CN112207909A

CN112207909A - Even segmentation cutting equipment of log for building materials

Info

Publication number: CN112207909A
Application number: CN202011171132.2A
Authority: CN
Inventors: 何顺
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-01-12

Abstract

The invention relates to a sectional cutting device, in particular to a round log uniform sectional cutting device for building materials. The technical problem to be solved is as follows: the even segmentation cutting equipment for the building material logs is capable of automatically fixing, pushing and cutting the logs. The technical scheme of the invention is as follows: a log uniform sectional cutting device for building materials comprises a base and a cutting mechanism, wherein the base is connected with the cutting mechanism; the base is connected with the stock stop mechanism, and the cutting mechanism is positioned on the side of the stock stop mechanism; the base is connected with the pushing mechanism; the material pushing mechanism is connected with a material pushing mechanism. Through the cooperation between cutting mechanism, stock stop, pushing equipment and the liftout mechanism, can replace the people to cut the log, can realize automatic material, keep off the material and cut, whole journey need not people and inserts the hand, improves people's work efficiency, can realize moreover that the log specification that the cutting came out is unified.

Description

Even segmentation cutting equipment of log for building materials

Technical Field

The invention relates to a sectional cutting device, in particular to a round log uniform sectional cutting device for building materials.

Background

At present, most of the furniture is made of wood, so that the processing technology of wood is involved in the production process of the furniture. Wood processing refers to processing which is mainly carried out by mechanical or chemical methods by using wood as a raw material, and the product still maintains the basic characteristics of the wood. The wood processing technology mainly comprises wood cutting, wood drying, wood gluing, basic processing technology of wood surface decoration lamps and wood protection. The wood is cut into materials with different shapes such as cylinders, plates and strips, then the cut wood is further processed deeply, and when cylindrical wood is processed, in order to facilitate the processing and processing of the surface of the cylinder, round wood needs to be fixed and cut.

Patent application CN201710538280.5 log cutting device, including cutting wood device, cutting blade and fixing device, it includes the hollow cylinder mount pad to cut the wood device, the inner wall upper end array of hollow cylinder mount pad is equipped with four rectangle recesses, the cutting blade joint sets up in the rectangle recess of hollow cylinder mount pad, fixing device includes four fixed columns, be equipped with two rings of location rings on four fixed columns, four fixed column fixed welding are in the upper end of hollow cylinder mount pad.

After the round timber is fixed by the equipment, the round timber needs to be beaten by the hammer, so that the round timber cutting effect is realized, labor cost is high during operation, time and labor are wasted, and the function is single, so that the round timber uniformly-segmenting and cutting equipment for building materials, which can realize automatic fixation, material pushing and round timber cutting, is developed and researched.

Disclosure of Invention

In order to overcome the defects of single function and time and labor waste of the existing equipment, the technical problem to be solved is as follows: the even segmentation cutting equipment for the building material logs is capable of automatically fixing, pushing and cutting the logs.

The technical scheme of the invention is as follows: the utility model provides a log even segmentation cutting equipment for building materials, including:

the cutting device comprises a base and a cutting mechanism, wherein the base is connected with the cutting mechanism;

the base is connected with the stock stop mechanism, and the cutting mechanism is positioned on the side of the stock stop mechanism;

the base is connected with the pushing mechanism;

the material pushing mechanism is connected with a material pushing mechanism.

As a preferable technical solution of the present invention, the cutting mechanism includes:

one side of the base is connected with a first servo motor;

the output shaft of the first servo motor is connected with a first rotating shaft;

the base is connected with a bearing seat close to one side of the first rotating shaft, and the bearing seat is positioned on one side of the first servo motor;

the bearing seat is rotatably connected with the second rotating shaft;

the bevel gear set is connected between the second rotating shaft and the top of the first rotating shaft;

and one side of the second rotating shaft, which is far away from the bevel gear set, is connected with a cutter.

As a preferred technical scheme of the invention, the stock stop comprises:

the supporting columns are uniformly connected to one side, close to the first servo motor, of the base;

the supporting plates are connected between the tops of the supporting columns;

the supporting plate is uniformly provided with rectangular grooves, and the top of the supporting plate is connected with the baffle in a sliding manner;

the clamping block is inserted between the supporting plate and the rectangular groove;

the top of the clamping block is connected with a first fixing block.

As a preferred technical scheme of the invention, the material pushing mechanism comprises:

the left rear side of the base is connected with a second servo motor;

the output shaft of the second servo motor is connected with a third rotating shaft;

the top of the third rotating shaft is connected with a rotating rod;

the two sides of the top of the base are both connected with the rectangular sliding blocks in a sliding manner;

the movable plate is connected between the tops of the rectangular sliding blocks and connected with the material ejecting mechanism;

the two sides of the top of the base are both connected with second fixed blocks;

the first telescopic rods are connected between the second fixed block and the moving plate;

the first springs are connected between the moving plate and the second fixed block and sleeved outside the first telescopic rods;

the sliding sleeve is connected with one side of the movable plate and is connected with the rotating rod in a sliding mode.

As a preferred technical scheme of the invention, the ejection mechanism comprises:

the first fixed plate is connected to one side of the top of the moving plate;

two sides of the first fixing plate are both connected with second telescopic rods;

the push plate is connected between the second telescopic rods;

and the second springs are connected between the two sides of the first fixing plate and the two sides of the push plate and sleeved outside the second telescopic rods.

As a preferred technical solution of the present invention, the present invention further includes a fixing mechanism, the fixing mechanism includes:

the top of the moving plate is uniformly connected with a second fixed plate;

the push plate is connected with the first sliding block in a sliding manner;

the first sliding block is connected with a third telescopic rod;

the side, away from the first slide block, of the moving plate is connected with a second slide block in a sliding mode, and the top of the second slide block is connected with a third telescopic rod;

the second sliding block is connected with a fourth telescopic rod;

the bottom of the moving plate is connected with a third fixed block, and the third fixed block is connected with a fourth telescopic rod;

and a third spring is connected between the third fixing block and the second sliding block and sleeved outside the fourth telescopic rod.

As a preferred technical scheme of the present invention, the present invention further comprises a material shaking mechanism, wherein the material shaking mechanism comprises:

the top of the supporting plate is connected with a blanking plate;

the bottom of the second sliding block is connected with a mandril;

the collecting box, the base is close to flitch one side slidingtype and is connected with the collecting box, and the collecting box is connected with the ejector pin.

As a preferred technical scheme of the invention, the dust removal device also comprises a dust removal mechanism, wherein the dust removal mechanism comprises:

the right front side of the base is connected with a fourth fixed block;

one side of the base, which is close to the fourth fixed block, is connected with a third fixed plate, and the third fixed plate is positioned on one side of the fourth fixed block;

the fourth fixing block is provided with a water pipe;

the upper part of the water pipe is connected with a spray head which is positioned on the side of the movable plate;

the elastic parts are connected to two sides of the third fixing plate, and the water pipe penetrates through the elastic parts;

the fourth fixing plate is connected between the elastic parts;

the bottom of the wedge block is connected with the wedge block, and the wedge block is in extrusion fit with the fourth fixing plate.

The invention has the beneficial effects that: 1. through the cooperation between cutting mechanism, stock stop, pushing equipment and the liftout mechanism, can replace the people to cut the log, can realize automatic material, keep off the material and cut, whole journey need not people and inserts the hand, improves people's work efficiency, can realize moreover that the log specification that the cutting came out is unified.

2. Through fixed establishment, shake the cooperation between material mechanism and the dust removal mechanism, can fix the log before the cutting to in cutting process, the situation of log roll-off appears, can shake the log after the cutting, can produce a lot of dusts when this equipment moves, can accomplish the effect of removing dust through the watering.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of the cutting mechanism of the present invention.

Fig. 3 is a schematic perspective view of the stock stop of the present invention.

Fig. 4 is a schematic perspective view of the pushing mechanism of the present invention.

Fig. 5 is a schematic perspective view of the material ejecting mechanism of the present invention.

Fig. 6 is a schematic perspective view of the fixing mechanism of the present invention.

Fig. 7 is a schematic perspective view of the material shaking mechanism of the present invention.

Fig. 8 is a schematic perspective view of the dust removing mechanism of the present invention.

Reference numerals: 1_ base, 2_ cutting mechanism, 21_ first servo motor, 22_ bearing seat, 23_ first rotating shaft, 24_ second rotating shaft, 25_ bevel gear set, 26_ cutter, 3_ stop mechanism, 31_ support column, 32_ support plate, 33_ rectangular groove, 34_ clamping block, 35_ baffle, 36_ first fixing block, 4_ pushing mechanism, 41_ second servo motor, 42_ third rotating shaft, 43_ rotating rod, 44_ moving plate, 45_ sliding sleeve, 46_ first telescopic rod, 47_ second fixing block, 48_ first spring, 49_ rectangular sliding block, 5_ pushing mechanism, 51_ first fixing plate, 52_ second telescopic rod, 53_ pushing plate, 54_ second spring, 6_ fixing mechanism, 61_ second fixing plate, 62_ first sliding block, 63_ third telescopic rod, 64_ second sliding block, 65_ fourth telescopic rod, 66_ third spring, 67_ third fixing block, 7_ shake material mechanism, 71_ flitch down, 72_ collecting box, 73_ ejector pin, 8_ dust removal mechanism, 81_ fourth fixed block, 82_ third fixed plate, 83_ water pipe, 84_ wedge, 85_ elastic component, 86_ fourth fixed plate, 87_ shower nozzle.

Detailed Description

The invention is further described below with reference to the figures and examples.

Example 1

The utility model provides an even segmentation cutting equipment of log for building materials, as shown in figure 1, including base 1, cutting mechanism 2, stock stop 3, pushing equipment 4 and liftout mechanism 5, the base 1 right side is connected with cutting mechanism 2, and the base 1 right side is connected with stock stop 3, and cutting mechanism 2 is located stock stop 3 below, and the base 1 left side is connected with pushing equipment 4, is connected with liftout mechanism 5 on the stock stop 4.

When people need to cut the log, the log is firstly placed on the material ejecting mechanism 5 and the material pushing mechanism 4, then the parts of the cutting mechanism 2 and the material pushing mechanism 4 are started, so that the material pushing mechanism 4 continuously pushes the log, meanwhile, the cutting mechanism 2 cuts the log, and after the round is cut, the log is taken out, and the parts of the cutting mechanism 2 and the material pushing mechanism 4 are closed.

Example 2

On the basis of embodiment 1, as shown in fig. 2 to 4, the cutting mechanism 2 includes a first servo motor 21, a bearing seat 22, a first rotating shaft 23, a second rotating shaft 24, a bevel gear set 25 and a cutter 26, the first servo motor 21 is connected to the front right side of the base 1, the first rotating shaft 23 is connected to an output shaft of the first servo motor 21, the bearing seat 22 is connected to the front right side of the base 1, the bearing seat 22 is located on the left side of the first servo motor 21, the second rotating shaft 24 is rotatably connected to the upper portion of the bearing seat 22, the bevel gear set 25 is connected between the right side of the second rotating shaft 24 and the top of the first rotating shaft 23, and the cutter 26 is connected to the left side of.

When the log needs to be cut, the first servo motor 21 is started, the output shaft of the first servo motor 21 rotates to drive the first rotating shaft 23, the bevel gear set 25, the second rotating shaft 24 and the cutter 26 to rotate continuously, so that the cutter 26 continuously cuts the log, and the first servo motor 21 is closed after the round log is cut.

Stop mechanism 3 is including support column 31, backup pad 32, fixture block 34, baffle 35 and first fixed block 36, and base 1 right side front side evenly is connected with support column 31, is connected with support pad 32 between the support column 31 top, and support pad 32 front portion evenly opens there is rectangular channel 33, and support pad 32 top sliding connection has baffle 35, has inserted fixture block 34 between backup pad 32 left side and the rectangular channel 33, and fixture block 34 top is connected with first fixed block 36.

Before the cutting log, adjust stock stop 3 earlier, dial first fixed block 36 and fixture block 34, according to the length that people needed the log cutting, move baffle 35 for baffle 35 moves required position, injects first fixed block 36 and fixture block 34, can adjust the position of baffle 35 like this, moves right after the log is cut, under the effect of baffle 35, can block the log, so that people are to the collection of log.

The pushing mechanism 4 comprises a second servo motor 41, a third rotating shaft 42, a rotating rod 43, a moving plate 44, a sliding sleeve 45, a first telescopic rod 46, a second fixed block 47, a first spring 48 and a rectangular sliding block 49, the left rear side of the base 1 is connected with the second servo motor 41, the output shaft of the second servo motor 41 is connected with the third rotating shaft 42, the top of the third rotating shaft 42 is connected with the rotating rod 43, the left side and the right side of the top of the base 1 are connected with the rectangular sliding block 49 in a sliding manner, the moving plate 44 is connected between the tops of the rectangular sliding blocks 49, the moving plate 44 is connected with the pushing mechanism 5, the left side and the right side of the top of the base 1 are connected with the second fixed block 47, the first telescopic rods 46 are connected between the front side of the second fixed block 47, the first springs 48 are connected between the rear side of the moving plate 44 and the front side of the second fixed block 47, the first springs 48, the sliding sleeve 45 is slidably connected with the rotating rod 43.

When people need to cut the logs, the logs are placed on the moving plate 44, the logs are continuously pushed rightwards through the material ejecting mechanism 5, meanwhile, the second servo motor 41 is started, an output shaft of the second servo motor 41 rotates to drive the third rotating shaft 42 and the rotating rod 43 to continuously rotate, the sliding sleeve 45 and the moving plate 44 are driven to continuously move back and forth, when the moving plate 44 moves backwards, the material ejecting mechanism 5 and the logs are driven to push backwards, the first telescopic rod 46 and the first spring 48 are compressed, when the moving plate 44 moves forwards, the material ejecting mechanism 5 and the logs are driven to push forwards, the first telescopic rod 46 and the first spring 48 are stretched, the logs can be continuously pushed forwards and backwards through repeating the operations, and after the operations are completed, the second servo motor 41 can be closed.

Example 3

On the basis of embodiment 2, as shown in fig. 5 to 8, the ejection mechanism 5 includes a first fixing plate 51, a second telescopic rod 52, a push plate 53 and a second spring 54, the left side of the top of the moving plate 44 is connected with the first fixing plate 51, the front and rear sides of the right portion of the first fixing plate 51 are connected with the second telescopic rod 52, the push plate 53 is connected between the right sides of the second telescopic rod 52, the front and rear sides of the right portion of the first fixing plate 51 and the front and rear sides of the left portion of the push plate 53 are connected with the second spring 54, and the second spring 54 is sleeved outside the second telescopic rod 52.

When the log needs to be cut, the push plate 53 is moved leftwards, the second spring 54 and the second telescopic rod 52 are compressed, then the log is placed on the moving plate 44, the hand is loosened, the push plate 53 is driven to move rightwards to push the log rightwards under the action of the second spring 54, the right end of the log is tightly attached to the baffle 35, the second telescopic rod 52 is stretched and reset, and the push plate 53 moves rightwards to reset under the action of the second spring 54 along with continuous cutting of the log.

The fixing mechanism 6 comprises a second fixing plate 61, a first sliding block 62, a third telescopic rod 63, a second sliding block 64, a fourth telescopic rod 65, a third spring 66 and a third fixing block 67, the front side of the top of the moving plate 44 is evenly connected with the second fixing plate 61, the right side of the push plate 53 is connected with the first sliding block 62 in a sliding manner, the right side of the first sliding block 62 is connected with the third telescopic rod 63, the right side of the moving plate 44 is connected with the second sliding block 64 in a sliding manner, the top of the second sliding block 64 is connected with the right side of the third telescopic rod 63, the front side of the second sliding block 64 is connected with the fourth telescopic rod 65, the right front side of the bottom of the moving plate 44 is connected with the third fixing block 67, the rear side of the third fixing block 67 is connected with the front side of the fourth telescopic rod 65, the third spring 66 is connected between the rear side of the third fixing block.

When a log needs to be placed, when the push plate 53 moves leftwards, the first slide block 62 is driven to move leftwards, the third telescopic rod 63 is stretched, then the third telescopic rod 63 moves backwards to drive the first slide block 62 and the second slide block 64 to move backwards, the fourth telescopic rod 65 and the third spring 66 are stretched, when the log passes through the bottom of the second fixing plate 61, when the push plate 53 moves rightwards, the first slide block 62 is driven to move rightwards, the third telescopic rod 63 is compressed, the third telescopic rod 63 is simultaneously loosened, under the action of the third spring 66, the fourth telescopic rod 65 is driven to compress, so that the first slide block 62, the second slide block 64 and the third telescopic rod 63 move forwards to press the log, the log can be fixed, the log can not slide out, along with continuous cutting of the log, under the action of the third spring 66, the fourth telescopic rod 65 is driven to compress and reset, and the first slide block 62, the third telescopic rod 63 and the second slide block 64 are driven to move and reset, the push plate 53 moves to reset and then drives the third telescopic rod 63 to compress and reset.

The material shaking mechanism 7 comprises a blanking plate 71, a collecting box 72 and an ejector rod 73, the top of the rear side of the supporting plate 32 is connected with the blanking plate 71, the bottom of the second sliding block 64 is connected with the ejector rod 73, the right rear side of the base 1 is connected with the collecting box 72 in a sliding mode, and the left front side of the collecting box 72 is connected with the ejector rod 73.

When the second sliding block 64 moves back and forth, the collecting box 72 is driven to move back and forth continuously, and when the logs are cut and flow into the collecting box 72 through the blanking plate 71, the logs are shaken continuously by the collecting box 72.

Still including dust removal mechanism 8, dust removal mechanism 8 is including fourth fixed block 81, third fixed plate 82, water pipe 83, wedge 84, elastic component 85, fourth fixed plate 86 and

shower nozzle

87, 1 right side front of the base is connected with fourth fixed

block

81, 1 right side front of the base is connected with third fixed plate 82, third fixed plate 82 is located fourth fixed block 81 rear side, be equipped with water pipe 83 on the fourth fixed block 81, water pipe 83 upper portion is connected with shower nozzle 87, shower nozzle 87 is located movable plate 44 top, all be connected with elastic component 85 around the upper portion left side of third fixed plate 82, water pipe 83 passes elastic component 85 middle part, be connected with fourth fixed plate 86 between the elastic component 85 left side, third fixed block 67 bottom is connected with wedge 84, wedge 84 and fourth fixed plate 86 extrusion fit.

This equipment operation can produce a lot of dusts, put through leather hose and water pipe 83, in the rivers inlet tube 83, when third fixed block 67 removes and drives wedge 84 and move forward, wedge 84 extrudes fourth fixed plate 86, it makes elastic component 85 compressed to drive fourth fixed plate 86 to move right, water pipe 83 is closed this moment, when third fixed block 67 removes and drives wedge 84 and move backward, wedge 84 and fourth fixed plate 86 separate, under elastic component 85's effect, it resets to drive fourth fixed plate 86 to move left, water just so can follow the blowout in the shower nozzle 87, the effect of dust removal can be accomplished in the operation more than the repetition.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. The utility model provides a log even segmentation cutting equipment for building materials which characterized in that, including:

the cutting machine comprises a base (1) and a cutting mechanism (2), wherein the base (1) is connected with the cutting mechanism (2);

the base (1) is connected with the stock stop mechanism (3), and the cutting mechanism (2) is positioned on the side of the stock stop mechanism (3);

the base (1) is connected with a material pushing mechanism (4);

the material pushing mechanism (5) is connected to the material pushing mechanism (4).

2. The apparatus for uniformly dividing a log for building materials according to claim 1, wherein the cutting means (2) comprises:

the device comprises a first servo motor (21), wherein one side of a base (1) is connected with the first servo motor (21);

the output shaft of the first servo motor (21) is connected with the first rotating shaft (23);

the bearing seat (22) is connected to one side, close to the first rotating shaft (23), of the base (1), and the bearing seat (22) is located on one side of the first servo motor (21);

the bearing seat (22) is rotatably connected with the second rotating shaft (24);

a bevel gear set (25) is connected between the second rotating shaft (24) and the top of the first rotating shaft (23);

and one side of the second rotating shaft (24), which is far away from the bevel gear set (25), is connected with a cutter (26).

3. The even segmentation cutting equipment of log for building materials of claim 2, characterized in that, the stock stop (3) includes:

the supporting columns (31) are uniformly connected to one side, close to the first servo motor (21), of the base (1);

the supporting plates (32) are connected between the tops of the supporting columns (31);

the supporting plate (32) is uniformly provided with rectangular grooves (33), and the top of the supporting plate (32) is connected with the baffle (35) in a sliding manner;

the clamping block (34) is inserted between the support plate (32) and the rectangular groove (33);

the top of the clamping block (34) is connected with the first fixing block (36).

4. The uniform sectional cutting apparatus for the round lumber for building material as claimed in claim 3, wherein the pusher mechanism (4) comprises:

the left rear side of the base (1) is connected with a second servo motor (41);

the output shaft of the second servo motor (41) is connected with a third rotating shaft (42);

the top of the third rotating shaft (42) is connected with a rotating rod (43);

the rectangular sliding blocks (49) are connected to the two sides of the top of the base (1) in a sliding mode;

the moving plate (44) is connected between the tops of the rectangular sliding blocks (49), and the moving plate (44) is connected with the material ejecting mechanism (5);

the two sides of the top of the base (1) are connected with second fixed blocks (47);

the first telescopic rods (46) are connected between the first telescopic rod (46), the second fixed block (47) and the moving plate (44);

the first springs (48) are connected between the moving plate (44) and the second fixed block (47), and the first springs (48) are sleeved on the outer side of the first telescopic rod (46);

a sliding sleeve (45), one side of the moving plate (44) is connected with the sliding sleeve (45), and the sliding sleeve (45) is connected with the rotating rod (43) in a sliding way.

5. The uniform sectional cutting apparatus for building material logs according to claim 4, characterized in that the ejector mechanism (5) comprises:

the first fixed plate (51) is connected to one side of the top of the moving plate (44);

the two sides of the first fixing plate (51) are both connected with second telescopic rods (52);

the push plate (53) is connected between the second telescopic rods (52);

and the second springs (54) are connected between the two sides of the first fixing plate (51) and the two sides of the push plate (53), and the second springs (54) are sleeved on the outer side of the second telescopic rod (52).

6. The apparatus for uniformly dividing and cutting round timbers for building materials according to claim 5, further comprising a fixing mechanism (6), wherein the fixing mechanism (6) comprises:

the top of the moving plate (44) is uniformly connected with the second fixed plate (61);

the first sliding block (62) is connected with the push plate (53) in a sliding manner;

the first sliding block (62) is connected with a third telescopic rod (63);

the side, far away from the first sliding block (62), of the moving plate (44) is connected with a second sliding block (64) in a sliding mode, and the top of the second sliding block (64) is connected with a third telescopic rod (63);

the second sliding block (64) is connected with a fourth telescopic rod (65);

the bottom of the moving plate (44) is connected with a third fixed block (67), and the third fixed block (67) is connected with a fourth telescopic rod (65);

and a third spring (66) is connected between the third fixed block (67) and the second sliding block (64), and the third spring (66) is sleeved on the outer side of the fourth telescopic rod (65).

7. The even segmentation cutting equipment of log for building materials of claim 6, characterized by that, still include shaking the material mechanism (7), shake the material mechanism (7) to include:

the top of the supporting plate (32) is connected with the blanking plate (71);

the bottom of the second sliding block (64) is connected with a top rod (73);

collecting box (72), base (1) are close to down flitch (71) one side sliding connection have collecting box (72), and collecting box (72) are connected with ejector pin (73).

8. The even segmentation cutting equipment of log for building materials of claim 7, characterized by that, still include dust removal mechanism (8), dust removal mechanism (8) includes:

the right front side of the base (1) is connected with a fourth fixed block (81);

the base (1) is connected with a third fixing plate (82) at one side close to the fourth fixing block (81), and the third fixing plate (82) is positioned at one side of the fourth fixing block (81);

the water pipe (83) is arranged on the fourth fixing block (81);

the upper part of the water pipe (83) is connected with the spray head (87), and the spray head (87) is positioned on the side of the moving plate (44);

the elastic piece (85) is connected to both sides of the third fixing plate (82), and the water pipe (83) penetrates through the elastic piece (85);

a fourth fixing plate (86), wherein the fourth fixing plate (86) is connected between the elastic pieces (85);

the bottom of the wedge block (84) and the bottom of the third fixing block (67) are connected with the wedge block (84), and the wedge block (84) is in extrusion fit with the fourth fixing plate (86).