CN218110936U - Rubber product cutting device - Google Patents

Abstract

The utility model discloses a rubber product cutting device in the technical field of rubber product processing, which comprises a base plate, wherein the rear end of the left side of the upper end surface of the base plate is fixedly connected with a third clamping block, the front end of the left side of the upper end surface of the base plate is slidably connected with a first clamping block through a chute, the front end and the rear end of the right side of the upper end surface of the base plate are respectively slidably connected with a second clamping block and a fourth clamping block, the left side of the upper end surface of the mounting plate is fixedly connected with a second motor, the output end of the second motor is fixedly connected with a mounting block through a first rotating shaft, the lower end surface of the mounting block is fixedly connected with a cutting blade, and the middle part of the right side of the upper end surface of the base plate is fixedly connected with a dust collection box; the cutting position and the cutting angle can be flexibly adjusted, and the cutting precision is high; the cutting device can collect and scrape the scraps generated during cutting, thereby avoiding environmental pollution and saving the process of manually cleaning the dust collection box.

Description

Rubber product cutting device

Technical Field

The utility model relates to a rubber component processing technology field specifically is a rubber component cutting device.

Background

The rubber products refer to the activities of producing various rubber products by using natural and synthetic rubbers as raw materials, and also include the rubber products reproduced by using waste rubbers, the yield of the synthetic rubbers is greatly superior to that of the natural rubbers, wherein the maximum yield is styrene butadiene rubber

However, the existing rubber product cutting device is inconvenient to play a clamping and pressing effect on rubber plates with different sizes and thicknesses, so that the rubber plates are easy to shift in the cutting process, and the cutting efficiency is influenced; the cutting position and the cutting angle are inconvenient to flexibly adjust, so that the cutting precision is poor; moreover, the chips generated in the cutting process are inconvenient to collect and automatically scrape to obtain the cleaning effect, so that the chips fly to pollute the environment, and manual cleaning of the dust collection box wastes time and labor.

Based on this, the utility model designs a rubber products cutting device to solve above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides a following technical scheme:

the utility model provides a rubber product cutting device, includes the bottom plate, bottom plate up end left side rear end fixedly connected with third grip block, bottom plate up end left side front end has first grip block through spout sliding connection, both ends sliding connection has second grip block and fourth grip block respectively around the bottom plate up end right side, first grip block, second grip block, third grip block, fourth grip block inboard have the clamp plate through spout sliding connection, the equal fixedly connected with first slide bar of third grip block, fourth grip block front end and first grip block right-hand member face, first slide bar sliding connection has first sliding sleeve, bottom plate up end rear side fixedly connected with recess board, the inboard sliding connection of recess board has the L template, the L template inboard has electric telescopic handle through thread block sliding connection, electric telescopic handle piston end fixedly connected with mounting panel, terminal surface left side fixedly connected with second motor under the mounting panel, the second motor output passes through first pivot fixedly connected with installation piece, terminal surface fixedly connected with cutting blade under the installation piece, bottom plate up end right side middle part fixedly connected with dust collection box.

As a further scheme of the utility model, first sliding sleeve is kept away from the one end fixedly connected with of first slide bar first grip block and second grip block, the terminal surface right side is rotated through the round pin axle before the second grip block and is connected with first connecting rod, first connecting rod right-hand member is rotated through the round pin axle and is connected with the second connecting rod, second connecting rod right-hand member is rotated through the round pin axle and is connected with the movable plate.

As a further scheme of the utility model, the movable plate upper end is rotated and is connected with the second worm, the second worm is connected with through second worm wheel and round pin axle meshing the second connecting rod, movable plate up end front side middle part is rotated through the round pin axle and is connected with the third connecting rod, the third connecting rod front end is rotated through the round pin axle and is connected with the fourth connecting rod, the fourth connecting rod front end is rotated through the round pin axle and is connected with the bottom plate, the fourth connecting rod front end is connected with the third worm through round pin axle and third worm wheel meshing, the third worm front end is rotated and is connected with the bottom plate.

As a further scheme of the utility model, the equal fixedly connected with connecting plate of clamp plate up end of both ends and right side rear end about the front side, left side rear end clamp plate up end fixedly connected with rack, the equal fixedly connected with second slide bar of terminal surface before terminal surface, left side front end connecting plate right-hand member face, the right side rear end connecting plate, second slide bar sliding connection has the second sliding sleeve, the second sliding sleeve is kept away from the equal fixedly connected with connecting plate of one end of second slide bar, rack toothing is connected with the gear, the gear is connected with a section board through the round pin axle rotation, a section board rotates and is connected with first worm, first worm is connected with the gear through round pin axle and first worm wheel meshing.

As a further scheme of the utility model, recess board left end face fixedly connected with third motor, third motor output has through first threaded rod threaded connection the L template, the first motor of terminal surface fixedly connected with before the L template, first motor output fixedly connected with second threaded rod, second threaded rod threaded connection has electric telescopic handle.

As a further scheme of the utility model, mounting panel right-hand member intercommunication has the hose, the hose right-hand member has through the air exhauster intercommunication the dust collection box, the chamber wall rear end face in the dust collection box is connected with the sprocket through the round pin hub rotation, the sprocket meshing is connected with the chain, chain front end downside middle part is connected with the scraper blade through the round pin hub rotation, scraper blade upper end middle part sliding connection has the third sliding sleeve, there is the dust collection box third sliding sleeve upper end through spout sliding connection.

As a further proposal of the utility model, the left upper end of the rear end face of the dust collection box is fixedly connected with a fourth motor, the output end of the fourth motor is fixedly connected with the chain wheel through a pin shaft, and the lower side of the right end of the dust collection box is slidably connected with a collection box.

Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

1. the rubber plate is placed on the upper end face of the bottom plate, one corner of the rubber plate is aligned to the third clamping block and attached, then the third worm and the third worm wheel are rotated to drive the fourth connecting rod and the third connecting rod to rotate, the movable plate is moved backwards, the first clamping block is attached to one corner of the rubber plate, then the second worm is rotated to drive the second worm wheel and the second connecting rod to rotate, the second connecting rod drives the second clamping block to move through the first connecting rod, the second clamping block and the fourth clamping block clamp two corners of the right end of the rubber plate, then the first worm is rotated to drive the first worm wheel to rotate, the first worm wheel drives the gear to rotate through the pin shaft, the gear drives the four pressing plates to descend simultaneously through the rack, the rubber plate can be compressed, the rubber plates with different sizes and different thicknesses can be clamped and fixed conveniently, and the stability in the cutting process is guaranteed.

2. Drive first threaded rod through starting the third motor and rotate, first threaded rod drives and controls about the L template, the position of the left and right sides direction of adjusting cutting blade, then start first motor and drive the rotation of second threaded rod, adjust the front and back position of cutting blade, then start electric telescopic handle and adjust the height of cutting blade, then start the second motor, the second motor drives the installation piece and rotates, adjust the angle of cutting blade, thereby be more convenient for carry out nimble regulation to the position of cutting and the angle of cutting, and then make and cut more accurately, holistic efficiency of cutting has been improved.

3. Through starting the air exhauster, extract the piece that produces among the cutting process, enter into to the dust collection box through the hose inside, then start the fourth motor, drive sprocket and chain rotation, make the chain drive the scraper blade and remove, the scraper blade follows the chain and removes, and simultaneously, the scraper blade slides in the third sliding sleeve inboard, third sliding sleeve upper end horizontal slip, make the scraper blade scrape from the left right side and get the piece, make the piece fall into inside the collection box, then will collect the box and take off can, thereby it plays a collection and the effect of clearance to the piece that produces among the cutting process to be more convenient for, the piece polluted environment has been avoided, and the process of artifical manual clearance dust collection box has been saved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

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

FIG. 2 is an enlarged schematic view of the area A of FIG. 1 according to the present invention;

FIG. 3 is an enlarged schematic view of the area B of FIG. 1 according to the present invention;

FIG. 4 is a schematic view of the left side of the present invention;

FIG. 5 is a schematic view of a partial three-dimensional structure of the dust box of the present invention;

FIG. 6 is a schematic view of a partial three-dimensional structure of a fourth clamping block of the present invention;

fig. 7 is a schematic bottom view of a partial three-dimensional structure of the L-shaped plate of the present invention;

FIG. 8 is a rear perspective view of the dust box of the present invention;

fig. 9 is a semi-sectional view of the dust box of the present invention.

In the drawings, the reference numbers indicate the following list of parts:

1. a base plate; 2. a groove plate; 3. an L-shaped plate; 4. a first motor; 5. an electric telescopic rod; 6. mounting a plate; 7. a hose; 8. a second motor; 9. a first rotating shaft; 10. mounting blocks; 11. cutting a blade; 12. a first slide bar; 13. a first sliding sleeve; 14. a second slide bar; 15. a second sliding sleeve; 16. a third motor; 17. a first threaded rod; 18. a rack; 19. pressing a plate; 20. a gear; 21. folding the template; 22. a first worm gear; 23. a first worm; 24. a first clamping block; 25. a connecting plate; 26. a second clamping block; 27. a first link; 28. a second link; 29. a second worm; 30. a second worm gear; 31. moving the plate; 32. a third link; 33. a fourth link; 34. a third worm; 35. a dust collection box; 36. a third sliding sleeve; 37. a squeegee; 38. a chain; 39. a sprocket; 40. a collection box; 41. a second threaded rod; 42. a fourth motor; 43. an exhaust fan; 44. a third clamping block; 45. a fourth clamping block; 46. a third worm gear.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-9, the present invention provides a technical solution:

the utility model provides a rubber product cutting device, comprising a base plate 1, 1 up end left side rear end fixedly connected with third grip block 44 of bottom plate, 1 up end left side front end of bottom plate has first grip block 24 through spout sliding connection, both ends sliding connection has second grip block 26 and fourth grip block 45 respectively around 1 up end right side of bottom plate, first grip block 24, second grip block 26, third grip block 44, fourth grip block 45 inboard has clamp plate 19 through spout sliding connection, third grip block 44, fourth grip block 45 front end and the equal fixedly connected with first slide bar 12 of first grip block 24 right-hand member face, first slide bar 12 sliding connection has first sliding sleeve 13, 1 up end rear side fixedly connected with recess board 2 of bottom plate, recess board 2 inboard sliding connection has L template 3, 3 inboard has electric telescopic handle 5 through the threaded block sliding connection of L template, electric telescopic handle 5 piston end fixedly connected with mounting panel 6, terminal surface left side fixedly connected with second motor 8 under mounting panel 6, the output of second motor 8 has mounting block 10 through first pivot 9 fixedly connected with, mounting block 10 lower terminal surface fixedly connected with 11 bottom plate right side fixed connection has dust collection box right side fixed blade 35 middle part of bottom plate.

As a still further embodiment of the present invention: one end of the first sliding sleeve 13 far away from the first sliding rod 12 is fixedly connected with a first clamping block 24 and a second clamping block 26, the right side of the front end face of the second clamping block 26 is rotatably connected with a first connecting rod 27 through a pin shaft, the right end of the first connecting rod 27 is rotatably connected with a second connecting rod 28 through a pin shaft, and the right end of the second connecting rod 28 is rotatably connected with a moving plate 31 through a pin shaft. The upper end of the moving plate 31 is rotatably connected with a second worm 29, the second worm 29 is meshed with a second connecting rod 28 through a second worm wheel 30 and a pin shaft, the middle of the front side of the upper end face of the moving plate 31 is rotatably connected with a third connecting rod 32 through a pin shaft, the front end of the third connecting rod 32 is rotatably connected with a fourth connecting rod 33 through a pin shaft, the front end of the fourth connecting rod 33 is rotatably connected with the bottom plate 1 through a pin shaft, the front end of the fourth connecting rod 33 is meshed with a third worm 34 through a pin shaft and a third worm wheel 46, and the front end of the third worm 34 is rotatably connected with the bottom plate 1. The upper end face of a pressing plate 19 at the left end, the right end and the right rear end of the front side is fixedly connected with a connecting plate 25, the upper end face of the pressing plate 19 at the rear end of the left side is fixedly connected with a rack 18, the front end face of the rack 18, the right end face of the connecting plate 25 at the front end of the left side and the right end of the connecting plate 25 at the rear end of the right side are fixedly connected with a second slide bar 14, the second slide bar 14 is slidably connected with a second sliding sleeve 15, one end, away from the second slide bar 14, of the second sliding sleeve 15 is fixedly connected with the connecting plate 25, the rack 18 is connected with a gear 20 in a meshing manner, the gear 20 is connected with a folding plate 21 through a pin shaft in a rotating manner, the folding plate 21 is connected with a first worm 23 in a rotating manner, and the first worm 23 is connected with the gear 20 through a pin shaft and a first worm wheel 22 in a meshing manner. The rubber plate is placed on the upper end face of the bottom plate 1, one corner of the rubber plate is aligned to and attached to the third clamping block 44, then the third worm 34 and the third worm wheel 46 are rotated to drive the fourth connecting rod 33 and the third connecting rod 32 to rotate, the moving plate 31 is moved backwards, the first clamping block 24 is attached to one corner of the rubber plate, then the second worm 29 is rotated to drive the second worm wheel 30 and the second connecting rod 28 to rotate, the second connecting rod 28 drives the second clamping block 26 to move through the first connecting rod 27, the second clamping block 26 and the fourth clamping block 45 clamp two corners of the right end of the rubber plate, then the first worm 23 is rotated to drive the first worm wheel 22 to rotate, the first worm wheel 22 drives the gear 20 to rotate through a pin shaft, the gear 20 drives the four pressing plates 19 to descend simultaneously through the rack 18, the rubber plate can be compressed, and therefore the rubber plates with different sizes and different thicknesses can be clamped and fixed conveniently, and stability in the cutting process is further guaranteed.

As a still further embodiment of the present invention: the left end face of the groove plate 2 is fixedly connected with a third motor 16, the output end of the third motor 16 is connected with an L-shaped plate 3 through a first threaded rod 17 in a threaded mode, the front end face of the L-shaped plate 3 is fixedly connected with a first motor 4, the output end of the first motor 4 is fixedly connected with a second threaded rod 41, and the second threaded rod 41 is connected with an electric telescopic rod 5 in a threaded mode. Drive first threaded rod 17 through starting third motor 16 and rotate, first threaded rod 17 drives and controls about L template 3, adjust the position of the left and right directions of cutting blade 11, then start first motor 4 and drive second threaded rod 41 and rotate, adjust the front and back position of cutting blade 11, then start electric telescopic handle 5 and adjust the height of cutting blade 11, then start second motor 8, second motor 8 drives installation piece 10 and rotates, adjust the angle of cutting blade 11, thereby be more convenient for carry out nimble regulation to the position of cutting and cutting angle, and then make and cut more accurately, the holistic efficiency of cutting has been improved.

As a still further embodiment of the present invention: the right end of the mounting plate 6 is communicated with a hose 7, the right end of the hose 7 is communicated with a dust collection box 35 through an exhaust fan 43, the rear end face of the inner cavity wall of the dust collection box 35 is rotatably connected with a chain wheel 39 through a pin shaft, the chain wheel 39 is meshed with a chain 38, the middle of the lower side of the front end of the chain 38 is rotatably connected with a scraping plate 37 through a pin shaft, the middle of the upper end of the scraping plate 37 is slidably connected with a third sliding sleeve 36, and the upper end of the third sliding sleeve 36 is slidably connected with the dust collection box 35 through a sliding groove. The upper end of the left side of the rear end face of the dust collection box 35 is fixedly connected with a fourth motor 42, the output end of the fourth motor 42 is fixedly connected with a chain wheel 39 through a pin shaft, and the lower side of the right end of the dust collection box 35 is slidably connected with a collection box 40. Through starting air exhauster 43, extract the piece that produces in the cutting process, enter into to dust collection box 35 inside through hose 7, then start fourth motor 42, drive sprocket 39 and chain 38 and rotate, make chain 38 drive scraper 37 remove, scraper 37 follows chain 38 and removes, and simultaneously, scraper 37 slides in third sliding sleeve 36 inboard, third sliding sleeve 36 upper end horizontal slip, make scraper 37 scrape from the left side right side and get the piece, make the piece fall into inside collection box 40, then will collect box 40 and take off can, thereby be more convenient for play the effect of a collection and clearance to the piece that produces in the cutting process, the piece polluted environment has been avoided, and the process of artifical manual clearance dust collection box 35 has been saved.

The utility model discloses a theory of operation is: when the utility model is used, firstly, the rubber plate is placed on the upper end surface of the bottom plate 1, one corner of the rubber plate is aligned with the third clamping block 44 and is attached, then the third worm 34 and the third worm wheel 46 are rotated to drive the fourth connecting rod 33 and the third connecting rod 32 to rotate, the movable plate 31 is moved backwards, the first clamping block 24 is attached to one corner of the rubber plate, then the second worm 29 is rotated to drive the second worm wheel 30 and the second connecting rod 28 to rotate, the second connecting rod 28 drives the second clamping block 26 to move through the first connecting rod 27, the second clamping block 26 and the fourth clamping block 45 clamp two corners of the right end of the rubber plate, then the first worm 23 is rotated to drive the first worm wheel 22 to rotate, the first worm wheel 22 drives the gear 20 to rotate through the pin shaft, the gear 20 drives the four pressing plates 19 to descend simultaneously through the rack 18, the rubber plate can be pressed tightly, thereby being more convenient for clamping and fixing the rubber plates with different sizes and different thicknesses, and further ensuring the stability in the cutting process; then, the third motor 16 is started to drive the first threaded rod 17 to rotate, the first threaded rod 17 drives the L-shaped plate 3 to move left and right, the position of the cutting blade 11 in the left and right direction is adjusted, then the first motor 4 is started to drive the second threaded rod 41 to rotate, the front and back positions of the cutting blade 11 are adjusted, then the electric telescopic rod 5 is started to adjust the height of the cutting blade 11, then the second motor 8 is started, the second motor 8 drives the mounting block 10 to rotate, and the angle of the cutting blade 11 is adjusted, so that the cutting position and the cutting angle can be adjusted flexibly, the cutting is more accurate, and the overall cutting efficiency is improved; in the cutting process, the exhaust fan 43 is started, the scraps generated in the cutting process are extracted, the scraps enter the dust collection box 35 through the hose 7, then the fourth motor 42 is started, the chain wheel 39 and the chain 38 are driven to rotate, the chain 38 drives the scraper 37 to move, the scraper 37 moves along with the chain 38, meanwhile, the scraper 37 slides on the inner side of the third sliding sleeve 36, the upper end of the third sliding sleeve 36 slides leftwards and rightwards, the scraper 37 scrapes the scraps from the left to the right, the scraps fall into the collection box 40, and then the collection box 40 is taken down, so that the scraps generated in the cutting process can be collected and cleaned more conveniently, the environment pollution caused by the scraps is avoided, and the process of manually cleaning the dust collection box 35 is omitted.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (7)

1. A rubber product cutting device, includes bottom plate (1), its characterized in that: the cutting device is characterized in that a third clamping block (44) is fixedly connected to the rear end of the left side of the upper end face of the bottom plate (1), a first clamping block (24) is connected to the front end of the left side of the upper end face of the bottom plate (1) in a sliding mode through a sliding groove, a second clamping block (26) and a fourth clamping block (45) are respectively connected to the front end and the rear end of the right side of the upper end face of the bottom plate (1) in a sliding mode through a sliding groove, a pressing plate (19) is connected to the inner sides of the first clamping block (24), a first sliding rod (12) is fixedly connected to the front end face of the third clamping block (44), the fourth clamping block (45) and the right end face of the first clamping block (24), a first sliding sleeve (13) is connected to the first sliding rod (12) in a sliding mode, a groove plate (2) is fixedly connected to the rear end face of the upper end face of the bottom plate (1), an L-shaped plate (3) is fixedly connected to the inner side of the groove plate (2) in a sliding mode, an L-shaped plate (3) is connected to the inner side of the L-shaped plate (3) and is connected to an electric telescopic rod (5) which is connected to the electric telescopic rod (5) through a threaded block sliding, a piston mounting plate (6), a second clamping plate (6) is fixedly connected to the rear end face of the mounting plate (6), a second clamping block (8) is fixedly connected to the left end face of the motor, and a cutting plate (8) is fixedly connected to the lower end face of the motor, and a cutting blade (8) is connected to the lower end plate (8), the middle part of the right side of the upper end surface of the bottom plate (1) is fixedly connected with a dust collection box (35).

2. A rubber product cutting apparatus as claimed in claim 1, wherein: one end of the first sliding sleeve (13) far away from the first sliding rod (12) is fixedly connected with the first clamping block (24) and the second clamping block (26), the right side of the front end face of the second clamping block (26) is rotatably connected with a first connecting rod (27) through a pin shaft, the right end of the first connecting rod (27) is rotatably connected with a second connecting rod (28) through a pin shaft, and the right end of the second connecting rod (28) is rotatably connected with a moving plate (31) through a pin shaft.

3. A rubber product cutting apparatus as claimed in claim 2, wherein: the utility model discloses a portable electric tool, including movable plate (31), movable plate (31) upper end is rotated and is connected with second worm (29), second worm (29) are connected with through second worm wheel (30) and round pin axle meshing second connecting rod (28), movable plate (31) up end front side middle part is rotated through the round pin axle and is connected with third connecting rod (32), third connecting rod (32) front end is rotated through the round pin axle and is connected with fourth connecting rod (33), fourth connecting rod (33) front end is rotated through the round pin axle and is connected with bottom plate (1), fourth connecting rod (33) front end is connected with third worm (34) through round pin axle and third worm wheel (46) meshing, third worm (34) front end is rotated and is connected with bottom plate (1).

4. A rubber product cutting device as claimed in claim 1, wherein: the improved gear rack is characterized in that a connecting plate (25) is fixedly connected to the upper end face of a pressing plate (19) at the left end, the right end of the pressing plate and the right end of the pressing plate (19) at the left end and the right end of the front side, a rack (18) is fixedly connected to the upper end face of the pressing plate at the rear end of the left side and a rack (18) are fixedly connected to the upper end face of the pressing plate at the rear end of the left side, the front end face of the rack (18), the right end face of the front end connecting plate (25) and the front end face of the rear end connecting plate (25) of the right side are fixedly connected to a second sliding rod (14), the second sliding rod (14) is slidably connected to a second sliding sleeve (15), the second sliding sleeve (15) is far away from the equal fixedly connected to the connecting plate (25) at one end of the second sliding rod (14), the rack (18) is meshed with a gear (20), the gear (20) is rotatably connected with a folding plate (21) through a pin shaft, the folding plate (21) is rotatably connected to the first worm (23), and is meshed with a first worm wheel (22) through a pin shaft and a first worm wheel (20).

5. A rubber product cutting apparatus as claimed in claim 1, wherein: recess board (2) left end face fixedly connected with third motor (16), third motor (16) output has through first threaded rod (17) threaded connection L template (3), the first motor of end face fixedly connected with (4) before L template (3), first motor (4) output end fixedly connected with second threaded rod (41), second threaded rod (41) threaded connection have electric telescopic handle (5).

6. A rubber product cutting device as claimed in claim 1, wherein: mounting panel (6) right-hand member intercommunication has hose (7), hose (7) right-hand member has through air exhauster (43) intercommunication dust collection box (35), dust collection box (35) inner chamber wall rear end face has sprocket (39) through round pin hub rotation connection, sprocket (39) meshing is connected with chain (38), chain (38) front end downside middle part is connected with scraper blade (37) through round pin hub rotation, scraper blade (37) upper end middle part sliding connection has third sliding sleeve (36), third sliding sleeve (36) upper end has through spout sliding connection dust collection box (35).

7. The rubber product cutting apparatus as claimed in claim 6, wherein: the upper end of the left side of the rear end face of the dust collection box (35) is fixedly connected with a fourth motor (42), the output end of the fourth motor (42) is fixedly connected with the chain wheel (39) through a pin shaft, and the lower side of the right end of the dust collection box (35) is connected with a collection box (40) in a sliding mode.

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