CN111114147B

CN111114147B - Auxiliary device of number pipe machine

Info

Publication number: CN111114147B
Application number: CN201911367189.7A
Authority: CN
Inventors: 李钢
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-12-01
Anticipated expiration: 2039-12-26
Also published as: CN111114147A

Abstract

The invention discloses an auxiliary device of a numbering pipe machine, which relates to the field of numbering pipe machines and comprises a bottom plate and the numbering pipe machine, wherein matching holes are formed in the bottom plate on one side of an inlet and one side of an outlet of the numbering pipe machine; the moving block is positioned in the matching hole, and the driving part is in power connection with the moving block; the fixed plates are symmetrically arranged on the upper end surface of the moving block, and the upper end surface of each fixed plate is provided with a shaft groove; the pipeline winding device comprises a main shaft and a wheel disc detachably connected with the main shaft, wherein two ends of the main shaft are placed in a shaft groove, and the wheel disc is used for winding a pipeline; the first motors are in one-to-one correspondence with the moving blocks, fixed on one of the fixed plates and used for driving the main shaft to rotate; when the number pipe machine starts to work, the line pipe is enabled to be overlapped with the central axis where the inlet and the outlet of the number pipe machine are located all the time through the driving part, so that an included angle formed between the line pipe and the central axis where the inlet and the outlet of the number pipe machine are located is eliminated, the friction force between the number pipe machine and the line pipe is effectively reduced, and the line pipe is prevented from being damaged due to the friction force.

Description

Auxiliary device of number pipe machine

Technical Field

The invention relates to the field of numbering and tube machines, in particular to an auxiliary device of a numbering and tube machine.

Background

The numbering machine is also called a line number printer, and is called a line number machine and a marking machine for short. The PVC sleeve, the heat-shrinkable tube, the special adhesive label and the mark band can be printed with characters, are generally used for secondary line marks of electric control, power distribution and switchgear, are special equipment for wiring marks of electric control, power distribution equipment and comprehensive wiring engineering, and can meet the needs of electric wire distinguishing mark marks of power plants, electrical equipment plants, transformer substations and power industries. At present, the computer line number printer (or called electronic line number printer) is widely applied, belongs to a thermal transfer printer, and is provided with a keyboard, so that the operation is simple and the use is convenient.

The applicant found that: because the spool twines on the rim plate usually, the rim plate is fixed after a position, at number pipe machine working process, the spool on the unwrapping wire rim plate is more and more less, receive spool on the line rim plate more and more, because there is certain distance between rim plate and the number pipe machine, this spool in the distance will with number pipe machine import and export the axis at place between form an contained angle, this contained angle will make the spool buckle, and produce great frictional force between the import and export of messenger's spool and number pipe machine, make the spool impaired easily.

Disclosure of Invention

In view of the above, the present invention is directed to an auxiliary device for a numbering machine, so as to solve the technical problem in the prior art that, since a spool is usually wound on a wheel disc, and the wheel disc is fixed at a position, during the operation of the numbering machine, fewer spools are placed on a pay-off wheel disc, and more spools are placed on a take-up wheel disc, and since a certain distance is formed between the wheel disc and the numbering machine, an included angle is formed between the spool in the distance and a central axis where an inlet and an outlet of the numbering machine are located, and the included angle bends the spool, and generates a large friction force between the spool and the inlet and the outlet of the numbering machine, so that the spool is easily damaged.

Based on the aim, the invention provides an auxiliary device of a numbering machine, which comprises

The numbering pipe machine comprises a base plate and a numbering pipe machine fixed on the base plate through cushion blocks, wherein matching holes are formed in the base plate on one side of an inlet and one side of an outlet of the numbering pipe machine;

the moving block is positioned in the matching hole, and the driving part is in power connection with the moving block;

the fixed plates are symmetrically arranged on the upper end surface of the moving block, and the upper end surface of each fixed plate is provided with a shaft groove;

the pipeline winding device comprises a main shaft and a wheel disc detachably connected with the main shaft, wherein two ends of the main shaft are placed in a shaft groove, and the wheel disc is used for winding a pipeline;

the first motors are in one-to-one correspondence with the moving blocks, fixed on one of the fixed plates and used for driving the main shaft to rotate;

when the numbering pipe machine starts to work, the moving block is located on one side of the inlet of the numbering pipe machine, the driving portion drives the moving block to move downwards, the moving block is located on one side of the outlet of the numbering pipe machine, and the driving portion drives the moving block to move upwards, so that the spool is always overlapped with a central axis where the inlet and the outlet of the numbering pipe machine are located.

Further comprises a telescopic rod and a second spring, a plurality of side grooves are arranged on the side surface of the main shaft, a groove is arranged at the middle position of the bottom of the side groove, a through hole for the main shaft to pass through is arranged at the central position of the wheel disc, the inner side wall of the through hole is internally provided with an inner cavity which is in one-to-one correspondence with the side surface groove, one end of the telescopic rod is positioned in the inner cavity, and is connected with the inner cavity in a sliding way, the other end of the telescopic rod extends into the through hole, the second spring is positioned in the inner cavity, one end of the telescopic rod is fixed on the end surface of the telescopic rod positioned in the inner cavity, the other end of the telescopic rod is fixedly connected with the bottom of the inner cavity, after the telescopic rods are in one-to-one correspondence with the side grooves, the telescopic rods overcome the elasticity of the second spring, one part of the telescopic rods are contracted into the inner cavity, and the telescopic rods slide in the side grooves, when the telescopic rod slides to the position of the groove, the telescopic rod moves into the groove under the action of the elastic force of the second spring.

Furthermore, the circular arc-shaped groove of the groove is in circular arc transition at the contact position of the groove and the bottom of the side groove, and the end face of the telescopic rod in the through hole is a cone.

Further, the driving part comprises a second motor, a driving shaft, a first gear and a second gear, a driving groove is arranged in the moving block, the driving shaft is positioned in the bottom plate, and is rotatably connected with the bottom plate, one end of the bottom plate extends to the outside of the bottom plate, the driving shaft passes through the driving groove, the driving shaft in the driving groove at the outlet side of the numbering machine is in key connection with the first gear, the driving shaft in the driving groove at the inlet side of the numbering machine is in key connection with the second gear, the second motor is fixed on the bottom plate, and the output shaft of the second motor is connected with the driving shaft through a coupling, the first gear is meshed with a first straight rack arranged in the corresponding driving groove, the second gear is meshed with a second spur rack arranged in the corresponding driving groove, and when the second motor is started, the moving directions of the two moving blocks are opposite.

The motor is characterized by further comprising a rectangular block, wherein the rectangular block is fixed on the end face, facing the first motor, of the spindle, a rectangular groove matched with the rectangular block is formed in the output shaft of the first motor, and the rectangular block is combined with the rectangular groove when the spindle is placed in the shaft groove.

The spindle further comprises a limiting part, the limiting part is arranged in the side wall of the shaft groove, and the end part of the spindle is limited at the bottom of the shaft groove through the limiting part after the end part of the spindle is placed in the shaft groove.

Further, spacing portion includes threaded rod, gag lever post and pivot, the lateral wall of shaft groove is equipped with the side groove, the one end of threaded rod with the pivot rotate to be connected, the pivot is fixed in the position that the side groove is close to the bottom, threaded rod and fixed plate threaded connection, its one end is located the top of fixed plate, and the other end passes the fixed plate to extend to the side inslot, work as the tip of main shaft is placed in the shaft groove after, rotates the threaded rod, makes the tip and the gag lever post contact of threaded rod, and the drive gag lever post contacts with the upper portion branch of main shaft tip side surface.

Furthermore, spacing portion still includes annular rod and first spring, the gag lever post is equipped with the annular ring, the one end of annular rod and the lateral wall fixed connection in side groove, annular rod and annular ring sliding connection, the centre of a circle of annular rod, the centre of a circle of annular ring coincide with the centre of a circle of pivot, first spring cup joints in the annular rod, and the one end of first spring and the side fixed connection of gag lever post, the other end of first spring and the lateral wall fixed connection in side groove.

The invention has the beneficial effects that: when the numbering pipe machine starts to work, the driving part drives the moving block to move downwards; the driving part drives the moving block to move upwards; the wire pipe is enabled to be always coincident with the central axis where the inlet and the outlet of the number pipe machine are located, so that an included angle formed between the wire pipe and the central axis where the inlet and the outlet of the number pipe machine are located is eliminated, the friction force between the number pipe machine and the wire pipe is effectively reduced, and the wire pipe is prevented from being damaged due to the friction force.

Drawings

FIG. 1 is a top view of an embodiment of the present invention;

FIG. 2 is a front view of an embodiment of the present invention;

FIG. 3 is an enlarged view of a limiting portion according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 6 is an enlarged view of a first motor in an embodiment of the present invention;

fig. 7 is a schematic diagram of the connection between the spindle and the disk in the embodiment of the present invention.

The automatic pipe bending machine comprises a base plate 1, a pipe bending machine 2, a pipe bending machine 3, a cushion block 4, a moving block 5, a main shaft 5, a wheel disc 6, a first motor 7, a matching hole 8, a second motor 9, a driving shaft 10, a shaft groove 11, a side groove 12, a threaded rod 13, a limiting rod 14, a rotating shaft 15, an annular hole 16, an annular rod 17, a first spring 18, a driving groove 19, a first gear 20, a second gear 21, a rectangular groove 22, a rectangular block 23, a side groove 24, a groove 25, an inner cavity 26, an expansion rod 27, a second spring 28 and a fixing plate 29.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.

In view of the above, a first aspect of the present invention proposes an embodiment of an auxiliary device for a numbering machine, as shown in fig. 1 and 2, comprising

The numerical control machine comprises a base plate 1 and a numerical pipe machine 2 fixed on the base plate 1 through a cushion block 3, wherein matching holes 8 are formed in the base plate 1 on one side of an inlet and one side of an outlet of the numerical pipe machine 2;

a moving block 4 positioned in the matching hole 8 and a driving part dynamically connected with the moving block 4;

the fixed plates 29 are symmetrically arranged on the upper end surface of the moving block 4, and the upper end surface of each fixed plate 29 is provided with a shaft groove 11;

the pipeline winding device comprises a main shaft 5 and a wheel disc 6 detachably connected with the main shaft 5, wherein two ends of the main shaft 5 are placed in a shaft groove 11, and the wheel disc 6 is used for winding a pipeline;

the first motors 7 correspond to the moving blocks 4 one by one, the first motors 7 are fixed on one of the fixing plates 29, and the first motors 7 are used for driving the main shaft 5 to rotate;

in the embodiment, firstly, a wheel disc 6 wound with a spool without a printed number is installed on a spindle 5, and the spindle 5 is placed in a shaft groove 11 on the inlet side of the numbering machine 2, so that the corresponding first motor 7 can drive the spindle 5 to rotate; then the reel 6 without the winding bobbin is mounted on another main shaft 5, the main shaft 5 is placed in a shaft groove 11 at the outlet side of the numbering machine 2, so that the corresponding first motor 7 can drive the main shaft 5 to rotate, then the numbering pipe machine 2 starts to work, the spool is wound on a wheel disc 6 positioned on one side of an outlet of the numbering pipe machine 2 after penetrating through the numbering pipe machine 2, a moving block 4 positioned on one side of an inlet of the numbering pipe machine 2 is driven by a driving part to move downwards, the moving block 4 positioned on one side of the outlet of the numbering pipe machine 2 is driven by the driving part to move upwards, so that the spool is always superposed with a central axis where the inlet and the outlet of the numbering pipe machine 2 are positioned, therefore, the included angle formed between the central axis where the line pipe and the inlet and outlet of the number pipe machine 2 are located is eliminated, the friction force between the number pipe machine 2 and the line pipe is effectively reduced, and the line pipe is prevented from being damaged due to the friction force.

As an embodiment, as shown in fig. 1 and 7, the spindle includes a telescopic rod 27 and a second spring 28, a plurality of side grooves 24 are formed in a side surface of the spindle 5, a groove 25 is formed in a middle position of a bottom of each side groove 24, a through hole through which the spindle 5 passes is formed in a center position of the wheel disc 6, inner cavities 26 corresponding to the side grooves 24 one to one are formed in inner side walls of the through hole, one end of the telescopic rod 27 is located in the inner cavity 26 and slidably connected to the inner cavity 26, the other end of the telescopic rod 27 extends into the through hole, the second spring 28 is located in the inner cavity 26, one end of the second spring is fixed to an end surface of the telescopic rod 27 located in the inner cavity 26, and the other end of the second spring is fixedly connected.

In this embodiment, the process of mounting the wheel disc 6 on the main shaft 5 is as follows, after the telescopic rod 27 and the side groove 24 are in one-to-one correspondence, the telescopic rod 27 overcomes the elastic force of the second spring 28, a part of the telescopic rod 27 is contracted into the inner cavity 26, and the telescopic rod 27 is made to slide in the side groove 24, when the telescopic rod 27 slides to the position of the groove 25, the telescopic rod 27 moves into the groove 25 under the elastic force of the second spring 28, so that the wheel disc 6 can be mounted on the main shaft 5, and the movement state of the wheel disc 6 is the same as the movement state of the main shaft 5, when the wheel disc 6 needs to be removed from the rotating shaft 5, an external force needs to be applied along the central axis direction of the main shaft 5 from the side of the wheel disc 5, so that the telescopic rod 27 overcomes the elastic force of the second spring 28, and is contracted into the inner cavity 26, when the telescopic rod 27 is separated from the groove 25, the side groove, this allows for easy replacement of the wheel disc 6.

As an embodiment, as shown in fig. 7, the groove 25 is an arc groove, and the contact position of the groove 25 and the bottom of the side groove 24 adopts an arc transition, so that when the end of the telescopic rod 27 is acted by a lateral force on the wheel disc 6, the telescopic rod 27 can be separated from the groove 25, and the end surface of the telescopic rod 27 in the through hole is a cone, so that the telescopic rod can more conveniently overcome the elastic force of the second spring 28 and enter the side groove 24.

As an embodiment, as shown in fig. 1, 2, 4 and 5, the driving part includes a second motor 9, a driving shaft 10, a first gear 20 and a second gear 21, a driving groove 19 is formed inside the moving block 4, the driving shaft 10 is located inside the bottom plate 1 and is rotatably connected to the bottom plate 1, one end of the bottom plate 1 extends to the outside of the bottom plate 1, the driving shaft 10 passes through the driving groove 19, the driving shaft 10 in the driving groove 19 on the outlet side of the numbering machine 2 is keyed with the first gear 20, the driving shaft 10 in the driving groove 19 on the inlet side of the numbering machine 2 is keyed with the second gear 21, the second motor 9 fixes the bottom plate 1, the output shaft of the second motor 9 is coupled with the driving shaft 10, the first gear 20 is engaged with a first spur rack provided in the corresponding driving groove 19, the second gear 21 is engaged with a second spur rack provided in the corresponding driving groove 19, when the second motor 9 is started, the moving directions of the two moving blocks 4 are opposite.

In the embodiment, when the second motor 9 is started, the driving shaft 10 can drive the moving block 4 on the inlet side of the numbering machine 2 to move downwards, so that the moving block 4 on the outlet side of the numbering machine 2 moves upwards.

As an embodiment, as shown in fig. 6, the spindle comprises a rectangular block 23, the rectangular block 23 is fixed on the end surface of the spindle 5 facing the first motor 7, the output shaft of the first motor 7 is provided with a rectangular groove 22 matching with the rectangular block 23, and when the spindle 5 is placed in the shaft groove 11, the rectangular block 23 is combined with the rectangular groove 22 to ensure that the spindle 5 can be driven to rotate when the first motor 7 is started.

As an implementation mode, including spacing portion, be equipped with in the lateral wall of axostylus axostyle 11 spacing portion the tip of main shaft 5 is placed in axostylus axostyle 11 back, through spacing portion with the tip position restriction of main shaft 5 in the bottom of axostylus axostyle 11, prevent this device under the exogenic action, make main shaft 5 unfixed in the position of axostylus axostyle 11, and then make the position of rim plate 6 unfixed, cause spool and number pipe machine to import and export and can also form the contained angle under the exogenic action between the axis at place.

As an embodiment, as shown in fig. 2 and 3, the limiting portion includes a threaded rod 13, a limiting rod 14 and a rotating shaft 15, a side groove 12 is formed in a side wall of the shaft groove 11, one end of the threaded rod 13 is rotatably connected to the rotating shaft 15, the rotating shaft 15 is fixed at a position of the side groove 12 near the bottom, the threaded rod 13 is in threaded connection with a fixing plate 29, one end of the threaded rod 13 is located above the fixing plate 29, the other end of the threaded rod passes through the fixing plate 29 and extends into the side groove 12, and after the end of the spindle 5 is placed in the shaft groove 11, the threaded rod 13 is rotated to contact the end of the threaded rod 13 with the limiting rod 14, so as to drive the limiting rod 14 to contact with an upper portion of a side surface of the end.

In this embodiment, when the end of the spindle 5 is not yet in contact with the bottom of the shaft groove 11, the stopper 14 is located in the side groove 12, and when the end of the spindle 5 is in contact with the bottom of the shaft groove 11, the threaded rod 13 is rotated to bring the end of the threaded rod 13 into contact with the stopper 14, so that the stopper 14 can be driven to be in contact with the upper portion of the side surface of the end of the spindle 5, thereby fixing the position of the spindle 5 and enabling the spindle 5 to rotate only at the bottom of the shaft groove 11.

Further, spacing portion still includes annular rod 17 and first spring 18, gag lever post 14 is equipped with annular hole 16, the one end of annular rod 17 and the lateral wall fixed connection of side groove 12, annular rod 17 and annular hole 16 sliding connection, the centre of a circle of annular rod 17, the centre of a circle of annular hole 16 and the centre of a circle coincidence of pivot 15, first spring 18 cup joints in annular rod 17, and the one end of first spring 18 and the side fixed connection of gag lever post 14, the other end of first spring 18 and the lateral wall fixed connection of side groove 12.

In this embodiment, when the main shaft 5 is only rotated at the bottom of the shaft groove 11 by the limiting rod 14, the first spring 18 is in a stretched state, so that when the main shaft 5 needs to be removed, the threaded rod 13 is reversed, and at this time, the limiting rod 14 is gradually retracted into the side groove 12 under the pulling force of the first spring 18, so that the main shaft 5 is convenient to remove.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. The utility model provides an auxiliary device of number pipe machine which characterized in that: comprises that

The numerical pipe machine comprises a base plate (1) and a numerical pipe machine (2) fixed on the base plate (1) through a cushion block (3), wherein matching holes (8) are formed in the base plate (1) on one side of an inlet and one side of an outlet of the numerical pipe machine (2);

the moving block (4) is positioned in the matching hole (8), and the driving part is in power connection with the moving block (4);

the fixed plates (29) are symmetrically arranged on the upper end surface of the moving block (4), and the upper end surface of each fixed plate (29) is provided with a shaft groove (11);

the pipeline winding device comprises a main shaft (5) and a wheel disc (6) detachably connected with the main shaft (5), wherein two ends of the main shaft (5) are placed in a shaft groove (11), and the wheel disc (6) is used for winding a pipeline;

the first motors (7) correspond to the moving blocks (4) one by one, the first motors (7) are fixed on one of the fixing plates (29), and the first motors (7) are used for driving the main shaft (5) to rotate;

when the numbering pipe machine (2) starts to work, the driving part drives the moving block (4) to move downwards, the moving block (4) is located on one side of the inlet of the numbering pipe machine (2), the driving part drives the moving block (4) to move upwards, and the spool is enabled to be overlapped with the central axis where the inlet and the outlet of the numbering pipe machine (2) are located all the time;

the limiting device comprises a limiting part, wherein the limiting part is arranged in the side wall of the shaft groove (11), and the end part of the main shaft (5) is limited at the bottom of the shaft groove (11) through the limiting part after the end part of the main shaft (5) is placed in the shaft groove (11);

the limiting part comprises a threaded rod (13), a limiting rod (14) and a rotating shaft (15), a side groove (12) is formed in the side wall of the shaft groove (11), one end of the threaded rod (13) is rotatably connected with the rotating shaft (15), the rotating shaft (15) is fixed at the position, close to the bottom, of the side groove (12), the threaded rod (13) is in threaded connection with a fixing plate (29), one end of the threaded rod is located above the fixing plate (29), the other end of the threaded rod penetrates through the fixing plate (29) and extends into the side groove (12), and when the end part of the main shaft (5) is placed in the shaft groove (11), the threaded rod (13) is rotated to enable the end part of the threaded rod (13) to be in contact with the limiting rod (14) and drive the limiting rod (14) to be in contact with the upper portion of the side surface;

the spacing portion still includes annular rod (17) and first spring (18), gag lever post (14) are equipped with annular hole (16), the lateral wall fixed connection of the one end of annular rod (17) and side groove (12), annular rod (17) and annular hole (16) sliding connection, the centre of a circle of annular rod (17), the centre of a circle of annular hole (16) and the centre of a circle coincidence of pivot (15), first spring (18) cup joint in annular rod (17), and the side fixed connection of the one end of first spring (18) and gag lever post (14), the other end of first spring (18) and the lateral wall fixed connection of side groove (12).

2. The auxiliary device of the numbering machine as claimed in claim 1, wherein: the telescopic rod type spindle comprises a telescopic rod (27) and a second spring (28), wherein a plurality of side grooves (24) are formed in the side surface of the spindle (5), a groove (25) is formed in the middle position of the bottom of each side groove (24), a through hole for the spindle (5) to penetrate through is formed in the center position of the wheel disc (6), inner cavities (26) corresponding to the side grooves (24) one by one are formed in the inner side wall of the through hole, one end of the telescopic rod (27) is located in the inner cavity (26) and is in sliding connection with the inner cavity (26), the other end of the telescopic rod (27) extends into the through hole, the second spring (28) is located in the inner cavity (26), one end of the second spring is fixed to the end face of the telescopic rod (27) located in the inner cavity (26), the other end of the second spring is fixedly connected with the bottom of the inner cavity (26), and after the telescopic rod (27) and the side grooves (24) correspond one by, one part is contracted into the inner cavity (26), the telescopic rod (27) slides in the lateral groove (24), and when the telescopic rod (27) slides to the position of the groove (25), the telescopic rod (27) moves into the groove (25) under the action of the elastic force of the second spring (28).

3. The auxiliary device of the numbering machine as claimed in claim 2, wherein: the groove (25) is an arc-shaped groove, the contact position of the groove (25) and the bottom of the side groove (24) adopts arc transition, and the end face of the telescopic rod (27) in the through hole is a cone.

4. The auxiliary device of the numbering machine as claimed in claim 1, wherein: the driving part comprises a second motor (9), a driving shaft (10), a first gear (20) and a second gear (21), a driving groove (19) is formed in the moving block (4), the driving shaft (10) is located in the bottom plate (1) and is rotatably connected with the bottom plate (1), one end of the bottom plate (1) extends to the outside of the bottom plate (1), the driving shaft (10) penetrates through the driving groove (19), the driving shaft (10) in the driving groove (19) on the outlet side of the numbering tube machine (2) is in key connection with the first gear (20), the driving shaft (10) in the driving groove (19) on the inlet side of the numbering tube machine (2) is in key connection with the second gear (21), the bottom plate (1) is fixed by the second motor (9), the output shaft of the second motor (9) is connected with the driving shaft (10) through a coupler, and the first gear (20) is in direct engagement with a first straight gear rack arranged in the corresponding driving groove (19), the second gear (21) is meshed with a second spur rack arranged in a corresponding driving groove (19), and when the second motor (9) is started, the moving directions of the two moving blocks (4) are opposite.

5. The auxiliary device of the numbering machine as claimed in claim 1, wherein: the motor comprises a rectangular block (23), wherein the rectangular block (23) is fixed on the end face, facing the first motor (7), of the main shaft (5), a rectangular groove (22) matched with the rectangular block (23) is formed in an output shaft of the first motor (7), and when the main shaft (5) is placed in the shaft groove (11), the rectangular block (23) is combined with the rectangular groove (22).