Floating type chamfering device and control method thereof

Abstract

The invention discloses a floating type chamfering device which comprises a rotating pair wheel used for driving round steel to rotate; the grinding head and the air bag floating mechanism are arranged on one side of the rotating pair wheel, the grinding head is used for chamfering the rotating round steel, and the air bag floating mechanism is used for driving the grinding head to float up and down through an air bag driving swing shaft; the flat supporting mechanism is arranged below the rotating pair wheel and used for supporting the round steel to leave the grinding head; and the stopping mechanism is arranged above the swing shaft, comprises a telescopic and adjustable stopping head and a driving mechanism of the stopping head, and is used for limiting the lifting of the grinding head. The invention further discloses a control method of the floating type chamfering device. Through the design of the stop mechanism, the grinding head can be prevented from being in contact with the round steel before the grinding head follows the round steel, the advantage of uniform chamfering of the floating type chamfering machine is fully played, and the defect that chamfering pits are generated is overcome; in addition, the maximum extending distance of the grinding head can be flexibly controlled, and the chamfering device is suitable for chamfering occasions of grinding wheels with different diameters and round steel with different specifications.

Description

Technical Field

[0001] The present invention relates to chamfering technology, and in particular to a floating chamfering device and a control method thereof. Background Art

[0002] Chamfering equipment is widely used in the finishing industry of round steel in the metallurgical industry. Burrs at the ends of round steel are removed by a chamfering machine to form an obtuse angle, avoiding defects in subsequent processing, such as avoiding the formation of folds by burrs during forging and avoiding damage to the turning and peeling machine by burrs. Since each round steel needs to be chamfered, chamfering is an important process in the finishing of round steel. Chamfering machines can be divided into fixed chamfering machines and floating chamfering machines according to whether the grinding heads are fixed. The fixed chamfering machine has a relatively simple structure, but when the round steel is slightly bent, the chamfering will be uneven, and it is only suitable for materials with very good straightness.

[0003] The technological process of the floating chamfering machine is as follows: the round steel enters the loading bench of the chamfering machine, the loading mechanism pushes the round steel into the alignment roller path, the alignment roller path aligns one end of the round steel, and the flat tray type stepping mechanism translates the round steel to the pair wheel rotating roller path. The pair wheel rotation makes the round steel rotate, and at the same time, the grinding head of the chamfering machine rotates to grind and chamfer the corner of the end of the round steel. After chamfering, the flat tray type stepping mechanism translates the round steel to the next alignment roller path to align the other end, and the chamfering process of the other end is the same as that of the first end. After chamfering both ends, the flat tray type stepping mechanism translates the round steel to the unloading bench to complete chamfering. The main equipment of the floating chamfering machine includes: alignment roller path, pair wheel rotating roller path, stepping mechanism for moving the round steel, chamfering main machine, etc. Among them, the chamfering main machine includes: swing shaft, grinding wheel head installed on the swing shaft, airbag installed between the base and the swing shaft to apply pressure to the grinding head, pipeline and air valve for providing air pressure, grinding head drive motor, and motor and its transmission device for adjusting the up and down position and front and back position of the grinding head.

[0004] The deficiencies of the existing floating chamfering machine are as follows: the grinding head of the floating chamfering machine is attached to the end of the round steel with a certain pressure. When the round steel swings up and down during rotation due to slight bending at the end, the grinding head also floats up and down against the corner of the round steel, so the chamfering width and depth are evenly distributed. However, the floating chamfering machine will have the quality problem of end pits, that is, chamfering pits. The main reason is that when the width and depth of the end chamfering reach the target, after the flat tray mechanism lifts the round steel away from the grinding head, the round steel has stopped rotating on the flat tray rod, while the rotating grinding head is accelerated to lift up and chase the round steel under the action of the airbag, so grinding is carried out again at the end of the round steel and grinding pits are generated. Summary of the Invention

[0005] In order to solve the above problems of the existing technology, the present invention provides a floating chamfering device and a control method thereof, which can avoid the grinding head chasing the round steel at the end of chamfering, effectively avoiding chamfering pits.

[0006] On the one hand, a floating chamfering device includes:

[0007] A rotating pair of wheels for driving the round steel to rotate;

[0008] A grinding head and its airbag floating mechanism are arranged on one side of the rotating pair of wheels. The grinding head is used to chamfer the rotating round steel, and the airbag floating mechanism drives the swing shaft through the airbag to drive the grinding head to float up and down;

[0009] A flat supporting mechanism is arranged below the rotating pair of wheels to lift the round steel away from the grinding head;

[0010] It is characterized in that it further includes:

[0011] A stop mechanism is arranged above the swing shaft, including a telescopically adjustable stop head and its driving mechanism, used to limit the upward movement of the grinding head.

[0012] The driving mechanism is a hydraulic driving type, or an electric motor driving type, or a manual mechanical structure.

[0013] The stroke L of the stop head descending to the working position is L = L0 - L1 - L2, where:

[0014] L0 is the stroke of the stop head descending to the working position when the grinding head installs a new grinding wheel to chamfer the smallest specification round steel, which is actually obtained through tests; after the specification of the round steel to be chamfered changes, or after the diameter of the grinding wheel on the grinding head becomes smaller after chamfering for a period of time, the stroke L of the stop head descending to the working position decreases accordingly;

[0015]

[0016] L2 is the influencing factor of the grinding wheel diameter, L2 = (new grinding wheel diameter - measured grinding wheel diameter before chamfering operation) / 2 × (horizontal distance between the stop head and the center of the swing shaft / horizontal distance between the center of the grinding head and the center of the swing shaft).

[0017] On the other hand, a control method for a floating chamfering device includes the following steps:

[0018] A. Control the stop head to descend to the working position through the driving mechanism, and open the airbag valve to make the grinding head rise until the swing shaft is stopped by the stop head;

[0019] B. When the round steel enters the rotating pair of wheels, the driving mechanism controls the stop head to retract to the standby position;

[0020] C. The rotating pair of wheels drives the round steel to rotate, and the rotating grinding head grinds and chamfers the corners of the end face of the round steel;

[0021] D. After the predetermined chamfering time, the driving mechanism controls the stop head to descend to the working position again. At the same time, the flat supporting mechanism lifts the round steel away from the grinding head, and the grinding head accelerates to rise under the action of the airbag until the swing shaft is stopped by the stop head;

[0022] E. After chamfering is completed, the drive mechanism controls the stop head to retract to the standby position, and the airbag valve closes to make the grinding head drop to the standby position.

[0023] The drive mode of the drive mechanism can adopt hydraulic drive, motor drive or manual mechanical drive.

[0024] The stroke L of the stop head descending to the working position is L = L0 - L1 - L2, where:

[0025] L0 is the stroke of the stop head descending to the working position when the grinding head installs a new grinding wheel to chamfer the smallest specification round steel. It is actually obtained through tests. After the specification of the round steel to be chamfered changes, or after the diameter of the grinding wheel on the grinding head becomes smaller after chamfering for a period of time, the stroke L of the stop head descending to the working position decreases accordingly;

[0026]

[0027] L2 is the influencing factor of the grinding wheel diameter, L2 = (new grinding wheel diameter - measured grinding wheel diameter before chamfering operation) / 2 × (horizontal distance between the stop head and the center of the swing shaft / horizontal distance between the center of the grinding head and the center of the swing shaft).

[0028] Adopting a floating chamfering device and its control method of the present invention has the following advantages:

[0029] First, after the round steel is lifted, it stops rotating. The grinding head generates an acceleration under the action of the airbag pressure and starts to chase the round steel. The design of the stop mechanism can prevent the grinding head from contacting the round steel before the grinding head chases the round steel, that is, it gives full play to the advantage of uniform chamfering of the floating chamfering machine and avoids the deficiency of chamfering pits.

[0030] Second, the structure of the present invention is simple and highly reliable. It can flexibly control the maximum distance that the grinding head extends to prevent the grinding head from contacting the round steel, and is applicable to chamfering occasions of grinding wheels with different diameters and round steels with different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the chamfering state of the floating chamfering device of the present invention;

[0032] Figure 2 is a schematic structural diagram of the stop state of the floating chamfering device of the present invention;

[0033] Figure 3 is a mechanical stop mechanism of the present invention that uses a motor to drive a rack plate;

[0034] Figure 4 is a mechanical stop mechanism of the present invention that manually adjusts bolts and nuts;

[0035] Figure 5It is a flowchart of the control method of the present invention. Detailed implementation mode

[0036] The following further describes a floating chamfering device and its control method of the present invention. As Figure 1-2 shown, the floating chamfering device mainly includes a rotating pair wheel 9 for driving the rotation of the round steel 7; a grinding head 3 and its airbag floating mechanism 6 arranged on one side of the rotating pair wheel 9. The grinding head 3 (installed with a grinding wheel) is used for chamfering the rotating round steel 7. The airbag floating mechanism 6 drives the swing shaft 10 installed on the foundation column 4 through the airbag 5 to drive the grinding head 3 to float up and down; a flat support mechanism 8 arranged below the rotating pair wheel 9 is used to lift the round steel 7 away from the grinding head 3; a stop mechanism 1 arranged above the swing shaft 10, including a telescopically adjustable stop head 11 and its driving mechanism, is used to limit the upward movement of the grinding head 3.

[0037] The stop mechanism 1 can be specifically designed as follows: on the housing 2 above the grinding head 3, a hydraulic rod type stop mechanism 1 for adjusting the extension length of the stop head 11 is provided, or a mechanical stop mechanism 1 of a motor 12 and a rack plate 13 for adjusting the extension length of the stop head 11 (as Figure 3 shown), and of course, a mechanical stop mechanism 1 for manually adjusting the extension length of the stop head 11 can also be used (such as Figure 4 shown by the bolt and nut 14 type, etc.). The maximum stroke of the extension of the stop head 11 is such that when chamfering the smallest specification round steel 7 with a new grinding wheel of the largest diameter, the stop head can contact the swing shaft 10. In actual work, the stroke of the stop head descending to the actual working position is calculated according to the geometric relationship of the equipment structure, and the calculation formula is as follows:

[0038] The stroke L of the stop head 11 descending to the working position = L0 - L1 - L2

[0039] In the formula:

[0040] L0 - When chamfering the smallest specification round steel 7 with a new grinding wheel installed on the grinding head, the stroke of the stop head descending to the working position, which is actually obtained through tests; after the specification of the round steel to be chamfered changes, or after the diameter of the grinding wheel on the grinding head becomes smaller after chamfering for a period of time, the stroke L of the stop head descending to the working position decreases accordingly;

[0041] L1 - Influence factor of the round steel 7 specification, and the calculation method of L1 is as follows:

[0042]

[0043] L2 - Influence factor of the grinding wheel diameter, L2 = (new grinding wheel diameter - measured grinding wheel diameter before chamfering operation) / 2 × (horizontal distance between the center of the stop head and the center of the swing shaft 10 / horizontal distance between the center of the grinding head 3 and the center of the swing shaft 10).

[0044] AsFigure 5 As shown in the figure, the control method of the floating chamfering device of the present invention is as follows:

[0045] First, control the stop head 11 to descend to the working position through the driving mechanism. Open the air valve of the airbag 5 to make the grinding head 3 rise until the swing shaft 10 is stopped by the stop head 11. Start the rotation of the grinding head 3 to meet the chamfering condition. The round steel 7 enters the chamfering machine loading table, and the loading mechanism pushes the round steel 7 into the alignment roller path. Use the alignment roller path to align one end of the round steel 7, and use the flat support mechanism 8 to translate the round steel 7 onto the first group of rotating pair wheels 9 roller path. At the same time, the driving mechanism controls the stop head 11 to retract to the standby position to prevent the spark splashing generated by subsequent chamfering from damaging the stop head 11. The rotating pair wheels 9 drive the round steel 7 to rotate, and at the same time, the rotating grinding head 3 grinds and chamfers the corner of the end face of the rotating round steel 7. After the predetermined chamfering time, the flat support mechanism 8 starts to rise, and at the same time, the stop head 11 starts to descend to the working position, based on the pre-calculated and stored data in the PLC. When the flat support mechanism 8 continues to rise and lift the round steel 7, the round steel 7 stops rotating, and the rotating grinding head 3 rises with a certain acceleration under the pressure of the airbag 5. When the swing shaft 10 encounters the stop head 11 during the rising process, it stops rising, which can avoid the grinding head 3 chasing the round steel 7 and generating grinding pits. The flat support mechanism 8 translates the round steel 7 onto the next group of alignment roller paths to continue aligning and chamfering the other end, and at the same time, it will translate the next steel onto the first group of pair wheels 9 roller path to start chamfering. At this time, the stop head 11 starts to rise to the standby position again to avoid the grinding sparks of chamfering from splashing. The chamfering process of the other end is the same as that of the first end. The chamfering process of the next round steel 7 is the same as that of the first round steel 7. After the chamfering is completed, when the action of the flat support mechanism 8 ends, the stop head 11 rises to the standby position, the grinding head 3 stops rotating, the air valve of the airbag 5 is closed, and after the airbag 5 deflates, the grinding head 3 drops to the standby position.

[0046] However, those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as it is within the scope of the essential spirit of the present invention, the changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A floating chamfering device, comprising: A rotating pair of wheels for driving the round steel to rotate; A grinding head and its airbag floating mechanism, which is arranged on one side of the rotating pair of wheels. The grinding head is used for chamfering the rotating round steel, and the airbag floating mechanism drives the swing shaft through the airbag to drive the grinding head to float up and down; A flat supporting mechanism, which is arranged below the rotating pair of wheels and is used to lift the round steel away from the grinding head; It is characterized in that it further comprises: A stop mechanism, which is arranged above the swing shaft and includes an extendable and adjustable stop head and its driving mechanism for limiting the upward movement of the grinding head.

2. The floating chamfering device according to claim 1, characterized in that: The driving mechanism is a hydraulic driving type, or an electric motor driving type, or a manual mechanical structure.

3. A floating chamfering device according to claim 1, characterized in that: The stroke L of the stop head descending to the working position = L0 - L1 - L2, where: L0 is the stroke of the stop head descending to the working position when the grinding head installs a new grinding wheel to chamfer the smallest specification round steel, which is obtained through actual tests; after the specification of the round steel to be chamfered changes, or after the diameter of the grinding wheel on the grinding head becomes smaller after chamfering for a period of time, the stroke L of the stop head descending to the working position decreases accordingly; L1 is the influencing factor of the round steel specification, L2 is the influencing factor of the grinding wheel diameter, L2 = (new grinding wheel diameter - measured grinding wheel diameter before chamfering operation) / 2 × (horizontal distance between the stop head and the center of the swing shaft / horizontal distance between the center of the grinding head and the center of the swing shaft).

4. The control method of a floating chamfering device as claimed in claim 1, characterized in that: It includes the following steps: A. Control the stop head to descend to the working position through the driving mechanism, and open the airbag valve to make the grinding head rise until the swing shaft is stopped by the stop head; B. When the round steel enters the rotating pair of wheels, the driving mechanism controls the stop head to retract to the standby position; C. The rotating pair of wheels drives the round steel to rotate, and the rotating grinding head grinds and chamfers the corners of the end face of the round steel; D. After reaching the predetermined chamfering time, the driving mechanism controls the stop head to descend to the working position again, the flat supporting mechanism lifts the round steel away from the grinding head, and at the same time the grinding head accelerates to rise under the action of the airbag until the swing shaft is stopped by the stop head; E. When the chamfering is completed, the driving mechanism controls the stop head to retract to the standby position, and closes the airbag valve to make the grinding head fall to the standby position.

5. The control method of a floating chamfering device according to claim 4, characterized in that: The driving mode of the driving mechanism can adopt hydraulic driving, electric motor driving or manual mechanical driving.

6. The control method of a floating chamfering device according to claim 4, characterized in that: The stroke L of the stop head descending to the working position = L0 - L1 - L2, where: L0 is the stroke of the stop head descending to the working position when the grinding head installs a new grinding wheel to chamfer the smallest specification round steel, which is obtained through actual tests; after the specification of the round steel to be chamfered changes, or after the diameter of the grinding wheel on the grinding head becomes smaller after chamfering for a period of time, the stroke L of the stop head descending to the working position decreases accordingly; L1 is the influencing factor of the round steel specification, L2 is the influencing factor of the grinding wheel diameter, L2 = (new grinding wheel diameter - measured grinding wheel diameter before chamfering operation) / 2 × (horizontal distance between the stop head and the center of the swing shaft / horizontal distance between the center of the grinding head and the center of the swing shaft).

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