CN113263362B

CN113263362B - Cutting edge grinding device of transverse scissors and feeding method thereof

Info

Publication number: CN113263362B
Application number: CN202110616285.1A
Authority: CN
Inventors: 周艳
Original assignee: Nanjing Kester Mechanical Equipment Technology Co ltd
Current assignee: Nanjing Kester Mechanical Equipment Technology Co ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-07-01
Anticipated expiration: 2041-06-02
Also published as: CN113263362A

Abstract

The invention provides a cutting edge grinding device of cross scissors, wherein a feeding mechanism of the feeding mechanism comprises a workbench, a bin, a material pushing cylinder and a blocking piece, a plurality of cross scissors are stacked in the bin, the bottom of the bin is oppositely provided with a discharge chute and a material pushing chute, the material pushing cylinder is provided with a push plate, and the material pushing cylinder can drive the push plate to push the cross scissors at the bottommost out of the bin from the discharge chute; a clamping groove for accommodating the blocking piece is formed in the workbench, the blocking piece comprises an elastic piece and a clamping block, a wedge-shaped surface at the top of the clamping block faces one side of the stock bin, the clamping block is pressed into the clamping groove by the transverse shear through the wedge-shaped surface until the assembling hole moves to the position above the clamping groove, and the clamping block is jacked into the assembling hole by the elastic piece to position the transverse shear on the grinding station; grind mechanism includes triaxial slip table, drive arrangement and emery wheel, and drive arrangement is connected with the emery wheel drive formula, and the cutting edge of horizontal scissors on the station is ground to the emery wheel butt to the portable emery wheel of triaxial slip table. The invention has the advantages of labor saving and flexibility in feeding the cross shears, compact equipment structure, small occupied space and high grinding precision.

Description

Cutting edge grinding device of transverse scissors and feeding method thereof

Technical Field

The invention belongs to the technical field of machining, and particularly relates to a cutting edge grinding device of a transverse shear.

Background

The production line of the cross shearing machine mainly comprises a feeding trolley, an uncoiler, a leveler, a feeding mechanism, cross shears, a conveying device, a stacking device and the like.

The transverse scissors are a cutting key mechanism in the transverse shearing machine, and the transverse scissors cut the plate into required width and fixed length and stack the plate. The use of the cross scissors for repeated cutting frequently has high requirements on mechanical strength and the geometric shape of the cutting edge, so that the grinding precision of the cutting edge is also high.

The existing grinding device for the cross scissors generally uses a manipulator for feeding, and the weight and the volume of the cross scissors are large, so that the moving space of the manipulator needs to be reserved, namely the space occupied by equipment is large; and the transverse scissors are easy to shake if not firmly clamped in the grinding process, thereby having adverse effect on the grinding precision.

Disclosure of Invention

The present invention is directed to a blade grinding device of a cross shear to solve the above problems.

The invention provides the following technical scheme:

a blade grinding apparatus for a cross-cut comprising:

the feeding mechanism comprises a workbench, a bin, a pushing cylinder and a blocking piece, wherein the bin is fixed on the workbench, a plurality of cross shears are stacked in the bin, the bottom of the bin is oppositely provided with a discharge chute and a pushing chute, the pushing cylinder is arranged on one side, close to the pushing chute, of the workbench, a push plate is arranged on a piston rod of the pushing cylinder, and the pushing cylinder can drive the push plate to be inserted into the bin through the pushing chute so as to push the cross shears at the bottommost out of the bin through the discharge chute; the blocking piece is positioned on one side, close to the discharge chute, of the workbench, a clamping groove for accommodating the blocking piece is formed in the workbench, the blocking piece comprises an elastic piece and a clamping block which are connected with each other, the top of the clamping block is a wedge-shaped surface, the wedge-shaped surface faces one side of the storage bin, an assembling hole is formed in the cross shear, the clamping block is pressed into the clamping groove through the wedge-shaped surface when the cross shear slides until the assembling hole moves to the position above the clamping groove, and the clamping block is jacked into the assembling hole through the elastic piece to position the cross shear on a grinding station;

grind the mechanism, be located one side of workstation, grind the mechanism and include triaxial slip table, drive arrangement and emery wheel, drive arrangement install in on the triaxial slip table, drive arrangement with the emery wheel drive formula is connected and is rotatory with the drive emery wheel, the triaxial slip table is portable the emery wheel grinds the cutting edge of the horizontal scissors on the station up to the emery wheel butt.

Preferably, in the free state, the height of the fixture block jacked by the elastic member is set as follows: the left side wall and the right side wall of the clamping block extend into the assembling hole.

Preferably, the blocking piece further comprises an electromagnet, the electromagnet is installed at the bottom of the clamping groove and connected with a power supply, a containing groove is formed in the top surface of the electromagnet, the clamping block is an iron block, and the electromagnet attracts the clamping block after being electrified and contracts the elastic piece into the containing groove.

Preferably, the top of the fixture block is covered with a wear-resistant layer made of polytetrafluoroethylene.

The material pressing mechanism comprises a lifting cylinder vertically arranged on the outer side wall of the material bin, a pressing plate is arranged on a piston rod of the lifting cylinder, an auxiliary clamping pin matched with the assembling hole is arranged on the bottom surface of the pressing plate, the lifting cylinder can lower the pressing plate, the pressing plate can press the cross scissors on the grinding station, and meanwhile the auxiliary clamping pin is inserted into the assembling hole of the cross scissors on the grinding station.

Preferably, the length of the auxiliary bayonet is set as follows: the auxiliary clamping pin is inserted into the assembly hole and then can downwards extrude a clamping block in the assembly hole, so that the clamping block is attracted with the electromagnet.

Preferably, the bottom surface of the auxiliary bayonet lock is provided with an inclined surface attached to the wedge-shaped surface.

Furthermore, a window for arranging materials is arranged on the side wall of the storage bin, and the window penetrates through the side wall of the storage bin in the vertical direction and is communicated with the material pushing groove.

Furthermore, a photoelectric sensor is installed on the side wall of the window, a measuring head of the photoelectric sensor faces the interior of the stock bin, and the photoelectric sensor is used for detecting whether the stock bin is short of materials; the photoelectric sensor is connected with a controller, and the controller is connected with the material pushing cylinder and the lifting cylinder.

Further, a blanking cylinder is further mounted on the workbench and used for pushing the ground transverse scissors out of the grinding station; and a piston rod of the blanking cylinder is provided with a push block, and the moving direction of the push block is vertical to that of the push plate.

The working process of the blade grinding device of the transverse scissors comprises the following steps:

stacking a plurality of cross scissors in a storage bin;

the material pushing cylinder is started, the push plate is driven to push the transverse scissors at the bottommost part of the stock bin out of the stock bin from the material discharging groove, the clamping block is pressed into the clamping groove along the wedge-shaped surface when the transverse scissors pass through the clamping block, and the clamping block cannot block the transverse scissors;

the transverse scissors continue to be pushed forwards by the push plate until the assembly hole is positioned right above the clamping groove, the clamping block is jacked into the assembly hole by the elastic piece, and the transverse scissors are blocked and positioned on the grinding station;

starting a lifting cylinder, driving a pressing plate to move downwards to press the cross shears, simultaneously inserting the auxiliary clamping pin into the assembly hole, transferring the positioning effect on the cross shears to the auxiliary clamping pin, and downwards extruding the clamping block by the auxiliary clamping pin, so that the electromagnet is electrified, and the clamping block is smoothly attracted with the electromagnet;

the three-axis sliding table moves the grinding wheel, and the driving device is started to drive the grinding wheel to rotate so as to grind the blade of the cross scissors;

after the grinding is finished, the lifting cylinder resets the pressing plate upwards to push the transverse scissors away from the grinding station; this is repeated to start the next polishing cycle.

The invention has the beneficial effects that:

according to the invention, the transverse scissors are cached in the bin, the discharge chute and the material pushing chute are arranged at the bottom of the bin, the transverse scissors are sequentially pushed out of the bin from the discharge chute through the material pushing cylinder and sent to the grinding station in front, the structure replaces a manipulator to grab the transverse scissors for feeding, the structure is compact, and the equipment cost is reduced; the structure replaces a sucker for feeding, and the sucker is not easy to be firmly sucked because the self weight of the transverse scissors is large, so that the feeding can be completed only by pushing the transverse scissors, the feeding action of the transverse scissors is more stable and reliable, and the occupied space of the equipment is small.

The invention uses the blocking piece to accurately position the transverse scissors on the grinding station, and ensures the grinding precision of the grinding mechanism to the cutting edge. The blocking piece comprises an elastic piece and a clamping block which are connected with each other, the top of the clamping block is a wedge-shaped surface, the wedge-shaped surface faces one side of the stock bin, an assembly hole is formed in the transverse scissors, the clamping block is pressed into the clamping groove through the wedge-shaped surface when the transverse scissors slide, the transverse scissors move right above the clamping groove until the assembly hole, the pressure of the transverse scissors to the clamping block disappears, the clamping block is upwards pushed into the assembly hole through the elastic piece so as to position the transverse scissors on a grinding station, and the transverse scissors are prevented from continuously moving forwards.

The material pressing mechanism presses the transverse scissors in the grinding process, so that the transverse scissors are prevented from shaking, and the grinding operation is guaranteed to be completed smoothly. An auxiliary bayonet lock is arranged at the bottom of a pressure plate of the material pressing mechanism, so that on one hand, the transverse scissors can be positioned in an auxiliary manner, and the transverse scissors are prevented from moving back and forth; on the other hand, the fixture block is more smoothly sucked by the electromagnet below under the pressure action of the auxiliary bayonet lock, after the grinding is finished, the pressure plate and the auxiliary bayonet lock reset upwards to be separated from the assembly hole, and at the moment, as the blocking action of the fixture block disappears, the cross scissors can be freely pushed on the workbench, and the blanking action is easier and more convenient.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the blocking member of the present invention;

FIG. 3 is a schematic view showing a structure in which a latch of the blocking member of the present invention is pressed down by the auxiliary latch;

FIG. 4 is a schematic view of the interior of the storage bin of the present invention from above;

FIG. 5 is a schematic diagram showing the positional relationship between the blanking cylinder and the cross shears of the present invention.

Labeled in the figure as: 1. a horizontal scissors; 2. a blade; 3. an assembly hole; 4. a work table; 5. a storage bin; 6. a material pushing cylinder; 7. a blocking member; 8. a discharge chute; 9. a material pushing groove; 10. pushing the plate; 11. a grinding station; 12. a card slot; 13. an elastic member; 14. a clamping block; 15. a wedge-shaped surface; 16. a wear resistant layer; 17. a three-axis sliding table; 18. a drive device; 19. a grinding wheel; 20. an electromagnet; 21. a containing groove; 22. a lifting cylinder; 23. pressing a plate; 24. an auxiliary bayonet lock; 25. a blanking cylinder; 26. a push block; 27. a window; 28. a photoelectric sensor.

Detailed Description

Example 1

As shown in figure 1, the cutting edge grinding device of the cross shears is used for grinding the cutting edge of a cross shear blank of a cross shear, as shown in figure 4, one or more assembly holes 3 are formed in the cross shears 1, and the cross shears 1 are assembled on the cross shear through the assembly holes 3. The device comprises a feeding mechanism, a grinding mechanism and a pressing mechanism.

The feeding mechanism comprises a workbench 4, a bin 5, a pushing cylinder 6 and a blocking piece 7.

On feed bin 5 welding or spiro union were fixed in workstation 4, can pile up a plurality of horizontal scissors 1 in the feed bin 5, the storehouse body cross section structure and the horizontal scissors profile modeling of feed bin 5, its top is uncovered, and horizontal scissors 1 can drop into in the feed bin from the top of feed bin 5. The bottom of the bin 5 is oppositely provided with a discharge chute 8 and a material pushing chute 9, the discharge chute 8 and the material pushing chute 9 both extend downwards to the table top of the workbench 4, and the heights of the discharge chute 8 and the material pushing chute 9 are slightly larger than the thickness of the cross scissors 1 and are smaller than twice of the thickness of the cross scissors 1, so that only one cross scissors 1 passes through the discharge chute 8 at each time.

The material pushing cylinder 6 is horizontally arranged on one side, close to the material pushing groove 9, of the workbench 4, namely the right side of the workbench in fig. 1, a horizontal push plate 10 is arranged on a piston rod of the material pushing cylinder 6, the thickness of the push plate 10 is equal to that of the transverse scissors 1, the material pushing cylinder 6 can drive the push plate 10 to be inserted into the stock bin 5 through the material pushing groove 9, and the transverse scissors at the bottommost are pushed out of the stock bin 5 through the material discharging groove 8. Positioning baffles (not shown in the figure) can be arranged on the front side and the rear side of the push plate 10 on the workbench 4 to limit the left and right movement of the push plate 10, so that the movement precision of the push plate 10 is ensured.

As shown in fig. 2, the blocking member 7 is located on the side of the worktable 4 near the discharging chute 8, and is used for blocking the transverse shears 1 pushed by the material pushing cylinder 6 and accurately positioning the transverse shears 1 on the grinding station 11. A clamping groove 12 for accommodating the blocking part 7 is formed in the workbench 4, the blocking part 7 comprises an elastic part 13 and a clamping block 14 which are connected with each other, the elastic part 13 can be a compression spring or other elastic parts, and the elastic part 13 is fixedly arranged at the bottom of the clamping block 14. The wedge-shaped surface 15 is arranged at the top of the clamping block 14, the wedge-shaped surface 15 faces one side of the stock bin 5, the clamping block 14 is pressed into the clamping groove 12 along the wedge-shaped surface 15 when the cross scissors 1 slides, the cross scissors 1 can continue to move leftwards until the assembling hole 3 moves right above the clamping groove 12, at the moment, the pressure of the cross scissors 1 on the clamping block 14 disappears, the clamping block 14 is pushed into the assembling hole 3 by the elastic piece 13 to clamp the cross scissors 1, and then the cross scissors 1 is positioned on the grinding station 11. The jacking height of the fixture block 14 at this time is: the left side wall and the right side wall of the clamping block 14 both extend into the assembling hole 3, and the right side wall of the clamping block 14 also extends into the assembling hole 3 and can abut against the right side of the assembling hole 3, so that the cross shear 1 is prevented from downwards extruding the wedge-shaped surface 15 from the right side of the clamping block 14 under the inertia effect to press down the clamping block 14 again, and the reliable positioning of the clamping block 14 on the cross shear 1 is realized. The wedge-shaped surface 15 of the fixture block 14 is covered with a wear-resistant layer 16 made of polytetrafluoroethylene.

As shown in fig. 1 and 3, the blocking member 7 further includes an electromagnet 20, the electromagnet 20 is fixedly installed at the bottom of the slot 12 and connected to a power supply, a recessed accommodating slot 21 is formed in the top of the electromagnet 20, the fixture block 14 is an iron block, when the blade is ground, the switch is turned on to supply power to the electromagnet 20, the electromagnet 20 attracts the fixture block 14 above the electromagnet 20, the fixture block 14 is retracted into the slot 12, and the fixture block 14 downwardly extrudes the elastic member 13 to retract the elastic member 13 into the accommodating slot 21. At this time, the fixture blocks 14 do not block the cross scissors any more, so that the cross scissors can be fed from the grinding station 11 only by pushing the cross scissors, a manipulator is not needed for carrying the cross scissors, and the feeding process is easy and convenient.

As shown in fig. 1, the grinding mechanism is located on the left side of the workbench 4, the grinding mechanism includes a three-axis sliding table 17, a driving device 18 and a grinding wheel 19, the driving device 18 is installed on the three-axis sliding table 17, the driving device 18 selects a servo motor, the driving device 18 is in driving connection with the grinding wheel 19 to drive the grinding wheel to rotate, the three-axis sliding table 17 can move the grinding wheel 19 until the grinding wheel 19 abuts against the blade 2 of the cross shears on the grinding station 11, and the blade 2 starts to be ground.

This embodiment still includes swager constructs, and swager constructs including installing the lift cylinder 22 on 5 lateral walls of feed bin vertically, installs clamp plate 23 on lift cylinder 22's the piston rod, and lift cylinder 22 can drop clamp plate 23, makes clamp plate 23 compress tightly horizontal scissors 1 on the grinding station 11, prevents to take place to rock horizontal scissors 1 in grinding process, guarantees the grinding precision.

The auxiliary clamping pin 24 matched with the assembling hole 3 is installed on the bottom surface of the pressing plate 23, and when the pressing plate 23 presses the cross shears 1, the auxiliary clamping pin 24 is inserted into the assembling hole 3 of the cross shears on the grinding station so as to assist the clamping block 14 to position the cross shears 1.

Wherein, as shown in fig. 3, the length of the auxiliary bayonet 24 is set as: after the auxiliary clamping pin 24 is inserted into the assembling hole 3, the clamping block 14 in the assembling hole 3 is extruded downwards, so that the clamping block 14 is quickly attracted with the electromagnet 20 under the combined action of mechanical pressure and magnetic field attraction, and the action is more reliable and smooth. After the auxiliary clamping pin 24 is removed from the assembling hole 3, the clamping block 14 is still adsorbed by the electromagnet 20, and at the moment, the transverse scissor 1 can be quickly pushed away from the workbench 4 along the horizontal direction.

The bottom surface of the auxiliary bayonet 24 is an inclined surface attached to the wedge-shaped surface 15, and the inclined surface is closely attached to the wedge-shaped surface 15 of the fixture block to more stably extrude the fixture block 14.

As shown in fig. 5, a blanking cylinder 25 is mounted on the worktable 4 for pushing the cross shears with the ground cutting edges out of the grinding station 11; the piston rod of the blanking cylinder 25 is provided with a push block 26, and the moving direction of the push block 26 is vertical to the moving direction of the push plate 10.

The grinding method of the blade grinding device of the transverse scissors comprises the following steps:

a plurality of cross shears 1 are piled up and placed in a stock bin 5;

the material pushing cylinder 6 is started, the push plate 10 is driven to push the cross scissors 1 at the bottommost part of the stock bin 5 out of the stock bin 5 through the discharge chute 8, and the cross scissors 1 press the clamping block 14 into the clamping groove 12 along the wedge-shaped surface 15 when passing through the clamping block 14;

the cross scissors 1 are continuously pushed forwards by the push plate 10 until the assembly hole 3 is positioned right above the clamping groove 12, the clamping block 14 is pushed into the assembly hole 3 by the elastic piece 13, and the cross scissors 1 are blocked and positioned on the grinding station 11;

starting the lifting cylinder 22, driving the pressing plate 23 to move downwards to press the cross shears 1, simultaneously inserting the auxiliary clamping pin 24 into the assembly hole 3, transferring the positioning effect on the cross shears to the auxiliary clamping pin, and downwards extruding the fixture block 14 by the auxiliary clamping pin 24 to enable the electromagnet 20 to be electrified, wherein the fixture block 14 is smoothly sucked by the electromagnet 20 under the combined action of the pressure of the auxiliary clamping pin 24 and the attraction force of the electromagnet 20;

the three-axis sliding table 17 moves the grinding wheel 19, and the driving device 18 is started to drive the grinding wheel 19 to rotate so as to grind the blade 2 of the cross shear; the coordinate position of the grinding wheel is changed by the three-axis sliding table 17 according to the grinding path, and the grinding of the cutting edge is completed;

after the grinding is finished, the lifting cylinder 22 resets the pressing plate 23 upwards;

the blanking cylinder 25 pushes the cross shears 1 away from the grinding station 11, the electromagnet 20 is powered off, and the fixture block 14 is pushed out of the fixture groove 12 under the action of the pushing force of the elastic piece 13;

this is repeated, and the next polishing cycle is started.

Example 2

The present embodiment is different from embodiment 1 in that, first, as shown in fig. 4, a window 27 for arranging the material is provided on a side wall of the bin 5, the window 27 penetrates through the side wall of the bin 5 in the vertical direction and is communicated with the material pushing groove 9, and the transverse scissors in the bin 5 can be manually and flexibly arranged through the window 27, so as to prevent the transverse scissors from being stacked unevenly.

Secondly, a photoelectric sensor 28 is installed on the side wall of the window 27, a detection head of the photoelectric sensor 28 faces the interior of the stock bin 5, the installation height of the photoelectric sensor is positioned at the position of 2 nd or 3 rd cross scissors counted from the bottom of the stock bin 5, and the photoelectric sensor 28 is used for detecting whether the stock bin 5 is short of materials or not so as to prompt an operator to supplement materials in time; the photoelectric sensor 28 is connected with a controller, and the controller is connected with an alarm, the material pushing cylinder 6 and the lifting cylinder 22. When the photoelectric sensor 28 detects that the material in the bin 5 is about to be short of the material, the controller starts an alarm to give an alarm, and stops starting the material pushing cylinder 6 and the lifting cylinder 22, and the material is not fed any more. The alarm is arranged on the workbench.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cutting edge grinding device of a transverse shear, comprising:

the grinding mechanism is positioned on one side of the workbench and comprises a three-shaft sliding table, a driving device and a grinding wheel, the driving device is mounted on the three-shaft sliding table, the driving device is in driving connection with the grinding wheel so as to drive the grinding wheel to rotate, and the three-shaft sliding table can move the grinding wheel until the grinding wheel abuts against the cutting edge of a cross shear on a grinding station;

under the free state, the fixture block is set to be by the jack-up height of elastic component: the left side wall and the right side wall of the clamping block extend into the assembling hole;

the blocking piece further comprises an electromagnet, the electromagnet is installed at the bottom of the clamping groove and connected with a power supply, an accommodating groove is formed in the top surface of the electromagnet, the clamping block is an iron block, the electromagnet attracts the clamping block after being electrified, and the elastic piece is retracted into the accommodating groove;

still include swager structure, swager structure include vertically install in lift cylinder on the feed bin lateral wall, install the clamp plate on the piston rod of lift cylinder, the bottom surface installation of clamp plate with the supplementary bayonet lock of pilot hole adaptation, the lift cylinder can descend the clamp plate makes the cross scissors on the grinding station is pushed down to the clamp plate, makes simultaneously supplementary bayonet lock inserts in the pilot hole of the cross scissors on the grinding station, extrudes the fixture block in the pilot hole downwards.

2. The blade grinder of cross shears according to claim 1, wherein the length of the auxiliary pin is set to: the auxiliary clamping pin can downwards extrude a clamping block in the assembling hole after being inserted into the assembling hole, so that the clamping block is attracted with the electromagnet.

3. The apparatus as claimed in claim 1, wherein the auxiliary locking unit has a slope formed on a bottom surface thereof to be engaged with the wedge surface.

4. The blade grinding device of the cross shears according to claim 1, wherein a window for material arrangement is arranged on the side wall of the storage bin, and the window penetrates through the side wall of the storage bin in the vertical direction and is communicated with the material pushing groove.

5. The blade grinding device of the cross shears according to claim 4, wherein a photoelectric sensor is mounted on a side wall of the window, a measuring head of the photoelectric sensor faces the interior of the stock bin, and the photoelectric sensor is used for detecting whether the stock bin is short of materials; the photoelectric sensor is connected with a controller, and the controller is connected with the material pushing cylinder and the lifting cylinder.

6. The apparatus for grinding the blade of a horizontal shears according to claim 1, wherein a blanking cylinder is further installed on the worktable for horizontally pushing the ground horizontal shears out of the grinding station; and a piston rod of the blanking cylinder is provided with a push block, and the moving direction of the push block is vertical to that of the push plate.

7. A method for feeding a cross-shear blade grinding device, which is implemented by the blade grinding device of any one of claims 1 to 6, comprising the steps of:

stacking a plurality of cross scissors in a storage bin;

starting a material pushing cylinder, driving a push plate to push a transverse scissor at the bottommost part of the bin out of the bin from a discharge chute, and pressing a clamping block into a clamping groove along a wedge-shaped surface when the transverse scissor passes through the clamping block;

starting a lifting cylinder, driving a pressing plate to move downwards to press the cross shears, simultaneously inserting the auxiliary clamping pins into the assembly holes, transferring the positioning effect on the cross shears to the auxiliary clamping pins, and downwards extruding the clamping blocks by the auxiliary clamping pins to ensure that the electromagnet is electrified and the clamping blocks are smoothly attracted with the electromagnet;

after the grinding is finished, the lifting cylinder resets the pressing plate upwards to push the transverse scissors away from the grinding station; then the electromagnet is powered off to release the clamping block; this is repeated, and the next polishing cycle is started.