A wet ball mill and its corrugated liner.

Abstract

This utility model relates to the field of grinding equipment technology, specifically to a wet ball mill and its corrugated liner. The corrugated liner includes a liner base, the outer side of which has an arcuate surface extending in an arc direction that matches the inner surface of the ball mill cylinder. The inner side of the liner base is a wavy curved surface, and inclined surfaces are provided on both sides of the liner base along the arc direction. A novel wet ball mill includes a cylinder, the inner circumferential wall of which is provided with multiple corrugated liners as described above, which are embedded and spliced ​​along the circumferential and axial directions of the cylinder. The corrugated liner with alternating peaks and troughs proposed in this application, and the wet ball mill equipped with the aforementioned corrugated liner, can significantly reduce the number of bolts penetrating the cylinder, reduce the risk of material leakage, thereby reducing mill maintenance time and improving the operating rate of the grinding equipment.

Description

Technical Field

[0001] This utility model relates to the field of grinding equipment technology, specifically to a wet ball mill and its corrugated liner. Background Technology

[0002] The working principle of a wet ball mill is that the electric motor drives the cylinder to rotate through the reducer and large and small gear pairs. The material is fed into the cylinder from the feed end. Inside the cylinder, the material is crushed due to the impact and self-grinding caused by the falling steel balls, the material itself, and part of the liquid.

[0003] A wet ball mill is mainly composed of a cylinder, motor, reducer, feed section, discharge section and grinding media (such as steel balls), while the liners are divided into cylinder liners, end liners, etc.

[0004] The wet ball mill is a crucial piece of equipment in the vanadium trioxide (V2O3) production process. Its main function in V2O3 production is to mix and react the calcined high-temperature clinker (around 400℃) with water within the mill cylinder to achieve slurry preparation. The clinker is fed evenly into the mill chamber via a hollow shaft screw feeder through a feed bushing. This chamber contains corrugated liners and steel balls of varying sizes. The rotation of the cylinder generates centrifugal force, lifting the steel balls to a certain height before they fall, impacting and grinding the material. This process forms a solid-liquid mixture within the chamber, further grinding the material to complete the grinding operation and form a slurry. The slurry is then discharged from the discharge screw feeder and transported to the next process stage by a slurry pump.

[0005] Currently used wet ball mills suffer from several problems: The mill's cylinder liner uses rectangular rubber plates, each secured to the cylinder by two square-head bolts, requiring a total of 64 bolts. Due to the high temperature inside the cylinder, the strong impact of the steel balls, and accelerated wear, leakage and failure rates remain high. Furthermore, equipment failures are difficult to inspect and maintain, resulting in high repair costs. During operation, the ball mill reaches extremely high temperatures, around 90°C, making it difficult for maintenance personnel to approach for repairs. This leads to prolonged downtime, increasing maintenance costs, impacting the mill's efficiency, and hindering failure rate control. Therefore, existing technology requires improvement. Utility Model Content

[0006] In view of this, this utility model proposes a new type of wet ball mill and its corrugated liner, which can at least solve the problem of easy leakage in existing ball mills during long-term use.

[0007] The first aspect of this application proposes a corrugated liner for a wet ball mill, comprising a liner substrate, an outer side of the liner substrate having an arc surface extending in an arc direction that matches the inner surface of the ball mill cylinder, an inner side of the liner substrate having a wavy curved surface, and inclined surfaces provided on both sides of the liner substrate along the arc direction.

[0008] In some embodiments, the wavy surface of the liner substrate has at least two troughs.

[0009] The second aspect of this application discloses a wet ball mill, including a cylinder. The inner circumferential wall of the cylinder is provided with a plurality of corrugated liners as described above. The plurality of corrugated liners are inlaid and spliced ​​along the circumferential and axial directions of the cylinder to form an annular component. The outer surface of the annular component is a circumferential surface for mating with the inner surface of the ball mill cylinder. The inner surface of the annular component is a wavy curved surface that undulates along the circumferential direction. The inclined surfaces of two adjacent corrugated liners fit together.

[0010] In some embodiments, a rubber gasket is installed on the inner wall of the cylinder, and multiple corrugated liners are disposed on the inner side of the rubber gasket.

[0011] In some embodiments, a manhole is provided on the cylinder, and the wet ball mill includes a cover plate covering the manhole, the edge of which is detachably connected to the cylinder by a bolt assembly.

[0012] In some embodiments, the manhole is provided with a starting end and a ending end extending axially along the cylinder on both sides. A plurality of fixed wedges are provided along the extension direction of the starting end and the ending end. The two sides of the fixed wedge are inclined top pressing surfaces. The corrugated liner plates on both sides of the fixed wedge have inclined mating surfaces that cooperate with the top pressing surfaces of the fixed wedge. The fixed wedge is fixed to the cylinder by fasteners and can apply compressive force to the corrugated liner plates on both sides as the fasteners are fixed.

[0013] In some embodiments, each fixing wedge is provided with a connecting hole that mates with a fastener, and the connecting hole gradually enlarges from the outside to the inside.

[0014] In some embodiments, a fastening area is further provided between the starting end and the ending end. The fastening area is located on the opposite side of the manhole and extends from one end of the cylinder to the other end of the cylinder along the axial direction of the cylinder. The fastening area is provided with a plurality of fastening wedges arranged along its extension direction. The fastening wedges have the same structure as the fixing wedges.

[0015] In some embodiments, the two ends of the cylinder are a feed end and a discharge end, respectively. The discharge end is provided with a discharge section, which includes a grid plate and a discharge end cover. The grid plate is a circular plate with grate holes distributed on it. The circular plate has an annular groove. The discharge end cover is provided with an annular boss that cooperates with the annular groove. The discharge end cover is connected to the discharge end of the cylinder by flange bolts, clamping the grid plate between the cylinder and the discharge end cover.

[0016] In some embodiments, the feed end of the cylinder is provided with a feed section, which includes a feed hollow shaft and an end liner. The feed hollow shaft is fixed to the feed end of the cylinder by flange bolts. A feed bushing is installed on the inner wall. The end liner is provided with an annular groove that mates with the flange on the feed hollow shaft, so as to clamp the end liner between the cylinder and the feed hollow shaft when the feed hollow shaft is connected to the feed end of the cylinder.

[0017] The beneficial effects of this application are as follows: Compared with the prior art, the corrugated liner with alternating crests and troughs proposed in this application, and the wet ball mill equipped with the aforementioned corrugated liner, facilitate the splicing of adjacent corrugated liners by setting inclined surfaces on both sides of the corrugated liner, which greatly reduces the number of bolts penetrating the cylinder, reduces the risk of material leakage, and thus reduces mill maintenance time and improves the operating rate of the grinding equipment. Furthermore, because multiple corrugated liners are spliced ​​together along the circumferential and axial directions of the cylinder, a three-dimensional grinding network can be formed, with steel balls falling at the crests and rolling at the troughs, increasing the material breakage rate by 10% to 20%. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a wave-shaped liner provided in one embodiment of the present invention; Figure 2 A cross-sectional view of a wave-shaped liner provided in one embodiment of the present utility model; Figure 3 A partial cross-sectional view of a novel wet ball mill cylinder provided in one embodiment of the present invention; Figure 4 for Figure 3 Sectional view of plane AA; Figure 5 A top view of a fixing wedge provided in one embodiment of the present invention; Figure 6 for Figure 5 Sectional view of BB; Figure 7 A side view of a fixing wedge provided in one embodiment of the present invention; Figure 8 A schematic diagram of the structure of a grid plate provided in one embodiment of this utility model; Figure 9 for Figure 8 Sectional view of the C-plane; Figure 10 A side sectional view of the discharge end cap provided in one embodiment of the present utility model; Figure 11 for Figure 10 Diagrams showing directions A and B; Figure 12This is a front view of an end liner provided in one embodiment of the present invention; Figure 13 for Figure 12 Sectional view of the DD plane; Figure 14 This is a diagram showing the fit between the cylinder, the feeding section, and the discharging section according to one embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Corrugated liner; 2. Cylinder body; 21. Manhole; 3. Cover plate; 4. Fixing wedge; 5. Connecting hole; 6. Top pressure surface; 7. Grid plate; 8. Discharge end cover; 9. Feed hollow shaft; 10. End liner; 11. Fastening wedge. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to specific examples and accompanying drawings.

[0022] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0023] The first aspect of this utility model provides a corrugated liner 1 for a wet ball mill, such as... Figure 1 and Figure 2 As shown, the system includes a liner substrate. The outer surface of the liner substrate has an arc-shaped surface extending in a circular arc direction that matches the inner surface of the ball mill cylinder 2, ensuring stable installation and preventing loosening due to impact caused by gaps. The inner surface of the liner substrate is a wavy curved surface with alternating peaks and troughs, forming a periodic undulating structure. The liner substrate has inward and / or outward extending inclined surfaces (e.g., 15°~30° angle) on both sides along the arc direction to facilitate the interlocking of adjacent liner substrates and guide the movement of steel balls and materials within the cylinder 2. Specifically, the liner substrate can be made of ZGMn13Cr material with superior performance. The inclined surfaces on both sides of the liner substrate can be configured such that one extends inward and the other outward, or both inclined surfaces on both sides extend inward or outward, or both inward and outward extending inclined surfaces on the same side.

[0024] In some embodiments, the corrugated surface of the liner substrate has at least two troughs. The alternating crests and troughs of the corrugated liner 1 enhance the diversity of the steel ball's trajectory, allowing the material to undergo more thorough impact and grinding. Furthermore, the corrugated structure reduces sliding friction of the steel balls, increases the number of effective impacts, and prevents excessive localized wear. The inclined surface and corrugated surface create a self-cleaning effect, preventing fine particles from adhering, making it particularly suitable for wet grinding.

[0025] The second aspect of this utility model provides a wet ball mill, such as... Figure 3 As shown, the device includes a horizontally arranged cylinder 2. The inner circumferential wall of the cylinder 2 is provided with multiple corrugated liners 1 as described above. These corrugated liners 1 are inlaid and spliced ​​along the circumferential and axial directions of the cylinder 2 to form an annular component. The outer surface of the annular component is a circumferential surface for mating with the inner surface of the ball mill cylinder 2, and the inner surface of the annular component is a wavy curved surface undulating along the circumferential direction. The inclined surfaces of adjacent corrugated liners 1 fit together. An inclined surface can refer to a surface that is inclined relative to the radial direction. The inclined surface on one side of a corrugated liner 1 can be inclined towards or away from its adjacent corrugated liner 1. One side of a corrugated liner 1 can have one inclined surface or two inclined surfaces in opposite directions to improve the reliability of the fit between adjacent corrugated liners 1. Specifically, the cylinder 2 is made of high-strength steel plate, supported at both ends by hollow shafts, and driven to rotate by a drive device. The multiple corrugated liners 1 are arranged in a ring along the inner wall of the cylinder 2, forming a continuous wavy curved surface to ensure the continuous trajectory of the steel balls. The corrugated liner 1 is installed in sections along the length of the cylinder 2 (e.g., each section is 1-2m long), and the corrugation of each section can be designed differently (e.g., the wave height is large at the feed end and small at the discharge end) to adapt to the needs of different grinding stages. The liner sections are filled with tenon and mortise structures or wear-resistant rubber gaskets to reduce wear caused by material erosion at the joints. Furthermore, dovetail grooves are pre-machined on the inner wall of the cylinder 2, and the rear surface of the liner is fitted with them to enhance impact resistance and stability.

[0026] Compared with existing technologies, this application utilizes a three-dimensional grinding network formed by circumferentially and axially spliced ​​corrugated surfaces. Steel balls are dropped at the crests and rolled at the troughs, increasing the material breakage rate by 10% to 20%. The corrugated structure reduces material adhesion to the walls, improving utilization efficiency by over 30%. Furthermore, because multiple corrugated liners 1 are inlaid and spliced ​​along the circumferential and axial directions of the cylinder 2, the number of bolts penetrating the cylinder 2 is significantly reduced, lowering the risk of material leakage, thereby reducing mill maintenance time and increasing the operating rate of the grinding equipment.

[0027] In some embodiments, a rubber gasket (not shown in the figure) is installed on the inner wall of the cylinder 2, and multiple corrugated liners 1 are disposed inside the rubber gasket. Specifically, the rubber gasket can be fixed to the inner wall of the cylinder 2 by adhesive bonding to prevent slippage. The surface of the gasket can be machined with grooves or ridges to enhance frictional locking with the corrugated liners 1. By setting the rubber gasket, the impact energy of the steel ball can be absorbed, the overall vibration is reduced by 30%, and the noise is reduced by more than 10 dB. It can also isolate the material from direct contact with the metal cylinder 2, extending the life of the cylinder 2 by 2 times.

[0028] In some embodiments, such as Figure 3 and Figure 4 As shown, a manhole 21 is provided on the cylinder 2. The wet ball mill includes a cover plate 3 covering the manhole 21, and the edge of the cover plate 3 is detachably connected to the cylinder 2 by a bolt assembly. Specifically, the manhole 21 is located on the side of the cylinder 2 for easy access for personnel to perform maintenance. An annular reinforcing flange is also welded to the edge of the manhole 21 to prevent stress concentration from causing deformation of the cylinder 2. An oil-resistant rubber sealing ring is embedded on the inner side of the cover plate 3, and waterproofing and dustproofing are achieved by bolt tightening.

[0029] In some embodiments, such as Figures 3 to 7 As shown, the manhole 21 has a starting end and a ending end extending axially along the cylinder 2 on both sides. Several fixing wedges 4 are provided along the extension direction of both the starting end and the ending end. The two sides of the fixing wedges 4 are inclined pressure surfaces 6. The corrugated liners 1 located on both sides of the fixing wedges 4 have inclined mating surfaces that cooperate with the pressure surfaces 6 of the fixing wedges 4. The fixing wedges 4 are fixed to the cylinder 2 by fasteners, and as the fasteners are fixed, they can apply compressive force to the corrugated liners 1 on both sides, causing the multiple corrugated liners 1 arranged circumferentially to press against each other and arrange themselves tightly, thus fixing them together more securely. The pressure surface 6 on each side can be inclined from the inside out towards the corrugated liner 1 away from that side, with an inclination angle of 15°~25° on both sides, ensuring that the corrugated liners 1 become increasingly tighter under pressure. Each fixed wedge 4 has a connecting hole 5 for fasteners (e.g., bolts) to pass through and connect to the cylinder 2. The corrugated liners 1 on both sides of the fixed wedge 4 have inclined mating surfaces that abut against the top pressing surface 6 of the fixed wedge 4, forming a self-locking structure. During installation, the fixed wedge 4 is pre-fixed to the cylinder 2 with bolts; the corrugated liners 1 are inserted starting from the manhole 21, ensuring their inclined mating surfaces align with the top pressing surface 6; the bolts are tightened, and the top pressing surface 6 of the fixed wedge 4 radially presses the corrugated liners 1, simultaneously providing axial positioning and applying tangential compressive force. The inclined self-locking design prevents displacement of the corrugated liners 1 during operation, reducing the risk of bolt breakage by 90%.

[0030] In some embodiments, such as Figures 3 to 7As shown, each fixing wedge 4 is provided with a connecting hole 5 for mating with a fastener, and the connecting hole 5 gradually enlarges from the outside to the inside. Specifically, three fixing wedges 4 are provided at both the starting and ending ends, and each fixing wedge has two connecting holes 5 along the axial direction of the cylinder 2. The connecting holes 5 are trapezoidal holes with an flaring angle of 5°~10°, used for mating with tapered bolts. This application uses a double-ended stud + tapered nut. When tightened, the nut generates a radial component force along the inclined surface of the trapezoidal hole, which increases the clamping force between the fixing wedge 4 and the corrugated liner 1 by 30%.

[0031] In some embodiments, such as Figure 4 As shown, a fastening zone is also provided between the starting end and the ending end. The fastening zone is located on the opposite side of the manhole 21 and extends along the axial direction of the cylinder 2 from one end of the cylinder 2 to the other end. The fastening zone is provided with several fastening wedges 11 arranged at equal intervals along its extension direction to form a continuous compression band. The fastening wedges 11 have the same structure as the fixed wedges 4. The fastening wedges 11 in the fastening zone and the fixed wedges 4 on both sides are arranged in an alternating manner to ensure that the corrugated liner 1 is subjected to uniform force throughout its circumference.

[0032] Conventional wet ball mill end liners use fan-shaped checkered liners, each fixed to the end liner with two square-head bolts, and the end liner is fixed to the feed and discharge ends with 32 bolts. The mechanical properties of the fan-shaped checkered liners change significantly at high temperatures, making them prone to plastic deformation. High temperatures also accelerate various chemical reactions between the checkered liners and the materials, all of which exacerbate wear and tear on the liners and cause leaks.

[0033] In some embodiments of this utility model, the two ends of the cylinder 2 are a feeding end and a discharging end, respectively, and the discharging end is provided with a discharging part, such as... Figures 8 to 11 and Figure 14 As shown, the discharge section includes a grid plate 7 and a discharge end cover 8. The grid plate 7 is a circular plate with grate holes distributed on it, and the outer edge of the circular plate has an annular groove. The discharge end cover 8 is provided with an annular boss that mates with the annular groove. The discharge end cover 8 is connected to the discharge end of the cylinder 2 by flange bolts, clamping the grid plate 7 between the cylinder 2 and the discharge end cover 8. Specifically, the annular groove on the outer edge of the grid plate 7 is 20~30mm deep, forming a labyrinth seal with the annular boss of the discharge end cover 8 to prevent material leakage. The diameter of the grate holes on the feed side is 8~12mm, and on the discharge side it is 5~8mm, achieving dynamic grading. During installation, the positioning ring of the grid plate 7 is embedded into the end face of the cylinder 2; the annular boss of the discharge end cover 8 is pressed into the groove, and the flange bolts are pre-tightened; the hydraulic wrench is used to tighten in stages to ensure uniform pressure.

[0034] The grid plate 7 in this application adopts an integral circular design, avoiding the problem of plastic deformation that traditional fan-shaped liners are prone to at high temperatures. Simultaneously, the labyrinth seal structure effectively reduces the number of bolts used, lowering the risk of leakage. Furthermore, the design of the integral circular grid plate 7 and the discharge end cover 8 makes the equipment structure more compact, allowing for smoother material discharge, reducing material accumulation and blockage at the discharge end, and improving equipment operating efficiency. By embedding the positioning ring of the grid plate 7 into the end face of the cylinder 2, pressing the annular boss of the discharge end cover 8 into the groove, and pre-tightening the flange bolts, the installation method is simple and straightforward, allowing operators to quickly complete the installation work.

[0035] In some embodiments, the feed end of the cylinder 2 is provided with a feed section, such as... Figures 12 to 14 As shown, the feeding section includes a hollow feeding shaft 9 and an end liner 10. The hollow feeding shaft 9 is fixed to the feeding end of the cylinder 2 by flange bolts. A feeding bushing is installed on the inner wall of the bushing, and a spiral guide groove is machined on the inner wall of the bushing. This effectively guides the material to move forward along the spiral direction during the feeding process, reducing material accumulation and blockage at the feeding inlet and increasing the feeding speed by 20%. The end liner 10 is provided with an annular groove that mates with the flange on the hollow feeding shaft, so that when the hollow feeding shaft 9 is connected to the feeding end of the cylinder 2, the end liner 10 is clamped between the cylinder 2 and the hollow feeding shaft 9. Specifically, the annular groove of the end liner 10 is 15~20mm deep and has an O-ring rubber ring inside, achieving a double seal between the hollow feeding shaft 9 and the cylinder 2. This design can effectively prevent material leakage from the feeding end and maintain a good sealing effect even under high pressure or high concentration material conditions. Furthermore, the feed section is designed to be compact and reasonable. The end liner 10 is tightly fitted with the feed hollow shaft 9 and the cylinder 2 through the annular groove, which can effectively disperse the impact force of the material on the feed end, reduce the wear of the cylinder 2 and the feed hollow shaft 9, and further improve the overall durability of the equipment.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A corrugated liner (1) for a wet ball mill, characterized in that, The liner substrate includes an outer surface of the liner substrate that matches the inner surface of the ball mill cylinder (2) and extends along the arc direction. The inner surface of the liner substrate is a wavy curved surface. The liner substrate has inclined surfaces on both sides along the arc direction.

2. The corrugated liner (1) according to claim 1, characterized in that, The wavy surface of the liner substrate has at least two troughs.

3. A wet ball mill, comprising a cylinder (2), characterized in that, The inner circumferential wall of the cylinder (2) is provided with a plurality of corrugated liners (1) as described in any one of claims 1 and 2. The plurality of corrugated liners (1) are inlaid and spliced ​​along the circumferential and axial directions of the cylinder (2) to form an annular component. The outer surface of the annular component is a circumferential surface for cooperating with the inner surface of the ball mill cylinder (2). The inner surface of the annular component is a wave-shaped curved surface that undulates along the circumferential direction. The inclined surfaces of two adjacent corrugated liners (1) cooperate with each other.

4. The wet ball mill according to claim 3, characterized in that, A rubber liner is installed on the inner wall of the cylinder (2), and a plurality of the corrugated liner plates (1) are disposed on the inner side of the rubber liner.

5. The wet ball mill according to claim 3, characterized in that, The cylinder (2) has a manhole (21) and the wet ball mill includes a cover plate (3) covering the manhole (21). The edge of the cover plate (3) is detachably connected to the cylinder (2) by a bolt assembly.

6. The wet ball mill according to claim 5, characterized in that, The manhole (21) has a starting end and a ending end extending axially along the cylinder (2) on both sides. Several fixed wedges (4) are provided along the extension direction of the starting end and the ending end. The fixed wedges (4) have inclined top pressing surfaces (6) on both sides. The corrugated liner (1) on both sides of the fixed wedge (4) has an inclined mating surface that mates with the top pressing surface (6) of the fixed wedge (4). The fixed wedge (4) is fixed to the cylinder (2) by fasteners and can apply a compressive force to the corrugated liner (1) on both sides as the fasteners are fixed.

7. The wet ball mill according to claim 6, characterized in that, Each fixing wedge (4) is provided with a connecting hole (5) that mates with the fastener, and the connecting hole (5) gradually enlarges from the outside to the inside.

8. The wet ball mill according to claim 7, characterized in that, A fastening area is provided between the starting end and the ending end. The fastening area is located on the opposite side of the manhole (21) and extends from one end of the cylinder (2) to the other end of the cylinder (2) along the axial direction of the cylinder (2). The fastening area is provided with a plurality of fastening wedges (11) arranged along its extension direction. The fastening wedges (11) have the same structure as the fixing wedges (4).

9. The wet ball mill according to claim 3, characterized in that, The two ends of the cylinder (2) are the feed end and the discharge end, respectively. The discharge end is provided with a discharge section, which includes a grid plate (7) and a discharge end cover (8). The grid plate (7) is a circular plate with grate holes distributed on it. The circular plate has an annular groove. The discharge end cover (8) is provided with an annular boss that cooperates with the annular groove. The discharge end cover (8) is connected to the discharge end of the cylinder (2) by flange bolts, and the grid plate (7) is sandwiched between the cylinder (2) and the discharge end cover (8).

10. The wet ball mill according to claim 3, characterized in that, The feed end of the cylinder (2) is provided with a feed section, which includes a feed hollow shaft (9) and an end liner (10). The feed hollow shaft (9) is fixed to the feed end of the cylinder (2) by flange bolts. A feed bushing is installed on the inner wall. The end liner (10) is provided with an annular groove that mates with the flange on the feed hollow shaft (9) so that when the feed hollow shaft (9) is connected to the feed end of the cylinder (2), the end liner (10) is clamped between the cylinder (2) and the feed hollow shaft (9).

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