An aluminum profile anodic oxidation production wastewater treatment device

Abstract

The present invention relates to a device for treating wastewater from the anodic oxidation production of aluminum profiles, comprising: a frame, on which a storage barrel is arranged. The top end of the storage barrel is provided with a liquid inlet pipe, and a first solenoid valve is arranged on the liquid inlet pipe and inside the storage barrel. Inside the storage barrel and below the liquid inlet pipe, a receiving tray is arranged. Below the receiving tray, a connecting seat is arranged. On the top end surface of the connecting seat and inside the bottom end surface of the receiving tray, a collection groove is arranged; when treating wastewater, it will not cause a large amount of wastewater to accumulate on the filter screen, and the filtration speed and quality of the wastewater can be improved. It can reduce the solid impurities after filtration from interfering with the quality and efficiency of the subsequent wastewater filtration; the solid impurities after filtration can be promptly removed from the filter screen without accumulating on the filter screen, and the filtration effect of the filter screen next time can be maintained; it can ensure that the wastewater is fully and efficiently filtered.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and specifically refers to a wastewater treatment device for aluminum profile anodizing production. Background Art

[0002] Aluminum profile anodizing production forms an alumina film on the aluminum surface through electrochemical treatment, and this process is widely used in fields such as construction, automotive, electronics, and household. During the aluminum profile anodizing production process, wastewater is generated, and the wastewater contains solid impurities. Therefore, a wastewater treatment device for aluminum profile anodizing production is used to filter the wastewater.

[0003] However, the current wastewater treatment device for aluminum profile anodizing production will cause a large amount of wastewater to accumulate on the filter screen during wastewater treatment, and the filtration speed and quality of the wastewater cannot be improved. It is impossible to reduce the solid impurities after filtration from interfering with the quality and efficiency of subsequent wastewater filtration; the solid impurities after filtration cannot be removed from the filter screen in time and do not accumulate on the filter screen, and it is impossible to maintain the filtration effect of the filter screen next time; it is impossible to ensure that the wastewater is filtered fully and efficiently.

[0004] Designing a wastewater treatment device for aluminum profile anodizing production to address the problems existing in the above-mentioned prior art is the purpose of the research of the present invention. Summary of the Invention

[0005] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a wastewater treatment device for aluminum profile anodizing production, which can effectively solve at least one of the problems existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is as follows:

[0007] A wastewater treatment device for aluminum profile anodizing production, comprising:

[0008] A frame, on which a storage bucket is provided. At the top of the storage bucket, a liquid inlet pipe is provided, and a first solenoid valve is provided on the liquid inlet pipe and inside the storage bucket. Inside the storage bucket and below the liquid inlet pipe, a receiving tray is provided. Below the receiving tray, a connecting seat is provided, and a collection groove is provided on the top surface of the connecting seat and inside the bottom surface of the receiving tray;

[0009] An annular filter screen, which is arranged between the top of the connecting seat and the top of the storage bucket;

[0010] Solid residue output member, the top end of the solid residue output member is arranged on the connecting seat and communicated with the collection tank, the bottom end of the solid residue output member penetrates through the storage barrel, a filtrate output member is arranged at the bottom end of the storage barrel, a rotation driving member is arranged between the connecting seat and the receiving tray, a lifting driving member is arranged between the connecting seat and the storage barrel. When the connecting seat is at the highest point, the width of the annular filter screen is greater than the distance between the top end of the connecting seat and the top end of the storage barrel;

[0011] The rotation driving member is used to drive the receiving tray to rotate when the receiving tray receives waste water, so that the waste water received by the receiving tray is centrifugally dispersed obliquely upward to the outer end of the annular filter screen;

[0012] The lifting driving member is used to drive the connecting seat to descend uniformly to a predetermined position when the receiving tray receives waste water, so that the inner end of the annular filter screen gradually descends until the cross section of the annular filter screen is in an inclined state;

[0013] The rotation driving member is used to gradually increase the rotation speed of the receiving tray during the uniform descent of the connecting seat, so as to keep the waste water centrifugally dispersed obliquely upward to the outer end of the annular filter screen during the gradual descent of the receiving tray.

[0014] Further, several centrifugal shaking sliding plates are arranged on the inner wall of the storage barrel and rotate around the axis of the storage barrel, and the centrifugal shaking sliding plates are connected with the inner wall of the storage barrel through a centrifugal shaking sliding driving member.

[0015] Further, the centrifugal shaking sliding driving member includes an adapter seat arranged on the inner wall of the storage barrel, and a first rotating motor is arranged between the adapter seat and the centrifugal shaking sliding plate.

[0016] Further, the annular filter screen is an annular polytetrafluoroethylene fiber filter screen.

[0017] Further, the solid residue output member includes a folding pipe, the top end of the folding pipe is arranged on the connecting seat and communicated with the collection tank, the bottom end of the folding pipe penetrates through the storage barrel, and a second solenoid valve is arranged on the folding pipe and outside the storage barrel.

[0018] Further, the filtrate output member includes an output pipe arranged at the bottom end of the storage barrel and communicated with the storage barrel, and a third solenoid valve is arranged on the output pipe and outside the storage barrel.

[0019] Further, the rotation driving member includes a connecting column, the bottom end of the connecting column is arranged on the connecting seat and located in the collection tank, the top end of the connecting column is located outside the collection tank, and a second rotating motor is arranged between the top end of the connecting column and the receiving tray.

[0020] Further, the lifting driving member includes a folding cover disposed between the storage barrel and the connecting seat. A support seat is provided on the storage barrel and within the folding cover, and a telescopic motor is provided between the support seat and the connecting seat.

[0021] Therefore, the present invention provides the following effects and / or advantages:

[0022] 1) The frame is used to carry components and place the wastewater treatment device stably on the ground. The liquid inlet pipe is used to connect with an external liquid pumping pump to transport wastewater into the storage barrel. The first solenoid valve is used to control the wastewater to output at a predetermined flow rate when the liquid inlet pipe transports wastewater into the storage barrel. The receiving tray is used to receive the wastewater when the first solenoid valve controls the wastewater to output at a predetermined flow rate.

[0023] The self-rotation driving member is used to drive the receiving tray to rotate self when the receiving tray receives the wastewater, so that the wastewater received by the receiving tray is centrifugally dispersed obliquely upward to the outer end of the annular filter screen, so that when the wastewater contacts the outer end of the annular filter screen, part of the wastewater is directly filtered, and the wastewater that is not directly filtered moves from the outer end of the annular filter screen to the inner end of the annular filter screen. The wastewater that is not directly filtered is gradually filtered during the movement from the outer end of the annular filter screen to the inner end of the annular filter screen. The filtered solid impurities slide and accumulate towards the inner end direction of the annular filter screen; when treating wastewater, it will not cause a large amount of wastewater to accumulate on the annular filter screen, and the filtering speed and quality of the wastewater can be improved, and it can reduce the quality and efficiency of the subsequent wastewater being filtered hindered by the filtered solid impurities.

[0024] The lifting driving member is used to drive the connecting seat to descend uniformly to a predetermined position when the receiving tray receives the wastewater, so that the inner end of the annular filter screen gradually descends until the cross-section of the annular filter screen is in an inclined state, so that the filtered solid impurities gradually slide towards the collection tank until they fall into the collection tank; the filtered solid impurities can be removed from the annular filter screen in time without accumulating on the annular filter screen, and the filtering effect of the annular filter screen next time can be maintained.

[0025] The self-rotation driving member is used to gradually increase the self-rotation speed of the receiving tray during the uniform descent of the connecting seat, so as to keep the wastewater centrifugally dispersed obliquely upward to the outer end of the annular filter screen during the gradual descent of the receiving tray, thereby extending the distance that the wastewater that is not directly filtered moves from the outer end of the annular filter screen to the inner end of the annular filter screen. Thus, the speed of the wastewater that is not directly filtered being gradually filtered during the movement from the outer end of the annular filter screen to the inner end of the annular filter screen is accelerated, and thus the effect of the wastewater that is not directly filtered being gradually filtered during the movement from the outer end of the annular filter screen to the inner end of the annular filter screen is ensured; during the gradual descent of the receiving tray, it is still ensured that the wastewater can be filtered fully and efficiently.

[0026] The first solenoid valve is used to stop the output of wastewater when the connecting seat descends at a constant speed to a vertical distance of a predetermined value from a predetermined position. The collection tank is used to collect solid impurities. The solid residue output part is used to discharge the solid impurities collected by the collection tank to the outside of the storage bucket. The filtrate output part is used to discharge the filtrate to the outside of the storage bucket.

[0027] In summary, when treating wastewater, it will not cause a large amount of wastewater to accumulate on the filter screen, and the filtration speed and quality of the wastewater can be improved. It can reduce the obstruction of the filtered solid impurities to the quality and efficiency of the subsequent wastewater filtration. The filtered solid impurities can be removed from the filter screen in time without accumulating on the filter screen, and the filtration effect of the filter screen next time can be maintained. It can ensure that the wastewater is filtered fully and efficiently.

[0028] 2) The separation and vibration slide plate is used to, after the connecting seat descends to a predetermined position at a constant speed, first abut against the annular filter screen with a first predetermined force and then reciprocally abut against the annular filter screen with a second predetermined force smaller than the first predetermined force under drive, so that the solid impurities that have not fallen into the collection tank are separated from the annular filter screen and the separated solid impurities slide into the collection tank due to the reciprocating vibration. The filtered solid impurities can be completely removed from the annular filter screen without adhering to the annular filter screen, ensuring the filtration effect of the annular filter screen next time. The separation and vibration slide plate driving part is used to drive the separation and vibration slide plate to act.

[0029] Other features and advantages of the present invention will be described in the subsequent description, and, in part, will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are realized and obtained by the structures specifically pointed out in the description and the drawings.

[0030] It should be understood that the above summary and the following detailed description of the present invention are exemplary and explanatory, and are intended to provide further explanation of the present invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0032] Figure 2 Corresponding to Figure 1 Enlarged view of part A.

[0033] Description of the reference numerals:

[0034] Frame 11, storage bucket 12, liquid inlet pipe 13, first solenoid valve 14, receiving tray 15, connecting seat 16, collection tank 17, annular filter screen 18, separation and vibration slide plate 19, connection seat 20, first rotating motor 21, folding pipe 22, second solenoid valve 23, output pipe 24, third solenoid valve 25, connecting column 26, second rotating motor 27, folding cover 28, support seat 29, telescopic motor 30. Detailed implementation mode

[0035] For the convenience of those skilled in the art to understand, the structure of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments:

[0036] Reference Figure 1-2 , a device for treating wastewater from anodic oxidation production of aluminum profiles, comprising:

[0037] A frame 11, on which a storage bucket 12 is provided. At the top of the storage bucket 12, a liquid inlet pipe 13 is provided. On the liquid inlet pipe 13 and inside the storage bucket 12, a first solenoid valve 14 is provided. Inside the storage bucket 12 and below the liquid inlet pipe 13, a receiving tray 15 is provided. Below the receiving tray 15, a connecting seat 16 is provided. On the top surface of the connecting seat 16 and inside the bottom end surface of the receiving tray 15, a collection groove 17 is provided;

[0038] An annular filter screen 18 is arranged between the top of the connecting seat 16 and the top of the storage bucket 12; the inner end of the annular filter screen 18 is arranged on the top of the connecting seat 16 and outside the collection groove 17, the outer end of the annular filter screen 18 is arranged on the inner wall of the storage bucket 12, and the outer end of the annular filter screen 18 is above the receiving tray 15;

[0039] A solid residue output member, the top of which is arranged on the connecting seat 16 and communicated with the collection groove 17, and the bottom end of the solid residue output member passes through the storage bucket 12. A filtrate output member is provided at the bottom end of the storage bucket 12. A self-rotation driving member is arranged between the connecting seat 16 and the receiving tray 15, and a lifting driving member is arranged between the connecting seat 16 and the storage bucket 12. When the connecting seat 16 is at the highest point, the width of the annular filter screen 18 is greater than the distance between the top of the connecting seat 16 and the top of the storage bucket 12;

[0040] The self-rotation driving member is used to drive the receiving tray 15 to rotate when the receiving tray 15 receives wastewater, so that the wastewater received by the receiving tray 15 is centrifugally dispersed obliquely upward to the outer end of the annular filter screen 18;

[0041] The lifting driving member is used to drive the connecting seat 16 to descend uniformly to a predetermined position when the receiving tray 15 receives wastewater, so that the inner end of the annular filter screen 18 gradually descends until the cross section of the annular filter screen 18 is in an inclined state;

[0042] The self-rotation driving member is used to gradually increase the rotation speed of the receiving tray 15 during the uniform descent of the connecting seat 16, so as to keep the wastewater centrifugally dispersed obliquely upward to the outer end of the annular filter screen 18 during the gradual descent of the receiving tray 15.

[0043] The frame 11 is used to carry components and place the wastewater treatment device stably on the ground. The liquid inlet pipe 13 is used to connect with an external liquid pumping pump to transport wastewater into the storage barrel 12. The first solenoid valve 14 is used to control the output of wastewater at a predetermined flow rate when the liquid inlet pipe 13 transports wastewater into the storage barrel 12. The receiving tray 15 is used to receive wastewater when the first solenoid valve 14 controls the output of wastewater at a predetermined flow rate.

[0044] The rotation driving part is used to drive the receiving tray 15 to rotate when the receiving tray 15 receives wastewater, so that the receiving tray 15 centrifugally disperses the received wastewater obliquely upward to the outer end of the annular filter screen 18, so that when the wastewater contacts the outer end of the annular filter screen 18, part of the wastewater is directly filtered, and the wastewater that is not directly filtered moves from the outer end of the annular filter screen 18 to the inner end of the annular filter screen 18. The wastewater that is not directly filtered is gradually filtered during the movement from the outer end of the annular filter screen 18 to the inner end of the annular filter screen 18. The filtered solid impurities slide and accumulate in the direction of the inner end of the annular filter screen 18; when treating wastewater, it will not cause a large amount of wastewater to accumulate on the annular filter screen 18, and the filtering speed and quality of the wastewater can be improved, and it can reduce the quality and efficiency of the subsequent wastewater filtration hindered by the filtered solid impurities.

[0045] The lifting driving part is used to drive the connecting seat 16 to descend uniformly to a predetermined position when the receiving tray 15 receives wastewater, so that the inner end of the annular filter screen 18 gradually descends until the cross-section of the annular filter screen 18 is in an inclined state; thus, the filtered solid impurities gradually slide towards the collection tank 17 until they fall into the collection tank 17; the filtered solid impurities can be removed from the annular filter screen 18 in time without accumulating on the annular filter screen 18, and the filtering effect of the annular filter screen 18 can be maintained next time.

[0046] The rotation driving part is used to gradually increase the rotation speed of the receiving tray 15 during the uniform descent of the connecting seat 16 to keep the wastewater centrifugally dispersed obliquely upward to the outer end of the annular filter screen 18 during the gradual descent of the receiving tray 15, so as to extend the distance that the wastewater that is not directly filtered moves from the outer end of the annular filter screen 18 to the inner end of the annular filter screen 18. Thereby accelerating the filtering speed of the wastewater that is not directly filtered during the movement from the outer end of the annular filter screen 18 to the inner end of the annular filter screen 18, and thereby ensuring the filtering effect of the wastewater that is not directly filtered during the movement from the outer end of the annular filter screen 18 to the inner end of the annular filter screen 18; during the gradual descent of the receiving tray 15, it still ensures that the wastewater can be filtered fully and efficiently.

[0047] The first solenoid valve 14 is used to stop the output of wastewater when the connecting seat 16 descends uniformly to a vertical distance from a predetermined position by a predetermined value. The collection tank 17 is used to collect solid impurities. The solid residue output member is used to discharge the solid impurities collected by the collection tank 17 to the outside of the storage barrel 12. The filtrate output member is used to discharge the filtrate to the outside of the storage barrel 12.

[0048] A plurality of separation and vibration sliding plates 19 are rotatably arranged on the inner wall of the storage barrel 12 around the axis of the storage barrel 12. The separation and vibration sliding plates 19 are connected to the inner wall of the storage barrel 12 through a separation and vibration sliding driving member.

[0049] The separation and vibration sliding plates 19 are used to first abut against the annular filter screen 18 with a first predetermined acting force and then reciprocally abut against the annular filter screen 18 with a second predetermined acting force smaller than the first predetermined acting force after the connecting seat 16 descends uniformly to a predetermined position, so that the solid impurities that do not fall into the collection tank 17 are separated from the annular filter screen 18 and the separated solid impurities slide into the collection tank 17 due to reciprocating vibration. The filtered solid impurities can be completely removed from the annular filter screen 18 without adhering to the annular filter screen 18, ensuring the filtering effect of the annular filter screen 18 next time. The separation and vibration sliding driving member is used to drive the separation and vibration sliding plates 19 to act.

[0050] The separation and vibration sliding driving member includes an adapter seat 20 arranged on the inner wall of the storage barrel 12. A first rotating motor 21 is arranged between the adapter seat 20 and the separation and vibration sliding plates 19.

[0051] The annular filter screen 18 is an annular polytetrafluoroethylene fiber filter screen.

[0052] The surface of polytetrafluoroethylene fiber is very smooth and hydrophobic, and impurities are not easily attached. It has high temperature resistance and chemical corrosion resistance.

[0053] The solid residue output member includes a folding tube 22. The top end of the folding tube 22 is arranged on the connecting seat 16 and is communicated with the collection tank 17. The bottom end of the folding tube 22 passes through the storage barrel 12. A second solenoid valve 23 is arranged on the folding tube 22 and outside the storage barrel 12.

[0054] The filtrate output member includes an output pipe 24 arranged at the bottom end of the storage barrel 12 and communicated with the storage barrel 12. A third solenoid valve 25 is arranged on the output pipe 24 and outside the storage barrel 12.

[0055] The rotation driving member includes a connecting column 26. The bottom end of the connecting column 26 is disposed on the connecting seat 16 and is located within the collection groove 17. The top end of the connecting column 26 is located outside the collection groove 17. A second rotating motor 27 is provided between the top end of the connecting column 26 and the receiving tray 15.

[0056] The lifting driving member includes a folding cover 28 disposed between the storage barrel 12 and the connecting seat 16. A support seat 29 is provided on the storage barrel 12 and within the folding cover 28. A telescopic motor 30 is provided between the support seat 29 and the connecting seat 16.

[0057] The folding cover 28 has the function of preventing liquid from entering the interior.

[0058] It should be noted that in the claims, any reference signs between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several devices, several of these devices can be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names.

[0059] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0060] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A wastewater treatment device for anodizing of aluminum profiles, characterized by: include: A frame (11), wherein a storage barrel (12) is arranged on the frame (11), a liquid inlet pipe (13) is arranged at the top end of the storage barrel (12), a first solenoid valve (14) is arranged on the liquid inlet pipe (13) and located inside the storage barrel (12), a receiving tray (15) is arranged inside the storage barrel (12) and located below the liquid inlet pipe (13), a connecting seat (16) is arranged below the receiving tray (15), and a collecting groove (17) is arranged on the top end surface of the connecting seat (16) and located inside the bottom end surface of the receiving tray (15); an annular filter screen (18), the annular filter screen (18) being arranged between the top end of the connecting seat (16) and the top end of the storage barrel (12); A solid slag output member, wherein the top end of the solid slag output member is arranged on the connecting seat (16) and is connected to the collecting tank (17), the bottom end of the solid slag output member passes through the storage barrel (12), and the bottom end of the storage barrel (12) is provided with a filtrate output member, a self-rotating driving member is arranged between the connecting seat (16) and the receiving plate (15), and a lifting driving member is arranged between the connecting seat (16) and the storage barrel (12), and when the connecting seat (16) is at the highest point, the width of the annular filter (18) is greater than the distance between the top end of the connecting seat (16) and the top end of the storage barrel (12); The self-rotating driving member is used to drive the receiving plate (15) to rotate when the receiving plate (15) receives wastewater, so that the receiving plate (15) centrifugally disperses the received wastewater obliquely upward to the outer end of the annular filter screen (18); The lifting drive member is used to drive the connecting seat (16) to descend to a predetermined position at a uniform speed when the receiving plate (15) receives wastewater, so that the inner end of the annular filter (18) gradually descends until the cross section of the annular filter (18) is in an inclined state; The self-rotating driving member is used to drive the self-rotating speed of the receiving plate (15) to gradually increase during the uniform descent of the connecting seat (16) so as to keep the wastewater centrifugally dispersed obliquely upward to the outer end of the annular filter (18) during the gradual descent of the receiving plate (15).

2. The aluminum profile anodizing production wastewater treatment device according to claim 1, characterized in that: A plurality of increasing / distracting shaking slide plates (19) are arranged on the inner wall of the storage barrel (12) and rotate around the axis of the storage barrel (12); the increasing / distracting shaking slide plates (19) are connected to the inner wall of the storage barrel (12) via an increasing / distracting shaking slide driving member.

3. The aluminum profile anodizing production wastewater treatment device according to claim 2, characterized in that: The increasing / disconnecting and shaking sliding drive member comprises a connection seat (20) arranged on the inner wall of the storage bucket (12); a first rotating motor (21) is arranged between the connection seat (20) and the increasing / disconnecting and shaking sliding plate (19).

4. The aluminum profile anodizing production wastewater treatment device according to claim 1, characterized in that: The annular filter screen (18) is an annular polytetrafluoroethylene fiber filter screen.

5. The aluminum profile anodizing production wastewater treatment device according to claim 1, characterized in that: The solid slag output component comprises a folding tube (22), the top end of the folding tube (22) is arranged on the connecting seat (16) and is connected to the collecting tank (17), the bottom end of the folding tube (22) passes through the storage barrel (12), and a second solenoid valve (23) is arranged on the folding tube (22) and outside the storage barrel (12).

6. The aluminum profile anodizing production wastewater treatment device according to claim 1, characterized in that: The filtrate output component comprises an output pipe (24) which is arranged at the bottom end of the storage barrel (12) and is connected to the storage barrel (12); a third solenoid valve (25) is arranged on the output pipe (24) and outside the storage barrel (12).

7. The aluminum profile anodizing production wastewater treatment device according to claim 1, characterized in that: The self-rotating driving member comprises a connecting column (26), the bottom end of the connecting column (26) is arranged on the connecting seat (16) and is located in the collecting tank (17), the top end of the connecting column (26) is located outside the collecting tank (17), and a second rotating motor (27) is arranged between the top end of the connecting column (26) and the receiving plate (15).

8. The aluminum profile anodizing production wastewater treatment device according to claim 1, characterized in that: The lifting drive member comprises a folding cover (28) which is arranged between the storage barrel (12) and the connecting seat (16); a supporting seat (29) is arranged on the storage barrel (12) and inside the folding cover (28); and a telescopic motor (30) is arranged between the supporting seat (29) and the connecting seat (16).

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