CN113731603A

CN113731603A - Melon seed slice manufacturing method and device

Info

Publication number: CN113731603A
Application number: CN202111029997.XA
Authority: CN
Inventors: 何玉彬
Original assignee: Dongzhi Anton Garden Building Materials Co ltd
Current assignee: Dongzhi Anton Garden Building Materials Co ltd
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2021-12-03

Abstract

The invention discloses a melon seed slice manufacturing method and a device, the melon seed slice manufacturing method comprises three steps of sand-stone separation, cobblestone separation and crushing processing, the melon seed slice manufacturing device comprises a separator, the separator comprises a silt separation part and a broken stone separation part, the silt separation part comprises a cylinder and a spiral-shaped bent downward-extending material carrying plate, and the broken stone separation part comprises a grating and a box body which are driven by a crankshaft to alternately perform lifting forward movement and sinking backward movement. Aiming at the cobblestones containing silt generated in the river channel dredging project, the invention adopts the two-step separation separator to separate the silt and the cobblestones with different sizes respectively, thereby not only avoiding the problem of heavy sewage treatment caused by wet silt removal, but also completely separating the cobblestones with different sizes from the silt according to the sizes of the cobblestones and processing the cobblestones respectively, and being beneficial to improving the efficiency of manufacturing melon seed slices by the cobblestones.

Description

Melon seed slice manufacturing method and device

Technical Field

The invention belongs to the technical field of building material processing, and particularly relates to a method and a device for manufacturing melon seed slices.

Background

Melon seed slice, commonly known as "Qingshi seed" in construction. The green stone is crushed by a crusher, the green stone is known as the Qingshi, the melon seed slices are processed crushed stone slices with the particle size of 5-10mm, and the melon seed slices are commonly called as melon seed slices and are widely used in basic decoration engineering.

This company undertakes to build river course desilting project engineering, in order to realize the purpose of environmental protection and the purpose of resource utilization maximize, has opened up the processing lines of melon seed piece simultaneously, and this production line carries out the production of melon seed piece as the raw materials with the riverbed cobble of river course desilting. However, a large amount of silt can be carried in the riverbed cobblestones for dredging the riverway, and when the melon seed pieces wrapping the silt are combined with concrete, the concrete is not firmly combined, the quality of a building is affected, and therefore the silt carried in the melon seed pieces needs to be separated out in the processing and production process.

The inventor will review the data and verify that there are related patent publications. For example, as disclosed in 201910696912.X, a screening and crushing device for engineering stones is sequentially provided with a vibrating device, a material separating hopper and a crushing device, wherein a sand-stone mixture is automatically screened by the vibrating device and the material separating hopper, and then large stones are crushed into stones with qualified sizes by the crushing device. However, the vibrating device discharges sand, too small stones and stones with the size from the corresponding outlets in the material separating hopper 2 during screening, which obviously causes that when melon seeds are processed by riverbed cobblestones for dredging riverways, cobblestones with small sizes still mix with the sand and are not separated, and the cobblestones with small sizes need to be further crushed because the appearance characteristics do not conform to the melon seeds.

The integrated machine for cleaning and crushing the stones for the building with the application number of 202110073214.1 is disclosed, the stones can be processed into stones through a crushing mechanism, and the fine stones can be screened through a screening mechanism; the addition of the stones can be completed by clockwise rotation of the conveyer belt, so that the stones can be conveniently processed into stones; water is sprayed on the stones through the spray pipes, and the stones can be cleaned. The device adopts the wet method to remove silt, namely the silt is taken away by water flow through a spraying method, the technical means has the feasibility of being compared with stones carrying a small amount of silt, but for riverbed cobblestones for dredging the riverway, as the riverbed cobblestones for dredging the riverway contain a large amount of silt, a large amount of water resources can be wasted by adopting the means, and meanwhile, a sewage treatment system is required to be built with great investment to treat sewage for washing the silt, so that the feasibility is poor.

The application aims to provide a method and a device for manufacturing melon seed slices by treating cobblestones by a non-wet silt removal method, which are matched with the river channel dredging project.

Disclosure of Invention

The invention aims at the problems in the prior art and provides a method and a device for manufacturing melon seed slices.

The invention solves the technical problems through the following technical means:

the manufacturing method of the melon seed slices sequentially comprises the following steps:

step one, sand and stone separation: arranging a material carrying plate which is spirally bent and extended from top to bottom and a cylinder body which surrounds the outer part of the material carrying plate, throwing cobblestones containing silt from the upper part of the material carrying plate, cracking and stripping the silt blocks adhered to the surfaces of the cobblestones through collision in the sliding or rolling process of the cobblestones, crushing and separating the silt blocks in the further falling process of the cobblestones, and collecting the cobblestones at a discharge hole of the material carrying plate;

step two, cobblestone separation: the method comprises the steps that a crankshaft and a plurality of bars with one ends driven by the crankshaft and distributed at equal intervals are arranged, a support rod is arranged to support the other ends of the bars, collected cobblestones are thrown onto the bars from one end of the crankshaft, the crankshaft is controlled to rotate to drive adjacent bars to alternately perform lifting, advancing, sinking and retreating motions, large-size cobblestones slide out, small-size cobblestones fall down from gaps between the adjacent bars, and the large-size cobblestones and the small-size cobblestones are collected respectively;

step three, crushing processing: and respectively crushing and processing the large-size cobblestones and the small-size cobblestones to obtain the melon seed slices.

The present invention also provides a melon seed flake production apparatus for carrying out the above-described melon seed flake production method, the melon seed flake production apparatus including a separator, the separator including:

the silt separation part comprises a barrel and a material carrying plate fixed on the inner side wall of the barrel, the material carrying plate is spirally bent from the opening of the barrel and extends downwards to the outlet, and a dust exhaust hole is formed in the joint of the barrel and the material carrying plate;

the material inlet of the gravel separating part corresponds to the outlet of the sediment separating part, the gravel separating part comprises a box body and a grid, and the grid is transversely arranged in the box body to divide the box body into an upper area and a lower area; the grid includes bent axle and a plurality of equidistant strip poles that distribute, the one end of strip pole links to each other with the bent axle, and the other end passes through the bracing piece to be supported, the bracing piece sets up the discharge end at the grid, the bent axle sets up the feed end at the grid, and is adjacent the strip pole receives the bent axle drive to carry out the lifting in turn and advance, sink the backspacing.

Furthermore, a convex block with a sharp thorn part is arranged on the inner side wall of the cylinder body.

Further, the barrel comprises an inner wall and an outer wall, the inner wall is connected with the material carrying plate, and a dust collecting main cavity is formed between the inner wall and the outer wall.

Further, it includes plate body, lower plate body and curb plate to carry the flitch, be provided with the bar hole on the plate body, go up plate body and lower plate body one side and interior wall connection, the opposite side passes through curb plate sealing connection, it forms the vice chamber of collection dirt to go up between plate body and the lower plate body, the vice chamber of collection dirt communicates with collection dirt main cavity.

Furthermore, the tail end of the lower part of the material carrying plate is also provided with a transition plate, the transition plate and the material carrying plate are distributed in a step shape, a dust collecting gap is formed between the transition plate and the material carrying plate, an air feeder is arranged on the blanking side of the dust collecting gap, and the dust collecting gap is communicated with a dust collecting main cavity.

Furthermore, a rolling shaft sleeve is arranged on the supporting rod.

The invention has the beneficial effects that: aiming at the cobblestones containing silt generated in the river channel dredging project, the invention adopts the two-step separation separator to separate the silt and the cobblestones with different sizes respectively, thereby not only avoiding the problem of heavy sewage treatment caused by wet silt removal, but also completely separating the cobblestones with different sizes from the silt according to the sizes of the cobblestones and processing the cobblestones respectively, and being beneficial to improving the efficiency of manufacturing melon seed slices by the cobblestones.

Drawings

FIG. 1 is a schematic perspective view of a separator;

FIG. 2 is a schematic view of the connection and structure of the cylinder and the material carrying plate;

FIG. 3 is a schematic diagram of the distribution structure of the material carrying plate and the transition plate;

FIG. 4 is a schematic view of the structure of the grid;

FIG. 5 is a schematic view of the engagement of the bar with the support bar;

fig. 6 is a schematic view of the connection structure of the bar and the crankshaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

This embodiment provides a method for producing melon seed slices, which aims to provide a method for producing melon seed slices by removing silt from cobblestones by a non-wet method and then using the cobblestones further, wherein the method needs to be implemented by a separator 100.

The separator 100 has the following structural features:

as shown in fig. 1, the silt separation part 110 and the crushed stone separation part 120 are included, the silt separation part 110 and the crushed stone separation part 120 are tightly connected, the top of the silt separation part 110 is provided with an opening for feeding pebbles containing silt, the bottom of the silt separation part 110 is provided with an outlet for discharging the pebbles, the pebbles discharged from the bottom of the separation part 110 enter the crushed stone separation part 120, the pebbles pass through the crushed stone separation part 120 and are separated according to size difference, the pebbles with small size slide out from the lower part of the crushed stone separation part 120, and the pebbles with large size slide out from the upper part of the crushed stone separation part 120.

As shown in fig. 1 and 2, the sand-mud separating part 110 includes a cylinder 111 and a material-carrying plate 112, the material-carrying plate 112 is fixed on the inner sidewall of the cylinder 111, the material-carrying plate 112 is spirally bent and extends downwards from the opening at the top of the cylinder 111, the lower end of the material-carrying plate 112 is a discharge port, a dust-discharging hole 113 is opened at the joint of the cylinder 111 and the material-carrying plate 112, the pebbles are fed into the sand-mud separating part 110 from the top of the material-carrying plate 112, the pebbles slide down or roll down along the material-carrying plate 112 under the influence of gravity, because the pebbles have smooth surface characteristics, when moving on the material-carrying plate 112, they have sliding and rolling motion characteristics, and the material-carrying plate 112 is spirally bent under the restriction of the cylinder 111, the pebbles inevitably collide and rub against the inner sidewall of the cylinder 111 under the influence of centrifugal force during the movement, and the pebbles also rub and collide against each other during the movement, further, by means of the collision and the friction, the solidified silt blocks adhered to the cobblestones can be quickly loosened and cracked and stripped from the cobblestones in the continuous movement process; along with the subsequent cobblestones are fed into the moving process, the silt block stripped off by the cracking can be rolled, the silt block is accelerated to be decomposed into fine silt, and the fine silt formed by the decomposition can be discharged from the dust discharge hole 113. Through the structural design of the sediment separation part 110, the cobblestones with sediment generate spiral descending movement, and the promotion effect on the cracking, stripping and refining of sediment blocks is generated through the movement characteristics of the cobblestones with sediment, so that the cobblestones and the sediment are separated in the movement process.

As shown in fig. 2, a projection 114 with a spike is further disposed on the inner sidewall of the cylinder 111, and the projection 114 may be in a pyramid shape or a cone shape. The cobblestones can contact the cylinder 111 when sliding or rolling, the purpose of arranging the bump 114 can utilize the instant huge pressure of the contact between the thorn part and the cobblestones to break the silt blocks on the cobblestones, which greatly accelerates the promotion of cracking, stripping and refining of the silt blocks, on the one hand, the bump 114 is also used for destroying the smooth surface of the cylinder 111, thereby reducing the smooth feeling of the cobblestones in the downward movement process, that is, after the pebbles collide with the convex blocks 114, a gap is generated around the contact points of the pebbles and the convex blocks 114, so that the pebbles cannot smoothly and directly slide, but the cobblestone movement in this state has obvious setback feeling because of the deflection of a certain angle and the contact with the next bump 114, thereby being beneficial to improving the efficiency of removing silt because of increasing the friction and collision between cobblestones and bumps 114.

As shown in fig. 3, the lower end of the material carrying plate 112 is further provided with a transition plate 115, the transition plate 115 is arranged in a step shape with the material carrying plate 112, that is, the material loading plate 112 is higher than the transition plate 115, and the transition plate 115 is discontinuous with the material loading plate 112 in the extending direction of the material loading plate 112, a dust collecting gap 116 is formed between the transition plate 115 and the material loading plate 112, the blower 117, which may be a fan, is disposed at a side of the dust collecting gap 116, and for a small amount of silt particles that are not directly discharged from the dust discharge holes 113, the silt particles slide out from the end of the loading plate 112 together with the pebbles, because the mass of the silt block is far less than that of the cobblestones, and the resistance borne by the silt block when sliding down is far more than that of the cobblestones, the speed of sliding out of the material carrying plate 112 is extremely low, the air pressure of the blower 117 is applied to the dust collecting gap 116 to be collected, and the blower 117 does not interfere with the pebbles sliding into the transition plate 115 to be further introduced into the crushed stone separating part 120.

As shown in fig. 2, the barrel 111 has a double-layer structure, that is, the barrel includes an inner wall 1111 and an outer wall 1112, the inner wall 1111 is connected to the material loading plate 112, a dust collecting main cavity 118 is formed between the inner wall 1111 and the outer wall 1112, the material loading plate 112 also has a double-layer structure, the material loading plate 112 includes an upper plate body 1121 and a lower plate body 1122, one side of each of the upper plate body 1121 and the lower plate body 1122 is connected to the inner wall 1111, the other side of each of the upper plate body and the lower plate body is connected to the inner wall 1123 in a sealing manner, the side plate 1123 can also limit cobbles from falling from the material loading plate 112, a dust collecting sub-cavity 119 is formed between the upper plate body 1121 and the lower plate body 1122, the dust collecting sub-cavity 119 is communicated to the dust collecting main cavity 118, and the upper plate body 1121 is also provided with a strip-shaped hole 1124. Through this structure setting, in case produce the silt that can supply to collect, silt alright in order to fall into collection dirt main cavity 118 directly from dust exhaust hole 113, perhaps fall into collection dirt vice chamber 119 through the bar hole 1124 on the upper plate body 1121, fall into collection dirt main cavity 118 through collection dirt vice chamber 119 again, so not only be convenient for directly collect silt dust, can also avoid the silt of production to fly away in the air simultaneously, pollute operational environment.

The cobblestones after separating silt can slide into the broken stone separation part 120 through the transition plate 115, and because the cobblestones discharged by dredging the river channel have very large size difference, the size difference can reach dozens of centimeters even, and the size difference can be as small as one centimeter or two centimeters, the adjustment of crushing parameters during crushing processing of the melon seeds is obviously different, so that the cobblestones with different sizes are required to be further separated according to the size, and then are processed respectively.

As shown in fig. 1, the crushed stone separating portion 120 includes a box 121 and a grating 122, the box 121 is connected to the barrel 111, the grating 122 is transversely disposed in the box 121 to divide the box 121 into an upper region and a lower region, the cobblestones pass through the grating 122 to leak small cobblestones, the large cobblestones pass through the grating 122 to be collected or conveyed to the crushing device for processing, and the small cobblestones leaked through the grating 122 pass through the discharge port 123 to be collected or conveyed to the crushing device for processing.

As shown in fig. 4, the grid 122 includes a crankshaft 1221 and a plurality of bars 1222 distributed at equal intervals, one end of each bar 1222 is connected to the crankshaft 1221, the other end of each bar 1222 is supported by a support rod 1223, the support rod 1223 is disposed at the discharge end of the grid 122, the support rod 1223 can be directly welded to the box 121, the crankshaft 1221 is disposed at the feed end of the grid 122, the adjacent bars 1222 are in alternating wave-like fluctuation movement along with the rotation of the crankshaft 1221, that is, when in a horizontal state, the plurality of bars 1222 are on the same horizontal plane, and both ends of each bar 1222 are horizontal, as the crankshaft 1221 rotates, half of the bars 1222 are lifted along with the rotation of the crankshaft 1221 and move along with the forward movement to the vertex of the arc track of the rotation of the crankshaft 1221, and the other half of the bars 1222 are in opposite sinking and retracting movement until all the bars 1222 are on the same horizontal plane again, and the bar 1222 in lifting movement before is retracted, the bar 1222, which moves back, moves up, and so on in alternating cycles.

When the cobbles with different sizes fall on the grating 122, firstly the cobbles with the size obviously smaller than the interval between the bars 1222 are directly fallen and separated, and at this time, if the bars 1222 are in a horizontal state, the cobbles are still on the grating 122, as the crankshaft 1221 rotates, one end of a part of the bars 1222 close to the transition plate 115 starts to lift and advance, the part of the bars 1222 is in an inclined state, the cobbles slide or roll under the influence of gravity, and the part of the bars 1222 has advance while lifting, and also transports the cobbles forwards, in addition, the size of the cobbles is not completely larger or smaller than the interval between the gratings 122, the cobbles are clamped between the gratings 122, the part of the clamped cobbles block the screening channel, when the gratings 122 are driven by the crankshaft 1221 to move, the adjacent gratings 122 move in a differential direction, that is, one grid 122 is lifted upwards and advanced, the other grid 122 is settled downwards and retracted, two points in contact with the cobblestones rotate in completely opposite directions, the cobblestones can be shifted to adjust the positions, meanwhile, the distance between the grids 122 is enlarged by the differential motion of the adjacent grids 122, the cobblestones can slide out of the grids 122 and fall down, and the cobblestones with large sizes can be inclined and advanced to lift and slide out of the grids 122 along with the alternation of the grids 122.

As shown in fig. 6, the connecting structure of the bar 1222 and the crankshaft 1221 is schematically shown, the bar 1222 is separated at the connecting position, and is fastened by a bolt (not shown), and a bearing is arranged between the bar 1222 and the crankshaft 1221 to ensure that the bar 1222 can rotate.

As shown in fig. 5, in addition to reducing the movement resistance of the stick 1222, the support rod 1223 is provided with a rolling sleeve for supporting the stick 1222, the rolling sleeve is mounted on the support rod 1223 through a bearing, and further reduces the movement resistance of the stick 1222 by rolling friction instead of sliding friction, and the surface of the rolling sleeve is provided with a groove for accommodating the stick 1222 and limiting the movement.

The crankshaft 1221 can be directly driven by a motor through a gear engagement, which is a conventional technique, and this embodiment will not be described in detail.

According to the separator 100, the present embodiment provides a method for manufacturing melon seed pieces, which specifically includes the following steps:

step one, sand and stone separation: arranging a material carrying plate 112 which is spirally bent and extended from top to bottom and a cylinder 111 which surrounds the outer part of the material carrying plate 112, throwing cobblestones containing silt from the upper part of the material carrying plate 112, cracking and stripping the silt blocks adhered to the surfaces of the cobblestones through collision in the sliding or rolling process of the cobblestones, crushing and separating the silt blocks in the further falling process of the cobblestones, and collecting the cobblestones at a discharge hole of the material carrying plate 112;

step two, cobblestone separation: the method comprises the steps that a crankshaft 1221 and a plurality of bars 1222 with one ends driven by the crankshaft 1221 and distributed at equal intervals are arranged, a supporting rod 1223 is arranged to support the other end of each bar 1222, collected cobblestones are thrown onto the bars 1222 from one end of the crankshaft 1221, the crankshaft 1221 is controlled to rotate to drive the adjacent bars 1222 to alternately perform lifting, advancing and sinking backspacing motions, large-size cobblestones slide out, small-size cobblestones fall from gaps between the adjacent bars 1222, and the large-size cobblestones and the small-size cobblestones are collected respectively;

It should be noted that before the first step, the pebbles collected by dredging the river are piled up to obtain the pebbles mixed with the dry sediment blocks, so that the separation in the first step can be carried out.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The manufacturing method of the melon seed slices is characterized by sequentially comprising the following steps:

step one, sand and stone separation: arranging a material carrying plate (112) which is spirally bent and extended from top to bottom and a cylinder (111) which surrounds the outer part of the material carrying plate (112), throwing cobblestones containing silt from the upper part of the material carrying plate (112), cracking and stripping silt blocks adhered to the surfaces of the cobblestones through collision in the sliding or rolling process of the cobblestones, crushing and separating the silt blocks in the further falling process of the cobblestones, and collecting the cobblestones at a discharge hole of the material carrying plate (112);

step two, cobblestone separation: the method comprises the steps that a crankshaft (1221) and a plurality of bars (1222) with one ends driven by the crankshaft (1221) and distributed at equal intervals are arranged, a supporting rod (1223) is arranged to support the other end of each bar (1222), collected cobblestones are thrown onto the bars (1222) from one end of the crankshaft (1221), the crankshaft (1221) is controlled to rotate to drive adjacent bars (1222) to alternately perform lifting, advancing and sinking backspacing motions, large-size cobblestones slide out, small-size cobblestones fall down from gaps between the adjacent bars (1222), and the large-size cobblestones and the small-size cobblestones are collected respectively;

2. A melon seed flake production apparatus for carrying out the melon seed flake production method according to claim 1, the melon seed flake production apparatus comprising a separator (100), the separator (100) comprising:

the silt separation part (110), the top of the silt separation part (110) is provided with an opening for putting silt-containing cobbles, the bottom of the silt separation part is provided with an outlet for discharging cobbles, the silt separation part (110) comprises a cylinder (111) and a material carrying plate (112) fixed on the inner side wall of the cylinder (111), the material carrying plate (112) bends spirally from the opening of the cylinder (111) and extends downwards to the outlet, and a dust exhaust hole (113) is formed in the joint of the cylinder (111) and the material carrying plate (112);

the feeding port of the gravel separating part (120) corresponds to the outlet of the sediment separating part (110), the gravel separating part (120) comprises a box body (121) and a grating (122), and the grating (122) is transversely arranged in the box body (121) to divide the box body (121) into an upper area and a lower area; the grating (122) comprises a crankshaft (1221) and a plurality of rods (1222) distributed at equal intervals, one end of each rod (1222) is connected with the crankshaft (1221), the other end of each rod is supported by a supporting rod (1223), the supporting rods (1223) are arranged at the discharge end of the grating (122), the crankshaft (1221) is arranged at the feed end of the grating (122), and the adjacent rods (1222) are driven by the crankshaft (1221) to alternately perform lifting, advancing and sinking and retreating motions.

3. The melon seed slice manufacturing device as claimed in claim 2, wherein the inner side wall of the cylinder (111) is further provided with a lug (114) with a sharp part.

4. Melon seed flake production apparatus according to claim 2, wherein the cylinder (111) comprises an inner wall (1111) and an outer wall (1112), the inner wall (1111) is connected to the material-carrying plate (112), and a dust collection main chamber (118) is formed between the inner wall (1111) and the outer wall (1112).

5. The melon seed slice manufacturing device as claimed in claim 4, wherein the material carrying plate (112) comprises an upper plate body (1121), a lower plate body (1122) and a side plate (1123), the upper plate body (1121) is provided with a strip-shaped hole (1124), one side of the upper plate body (1121) and the lower plate body (1122) is connected with the inner wall (1111), the other side of the upper plate body (1121) and the lower plate body (1122) is connected with the inner wall in a sealing mode through the side plate (1123), a dust collection auxiliary cavity (119) is formed between the upper plate body (1121) and the lower plate body (1122), and the dust collection auxiliary cavity (119) is communicated with the dust collection main cavity (118).

6. The melon seed slice manufacturing device as claimed in claim 4 or 5, wherein the lower end of the material carrying plate (112) is further provided with a transition plate (115), the transition plate (115) and the material carrying plate (112) are distributed in a step shape, a dust collection gap (116) is formed between the transition plate (115) and the material carrying plate (112), a blower (117) is arranged on the blanking side of the dust collection gap (116), and the dust collection gap (116) is communicated with a dust collection main cavity (118).

7. The melon seed slice manufacturing device as claimed in claim 2, wherein the support rod (1223) is provided with a rolling sleeve.