CN113696250B

CN113696250B - Large plastic cutting machine in aspect of plastic machinery

Info

Publication number: CN113696250B
Application number: CN202111009076.7A
Authority: CN
Inventors: 张文德; 欧阳军
Original assignee: Anhui Kaifeng Intelligent Equipment Co ltd
Current assignee: Anhui Kaifeng Intelligent Equipment Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-12-06
Anticipated expiration: 2041-08-31
Also published as: CN113696250A

Abstract

The invention discloses a large plastic cutting machine in the aspect of plastic machinery, which belongs to the technical field of plastic cutting and comprises a support, wherein a sleeve is fixedly arranged on the support, an intermittent feeding mechanism is arranged on the sleeve, a cutting mechanism matched with the intermittent feeding mechanism is arranged on the support, and a side plate is fixedly connected to one side of the support. The cylinder will be the reciprocating push-and-pull motion of circulation, thereby the first rotation piece of cooperation can drive the connecting plate with the use that the second rotated the piece and be the reciprocating rotation of circulation, thereby the use of cooperation side lever and second horizontal pole, can drive two sets of baffles and be the reciprocating rotation of circulation, and then the use of cooperation guide slot and guide arm can drive and correspond the slide and do upper and lower reciprocating motion, thereby it is reciprocating alternate movement about driving to correspond the baffle to do, and then can wait that the plastics pipeline that the cutting was waited to the multiunit separates at equidistant, thereby the purpose of intermittent type nature branch material has been realized, and then the development of the follow-up cutting operation of being convenient for.

Description

Large plastic cutting machine in aspect of plastic machinery

Technical Field

The invention relates to the technical field of plastic cutting, in particular to a large plastic cutting machine in the aspect of plastic machinery.

Background

Plastic tubing is a generic term for pipes made of plastic materials. The plastic pipeline has the characteristics of light dead weight, sanitation, safety, small water flow resistance, improvement of living environment, long service life, safety, convenience and the like, and is favored by the pipeline engineering industry.

Large-scale plastic conduit need cut the irregular face at its both ends when production processing, but the cutting machine that uses of current plastic conduit processing still has certain not enough, and traditional large-scale plastic cutting machine needs the manual work to carry out intermittent type pay-off and can't realize the cutting operation and get the synchronous development of material operation when using to reduced production efficiency, in addition, traditional large-scale plastic cutting machine can't ensure the planarization of cutting plane when carrying out the cutting operation, thereby reduced production technology.

Disclosure of Invention

In order to solve the technical problems, the invention adopts the following technical scheme: the invention provides a large-scale plastic cutting machine in the aspect of plastic machinery, which comprises a support, wherein a sleeve is fixedly installed on the support, an intermittent feeding mechanism is arranged on the sleeve, a cutting mechanism matched with the intermittent feeding mechanism is arranged on the support, a side plate is fixedly connected to one side of the support, a driving mechanism matched with the cutting mechanism and the intermittent feeding mechanism is arranged on the side plate, a feeding plate is fixedly installed at one end of the support, one end of the feeding plate is communicated with the sleeve, and an intermittent material distributing mechanism matched with the intermittent feeding mechanism is arranged on the feeding plate.

Preferably, intermittent type feeding mechanism includes first bull stick and heterotypic board, first bull stick rotates to be inserted and establishes on the sleeve, and the fixed feed roll that has cup jointed in the outside of first bull stick, set up the silo that connects of array distribution on the feed roll, the inboard that connects the silo is equipped with array distribution's vacuum chuck, the one end of first bull stick runs through the sleeve and has cup jointed the heterotypic dish at its terminal fixed cover, set up array distribution's spacing groove and drive groove on the heterotypic dish, and spacing groove and drive groove are the staggered distribution, heterotypic board fixed mounting is on the sleeve, and the upper end rotation of heterotypic board inserts and is equipped with the second bull stick, the one end that the second bull stick is close to the heterotypic dish is equipped with the carousel, telescopic one side fixed mounting is kept away from to the carousel has the spacing ring, and the carousel outer wall keeps away from the spacing ring one side and is equipped with the side piece, the side piece is kept away from the sleeve is equipped with the actuating lever to the side piece, the outer wall of spacing ring can contact with the inner wall of spacing groove, and the actuating lever can the activity card establish in the drive inslot.

Preferably, cutting mechanism includes third bull stick and push ring, the third bull stick rotates and inserts the lower extreme of establishing at the abnormal shape board, and the third bull stick is close to telescopic one end fixedly connected with rotor, the one end of rotor is equipped with the push rod, the push ring slip card is established on the support that is close to abnormal shape board one side, the push rod activity card is established in the push ring, and the push ring keeps away from the U type piece that one side fixedly connected with symmetry of third bull stick set up, fixed mounting has first horizontal pole on the U type piece, the one end and the support sliding connection of push ring are kept away from to first horizontal pole, and fixed cover has two sets of U type framves on the first horizontal pole, the inboard upper end fixed mounting of U type frame has the heating wire.

Preferably, actuating mechanism includes the pillar, pillar fixed mounting is on the curb plate, and the upper end fixed mounting of pillar has the motor, the output fixedly connected with action wheel of motor, one side and the third bull stick fixed connection of action wheel, telescopic one end fixedly connected with is kept away from the driving wheel to the second bull stick, be equipped with the belt from the outside transmission of driving wheel and action wheel.

Preferably, intermittent type feed mechanism includes first U template and second U template, and the equal fixed mounting of first U template and second U template is on the feed plate, rotate on the first U template and install first rotation piece, the one end of first rotation piece is equipped with the cylinder, the output end fixedly connected with second rotation piece of cylinder, one side that first U template is close to the second U template is equipped with the side lever of symmetric distribution, the inboard rotation of one end that first U template was kept away from to the side lever installs the second horizontal pole, the fixed baffle that has the symmetry to set up that cup joints on the second horizontal pole, the upper end of baffle is equipped with the connecting plate, the one end and the connecting plate fixed connection of second rotation piece, the guide slot that the symmetry set up is seted up at the both ends of baffle, run through on the second U template and set up the spout of symmetric distribution, it is equipped with the slide to slide the interior side upper end fixed mounting of slide has the guide arm, the guide arm activity card is established in the guide slot, and is adjacent the bottom fixedly connected with baffle of slide.

Preferably, one side upper end fixed mounting of support has the hopper that connects, the one end that connects the hopper is linked together with the sleeve, and connects the hopper to keep away from telescopic one end and run through the silo of getting of seting up the symmetry setting.

Preferably, the bottom end of the sleeve is provided with a through groove in a penetrating manner, the through groove is matched with the U-shaped frame and the heating wire, and the U-shaped frame and the heating wire are movably clamped in the through groove.

Preferably, the side of the push ring close to the sleeve is provided with symmetrically arranged T-shaped blocks, the support close to one side of the push ring is provided with a T-shaped groove, and the T-shaped blocks are slidably clamped in the T-shaped grooves.

The invention can separate a plurality of groups of plastic pipelines to be cut at equal intervals, thereby realizing the purpose of intermittent material distribution and facilitating the development of subsequent cutting operation. The synchronous development of the material receiving operation, the cutting operation and the material taking operation of the plastic pipeline to be cut can be realized, and the production efficiency is effectively improved. The plastic pipeline cutting device has the advantages that the two ends of the plastic pipeline to be cut can be quickly cut, the cutting surfaces can be ensured to be smoother, and the production process is effectively improved.

Drawings

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

Fig. 1 is a schematic structural diagram of a large plastic cutting machine in a plastic machine aspect according to an embodiment of the present invention.

FIG. 2 is a schematic bottom view of the present invention.

FIG. 3 is a schematic view of the connection structure of the present invention.

FIG. 4 is an enlarged view of the structure A in FIG. 3 according to the present invention.

FIG. 5 is an enlarged view of the structure at B in FIG. 3 according to the present invention.

FIG. 6 is an enlarged view of the structure at C in FIG. 3 according to the present invention.

FIG. 7 is a schematic view of the connection structure of the feeding plate and the intermittent distributing mechanism in the present invention.

FIG. 8 is an enlarged view of the structure shown at D in FIG. 7 according to the present invention.

Description of reference numerals: 1. a support; 11. a side plate; 12. a T-shaped groove; 2. a sleeve; 21. a through groove; 3. an intermittent feeding mechanism; 31. a first rotating lever; 32. a profiled plate; 33. a feed roller; 34. a material receiving groove; 35. a vacuum chuck; 36. a special-shaped disc; 37. a limiting groove; 38. a drive slot; 39. a second rotating rod; 310. a turntable; 311. a limiting ring; 312. a side block; 313. a drive rod; 4. a cutting mechanism; 41. a third rotating rod; 42. a push ring; 43. rotating the plate; 44. a push rod; 45. a U-shaped block; 46. a first cross bar; 47. a U-shaped frame; 48. an electric heating wire; 49. a T-shaped block; 5. a drive mechanism; 51. a pillar; 52. a motor; 53. a driving wheel; 54. a driven wheel; 55. a belt; 6. a feeding plate; 7. an intermittent material distributing mechanism; 71. a first U-shaped plate; 72. a second U-shaped plate; 73. a first rotating member; 74. a cylinder; 75. a second rotating member; 76. a side lever; 77. a second cross bar; 78. a guide plate; 79. a connecting plate; 710. a guide groove; 711. a chute; 712. a slide plate; 713. a guide bar; 714. a partition plate; 8. a receiving hopper; 81. and a material taking groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): as shown in fig. 1 to 8, the invention provides a large plastic cutting machine in the aspect of plastic machinery, which comprises a support 1, wherein a sleeve 2 is fixedly installed on the support 1, an intermittent feeding mechanism 3 is arranged on the sleeve 2, a cutting mechanism 4 matched with the intermittent feeding mechanism 3 is arranged on the support 1, a side plate 11 is fixedly connected to one side of the support 1, a driving mechanism 5 matched with the cutting mechanism 4 and the intermittent feeding mechanism 3 is arranged on the side plate 11, a feeding plate 6 is fixedly installed at one end of the support 1, one end of the feeding plate 6 is communicated with the sleeve 2, an intermittent material distributing mechanism 7 matched with the intermittent feeding mechanism 3 is arranged on the feeding plate 6, a receiving hopper 8 is fixedly installed at the upper end of one side of the support 1, one end of the receiving hopper 8 is communicated with the sleeve 2, a symmetrically-arranged material taking groove 81 penetrates through one end of the receiving hopper 8, which is far away from the sleeve 2, and the material taking groove 81 is used to provide convenience for taking a cut plastic pipeline.

The intermittent feeding mechanism 3 comprises a first rotating rod 31 and a special-shaped plate 32, the first rotating rod 31 is rotatably inserted on the sleeve 2, a feeding roller 33 is fixedly sleeved on the outer side of the first rotating rod 31, material receiving grooves 34 distributed in an array are formed in the feeding roller 33, vacuum suckers 35 distributed in an array are arranged on the inner side of the material receiving grooves 34, a vacuum generator matched with the vacuum suckers 35 for use is arranged inside the feeding roller 33, so that a plastic pipeline to be cut can be sucked through the vacuum suckers 35, the prior art is provided, the special-shaped plate 32 is fixedly installed on the sleeve 2, a second rotating rod 39 is rotatably inserted at the upper end of the special-shaped plate 32, a turntable 310 is arranged at one end, close to the special-shaped plate 36, of the limiting grooves 37 and driving grooves 38 distributed in an array, the limiting grooves 37 and the driving grooves 38 are distributed in an interlaced manner, the special-shaped plate 32 is fixedly installed on the sleeve 2, a second rotating rod 39 is rotatably inserted at the upper end of the special-shaped plate 32, a rotating rod 39 is provided with a turntable 310, a side block 311 is fixedly installed at one side, which is far away from the limiting ring 311, and a side block 311 is arranged at one side of the outer wall of the driving rod 310, which is far away from the sleeve 2, and a driving block 311 is capable of which is capable of contacting with the limiting block 311 is arranged in the driving block 311.

The cutting mechanism 4 comprises a third rotating rod 41 and a push ring 42, the third rotating rod 41 is rotatably inserted at the lower end of the special-shaped plate 32, a rotating plate 43 is fixedly connected to one end, close to the sleeve 2, of the third rotating rod 41, a push rod 44 is arranged at one end of the rotating plate 43, the push ring 42 is slidably clamped on the support 1 close to one side of the special-shaped plate 32, symmetrically arranged T-shaped blocks 49 are arranged at one side, close to the sleeve 2, of the push ring 42, a T-shaped groove 12 is formed in the support 1 close to one side of the push ring 42, the T-shaped blocks 49 are slidably clamped in the T-shaped grooves 12, and the T-shaped blocks 49 are matched with the T-shaped grooves 12 for use, so that the limiting and guiding effects are achieved on the movement adjustment of the push ring 42;

the push rod 44 is movably clamped in the push ring 42, one side of the push ring 42, which is far away from the third rotating rod 41, is fixedly connected with symmetrically arranged U-shaped blocks 45, a first cross rod 46 is fixedly installed on each U-shaped block 45, one end, which is far away from the push ring 42, of each first cross rod 46 is in sliding connection with the support 1, two groups of U-shaped frames 47 are fixedly sleeved on the first cross rods 46, heating wires 48 are fixedly installed at the upper ends of the inner sides of the U-shaped frames 47, heaters matched with the heating wires 48 are arranged on the support 1, so that the heating wires 48 can be continuously heated, through grooves 21 matched with the U-shaped frames 47 and the heating wires 48 are formed in the bottom end of the sleeve 2, the U-shaped frames 47 and the heating wires 48 are movably clamped in the through grooves 21, and the normal cutting operation is guaranteed due to the arrangement and use of the through grooves 21.

The driving mechanism 5 comprises a supporting column 51, the supporting column 51 is fixedly installed on the side plate 11, and the upper end of the supporting column 51 is fixedly installed with a motor 52, in the scheme: the type Y80M1-2 is preferably selected for the motor 52, a power supply interface of the motor is connected with a power supply system through a switch, an operation circuit of the motor 52 is a forward and reverse rotation control program of a conventional motor 52, the circuit operates as a conventional circuit, circuits and control related to the scheme are the prior art, and redundant description is not repeated herein, an output end of the motor 52 is fixedly connected with a driving wheel 53, one side of the driving wheel 53 is fixedly connected with a third rotating rod 41, one end, far away from the sleeve 2, of a second rotating rod 39 is fixedly connected with a driven wheel 54, and a belt 55 is arranged on the driven wheel 54 in transmission with the outer side of the driving wheel 53.

The intermittent material distribution mechanism 7 comprises a first U-shaped plate 71 and a second U-shaped plate 72, wherein the first U-shaped plate 71 and the second U-shaped plate 72 are fixedly installed on the feeding plate 6, a first rotating piece 73 is installed on the first U-shaped plate 71 in a rotating mode, an air cylinder 74 is arranged at one end of the first rotating piece 73, a second rotating piece 75 is fixedly connected to the output end of the air cylinder 74, side rods 76 which are symmetrically distributed are arranged on one side, close to the second U-shaped plate 72, of the first U-shaped plate 71, a second cross rod 77 is installed on the inner side, far away from the first U-shaped plate 71, of the side rods 76 in a rotating mode, guide plates 78 which are symmetrically arranged are fixedly sleeved on the second cross rod 77, a connecting plate 79 is arranged at the upper end of each guide plate 78, one end of each second rotating piece 75 is fixedly connected with the connecting plate 79, guide grooves 710 which are symmetrically arranged are formed in two ends of each guide plate 78, sliding grooves 711 which are symmetrically distributed are formed in a penetrating mode are provided with symmetrically, sliding plates 712 which are inserted in each sliding groove 711, guide plates 713 are fixedly arranged at the upper ends of the adjacent sliding plates 712, guide plates 713 are movably clamped in the guide grooves 710, and the bottom ends of the adjacent sliding plates 712 are fixedly connected with partition plates 714.

When the plastic pipe cutting machine is used, a user can open the air cylinder 74, the motor 52, the vacuum generator and the heater, convey a plastic pipe to be cut to the feeding plate 6 through an external conveying mechanism, then the plastic pipe to be cut rolls to one side of the sleeve 2 along the feeding plate 6, at the moment, the air cylinder 74 performs reciprocating push-pull motion, so that the first rotating piece 73 and the second rotating piece 75 are matched to drive the connecting plate 79 to perform reciprocating rotation, the side rods 76 and the second cross rods 77 are matched to drive the two groups of guide plates 78 to perform reciprocating rotation, and the guide grooves 710 and the guide rods 713 are matched to drive the corresponding sliding plates 712 to perform reciprocating movement up and down, so that the corresponding partition plates 714 are driven to perform reciprocating alternate movement up and down, and a plurality of groups of plastic pipes to be cut can be equally spaced, so that the purpose of intermittent material distribution is realized, and the subsequent cutting operation can be conveniently performed;

then the plastic pipeline to be cut is guided into the sleeve 2 through the feeding plate 6, the plastic pipeline to be cut is clamped in the corresponding material receiving groove 34 and is adsorbed and fixed by the vacuum chuck 35, meanwhile, the motor 52 drives the driving wheel 53 to rotate, so that the driven wheel 54 is driven to rotate through the belt 55, the turntable 310 is driven to rotate through the second rotating rod 39, the limiting ring 311 and the side block 312 synchronously rotate along with the limiting ring and the side block 312, the driving rod 313 synchronously rotates along with the side block 312, the limiting groove 37 and the driving groove 38 are matched in use, the first rotating rod 31 can be driven to intermittently rotate through the special-shaped disc 36, the plastic pipeline to be cut is driven to intermittently rotate through the feeding roller 33, the material receiving operation, the cutting operation and the material taking operation of the plastic pipeline to be cut can be synchronously carried out, and the production efficiency is effectively improved;

in addition, action wheel 53 will drive the commentaries on classics board 43 through third bull stick 41 and rotate, thereby drive push rod 44 and rotate, and the use of cooperation throw-out collar 42 can drive U type piece 45 and do upper and lower circulation reciprocating motion, thereby drive U type frame 47 through first horizontal pole 46 and do upper and lower circulation reciprocating motion, and then drive heating wire 48 and do upper and lower circulation reciprocating motion, thereby can cut the both ends quick cutting of waiting to cut plastic conduit, and can ensure that the cutting plane is more level and more smooth, and then effectively improved production technology, the plastic conduit after the cutting will be leading-in later to connect hopper 8, the user takes it off at last can.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The utility model provides a large-scale plastics cutting machine in plastics machinery aspect, includes support (1), its characterized in that: the automatic feeding device is characterized in that a sleeve (2) is fixedly mounted on the support (1), an intermittent feeding mechanism (3) is arranged on the sleeve (2), a cutting mechanism (4) matched with the intermittent feeding mechanism (3) is arranged on the support (1), a side plate (11) is fixedly connected to one side of the support (1), a driving mechanism (5) matched with the cutting mechanism (4) and the intermittent feeding mechanism (3) is arranged on the side plate (11), a feeding plate (6) is fixedly mounted at one end of the support (1), one end of the feeding plate (6) is communicated with the sleeve (2), and an intermittent distributing mechanism (7) matched with the intermittent feeding mechanism (3) is arranged on the feeding plate (6);

the intermittent feeding mechanism (3) comprises a first rotating rod (31) and a special-shaped plate (32), the first rotating rod (31) is rotatably inserted into the sleeve (2), a feeding roller (33) is fixedly sleeved on the outer side of the first rotating rod (31), material receiving grooves (34) distributed in an array are formed in the feeding roller (33), vacuum suction cups (35) distributed in an array are arranged on the inner side of the material receiving grooves (34), one end of the first rotating rod (31) penetrates through the sleeve (2) and is fixedly sleeved at the tail end of the sleeve (2) to form a special-shaped plate (36), limiting grooves (37) and driving grooves (38) distributed in an array are formed in the special-shaped plate (36), the limiting grooves (37) and the driving grooves (38) are distributed in an staggered manner, the special-shaped plate (32) is fixedly installed on the sleeve (2), a second rotating rod (39) is rotatably inserted into the upper end of the special-shaped plate (32), one end, close to the special-shaped plate (36), of the limiting ring (310), is provided with a rotating ring (313), one side wall (311) of the limiting ring (311) is provided with a limiting block (311) which is far away from the outer wall (311), and a side wall (311) of the limiting ring (311) is provided with a driving block (311) which is contacted with the limiting block (311), the driving rod (313) can be movably clamped in the driving groove (38);

the cutting mechanism (4) comprises a third rotating rod (41) and a push ring (42), the third rotating rod (41) is rotatably inserted into the lower end of the special-shaped plate (32), one end, close to the sleeve (2), of the third rotating rod (41) is fixedly connected with a rotating plate (43), one end of the rotating plate (43) is provided with a push rod (44), the push ring (42) is slidably clamped on the support (1) close to one side of the special-shaped plate (32), the push rod (44) is movably clamped in the push ring (42), one side, far away from the third rotating rod (41), of the push ring (42) is fixedly connected with symmetrically arranged U-shaped blocks (45), a first cross rod (46) is fixedly installed on the U-shaped blocks (45), one end, far away from the push ring (42), of the first cross rod (46) is slidably connected with the support (1), two groups of U-shaped frames (47) are fixedly sleeved on the first cross rod (46), and heating wires (48) are fixedly installed at the upper end of the inner side of the U-shaped frames (47);

the driving mechanism (5) comprises a supporting column (51), the supporting column (51) is fixedly installed on the side plate (11), a motor (52) is fixedly installed at the upper end of the supporting column (51), the output end of the motor (52) is fixedly connected with a driving wheel (53), one side of the driving wheel (53) is fixedly connected with a third rotating rod (41), one end, far away from the sleeve (2), of the second rotating rod (39) is fixedly connected with a driven wheel (54), and a belt (55) is arranged on the outer side of the driven wheel (54) and the driving wheel (53) in a transmission mode;

the intermittent distributing mechanism (7) comprises a first U-shaped plate (71) and a second U-shaped plate (72), the first U-shaped plate (71) and the second U-shaped plate (72) are fixedly mounted on the feeding plate (6), a first rotating member (73) is rotatably mounted on the first U-shaped plate (71), an air cylinder (74) is arranged at one end of the first rotating member (73), a second rotating member (75) is fixedly connected to an output end of the air cylinder (74), a side rod (76) which is symmetrically distributed is arranged on one side, close to the second U-shaped plate (72), of the first U-shaped plate (71), a second cross rod (77) is rotatably mounted on the inner side of one end, far away from the first U-shaped plate (71), of the side rod (76), a guide plate (78) which is symmetrically arranged is fixedly connected to the second cross rod (77), a connecting plate (79) is arranged on the upper end of the guide plate (78), one end of the second rotating member (75) is fixedly connected to the connecting plate (79), guide grooves (710) which are symmetrically arranged are arranged at two ends of the guide plate (78), a sliding plate (72) is provided with a sliding plate (711), and a sliding plate (711) is inserted into a sliding groove (711) which is arranged on the inner side of the sliding plate (711), the bottom end of the adjacent sliding plate (712) is fixedly connected with a clapboard (714).

2. The large plastic cutting machine in the aspect of plastic machinery according to claim 1, characterized in that a receiving hopper (8) is fixedly installed at the upper end of one side of the support (1), one end of the receiving hopper (8) is communicated with the sleeve (2), and the ends of the receiving hopper (8) far away from the sleeve (2) are provided with symmetrically arranged material taking grooves (81) in a penetrating manner.

3. The large plastic cutting machine for plastic machinery according to claim 1, characterized in that the bottom end of the sleeve (2) is provided with a through groove (21) for matching with the U-shaped frame (47) and the heating wire (48), and the U-shaped frame (47) and the heating wire (48) are movably clamped in the through groove (21).

4. A large-scale plastic cutting machine in plastic machinery according to claim 1, characterized in that the side of the push ring (42) near the sleeve (2) is provided with symmetrically arranged T-shaped blocks (49), the support (1) near the side of the push ring (42) is provided with a T-shaped groove (12), and the T-shaped blocks (49) are slidably clamped in the T-shaped groove (12).