to the machine frame via brackets. This invention stabilizes the stress between the steel section and the saw blade, keeping the kerf open and passively preventing saw blade clamping. This invention is particularly suitable for cold sawing of single steel sections and sections with a small number of sections.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical machinery and equipment technology, and further to the field of rolling processing equipment technology. Specifically, it relates to a device that is simple in structure, easy to adjust, reliable in use, and actively prevents the saw blade from getting stuck in a cold saw. Background Technology

[0002] The cold saw machine is a key piece of equipment in the profile production line, its function being to cut profiles to the required length. The saw blade is a consumable spare part; during normal production, the saw blade needs to be replaced after a certain number of cuts due to wear. The replaced saw blade can be reused after re-sharpening the cutting edges. The main reason for rapid saw blade wear is that the saw blade gets caught during the sawing process. This catching phenomenon frequently occurs during profile sawing. The reason for this is that the kerf between the profile being cut and the far end of the saw blade teeth tends to narrow, generating compressive stress on the side surface of the saw blade. During the sawing process, the profile being cut presses against one or both sides of the saw blade, increasing friction and sawing resistance. Unilateral pressure and catching can also cause axial load imbalance on the cold saw blade, increased vibration, and even spindle deformation. Saw blade catching in the cold saw machine directly leads to rapid saw blade heating, making it prone to thermal fatigue cracks, saw blade breakage, and accelerated wear, preventing the saw blade from reaching its required service life. This not only directly affects production efficiency, increases saw blade consumption, and raises production costs, but also makes the motor that drives the saw blade prone to overcurrent and overload, even overheating or overload tripping, seriously affecting the sawing production of the cold saw machine. Therefore, researching and developing a device that is simple in structure, easy to adjust, and reliable in use to passively prevent the saw blade from getting stuck in the cold saw machine is the key to solving this problem. Summary of the Invention

[0003] The purpose of this invention is to provide a device that is simple in structure, easy to adjust, reliable in use, and passively prevents the saw blade from getting stuck in a cold saw.

[0004] The objective of this invention is achieved as follows: It includes a vertical pressing mechanism, a horizontal thrust pressing device, and a horizontal stop device. Two vertical pressing mechanisms are positioned above the roller conveyor; each mechanism is located close to the working position of one of the two saw blades; the vertical pressing mechanisms are fixed to the workshop floor via anchor bolts. Four horizontal thrust pressing devices are positioned on the same side of the saw blades; two of these devices are longitudinally located between the two saw blades; the horizontal thrust pressing devices are fixed to the frame via support I. Several horizontal stop devices are positioned on the opposite side of the saw blades; the horizontal stop devices are fixed to the frame via brackets.

[0005] This invention comprises a vertical pressing mechanism, a horizontal thrust pressing device, and a horizontal stop device. The vertical pressing mechanism is equipped with a vertical pressing cylinder, a vertical guide rod, and a pressure plate. Guided by the vertical guide rod, the pressure plate remains horizontal during lifting and lowering, ensuring good contact with the structural steel. The horizontal stop device includes a square-headed drive screw, a locking nut, a horizontal guide rod, a stop, and a roller. When the stop position is properly adjusted, the locking nut can be used to lock the square-headed drive screw, thereby locking the stop position and subsequently locking the roller position. The roller contacts the structural steel, facilitating the conveying and guiding of the structural steel and preventing friction and wear.

[0006] This invention maintains stable stress between the steel section and the saw blade by adjusting the distance difference between each horizontal stop device and the center line of the roller conveyor, as well as the thrust of the horizontal thrust pressing device. This keeps the saw kerf open and passively prevents and avoids saw blade clamping. It avoids axial load imbalance of the saw blade caused by clamping the saw blade on one or both sides, resulting in a more uniform axial force distribution. It also reduces the vibration amplitude of the saw blade during high-speed rotation, reduces the increased heat generated by the clamped saw blade, and reduces cracking and damage that may lead to scrapping. This reduces saw blade wear, extends service life, and reduces the frequency of saw blade replacement.

[0007] This invention is more suitable for cold sawing of single strips and a small number of structural steel sections.

[0008] The working process of this invention is as follows:

[0009] 1. Adjust the square-headed transmission screw in the horizontal stop device, and adjust the horizontal stop device that is arranged close to the two saw blades of the cold saw to keep the line connecting the horizontal stop device and the contact part of the steel section perpendicular to the saw blade, and lock the position with the lock nut.

[0010] 2. The steel sections to be sawed are conveyed onto the sawing roller conveyor, and the length-fixing baffle or cutting head baffle is in place to position the steel sections to be sawed on the roller conveyor according to their length.

[0011] 3. The horizontal thrust pressing device pushes the steel section located on the sawing roller table toward multiple horizontal stop devices and applies a certain horizontal pressure.

[0012] 4. The vertical pressing cylinder of the vertical pressing mechanism extends, and the pressing plate moves axially along the vertical guide rods on both sides. The pressing plate presses down on the steel section to be cut from top to bottom, preventing the steel section from moving on the conveyor roller. The vertical guide rods on both sides of the vertical pressing mechanism enable the pressing plate to maintain balance and stability, as well as balance and stability of the vertical pressing force on the steel section.

[0013] 5. Press Figure 1 As shown in the cutting direction, start the cold saw blade to begin cutting. At this time, under the horizontal thrust of the horizontal thrust pressing device, tensile stress is generated at the kerf position of the steel section during the sawing process to maintain the kerf opening tendency and prevent and avoid saw blade jamming.

[0014] 6. When saw blade jamming still occurs, do not adjust the position of the horizontal stop devices that are arranged close to the two saw blades on the cold saw. Move the remaining horizontal stop devices back 5-50mm, so that the remaining horizontal block devices are 5-50mm further away from the center line of the roller conveyor. After the saw blade jamming phenomenon is eliminated, lock the position with the lock nut to ensure that there is enough distance for the steel to be sawed to generate deformation tendency and tensile stress, so as to maintain the tendency of the steel kerf to open and to prevent and avoid saw blade jamming.

[0015] 7. Tighten the square-headed drive screws in all horizontal stop devices with lock nuts to prevent position changes.

[0016] The present invention has the following effects:

[0017] 1. It prevents and avoids the saw blade getting stuck during the steel sawing process, as well as the increased sawing resistance caused by friction on the side of the saw blade.

[0018] 2. It prevents and avoids the axial load imbalance of the cold saw blade caused by the side pressing against the saw blade, which increases vibration and leads to spindle deformation.

[0019] 3. It prevents and avoids the saw blade from overheating and rapidly rising in temperature, as well as the easy occurrence of thermal fatigue cracks and early damage to the saw blade, thereby increasing the number of times the saw blade can be used on the machine and extending its service life, and reducing saw blade consumption.

[0020] 4. Prevent and avoid situations where the saw blade is clamped in the cold saw machine, causing overcurrent and overload, or even overheating or overload tripping of the saw blade drive motor, which seriously affects the normal production of the cold saw machine.

[0021] 5. The saw blade can be used more frequently on the machine, reducing the number of times the saw blade needs to be replaced during a shift and the downtime, thus increasing the effective working time.

[0022] This invention has a simple structure, is easy to adjust, and is reliable in use, and can passively prevent saw blade jamming. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 for Figure 1 Top view diagram;

[0025] Figure 3 This is a schematic diagram of the vertical pressing mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the horizontal thrust pressing device and the horizontal stop device of the present invention.

[0027] Figure 5 This is a schematic diagram of the horizontal stop device of the present invention.

[0028] In the diagram: 1-Vertical pressing mechanism, 101-Vertical pressing cylinder, 102-Vertical guide rod, 103-Pressure plate, 104-C-shaped frame, 2-Horizontal thrust pressing device, 201-Horizontal thrust pressing cylinder, 202-Support I, 3-Horizontal stop device, 301-Square head transmission screw, 302-Locking nut, 303-Horizontal guide rod, 304-Stop, 305-Bracket, 306-Roller, 4-Saw blade, 5-Frame, 6-Roller conveyor, 7-Structure steel, 8-Workshop floor. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings, but this is not intended to limit the present invention in any way. Any modifications made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0030] like Figures 1-5 As shown, the present invention includes a vertical pressing mechanism 1, a horizontal thrust pressing device 2, and a horizontal stop device 3. There are two vertical pressing mechanisms 1, which are positioned above the roller conveyor 6. The two vertical pressing mechanisms 1 are respectively located near the working positions of the two saw blades 4. The vertical pressing mechanisms 1 are fixed to the workshop floor 8 via anchor bolts. There are four horizontal thrust pressing devices 2, which are positioned on the same side of the saw blades 4. Two of the horizontal thrust pressing devices 2 are longitudinally located between the two saw blades 4. The horizontal thrust pressing devices 2 are fixed to the frame 5 via supports I. Several horizontal stop devices 3 are positioned on the opposite side of the saw blades 4. The horizontal stop devices 3 are fixed to the frame 5 via brackets.

[0031] The line connecting the blocks of the plurality of horizontal stop devices 3 is parallel to the longitudinal center line of the roller conveyor 6 and perpendicular to the sawing direction of the saw blade 4.

[0032] Two horizontal stop devices 3 are symmetrically arranged near the opposite side of the saw blade 4. After the positions of the horizontal stop devices 3 arranged close to each other on the two saw blades 4 of the cold saw are fixed, the remaining horizontal stop devices 3 are moved back 5~50mm, and the remaining horizontal stop devices 3 are 5~50mm further away from the center line of the roller conveyor.

[0033] The vertical pressing mechanism 1 includes a vertical pressing cylinder 101, a vertical guide rod 102, a pressure plate 103, and a C-shaped frame 104. The vertical pressing cylinder 101 is installed on the upper crossbeam of the C-shaped frame 104 at the center position corresponding to the roller conveyor 6. One vertical guide rod 102 is symmetrically arranged on the upper crossbeam of the C-shaped frame 104 with the vertical pressing cylinder 101 as the center. The pressure plate 103 is located above the section steel 7. The upper end face of the pressure plate 103 is fixedly connected to the lower end of the vertical pressing cylinder 101 and the vertical guide rod 102, respectively.

[0034] The vertical pressing cylinder 101 is hydraulically driven or pneumatically driven.

[0035] The vertical guide rod 102 is a circular guide rod.

[0036] The horizontal thrust pressing device 2 includes a horizontal thrust pressing cylinder 201 and a support I 202; the horizontal thrust pressing cylinder 201 is fixedly connected to the support I 202; the support I 202 is welded or bolted to the frame 5.

[0037] The horizontal thrust cylinder 201 is hydraulically or pneumatically driven.

[0038] The horizontal stop device 3 includes a square-headed drive screw 301, a locking nut 302, a horizontal guide rod 303, a stop 304, a bracket 305, and a roller 306. The square-headed drive screw 301 is positioned at the center of the upper part of the bracket 305. The locking nut 302 is provided at the square end of the square-headed drive screw 301. One horizontal guide rod 303 is symmetrically arranged on the left and right sides of the upper part of the bracket 305, with the square-headed drive screw 301 as the center. The stop 304 is disposed on the square-headed drive screw 301 and the horizontal guide rod 303. The roller 306 is disposed on the upper part of the stop 304. The bracket 305 is welded or bolted to the frame 5.

[0039] The horizontal guide rod 303 is a circular guide rod.

[0040] Working principle and process of this invention:

[0041] This invention maintains stable stress between the steel section 7 and the saw blade 4 by adjusting the distance difference between each horizontal stop device 3 and the center line of the roller conveyor 6 and the thrust of the horizontal thrust pressing device 2, thus keeping the saw kerf open. This passively prevents and avoids saw blade 4 from getting stuck, avoids axial load imbalance of the saw blade 4 caused by pressure on one or both sides, results in a more uniform axial force distribution, reduces the vibration amplitude of the saw blade 4 during high-speed rotation, and reduces the increased heat generated by the saw blade 4, as well as cracking and damage, thereby reducing saw blade 4 wear, extending its service life, and reducing the frequency of saw blade 4 replacement.

[0042] This invention is more suitable for cold sawing of single strips and a small number of 7-section steel sections.

[0043] The working process of this invention is as follows:

[0044] 1. Adjust the square-headed transmission screw 301 in the horizontal stop device 3, and adjust the horizontal stop device 3 arranged close to the two saw blades 4 of the cold saw machine so that the line connecting the horizontal stop device 3 and the section steel 7 is perpendicular to the saw blade 4, and lock the position with the lock nut 302.

[0045] 2. The steel section 7 to be sawed is conveyed onto the sawing roller conveyor 6, and the length-fixing baffle or cutting head baffle is in place to position the steel section 7 to be sawed on the roller conveyor 6.

[0046] 3. The horizontal thrust pressing device 2 pushes the steel section 7 located on the sawing roller table 6 towards the multiple horizontal stop devices 3 and applies a certain horizontal pressure.

[0047] 4. The vertical pressing cylinder 101 of the vertical pressing mechanism 1 extends, and the pressing plate moves axially along the vertical guide rods 102 on both sides. The pressing plate 103 presses down on the steel section 7 to be cut from top to bottom, preventing the steel section 7 from moving on the conveyor roller 6. The vertical guide rods 101 on both sides of the vertical pressing mechanism 1 enable the pressing plate 103 to maintain balance and stability, as well as balance and stability of the vertical pressing force on the steel section 7.

[0048] 5. Press Figure 1 In the indicated sawing direction, start the cold saw blade 4 to begin sawing. At this time, under the horizontal thrust of the horizontal thrust pressing device 2, tensile stress is generated at the saw kerf position of the steel section 7 during the sawing process to maintain the saw kerf opening tendency and prevent and avoid the saw blade 4 from getting stuck.

[0049] 6. When saw blade 4 is still stuck, the position of the horizontal stop device 3 arranged close to the two saw blades 4 of the cold saw machine is not adjusted. The remaining horizontal stop devices 3 are moved back 5~50mm, so that the remaining horizontal stop devices 3 are 5~50mm further away from the center line of the roller conveyor. After the saw blade 4 is eliminated, the position is locked with the locking nut 302 to ensure that there is enough distance for the steel section 7 to be sawed to generate deformation tendency and tensile stress, so as to maintain the tendency of the saw kerf of the steel section 7 to open, and to prevent and avoid saw blade 4 from happening.

[0050] 7. Tighten the square-headed transmission screws 301 in all horizontal stop devices 3 with lock nuts 302 to prevent position changes.

Claims

1. A method for using a passive anti-saw blade clamping device for a cold saw machine, the device comprising a vertical pressing mechanism (1), a horizontal thrust pressing device (2), and a horizontal stop device (3); characterized in that, There are two vertical pressing mechanisms (1), which are set above the roller conveyor (6). The two vertical pressing mechanisms (1) are respectively close to the working positions of the two saw blades (4). The vertical pressing mechanism (1) is fixed to the workshop floor (8) by anchor bolts. The horizontal thrust pressing device (2) includes a horizontal thrust pressing cylinder (201) and a support I (202). There are four horizontal thrust pressing devices (2), which are set on the same side of the saw blades (4). Two of the horizontal thrust pressing devices (2) are located longitudinally between the two saw blades (4). The device (2) is fixed to the frame (5) via support I (202); the horizontal stop device (3) includes a square-headed drive screw (301), a locking nut (302), a horizontal guide rod (303), a stop (304), a bracket (305), and a roller (306). The square-headed drive screw (301) is set at the upper center of the bracket (305), and the locking nut (302) is set at the square end of the square-headed drive screw (301); the upper part of the bracket (305) is symmetrically arranged with the square-headed drive screw (301) as the center. One horizontal guide rod (303) is provided; the stop block (304) is provided on the square-headed transmission screw (301) and the horizontal guide rod (303), and a roller (306) is provided on the upper part of the stop block (304); several horizontal stop block devices (3) are provided on the opposite side of the two saw blades (4), wherein two horizontal stop block devices (3) are symmetrically provided near the opposite side of the saw blades (4); the horizontal stop block device (3) is fixedly connected to the frame (5) through the bracket (305); the vertical pressing mechanism (1) includes a vertical pressing cylinder (101) and a vertical guide rod (103). 2) Pressure plate (103) and C-shaped frame (104); A vertical pressing cylinder (101) is set on the upper crossbeam of the C-shaped frame (104) at the center position of the roller conveyor (6). On the upper crossbeam of the C-shaped frame (104), one vertical guide rod (102) is symmetrically set on the left and right sides with the vertical pressing cylinder (101) as the center; The pressure plate (103) is located above the section steel (7), and the upper end face of the pressure plate (103) is fixedly connected to the lower end of the vertical pressing cylinder (101) and the vertical guide rod (102) respectively; The method of use includes the following steps: S1. Adjust the square-headed transmission screw (301) in the horizontal stop device (3), adjust the horizontal stop device (3) which is arranged close to the two saw blades (4) of the cold saw machine, so that the line connecting the horizontal stop device (3) and the section steel (7) is perpendicular to the saw blade (4), and lock the position with the lock nut (302). S2. The steel section (7) to be cut is conveyed onto the roller conveyor (6), and the length-fixed baffle or cutting head baffle is in place, so that the steel section (7) to be cut is positioned on the roller conveyor (6) according to its length. S3, the horizontal thrust pressing device (2) pushes the steel section (7) located on the roller conveyor (6) towards multiple horizontal stop devices (3) and applies a certain horizontal pressure; S4. The vertical pressing cylinder (101) of the vertical pressing mechanism (1) extends out, the pressing plate moves axially along the vertical guide rods (102) on both sides, and the pressing plate (103) presses down on the steel section (7) to be sawed from top to bottom. S5. Start the cold saw blade (4) to start sawing. At this time, under the action of the horizontal thrust of the horizontal thrust pressing device (2), the steel section (7) in the sawing process generates tensile stress at the saw kerf position to maintain the saw kerf opening trend. S6. When saw blade jamming occurs, the position of the horizontal stop device (3) arranged close to the two saw blades (4) of the cold saw machine is not adjusted. The other horizontal stop devices (3) are moved back 5~50mm, so that the other horizontal stop devices (3) are 5~50mm further away from the center line of the roller conveyor. After the saw blade jamming phenomenon is eliminated, the position is locked with the locking nut (302).

2. The method of use according to claim 1, characterized in that, The vertical pressing cylinder (101) is hydraulically driven or pneumatically driven.

3. The method of use according to claim 1, characterized in that, The vertical guide rod (102) is a circular guide rod.

4. The method of use according to claim 1, characterized in that, The horizontal thrust cylinder (201) is fixedly connected to the support I (202), and the support I (202) is welded or bolted to the frame (5).

5. The method of use according to claim 1, characterized in that, The horizontal thrust cylinder (201) is hydraulically or pneumatically driven.

6. The method of use according to claim 1, characterized in that, The bracket (305) is welded or bolted to the frame (5).

7. The method of use according to claim 1, characterized in that, The horizontal guide rod (303) is a circular guide rod.

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