CN112571248A - Diamond fretsaw grinding device - Google Patents

Diamond fretsaw grinding device Download PDF

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Publication number
CN112571248A
CN112571248A CN202011568596.7A CN202011568596A CN112571248A CN 112571248 A CN112571248 A CN 112571248A CN 202011568596 A CN202011568596 A CN 202011568596A CN 112571248 A CN112571248 A CN 112571248A
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CN
China
Prior art keywords
winding wheel
winding
motor
wire saw
component
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Pending
Application number
CN202011568596.7A
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Chinese (zh)
Inventor
王俊普
巴振永
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Tianjin Xinkai Manufacturing Technology Co ltd
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Tianjin Xinkai Manufacturing Technology Co ltd
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Publication date
Application filed by Tianjin Xinkai Manufacturing Technology Co ltd filed Critical Tianjin Xinkai Manufacturing Technology Co ltd
Priority to CN202011568596.7A priority Critical patent/CN112571248A/en
Publication of CN112571248A publication Critical patent/CN112571248A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/033Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/0092Grinding attachments for lathes or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00Safety 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00Safety 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
    • B24B55/12Devices for exhausting mist of oil or coolant; Devices for collecting or recovering materials resulting from grinding or polishing, e.g. of precious metals, precious stones, diamonds or the like

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The invention provides a diamond wire saw grinding device which comprises a base, and a discharging component, a receiving component, a first winding device, a second winding device, an auxiliary component, a grinding component, a tensioning component and a waste material cylinder which are respectively arranged on the base. The diamond wire saw grinding device provided by the invention is provided with the two winding devices to prevent the wire saw from deviating, is provided with the waste cylinder for collecting the grinding stone powder to prevent the pollution to the production environment, and has the advantages of simple structure, simple operation, simple replication, low cost and high production efficiency.

Description

Diamond fretsaw grinding device
Technical Field
The invention belongs to the field of wire saw manufacturing, and particularly relates to a diamond wire saw grinding device.
Background
The diamond wire saw is also called as a diamond wire, and is characterized in that a diamond abrasive is fixed on a metal wire by using an electroplating process or a resin bonding method, and the diamond wire saw cutting technology is different from the traditional mortar cutting technology and adopts a multi-wire cutting technology. The technology has strong cutting capability and high efficiency; the wire diameter size of the diamond wire saw is strictly controlled, the cutting loss of a cutting material is small, and the precision of a cut product is high; because mortar is not used, the working environment is clean, the steel wire is an energy-saving and environment-friendly product, and after the diamonds are electroplated on the steel wire, the diamonds which are not firmly or uniformly adhered need to be polished in a polishing mode so as to ensure the quality of the product.
Disclosure of Invention
In view of this, the invention aims to provide a diamond wire saw grinding device to solve the problems that a wire saw deviates in the production process, is deformed and clamped off by a grinding stone clamp and needs to be stopped frequently for finishing.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a diamond wire saw grinding device, including the blowing subassembly of installing respectively on the base and, receive the material subassembly, first winding device, second winding device, the auxiliary assembly, the subassembly of polishing, tensioning subassembly and waste material section of thick bamboo, the both sides of auxiliary assembly set up first winding device and second winding device respectively, and coping saw one end fixed connection to the periphery of blowing subassembly, the other end of coping saw extends to first winding device after blowing subassembly periphery winding in proper order, the auxiliary assembly, second winding device and the periphery of receiving the material subassembly, the auxiliary assembly top sets up the subassembly of polishing, the auxiliary assembly below sets up the tensioning subassembly, and the blowing section of thick bamboo is located the tensioning subassembly below, the blowing subassembly, receive the material subassembly, the auxiliary assembly, the equal signal connection of the subassembly of polishing and tensioning subassembly is to the controller, the inside intercommunication of waste material section of thick bamboo is to external exhaust duct.
Furthermore, receive the material subassembly and the blowing subassembly structure is the same, and the blowing subassembly includes first motor and reel, on the peripheral fixed connection of first motor to the base, the transmission shaft fixed connection of first motor to the one end of reel, the one end fixed connection of coping saw to the periphery of reel, first motor signal connection to controller.
Furthermore, first winding device is the same with the second winding device structure, and first winding device is including a plurality of first winding wheels and a plurality of second winding wheels of mutual parallel arrangement, first winding wheel is located second winding wheel top, just first winding wheel with second winding wheel staggered distribution.
Further, first winding wheel with the structure of second winding wheel is the same, first winding wheel includes first axis and first gyro wheel, and first axis one end is cup jointed to the base, and first gyro wheel is cup jointed to first centraxonial periphery, and first gyro wheel periphery is equipped with and is used for the peripheral first annular of joint coping saw.
Further, the auxiliary assembly includes second motor, third winding wheel, fourth winding wheel, fifth winding wheel, sixth winding wheel and a plurality of winding, a plurality of winding sets of being parallel to each other, third winding wheel, fourth winding wheel, fifth winding wheel and sixth winding wheel all are parallel to each other and all are located the winding inner circle, third winding wheel is located sixth winding wheel top, third winding wheel and fourth winding wheel are with the level, fifth winding wheel and sixth winding wheel are with the level, third winding wheel one end sets up the second motor, second motor signal connection is to the controller.
Further, the structure homogeneous phase of third winding wheel, fourth winding wheel, fifth winding wheel, sixth winding wheel and a plurality of ring line, third winding wheel includes second axis and second gyro wheel, and the centraxonial one end of second is installed the second motor, and the centraxonial periphery of second cup joints the second gyro wheel, and second gyro wheel periphery is equipped with second annular and a plurality of third annular, and second annular and every third annular are parallel arrangement each other, the second annular is located second gyro wheel middle part and is used for the joint coping saw periphery, and a plurality of third annular distribute in the both sides of second annular, and every third annular all is used for the periphery of joint ring line, third annular and ring line one-to-one.
Furthermore, the material of the loop wire is a carborundum wire saw.
Further, the polishing assembly is the same as the tensioning assembly in structure, the polishing assembly comprises a third motor, a support plate, a fastening bolt and a grinding stone, the periphery of the third motor is fixedly connected to the base, the lower end of the third motor is provided with the grinding stone through the support plate, the grinding stone is located above the auxiliary assembly, the cross section of the third support plate is of a U-shaped structure, the fastening bolt used for pressing the grinding stone is installed on one side of the third support plate, and the third motor is connected to the controller in a signal mode.
Compared with the prior art, the diamond wire saw grinding device has the following advantages:
(1) the diamond wire saw grinding device provided by the invention is provided with the two winding devices to prevent the wire saw from deviating, is provided with the waste cylinder for collecting the grinding stone powder to prevent the pollution to the production environment, and has the advantages of simple structure, simple operation, simple replication, low cost and high production efficiency.
(2) The diamond wire saw grinding device is provided with the auxiliary assembly, so that the phenomenon that a wire saw clamp is deformed and clamped off due to the fact that a grinding stone is ground into a groove by a single wire saw grinding is prevented, the product quality is ensured, the wire saw breaking machine halt is avoided, and the production efficiency is increased.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a diamond wire saw grinding device according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a discharging assembly according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a first winding wheel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an auxiliary assembly according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a grinding assembly according to an embodiment of the present invention.
Description of reference numerals:
1-a base; 2-a discharging component; 21-a first motor; 22-a reel; 3-a material receiving assembly; 4-a first winding device; 41-a first medial axis; 42-a first roller; 43-a first ring groove; 5-a second winding device; 6-an auxiliary component; 61-a second motor; 62-a third winding wheel; 621-a second medial axis; 622-second roller; 623-a second ring groove; 624-third ring groove; 63-a fourth winding wheel; 64-a fifth winding wheel; 65-a sixth winding wheel; 66-loop line; 7-grinding the component; 71-a third motor; 72-a support plate; 73-fastening bolts; 74-a grindstone; 8-a tensioning assembly; 9-waste cylinder.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in figures 1-5, the diamond wire saw grinding device comprises a base 1 and a feeding assembly 2, a receiving assembly 3, a first winding device 4, a second winding device 5, an auxiliary assembly 6, a grinding assembly 7, a tensioning assembly 8 and a waste barrel 9 which are respectively arranged on the base, wherein the first winding device 4 and the second winding device 5 are respectively arranged on two sides of the auxiliary assembly 6, the first winding device 4 and the second winding device 5 are used for releasing the tension of a wire saw 10 and putting the relative position of the wire saw 10 through running materials, so that the wire saw 10 runs on a fixed track of the first winding device 4 and the second winding device 5 to prevent the wire saw 10 from running off, one end of the wire saw 10 is fixedly connected to the periphery of the feeding assembly 2, the other end of the wire saw 10 is wound along the periphery of the feeding assembly 2 and then sequentially extends to the peripheries of the first winding device 4, the auxiliary assembly 6, the second winding device 5 and the receiving assembly 2, when the equipment runs, the feeding component 2 and the receiving component 3 rotate in opposite directions respectively, the tension of the receiving component 3 is greater than that of the feeding component 2, the straight running state of the wire saw 10 is ensured in turn, the polishing component 7 is arranged above the auxiliary component 6, for polishing the wire saw 10, a tensioning assembly 8 is arranged below the auxiliary assembly 6 and used for adjusting the tension of the auxiliary assembly 6, a discharging barrel 9 is arranged below the tensioning assembly 9, the discharging barrel 9 is used for collecting powder of the grinding stones 74 to prevent the powder from polluting the working environment, and the inside intercommunication of garbage bin 9 is to external exhaust duct, and blowing subassembly 2, receipts material subassembly 3, auxiliary assembly 6, polishing subassembly 7 and tensioning assembly 8 are all signal connection to controller, including touch-sensitive screen and signal connection 'S PLC in the controller, and revolving stage mechanism and welding mechanism are all signal connection to PLC, and PLC' S model is Siemens S7-200smart, can pass through the touch-sensitive screen as required and input control command in to PLC.
The material receiving assembly 3 and the material discharging assembly 2 are identical in structure, the material discharging assembly 2 comprises a first motor 21 and a winding drum 22, the periphery of the first motor 21 is fixedly connected to the base 1, a transmission shaft of the first motor 21 is fixedly connected to one end of the winding drum 22, one end of the wire saw 10 is fixedly connected to the periphery of the winding drum 22, the model of the first motor 21 is 60M-01330F5-E, and the first motor 21 is in signal connection with a controller.
First winding device 4 is the same with 5 structures of second winding device, and first winding device 4 includes a plurality of first winding wheels and a plurality of second winding wheel of mutual parallel arrangement, first winding wheel is located second winding wheel top, just first winding wheel with second winding wheel staggered distribution, first winding wheel with the structure of second winding wheel is the same, first winding wheel includes first axis 41 and first gyro wheel 42, and first axis 41 one end is cup jointed to base 1 on, and first gyro wheel 42 is cup jointed to first axis 41's periphery, and first gyro wheel 42 periphery is equipped with and is used for the peripheral first annular 43 of joint coping saw 10, it is the arc structure to enclose in the first annular 43, avoids coping saw 10 and cuts the quality that destroys coping saw 10 with the hard right angle of coping saw, and reduces the life of first gyro wheel 42.
The auxiliary assembly 6 comprises a second motor 61, a third winding wheel 62, a fourth winding wheel 63, a fifth winding wheel 64, a sixth winding wheel 65 and a plurality of circular wires 66, wherein the plurality of circular wires 66 are arranged in parallel, the third winding wheel 62, the fourth winding wheel 63, the fifth winding wheel 64 and the sixth winding wheel 65 are arranged in parallel and are all positioned at the inner circle of the circular wires 66, the third winding wheel 62 is positioned above the sixth winding wheel 65, the third winding wheel 62 is positioned at the same level with the fourth winding wheel 63, the fifth winding wheel 64 is positioned at the same level with the sixth winding wheel 65, one end of the third winding wheel 62 is provided with the second motor 61, the second motor 61 is the same as the first motor 21 in model, the second motor 61 is in signal connection with the controller, the third winding wheel 62, the fourth winding wheel 63, the fifth winding wheel 64, the sixth winding wheel 65 and the plurality of circular wires 66 are all configured in the same manner, the third winding wheel 62 comprises a second roller 621 and a second roller 621, a second motor 61 is installed at one end of a second center shaft 621, a second roller 622 is sleeved on the periphery of the second center shaft 621, a second ring groove 623 and a plurality of third ring grooves 624 are arranged on the periphery of the second roller 622, the second ring groove 623 and each third ring groove 624 are arranged in parallel, the second ring groove 623 is located in the middle of the second roller 622 and used for clamping the periphery of the wire saw 10, the plurality of third ring grooves 624 are distributed on two sides of the second ring groove 623, each third ring groove 624 is used for clamping the periphery of the loop wire 66, the third ring grooves 624 correspond to the loop wires 66 one by one, the loop wires 66 are made of carborundum wire saws, the lower ends of the abrasive wires 74 can be easily ground into grooves by the single wire saw 10 during the material running of the abrasive wires 74, the peripheries of the wire saws 10 are clamped on two sides of the grooves along with continuous deepening of the grooves, the wire saws 10 are easily deformed or even broken, and the wire saws 66 arranged on the auxiliary assembly 6 are, the end faces of the grinding stones 74 are synchronously ground, so that the phenomenon that the wire saw 10 is deformed and clamped off by the grooves is avoided, the product quality is ensured, the wire cutting machine is avoided, and the production efficiency is increased.
The grinding assembly 7 and the tensioning assembly 8 are identical in structure, the grinding assembly 7 comprises a third motor 71, a support plate 72, a fastening bolt 73 and a grinding stone 74, the periphery of the third motor 71 is fixedly connected to the base 1, the grinding stone 74 is mounted at the lower end of the third motor 71 through the support plate 72, the grinding stone 74 is located above the auxiliary assembly 6, the cross section of the third support plate 72 is of a U-shaped structure, the fastening bolt 73 used for pressing the grinding stone 74 is mounted on one side of the third support plate 72, the third motor 71 is a push rod motor, the model of the third motor 71 is YMD-606, the third motor 71 is in signal connection with a controller, the two third motors 71 respectively provide downward pressure of the grinding stone 74 for the grinding assembly 7 and upward pressure for the tensioning assembly 8 grinding stone 74, grinding operation of the wire saw 10 is ensured, and the fastening state of the loop wire 66 is ensured.
The working process of the diamond wire saw grinding device comprises the following steps:
a worker fixedly connects a first end of a wire saw 10 to the periphery of a discharging assembly 2, a second end of the wire saw 10 is sequentially extended to the peripheries of a first winding device 4, an auxiliary assembly 6, a second winding device 5 and a receiving assembly 2 after being wound along the periphery of the discharging assembly 2, the second end of the wire saw 10 is fixedly connected to the periphery of the receiving assembly 2, then the worker inputs two opposite rotation instructions to a PLC through a touch screen, meanwhile, the tension of a first motor 31 of the receiving assembly 3 is set to be a large value, the rotation direction of a second motor 61 is the same as the rotation direction of the first motor 31 of the receiving assembly 3, the slow rotation driven state is set, the worker sends a downward movement instruction of a third motor 71 of a polishing assembly 7 to the PLC through a point touch screen, the PLC controls the third motor 71 to rotate, a push rod of the third motor 71 pushes a grinding stone 74 to move downwards through a support plate 72 until the lower end of the grinding stone 74 abuts against the periphery of the wire saw, stopping the point touch screen, stopping the movement of the third motor 71, and in the same way, pushing the upper end of the grinding stone 74 of the tensioning assembly 8 to the periphery of the plurality of loop wires 66, visually determining the plurality of loop wires 66 to be in a fastening state by a worker, then starting the rotation of the two first motors 21 by the worker through the point touch screen, and starting the grinding work of the wire saw 10.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. Diamond wire saw grinding device, its characterized in that: comprises a base (1) and a discharging component (2), a receiving component (3), a first winding device (4), a second winding device (5), an auxiliary component (6), a polishing component (7), a tensioning component (8) and a waste material cylinder (9) which are respectively arranged on the base, wherein the first winding device (4) and the second winding device (5) are respectively arranged on two sides of the auxiliary component (6), one end of a fretsaw is fixedly connected to the periphery of the discharging component (2), the other end of the fretsaw is sequentially extended to the peripheries of the first winding device (4), the auxiliary component (6), the second winding device (5) and the receiving component (3) after being wound along the periphery of the discharging component (2), the polishing component (7) is arranged above the auxiliary component (6), the tensioning component (8) is arranged below the auxiliary component (6), and the discharging cylinder (9) is positioned below the tensioning component (8), blowing subassembly (2), receive material subassembly (3), auxiliary assembly (6), the equal signal connection of subassembly (7) and tensioning part (8) to controller, garbage bin (9) inside communicates to external exhaust duct.
2. The diamond wire saw grinding device according to claim 1, wherein: receive material subassembly (3) and blowing subassembly (2) the same structure, blowing subassembly (2) include first motor (21) and reel (22), on first motor (21) periphery fixed connection to base (1), the transmission shaft fixed connection of first motor (21) to the one end of reel (22), the one end fixed connection of coping saw to the periphery of reel (22), first motor (21) signal connection to controller.
3. The diamond wire saw grinding device according to claim 1, wherein: first winding device (4) and second winding device (5) structure are the same, and first winding device (4) are including a plurality of first winding wheels and a plurality of second winding wheels of mutual parallel arrangement, first winding wheel is located second winding wheel top, just first winding wheel with second winding wheel staggered distribution.
4. The diamond wire saw grinding device according to claim 3, wherein: first winding wheel with the structure of second winding wheel is the same, first winding wheel includes first axis (41) and first gyro wheel (42), and first axis (41) one end cup joints to base (1) on, and first gyro wheel (42) are cup jointed to the periphery of first axis (41), and first gyro wheel (42) periphery is equipped with and is used for the peripheral first annular (43) of joint coping saw.
5. The diamond wire saw grinding device according to claim 1, wherein: the auxiliary assembly (6) comprises a second motor (61), a third winding wheel (62), a fourth winding wheel (63), a fifth winding wheel (64), a sixth winding wheel (65) and a plurality of loop lines (66), wherein the plurality of loop lines (66) are arranged in parallel, the third winding wheel (62), the fourth winding wheel (63), the fifth winding wheel (64) and the sixth winding wheel (65) are arranged in parallel and are arranged in the inner ring of the loop lines (66), the third winding wheel (62) is arranged above the sixth winding wheel (65), the third winding wheel (62) and the fourth winding wheel (63) are in the same level, the fifth winding wheel (64) and the sixth winding wheel (65) are in the same level, one end of the third winding wheel (62) is provided with the second motor (61), and the second motor (61) is connected to the controller in a signal mode.
6. The diamond wire saw grinding device according to claim 5, wherein: the third winding wheel (62), the fourth winding wheel (63), the fifth winding wheel (64), the sixth winding wheel (65) and a plurality of circular lines (66) have the same structure, the third winding wheel (62) comprises a second middle shaft (621) and a second roller (622), one end of the second middle shaft (621) is provided with a second motor (61), the periphery of the second middle shaft (621) is sleeved with the second roller (622), the periphery of the second roller (622) is provided with a second circular groove (623) and a plurality of third circular grooves (624), the second circular grooves (623) and each third circular groove (624) are arranged in parallel, the second ring groove (623) is positioned in the middle of the second roller (622) and is used for clamping the periphery of the wire saw, a plurality of third ring grooves (624) are distributed on two sides of the second ring groove (623), and each third ring groove (624) is used for clamping the periphery of the loop wire (66), and the third ring grooves (624) correspond to the loop wires (66) one to one.
7. The diamond wire saw grinding device according to claim 5, wherein: the loop wire (66) is made of carborundum wire saw.
8. The diamond wire saw grinding device according to claim 1, wherein: grinding assembly (7) and tensioning assembly (8) structure are the same, grinding assembly (7) includes third motor (71), extension board (72), fastening bolt (73) and grindstone (74), the peripheral fixed connection of third motor (71) is on base (1), the lower extreme of third motor (71) passes through extension board (72) installation grindstone (74), and grindstone (74) are located auxiliary assembly (6) top, the cross section of third extension board (72) is the U-shaped structure, the fastening bolt (73) that are used for compressing tightly grindstone (74) are installed to third extension board (72) one side, third motor (71) signal connection is to the controller.
CN202011568596.7A 2020-12-25 2020-12-25 Diamond fretsaw grinding device Pending CN112571248A (en)

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Publication number Priority date Publication date Assignee Title
CN115008268A (en) * 2021-04-13 2022-09-06 福建铭基新材料科技有限公司 Two-step tensioning rope saw edging machine
CN115008268B (en) * 2021-04-13 2024-02-27 福建铭基新材料科技有限公司 Two-step tensioning rope saw edging machine

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