CN217950873U - Hydraulic cylinder - Google Patents

Abstract

The utility model provides a hydraulic cylinder relates to metallurgical rolling equipment technical field, and the hydraulic cylinder includes cylinder body, piston, displacement sensor and guide pillar, the piston set up in the cylinder body, first recess has been seted up to a terminal surface of piston, the second recess has been seted up to another terminal surface of piston, the guide pillar is located in the first recess, and connect in the cylinder body, displacement sensor install in the second recess, displacement sensor includes induction rod and magnetic ring, induction rod wears to locate in the inside oil circuit of guide pillar, the magnetic ring cover is located induction rod, just the magnetic ring connect in the guide pillar is close to displacement sensor's one end. The utility model discloses compare in current pneumatic cylinder, through place the cylinder body in with the guide pillar in, avoid aqueous vapor corrosion and take place the dead phenomenon of rust to the life of pneumatic cylinder has been improved.

Description

Hydraulic cylinder

Technical Field

The utility model relates to a metallurgical rolling equipment technical field particularly, relates to a pneumatic cylinder.

Background

The HGC hydraulic cylinder and the AGC hydraulic cylinder are used as key parts of the rolling mill, transfer the rolling load of the rolling mill on a steel plate, adjust the distance between the rolling mill and a roller, control the thickness and the plate shape of the steel plate, and directly influence the quality of a strip steel product by the performance and the precision of the HGC hydraulic cylinder and the AGC hydraulic cylinder.

Present HGC pneumatic cylinder or AGC pneumatic cylinder are for the stroke position of detection piston, set up guide pillar and displacement sensor on the cylinder body usually, but most guide pillar and displacement sensor and piston, the assembly is unreasonable between the cylinder body, at first, the guide pillar exposes outside at the cylinder body mostly, the guide pillar that leads to the pneumatic cylinder from this stretches out the cylinder body and exposes the part and very easily takes place the rust phenomenon because of the aqueous vapor corrosion, secondly, displacement sensor need pass through intermediate junction spare fixed mounting, increased and revealed oily hidden danger point, thereby it is more to lead to the position that needs to seal.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the problem that will solve is: how to improve the life of pneumatic cylinder.

The utility model provides a hydraulic cylinder, include: the piston is arranged in the cylinder body, a first groove is formed in one end face of the piston, a second groove is formed in the other end face of the piston, the guide pillar is located in the first groove and connected to the cylinder body, the displacement sensor is installed in the second groove and comprises an induction rod and a magnetic ring, the induction rod penetrates through the inner oil path of the guide pillar, the induction rod is sleeved with the magnetic ring, and the magnetic ring is connected to one end, close to the displacement sensor, of the guide pillar.

The utility model provides a pair of hydraulic cylinder compares in prior art, has but not be limited to following beneficial effect:

pneumatic cylinder for install at rolling mill memorial archway bottom terminal surface, the utility model discloses a piston setting is inside the cylinder body to first recess has been seted up to the piston, first recess seals inside the cylinder body, does not have the contact with the cylinder body outside, and the guide pillar is connected inside the cylinder body to be located first recess, consequently the guide pillar can only contact with the fuel feeding medium in the cylinder body, can not appear leading to rusty dead phenomenon because of outside aqueous vapor corrodes, reduced the position that needs to seal, thereby reduced and let out leakage oil hidden danger point. In addition, in the process that the piston extends out and retracts relative to the cylinder body, a magnetic ring of the displacement sensor moves relative to the induction rod, so that the stroke position of the piston is accurately detected, the displacement sensor is directly installed in the second groove of the piston, an intermediate connecting piece is not needed to be installed, and the hidden danger of oil leakage existing in the intermediate connecting piece is eliminated. The utility model discloses compare in current pneumatic cylinder, through place the cylinder body in with the guide pillar in, avoid aqueous vapor corrosion and take place the phenomenon of dying of rusty to the life of pneumatic cylinder has been improved.

Optionally, the hydraulic cylinder further includes a first oil path block, the first oil path block is disposed on the cylinder body, the first oil path block is provided with a first oil hole, the first oil hole is communicated with an internal oil path of the cylinder body, and the internal oil path of the cylinder body is communicated with an internal oil path of the guide pillar.

Optionally, the hydraulic cylinder further comprises a concave spherical pad mounted in the second groove, so that the displacement sensor is sealingly disposed in the second groove.

Optionally, the hydraulic cylinder further comprises a convex spherical pad and a fixing ring, the convex spherical pad is mounted on the end face, close to the concave spherical pad, of the piston through the fixing ring, and a gap is reserved between the convex spherical pad and the fixing ring and used for eliminating part of radial force.

Optionally, this pneumatic cylinder still includes second oil circuit piece and cylinder cap, the cylinder cap connect in the cylinder body, second oil circuit piece sets up on the cylinder cap, the second oilhole has been seted up to second oil circuit piece, the second oilhole with the inside oil circuit intercommunication of cylinder cap, the inside oil circuit of cylinder cap with the inside intercommunication of cylinder body.

Optionally, this pneumatic cylinder still including prevent changeing the apron and preventing changeing the slide, prevent changeing the apron install in the piston is close to the terminal surface of cylinder cap, prevent changeing the slide install in prevent changeing the apron and being close to the one end of second oil circuit piece, just prevent changeing the slide for prevent changeing the apron and set up perpendicularly, prevent changeing the slide and seted up the spout, second oil circuit piece sliding connection in the spout.

Optionally, the piston is provided with a first wiring groove, the anti-rotation cover plate is communicated with a second wiring groove, and the first wiring groove and the second wiring groove are used for leading out a cable of the displacement sensor to the outside of the cylinder body.

Optionally, the hydraulic cylinder further comprises a telescopic dust cover, and the telescopic dust cover is installed between the cylinder cover and the anti-rotation cover plate.

Optionally, this pneumatic cylinder still include apron, axle sleeve and hollow block connect in the piston, the axle connect in the apron, just the axle is relative to the apron sets up perpendicularly, on the hollow block, the axle sleeve install in hollow block wears to locate the axle sleeve.

Optionally, the cylinder body is provided with a boss matched with the shape of the end face of the bottom of the rolling mill housing.

Drawings

Fig. 1 is a first schematic structural diagram of a hydraulic cylinder according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram ii of a hydraulic cylinder according to an embodiment of the present invention;

fig. 3 is a third schematic structural diagram of a hydraulic cylinder according to an embodiment of the present invention;

fig. 4 is a side view of a hydraulic cylinder in accordance with an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a piston according to an embodiment of the present invention.

Description of the reference numerals:

1. a cylinder body; 11. a boss; 12. a piston cavity; 2. a piston; 21. a first groove; 22. a second groove; 221. a large groove; 222. a small groove; 23. a first wiring duct; 3. a cylinder cover; 4. a displacement sensor; 41. an induction rod; 42. a magnetic ring; 5. a guide post; 61. a first oil path block; 62. a second oil path block; 71. a concave spherical pad; 72. a convex spherical pad; 73. a fixing ring; 81. an anti-rotation cover plate; 811. a second wiring duct; 82. an anti-rotation slide plate; 83. a chute; 91. a cover plate; 92. a shaft; 93. a shaft sleeve; 94. a hollow block; 10. provided is a telescopic dust cover.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it should be understood that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Also, in the drawings, the Z-axis represents a vertical, i.e., up-down position, and a positive direction of the Z-axis (i.e., an arrow direction of the Z-axis) represents up, and a negative direction of the Z-axis (i.e., a direction opposite to the positive direction of the Z-axis) represents down; in the drawings, the X-axis indicates the lateral, i.e., left-right, position, and the positive direction of the X-axis (i.e., the arrow direction of the X-axis) indicates the right, and the negative direction of the X-axis (i.e., the direction opposite to the positive direction of the X-axis) indicates the left.

It should also be noted that the foregoing Z-axis and X-axis are meant only to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

As shown in fig. 1, the utility model discloses a hydraulic cylinder, include: cylinder body 1, piston 2, displacement sensor 4 and guide pillar 5, cylinder cap 3 is connected in cylinder body 1, piston 2 sets up in cylinder body 1, first recess 21 has been seted up to one end face of piston 2, second recess 22 has been seted up to another end face of piston 2, guide pillar 5 is located first recess 21, and connect in cylinder body 1, displacement sensor 4 installs in second recess 22, displacement sensor 4 includes inductive rod 41 and magnetic ring 42, inductive rod 41 wears to locate in the inside oil circuit of guide pillar 5, inductive rod 41 is located to the magnetic ring 42 cover, and magnetic ring 42 connects in the one end that guide pillar 5 is close to displacement sensor 4.

In this embodiment, as shown in the attached drawing 1, this pneumatic cylinder is used for installing at rolling mill memorial archway bottom terminal surface, piston 2 of this pneumatic cylinder sets up inside cylinder body 1, and first recess 21 has been seted up to piston 2, first recess 21 seals inside cylinder body 1, there is not the contact with 1 outside of cylinder body, guide pillar 5 is connected inside cylinder body 1, and be located first recess 21, consequently, guide pillar 5 can only contact with the interior fuel feeding medium of cylinder body 1, the phenomenon of leading to rust death because of outside aqueous vapor corrosion can not appear, the position that needs to seal has been reduced, thereby leakage oil hidden danger point has been reduced. In addition, in the process that the piston 2 extends and retracts relative to the cylinder body, the magnetic ring 42 of the displacement sensor 4 moves relative to the induction rod 41, so that the stroke position of the piston 2 is accurately detected, and the displacement sensor 4 is directly arranged in the second groove 22 of the piston 2, so that an intermediate connecting piece is not required to be arranged, and the hidden danger of oil leakage existing in the intermediate connecting piece is eliminated. The utility model discloses compare in current pneumatic cylinder, through place the cylinder body in 5 with the guide pillar in, avoid aqueous vapor corrosion and take place the dead phenomenon of rust to the life of pneumatic cylinder has been improved.

In the above working process, as shown in fig. 1, a non-through shallow groove is formed on the bottom surface inside the cylinder 1 (i.e. the positive direction of the Z axis in fig. 1), and the guide pillar 5 can be installed on the shallow groove on the bottom surface inside the cylinder 1 by a threaded connection member (e.g. a bolt in fig. 1); piston 2 needs to install the piston chamber 12 to cylinder body 1 after the sealing washer and the guidance tape are assembled completely, the outer terminal surface of piston 2 (the terminal surface that piston 2 is close to cylinder cap 3 is Z axle opposite direction in the attached drawing 1) processing has second recess 22, be used for installing displacement sensor 4, and displacement sensor 4 accessible threaded connection is in second recess 22 department, and displacement sensor 4's screw thread department is from taking the sealing washer, can effectively avoid letting out leakage oil, the inner terminal surface of piston 2 (the terminal surface that piston 2 keeps away from cylinder cap 3 is Z axle positive direction in the attached drawing 1) processing has first recess 21, the airtight space that first recess 21 and cylinder body 1 enclose is used for placing guide pillar 5.

Optionally, the hydraulic cylinder further includes a first oil path block 61, the first oil path block 61 is disposed on the cylinder block 1, the first oil path block 61 is opened with a first oil hole, the first oil hole is communicated with an internal oil path of the cylinder block 1, and the internal oil path of the cylinder block 1 is communicated with an internal oil path of the guide pillar 5.

In this embodiment, as shown in fig. 1, the first oil path block 61 may be mounted on the cylinder block 1 by a bolt, high-pressure oil may be injected into the piston cavity 12 through a first oil hole of the first oil path block 61, and the first oil hole is communicated with the hole passage of the displacement sensor 4 through an internal oil path of the cylinder block 1 and an internal oil path of the guide pillar 5, so as to facilitate air exhaust during initial installation of the hydraulic cylinder.

Optionally, the hydraulic cylinder further comprises a concave spherical pad 71, and the concave spherical pad 71 is mounted in the second groove 22, so that the displacement sensor 4 is hermetically arranged in the second groove 22.

In this embodiment, as shown in fig. 1 and fig. 5, the second groove 22 includes an outer groove 221 and an inner groove 222, the displacement sensor 4 can be connected to the hole of the inner groove 222 through a screw thread, and the screw thread of the displacement sensor 4 is provided with a sealing ring, so as to effectively avoid oil leakage, and the concave spherical pad 71 with the sealing ring can be mounted at the outer groove 221 through a bolt, so as to form a closed space (i.e., the inner groove 222) to ensure that the displacement sensor 4 works under the working conditions of no water, no dust, and no oil.

Optionally, the hydraulic cylinder further comprises a convex spherical pad 72 and a fixing ring 73, wherein the convex spherical pad 72 is mounted on the end surface of the piston 2 close to the concave spherical pad 71 through the fixing ring 73, and a gap is left between the convex spherical pad 72 and the fixing ring 73 for eliminating part of radial force.

In this embodiment, referring to fig. 1, the convex spherical pad 72 is mounted on the end face of the piston 2 through the fixing ring 73, the fixing ring 73 can be mounted on the piston 2 through the bolt, and the gap is formed between the convex spherical pad 72 and the fixing ring 73, and the characteristics of the spherical pad itself are matched, so that the relative rotation and the inclination angle of about 1 ° can be allowed between them, thereby achieving the purpose of eliminating part of the radial force. In addition, grease lubrication ports are designed in the grooves of the convex spherical pads 72 for lubrication of the spherical pads. When the displacement sensor 4 is replaced, the fixed ring 73, the convex spherical pad 72, and the concave spherical pad 71 can be removed without removing the hydraulic cylinder, and the maintenance and replacement time of the displacement sensor 4 is shortened. The convex spherical pad 72 and the concave spherical pad 71 eliminate radial force caused by unbalance loading, improve the stress state of the hydraulic cylinder, prolong the service life of the sealing ring and further prolong the service life of the hydraulic cylinder.

Optionally, the hydraulic cylinder further includes a second oil path block 62 and a cylinder cover 3, the cylinder cover 3 is connected to the cylinder body 1, the second oil path block 62 is disposed on the cylinder cover 3, a second oil hole is formed in the second oil path block 62, the second oil hole is communicated with an internal oil path of the cylinder cover 3, and the internal oil path of the cylinder cover 3 is communicated with the inside of the cylinder body 1.

In this embodiment, referring to fig. 1, high-pressure hydraulic oil enters the piston chamber 12 from the first oil hole of the first oil path block 61, the piston 2 extends in the opposite direction along the Z-axis, a target rolling force is generated according to the requirement, and the oil flows back to the valve group from the second oil hole of the second oil path block 62; high-pressure hydraulic oil enters the piston cavity 12 from the second oil hole of the second oil path block 62, the piston 2 retracts in the positive direction of the Z axis, and the magnetic ring 42 of the displacement sensor 4 also ascends and descends relative to the induction rod 41 (in the direction of the Z axis in fig. 1) during the process that the piston 2 extends and retracts along the Z axis, so that the stroke position of the piston 2 is accurately detected.

In the above operation process, referring to fig. 1, the second oil path block 62 may be mounted on the cylinder head 3 by bolts, and the second oil hole of the second oil path block 62 is communicated with the internal oil path of the cylinder head 3 and the piston cavity 12, and is used for supplying high-pressure oil and exhausting gas into the piston cavity 12. The cylinder cover 3 is mounted on the cylinder body 1 through the piston 2 after a sealing ring and a guide belt are assembled, is fixed by a plurality of screws and gives a certain pretightening force.

Optionally, the hydraulic cylinder further comprises an anti-rotation cover plate 81 and an anti-rotation sliding plate 82, the anti-rotation cover plate 81 is installed on the end face, close to the cylinder head 3, of the piston 2, the anti-rotation sliding plate 82 is installed on one end, close to the second oil circuit block 62, of the anti-rotation cover plate 81, the anti-rotation sliding plate 82 is vertically arranged relative to the anti-rotation cover plate 81, a sliding groove 83 is formed in the anti-rotation sliding plate 82, and the second oil circuit block 62 is slidably connected to the sliding groove 83.

In this embodiment, as shown in fig. 1 and fig. 4, an anti-rotation cover plate 81 can be mounted on an outer end surface of the piston 2 (in an opposite direction to the Z axis in fig. 1) by bolts, an anti-rotation sliding plate 82 can be mounted on one end of the anti-rotation cover plate 81 close to the second oil path block 62 by bolts vertically (in a direction of the Z axis in fig. 1), the second oil path block 62 can only slide in a sliding groove 83 of the anti-rotation sliding plate 82 along the Z axis direction, the second oil path block 62 is connected with the cylinder head 3 and the cylinder body 1 as a whole, the anti-rotation cover plate 81 is connected with the anti-rotation sliding plate 82 and the piston 2 as a whole, and thus a mechanism for limiting the cylinder body 1 and the piston 2 from rotating relatively is formed. The pneumatic cylinder is in high pressure, high temperature, high frequency vibration's operating mode, and restriction piston 2 produces relative rotation with cylinder body 1 and can improve the service behavior of sealing washer, prolongs the life of sealing washer, can avoid displacement sensor 4's cable also to be broken along with piston 2 rotates simultaneously.

Optionally, the piston 2 is provided with a first wiring groove 23, the rotation-preventing cover plate 81 is provided with a second wiring groove 811 communicated with the first wiring groove 23, and the first wiring groove 23 and the second wiring groove 811 are used for leading out a cable of the displacement sensor 4 to the outside of the cylinder body 1.

In this embodiment, referring to fig. 1, the first wiring groove 23 of the piston 2 is communicated with the second wiring groove 811 of the rotation preventing cover 81, and the second wiring groove 811 is communicated with the outside for cable wiring of the displacement sensor 4.

Optionally, the hydraulic cylinder further comprises a telescopic dust cover 10, and the telescopic dust cover 10 is installed between the cylinder cover 3 and the anti-rotation cover plate 81.

In this embodiment, referring to fig. 1, the telescopic dust cover 10 is mounted on the cylinder head 3 and the rotation-preventing cover plate 81 at two ends thereof, respectively, so as to prevent dust when the piston 2 reciprocates.

Optionally, the hydraulic cylinder further comprises a cover plate 91, a shaft 92, a shaft sleeve 93 and a hollow block 94, wherein the cover plate 91 is connected to the piston 2, the shaft 92 is connected to the cover plate 91, the shaft 92 is vertically arranged relative to the cover plate 91, the hollow block 94 is arranged on the cylinder body 1, the shaft sleeve 93 is arranged on the inner wall of the hollow block 94, and the shaft 92 penetrates through the shaft sleeve 93.

In the present embodiment, referring to fig. 2, there is another embodiment for limiting the relative rotation between the cylinder 1 and the piston 2, specifically, the cover plate 91 can be mounted on the outer end surface of the piston 2 by bolts (reverse direction of Z axis in fig. 1), the shaft 92 can be mounted on one end of the cover plate 91 vertically (direction of Z axis in fig. 1) by bolts, the hollow block 94 can be welded (or bolted or clamped) on the cylinder 1, the hollow block 94 is slidably connected on the shaft 92 by a sleeve 93, the hollow block 94 can only slide on the shaft 92 in direction of Z axis, the hollow block 94 is connected with the cylinder 1 as a whole, the cover plate 91 is connected with the shaft 92 and the piston 2 as a whole, thereby forming the mechanism for limiting the relative rotation between the cylinder 1 and the piston 2.

In other embodiments, as shown in fig. 3, the relative rotation between the cylinder 1 and the piston 2 may also be limited by installing a pin, which is not limited herein and is specifically selected according to actual situations. In addition, the hollow block 94 can also be mounted on the cylinder head 3, i.e. the hollow block 94 is connected with the cylinder body 1 and the cylinder head 3 as a whole.

Optionally, the cylinder body 1 is provided with a boss 11 for adapting to the shape of the bottom end face of the mill housing.

In this embodiment, as shown in fig. 1, the boss 11 of the cylinder body 1 and the lower end surface of the mill housing may be fixed by a stud and a nut, and the boss 11 may be cylindrical and is used to be embedded into the end surface of the bottom of the mill housing, so as to ensure the installation accuracy of the hydraulic cylinder and limit the movement of the hydraulic cylinder in the horizontal direction.

In other embodiments, the shape of the boss 11 may also be a square or other shape, and only needs to be matched with the bottom end face of the mill housing, which is not limited herein and is specifically selected according to actual conditions.

The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" and "second" may explicitly or implicitly include at least one of the feature.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims (10)

1. A hydraulic cylinder, comprising: the cylinder comprises a cylinder body (1), a piston (2), a displacement sensor (4) and a guide pillar (5), wherein the piston (2) is arranged in the cylinder body (1), a first groove (21) is formed in one end face of the piston (2), a second groove (22) is formed in the other end face of the piston (2), the guide pillar (5) is located in the first groove (21) and connected to the cylinder body (1), the displacement sensor (4) is arranged in the second groove (22), the displacement sensor (4) comprises an induction rod (41) and a magnetic ring (42), the induction rod (41) penetrates through an internal oil way of the guide pillar (5), the induction rod (41) is sleeved with the magnetic ring (42), and the magnetic ring (42) is connected to one end, close to the displacement sensor (4), of the guide pillar (5).

2. The hydraulic cylinder according to claim 1, further comprising a first oil path block (61), wherein the first oil path block (61) is disposed on the cylinder body (1), the first oil path block (61) is opened with a first oil hole, the first oil hole is communicated with an internal oil path of the cylinder body (1), and the internal oil path of the cylinder body (1) is communicated with an internal oil path of the guide post (5).

3. The hydraulic cylinder according to claim 1, further comprising a concave spherical pad (71), the concave spherical pad (71) being mounted in the second groove (22) such that the displacement sensor (4) is sealingly arranged in the second groove (22).

4. The hydraulic cylinder according to claim 3, characterized by further comprising a convex spherical pad (72) and a fixed ring (73), said convex spherical pad (72) being mounted to the end face of the piston (2) close to said concave spherical pad (71) by said fixed ring (73), a gap being left between said convex spherical pad (72) and said fixed ring (73) for eliminating part of the radial force.

5. The hydraulic cylinder according to claim 1, further comprising a second oil path block (62) and a cylinder head (3), wherein the cylinder head (3) is connected to the cylinder body (1), the second oil path block (62) is disposed on the cylinder head (3), the second oil path block (62) is opened with a second oil hole, the second oil hole is communicated with an internal oil path of the cylinder head (3), and the internal oil path of the cylinder head (3) is communicated with the inside of the cylinder body (1).

6. The hydraulic cylinder according to claim 5, further comprising an anti-rotation cover plate (81) and an anti-rotation sliding plate (82), wherein the anti-rotation cover plate (81) is installed on the end surface of the piston (2) close to the cylinder cover (3), the anti-rotation sliding plate (82) is installed on one end of the anti-rotation cover plate (81) close to the second oil way block (62), the anti-rotation sliding plate (82) is vertically arranged relative to the anti-rotation cover plate (81), a sliding groove (83) is formed in the anti-rotation sliding plate (82), and the second oil way block (62) is slidably connected to the sliding groove (83).

7. The hydraulic cylinder according to claim 6, characterized in that the piston (2) is provided with a first wiring groove (23), the anti-rotation cover plate (81) is provided with a second wiring groove (811) which is communicated with the first wiring groove (23), and the first wiring groove (23) and the second wiring groove (811) are used for leading out a cable of the displacement sensor (4) to the outside of the cylinder body (1).

8. Hydraulic cylinder according to claim 6, characterized in that it further comprises a telescopic dust cover (10), said telescopic dust cover (10) being mounted between the cylinder head (3) and the anti-rotation cover plate (81).

9. The hydraulic cylinder according to claim 1, characterized by further comprising a cover plate (91), a shaft (92), a shaft sleeve (93) and a hollow block (94), wherein the cover plate (91) is connected to the piston (2), the shaft (92) is connected to the cover plate (91), the shaft (92) is vertically arranged relative to the cover plate (91), the hollow block (94) is arranged on the cylinder body (1), the shaft sleeve (93) is mounted to the inner wall of the hollow block (94), and the shaft (92) is arranged through the shaft sleeve (93).

10. Hydraulic cylinder according to claim 1, characterized in that the cylinder block (1) is provided with a boss (11) for adapting to the shape of the bottom end face of the mill housing.

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