Tank rotating mechanism of fire extinguisher

Abstract

The utility model provides a fire extinguisher tank rotating mechanism. The fire extinguisher tank rotating mechanism comprises a rack, a supporting disc, a driving column, a pressing assembly and a driving mechanism. The outer wall of the driving column can abut against the outer wall of the tank body on the supporting disc. And the pressing and leaning assembly is opposite to the driving column and used for pressing and leaning the tank body on the supporting disc to the driving column from the side face, and the driving mechanism is used for driving the driving column to rotate so as to drive the tank body on the supporting disc to rotate. The tank body is placed on the supporting disc, the pressing assembly pushes the tank body towards the driving column, the pressing assembly and the driving column are located on the two sides of the tank body respectively and abut against the tank body at the same time, and therefore the tank body and the supporting disc are coaxial, and filling of dry powder is facilitated; after dry powder filling is completed, the handle is slightly screwed at the opening of the tank body and held, then the driving mechanism drives the driving column to rotate so as to drive the tank body to rotate, then the rotating tank body is rapidly connected with the handle, dry powder filling and handle assembling are integrated into one procedure, and therefore the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of assembly fixture, specifically relates to a fire extinguisher tank rotating mechanism. BACKGROUND

[0002] The production of dry powder fire extinguisher will go through the processes of tank body forming, tank body paint spraying, tank body dry powder filling and handle assembly. The production of dry powder fire extinguisher usually adopts assembly line operation in the mode of manual and mechanical cooperation.

[0003] Tank body dry powder filling and handle assembly are two processes. When tank body dry powder filling, workers need to place the tank body on the positioning mechanism for fixation, and then use the filling machine to fill the dry powder, and then take down the filled tank body and transfer it to the next process. When handle assembly, workers need to assemble the handle first, and then screw it on the tank body by multiple times. In the above two processes, the efficiency is low, and how to integrate the two processes into one process to improve the efficiency is a problem to be solved. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model provides a fire extinguisher tank rotating mechanism, so that one or more of the above problems and other problems in the prior art can be solved or at least alleviated.

[0005] The utility model provides a fire extinguisher tank rotating mechanism, comprising:

[0006] A rack;

[0007] A support disc is arranged on the rack and used for supporting the tank body;

[0008] A driving column is rotatably arranged on the rack, the axis of the driving column is parallel to the axis of the support disc, and the outer wall of the driving column can abut against the outer wall of the tank body on the support disc;

[0009] A pressing assembly is opposite to the driving column, used for pressing the tank body on the support disc against the driving column from the side, cooperating with the driving column to make the tank body keep coaxial with the support disc, and the rolling frictional contact between the pressing assembly and the tank body on the support disc; and

[0010] A driving mechanism is used for driving the driving column to rotate to drive the tank body on the support disc to rotate.

[0011] Preferably, the support disc is vertically movable; the rack comprises:

[0012] A table top;

[0013] A stopper is arranged on the table top, and the surface facing the support disc is an arc surface; and

[0014] An arc-shaped baffle is arranged on the table top, and an arc surface is arranged on the side of the arc-shaped baffle facing the support disc; the arc-shaped baffle and the stopper are arranged on two sides of the support disc, respectively.

[0015] A cylindrical space is formed between the arc-shaped baffle and the stopper; the pressing assembly is close to or away from the tank on the support disc through the vertical movement of the support disc.

[0016] Preferably, a plurality of vertical first guide holes are arranged on the table top; a vertical accommodation window is arranged on the arc-shaped baffle.

[0017] The fire extinguisher tank rotating mechanism further comprises:

[0018] A support plate is arranged between the stopper and the arc-shaped baffle, and the lower end of the support plate is rotatably connected to the support disc; the other end of the support plate is rotatably connected to the lower end of the driving column through the accommodation window.

[0019] A plurality of first guide rods are arranged, and the upper end of each first guide rod is connected to the lower end of the support plate; the lower end of each first guide rod is slidably inserted into the corresponding first guide hole.

[0020] A plurality of first springs are arranged, and each first spring is sleeved outside the corresponding first guide rod; the two ends of each first spring are respectively abutted against the support plate and the table top.

[0021] Preferably, the pressing assembly comprises:

[0022] A sliding seat is fixedly connected to the upper end of the stopper; a pulley is connected to the upper side of the end of the sliding seat close to the support disc; and a second guide rod is connected to the end of the sliding seat away from the support disc.

[0023] A sliding block is arranged, and a sliding groove is arranged in the sliding block along the length direction of the sliding block; the sliding block is slidably connected to the sliding seat through the sliding groove.

[0024] A cover plate is connected to the end of the sliding block away from the support disc; a second guide hole is arranged in the cover plate, and the second guide hole is slidably connected to the second guide rod.

[0025] A second spring is sleeved on the second guide rod; the two ends of the second spring are respectively abutted against the cover plate and the sliding seat.

[0026] A connecting rope is connected to the end of the sliding block close to the support disc; the other end of the connecting rope is connected to the support plate after passing through the pulley.

[0027] Roller, provided with two, rotatingly connected with the slider, two the roller can be close to and abut on the jar body outer wall on the support disc, two the roller is located on the drive column and the slider connecting line both sides.

[0028] Preferably, the drive column is provided with coaxial weight-reducing holes; the table top is provided with a let-hole;

[0029] The drive mechanism comprises:

[0030] The matching pipe is located in the weight-reducing hole and connected with the inner wall of the weight-reducing hole, and the matching pipe is coaxial with the weight-reducing hole.

[0031] The motor is arranged below the table top; and

[0032] The drive rod is connected with the output end of the motor at one end and inserted into the matching pipe after passing through the let-hole, and the drive rod is slidingly matched with the matching pipe along the central line direction of the matching pipe.

[0033] Preferably, the drive column comprises:

[0034] The column body is provided with a plurality of annular mounting grooves on the outer wall; and

[0035] The rubber ring is provided with a plurality of rubber rings, each of which is sleeved in the corresponding mounting groove.

[0036] Preferably, the roller is provided with a plurality of annular force-reducing grooves.

[0037] Preferably, the support disc is provided with a plurality of limiting grooves; each of the limiting grooves is provided with a rollable ball; and the ball can support the jar body.

[0038] Compared with the prior art, the utility model has the following beneficial effects:

[0039] In the utility model technology, the jar body is placed on the support disc, the pressing assembly pushes the jar body to the direction of the drive column, the pressing assembly and the drive column are located on both sides of the jar body and abut against the jar body at the same time, so that the jar body is coaxial with the support disc; after the dry powder is filled, the handle is slightly screwed on the jar body opening and held, and then the drive mechanism drives the drive column to rotate, so as to drive the jar body to rotate, and then the rotating jar body is quickly connected with the handle, so that the dry powder filling and the handle assembly are integrated into one process, thereby improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings required to be used in the description of the specific embodiments or the prior art will be briefly introduced. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0041] Figure 1 It is a perspective view of a fire extinguisher rotating mechanism according to an embodiment of the present application;

[0042] Figure 2 It is a perspective view of a fire extinguisher rotating mechanism according to an embodiment of the present application; Figure 1 It is another perspective view (without the tank body) of the fire extinguisher rotating mechanism according to an embodiment of the present application;

[0043] Figure 3 It is another perspective view (bottom view) of the fire extinguisher rotating mechanism according to an embodiment of the present application. Figure 2

[0044] Reference signs:

[0045] 10, rack; 11, table top; 12, stop block; 13, arc-shaped baffle; 14, first guide hole; 15, make room window; 16, make room hole;

[0046] 20, support disc; 21, limiting groove; 22, ball bearing.

[0047] 30, driving column; 31, weight-reducing hole; 32, column body; 33, mounting groove; 34, rubber ring;

[0048] 40, pressing assembly; 41, sliding seat; 42, sliding block; 43, cover plate; 44, second spring; 45, connecting rope; 46, roller; 47, force-reducing groove; 48, second guide hole;

[0049] 50, driving mechanism; 51, matching pipe; 52, motor; 53, driving rod;

[0050] 60, support plate; 61, first guide rod; 62, first spring. DETAILED DESCRIPTION

[0051] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0052] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the technical personnel in the field to which the present application belongs.

[0053] ​In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0054] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0055] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0057] Referring to Figures 1 to 3 The present embodiment provides a fire extinguisher tank rotating mechanism, which comprises a rack 10, a supporting disc 20, a driving column 30, a pressing assembly 40 and a driving mechanism 50.

[0058] The supporting disc 20 is arranged on the rack 10, and the supporting disc 20 is used for supporting the tank body.

[0059] The driving column 30 is rotatably arranged on the frame 10, and the axis of the driving column 30 is parallel to the axis of the supporting disc 20. The outer wall of the driving column 30 can abut against the outer wall of the can on the supporting disc 20.

[0060] The pressing assembly 40 is opposite to the driving column 30, and the pressing assembly 40 is used to press the can on the supporting disc 20 against the driving column 30 from the side. The pressing assembly 40 cooperates with the driving column 30 to make the can and the supporting disc 20 coaxial, and the rolling frictional contact is formed between the pressing assembly 40 and the can on the supporting disc 20. The driving mechanism 50 is used to drive the driving column 30 to rotate to drive the can on the supporting disc 20 to rotate.

[0061] In the embodiment, the output pipe of the filling machine is coaxial with the supporting disc 20 and is located directly above the supporting disc 20 to fill the can with dry powder. The can is placed on the supporting disc 20, and the pressing assembly 40 pushes the can towards the driving column 30. The pressing assembly 40 and the driving column 30 are located on the two sides of the can and abut against the can respectively, so that the can is coaxial with the supporting disc 20. After the dry powder is filled, the handle is slightly screwed on the mouth of the can and held, and then the driving mechanism 50 drives the driving column 30 to rotate, thereby driving the can to rotate, and the rotating can is quickly connected with the handle. The dry powder filling and the handle assembly are integrated into one process, thereby improving the production efficiency. In addition, the handle only needs to be slightly screwed on the mouth of the can, and then the handle can be tightened with the can through the rotation of the can, thereby avoiding the workers from screwing multiple times and reducing the labor intensity of the workers.

[0062] In one embodiment, the supporting disc 20 is vertically movable. The frame 10 includes a table top 11, a stopper 12 and an arc-shaped baffle 13.

[0063] The stopper 12 is arranged on the table top 11, and the surface facing the supporting disc 20 is arc-shaped. The arc-shaped baffle 13 is arranged on the table top 11, and the surface facing the supporting disc 20 is arc-shaped. The arc-shaped baffle 13 and the stopper 12 are located on the two sides of the supporting disc 20 respectively. A cylindrical space is formed between the arc-shaped baffle 13 and the stopper 12, and the supporting disc 20 is located in the cylindrical space. The pressing assembly 40 approaches or moves away from the can on the supporting disc 20 by virtue of the vertical movement of the supporting disc 20.

[0064] In the embodiment, when the lower end of the can is placed on the supporting disc 20, the supporting disc 20 is lowered, and the outer periphery of the can is limited by the arc-shaped baffle 13 and the stopper 12, so that the can cannot be tilted.

[0065] In one embodiment, a plurality of vertical first guide holes 14 are formed in the table top 11, and a vertical accommodation window 15 is formed in the arc-shaped baffle 13.

[0066] The fire extinguisher rotating mechanism further comprises a support plate 60, a first guide rod 61 and a first spring 62.

[0067] One end of the support plate 60 is rotationally connected to the lower end of the support disc 20 between the stop block 12 and the arc-shaped baffle 13, and the other end is rotationally connected to the lower end of the driving column 30 through the gap window 15. Specifically, the other end of the support plate 60 is connected to a bearing which is coaxially sleeved on the outer lower end of the driving column 30. The first guide rod 61 is provided with a plurality of upper ends connected to the lower end of the support plate 60 and a plurality of lower ends slidingly inserted into the corresponding first guide holes 14. The first spring 62 is provided with a plurality of outer sleeves corresponding to the first guide rod 61, and the two ends of the first spring 62 are respectively abutted against the support plate 60 and the table top 11.

[0068] In this embodiment, the tank is placed on the support disc 20, the support disc 20 is compressed by the support plate 60 moving downward, and the first spring 62 is compressed at this time. At this time, the tank gradually penetrates between the arc-shaped baffle 13 and the stop block 12, and the tank will not be tilted when the tank is pressed against the tank by the pressing assembly 40 and the tank is pushed. When the pressing assembly 40 and the driving column 30 are in contact with the tank from both sides, the driving column 30 rotates, and the tank is rotated by the friction force of the surface of the driving column 30, and the support disc 20 below the tank can be rotated in cooperation.

[0069] In one embodiment, the pressing assembly 40 comprises a sliding seat 41, a sliding block 42, a cover plate 43, a second spring 44, a connecting rope 45 and a roller 46.

[0070] The sliding seat 41 is fixedly connected to the upper end of the stop block 12, and the upper side of the end of the sliding seat 41 close to the support disc 20 is connected with a pulley, and the end of the sliding seat 41 away from the support disc 20 is connected with a second guide rod. The lower end of the sliding block 42 is provided with a sliding groove along the length direction, and the sliding block 42 is slidingly matched with the sliding seat 41 through the sliding groove.

[0071] The cover plate 43 is connected to the end of the sliding block 42 away from the support disc 20, and the cover plate 43 is provided with a second guide hole 48 which is slidingly matched with the second guide rod. The second spring 44 is sleeved on the second guide rod, and the two ends of the second spring 44 are respectively abutted against the cover plate 43 and the sliding seat 41. One end of the connecting rope 45 is connected to the end of the sliding block 42 close to the support disc 20, and the other end of the connecting rope 45 is connected to the support plate 60 after passing through the pulley. The roller 46 is provided with two rollers 46 which are rotationally connected to the sliding block 42, and the two rollers 46 can be close to and abutted against the outer wall of the tank on the support disc 20, and the two rollers 46 are located on both sides of the line connecting the driving column 30 and the sliding block 42. Specifically, the roller 46 can be made of rubber.

[0072] In the embodiment, the tank is placed on the support disc 20, the tank presses the support disc 20 downwards, so that the support plate 60 moves downwards, and then the connecting rope 45 pulls the sliding block 42 to move close to the tank, and then the two rollers 46 push the tank and press it against the driving column 30, so that the tank is coaxial with the support disc 20, and the upper filling machine can fill the dry powder conveniently. The driving column 30 rotates to drive the tank and the support disc 20 to rotate, and the two rollers 46 rotate in cooperation.

[0073] In one embodiment, the driving column 30 is provided with a coaxial weight-reducing hole 31, and the table top 11 is provided with a let-in hole 16.

[0074] The driving mechanism 50 comprises a matching pipe 51, a motor 52 and a driving rod 53.

[0075] The matching pipe 51 is located in the weight-reducing hole 31, and the matching pipe 51 is connected to the inner wall of the weight-reducing hole 31 through a connecting piece, and the matching pipe 51 is coaxial with the weight-reducing hole 31. The motor 52 is arranged below the table top 11. One end of the driving rod 53 is connected to the output end of the motor 52, and the other end of the driving rod 53 is inserted into the matching pipe 51 after passing through the let-in hole 16, and the driving rod 53 is slidingly matched with the matching pipe 51 along the central line direction of the matching pipe 51. Specifically, the driving rod 53 is a square rod, and the cross section of the internal cavity of the matching pipe 51 is square. The end of the driving rod 53 away from the motor 52 is rotatably connected to the upper end of the arc-shaped baffle 13.

[0076] In the embodiment, the motor 52 drives the driving rod 53 to rotate, so as to drive the driving column 30 to rotate through the matching pipe 51, and the support plate 60 is lifted and lowered, and the matching pipe 51 can be lifted and lowered synchronously on the driving rod 53.

[0077] In one embodiment, the driving column 30 comprises a column body 32 and a rubber ring 34.

[0078] The weight-reducing hole 31 is arranged in the main body. The column body 32 is provided with a plurality of annular mounting grooves 33 on the outer wall. The rubber ring 34 is provided with a plurality of rubber rings, and each rubber ring 34 is sleeved in the corresponding mounting groove 33.

[0079] In the embodiment, the rubber ring 34 is arranged on the outer wall of the driving column 30, so that the column body 32 rotates to drive the tank to rotate through the friction between the rubber ring 34 and the outer wall of the tank.

[0080] In one embodiment, a plurality of annular force-reducing grooves 47 are arranged on the roller 46, so as to reduce the contact area between the roller 46 and the tank, and then the rotating resistance of the tank when the driving column 30 rotates is smaller.

[0081] In one embodiment, the support disc 20 is provided with a plurality of limiting grooves 21, each limiting groove 21 is provided with a rollable ball 22, and the ball 22 can support the tank.

[0082] In this embodiment, the tank is placed on the ball 22 on the support disc 20, when the slider 42 slides, the two rollers 46 press against the outer tank, pushing the tank to the driving column 30, and because of the support of the ball 22, the tank moves transversely more smoothly.

[0083] In the description of the present application, a large number of specific details are explained. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present description.

[0084] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and description of the present application.

Claims

1. A fire extinguisher change can mechanism characterized by, The fire extinguisher rotating mechanism comprises a rack (10), a supporting disc (20) arranged on the rack (10) and used for supporting a can body, a driving column (30) arranged on the rack (10) in a rotating mode, an axis of the driving column (30) being parallel to an axis of the supporting disc (20), and an outer wall of the driving column (30) being capable of abutting against an outer wall of the can body on the supporting disc (20), a pressing assembly (40) arranged opposite to the driving column (30) and used for pressing the can body on the supporting disc (20) against the driving column (30) from a side, and the pressing assembly (40) and the can body on the supporting disc (20) being in rolling frictional contact, and a driving mechanism (50) used for driving the driving column (30) to rotate so as to drive the can body on the supporting disc (20) to rotate. The supporting disc (20) is vertically movable, and the rack (10) comprises a table top (11), a stop block (12) arranged on the table top (11) and having an arc-shaped surface facing the supporting disc (20), and an arc-shaped baffle (13) arranged on the table top (11) and having an arc-shaped surface facing the supporting disc (20), the arc-shaped baffle (13) and the stop block (12) being respectively arranged on two sides of the supporting disc (20). A cylindrical space is formed between the arc-shaped baffle (13) and the stop block (12), and the pressing assembly (40) is close to or away from the can body on the supporting disc (20) by virtue of the vertical movement of the supporting disc (20). A plurality of vertical first guide holes (14) are formed in the table top (11), and an accommodation window (15) is formed in the arc-shaped baffle (13) in a vertical direction. The fire extinguisher rotating mechanism further comprises a supporting plate (60) having one end rotatably connected to a lower end of the supporting disc (20) and located between the stop block (12) and the arc-shaped baffle (13) and the other end rotatably connected to a lower end of the driving column (30) and penetrating through the accommodation window (15), a plurality of first guide rods (61) having upper ends connected to a lower end of the supporting plate (60) and lower ends slidably inserted into corresponding first guide holes (14), and a plurality of first springs (62) correspondingly sleeved on the first guide rods (61) and abutting against the supporting plate (60) and the table top (11) at two ends thereof. The pressing assembly (40) comprises a sliding seat (41) fixedly connected to an upper end of the stop block (12), a pulley connected to an upper side of one end of the sliding seat (41) close to the supporting disc (20), and a second guide rod connected to one end of the sliding seat (41) away from the supporting disc (20), and a sliding block (42) having a sliding groove formed in a lower end thereof in a length direction of the sliding block (42) and slidably matched with the sliding seat (41). ​ 2. A mechanism for turning over a canister of a fire extinguisher as defined in claim 1, characterized in that ​ ​ ​ ​ ​ 3. A mechanism for turning over a canister of a fire extinguisher as defined in claim 2, wherein ​ ​ ​ ​ ​ 4. A mechanism for turning over a canister of a fire extinguisher as defined in claim 3, wherein ​ ​ ​ A cover plate (43) is connected to the end of the sliding block (42) away from the support disc (20), and a second guide hole (48) is formed in the cover plate (43) and in sliding fit with the second guide rod; A second spring (44) is sleeved on the second guide rod, and the two ends of the second spring (44) are respectively in abutment with the cover plate (43) and the sliding seat (41); A connecting rope (45) is connected at one end to the end of the sliding block (42) close to the support disc (20) and connected at the other end to the support plate (60) after winding around the pulley; and Two rollers (46) are rotationally connected to the sliding block (42), and the two rollers (46) can be close to and abut against the outer wall of the tank on the support disc (20) along with the sliding block (42), and the two rollers (46) are located on the two sides of the line connecting the driving column (30) and the sliding block (42).

5. A mechanism for turning over a canister of a fire extinguisher as defined in claim 4, wherein A weight-reducing hole (31) coaxial with the driving column (30) is formed in the driving column (30); and a let-in hole (16) is formed in the table top (11); The driving mechanism (50) comprises: A matching tube (51) is located in the weight-reducing hole (31) and connected to the inner wall of the weight-reducing hole (31), and the matching tube (51) is coaxial with the weight-reducing hole (31); A motor (52) is arranged below the table top (11); and A driving rod (53) is connected at one end to the output end of the motor (52) and inserted into the matching tube (51) after passing through the let-in hole (16), and the driving rod (53) is in sliding fit with the matching tube (51) along the central line direction thereof.

6. A fire extinguisher change can mechanism as defined in claim 5, wherein, The driving column (30) comprises: A column body (32) having a plurality of annular mounting grooves (33) formed in the outer wall thereof; and A plurality of rubber rings (34) are arranged, and each rubber ring (34) is sleeved in the corresponding mounting groove (33).

7. A fire extinguisher change can mechanism as defined in claim 6, wherein, A plurality of annular force-reducing grooves (47) are formed in the roller (46).

8. A mechanism for turning over a canister of a fire extinguisher as defined in claim 7, wherein A plurality of limiting grooves (21) are formed in the support disc (20); a rollable ball (22) is arranged in each limiting groove (21); and the ball (22) can support the tank.

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