CN112756657B

CN112756657B - Dust removal type aluminum drilling equipment for hardware processing

Info

Publication number: CN112756657B
Application number: CN202110000147.0A
Authority: CN
Inventors: 郝伟
Original assignee: Jiangxi Punuode Aluminum Co ltd
Current assignee: Jiangxi punuode Aluminum Co.,Ltd.
Priority date: 2021-01-01
Filing date: 2021-01-01
Publication date: 2021-12-24
Anticipated expiration: 2041-01-01
Also published as: CN112756657A

Abstract

The invention discloses dust removal type aluminum drilling equipment for hardware processing, which comprises a processing table, wherein a support frame is fixedly arranged at the left part of the lower end and the right part of the lower end of the processing table, a sliding groove is formed in the front wall and the rear wall of an inner cavity of each support frame, a stabilizing device is arranged on the wall of each sliding groove, a water storage spraying device is arranged in the middle of the inner cavity of a U-shaped frame, a telescopic extrusion device is arranged in the middle of the upper end of the U-shaped frame, a drilling device is arranged in the middle of the lower end of the water storage spraying device, a workpiece is placed in the middle of the upper end of the processing table, a rotation guiding device is arranged in the inner cavity of the processing table, and a clamping device is arranged at the lower part of the front end and the lower part of the rear end of the U-shaped frame. According to the dust removal type aluminum drilling equipment for hardware processing, clear water is sprayed onto a workpiece through the spray head, so that a dust removal effect is achieved, and the environment is protected.

Description

Dust removal type aluminum drilling equipment for hardware processing

Technical Field

The invention relates to the field of hardware processing equipment, in particular to dust removal type aluminum material drilling equipment for hardware processing.

Background

Hardware: traditional hardware is also called small hardware. It refers to five metals of gold, silver, copper, iron and tin. Can be made into artworks such as knives and swords or metal devices through manual processing. The hardware in modern society is more extensive, for example hardware and tools, hardware spare part, daily hardware, building hardware and security articles for use etc.. Little five metals product is mostly not final consumer goods, need process the five metals usually for convenient to use, and current drilling equipment can produce a large amount of dust when using, the easy polluted environment, and the inconvenient clout of retrieving of drilling equipment has reduced the practicality simultaneously, and drilling equipment takes place to rock easily when using simultaneously, has reduced stability.

Disclosure of Invention

The invention mainly aims to provide dust removal type aluminum drilling equipment for hardware processing, which can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the technical scheme that:

a dedusting type aluminum material drilling device for hardware processing comprises a processing table, wherein a support frame is fixedly installed at the left part of the lower end and the right part of the lower end of the processing table, a sliding groove is formed in the front wall of the inner cavity and the rear wall of the inner cavity of each support frame, a stabilizing device is jointly arranged on the groove walls of the two sliding grooves, a through groove is formed in the bottom of the inner cavity of each support frame, a storage box is fixedly installed in the middle of the opposite surfaces of the two support frames, a support plate is fixedly installed at the upper parts of the front end and the rear end of the processing table, a U-shaped frame is fixedly installed in the middle of the upper ends of the two support plates, a water storage spraying device is arranged in the middle of the inner cavity of the U-shaped frame, a telescopic extrusion device is arranged in the middle of the upper end of the U-shaped frame, a drilling device is arranged in the middle of the lower end of the water storage spraying device, and a workpiece is placed in the middle of the upper end of the processing table, the inner cavity of the processing table is provided with a rotation guide device, and the lower part of the front end and the lower part of the rear end of the U-shaped frame are both provided with a clamping device.

Preferably, the securing device includes the threaded rod, the threaded rod runs through the cell wall top and the fixed mounting of front side spout has first positive and negative motor, the surface upper portion threaded connection of threaded rod has the slide, the upper end rear portion of slide alternates and is connected with the gag lever post, the upper end fixed mounting of slide has the balancing weight, the anterior and the equal fixed mounting of lower extreme rear portion of lower extreme of slide has the bracing piece, two the equal fixed mounting of lower extreme of bracing piece has a sucking disc, the threaded rod alternates to connect the cell wall at the spout with securing device and support frame swing joint.

Preferably, water storage sprinkler includes the water storage box, the equal fixed mounting in front end middle part and the rear end middle part of water storage box has a connecting block, a water inlet, two have all been seted up to the right-hand member upper portion and the right-hand member lower part of water storage box the equal swing joint in inner chamber of water inlet has a piston, the equal fixed mounting in lower extreme left part middle part and the lower extreme right part middle part of water storage box has a shower nozzle, the equal fixed mounting in left end upper portion and the right end upper portion middle part of water storage box has a siphunculus, two the equal fixed mounting in surface lower part of siphunculus has an outlet pipe, water storage box fixed connection is with water storage sprinkler and U-shaped frame fixed connection at the inner chamber of U-shaped frame.

Preferably, the telescopic extrusion device comprises a telescopic power machine and a telescopic rod, the telescopic rod is electrically connected to the output end of the telescopic power machine, an extrusion plate is fixedly mounted at the lower end of the telescopic rod, a movable column is fixedly mounted in the middle of the lower end of the extrusion plate, and the telescopic power machine is fixedly connected to the middle of the upper end of the U-shaped frame to fixedly connect the telescopic extrusion device and the U-shaped frame.

Preferably, drilling equipment includes the frame that returns the shape, the inner chamber bottom fixed mounting who returns the shape frame has the motor, the output fixed mounting of motor has first pivot, the lower extreme fixed mounting of first pivot has the drill bit, it will drilling equipment and water storage sprinkler fixed connection to return shape frame fixed connection at water storage sprinkler's lower extreme.

Preferably, the rotation guiding device comprises a second rotating shaft, a rotating plate is fixedly mounted in the middle of the outer surface of the second rotating shaft, a second rotating shaft penetrates through the middle side of the front wall of the inner cavity of the processing table and is fixedly provided with a second positive and negative motor, and the second rotating shaft is connected in a penetrating manner in the middle of the inner cavity of the processing table and is movably connected with the processing table.

Preferably, the clamping device comprises a limiting screw, a clamping plate is fixedly mounted at the rear end of the limiting screw, a nut is connected to the front portion of the outer surface of the limiting screw in a threaded manner, and the limiting screw is connected with the clamping device and the U-shaped frame in a movably connected manner at the lower portion of the front end and the lower portion of the rear end of the U-shaped frame in a penetrating manner.

Preferably, the clamping plate and the workpiece are on the same horizontal line.

Preferably, the through pipe and the water outlet pipe are communicated with an inner cavity of the water storage box, and the spray head is positioned above the workpiece.

Preferably, the extrusion plate is located in an inner cavity of the water storage spraying device, and the area size of the extrusion plate is matched with the size of the inner cavity of the water storage spraying device.

Preferably, the rotary guide device and the processing table are maintained in a parallel positional relationship.

Preferably, the drilling means is located above the workpiece, the workpiece and the rotation guide means being held in a parallel positional relationship.

Compared with the prior art, the invention has the following beneficial effects:

1. drive first pivot through the motor and rotate to conveniently carry out drilling operation to the work piece when driving the drill bit and rotating, the clear water of extrusion water storage box bottom portion when the stripper plate down moves simultaneously produces sufficient pressure and promotes clear water and spray the work piece through the shower nozzle on, the dust granule in drop of water and the air adsorbs each other and fuses, because the reason of drop of water self gravity sinks, thereby reaches the effect of dust fall, plays the guard action to the environment.

2. The clear water on water storage box upper portion is promoted in convenient extrusion when the stripper plate up moves, the clear water sprays the surface of rotor plate through siphunculus and outlet pipe, the clout on rotor plate surface receives the influence and the come-up of clear water this moment, the convenience is carried the clout and is removed, be in the tilt state when driving the rotor plate through the second pivot and rotate, the clout on the rotor plate receives the influence of slope gravity this moment and down slides and enter into the storage box and store to the convenience is retrieved the clout, the practicality has been improved.

3. The sucker is driven to move downwards through the sliding plate to contact the ground, the sucker is adsorbed on the ground by the aid of atmospheric pressure, the machining table is prevented from shaking, stability of drilling equipment is improved, and meanwhile the whole weight of the equipment is increased by the aid of the balancing weight, so that stability is improved.

Drawings

FIG. 1 is an overall structure diagram of a dust removal type aluminum drilling device for hardware processing according to the present invention;

FIG. 2 is an overall structure diagram of a stabilizing device of the dust removal type aluminum drilling equipment for hardware processing;

FIG. 3 is an overall structure diagram of a water storage spraying device of the dust removal type aluminum drilling equipment for hardware processing;

FIG. 4 is an overall structure diagram of a telescopic extrusion device of the dust removal type aluminum drilling equipment for hardware processing;

FIG. 5 is an overall structure diagram of a drilling device of the dust removal type aluminum drilling equipment for hardware processing;

FIG. 6 is an overall structure diagram of a rotation guide device of the dust removal type aluminum drilling equipment for hardware processing;

FIG. 7 is an overall structure diagram of a clamping device of the dust removal type aluminum drilling equipment for hardware processing.

In the figure: 1. a processing table; 2. a support frame; 3. a chute; 4. a securing device; 5. a through groove; 6. a storage box; 7. a support plate; 8. a U-shaped frame; 9. a water storage spraying device; 10. a telescopic extrusion device; 11. a drilling device; 12. a workpiece; 13. a rotation guide device; 14. a clamping device; 41. a threaded rod; 42. a first positive and negative motor; 43. a slide plate; 44. a limiting rod; 45. a balancing weight; 46. a support bar; 47. a suction cup; 91. a water storage box; 92. connecting blocks; 93. a water inlet; 94. a piston; 95. a spray head; 96. pipe passing; 97. a water outlet pipe; 101. a telescopic power machine; 102. a telescopic rod; 103. a pressing plate; 104. a movable post; 111. a shape-returning frame; 112. a motor; 113. a first rotating shaft; 114. a drill bit; 131. a second rotating shaft; 132. a rotating plate; 133. a second positive and negative motor; 141. a limit screw; 142. a chucking plate; 143. and a nut.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in figures 1-7, a dust removal type aluminum drilling device for hardware processing comprises a processing table 1, wherein a support frame 2 is fixedly arranged at the left part and the right part of the lower end of the processing table 1, a sliding chute 3 is respectively arranged at the front wall and the rear wall of an inner cavity of each support frame 2, the wall of each sliding chute 3 is jointly provided with a stabilizing device 4, the bottom of each inner cavity of each support frame 2 is provided with a through groove 5, the middle parts of the opposite surfaces of the two support frames 2 are respectively and fixedly provided with a storage box 6, the upper parts of the front end and the rear end of the processing table 1 are respectively and fixedly provided with a support plate 7, the middle parts of the upper ends of the two support plates 7 are jointly and fixedly provided with a U-shaped frame 8, a water storage spraying device 9 is arranged at the middle part of the inner cavity of the U-shaped frame 8, a telescopic extrusion device 10 is arranged at the middle part of the upper end of the U-shaped frame 8, and a drilling device 11 is arranged at the middle part of the lower end of the water storage spraying device 9, a workpiece 12 is placed in the middle of the upper end of the processing table 1, a rotation guide device 13 is arranged in the inner cavity of the processing table 1, and a clamping device 14 is arranged on the lower portion of the front end and the lower portion of the rear end of the U-shaped frame 8.

Securing device 4 includes threaded rod 41, threaded rod 41 runs through the cell wall top of front side spout 3 and fixed mounting has first positive and negative motor 42, threaded rod 41's surface upper portion threaded connection has slide 43, slide 43's upper end rear portion alternates and is connected with gag lever post 44, gag lever post 44 plays limiting displacement to slide 43, the stationarity of slide 43 when sliding from top to bottom has been improved, slide 43's upper end fixed mounting has balancing weight 45, be provided with balancing weight 45 increase equipment's whole weight and improve stability, slide 43's the anterior and the equal fixed mounting of lower extreme rear portion have bracing piece 46, the equal fixed mounting of lower extreme of two bracing pieces 46 has a sucking disc 47, sucking disc 47 adsorbs subaerial, prevent that processing platform 1 from taking place to rock, the stability of drilling equipment has been improved, threaded rod 41 alternates and connects securing

device

4 and 2 swing joint of support frame at the cell wall of spout 3.

The water storage spraying device 9 comprises a water storage box 91, a connecting block 92 is fixedly arranged in the middle of the front end and the middle of the rear end of the water storage box 91, a water inlet 93 is respectively arranged on the upper part of the right end and the lower part of the right end of the water storage box 91, a piston 94 is movably connected with the inner cavities of the two water inlets 93, a nozzle 95 is fixedly arranged on the left middle side of the lower end and the right middle side of the lower end of the water storage box 91, clean water is sprayed on a workpiece 12 through the nozzle 95, water drops and dust particles in the air are mutually adsorbed and fused, the water drops sink due to the gravity of the water drops, the effect of reducing dust is achieved, the environment is protected, a through pipe 96 is fixedly arranged on the upper part of the left end and the upper part of the right end of the water storage box 91, a water outlet pipe 97 is fixedly arranged on the lower parts of the outer surfaces of the two through pipes 96 and the water outlet pipe 97 is sprayed on the surface of the through pipe 132, the clout on rotor plate 132 surface receives the influence of clear water and the come-up this moment, conveniently carries the clout and removes, and water storage box 91 fixed connection is with water storage sprinkler 9 and U-shaped frame 8 fixed connection in the inner chamber of U-shaped frame 8.

The telescopic extrusion device 10 comprises a telescopic power machine 101 and a telescopic rod 102, the telescopic power machine 101 is a power machine which can enable the telescopic rod 102 to be in a telescopic and extending state, the telescopic rod 102 is electrically connected to the output end of the telescopic power machine 101, the telescopic rod 102 drives the extrusion plate 103 to move upwards when being shortened, clear water on the upper portion of the water storage box 91 is conveniently extruded and pushed, the extrusion plate 103 is fixedly installed at the lower end of the telescopic rod 102, the movable column 104 is fixedly installed in the middle of the lower end of the extrusion plate 103, and the telescopic power machine 101 is fixedly connected to the middle of the upper end of the U-shaped frame 8 to fixedly connect the telescopic extrusion device 10 with the U-shaped frame 8.

The drilling device 11 comprises a clip frame 111, a motor 112 is fixedly mounted at the bottom of an inner cavity of the clip frame 111, a first rotating shaft 113 is fixedly mounted at the output end of the motor 112, a drill 114 is fixedly mounted at the lower end of the first rotating shaft 113, and the clip frame 111 is fixedly connected at the lower end of the water storage spraying device 9 to fixedly connect the drilling device 11 and the water storage spraying device 9.

The rotation guiding device 13 comprises a second rotating shaft 131, a rotating plate 132 is fixedly mounted in the middle of the outer surface of the second rotating shaft 131, the rotating plate 132 is in an inclined state around the second rotating shaft 131, the excess material on the rotating plate 132 is influenced by inclined gravity and slides downwards to enter the storage box 6 for storage, so that the excess material is conveniently recovered, and the practicability is improved.

The clamping device 14 comprises a limiting screw rod 141, a clamping plate 142 is fixedly mounted at the rear end of the limiting screw rod 141, the clamping plate 142 performs clamping and fixing effects on the workpiece 12, a nut 143 is connected to the front portion of the outer surface of the limiting screw rod 141 in a threaded manner, and the limiting screw rod 141 is connected to the lower portion of the front end and the lower portion of the rear end of the U-shaped frame 8 in a penetrating manner to movably connect the clamping device 14 with the U-shaped frame 8.

The chucking plate 142 and the workpiece 12 are on the same horizontal line.

The through pipe 96 and the water outlet pipe 97 are both communicated with the inner cavity of the water storage box 91, and the spray head 95 is positioned above the workpiece 12.

The extrusion plate 103 is located in the inner cavity of the water storage spraying device 9, and the area size of the extrusion plate 103 is matched with the size of the inner cavity of the water storage spraying device 9.

The rotary guide 13 and the processing table 1 are kept in a parallel positional relationship.

The drilling device 11 is located above the workpiece 12, and the workpiece 12 and the rotation guide 13 are held in a parallel positional relationship.

It should be noted that, the invention is a dust removal type aluminum material drilling device for hardware processing, two sets of pistons 94 are opened, so that two sets of water inlets 93 are in an unblocked state, clean water enters the water storage box 91 through the water inlets 93 for storage, the clean water is located at the upper side and the lower side of the extrusion plate 103 at the moment, the telescopic rod 102 is driven to stretch through the telescopic power machine 101, so that the extrusion plate 103 and the movable column 104 are driven to move downwards when the telescopic rod 102 is extended, the drilling device 11 is driven to contact with the workpiece 12 when moving downwards, the first rotating shaft 113 is driven to rotate through the motor 112, so that the drilling operation on the workpiece 12 is facilitated when the drill 114 is driven to rotate, meanwhile, the clean water at the bottom of the water storage box 91 is extruded when the extrusion plate 103 moves downwards, enough pressure is generated to push the clean water to be sprayed onto the workpiece 12 through the spray nozzle 95, and dust particles in water beads and air are mutually adsorbed and fused, the water drops sink due to the gravity of the water drops, so that the dust falling effect is achieved, and the environment is protected; the telescopic power machine 101 is used for driving the telescopic rod 102 to stretch, so that when the telescopic rod 102 is shortened, the extrusion plate 103 is driven to move upwards, clean water on the upper part of the water storage box 91 is conveniently extruded and pushed, the clean water is sprayed to the surface of the rotating plate 132 through the through pipe 96 and the water outlet pipe 97, excess materials on the surface of the rotating plate 132 float upwards under the influence of the clean water, the excess materials are conveniently carried and moved, the second rotating shaft 131 is driven to rotate through the second positive and negative motor 133, the rotating plate 132 is driven to be in an inclined state around the second rotating shaft 131, and the excess materials on the rotating plate 132 slide downwards under the influence of inclined gravity and enter the storage box 6 for storage, so that the excess materials are conveniently recovered, and the practicability is improved; drive threaded rod 41 through first positive and negative motor 42 and rotate to drive slide 43 and slide down along threaded rod 41, and then make sucking disc 47 move down and contact ground when driving bracing piece 46 and move down, utilize atmospheric pressure to adsorb sucking disc 47 subaerial, prevent that processing platform 1 from taking place to rock, improved drilling equipment's stability, be provided with the whole weight that balancing weight 45 increases equipment simultaneously and improve stability.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a dust type aluminium material drilling equipment for hardware processing, includes processing platform (1), its characterized in that: the processing table is characterized in that a support frame (2) is fixedly mounted at the left part and the right part of the lower end of the processing table (1), a chute (3) is formed in the front wall and the rear wall of the inner cavity of each support frame (2), a stabilizing device (4) is arranged on the wall of each chute (3), a through groove (5) is formed in the bottom of the inner cavity of each support frame (2), a storage box (6) is fixedly mounted in the middle of the opposite surface of each support frame (2), a support plate (7) is fixedly mounted at the upper part of the front end and the upper part of the rear end of the processing table (1), a U-shaped frame (8) is fixedly mounted in the middle of the upper end of each support plate (7), a water storage spraying device (9) is arranged in the middle of the inner cavity of the U-shaped frame (8), and a telescopic extrusion device (10) is arranged in the middle of the upper end of the U-shaped frame (8), the water storage spraying device is characterized in that a drilling device (11) is arranged in the middle of the lower end of the water storage spraying device (9), a workpiece (12) is placed in the middle of the upper end of the processing table (1), a rotation guide device (13) is arranged in an inner cavity of the processing table (1), the lower portion of the front end and the lower portion of the rear end of the U-shaped frame (8) are respectively provided with a clamping device (14), the stabilizing device (4) comprises a threaded rod (41), the threaded rod (41) penetrates through the top of the groove wall of the front side sliding groove (3) and is fixedly provided with a first positive and negative motor (42), the upper portion of the outer surface of the threaded rod (41) is in threaded connection with a sliding plate (43), a limiting rod (44) is alternately connected to the rear portion of the upper end of the sliding plate (43), a balancing weight (45) is fixedly installed on the upper end of the sliding plate (43), and supporting rods (46) are fixedly installed on the front portion and the rear portion of the lower end of the sliding plate (43), the lower end of the two support rods (46) is fixedly provided with a sucker (47), the threaded rod (41) is connected with the groove wall of the sliding groove (3) in a penetrating manner to movably connect the fixing device (4) with the support frame (2), the water storage spraying device (9) comprises a water storage box (91), the middle part of the front end and the middle part of the rear end of the water storage box (91) are fixedly provided with a connecting block (92), the upper part of the right end and the lower part of the right end of the water storage box (91) are respectively provided with a water inlet (93), the inner cavities of the two water inlets (93) are movably connected with a piston (94), the middle part of the left end and the middle part of the right end of the water storage box (91) are respectively fixedly provided with a spray head (95), the upper part of the left end and the upper part of the right end are respectively fixedly provided with a through pipe (96), and the lower part of the through pipe (96) is fixedly provided with a water outlet pipe (97), the water storage box (91) is fixedly connected with an inner cavity of the U-shaped frame (8) to fixedly connect the water storage spraying device (9) with the U-shaped frame (8), the telescopic extrusion device (10) comprises a telescopic power machine (101) and a telescopic rod (102), the telescopic rod (102) is electrically connected with an output end of the telescopic power machine (101), the lower end of the telescopic rod (102) is fixedly provided with an extrusion plate (103), the middle part of the lower end of the extrusion plate (103) is fixedly provided with a movable column (104), the telescopic power machine (101) is fixedly connected with the middle part of the upper end of the U-shaped frame (8) to fixedly connect the telescopic extrusion device (10) with the U-shaped frame (8), the drilling device (11) comprises a shape returning frame (111), the bottom of the inner cavity of the shape returning frame (111) is fixedly provided with a motor (112), and the output end of the motor (112) is fixedly provided with a first rotating shaft (113), the drilling machine is characterized in that a drill bit (114) is fixedly mounted at the lower end of the first rotating shaft (113), the return frame (111) is fixedly connected to the lower end of the water storage spraying device (9) to fixedly connect the drilling device (11) and the water storage spraying device (9), the rotation guide device (13) comprises a second rotating shaft (131), a rotating plate (132) is fixedly mounted in the middle of the outer surface of the second rotating shaft (131), the second rotating shaft (131) penetrates through the middle side of the front wall of the inner cavity of the machining table (1) and is fixedly provided with a second positive and negative motor (133), the second rotating shaft (131) is connected to the middle of the inner cavity of the machining table (1) in a penetrating manner to movably connect the rotation guide device (13) and the machining table (1), the clamping device (14) comprises a limiting screw (141), a clamping plate (142) is fixedly mounted at the rear end of the limiting screw (141), and a nut (143) is connected to the front portion of the outer surface of the limiting screw (141), spacing screw (141) alternate connection is in the front end lower part and the rear end lower part of U-shaped frame (8) with chucking device (14) and U-shaped frame (8) swing joint, chucking board (142) and work piece (12) are in same water flat line, siphunculus (96) and outlet pipe (97) all are linked together with the inner chamber of water storage box (91), shower nozzle (95) are located the top of work piece (12), stripper plate (103) are located the inner chamber of water storage sprinkler (9), the area size of stripper plate (103) and the inner chamber size phase-match of water storage sprinkler (9), rotate guiding device (13) and processing platform (1) and keep the parallel position relation, drilling equipment (11) are located the top of work piece (12), work piece (12) and rotation guiding device (13) keep the parallel position relation.