Compressor crosshead and piston rod connecting tool and connecting method

Abstract

The invention relates to the technical field of compressors, in particular to a compressor crosshead and piston rod connecting tool and a connecting method.The compressor crosshead and piston rod connecting tool comprises a plurality of arc-shaped wrenching assemblies, and each arc-shaped wrenching assembly comprises an arc-shaped steel ring provided with a wrench mounting hole, and connecting structures are arranged at the two ends of the arc-shaped steel ring; the at least one rod wrench is arranged in the wrench mounting hole in a penetrating manner, one end of the rod wrench is positioned on the inner side of the arc-shaped steel ring, and the other end of the rod wrench is positioned on the outer side of the arc-shaped steel ring; in the wrenching working condition, the arc-shaped wrenching assemblies are held on the adjusting ring, the ends, located on the inner sides of the arc-shaped steel rings, of the rod wrenches are inserted into the blind holes in the adjusting ring, the multiple arc-shaped wrenching assemblies are connected in a butt joint mode through the connecting structures, and a wrenching wheel disc covering the adjusting ring is formed. The problems that time and labor are wasted and efficiency is low when an existing crosshead and a piston rod are connected can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a connecting tool and a connecting method for a compressor crosshead and a piston rod. Background Art

[0002] A reciprocating compressor is a compressor that realizes the pressurization and transportation of gas by the reciprocating movement of a piston or a diaphragm in a cylinder. A crosshead is a part connecting a piston and a connecting rod in a reciprocating compressor and has a guiding function.

[0003] During the use of a reciprocating compressor, it is necessary to overhaul the reciprocating compressor. During the overhaul, it is often necessary to remove or interconnect the crosshead and the piston rod. Usually, the piston rod and the crosshead are connected by threads. Since the weight of the piston rod and the piston connected to the piston rod is relatively large, there is a large resistance when screwing the piston rod into or out of the crosshead. Currently, a bar wrench or a hook wrench is usually inserted into the blind hole on the adjusting ring to turn the piston rod for tightening or disassembly. Due to the limited space in the slideway of the crosshead, the angle that can be turned when using the wrench is relatively small, and it is necessary to frequently insert and pull out the wrench and insert it into the blind hole on the adjusting ring to turn the piston rod for tightening or disassembly, resulting in time-consuming and laborious connection between the crosshead and the piston rod and low efficiency. Summary of the Invention

[0004] An embodiment of the present invention provides a connecting tool and a connecting method for a compressor crosshead and a piston rod, which can solve the problems of time-consuming, laborious and low efficiency existing in the connection between the existing crosshead and the piston rod.

[0005] In a first aspect, an embodiment of the present application provides a connecting tool for a compressor crosshead and a piston rod, including a plurality of arc-shaped turning components, and the arc-shaped turning components include:

[0006] An arc-shaped steel ring, on which a wrench mounting hole is provided, and connection structures are provided at both ends thereof;

[0007] At least one bar wrench, which is inserted into the wrench mounting hole, with one end located inside the arc-shaped steel ring and the other end located outside the arc-shaped steel ring;

[0008] In a turning working condition, the arc-shaped turning component is held on the adjusting ring, and the end of the bar wrench located inside the arc-shaped steel ring is inserted into the blind hole on the adjusting ring. The plurality of arc-shaped turning components are butt-connected through the connection structure to form a turning wheel disc covering the adjusting ring.

[0009] In some embodiments, the plurality of arc-shaped turning components are two arc-shaped turning components, and the radian of the arc-shaped steel ring of the arc-shaped turning component is 90 degrees.

[0010] In some embodiments, the at least one bar wrench is two bar wrenches, the included angle between the two bar wrenches is 90 degrees, and the included angle between the bar wrench and the end face of the arc-shaped steel ring is 45 degrees.

[0011] In some embodiments, the connection structure includes a connecting plate and connecting bolts. The connecting plate is arranged at the end of the arc-shaped steel ring and extends radially outward along the arc-shaped steel ring. A connecting hole is provided on the connecting plate, and multiple arc-shaped actuating components are connected through the connecting plate and the connecting bolts.

[0012] In some embodiments, the arc-shaped steel ring is a hollow structure.

[0013] In some embodiments, the arc-shaped actuating component further includes an auxiliary wrench, and the auxiliary wrench is arranged outside the arc-shaped steel ring.

[0014] In some embodiments, the materials of the arc-shaped steel ring and the bar wrench are stainless steel, or alloy steel, or carbon steel.

[0015] In a second aspect, an embodiment of the present application provides a method for connecting a compressor crosshead and a piston rod, which is applied to the compressor crosshead and piston rod connecting tool described in any one of the embodiments in the first aspect, and includes:

[0016] Hold the arc-shaped actuating component on the adjusting ring, and insert the end of the bar wrench located inside the arc-shaped steel ring into the blind hole on the adjusting ring.

[0017] Connect multiple arc-shaped actuating components through the connection structure in a butt joint manner to form a actuating wheel disc covering the adjusting ring.

[0018] Actuate the actuating wheel disc to screw the piston rod into or out of the crosshead.

[0019] In some embodiments, before holding the arc-shaped actuating component on the adjusting ring and inserting the end of the bar wrench located inside the arc-shaped steel ring into the blind hole on the adjusting ring, it further includes:

[0020] Remove the locking nut arranged outside the adjusting ring.

[0021] In some embodiments, after actuating the actuating wheel disc to screw the piston rod into or out of the crosshead, it further includes:

[0022] Install the locking nut arranged outside the adjusting ring.

[0023] Compared with the prior art, in the embodiment of the present application, the arc-shaped actuating assembly is held on the adjusting ring, and one end of the rod wrench located inside the arc-shaped steel ring is inserted into the blind hole on the adjusting ring. A plurality of the arc-shaped actuating assemblies are butt-connected through the connecting structure to form a actuating wheel disc covering the adjusting ring, so that when screwing the piston rod into or out of the crosshead, it is possible to avoid frequently inserting and pulling out the wrench from the blind hole on the adjusting ring. By rotating the actuating wheel disc, the piston rod can be screwed into or out of the crosshead, and it can meet the requirement that multiple people rotate the actuating wheel disc simultaneously, saving time and effort and improving work efficiency. Description of the Drawings

[0024] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the drawings.

[0025] Figure 1 It is a schematic structural diagram of a connecting tool for a compressor crosshead and a piston rod provided by an embodiment of the present invention;

[0026] Figure 2 It is a schematic connection diagram of a compressor crosshead and a piston rod provided by an embodiment of the present invention;

[0027] Figure 3 It is a flowchart of a method for connecting a compressor crosshead and a piston rod provided by an embodiment of the present invention.

[0028] Reference Signs:

[0029] 10. Arc-shaped actuating assembly; 110. Arc-shaped steel ring; 1101. Connecting plate; 1102. Connecting bolt; 120. Rod wrench;

[0030] 20. Auxiliary wrench;

[0031] 30. Piston rod;

[0032] 40. Adjusting ring;

[0033] 50. Locking nut. Detailed Embodiments

[0034] The present invention will be further described below with reference to the drawings.

[0035] A reciprocating compressor refers to a compressor that realizes the pressurization and transportation of gas by the reciprocating motion of a piston or diaphragm in a cylinder, causing the volume of the cylinder to change periodically. It belongs to a positive displacement compressor. According to the reciprocating component, it is divided into piston-type and diaphragm-type compressors. The crosshead is a part connecting the piston and the connecting rod in a reciprocating compressor and has a guiding function.

[0036] A reciprocating compressor is mainly composed of a cylinder, a piston, a connecting rod, a crosshead, a crankshaft and other components. Its working principle is that under the drive of the crankshaft, the connecting rod and the piston make reciprocating motion together, so that the gas is continuously compressed in the cylinder, thereby achieving the purpose of increasing the gas pressure. During the use of large reciprocating compressors, the components of the compressor may fail and need to be repaired or replaced. Among them, the crosshead, as one of the key components of the compressor, is prone to failure. The crosshead is usually connected to the piston through the piston rod. At this time, the crosshead needs to be separated from the piston rod and installed together after the inspection is completed. Since the piston rod and piston connected to the crosshead are heavy, there is a large resistance when screwing out or screwing in the crosshead, and it is usually used The rod wrench is inserted into the 12 blind holes evenly distributed on the adjustment circle for turning, or it can be turned through the hook wrench, but the space of the crosshead slide is limited, the turning angle is small, the turning angle of the rod wrench is about 90°, and the turning angle of the hook wrench is only about 60°. It needs to be pulled out after turning once, and then readjusted and inserted into the next blind hole to continue turning. Each adjustment of the wrench takes a lot of time, and can only be done by one person with one wrench, the efficiency is very low, one disassembly and assembly takes about 4 hours, and it is easy to cause blind holes to open, parts to be damaged, and people to be injured.

[0037] In response to the above technical issues, such as Figure 1 , Figure 2 As shown, this embodiment provides a compressor crosshead and piston rod 30 connection tool, including a plurality of arc-shaped wrench assemblies 10, the arc-shaped wrench assemblies 10 including:

[0038] The arc-shaped steel ring 110 is provided with a wrench mounting hole and a connecting structure at both ends;

[0039] At least one rod wrench 120 is inserted into the wrench mounting hole, one end of which is located inside the arc-shaped steel ring 110, and the other end of which is located outside the arc-shaped steel ring 110;

[0040] During the pulling operation, the arc-shaped pulling assembly 10 is held on the adjustment ring 40, and the end of the rod wrench 120 located on the inner side of the arc-shaped steel ring 110 is inserted into the blind hole on the adjustment ring 40, and multiple arc-shaped pulling assemblies 10 are connected by a connecting structure to form a pulling wheel covering the adjustment ring 40.

[0041] It should be noted that the rod wrench 120 can be detachably arranged in the wrench mounting hole, such as by threaded connection, clamping, etc., or can be fixed in the wrench mounting hole, such as by welding. Usually, the portion of the rod wrench 120 located on the outside of the arc-shaped steel ring 110 is longer, which can increase the length of the force arm when the rod wrench 120 is manually pulled. The portion of the rod wrench 120 located on the inside of the arc-shaped steel ring 110 is shorter and can be fully inserted into the blind hole on the adjustment ring 40.

[0042] It should be noted that after connecting multiple arc actuating components 10 through the connecting structure to form a actuating wheel disc covering the adjustment ring 40, the rod wrench 120 on the actuating wheel disc can be actuated to screw the piston rod 30 into or out of the crosshead. Since there are multiple rod wrenches 120 on the actuating wheel disc, multiple people can simultaneously turn the actuating wheel disc, improving the installation or disassembly efficiency and saving time and effort.

[0043] It should be noted that since there are multiple arc actuating components 10 and rod wrenches 120 are provided on the arc actuating components 10, when turning the piston rod 30, the rod wrenches 120 on the multiple arc actuating components 10 are all inserted into the blind holes on the adjustment ring 40, that is, the force is applied through multiple blind holes, which can avoid the problem that the blind hole is overstressed and the blind hole is split when the existing rod wrench 120 or hook wrench is inserted into one blind hole for applying force.

[0044] In some embodiments, the multiple arc actuating components 10 are two arc actuating components 10, and the radian of the arc steel ring 110 of the arc actuating component 10 is 90 degrees.

[0045] It should be noted that usually two arc actuating components 10 are provided. When screwing the adjustment ring 40 into or out of the piston rod 30, the two arc actuating components 10 can be butted and connected and then the screwing-in or screwing-out operation can be carried out.

[0046] In some embodiments, at least one rod wrench 120 is two rod wrenches 120, the included angle between the two rod wrenches 120 is 90 degrees, and the included angle between the rod wrench 120 and the end face of the arc steel ring 110 is 45 degrees.

[0047] It should be noted that by making the included angle between the two rod wrenches 120 be 90 degrees and the included angle between the rod wrench 120 and the end face of the arc steel ring 110 be 45 degrees, after forming the actuating wheel disc, the rod wrenches 120 on the actuating wheel disc are evenly distributed in a circle, thus facilitating the turning of the actuating wheel disc.

[0048] It should be noted that multiple rod wrenches 120 can also be set according to actual needs, such as 3, 4, etc. When multiple rod wrenches 120 are set, the staff have more rod wrenches 120 to apply force. The multiple rod wrenches 120 are all inserted into the blind holes on the adjustment ring 40, and multiple force transmission points can be provided, which is not easy to cause the blind hole to split.

[0049] In some embodiments, the connecting structure includes a connecting plate 1101 and a connecting bolt 1102. The connecting plate 1101 is arranged at the end of the arc steel ring 110 and extends radially outward along the arc steel ring 110. Connecting holes are provided on the connecting plate 1101, and multiple arc actuating components 10 are connected through the connecting plate 1101 and the connecting bolt 1102.

[0050] It should be noted that by arranging the connecting plate 1101 on the outer side of the arc-shaped steel ring 110, it is convenient to connect when multiple arc-shaped actuating components 10 are docked. The connection between multiple arc-shaped actuating components 10 can also be carried out by other detachable methods such as buckles. The embodiments of the present application do not limit this.

[0051] In some embodiments, the arc-shaped steel ring 110 is a hollow structure.

[0052] It should be noted that by making the arc-shaped steel ring 110 a hollow structure, the weight of the arc-shaped steel ring 110 can be reduced, and the load on the staff can be reduced. The arc-shaped steel ring 110 can be a square tube or a round tube.

[0053] In some embodiments, the arc-shaped actuating component 10 further includes an auxiliary wrench 20, and the auxiliary wrench 20 is arranged on the outer side of the arc-shaped steel ring 110.

[0054] It should be noted that the auxiliary wrench 20 does not extend to the inner side of the arc-shaped steel ring 110 and is only arranged on the outer side of the arc-shaped steel ring 110 to facilitate the staff to turn the actuating wheel disc through the auxiliary wrench 20. The auxiliary wrench 20 and the bar wrench 120 can be evenly distributed on the actuating wheel disc, or can be flexibly arranged according to actual needs.

[0055] In some embodiments, the materials of the arc-shaped steel ring 110 and the bar wrench 120 are stainless steel, or alloy steel, or carbon steel.

[0056] It should be noted that making the materials of the arc-shaped steel ring 110 and the bar wrench 120 be stainless steel, or alloy steel, or carbon steel can have good strength and stiffness, ensuring that the arc-shaped steel ring 110 and the bar wrench 120 will not break or be damaged during the force application process.

[0057] In summary, compared with the prior art, in the embodiments of the present application, the arc-shaped actuating component 10 is held on the adjusting ring 40, and one end of the bar wrench 120 located inside the arc-shaped steel ring 110 is inserted into the blind hole on the adjusting ring 40. Multiple arc-shaped actuating components 10 are connected in a butt joint through a connecting structure to form an actuating wheel disc covering the adjusting ring 40, so that when the piston rod 30 is screwed into or out of the crosshead, it is possible to avoid frequently inserting and pulling out the wrench from the blind hole on the adjusting ring 40. The piston rod 30 can be screwed into or out of the crosshead by rotating the actuating wheel disc, and it can meet the requirement that multiple people can rotate the actuating wheel disc simultaneously, saving time and effort and improving work efficiency.

[0058] Second, as Figure 3 shown, the embodiments of the present application provide a method for connecting a compressor crosshead and a piston rod 30, which is applied to the compressor crosshead and piston rod 30 connecting tool described in any one of the first aspects, and includes:

[0059] S101: Hold the arc actuating assembly 10 on the adjusting ring 40, and insert one end of the bar wrench 120 located inside the arc steel ring 110 into the blind hole on the adjusting ring 40.

[0060] It should be noted that the arc actuating assembly 10 includes an arc steel ring 110 and at least one bar wrench 120. The arc steel ring 110 is provided with wrench mounting holes, and connecting structures are provided at both ends of the arc steel ring 110. The bar wrench 120 is inserted through the wrench mounting hole. One end of the bar wrench 120 is located inside the arc steel ring 110, and the other end of the bar wrench 120 is located outside the arc steel ring 110.

[0061] In some embodiments, before holding the arc actuating assembly 10 on the adjusting ring 40 and inserting one end of the bar wrench 120 located inside the arc steel ring 110 into the blind hole on the adjusting ring 40, it further includes:

[0062] Remove the lock nut 50 provided on the outside of the adjusting ring 40.

[0063] It should be noted that as Figure 2 shown, a lock nut 50 is provided on the outside of the adjusting ring 40. When the piston rod 30 is screwed into or out of the crosshead, the lock nut 50 needs to be removed first.

[0064] S102: Connect multiple arc actuating assemblies 10 in butt joint through the connecting structure to form a actuating wheel disc covering the adjusting ring 40.

[0065] S103: Actuate the actuating wheel disc to screw the piston rod 30 into or out of the crosshead.

[0066] It should be noted that after connecting multiple arc actuating assemblies 10 in butt joint through the connecting structure to form an actuating wheel disc covering the adjusting ring 40, the bar wrench 120 on the actuating wheel disc can be actuated to screw the piston rod 30 into or out of the crosshead. And since there are multiple bar wrenches 120 on the actuating wheel disc, multiple people can simultaneously rotate the actuating wheel disc, improving the installation or disassembly efficiency, saving time and effort. Among them, the bar wrenches 120 on the actuating wheel disc are evenly distributed in a circle.

[0067] It should be noted that the connecting structure includes a connecting plate 1101 and a connecting bolt 1102. The connecting plate 1101 is provided at the end of the arc steel ring 110 and extends radially outward along the arc steel ring 110. The connecting plate 1101 is provided with connecting holes, and multiple arc actuating assemblies 10 are connected through the connecting plate 1101 and the connecting bolt 1102.

[0068] It should be noted that by arranging the connecting plate 1101 on the outer side of the arc-shaped steel ring 110, it is convenient to connect when multiple arc-shaped actuating components 10 are butted. The connection between multiple arc-shaped actuating components 10 can also be connected by other detachable methods such as buckles. The embodiments of the present application do not limit this.

[0069] In some embodiments, after turning the actuating wheel disc to screw the piston rod 30 into or out of the crosshead, it further includes:

[0070] Installing the lock nut 50 provided on the outer side of the adjusting ring 40.

[0071] It should be noted that after the overhaul is completed and the piston rod 30 is screwed into the crosshead, the lock nut 50 provided on the outer side of the adjusting ring 40 can be installed to complete the entire work.

[0072] In summary, in the embodiments of the present application, the arc-shaped actuating component 10 is held on the adjusting ring 40, and one end of the bar wrench 120 located inside the arc-shaped steel ring 110 is inserted into the blind hole on the adjusting ring 40; multiple arc-shaped actuating components 10 are butted and connected through a connection structure to form an actuating wheel disc covering the adjusting ring 40; turning the actuating wheel disc to screw the piston rod 30 into or out of the crosshead can solve the problems of time-consuming, laborious and low efficiency existing in the connection between the existing crosshead and the piston rod 30. By rotating the actuating wheel disc, the piston rod 30 can be screwed into or out of the crosshead, and it can meet the requirement that multiple people can turn the actuating wheel disc simultaneously, which saves time and effort and improves work efficiency.

[0073] It should be understood that in the description of the present invention, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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 thus cannot be understood as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "multiple" is two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features between them.

[0074] In the description of the present invention, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature.

[0075] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0076] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0077] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A connecting tool for a compressor crosshead and a piston rod, characterized in that, Comprising a plurality of arc-shaped actuating components (10), the arc-shaped actuating components (10) comprising: An arc-shaped steel ring (110) provided with wrench mounting holes thereon and connection structures at both ends thereof; At least one bar wrench (120) inserted into the wrench mounting hole, with one end located inside the arc-shaped steel ring (110) and the other end located outside the arc-shaped steel ring (110); During the actuating condition, the arc-shaped actuating component (10) is held on the adjusting ring (40), and the end of the bar wrench (120) located inside the arc-shaped steel ring (110) is inserted into the blind hole on the adjusting ring (40), and a plurality of the arc-shaped actuating components (10) are butt-connected through the connection structure to form an actuating wheel disc covering the adjusting ring (40).

2. The connecting tool for the compressor crosshead and the piston rod according to claim 1, characterized in that The plurality of arc-shaped actuating components (10) are two arc-shaped actuating components (10), and the radian of the arc-shaped steel ring (110) of the arc-shaped actuating component (10) is 90 degrees.

3. The connecting tool for the compressor crosshead and the piston rod according to claim 1, wherein The at least one bar wrench (120) is two bar wrenches (120), the included angle between the two bar wrenches (120) is 90 degrees, and the included angle between the bar wrench (120) and the end face of the arc-shaped steel ring (110) is 45 degrees.

4. The connecting tool for the compressor crosshead and the piston rod according to claim 1, characterized in that, The connection structure includes a connecting plate (1101) and a connecting bolt (1102), the connecting plate (1101) is provided at the end of the arc-shaped steel ring (110) and extends radially outward along the arc-shaped steel ring (110), the connecting plate (1101) is provided with connection holes, and a plurality of the arc-shaped actuating components (10) are connected through the connecting plate (1101) and the connecting bolt (1102).

5. The connecting tool for the compressor crosshead and the piston rod according to claim 1, characterized in that The arc-shaped steel ring (110) is a hollow structure.

6. The connecting tool for the compressor crosshead and the piston rod according to claim 1, wherein, The arc-shaped actuating component (10) further includes an auxiliary wrench (20), and the auxiliary wrench (20) is provided outside the arc-shaped steel ring (110).

7. The connecting tool for the compressor crosshead and the piston rod according to any one of claims 1-6, characterized in that The materials of the arc-shaped steel ring (110) and the bar wrench (120) are stainless steel, or alloy steel, or carbon steel.

8. A connecting method for a compressor crosshead and a piston rod, applied to the connecting tool for the compressor crosshead and the piston rod as described in any one of claims 1-7, characterized in that, Comprising: Holding the arc-shaped actuating component (10) on the adjusting ring (40), and inserting the end of the bar wrench (120) located inside the arc-shaped steel ring (110) into the blind hole on the adjusting ring (40); Butt-connecting a plurality of the arc-shaped actuating components (10) through the connection structure to form an actuating wheel disc covering the adjusting ring (40); Actuating the actuating wheel disc to screw the piston rod (30) into or out of the crosshead.

9. The method for connecting the compressor crosshead and the piston rod according to claim 8, characterized in that, Before holding the arc-shaped actuating component (10) on the adjusting ring (40) and inserting the end of the bar wrench (120) located inside the arc-shaped steel ring (110) into the blind hole on the adjusting ring (40), further comprising: Removing the locking nut (50) provided outside the adjusting ring (40).

10. The method for connecting the compressor crosshead and the piston rod according to claim 8, characterized in that, After actuating the actuating wheel disc to screw the piston rod (30) into or out of the crosshead, further comprising: Installing the locking nut (50) provided outside the adjusting ring (40).

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