CN109454559B - Protective device of thermal mill - Google Patents
Protective device of thermal mill Download PDFInfo
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- CN109454559B CN109454559B CN201811568087.7A CN201811568087A CN109454559B CN 109454559 B CN109454559 B CN 109454559B CN 201811568087 A CN201811568087 A CN 201811568087A CN 109454559 B CN109454559 B CN 109454559B
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- servo motor
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- hydraulic pump
- control rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
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- Fluid-Pressure Circuits (AREA)
- Crushing And Grinding (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The invention belongs to the technical field of wood floor processing equipment, and relates to a protection device of a thermal mill, which comprises a thermal mill body and a driving system, wherein the thermal mill body comprises a thermal mill main shaft 14, a reversing valve 4 and a movable disc 16, the driving system comprises a servo motor 1 and a servo motor control rod 2, a valve core 3 is arranged in the reversing valve 4 and is in contact connection with the servo motor control rod 2 through the valve core 3, and the valve core 3 and the servo motor control rod 2 are always kept in contact in the action process. The beneficial effects achieved by the invention are as follows: through increasing safety device and safety control system, can in time cut off hydraulic system when the unusual condition appears, prevent that the switching-over valve from appearing the malfunction, compare with present prior art, improve the security stability of equipment operation, reduce the probability of occurrence of equipment accident.
Description
Technical Field
The invention belongs to the technical field of wood floor processing equipment, and particularly relates to a protection device of a thermal mill.
Background
The polisher (thermal polisher) is a common machine in industrial equipment, is widely used for finish machining and surface polishing treatment in the die industry, and is a substitute for similar pneumatic products. The wood floor board is often required to polish the surface in the production and processing process, the surface of the board is required to be polished, the welding part of the board is required to be polished to be thinned, and the early common polishing machine is required to be manually reciprocated to and fro for polishing, so that the wood floor board is time-consuming and labor-consuming, and is easy to cause injury of operators due to accidents.
With the progress of technology, a thermal mill used in the artificial board industry generally adopts two types of mechanical or hydraulic control on the clearance of a grinding disc. The basic principle of the mechanical control system is that the worm and gear mechanism is regulated by a manual or servo motor to move the millstone slightly, but most of the equipment at present adopts a hydraulic control system because the worm and gear mechanism is easy to wear and has low control precision. The hydraulic control system adopts a reversing valve to change the direction of oil, so that the movable disc of the thermal mill is pushed to advance or retreat, and precise control of the clearance of the grinding disc is realized.
There are two different ways to actuate the reversing valve in a hydraulic control system: compared with pilot hydraulic valve control, the pilot hydraulic valve control and the servo motor control have the advantages that the requirements on cleanliness of oil liquid by the servo motor control are reduced, and the operation is stable. However, the servo motor control system also has the following problems: because the servo motor and the movable disc are connected together to synchronously advance and retreat, and are connected with the reversing valve in a contact mode (connected by the motor control rod and connected with the non-motor body), when the valve core of the reversing valve is blocked due to reasons, the movable disc cannot move forwards and backwards, namely, the clearance between the movable disc and the static disc is unchanged, in the actual operation process, a control person can continuously activate the servo motor when finding that the clearance between the movable disc is unchanged, so that the control rod of the servo motor can be separated from the valve core, the valve core is in a completely opened or closed state, once the follow-up valve core is recovered to be normal, oil can always and rapidly flow into one direction, and the grinding disc can rapidly close the guide and actuating disc and the static disc to generate a collision disc.
Referring to fig. 1, the specific principle is as follows: the position of the valve core 3 determines the flow direction of the oil, and thus whether the grinding disc is opened or closed, as follows: the valve core 3 is positioned on the right side, the right side reset spring 19 is in a compressed state, oil enters the left side of the clearance control oil cylinder through the left output oil pipe 7, the main shaft 14 of the thermofiner and the movable disc 16 move to the right side together, and the clearance between the movable disc 16 and the static disc 17 is reduced (the millstone is closed); when the valve core 3 is at the left side and the right return spring 19 is in a relaxed state, oil enters the right side of the clearance control oil cylinder 13 through the right output oil pipe 8, the main shaft 14 of the thermal mill and the movable disc 16 move to the left side of the drawing together, and then the clearance between the movable disc 16 and the static disc 17 is enlarged (the grinding disc is opened).
Under the current working state: the servo motor 1 is fixed on the main shaft 14 of the thermal mill, the control rod 2 of the servo motor is in contact with the valve core 3 of the reversing valve 4, when the grinding disc needs to be closed, namely the movable disc 16 needs to move to the right side, an operation command is transmitted to the servo motor 1 to act, the control rod 2 of the servo motor is commanded to stretch out, the valve core 3 of the reversing valve 4 is pushed to move to the right side, oil flows into the gap control oil cylinder 13 of the thermal mill through the left output oil pipe 7 to act in the correct direction, the movable disc 16 is pushed to perform closing action, namely move to the right side, and the reset spring 19 on the right side of the valve core 3 ensures that the control rod 2 of the servo motor and the valve core 3 of the reversing valve 4 are always kept in contact. During the closing, i.e. rightward movement, of the movable disk 16, the servomotor 1 moves forward together with the thermofiner spindle 14, so that the servomotor lever 2 must be retracted by a corresponding displacement to ensure that it remains in the same position as the spool 3 of the reversing valve 4.
When abnormal conditions such as jamming and the like occur in the valve core 3 of the reversing valve 4: when the grinding disc needs to be closed, namely the movable disc 16 needs to move to the right, the position of the valve core 3 is on the right, and the main shaft 14 of the thermofiner, the movable disc 16 and the servo motor 1 are also moved to the right. The operating command then gives a command to keep the position of the spool 3 unchanged (oil needs to enter the right output oil pipe 8 from the clearance control cylinder), the signal from the servo motor 1 to the control rod 2 needs to move to the left, and the servo motor control rod 2 will move to the left. However, the valve core 3 is blocked, so that the actual gap is unchanged, that is, the positions of the movable disc 16 and the static disc 17 are not changed, and the positions of the main shaft 14 of the thermogrinder and the servo motor 1 are not changed, so that the control rod 2 of the servo motor is separated from the valve core 3 of the reversing valve 4.
When the valve core 3 of the reversing valve 4 is automatically reset after normal, at the moment, the servo motor control rod 2 does not prop against the valve core 3 of the reversing valve 4, the valve core 3 is in a full-open state under the action of a reset spring, and oil enters the gap control oil cylinder 13 through the left output oil pipe 7, so that the movable disc 16 is rapidly close to the static disc 17, and a 'collision disc' is caused.
The invention aims to provide a protection device of a thermal mill, which is based on improvement of the existing thermal mill, has simple transformation process, low cost and high production efficiency, prevents a stop disc from being in collision with a static disc due to unidirectional oil inlet of a reversing valve, and effectively avoids safety accidents of thermal mill equipment.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the protection device for the thermal mill is formed by developing and improving the existing thermal mill, has the advantages of simple transformation process, low cost and high production efficiency, prevents the stop disc from being in collision with the static disc due to unidirectional oil inlet of the reversing valve, and effectively avoids safety accidents of thermal mill equipment.
The invention is realized by the following technical scheme: the protection device of the thermal mill comprises a thermal mill body and a driving system, wherein the thermal mill body comprises a thermal mill main shaft, a reversing valve and a movable disc, the driving system comprises a servo motor and a servo motor control rod, the servo motor is fixed on one end of the thermal mill main shaft, the movable disc is fixed on the other end of the thermal mill main shaft, a valve core is arranged in the reversing valve and is in contact connection with the servo motor control rod through the valve core, the valve core and the servo motor control rod are always kept in contact in the action process,
the safety device is composed of a connecting mechanism and a safety contact, the connecting mechanism ensures the contact with the safety contact in a normal state through an adjusting bolt, the safety contact is connected on a reversing valve through a bolt, the connecting mechanism is fixedly connected with a control rod of a servo motor,
the safety control system comprises a hydraulic pump and a control system, wherein the control system is in communication connection with a safety contact of the safety device and controls the working and starting and stopping of the hydraulic pump.
Further, the control loop of the control system consists of a 24V safety power supply, a safety contact, a 24V repeater, a hydraulic pump control power supply and a hydraulic pump contactor.
Further, the control principle of the control system is as follows: when the control rod of the servo motor props against the valve core of the reversing valve, the safety contact is closed, the 24V relay is electrified, the hydraulic pump contactor is electrified, and therefore the hydraulic pump control power supply is connected, and the hydraulic pump is started; when the control rod of the servo motor leaves the valve core of the reversing valve, the connecting mechanism is separated from the safety contact simultaneously, the safety contact is disconnected, the 24V relay cannot be electrified, the hydraulic pump contactor is not attracted, the hydraulic pump control power supply is disconnected, and the hydraulic pump stops working.
Furthermore, the connecting mechanism is of an integral structure, one end of the connecting mechanism is contacted with the safety contact through the adjusting bolt, and the other end of the connecting mechanism is fixedly connected with the control rod of the servo motor.
Furthermore, the connecting mechanism is of an L-shaped integral structure, the long side of the L-shaped connecting mechanism is connected with a servo motor control rod, and the short side of the L-shaped connecting mechanism is connected with a safety contact.
Furthermore, the L-shaped integral connecting mechanism is fixedly connected with the control rod of the servo motor by adopting a hoop.
When the control rod of the servo motor leaves the valve core of the reversing valve, the connecting mechanism is separated from the safety contact, so that a feedback signal of the safety contact is activated, and the signal is transmitted to the liquid safety control system through a feedback loop of the signal of the safety contact, so that the hydraulic pump stops working. After the fault is removed, the servo motor control rod is manually set to be contacted with the valve core of the reversing valve again, the connecting mechanism is simultaneously contacted with the safety contact again, the safety device is reset, and the hydraulic pump is started again to resume normal operation.
The valve core of the reversing valve is connected with the clearance control oil cylinder through a hydraulic oil pipe to control the main shaft of the thermal mill to move left and right, and the main shaft support bearing is used for supporting the main shaft of the thermal mill and the movable disc.
The beneficial effects achieved by the invention are as follows: through increasing safety device and safety control system, can in time cut off hydraulic system when the unusual condition appears, prevent that the switching-over valve from appearing the malfunction, compare with present prior art, improve the security stability of equipment operation, reduce the probability of occurrence of equipment accident.
Drawings
Fig. 1 is a schematic diagram of the main working components of a prior art thermal mill.
Fig. 2 is a schematic view of a closed state of a millstone of a protection device of a thermal mill according to the present invention.
Fig. 3 is a schematic view of the opened state of the millstone of the protection device of the thermal mill.
Fig. 4 is a schematic view of the composition of the safety device (18) according to the present invention.
Fig. 5 is a schematic diagram 1 of a control loop of a control system according to the present invention.
Fig. 6 is a schematic diagram of a control loop of the control system according to the present invention.
Wherein, each part name is: 1. the hydraulic pump comprises a servo motor, 2, a servo motor control rod, 3, a valve core, 4, a reversing valve, 5, a connecting mechanism, 6, an input oil pipe, 7, a left output oil pipe, 8, a right output oil pipe, 9, a hydraulic pump, 10, a safety control system, 11, a safety contact signal feedback loop, 12, a safety contact, 13, a clearance control oil cylinder, 14, a main shaft of a thermal mill, 15, a main shaft supporting bearing, 16, a movable disc, 17, a static disc, 18, a safety device, 19, a return spring, 31, 24V safety power supply, 32, 24V relay, 34, a hydraulic pump control power supply, 35 and a hydraulic pump contactor.
Detailed Description
The present invention will be described in detail with reference to the following examples, so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following examples.
Example 1
The protection device of the thermal mill comprises a thermal mill body and a driving system, wherein the thermal mill body comprises a thermal mill main shaft 14, a reversing valve 4 and a movable disc 16, the driving system comprises a servo motor 1 and a servo motor control rod 2, the servo motor 1 is fixed on one end of the thermal mill main shaft 14, the movable disc 16 is fixed on the other end of the thermal mill main shaft 14, a valve core 3 is arranged in the reversing valve 4 and is in contact connection with the servo motor control rod 2 through the valve core 3, the valve core 3 and the servo motor control rod 2 are always kept in contact in the action process,
the safety device 18 and the safety control system 10 are also provided, the safety device 18 is composed of a connecting mechanism 5 and a safety contact 12, the connecting mechanism 5 ensures contact with the safety contact 12 in a normal state through an adjusting bolt, the safety contact 12 is connected on the reversing valve 4 through a bolt, the connecting mechanism 5 is fixedly connected with the servo motor control rod 2,
the safety control system 10 comprises a hydraulic pump 9 and a control system, wherein the control system is in communication connection with a safety contact (12) of a safety device 18 and controls the operation and start-stop of the hydraulic pump 9.
The valve core 3 of the reversing valve 4 is connected with the clearance control oil cylinder 13 through the hydraulic oil pipe 9 to control the main shaft 14 of the thermal mill to move left and right, and the main shaft support bearing (15) is used for supporting the main shaft 14 of the thermal mill and the movable disc 16.
The control loop of the control system consists of a 24V safety power supply 31, a safety contact 12, a 24V relay 33, a hydraulic pump control power supply 34 and a hydraulic pump contactor 35.
When the servo motor control rod 2 leaves the valve core 3 of the reversing valve 4, the connecting mechanism 5 is separated from the safety contact 1), so that a feedback signal of the safety contact 12 is activated, and the signal is transmitted to the hydraulic safety control system 10 through the feedback loop 11 of the safety contact signal, so that the hydraulic pump 9 stops working.
After the fault is cleared, the servo motor control rod 2 is manually set to be contacted with the valve core 3 of the reversing valve 4 again, the connecting mechanism 5 is simultaneously contacted with the safety contact 12, the safety device 18 is reset, and the hydraulic pump 9 is started again to resume normal operation.
Example 2
The protection device of the thermal mill comprises a thermal mill body and a driving system, wherein the thermal mill body comprises a thermal mill main shaft 14, a reversing valve 4 and a movable disc 16, the driving system comprises a servo motor 1 and a servo motor control rod 2, the servo motor 1 is fixed on one end of the thermal mill main shaft 14, the movable disc 16 is fixed on the other end of the thermal mill main shaft 14, a valve core 3 is arranged in the reversing valve 4 and is in contact connection with the servo motor control rod 2 through the valve core 3, the valve core 3 and the servo motor control rod 2 are always kept in contact in the action process,
the safety device 18 and the safety control system 10 are also provided, the safety device 18 is composed of a connecting mechanism 5 and a safety contact 12, the connecting mechanism 5 ensures contact with the safety contact 12 in a normal state through an adjusting bolt, the safety contact 12 is connected on the reversing valve 4 through a bolt, the connecting mechanism 5 is fixedly connected with the servo motor control rod 2,
the safety control system 10 comprises a hydraulic pump 9 and a control system, wherein the control system is in communication connection with a safety contact (12) of a safety device 18 and controls the operation and start-stop of the hydraulic pump 9.
The connecting mechanism 5 is of an L-shaped integral structure, the long side of the L-shaped connecting servo motor control rod 2, and the short side of the L-shaped connecting safety contact 12.
The valve core 3 of the reversing valve 4 is connected with the clearance control oil cylinder 13 through the hydraulic oil pipe 9 to control the main shaft 14 of the thermal mill to move left and right, and the main shaft support bearing (15) is used for supporting the main shaft 14 of the thermal mill and the movable disc 16.
The control loop of the control system consists of a 24V safety power supply 31, a safety contact 12, a 24V relay 33, a hydraulic pump control power supply 34 and a hydraulic pump contactor 35.
When the servo motor control rod 2 leaves the valve core 3 of the reversing valve 4, the connecting mechanism 5 is separated from the safety contact 1), so that a feedback signal of the safety contact 12 is activated, and the signal is transmitted to the hydraulic safety control system 10 through the feedback loop 11 of the safety contact signal, so that the hydraulic pump 9 stops working.
After the fault is cleared, the servo motor control rod 2 is manually set to be contacted with the valve core 3 of the reversing valve 4 again, the connecting mechanism 5 is simultaneously contacted with the safety contact 12, the safety device 18 is reset, and the hydraulic pump 9 is started again to resume normal operation.
Example 3
The protection device of the thermal mill comprises a thermal mill body and a driving system, wherein the thermal mill body comprises a thermal mill main shaft 14, a reversing valve 4 and a movable disc 16, the driving system comprises a servo motor 1 and a servo motor control rod 2, the servo motor 1 is fixed on one end of the thermal mill main shaft 14, the movable disc 16 is fixed on the other end of the thermal mill main shaft 14, a valve core 3 is arranged in the reversing valve 4 and is in contact connection with the servo motor control rod 2 through the valve core 3, the valve core 3 and the servo motor control rod 2 are always kept in contact in the action process,
the safety device 18 and the safety control system 10 are also provided, the safety device 18 is composed of a connecting mechanism 5 and a safety contact 12, the connecting mechanism 5 ensures contact with the safety contact 12 in a normal state through an adjusting bolt, the safety contact 12 is connected on the reversing valve 4 through a bolt, the connecting mechanism 5 is fixedly connected with the servo motor control rod 2,
the safety control system 10 comprises a hydraulic pump 9 and a control system, wherein the control system is in communication connection with a safety contact (12) of a safety device 18 and controls the operation and start-stop of the hydraulic pump 9.
The connecting mechanism 5 is of an L-shaped integral structure, the long side of the L-shaped connecting servo motor control rod 2, and the short side of the L-shaped connecting safety contact 12. The long side of L is connected with the control rod 2 of the servo motor by adopting a hoop.
The valve core 3 of the reversing valve 4 is connected with the clearance control oil cylinder 13 through the hydraulic oil pipe 9 to control the main shaft 14 of the thermal mill to move left and right, and the main shaft support bearing (15) is used for supporting the main shaft 14 of the thermal mill and the movable disc 16.
The control loop of the control system consists of a 24V safety power supply 31, a safety contact 12, a 24V relay 33, a hydraulic pump control power supply 34 and a hydraulic pump contactor 35.
When the servo motor control rod 2 leaves the valve core 3 of the reversing valve 4, the connecting mechanism 5 is separated from the safety contact 1), so that a feedback signal of the safety contact 12 is activated, and the signal is transmitted to the hydraulic safety control system 10 through the feedback loop 11 of the safety contact signal, so that the hydraulic pump 9 stops working.
After the fault is cleared, the servo motor control rod 2 is manually set to be contacted with the valve core 3 of the reversing valve 4 again, the connecting mechanism 5 is simultaneously contacted with the safety contact 12, the safety device 18 is reset, and the hydraulic pump 9 is started again to resume normal operation.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather to utilize the equivalent structures or equivalent processes disclosed in the present specification, or to directly or indirectly apply to other related technical fields, which are all included in the scope of the present invention.
Claims (4)
1. The utility model provides a thermal mill protection device, includes thermal mill body, actuating system, thermal mill body includes thermal mill main shaft (14), switching-over valve (4), movable disk (16), actuating system includes servo motor (1) and servo motor control rod (2), servo motor (1) are fixed on thermal mill main shaft (14) one end, movable disk (16) are fixed on thermal mill main shaft (14) other end, be equipped with case (3) in switching-over valve (4) to through case (3) and servo motor control rod (2) contact connection, case (3) and servo motor control rod (2) remain contact throughout in the action process,
the method is characterized in that: the safety device is also provided with a safety device (18) and a safety control system (10), the safety device (18) consists of a connecting mechanism (5) and a safety contact (12), the connecting mechanism (5) is ensured to be contacted with the safety contact (12) in a normal state through an adjusting bolt, the safety contact (12) is connected on a reversing valve (4) through a bolt, the connecting mechanism (5) is fixedly connected with a servo motor control rod (2),
the safety control system (10) comprises a hydraulic pump (9) and a control system, the control system is in communication connection with a safety contact (12) of a safety device (18) and controls the work and start and stop of the hydraulic pump (9),
the control loop of the control system consists of a 24V safety power supply (31), a safety contact (12), a 24V relay (33), a hydraulic pump control power supply (34) and a hydraulic pump contactor (35),
the connecting mechanism (5) is of an integral structure, one end of the connecting mechanism is contacted with the safety contact (12) through an adjusting bolt, and the other end of the connecting mechanism is fixedly connected with the servo motor control rod (2).
2. The thermal mill protection device of claim 1, wherein: the control principle of the control system is as follows: when the servo motor control rod (2) props against the valve core (3) of the reversing valve (4), the safety contact (12) is closed, the 24V relay (33) is powered on, the hydraulic pump contactor (35) is powered on, and therefore the hydraulic pump control power supply (34) is connected, and the hydraulic pump is started; when the servo motor control rod leaves the valve core of the reversing valve, the connecting mechanism (5) is separated from the safety contact (12) simultaneously, the safety contact (12) is disconnected, the 24V repeater (33) is not powered, the hydraulic pump contactor (35) is not attracted, the hydraulic pump control power supply (34) is disconnected, and the hydraulic pump stops working.
3. The thermal mill protection device of claim 1, wherein: the connecting mechanism (5) is of an L-shaped integral structure, the long side of the L-shaped is connected with the servo motor control rod (2), and the short side of the L-shaped is connected with the safety contact (12).
4. A thermofiner guard according to claim 3, characterized in that: the L-shaped long side of the L-shaped integral connecting mechanism (5) is fixedly connected with the servo motor control rod (2) by adopting a hoop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811568087.7A CN109454559B (en) | 2018-12-21 | 2018-12-21 | Protective device of thermal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811568087.7A CN109454559B (en) | 2018-12-21 | 2018-12-21 | Protective device of thermal mill |
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| Publication Number | Publication Date |
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| CN109454559A CN109454559A (en) | 2019-03-12 |
| CN109454559B true CN109454559B (en) | 2023-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811568087.7A Active CN109454559B (en) | 2018-12-21 | 2018-12-21 | Protective device of thermal mill |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2294135Y (en) * | 1997-05-16 | 1998-10-14 | 天津液压机械(集团)有限公司 | Safety device for grinding machine |
| CN203031401U (en) * | 2012-12-25 | 2013-07-03 | 武汉宝德机电有限责任公司 | Double-wheel numerical-control roll grinder |
| CN103266515A (en) * | 2013-05-23 | 2013-08-28 | 镇江市欧菱电气自动化系统设备有限公司 | Water cooling system for mechanical sealing of main shaft of defibrator |
| CN105598847A (en) * | 2014-06-19 | 2016-05-25 | 衢州市优德工业设计有限公司 | Stone carving grinding system with dust absorption prior to dust removal |
| CN208019976U (en) * | 2018-03-29 | 2018-10-30 | 东莞市春草研磨科技有限公司 | A kind of profiling flat-grinding machine |
-
2018
- 2018-12-21 CN CN201811568087.7A patent/CN109454559B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2294135Y (en) * | 1997-05-16 | 1998-10-14 | 天津液压机械(集团)有限公司 | Safety device for grinding machine |
| CN203031401U (en) * | 2012-12-25 | 2013-07-03 | 武汉宝德机电有限责任公司 | Double-wheel numerical-control roll grinder |
| CN103266515A (en) * | 2013-05-23 | 2013-08-28 | 镇江市欧菱电气自动化系统设备有限公司 | Water cooling system for mechanical sealing of main shaft of defibrator |
| CN105598847A (en) * | 2014-06-19 | 2016-05-25 | 衢州市优德工业设计有限公司 | Stone carving grinding system with dust absorption prior to dust removal |
| CN208019976U (en) * | 2018-03-29 | 2018-10-30 | 东莞市春草研磨科技有限公司 | A kind of profiling flat-grinding machine |
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