CN210817731U

CN210817731U - Metal band sawing machine with clamping device

Info

Publication number: CN210817731U
Application number: CN201921869804.XU
Authority: CN
Inventors: 刘珍传; 江梅世; 于贻诚; 宋和君; 宋小花
Original assignee: Qingdao Jiyeju Casting & Forging Co Ltd
Current assignee: Qingdao Jiyeju Casting & Forging Co Ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-06-23
Anticipated expiration: 2029-11-01

Abstract

The utility model discloses a metal band sawing machine with a clamping device, belonging to the technical field of metal band sawing machine clamping, the technical proposal comprises a frame which is horizontally arranged, a saw frame is vertically arranged on the upper side of the frame, a lifting cylinder which can drive the saw frame to fall is fixedly connected on the frame, a saw blade is fixedly connected with the middle part of the saw frame, a feeding platform is horizontally and fixedly connected with one side of the machine frame corresponding to the saw frame, one side of the feeding platform corresponding to the saw blade is connected with two direction clamping blocks tending to approach each other in a sliding way, one side of each of the two clamping blocks which is close to each other is horizontally provided with a clamping groove which can respectively penetrate through the two side walls of the clamping block, one side of each of the two clamping grooves which is close to each other is respectively provided with a containing groove, a movable block is respectively and vertically arranged in each of the two containing grooves, one side of each clamping block, which is far away from each other, is respectively in threaded connection with an adjusting screw rod capable of pushing the movable blocks to slide in the direction of approaching each other. The utility model discloses an effect that can centre gripping panel and rod simultaneously.

Description

Metal band sawing machine with clamping device

Technical Field

The utility model belongs to the technical field of the technique of strap sawing machine centre gripping and specifically relates to a strap sawing machine with clamping device is related to.

Background

The metal band sawing machine is mainly used for sawing various metal materials such as low alloy steel, high alloy steel, special alloy steel, stainless steel and the like, and has the advantages of small energy consumption and less material waste due to narrow band saw cuts and high cutting efficiency, so that the metal band sawing machine is efficient cutting equipment with remarkable energy-saving and material-saving effects.

The prior Chinese utility model patent with the reference patent application number of CN208879824U discloses an adjustable feeding mechanism of a metal band sawing machine, which comprises a workbench, wherein two sides of the workbench are respectively fixed with a support plate, the support plate is provided with an internal thread hole, the support plate is fixed with an adjusting screw, one end of the adjusting screw is connected with a first clamping plate through a gap, the horizontal central line of the first clamping plate and the horizontal central line of the adjusting screw coincide with each other, one end of the first clamping plate is provided with a rubber pad, and the rear end surface of the workbench is fixed with a support plate; above-mentioned utility model through the setting of backup pad, fix the mediation nut, make first cardboard carry out the fixed action to the material, through the setting of rubber pad, increase the contact friction force between first cardboard and material to avoid fixed shakiness, through the setting of second cardboard, can adjust the pay-off process of material through adjusting screw's rotation, guarantee that the material terminal surface is in on same horizontal plane, avoid appearing the skew in the fixed process.

However, the above prior art solutions have the following drawbacks: the clamping device of most metal band sawing machines is usually a plane plate, so when clamping a bar, the bar is easy to loosen, so that the clamping effect is poor, and the cut section cut by sawing is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a metal band sawing machine with clamping device reaches the beneficial effect that can centre gripping panel and rod simultaneously.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a strap sawing machine with clamping device, includes the frame that the level set up, the one end of frame is provided with the sash, the one side level that the frame corresponds the sash is provided with the material loading platform, material loading bench side is provided with the slide, the slide corresponds sash one side and slides along the length direction of sash and is connected with two grip blocks that can tend to the direction that is close to each other and slide, two the centre gripping groove of V-arrangement, two are seted up respectively to the one side that the grip block is close to each other the centre gripping groove arc mouth is relative, two the holding tank has been seted up respectively to the one side that the grip block is close to each other, two slide along the direction of sliding of grip block in the holding tank respectively and be connected with the movable block, one side that the movable block is. Still all be provided with the pushing mechanism that can promote the movable block protrusion in the centre gripping groove in the centre gripping piece.

By adopting the technical scheme: the pushing mechanism can push the two movable blocks to slide in the direction of approaching each other until the two movable blocks slide out of the accommodating groove respectively, one sides of the two movable blocks, which are close to each other, can be located on the same vertical surface with the corresponding clamping groove notches respectively, and the bar is placed between the two movable blocks, so that one sides of the two movable blocks, which are close to each other, in the clamping blocks can be tightly abutted to one sides of the plates, which are far away from each other, respectively, so that the plates are clamped; when the bar is clamped, the movable block does not need to be adjusted, the bar is directly placed between the two clamping blocks, and one side, close to each other, of the two clamping grooves can be respectively and tightly abutted against one side, far away from each other, of the bar, so that the bar is clamped; then the opening equipment, saw cut panel or rod when the saw blade slides down and become required dissection, can make grip block centre gripping rod or panel simultaneously through removing the movable block, the last lift cylinder can drive the sash decline, makes the saw blade descend to saw cut the work piece.

The utility model discloses further set up to: the pushing mechanism comprises an adjusting screw rod which is horizontally connected to one side of the two clamping blocks away from each other in a threaded manner, and the adjusting screw rod can push the movable blocks to slide towards the direction of approaching each other.

Through adopting above-mentioned technical scheme, when the centre gripping rod, the orientation that tends to be close to each other earlier rotates two adjusting screw to can promote two movable blocks and tend the orientation that is close to each other and slide, slide out the holding tank respectively until two movable blocks.

The utility model discloses further set up to: two the one end that adjusting screw was close to each other all rotates to be connected in the one side that two movable blocks kept away from each other.

Through adopting above-mentioned technical scheme, rotate to connect and can improve the stability of movable block process of sliding.

The utility model discloses further set up to: the upper side of the sliding plate is in threaded connection with a wire aligning screw rod of which the axis direction is perpendicular to the length direction of the sliding plate at the position corresponding to the two clamping blocks, the lower ends of the two clamping blocks are in threaded connection with opposite thread sections at the two ends of the wire aligning screw rod respectively, and the sliding plate is provided with a transmission mechanism capable of driving the wire aligning screw rod to rotate.

Through adopting above-mentioned technical scheme, drive as drive mechanism and rotate along its axis direction to the silk screw rod to drive the direction motion that two grip blocks can tend to be close to each other, and then can accomplish the regulation of distance between two grip blocks, make two grip blocks can the centre gripping the round steel of different diameters.

The utility model discloses further set up to: the two sides of the lower surface of the sliding plate are fixedly connected with a limiting plate along the length direction of the sliding plate respectively, and the two sides of the feeding table can be abutted to one side, close to the two limiting plates, respectively.

Through adopting above-mentioned technical scheme, when the slide tended to be close to the direction of saw blade and slided along the length direction of material loading platform, two limiting plates can be spacing to the slide, prevent that the slide from taking place the skew of position at the in-process that slides.

The utility model discloses further set up to: the transmission mechanism comprises a worm wheel fixedly connected to one end, extending out of the sliding plate, of the paired screw rod, the position, corresponding to the worm wheel, of the limiting plate is fixedly connected with a transmission motor, and an output shaft of the transmission motor is fixedly connected with a worm meshed with the worm wheel.

Through adopting above-mentioned technical scheme, when drive motor drive worm rotated to can drive the worm wheel and rotate, and then can drive and rotate its axis direction to the screw rod, the worm wheel has auto-lock nature with the worm cooperation simultaneously, thereby can adjust the arbitrary distance between two grip blocks, thereby can be applicable to the centre gripping of different diameter round steel.

The utility model discloses further set up to: the slide downside still rotates and is connected with an axial direction and is on a parallel with the length direction's of sash gear, one side that the sash corresponds the gear still rigid coupling along the length direction of material loading platform has can mesh in the rack gear, one side that the slide corresponds the gear still rigid coupling has one can drive gear pivoted servo motor.

Through adopting above-mentioned technical scheme, when servo motor drive gear rotated, can drive the gear and rotate along the length direction of rack to can drive the direction that the slide tended to be close to the saw blade and slide.

The utility model discloses further set up to: a blanking table is horizontally and fixedly connected to the other side, corresponding to the saw frame, of the machine frame, and a baffle is vertically arranged on the upper side of the blanking table.

Through adopting above-mentioned technical scheme, the baffle can with the tip butt of the rod or the panel of waiting to saw cut to can guarantee that the length of the dissection of saw cutting out is the same.

The utility model discloses further set up to: the baffle tends to the direction of saw blade and slides and connect in unloading platform upside, the horizontal rigid coupling in one side that the saw blade was kept away from to the baffle has a location strip, vertical threaded connection has a positioning bolt on the location strip.

Through adopting above-mentioned technical scheme, when the dissection of different length is cut out to needs, earlier at unloading bench moving baffle, after the baffle moved to suitable position, rotate positioning bolt along vertical decurrent direction, the upside in unloading platform can be tightly pushed up to the lower extreme that makes positioning bolt to make the inseparable butt of locating strip downside and the upside of unloading platform, and then can be with the position fixation of baffle, and then can adjust the distance between completion baffle and the saw blade, the round steel length that needs saw cut promptly.

The utility model discloses further set up to: two sliding grooves are formed in the upper side of the blanking table in the length direction parallel to the rack, and sliding blocks which can be connected into the corresponding sliding grooves in a sliding mode are fixedly connected to the two ends of the lower side of the baffle plate corresponding to the two sliding grooves respectively.

Through adopting above-mentioned technical scheme, the spout can prevent with the slider cooperation that the baffle from sliding the skew that the in-process takes place the position.

To sum up, the utility model discloses a beneficial technological effect does:

1. by adopting the technical scheme: the pushing mechanism can push the two movable blocks to slide in the direction of approaching each other until the two movable blocks slide out of the accommodating groove respectively, one sides of the two movable blocks, which are close to each other, can be located on the same vertical surface with the corresponding clamping groove notches respectively, and the bar is placed between the two movable blocks, so that one sides of the two movable blocks, which are close to each other, in the clamping blocks can be tightly abutted to one sides of the plates, which are far away from each other, respectively, so that the plates are clamped; when the bar is clamped, the movable block does not need to be adjusted, the bar is directly placed between the two clamping blocks, and one side, close to each other, of the two clamping grooves can be respectively and tightly abutted against one side, far away from each other, of the bar, so that the bar is clamped; then starting the equipment, sawing the plate or the bar into required cutting sections when the saw blade slides downwards, enabling the clamping block to simultaneously clamp the bar or the plate by moving the movable block, and finally enabling the lifting cylinder to drive the saw frame to descend to enable the saw blade to descend so as to saw the workpiece;

2. by arranging the worm wheel and the worm, when the transmission motor drives the worm to rotate, the worm wheel can be driven to rotate, the pair screw rod can be driven to rotate along the axis direction of the pair screw rod, and meanwhile, the worm wheel and the worm are matched to have self-locking performance, so that any distance between the two clamping blocks can be adjusted, and the pair screw rod clamping device can be suitable for clamping round steel with different diameters;

3. through being provided with the baffle, can guarantee that the dissection length that cuts out is the same.

Drawings

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

fig. 2 is a schematic view of a rack structure in the present embodiment;

FIG. 3 is a schematic diagram of the movable block structure in the present embodiment;

FIG. 4 is an enlarged partial view of portion A of FIG. 1;

fig. 5 is a schematic view of a baffle structure in the embodiment.

In the figure, 1, a frame; 11. a lift cylinder; 2. a saw frame; 21. a saw blade; 22. a rack; 3. a feeding table; 31. a slide plate; 311. a limiting plate; 3111. a connecting frame; 3112. a drive motor; 3113. a gear; 312. a servo motor; 313. a groove; 32. a screw rod is aligned; 321. a worm gear; 322. a worm; 4. a blanking table; 41. a chute; 5. a clamping block; 51. a clamping groove; 52. accommodating grooves; 53. a movable block; 54. adjusting the screw rod; 6. a baffle plate; 61. a positioning bar; 62. positioning the bolt; 63. a slide block.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, a metal band sawing machine with a clamping device comprises a horizontally arranged frame 1, wherein the frame 1 is in a cuboid shape, a saw frame 2 is vertically arranged at one end of the upper side of the frame 1, the length direction of the saw frame 2 is perpendicular to the length direction of the frame 1, and lifting cylinders 11 capable of driving the saw frame 2 to lift are fixedly connected to two sides of the frame 1 corresponding to the saw frame 2. A saw blade 21 is fixedly connected to the middle of the saw frame 2, the saw blade 21 is parallel to the length direction of the saw frame 2, the teeth of the saw blade are arranged downwards, and driving mechanisms capable of driving the saw blade 21 to rotate are further arranged on two sides of the saw frame 2 (which is not described in detail herein for the prior art). A feeding table 3 is horizontally and fixedly connected to one side of the frame 1 corresponding to the saw frame 2, and the length direction of the feeding table 3 is parallel to the length direction of the frame 1. When the workpiece on the feeding table 3 is sawed, the lifting cylinder 11 can drive the saw frame 2 to descend, so that the saw blade 21 descends, and the workpiece is sawed.

Referring to fig. 2, one side of the feeding table 3 corresponding to the saw blade 21 is connected with a sliding plate 31 along the length direction thereof in a sliding manner, two sides of the lower surface of the sliding plate 31 are respectively and fixedly connected with a limiting plate 311 along the length direction thereof, and one side of the two limiting plates 311 close to each other can abut against two sides of the sliding plate 31, so that the sliding plate 31 can be prevented from shifting in the sliding process. The link 3111 that two limiting plates 311 downside still the rigid coupling has a level to set up, link 3111 is located slide 31 downside, and the length direction of link 3111 is perpendicular to the length direction of limiting plate 311, the middle part of link 3111 rotates and is connected with a gear 3113, the axis direction of gear 3113 is the same with the length direction of link 3111, the frame 1 corresponds the below of material loading platform 3 and still the rigid coupling has a length direction and the same rack 22 of material loading platform 3 length direction, rack 22 meshes in gear 3113, one side that link 3111 corresponds rack 21 still the rigid coupling has a servo motor 312, the output shaft and the gear 3113 pivot rigid coupling of servo motor 312. When the servo motor 312 drives the gear 3113 to rotate, the gear 3113 can be driven to move along the length direction of the rack 22, so that the slide plate 31 can be driven to slide in the direction approaching the saw blade 21.

The vertical two grip blocks 5 that are provided with of slide 31 upside, slide 31 upside still vertically has seted up a recess 313 corresponding to the position of two grip blocks 5, the length direction perpendicular to slide 31's of recess 313 length direction, recess 313 female connection has a pair of screw rod 32, the axis direction of screw rod 32 is on a parallel with the length direction of recess 313, the lower extreme difference threaded connection of two grip blocks 5 is in the opposite screw thread section at screw rod 32 both ends, slide 31 one side is provided with can drive screw rod 32 pivoted drive mechanism. When the threaded rod 32 rotates along the axis direction thereof, the two clamping blocks 5 are driven to move towards the direction close to each other, and the distance between the two clamping blocks 5 can be adjusted, so that the two clamping blocks 5 can clamp workpieces with different diameters.

Referring to fig. 4, the transmission mechanism includes a worm gear 321 fixedly connected to one end of the wire aligning screw rod 32 extending out of the sliding plate 31, the worm gear 321 and the wire aligning screw rod 32 are coaxially arranged, a transmission motor 3112 is fixedly connected to a position of the sliding plate 31 corresponding to the worm gear 321, and a worm 322 capable of engaging with the worm gear 321 is fixedly connected to an output shaft of the transmission motor 3112. When drive motor 3112 drive worm 322 rotates to can drive worm wheel 321 and rotate, and then can drive and rotate its axis direction to silk screw 32, worm wheel 321 has the auto-lock nature with the cooperation of worm 322 simultaneously, thereby can adjust arbitrary distance between two grip blocks 5, thereby can be applicable to the centre gripping of different diameter round steel.

Referring to fig. 3, a centre gripping groove 51 has been seted up respectively to one side that two grip blocks 5 are close to each other, two centre gripping grooves 51 are the V type and the notch sets up relatively, pushing mechanism includes horizontal threaded connection in the adjusting screw 54 of one side that two grip blocks 5 kept away from each other, two adjusting screw 54's axis direction all is the same with the axis direction to silk screw 32, an holding tank 52 has still been seted up to one side that two grip blocks 5 are close to each other respectively the level, it is connected with a movable block 53 to slide respectively along the axis direction to silk screw 32 in two holding tanks 52, the one end homoenergetic that two adjusting screw 54 are close to each other all can extend to in the holding tank 52 and rotate and connect in one side that movable block 53 kept away from each. When the two adjusting screws 54 are rotated in the directions approaching each other, the two movable blocks 53 can be pushed to move in the directions approaching each other until the two movable blocks 53 move out of the accommodating grooves 52 respectively, and the sides of the two movable blocks 53 approaching each other can be located on the same vertical plane with the outer sides of the notches of the corresponding clamping grooves 51 respectively, so that the plate can be clamped.

Referring to fig. 5, a blanking table 4 is further horizontally and fixedly connected to one side of the frame 1 corresponding to the saw frame 2, and the length direction of the blanking table 4 is parallel to the length direction of the frame 1. One side of the blanking table 4 is vertically provided with a baffle 6, the length direction of the baffle 6 is perpendicular to the length direction of the blanking table 4, the blanking table 4 is provided with two T-shaped sliding grooves 41 along the length direction, the positions of the lower side of the baffle 6 corresponding to the two sliding grooves 41 are respectively and fixedly connected with a T-shaped sliding block 63, the two sliding blocks 63 can be respectively connected in the corresponding sliding grooves 41 in a sliding way, one side of the baffle 6 far away from the saw frame 2 is horizontally and fixedly connected with a positioning strip 61, a positioning bolt 62 is vertically and threadedly connected to the positioning strip 61, after the baffle 6 is moved to a proper position, the positioning bolt 62 is rotated along the vertical downward direction, the lower end of the positioning bolt 62 can be tightly propped against the upper side of the blanking table 4, so that the lower side of the positioning strip 61 is tightly propped against the upper side of the blanking table 4, the position of the baffle 6 can be fixed, and, i.e. the length of round steel that needs to be sawn.

The implementation principle of the embodiment is as follows: when round steel is sawed, firstly, the positioning bolt 62 is rotated along the vertical downward direction according to the length of the cut section to be sawn, so that the lower end of the positioning bolt 62 can be tightly propped against the upper side of the blanking table 4, the lower side of the positioning strip 61 is tightly abutted against the upper side of the blanking table 4, the position of the baffle 6 can be fixed, and the adjustment of the distance between the baffle 6 and the saw blade 21, namely the length of the cut section to be sawn, can be completed; when clamping the bar, the two adjusting screws 54 are rotated in the direction approaching each other, the two movable blocks 53 are pushed to move in the direction approaching each other until the two movable blocks 53 slide out of the accommodating groove 52 respectively, and the side of the two movable blocks 53 approaching each other can be in the same vertical plane with the corresponding notch of the clamping groove 51 respectively, the bar is placed between the two movable blocks 53, then the transmission motor 3112 is started to drive the worm 322 to rotate, so that the worm wheel 321 is driven to rotate, the wire aligning screw 32 can be driven to rotate, the two clamping blocks 5 can be driven to move in the direction approaching each other, the side of the two movable blocks 53 in the clamping block 5 approaching each other can be tightly abutted to the side of the plate far away from each other, and the plate is clamped; when the bar is clamped, the movable block 53 does not need to be adjusted, the bar is directly placed between the two clamping blocks 5, and then the transmission motor 3112 is started to drive the worm 322 to rotate, so that the worm wheel 321 is driven to rotate, the wire screw 32 can be driven to rotate, the two clamping blocks 5 can be driven to move towards the directions close to each other, one sides close to each other of the two clamping grooves 51 can be respectively and tightly abutted against one sides far away from each other of the bar, and the bar is clamped; then when servo motor 312 drive gear 3113 rotated, can drive gear 3113 along the length direction rotation of rack 22 to can drive slide 31 and tend to the direction that is close to saw blade 21 and slide, when the tip that slides the rod that is held and baffle 6 were close to the butt of one side of saw blade 21, then lift cylinder 11 can drive sash 2 decline, makes saw blade 21 descend, thereby saw cut the rod into required dissection.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a strap sawing machine with clamping device, includes frame (1) that the level set up, the one end of frame (1) is provided with sash (2), its characterized in that: a feeding table (3) is horizontally arranged on one side of the frame (1) corresponding to the saw frame (2), the feeding table (3) is provided with a sliding plate (31) at the upper side, one side of the sliding plate (31) corresponding to the saw frame (2) is connected with two clamping blocks (5) which can slide along the direction approaching to each other along the length direction of the saw frame (2) in a sliding way, one side of the two clamping blocks (5) approaching to each other is respectively provided with a V-shaped clamping groove (51), the two clamping grooves (51) are opposite in arc mouth, one side of the two clamping blocks (5) approaching to each other is respectively provided with a containing groove (52), and the two containing grooves (52) are respectively connected with a movable block (53) along the sliding direction of the clamping blocks (5) in a sliding way, one side that movable block (53) are close to each other is vertical face, still all be provided with the pushing mechanism that can promote movable block (53) protrusion in centre gripping groove (51) in centre gripping piece (5).

2. The metal band sawing machine with the clamping device according to claim 1, characterized in that: the pushing mechanism comprises adjusting screw rods (54) which are horizontally connected to one sides of the two clamping blocks (5) far away from each other in a threaded mode, and the adjusting screw rods (54) can push the movable blocks (53) to slide in the direction of approaching each other.

3. The metal band sawing machine with the clamping device according to claim 2, characterized in that: one ends of the two adjusting screws (54) close to each other are rotatably connected to one sides of the two movable blocks (53) far away from each other.

4. The metal band sawing machine with the clamping device according to claim 3, characterized in that: the feeding table is characterized in that the upper side of the feeding table (3) is connected with a sliding plate (31) in a sliding mode along the length direction of the upper side of the feeding table, the position, corresponding to the two clamping blocks (5), of the upper side of the sliding plate (31) is further connected with a screw rod (32) which is opposite to the length direction of the sliding plate (31) in a threaded mode in the axial direction, the lower ends of the two clamping blocks (5) are respectively connected with opposite thread sections at the two ends of the screw rod (32) in a threaded mode, and a transmission mechanism capable of driving the screw rod (32) to rotate is arranged on.

5. The metal band sawing machine with the clamping device according to claim 4, characterized in that: the lower surface of the sliding plate (31) is fixedly connected with a limiting plate (311) along the length direction of the sliding plate, and the two sides of the feeding table (3) can abut against one side, close to the two limiting plates (311), of the two sides respectively.

6. The metal band sawing machine with the clamping device according to claim 5, characterized in that: drive mechanism includes worm wheel (321) that the rigid coupling extends slide (31) one end in to silk screw rod (32), the position rigid coupling that limiting plate (311) corresponds worm (322) has a drive machine (3112), drive machine (3112) output shaft rigid coupling has one and meshes worm (322) in worm wheel (321).

7. The metal band sawing machine with the clamping device according to claim 6, characterized in that: slide (31) downside still rotates and is connected with an axial direction and is on a parallel with gear (3113) of the length direction of sash (2), one side that sash (2) corresponds gear (3113) is still the rigid coupling along the length direction of material loading platform (3) and is had rack (23) that can mesh in gear (3113), one side that slide (31) corresponds gear (3113) is still the rigid coupling have one can drive gear (3113) pivoted servo motor (312).

8. The metal band sawing machine with clamping device according to claim 7, characterized in that: a blanking table (4) is horizontally and fixedly connected to the other side, corresponding to the saw frame (2), of the rack (1), and a baffle (6) is vertically arranged on the upper side of the blanking table (4).

9. The metal band sawing machine with clamping device according to claim 8, characterized in that: baffle (6) trend direction of saw blade (21) slide and connect in unloading platform (4) upside, baffle (6) keep away from the horizontal rigid coupling in one side of saw blade (21) and have a location strip (61), vertical threaded connection has a positioning bolt (62) on location strip (61).

10. The metal band sawing machine with clamping device according to claim 9, characterized in that: two sliding grooves (41) are formed in the upper side of the blanking table (4) along the length direction parallel to the rack (1), and sliding blocks (63) which can be connected into the corresponding sliding grooves (41) in a sliding mode are fixedly connected to the positions, corresponding to the two sliding grooves (41), of the two ends of the lower side of the baffle (6) respectively.