Crosshead turnover device

Abstract

The invention relates to the technical field of compressors, in particular to a crosshead turnover device which comprises a center penetrating lever arranged on a crosshead in a penetrating mode. The piston side fixing assembly is arranged on the center penetrating lever in a sleeving mode and connected with the piston connecting end of the crosshead; the connecting rod side fixing assembly is arranged on the center penetrating bar in a sleeving manner and abuts against the inner side of the connecting rod connecting end of the crosshead; the two jacking assemblies are arranged on the outer side of the piston side fixing assembly and the outer side of the connecting rod side fixing assembly respectively, the bottoms of the two jacking assemblies abut against the sliding way where the crosshead is installed, and the upper ends of the two jacking assemblies are rotationally connected with the piston side fixing assembly and the connecting rod side fixing assembly respectively; in the turnover working condition, the jacking assembly jacks up the center penetrating rod and the crosshead arranged on the center penetrating rod so as to turn over the crosshead, and the problems that when an existing crosshead is replaced, the position of the crosshead in a sliding way is difficult to adjust, time and labor are wasted when the crosshead is turned over manually, the turnover difficulty is large, and a sliding shoe of the crosshead is prone to being damaged can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular, to a crosshead flipping device. Background Art

[0002] 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. A crosshead is a part connecting the piston and the 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. When overhauling, it is often necessary to replace the crosshead. The existing method for replacing the crosshead is to horizontally send the crosshead into the crosshead slideway from the inspection opening of the crankcase, and then use a sling and a crowbar to cooperate to flip it by 180°. There are problems such as difficulty in adjusting the position of the crosshead in the slideway, time-consuming and laborious manual operation of crosshead flipping, large flipping difficulty, and easy damage to the slippers of the crosshead. Summary of the Invention

[0004] An embodiment of the present invention provides a crosshead flipping device, which can solve the problems of difficulty in adjusting the position of the crosshead in the slideway, time-consuming and laborious manual operation of crosshead flipping, large flipping difficulty, and easy damage to the slippers of the crosshead existing in the existing crosshead replacement.

[0005] An embodiment of the present application provides a crosshead flipping device, including:

[0006] A central through-bar, which is inserted through the crosshead;

[0007] A piston-side fixing component, which is sleeved on the central through-bar and is connected to the piston connection end of the crosshead;

[0008] A connecting-rod-side fixing component, which is sleeved on the central through-bar and abuts against the inner side of the connecting-rod connection end of the crosshead;

[0009] At least two jacking components, which are respectively arranged outside the piston-side fixing component and the connecting-rod-side fixing component. The bottoms of the two jacking components abut against the slideway for installing the crosshead, and the upper ends of the two jacking components are respectively rotatably connected to the piston-side fixing component and the connecting-rod-side fixing component;

[0010] In the flipping working condition, the jacking component jacks up the central through-bar and the crosshead arranged on the central through-bar to flip the crosshead.

[0011] In some embodiments, the piston-side fixing component includes:

[0012] A piston-side bearing sleeve, which is sleeved on the central through-bar;

[0013] A piston-side mounting disc, which has a connecting external thread on its outer side and a piston-side mounting hole at its center;

[0014] In the overturning condition, the piston-side mounting disc is sleeved on the piston-side bearing sleeve and is connected to the internal thread of the connecting end of the crosshead piston through the connecting external thread.

[0015] In some embodiments, the connecting-rod-side fixing assembly includes:

[0016] A connecting-rod-side bearing sleeve, which is sleeved on the central through-bar;

[0017] A connecting-rod-side mounting disc, which relatively has two abutting arcs on its outer side and a connecting-rod-side mounting hole at its center. Among them, the radian of the abutting arc is adapted to the inner side of the connecting end of the crosshead connecting rod;

[0018] In the overturning condition, the connecting-rod-side mounting disc is sleeved on the connecting-rod-side bearing sleeve and abuts against the inner side of the connecting end of the crosshead connecting rod through the abutting arc.

[0019] In some embodiments, at least one weight-reducing hole is provided on the connecting-rod-side mounting disc.

[0020] In some embodiments, the jacking assembly includes:

[0021] A supporting structure, which is rotatably connected to the piston-side fixing assembly and / or the connecting-rod-side fixing assembly;

[0022] A jacking structure, whose bottom abuts against the slideway and whose top is connected to the supporting structure. The jacking structure is used to jack up or lower the supporting structure.

[0023] In some embodiments, the supporting structure includes:

[0024] A bearing support seat, which is arranged on the jacking structure and includes a fixed base and a movable arc-shaped base embedded in the fixed base. A jackscrew is provided on each of the two sides in the length direction of the fixed base, and the jackscrew abuts against the movable arc-shaped base. The jackscrew is used to adjust the position of the movable arc-shaped base;

[0025] A supporting bearing, which is arranged on the movable arc-shaped base.

[0026] In some embodiments, the jacking structure includes:

[0027] A jack, whose upper end is connected to the supporting structure;

[0028] A jacking support seat, whose upper end is connected to the jack and whose lower end has a supporting arc, and the supporting arc is adapted to the inner side of the slideway.

[0029] In some embodiments, a wear-resistant layer is provided on the support arc, and the wear-resistant layer is polytetrafluoroethylene.

[0030] In some embodiments, the jack is an automotive jack, and the automotive jack includes a jack body and a crank for adjusting the jack body.

[0031] In some embodiments, external threads are provided at both ends of the central through-bar, and the crosshead flipping device further includes two fastening nuts, and the two fastening nuts are threadedly connected to both ends of the central through-bar.

[0032] Compared with the prior art, in the embodiment of the present application, by passing the central through-bar through the crosshead, connecting the piston-side fixing component to the piston connection end of the crosshead and connecting the connecting-rod-side fixing component to the connecting-rod connection end of the crosshead, the crosshead can be fixed. By rotatably connecting the upper ends of the two jacking components to the piston-side fixing component and the connecting-rod-side fixing component respectively, and abutting the bottoms of the two jacking components against the slideway on which the crosshead is installed, when in the flipping working condition, the central through-bar and the crosshead provided on the central through-bar can be jacked up by the jacking components to flip the crosshead, which can solve the problems existing in the replacement of the existing crosshead, such as it is difficult to adjust the position of the crosshead in the slideway, it is time-consuming and laborious to manually operate the flipping of the crosshead, the flipping difficulty is large, and the sliding shoes of the crosshead are easily damaged. It can conveniently adjust the height of the crosshead, flip the crosshead in a time-saving and labor-saving manner, and is not easy to damage the sliding shoes of the crosshead. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the drawings.

[0034] Figure 1 It is a schematic structural diagram of a crosshead flipping device provided by an embodiment of the present invention.

[0035] Reference numerals:

[0036] 10, crosshead;

[0037] 20, piston-side fixing component; 210, piston-side bearing sleeve; 220, piston-side mounting plate; 2201, piston-side mounting hole;

[0038] 30, connecting-rod-side fixing component; 310, connecting-rod-side mounting plate; 3101, abutting arc; 3102, connecting-rod-side mounting hole; 3103, weight-reducing hole; 320, connecting-rod-side bearing sleeve;

[0039] 40, jacking component; 410, support structure; 4101, support bearing; 4102, bearing support seat; 420, jacking structure; 4201, jack; 4202, jacking support seat;

[0040] 50. Central through-bar Specific embodiments

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] A reciprocating compressor refers to a compressor that realizes the pressurization and transportation of gas through the reciprocating motion of a piston or diaphragm in a cylinder, causing the volume of the cylinder to change periodically. It belongs to the positive displacement compressor type. According to the components that make reciprocating motion, it is divided into piston-type and diaphragm-type compressors. A crosshead is a part that connects the piston and the connecting rod in a reciprocating compressor and has a guiding function.

[0043] A reciprocating compressor mainly consists of components such as a cylinder, a piston, a connecting rod, a crosshead, and a crankshaft. Its working principle is that under the drive of the crankshaft, the connecting rod and the piston move reciprocally together, continuously compressing the gas in the cylinder to achieve the purpose of increasing the gas pressure. During the use of a large reciprocating compressor, the components of the compressor may malfunction and need to be repaired or replaced. Among them, the crosshead, as one of the key components of the compressor, is prone to failure and requires regular inspection and maintenance. Currently, the conventional method for replacing the crosshead is to first remove all the connecting rods and then lift out the crankshaft. After making space in the crankcase, the crosshead is then fed horizontally into the slideway. The process is relatively stable but involves a large amount of work. It is also possible to horizontally feed the crosshead into the crosshead slideway through the maintenance opening of the crankcase and then use a sling and a crowbar in cooperation to turn it by 180°. Although the amount of work is relatively reduced, the turning work is difficult and it is extremely easy to damage the slipper of the crosshead. Taking the 4M80 type reciprocating machine as an example, the weight of the crosshead component is about 485 Kg, the diameter is about 540 mm, and it is vertically installed in the internal slideway with a circumferential clearance of only 0.5 mm. The space is narrow and the crosshead body is very heavy. Moreover, since it is difficult to adjust the crosshead to be aligned with the center line of the slideway in the slideway, the turning is very likely to fail. During the adjustment and turning process, it consumes a great deal of physical strength of the maintenance personnel and is prone to knocking and damaging the slipper of the crosshead, resulting in rework.

[0044] In response to the above technical problems, as Figure 1 shown, this embodiment provides a crosshead turning device, including:

[0045] A central through-bar 50, which is inserted through the crosshead 10;

[0046] A piston-side fixing component 20, which is sleeved on the central through-bar 50 and is connected to the piston connection end of the crosshead 10;

[0047] A connecting-rod-side fixing component 30, which is sleeved on the central through-bar 50 and abuts against the inner side of the connecting-rod connection end of the crosshead 10;

[0048] At least two jacking components 40 are respectively arranged outside the piston-side fixing component 20 and the connecting rod-side fixing component 30. The bottoms of the two jacking components 40 are abutted against the slideway for installing the crosshead 10, and the upper ends of the two jacking components 40 are respectively rotatably connected to the piston-side fixing component 20 and the connecting rod-side fixing component 30;

[0049] In the flipping working condition, the jacking component 40 jacks up the central through-bar 50 and the crosshead 10 arranged on the central through-bar 50 to flip the crosshead 10.

[0050] It should be noted that the piston connection end of the crosshead 10 is used to be connected to the piston in the compressor, and the connecting rod connection end of the crosshead 10 is used to be connected to the connecting rod in the compressor. After the crosshead 10 is sent into the slideway, the central through-bar 50 can be passed through the crosshead 10, and then the piston-side fixing component 20 is connected to the piston connection end of the crosshead 10 ( Figure 1 the right end of the crosshead 10 in Figure 1 ), and the connecting rod-side fixing component 30 is connected to the connecting rod connection end of the crosshead 10 (

[0051] the left end of the crosshead 10 in

[0052] ). Then, the crosshead 10 can be jacked up at both ends of the crosshead 10 through the jacking component 40, so that there is a certain gap between the crosshead 10 and the slideway to flip the crosshead 10. In this way, the problems of time-consuming, laborious and easy damage to the slide shoes of the crosshead 10 existing in manually flipping the crosshead 10 can be reduced.

[0053] In some embodiments, the piston-side fixing component 20 includes:

[0054] A piston-side bearing sleeve 210 sleeved on the central through-bar 50;

[0055] A piston-side mounting disc 220 having a connecting external thread on its outer side and a piston-side mounting hole 2201 at its center;

[0056] In the flipping working condition, the piston-side mounting disc 220 is sleeved on the piston-side bearing sleeve 210 and connected to the internal thread of the piston connection end of the crosshead 10 through the connecting external thread.

[0055] It should be noted that the piston-side bearing sleeve 210 is passed through the piston-side mounting hole 2201 and sleeved on the central through-bar 50. The piston-side bearing sleeve 210, the piston-side mounting disc 220 and the central through-bar 50 are coaxially arranged. Among them, a part of the piston-side bearing sleeve 210 is located inside the piston-side mounting hole 2201, and a part is located outside the piston-side mounting hole 2201. The part of the piston-side bearing sleeve 210 located outside the piston-side mounting hole 2201 is used to be connected to the jacking component 40. A plurality of weight-reducing holes can be provided on the piston-side mounting disc 220, and the plurality of weight-reducing holes can be evenly distributed along the center of the piston-side mounting disc 220.

[0056] In some embodiments, the connecting rod side fixing assembly 30 includes:

[0057] A connecting rod side bearing sleeve 320 sleeved on the central through-bar 50;

[0058] A connecting rod side mounting disc 310, on the outer side of which there are two opposing arcs 3101 provided oppositely, and at the center thereof there is a connecting rod side mounting hole 3102. Among them, the radian of the opposing arc 3101 is adapted to the inner side of the connecting end of the crosshead 10 and the connecting rod;

[0059] In the flipping working condition, the connecting rod side mounting disc 310 is sleeved on the connecting rod side bearing sleeve 320 and abuts against the inner side of the connecting end of the crosshead 10 through the opposing arc 3101.

[0060] In some embodiments, at least one weight-reducing hole 3103 is provided on the connecting rod side mounting disc 310.

[0061] It should be noted that the connecting rod side bearing sleeve 320 is passed through the connecting rod side mounting hole 3102 and sleeved on the central through-bar 50. The connecting rod side bearing sleeve 320, the connecting rod side mounting disc 310 and the central through-bar 50 are coaxially arranged. Among them, a part of the connecting rod side bearing sleeve 320 is located inside the connecting rod side mounting hole 3102, and a part is located outside the connecting rod side mounting hole 3102. The part of the connecting rod side bearing sleeve 320 located outside the connecting rod side mounting hole 3102 is used to be connected to the jacking assembly 40. A plurality of weight-reducing holes 3103 can be provided on the connecting rod side mounting disc 310, and the plurality of weight-reducing holes 3103 can be arranged at intervals along the length direction and the width direction of the connecting rod side mounting disc 310.

[0062] It should be noted that the connecting end of the crosshead 10 has a groove. When connecting the connecting rod side mounting disc 310 with the connecting end of the crosshead 10, the side surface of the connecting rod side mounting disc 310 abuts against the groove, and the opposing arc 3101 of the connecting rod side mounting disc 310 abuts against the inner wall of the connecting end, thereby fixing the crosshead 10.

[0063] In some embodiments, the jacking assembly 40 includes:

[0064] A support structure 410 rotatably connected to the piston side fixing assembly 20 and / or the connecting rod side fixing assembly 30;

[0065] A jacking structure 420, the bottom of which abuts against the slideway, and the top of which is connected to the support structure 410. The jacking structure 420 is used to jack up or lower the support structure 410.

[0066] It should be noted that one support structure 410 is rotatably connected to the part of the piston-side bearing sleeve 210 outside the piston-side mounting hole 2201, and the other support structure 410 is rotatably connected to the part of the connecting-rod-side bearing sleeve 320 outside the connecting-rod-side mounting hole 3102. After the crosshead 10 is lifted by the lifting structure 420, the central through rod passing through the crosshead 10 can freely rotate under the drive of an external force to realize the flipping of the crosshead 10.

[0067] In some embodiments, the support structure 410 includes:

[0068] A bearing support seat 4102, which is arranged on the lifting structure 420 and includes a fixed base and a movable arc-shaped base embedded in the fixed base. One jackscrew is provided on each side of the fixed base in the length direction, and the jackscrew abuts against the movable arc-shaped base. The jackscrew is used to adjust the position of the movable arc-shaped base;

[0069] A support bearing 4101, which is arranged on the movable arc-shaped base.

[0070] It should be noted that the fixed base is a trough-shaped structure with an open upper end. The movable arc-shaped base is embedded in the notch of the fixed base and abuts against the jackscrew. When flipping, the horizontal position of the crosshead 10 can be adjusted by adjusting the jackscrew to ensure that the crosshead 10 is coaxial with the slideway. If the crosshead 10 and the slideway are not concentric, the crosshead 10 and the slideway may collide during flipping, causing damage to the crosshead 10 or the slideway. Among them, the support bearing 4101 can be a 6023 bearing, and the support bearing 4101 bears the weight of the crosshead 10.

[0071] In some embodiments, the lifting structure 420 includes:

[0072] A jack 4201, the upper end of which is connected to the support structure 410;

[0073] A lifting support seat 4202, the upper end of which is connected to the jack 4201, and the lower end has a support arc, and the support arc is adapted to the inner side of the slideway.

[0074] It should be noted that the lower end of the jack 4201 is arranged at the central position of the upper end of the lifting support seat 4202 to maintain balance when lifting the crosshead 10. The support arc of the lifting support seat 4202 has a larger stress-bearing area than the jack 4201 and has better contact with the inner wall of the slideway, which can reduce the stress on the slideway when lifting and lowering the crosshead 10 and avoid damaging the slideway.

[0075] In some embodiments, a wear-resistant layer is provided on the support arc, and the wear-resistant layer is polytetrafluoroethylene.

[0076] It should be noted that by setting the wear-resistant layer, the slideway can be better protected. Generally, the thickness of the wear-resistant layer can be 1-2 mm, and it can also be set according to actual needs.

[0077] In some embodiments, the jack 4201 is an automotive jack, and the automotive jack includes a jack body and a crank for adjusting the jack body.

[0078] It should be noted that the automotive jack can lift or lower the crosshead 10 by rotating the crank, rather than the conventional jack 4201 that is lifted and lowered by pressing. If the jack 4201 that is lifted and lowered by pressing is used, it will cause additional pressure on the lifting support seat 4202 when pressing the jack 4201, causing the lifting support seat 4202 to rotate and shift, resulting in inaccurate adjustment and positioning of the crosshead 10.

[0079] In some embodiments, external threads are provided at both ends of the central through-bar 50, and the crosshead flipping device further includes two fastening nuts that are threadedly connected to both ends of the central through-bar 50.

[0080] It should be noted that when using the crosshead flipping device provided in the embodiment of the present application, after the crosshead 10 is sent into the slideway, the central through-bar 50 is passed through the crosshead 10, and then a piston-side bearing sleeve 210 is sleeved on the central through-bar 50 at the piston connection end of the crosshead 10. Then, the piston-side mounting plate 220 is sleeved on the piston-side bearing sleeve 210, and the outer side of the piston-side mounting plate 220 is connected to the internal thread at the piston connection end of the crosshead 10. A connecting-rod-side bearing sleeve 320 is sleeved on the central through-bar 50 at the connecting-rod connection end of the crosshead 10. Then, the connecting-rod-side mounting plate 310 is sleeved on the connecting-rod-side bearing sleeve 320, and the abutting arc 3101 of the connecting-rod-side mounting plate 310 abuts against the inner side of the connecting-rod connection end of the crosshead 10. Then, the two lifting assemblies 40 are respectively sleeved on the piston-side bearing sleeve 210 and the connecting-rod-side bearing sleeve 320, that is, the support bearing 4101 of the support structure 410 of one lifting assembly 40 is sleeved on the piston-side bearing sleeve 210, and the lifting structure 420 of the lifting assembly 40, that is, the lifting support seat 4202, abuts against the inner wall of the slideway. The support bearing 4101 of the support structure 410 of the other lifting assembly 40 is sleeved on the connecting-rod-side bearing sleeve 320, and the lifting structure 420 of the lifting assembly 40, that is, the lifting support seat 4202, abuts against the inner wall of the slideway. Then, two fastening nuts are installed at both ends of the central through-bar 50 for fixation, thus completing the installation of the crosshead flipping device.

[0081] It should be noted that when turning over, first use the jack 4201 of the jacking structure 420 to lift the crosshead 10 to the same height as the axis of the slideway, and then adjust the horizontal position of the movable arc base by adjusting the jackscrew on the fixed base, that is, adjust the horizontal position of the crosshead 10. In this way, the adjustment of the height and horizontal position of the crosshead 10 can be realized. After adjusting the crosshead 10 to be coaxial with the slideway, the crosshead 10 can be turned over. At this time, there is a gap between the crosshead 10 and the slideway, and the crosshead 10 and the slideway will not collide during rotation, ensuring the safety and reliability of the turnover.

[0082] In summary, compared with the prior art, in the embodiment of the present application, by passing the central through-bar 50 through the crosshead 10, connecting the piston-side fixing component 20 to the piston connection end of the crosshead 10, and connecting the connecting-rod side fixing component 30 to the connecting-rod connection end of the crosshead 10, the crosshead 10 can be fixed. By rotatably connecting the upper ends of the two jacking components 40 to the piston-side fixing component 20 and the connecting-rod side fixing component 30 respectively, and abutting the bottoms of the two jacking components 40 against the slideway on which the crosshead 10 is installed, when in the turnover working condition, the central through-bar 50 and the crosshead 10 provided on the central through-bar 50 can be lifted by the jacking component 40 to turn over the crosshead 10, which can solve the problems existing in the replacement of the existing crosshead 10, such as it is difficult to adjust the position of the crosshead 10 in the slideway, it is time-consuming and laborious to manually operate the turnover of the crosshead 10, the turnover difficulty is large, and the sliding shoes of the crosshead 10 are easily damaged. It can conveniently adjust the height of the crosshead 10, turn over the crosshead 10 in a time-saving and labor-saving manner, and is not easy to damage the sliding shoes of the crosshead 10.

[0083] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by 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. is 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 therefore 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 "a plurality" is two or more. In the description of the present invention, that the first feature is "above" or "below" the second feature may include direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through other features therebetween.

[0084] In the description of the present invention, the first feature being "above", "over" or "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.

[0085] In the description of the present invention, it should be noted that, unless otherwise clearly defined 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 components. 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 circumstances.

[0086] 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 representations 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.

[0087] 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 crosshead flipping device, characterized in that, Comprising: A central through-bar (50) is inserted through the crosshead (10); A piston-side fixing assembly (20) is sleeved on the central through-bar (50) and is connected to the piston connection end of the crosshead (10); A connecting-rod-side fixing assembly (30) is sleeved on the central through-bar (50) and abuts against the inner side of the connecting-rod connection end of the crosshead (10); At least two jacking assemblies (40), the two jacking assemblies (40) are respectively arranged outside the piston-side fixing assembly (20) and the connecting-rod-side fixing assembly (30), the bottoms of the two jacking assemblies (40) abut against the slideway for installing the crosshead (10), and the upper ends of the two jacking assemblies (40) are respectively rotatably connected to the piston-side fixing assembly (20) and the connecting-rod-side fixing assembly (30); In the flipping working condition, the jacking assembly (40) jacks up the central through-bar (50) and the crosshead (10) arranged on the central through-bar (50) to flip the crosshead (10).

2. The crosshead flipping device according to claim 1, wherein, The piston-side fixing assembly (20) includes: A piston-side bearing sleeve (210) is sleeved on the central through-bar (50); A piston-side mounting disc (220), which has a connecting external thread on its outer side and a piston-side mounting hole (2201) at its center; In the flipping working condition, the piston-side mounting disc (220) is sleeved on the piston-side bearing sleeve (210) and is connected to the internal thread of the piston connection end of the crosshead (10) through the connecting external thread.

3. The crosshead flipping device according to claim 1, characterized in that, The connecting-rod-side fixing assembly (30) includes: A connecting-rod-side bearing sleeve (320) is sleeved on the central through-bar (50); A connecting-rod-side mounting disc (310), on which two abutting arcs (3101) are relatively arranged on its outer side, and a connecting-rod-side mounting hole (3102) is arranged at its center, wherein the radian of the abutting arc (3101) is adapted to the inner side of the connecting-rod connection end of the crosshead (10); In the flipping working condition, the connecting-rod-side mounting disc (310) is sleeved on the connecting-rod-side bearing sleeve (320) and abuts against the inner side of the connecting-rod connection end of the crosshead (10) through the abutting arc (3101).

4. The crosshead flipping device according to claim 3, characterized in that, At least one weight-reducing hole (3103) is arranged on the connecting-rod-side mounting disc (310).

5. The crosshead flipping device according to claim 1, characterized in that, The jacking assembly (40) includes: A support structure (410) is rotatably connected to the piston-side fixing assembly (20) and / or the connecting-rod-side fixing assembly (30); A jacking structure (420), its bottom abuts against the slideway, and its top is connected to the support structure (410), and the jacking structure (420) is used to jack up or lower the support structure (410).

6. The crosshead flipping device according to claim 5, characterized in that, The support structure (410) includes: A bearing support seat (4102) is arranged on the jacking structure (420), including a fixed base and a movable arc-shaped base embedded in the fixed base. A jackscrew is arranged on each of the two sides in the length direction of the fixed base, and the jackscrew abuts against the movable arc-shaped base, and the jackscrew is used to adjust the position of the movable arc-shaped base; A support bearing (4101) is arranged on the movable arc-shaped base.

7. The crosshead flipping device according to claim 5, characterized in that, The jacking structure (420) includes: A jack (4201) whose upper end is connected to the support structure (410); A jacking support base (4202) whose upper end is connected to the jack (4201) and whose lower end has a support arc that is adapted to the inner side of the slideway.

8. The crosshead flipping device according to claim 7, characterized in that, A wear-resistant layer is provided on the support arc, and the wear-resistant layer is polytetrafluoroethylene.

9. The crosshead flipping device according to claim 7, characterized in that, The jack (4201) is an automotive jack, and the automotive jack includes a jack body and a crank for adjusting the jack body.

10. The crosshead flipping device according to any one of claims 1-9, characterized in that, External threads are provided at both ends of the central through-bar (50), and the crosshead flipping device further includes two fastening nuts that are threadedly connected to both ends of the central through-bar (50).

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