Anvil moving platform oil cylinder replacement tool and replacement method thereof

Abstract

The invention discloses an anvil moving oil cylinder replacing tool and a replacing method thereof.The anvil moving oil cylinder replacing tool comprises an upper beam and two wheel seats, the upper beam is sleeved with an oil cylinder fixing hoop capable of sliding in the axial direction of the upper beam, the bottom of each wheel seat is provided with two or more idler wheels in a linear extending mode, and rolling shafts of the idler wheels are parallel to one another; the ends, in the extending direction of the idler wheels, of the wheel seats are hinged to one ends of the upper connecting rods, the other ends, in the extending direction of the idler wheels, of the wheel seats are hinged to the cylinder body ends of the lifting oil cylinders, and one end of the upper beam is hinged to the other ends of the upper connecting rods on one wheel seat and the telescopic ends of the lifting oil cylinders at the same time. And the other end of the upper beam is simultaneously hinged with the other end of the upper connecting rod on the other wheel seat and the telescopic end of the lifting oil cylinder. The anvil moving platform oil cylinder replacing tool can improve the working efficiency and reduce the labor load.

Description

Technical Field

[0001] The invention relates to the technical field of anvil shifting platform maintenance, and in particular to an anvil shifting platform oil cylinder replacement tooling, and an anvil shifting platform oil cylinder replacement method using the tooling. Background Art

[0002] During the forging process of the press, the replacement of production tools such as flat anvils and knife anvils is mainly achieved through the oil cylinder equipment on the anvil transfer table. The oil cylinder equipment is installed on the anvil transfer table frame, and an operating room is provided above, so that the oil cylinder equipment is located in a small space at the bottom of the operating room. Therefore, the surrounding space of the oil cylinder equipment is not only limited, but there is no available lifting point above, which makes it inconvenient to lift the oil cylinder equipment. When dismantling and installing the oil cylinder equipment, it is difficult to lift the oil cylinder equipment in and out, and the operation efficiency is relatively low.

[0003] At present, the construction process and specific methods of disassembly and assembly of oil cylinder equipment are as follows: 1. Remove the dust cover and drag plate of the oil cylinder equipment; 2. Remove the oil pipe and anchor bolts of the oil cylinder equipment; 3. Use hydraulic jack to lift the oil cylinder equipment; 4. Install sliding devices such as steel pipes at the bottom of the oil cylinder equipment; 5. Use the outer hand chain hoist to horizontally shift the oil cylinder equipment. After moving the oil cylinder equipment to the outside, use the crane in the factory to lift the oil cylinder equipment; and when reinstalling, use the above-mentioned disassembly method and the reverse steps to reinstall the oil cylinder equipment.

[0004] Obviously, this method performs lifting operations on the cylinder equipment, but because personnel need to remove the anchor bolts of the anvil table cylinder equipment and horizontally move the cylinder equipment in a small space, and use steel pipes and other devices as tools for the horizontal sliding of the cylinder equipment, it is easy to cause deflection and the operation efficiency is relatively low. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an anvil table cylinder replacement tool that can improve working efficiency and reduce labor load.

[0006] The present invention adopts the following technical solution:

[0007] The present invention provides a tool for replacing anvil table cylinder, comprising an upper beam and two wheel seats, wherein the upper beam is sleeved with a cylinder fixing hoop which can slide axially along the upper beam, and the bottom of the wheel seat is provided with more than two rollers extending in a straight line, and the rolling axis of each roller is parallel to each other, and one end of the wheel seat in the extending direction of the roller is hinged to one end of the upper connecting rod, and the other end of the wheel seat in the extending direction of the roller is hinged to the cylinder body end of the lifting cylinder, and one end of the upper beam is simultaneously hinged to the other end of the upper connecting rod on one wheel seat and the telescopic end of the lifting cylinder, and the other end of the upper beam is simultaneously hinged to the other end of the upper connecting rod on the other wheel seat and the telescopic end of the lifting cylinder.

[0008] Preferably, the upper beam includes a sleeve section in the middle part and connecting sections at both end parts. The connecting section is a threaded section, and the radius of the connecting section is smaller than the radius of the sleeve section. A mounting sleeve is sleeved on the connecting section. Nuts capable of blocking the mounting sleeve are respectively screwed on both axial sides of the mounting sleeve. The telescopic ends of the upper connecting rod and the lifting cylinder are both hinged on the mounting sleeve.

[0009] Preferably, the wheel seat includes a lower connecting rod, a roller and one end of an upper connecting rod are simultaneously hinged to one end of the lower connecting rod, and a roller and a cylinder end of a lifting cylinder are simultaneously hinged to the other end of the lower connecting rod.

[0010] Preferably, the cylinder fixing hoop includes a connecting block, an upper half hoop and a lower half hoop, the connecting block is sleeved on the upper beam and can slide axially along the upper beam, the upper half hoop is detachably connected to the connecting block, and the lower half hoop is detachably connected to the upper half hoop to form a complete hoop structure, the hoop mouth radius of the hoop structure is adapted to the radius of the cylinder equipment, and the hoop mouth axis of the hoop structure is criss-crossed with the axis of the upper beam.

[0011] The present invention also provides a method for replacing anvil table oil cylinder, which uses the above-mentioned anvil table oil cylinder replacement tool and includes the following steps:

[0012] S1: Remove the protective cover, drag plate, oil pipe and anchor bolts of the oil cylinder equipment to be repaired on the moving anvil platform, place the oil cylinder replacement tooling of the moving anvil platform on the moving anvil platform, and make the rollers on the two wheel seats of the oil cylinder replacement tooling of the moving anvil platform be located in the slideways on both sides of the moving anvil platform respectively, and the oil cylinder fixing hoop is set on the oil cylinder equipment to be repaired;

[0013] S2: Start the lifting cylinder to lift the cylinder equipment to be repaired, and move the cylinder equipment to be repaired together with the anvil table cylinder replacement tooling to the outside of the operating room through the hand chain hoist located outside the operating room. After controlling the lifting cylinder to fall back and releasing the connection between the cylinder fixing hoop and the cylinder equipment to be repaired, lift the cylinder equipment to be repaired away through the crane in the factory building;

[0014] S3: The overhauled cylinder equipment is hoisted by the crane in the factory, and the overhauled cylinder equipment is connected to the anvil transfer platform cylinder replacement tooling through the cylinder fixing hoop. After the lifting cylinder is started to lift the overhauled cylinder equipment, the overhauled cylinder equipment is pushed together with the anvil transfer platform cylinder replacement tooling into the lower space of the operating room, so that the rollers on the two wheel seats of the anvil transfer platform cylinder replacement tooling are respectively located in the slideways on both sides of the anvil transfer platform, and then the lifting cylinder is started to put the overhauled cylinder equipment into place;

[0015] S4: Release the connection between the cylinder fixing hoop and the overhauled cylinder equipment, move the anvil platform cylinder replacement tooling to the outside of the operating room through the hand winch located outside the operating room, and reinstall the protective cover, drag plate, oil pipe and anchor bolts of the overhauled cylinder equipment on the anvil platform.

[0016] Preferably, the initial state of the anvil platform cylinder replacement tooling is a split state. In step S1, the anvil platform cylinder replacement tooling is first assembled outside the operating room, and then the assembled anvil platform cylinder replacement tooling is placed on the anvil platform; in step S4, after the protective cover, drag plate, oil pipe and anchor bolts of the cylinder equipment that have been overhauled on the anvil platform are reinstalled, the assembly state of the anvil platform cylinder replacement tooling is released.

[0017] Preferably, two anvil platform cylinder replacement tools are used in total, one anvil platform cylinder replacement tool is used to connect with the head side of the cylinder device, and the other anvil platform cylinder replacement tool is used to connect with the tail side of the cylinder device.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The anvil platform cylinder replacement tool of the present invention is limited in the slideways on both sides of the anvil platform by two wheel seats, is connected to the cylinder equipment clamp on the anvil platform by the cylinder fixing clamp, and lifts the cylinder equipment by the lifting cylinder. Compared with the conventional method of hydraulic jacking, steel pipe and other sliding devices to move the cylinder equipment, the anvil platform cylinder replacement tool of the present invention not only integrates the functions of hydraulic jack and steel pipe and other sliding devices, reducing the labor load, but also because of the limitation between the anvil platform and the anvil platform, the disassembly and reinstallation of the cylinder equipment no longer requires additional position correction, thereby improving the working efficiency.

[0020] The anvil table oil cylinder replacement method of the present invention naturally has the above-mentioned beneficial effects due to the use of the above-mentioned anvil table oil cylinder replacement tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the use status of the anvil table cylinder replacement tooling in an embodiment of the present invention.

[0022] Figure 2 It is a structural schematic diagram of an upper beam on anvil table oil cylinder replacement tooling in an embodiment of the present invention.

[0023] Figure 3 It is a schematic structural diagram of a cylinder fixing hoop on anvil table cylinder replacement tooling in an embodiment of the present invention.

[0024] The reference numerals are described as follows:

[0025] 1. Upper beam 24, lower connecting rod

[0026] 11. Socket section 3, cylinder fixing hoop

[0027] 12. Connecting segment 31. Connecting block

[0028] 2. Wheel seat 32, upper hoop

[0029] 21, roller 33, lower half hoop

[0030] 22. Upper connecting rod 4, slideway

[0031] 23. Lifting cylinder 5. Cylinder equipment DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0036] See also Figure 1The present embodiment provides a tool for replacing anvil cylinder, comprising an upper beam 1 and two wheel seats 2. The upper beam 1 is provided with a cylinder fixing hoop 3 which can slide axially along the upper beam 1. Two or more rollers 21 are arranged along a straight line at the bottom of the wheel seat 2, and the rolling axes of each roller 21 are parallel to each other. One end of the wheel seat 2 in the extension direction of the roller 21 is hinged to one end of the upper connecting rod 22, and the other end of the wheel seat 2 in the extension direction of the roller 21 is hinged to the cylinder body end of the lifting cylinder 23. One end of the upper beam 1 is simultaneously hinged to the other end of the upper connecting rod 22 on one wheel seat 2 and the telescopic end of the lifting cylinder 23, and the other end of the upper beam 1 is simultaneously hinged to the other end of the upper connecting rod 22 on another wheel seat 2 and the telescopic end of the lifting cylinder 23.

[0037] The anvil platform cylinder replacement tool of the present embodiment is limited in the slideway 4 on both sides of the anvil platform by two wheel seats 2, is connected to the cylinder equipment 5 on the anvil platform by the cylinder fixing hoop 3, and lifts the cylinder equipment 5 by the lifting cylinder 23. Compared with the conventional method of hydraulic jacking, steel pipe and other sliding devices to realize the movement of the cylinder equipment 5, the anvil platform cylinder replacement tool of the present embodiment not only integrates the functions of hydraulic jacking and steel pipe and other sliding devices to reduce the labor load, but also because of the limitation between the anvil platform, the disassembly and reinstallation of the cylinder equipment 5 no longer requires additional position correction, thereby improving the working efficiency.

[0038] At the same time, the cylinder fixing hoop 3 on the anvil platform cylinder replacement tool of this embodiment can be slidably sleeved on the upper beam 1 along the axial direction of the upper beam 1, so that the setting position of the cylinder fixing hoop 3 can be flexibly adjusted.

[0039] Preferably, see Figure 2 The upper beam includes a sleeve section 11 in the middle part and connecting sections 12 at both ends. The connecting section 12 is a threaded section, and the radius of the connecting section 12 is smaller than the radius of the sleeve section 11. A mounting sleeve is sleeved on the connecting section 12. Nuts capable of blocking the mounting sleeve are respectively screwed on both axial sides of the mounting sleeve of the connecting section 12. The telescopic ends of the upper connecting rod 22 and the lifting cylinder 23 are both hinged on the mounting sleeve.

[0040] The anvil shifting platform cylinder replacement tool of the present embodiment can flexibly adjust the maximum distance between the two wheel seats 2 according to the distance between the slideways 4 on both sides of the anvil shifting platform by adjusting the rotational position of the nut on the connecting section 12, so that the anvil shifting platform cylinder replacement tool of the present embodiment can be used on anvil shifting platform equipment of different specifications.

[0041] Preferably, see Figure 1 The wheel seat 2 includes a lower connecting rod 24, a roller 21 and one end of an upper connecting rod 22 are hinged to one end of the lower connecting rod 24 at the same time, and a roller 21 and a cylinder end of a lifting cylinder 23 are hinged to the other end of the lower connecting rod 24 at the same time, so as to facilitate the disassembly of the roller 21, the upper connecting rod 22 and the lifting cylinder 23.

[0042] Preferably, see Figure 3 The oil cylinder fixing hoop 3 includes a connecting block 31, an upper hoop 32 and a lower hoop 33. The connecting block 31 is sleeved on the upper beam 1 and can slide axially along the upper beam 1. The upper hoop 32 is detachably connected to the connecting block 31, and the lower hoop 33 is detachably connected to the upper hoop 32 to form a complete hoop structure. The hoop mouth radius of the hoop structure is adapted to the radius of the oil cylinder equipment 5, and the hoop mouth axis of the hoop structure is crisscrossed with the axis of the upper beam 1.

[0043] When it is necessary to set the cylinder fixing hoop 3 on the cylinder device 5 of the anvil moving platform, the cylinder fixing hoop 3 can be successfully set on the cylinder device 5 of the anvil moving platform by releasing the detachable connection between the upper hoop 32 and the lower hoop 33, and making the inner ring surface of the upper hoop 32 fit with the upper part of the cylinder device 5, and the inner ring surface of the lower hoop 33 fit with the lower part of the cylinder device 5, and then removably connecting the upper hoop 32 and the lower hoop 33 again.

[0044] It should be noted that when replacing the cylinder device 5 with a diameter of 220 mm, the carrying capacity of the anvil table cylinder replacement tooling of this embodiment needs to reach 6 tons; the lifting stroke of the lifting cylinder 23 needs to reach 150 mm.

[0045] Combination Figure 1 This embodiment also provides a method for replacing anvil table oil cylinder, using the above-mentioned anvil table oil cylinder replacement tool, and comprising the following steps:

[0046] S1: Remove the protective cover, drag plate, oil pipe and anchor bolts of the oil cylinder equipment 5 to be repaired on the moving anvil platform, place the oil cylinder replacement tool of the moving anvil platform on the moving anvil platform, and make the rollers 21 on the two wheel seats 2 of the oil cylinder replacement tool of the moving anvil platform respectively located in the slideways 4 on both sides of the moving anvil platform, and the oil cylinder fixing hoop 3 is set on the oil cylinder equipment 5 to be repaired;

[0047] S2: Start the lifting cylinder 23 to lift the cylinder equipment 5 to be repaired, and move the cylinder equipment 5 to be repaired together with the anvil table cylinder replacement tooling to the outside of the operating room through the hand chain hoist located outside the operating room, and after controlling the lifting cylinder 23 to fall back and releasing the connection between the cylinder fixing hoop 3 and the cylinder equipment 5 to be repaired, lift the cylinder equipment 5 to be repaired away by the crane in the factory building;

[0048] S3: The overhauled cylinder device 5 is hoisted by the crane in the factory, and the overhauled cylinder device 5 is connected to the anvil transfer platform cylinder replacement tooling through the cylinder fixing hoop 3. After the overhauled cylinder device 5 is lifted by starting the lifting cylinder 23, the overhauled cylinder device 5 is pushed together with the anvil transfer platform cylinder replacement tooling into the lower space of the operating room, so that the rollers 21 on the two wheel seats 2 of the anvil transfer platform cylinder replacement tooling are respectively located in the slideways 4 on both sides of the anvil transfer platform, and then the lifting cylinder 23 is started to put the overhauled cylinder device 5 into place;

[0049] S4: Release the connection between the cylinder fixing hoop 3 and the overhauled cylinder equipment 5, move the anvil platform cylinder replacement tooling to the outside of the operating room through the hand winch located outside the operating room, and reinstall the protective cover, drag plate, oil pipe and anchor bolts of the overhauled cylinder equipment 5 on the anvil platform.

[0050] The anvil platform cylinder replacement method of this embodiment adopts the above-mentioned anvil platform cylinder replacement tooling, thereby greatly improving the construction efficiency of the anvil platform cylinder replacement operation.

[0051] Preferably, the initial state of the anvil platform cylinder replacement tooling is a split state. In step S1, the anvil platform cylinder replacement tooling is first assembled outside the operating room, and then the assembled anvil platform cylinder replacement tooling is placed on the anvil platform; in step S4, after reinstalling the protective cover, drag plate, oil pipe and anchor bolts of the cylinder equipment 5 that have been overhauled on the anvil platform, the assembly state of the anvil platform cylinder replacement tooling is released.

[0052] Preferably, two anvil platform cylinder replacement tools are used in total, one anvil platform cylinder replacement tool is used to connect with the head side of the cylinder device 5, and the other anvil platform cylinder replacement tool is used to connect with the tail side of the cylinder device 5.

[0053] Since the cylinder equipment of the anvil moving platform itself is relatively heavy, two anvil moving platform cylinder replacement tools are used to support the head and tail sides of the cylinder equipment 5. This can reduce the load on a single anvil moving platform cylinder replacement tool and extend the service life of the anvil moving platform cylinder replacement tool; it also facilitates the safe implementation of the anvil moving platform cylinder replacement method of this embodiment.

[0054] The above-mentioned anvil platform cylinder replacement tooling and replacement method can solve the problem of how to improve the disassembly and assembly efficiency of the anvil platform cylinder equipment and reduce the labor load in a confined space; and it has been put into practical use in the 45MN fast forging machine anvil platform cylinder replacement project of Daye Special Steel Forging Plant. The use of this tooling and method has greatly improved the construction efficiency and created considerable economic benefits.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A tool for replacing anvil table cylinder, characterized in that: The invention comprises an upper beam (1) and two wheel seats (2), wherein the upper beam (1) is sleeved with a cylinder fixing hoop (3) capable of axially sliding along the upper beam (1), and the bottom of the wheel seat (2) is provided with more than two rollers (21) extending in a straight line, and the rolling axes of each roller (21) are parallel to each other, and one end of the wheel seat (2) in the extending direction of the roller (21) is hinged to one end of an upper connecting rod (22), and the other end of the wheel seat (2) in the extending direction of the roller (21) is hinged to the cylinder body end of a lifting cylinder (23), and one end of the upper beam (1) is simultaneously hinged to the other end of the upper connecting rod (22) on one of the wheel seats (2) and the telescopic end of the lifting cylinder (23), and the other end of the upper beam (1) is simultaneously hinged to the other end of the upper connecting rod (22) on another of the wheel seats (2) and the telescopic end of the lifting cylinder (23).

2. The anvil table oil cylinder replacement tool according to claim 1 is characterized in that: The upper beam (1) comprises a sleeve section (11) in the middle part and connecting sections (12) at both end parts, the connecting section (12) is a threaded section, and the radius of the connecting section (12) is smaller than the radius of the sleeve section (11), a mounting sleeve is sleeved on the connecting section (12), nuts capable of blocking the mounting sleeve are respectively screwed on both axial sides of the mounting sleeve of the connecting section (12), and the telescopic ends of the upper connecting rod (22) and the lifting cylinder (23) are both hinged on the mounting sleeve.

3. The anvil table oil cylinder replacement tool according to claim 1 is characterized in that: The wheel seat (2) comprises a lower connecting rod (24), one end of a roller (21) and an upper connecting rod (22) are simultaneously hinged to one end of the lower connecting rod (24), and one end of a roller (21) and a cylinder end of a lifting cylinder (23) are simultaneously hinged to the other end of the lower connecting rod (24).

4. The anvil table oil cylinder replacement tool according to claim 1, characterized in that: The oil cylinder fixing hoop (3) comprises a connecting block (31), an upper hoop (32) and a lower hoop (33); the connecting block (31) is sleeved on the upper beam (1) and can slide axially along the upper beam (1); the upper hoop (32) is detachably connected to the connecting block (31); the lower hoop (33) is detachably connected to the upper hoop (32) to form a complete hoop structure; the hoop opening radius of the hoop structure is compatible with the radius of the oil cylinder device (5); and the hoop opening axis of the hoop structure is in a crisscrossed state with the axis of the upper beam (1).

5. A method for replacing anvil table cylinder, characterized in that: The anvil table oil cylinder replacement tooling according to any one of claims 1 to 4 is used, and comprises the following steps: S1: Remove the protective cover, drag plate, oil pipe and anchor bolts of the oil cylinder equipment (5) to be repaired on the moving anvil platform, place the oil cylinder replacement tool of the moving anvil platform on the moving anvil platform, and make the rollers (21) on the two wheel seats (2) of the oil cylinder replacement tool of the moving anvil platform be respectively located in the slideways (4) on both sides of the moving anvil platform, and the oil cylinder fixing hoop (3) is set on the oil cylinder equipment (5) to be repaired; S2: Start the lifting cylinder (23) to lift the cylinder equipment (5) to be repaired, and move the cylinder equipment (5) to be repaired together with the cylinder replacement tooling of the anvil table to the outside of the operating room through the hand chain hoist located outside the operating room, and after controlling the lifting cylinder (23) to fall back and releasing the connection between the cylinder fixing hoop (3) and the cylinder equipment (5) to be repaired, lift the cylinder equipment (5) to be repaired away by the crane in the factory building; S3: The overhauled cylinder equipment (5) is hoisted by the crane in the factory, and the overhauled cylinder equipment (5) is connected to the anvil transfer platform cylinder replacement tooling through the cylinder fixing hoop (3). After the lifting cylinder (23) is started to lift the overhauled cylinder equipment (5), the overhauled cylinder equipment (5) is pushed together with the anvil transfer platform cylinder replacement tooling into the lower space of the operating room, so that the rollers (21) on the two wheel seats (2) of the anvil transfer platform cylinder replacement tooling are respectively located in the slideways (4) on both sides of the anvil transfer platform, and then the lifting cylinder (23) is started to put the overhauled cylinder equipment (5) into place; S4: Release the connection between the oil cylinder fixing hoop (3) and the oil cylinder equipment (5) that has been repaired, move the oil cylinder replacement tooling of the moving anvil platform to the outside of the operating room through the hand winch located outside the operating room, and reinstall the protective cover, drag plate, oil pipe and anchor bolts of the oil cylinder equipment (5) that has been repaired on the moving anvil platform.

6. The method for replacing the anvil table cylinder according to claim 5, characterized in that: The initial state of the anvil transfer platform oil cylinder replacement tool is a split state. In step S1, the anvil transfer platform oil cylinder replacement tool is first assembled outside the operating room, and then the assembled anvil transfer platform oil cylinder replacement tool is placed on the anvil transfer platform; In step S4, after the protective cover, the drag plate, the oil pipe and the anchor bolts of the oil cylinder equipment (5) that have been overhauled on the anvil transfer platform are reinstalled, the assembly state of the oil cylinder replacement tooling of the anvil transfer platform is released.

7. The method for replacing the anvil table cylinder according to claim 5, characterized in that: A total of two anvil shifting platform cylinder replacement tools are used, one of which is used to connect to the head side of the cylinder device (5), and the other of which is used to connect to the tail side of the cylinder device (5).

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