Centering and aligning method for frame crosshead of ultrahigh pressure compressor

Abstract

The invention discloses a centering and aligning method for a frame crosshead of an ultrahigh-pressure compressor. The centering and aligning method comprises the steps that S1, a sliding shoe of the frame crosshead is attached to a guide rail on one side of a sliding way; s2, an auxiliary distance measuring flat plate I and an auxiliary distance measuring flat plate II are mounted on the two side edges, corresponding to a frame crosshead, of the crankcase and the positions, where elastic rod couplings are mounted, of the frame crosshead correspondingly; s3, the middle body and the cross head pin are installed on the sliding shoe; s4, measuring the horizontal distance between the two cylindrical ends of the crosshead pin and the first auxiliary distance measuring flat plate on one side of the crosshead pin, and calculating the difference value of the two measured values; measuring the horizontal distance between the two ends of the auxiliary distance measuring flat plate II and the auxiliary distance measuring flat plate I on one side, and calculating the difference value of the two measured values; and if the two difference values are within the allowable tolerance range, the frame crosshead of the ultrahigh pressure compressor is centered and aligned. According to the method, centering and alignment of the crosshead of the frame can be completed in a high-quality mode, and the frequency of non-planned parking caused by the problems of leakage of high-pressure filler, too high vibration of an elastic rod and the like can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-high pressure compressors, and in particular to a method for centering and aligning a frame crosshead of an ultra-high pressure compressor. Background Art

[0002] An EHV compressor is a compressor with an exhaust pressure greater than 100MPa. It is mainly used in the production of high-pressure polyethylene and is often used as a booster compressor. Since the polymerization reaction rate is only 10%-30%, the gas volume processed by the EHV compressor is about 3-4 times greater than the working pressure of the high-pressure compressor. When the EHV compressor is running, the pressure can reach more than 240Mpa (2400 kg). The huge pressure also requires that the maintenance data must be accurate and precise. If the cylinder vibration intensifies, the packing wears and leaks after the EHV compressor has been running for a period of time, the packing can be replaced. The life of the packing is generally 6-10 months. If the packing frequently wears and leaks, it means that the slipper of the EHV compressor is worn and causes the slipper to deflect, that is, there is a problem with the centering of the slipper, and the EHV compressor needs to be repaired.

[0003] During the overhaul process, the control standards for key data of the ultra-high pressure compressor are very strict. During the overhaul, the most difficult part is how to make the plunger run stably within the optimal range, and the alignment of the crosshead of the ultra-high pressure compressor frame has become a key node for the smooth progress of the overhaul work. This is because during the operation of the unit, the sliding shoe will produce a certain amount of wear, causing the sliding shoe to deflect. If the sliding shoe deflects, it will be reflected on the plunger, that is, the plunger is deflected, and it will wear against the packing. The plunger is made of tungsten carbide (tungsten carbide can withstand a pressure of 240Mpa for a long time). This material is hard, and long-term wear will cause the packing to leak; at the same time, it will also cause the cylinder of the ultra-high pressure compressor to heat up, vibrate too much, etc., seriously affecting the service life of the elastic rod and the high-pressure packing. At present, the alignment of the sliding shoe position is generally adjusted by adding or subtracting shims on the side of the sliding shoe, but this adjustment method is not accurate enough, which will delay the construction period and affect production.

[0004] Based on the above problems, we can start with the frame crosshead installed on the sliding shoe. By aligning the position of the deflected frame crosshead, the plunger connected to it can be aligned, thereby reducing the occurrence of the above problems. Therefore, it is imperative to find a systematic method for aligning the crosshead of the ultra-high pressure compressor frame. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a method for centering and aligning the frame crosshead of an ultra-high pressure compressor, which can complete the centering and alignment of the frame crosshead with high quality, enable the plunger to operate stably within an optimal range, reduce the frequency of unplanned shutdowns caused by problems such as leakage of high-pressure packing and excessive vibration of the elastic rod, assist the ultra-high pressure compressor in long-term stable operation, and enable the ultra-high pressure compressor to reach a state of efficient production.

[0006] The technical solution of the present invention is:

[0007] The method for centering and aligning the frame crosshead of an ultra-high pressure compressor includes the following steps:

[0008] S1 Place the sliding shoe of the frame crosshead into the crankcase slideway and fit it into the guide rail on one side of the slideway;

[0009] S2 Install auxiliary distance measuring plate 1 at the position of the crankcase corresponding to the two sides of the frame crosshead, and install auxiliary distance measuring plate 2 at the position where the elastic rod coupling is installed on the frame crosshead;

[0010] S3 installs the intermediate body and crosshead pin of the frame crosshead on the sliding shoe accordingly;

[0011] S4 finds two horizontally symmetrical measuring points on the auxiliary ranging plate 1, and the horizontal distance between the two measuring points is equal to the length of the line connecting the center points of the two keyholes on the cross pin; then measures the horizontal distance between the two measuring points on the auxiliary ranging plate 1 and the two cylindrical ends of the cross pin, and calculates the difference between the two measured values; the length of the auxiliary ranging plate 2 is equal to the length of the line connecting the center points of the two keyholes on the cross pin, measures the horizontal distance between the two ends of the auxiliary ranging plate 2 and the auxiliary ranging plate 1 on one side of it, and calculates the difference between the two measured values; determines whether the above two differences are within the allowable tolerance range, and if they are within the allowable tolerance range, it means that the frame crosshead of the ultra-high pressure compressor is aligned and corrected.

[0012] Because the plunger and cylinder of the F8 ultra-high pressure compressor are arranged symmetrically, the crosshead pin corresponds to the plunger and cylinder on one side, and the intermediate body corresponds to the plunger and cylinder on the other side. Therefore, it is necessary to measure the above two differences to determine whether both sides of the frame crosshead are aligned.

[0013] Preferably, in step S1, the distances between the long head side and the short head side of the sliding shoe and the fitting guide rail are measured respectively, and if the distances are less than 0.03 mm, it indicates that the sliding shoe fits the guide rail.

[0014] Preferably, in step S1, a feeler gauge is used to measure the distance between the long head side and the short head side of the sliding shoe and the fitting guide rail.

[0015] Preferably, in step S2, the auxiliary distance measuring plate 1 is mounted on the pins on both sides of the crosshead of the crankcase corresponding frame, and the auxiliary distance measuring plate 1 is provided with matching pin holes.

[0016] Preferably, in step S2, the auxiliary ranging plate 2 is provided with a bolt hole adapted to the installation position of the elastic rod coupling.

[0017] Preferably, in step S2, the auxiliary ranging plate 1 and the auxiliary ranging plate 2 are both made of stainless steel.

[0018] Preferably, in step S4, the allowable tolerance range is less than 0.03 mm.

[0019] Preferably, in step S4, the horizontal distances between two measuring points on the auxiliary ranging plate 1 and the two cylindrical ends of the cross pin, and the horizontal distances between the two ends of the auxiliary ranging plate 2 and the auxiliary ranging plate 1 on one side thereof are measured by a lever meter.

[0020] Preferably, in step S4, if it is determined that the two differences are not within the allowable tolerance range, step S5 is performed:

[0021] S51 constructs the first right triangle: draw a horizontal vertical line from a measuring point of the auxiliary distance measuring plate 1 to the cylindrical end of the cross pin 1, take the vertical line segment from the center point of the bottom of the cross pin to the horizontal vertical line as the long right angle side, draw a vertical line from the center point of the bottom of the cross pin to the outer end surface of the cylindrical end of the cross pin, take the line between the intersection of the vertical line and the horizontal vertical line and the center point of the bottom of the cross pin as the hypotenuse, connect the intersection of the long right angle side and the horizontal vertical line and the intersection of the hypotenuse and the horizontal vertical line, take the line as the short right angle side, and form the first right triangle;

[0022] S52 constructs a second right triangle: a vertical line segment from the center point of the bottom of the cross pin to the short side of the bottom surface of the cross pin with a keyhole is used as the long right side, a vertical line is drawn from the center point of the bottom of the cross pin to the auxiliary distance measuring plate 1, a line connecting the intersection of the vertical line and the short side of the bottom surface of the cross pin with a keyhole and the center point of the bottom of the cross pin is used as the hypotenuse, a line connecting the intersection of the long right side and the short side of the bottom surface of the cross pin with a keyhole and the intersection of the hypotenuse and the short side of the bottom surface of the cross pin with a keyhole is used as the short right side, and a second right triangle is formed, and the second right triangle and the first right triangle are similar triangles;

[0023] S53 constructs a third right triangle: connect the two endpoints of the keyhole on the bottom surface of the cross pin near the center point of the bottom of the cross pin, and make a perpendicular line from the center point of the bottom of the cross pin to the short side of the bottom surface of the cross pin with the keyhole, and use the line between the intersection of the two lines and the center point of the bottom of the cross pin as the long right side; use the intersection as a perpendicular line perpendicular to the right side, and use the center point of the bottom of the cross pin to the auxiliary distance measuring plate 1 as a perpendicular line, and use the intersection of the perpendicular line and the two endpoints of the keyhole near the center point of the bottom of the cross pin and the center point of the bottom of the cross pin as a connecting line, and use the connecting line as the hypotenuse, and use the line segment between the intersection of the long right side and the connecting line and the intersection of the hypotenuse and the connecting line as the short right side, so as to form a third right triangle, and the third right triangle and the first right triangle are similar triangles;

[0024] S54 Cutting the cross pin keyhole: measure the length of the short right-angled side of the first right triangle, and calculate the ratio of the length of the long right-angled side to the length of the short right-angled side according to the known length of the long right-angled side; measure the length of the long right-angled sides of the second right triangle and the third right triangle respectively, and calculate the length of the short right-angled sides of the second right triangle and the third right triangle respectively according to the theorem of similar triangles; according to the calculated lengths of the two short right-angled sides, draw two line segments parallel to the two short right-angled sides at the outer and inner endpoints of the two keyholes of the cross pin respectively, the length of the line segment at the outer endpoint is equal to the length of the short right-angled side of the second right triangle, and the length of the line segment at the inner endpoint is equal to the length of the short right-angled side of the third right triangle; connect the endpoints of the two line segments, and the straight line segment obtained is the new side of the keyhole after cutting;

[0025] S55 Alignment of the cross pin: Turn the cross pin so that the new side of the key hole is in close contact with the square key side wall of the lower sliding shoe, then tap the cross pin to deform the other side of the key hole and also in close contact with the square key side wall of the lower sliding shoe, completing the alignment of the cross pin, that is, completing the alignment of the frame cross head.

[0026] Preferably, after step S5 is completed, step S6 is performed: 1) repeating the operation of step S4; 2) measuring the distance d between the top, bottom and left and right sides of the elastic rod and the middle body slide cylinder respectively. 顶 ,d 底 ,d 左 ,d 右 , if d 顶 =0.1mm, d 左 =d 右 =0.05mm, and d 底 <0.02mm, it means that the frame crosshead of the ultra-high pressure compressor is aligned.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The centering and alignment method of the present invention is used to adjust the frame crosshead of the ultra-high pressure compressor, which can ensure the alignment accuracy and the stability of the intermediate body and the crosshead pin of the frame crosshead on the sliding shoe. This centering and alignment method can make the plunger operate stably within the optimal range, reduce the frequency of unplanned shutdowns caused by high-pressure packing leakage, excessive vibration of the elastic rod, etc., help the ultra-high pressure compressor to operate stably for a long period of time, and enable the ultra-high pressure compressor to achieve efficient production.

[0029] 2. The present invention innovatively uses the properties of similar triangles to calculate the distance that needs to be rotated when aligning the crosshead pin, thereby ensuring the installation accuracy of the frame crosshead of the ultra-high pressure compressor, further reducing the frequency of unplanned shutdowns due to problems such as leakage of high-pressure packing and excessive vibration of the elastic rod, and facilitating the long-term stable operation of the ultra-high pressure compressor, so that the ultra-high pressure compressor can reach a state of efficient production.

[0030] 3. The present invention also provides a two-step inspection and review measure to verify and ensure that the frame crosshead is aligned and correct, thereby preventing the elastic rod and high-pressure packing from having their service life shortened due to incorrect alignment data. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a schematic diagram of the positional relationship between the frame crosshead and the auxiliary ranging plate 1 and the auxiliary ranging plate 2 in the present invention.

[0033] Figure 2 It is a top view of the cross pin and the auxiliary distance measuring plate 1 in the present invention.

[0034] Figure 3 It is a top view of the auxiliary ranging plate 2 and the auxiliary ranging plate 1 in the present invention.

[0035] Figure 4 1 is a bottom view of the cross pin of the present invention, wherein the thick black line in the figure is the line connecting the center points of the two key holes.

[0036] Figure 5 It is a schematic diagram of the first right triangle, the second right triangle and the third right triangle and the new sides formed after cutting the cross pin key hole in the present invention.

[0037] Figure 6 It is a schematic diagram of the first right triangle in the present invention.

[0038] Figure 7 It is a schematic diagram of the second right triangle, the third right triangle and the new side formed after cutting the cross pin key hole in the present invention.

[0039] In the figure, 1, frame crosshead; 101, intermediate body; 102, crosshead pin; 1021, keyhole; 1022, cylindrical end; 2, sliding shoe; 301, auxiliary ranging plate 1; 302, auxiliary ranging plate 2. DETAILED DESCRIPTION

[0040] In order to enable persons skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] Example 1

[0042] This embodiment is described by taking the K103 ultra-high pressure compressor of model F8 (Burkhard Compressor AG, Switzerland) as an example.

[0043] The method for centering and aligning the frame crosshead 1 of the ultra-high pressure compressor of this embodiment comprises the following steps:

[0044] S1 takes the guide rail on one side of the crankcase slideway as the reference plane, first find the position of the frame crosshead 1 and the slide shoe 2, the specific operation is as follows:

[0045] Place the slipper 2 in the crankcase slide, then use a crowbar to push it to the guide rail on one side of the slide, and use a feeler gauge to measure the gap between the slipper 2 and the guide rail on that side. When the distance between the long head side of the slipper 2 (i.e. the side of the longer lower slide plate at the bottom of the slipper 2) and the guide rail and the distance between the short head side (i.e. the side of the shorter lower slide plate at the bottom of the slipper 2) and the guide rail are equal and less than 0.03mm, it means that the slipper 2 fits the guide rail.

[0046] Since the slipper 2 will wear during use, after the position of the slipper 2 is adjusted, it is skewed relative to the theoretical position, which means that the intermediate body 101 and the cross pin 102 connected to the slipper 2 are also skewed. Therefore, it is necessary to adjust the position of the cross pin 102 based on the cross pin 102 to align it. Aligning the position of the cross pin 102 means that the position of the intermediate body 101 is also aligned, so that the elastic rod connected to the intermediate body 101 is aligned, and finally the plunger connected to the elastic rod is aligned, thereby ensuring the stable operation of the plunger.

[0047] S2 makes and installs the auxiliary ranging plate 1 301 and the auxiliary ranging plate 2 302:

[0048] According to the pins on both sides of the crankcase corresponding to the frame crosshead 1, an auxiliary distance measuring plate 1 301 (a rectangular plate made of stainless steel) with matching pin holes is made; at the same time, according to the structure of the elastic rod coupling installed on the frame crosshead 1, an auxiliary distance measuring plate 2 302 (a rectangular plate made of stainless steel) with matching bolt holes is made. Then the two rectangular plates are respectively installed on the pins on both sides of the crankcase corresponding to the frame crosshead 1 and the position where the elastic rod coupling is installed on the frame crosshead 1 (such as Figure 1 shown).

[0049] The intermediate body 101 and the crosshead pin 102 of the S3 mounting frame crosshead 1:

[0050] Make sure that the square key, round pin and key hole 1021 and pin hole on the intermediate body 101, cross pin 102 on the sliding shoe 2 are fully matched, and then place the intermediate body 101 and cross pin 102 on the sliding shoe 2, making sure that the bottom surface of the intermediate body 101 and cross pin 102 is fully fitted with the top surface of the sliding shoe 2 (such as Figure 1 shown).

[0051] S4 measures distance and determines whether it is aligned:

[0052] like Figure 2 As shown, two horizontally symmetrical measuring points A and B are found on the auxiliary distance measuring plate 1 301. The horizontal distance between the two measuring points is equal to the length L of the line connecting the center points of the two key holes 1021 on the cross pin 102 (as shown in FIG. Figure 4 Then, a lever meter is used to measure the horizontal distances D1 and D2 between the two measuring points on the auxiliary distance measuring plate 1 301 and the two cylindrical ends 1022 of the cross pin 102 (i.e., the cylinders on both sides of the cross pin 102), and the difference between the two measured values ​​|D1-D2| is calculated; the length of the auxiliary distance measuring plate 2 302 is equal to the length of the line connecting the center points of the two key holes 1021 on the cross pin 102, as shown in FIG. Figure 3 As shown, a lever meter is used to measure the horizontal distances D3 and D4 between the two ends of the auxiliary distance measuring plate 2 302 and the auxiliary distance measuring plate 1 301 on one side thereof, and the difference between the two measured values ​​|D3-D4| is calculated; it is determined whether the above two differences are <0.03mm. If so, it indicates that the frame crosshead 1 of the ultra-high pressure compressor is aligned.

[0053] The method of this embodiment is used to adjust the frame crosshead 1 of the ultra-high pressure compressor, which can ensure the alignment accuracy and the stability of the intermediate body 101 and the crosshead pin 102 of the frame crosshead 1 on the sliding shoe 2. This alignment method can reduce the frequency of unplanned shutdowns caused by problems such as leakage of high-pressure packing and excessive vibration of the elastic rod, and help the ultra-high pressure compressor to operate stably for a long period of time, so that the ultra-high pressure compressor can achieve efficient production.

[0054] Example 2

[0055] Based on the embodiment 1, step S5 is further included: in step S4, if it is determined that the two differences are not within the allowable tolerance range, step S5 is performed:

[0056] S51 constructs the first right triangle: Figure 5-6 As shown, a horizontal vertical line is drawn from a measuring point of the auxiliary distance measuring plate 301 to the cylindrical end 1022 of the cross pin 102, and the vertical line segment from the bottom center point of the cross pin 102 to the horizontal vertical line is used as the long right angle side, and a vertical line is drawn from the bottom center point of the cross pin 102 to the outer end surface of the cylindrical end 1022 of the cross pin 102, and the line between the intersection of the vertical line and the horizontal vertical line and the bottom center point of the cross pin 102 is used as the hypotenuse, and the intersection of the long right angle side and the horizontal vertical line and the intersection of the hypotenuse and the horizontal vertical line are connected, and the line is used as the short right angle side to form a first right triangle;

[0057] S52 constructs the second right triangle: Figure 5 , 7 As shown, the vertical line segment from the bottom center point of the cross pin 102 to the short side of the bottom surface of the cross pin 102 with the keyhole 1021 is used as the long right-angled side, the bottom center point of the cross pin 102 is used as a vertical line to the auxiliary distance measuring plate 301, the intersection of the vertical line with the short side of the bottom surface of the cross pin 102 with the keyhole 1021 and the line between the bottom center point of the cross pin 102 is used as the hypotenuse, the intersection of the long right-angled side and the short side of the bottom surface of the cross pin 102 with the keyhole 1021 and the intersection of the hypotenuse and the short side of the bottom surface of the cross pin 102 with the keyhole 1021 are connected, and the line is used as the short right-angled side to form a second right triangle, and the second right triangle and the first right triangle are similar triangles;

[0058] S53 constructs the third right triangle: Figure 5 , 7 As shown, connect the two end points of the key hole 1021 on the bottom surface of the cross pin 102 close to the bottom center point of the cross pin 102, and make a perpendicular line from the bottom center point of the cross pin 102 to the short side of the bottom surface of the cross pin 102 with the key hole 1021, and make the line between the intersection of the two lines and the bottom center point of the cross pin 102 as the long right angle side; make a perpendicular line perpendicular to the right angle side from the intersection point, make a perpendicular line from the bottom center point of the cross pin 102 to the auxiliary distance measuring plate 1 301, make the intersection of the perpendicular line and the two end points of the key hole 1021 close to the bottom center point of the cross pin 102 and the line between the bottom center point of the cross pin 102, and make the line as the hypotenuse, and make the line segment between the intersection point of the long right angle side and the connection line and the intersection point of the hypotenuse and the connection line as the short right angle side, so as to form a third right triangle, and the third right triangle and the first right triangle are similar triangles;

[0059] S54 cutting the keyhole 1021 of the crosshead pin 102: measure the length L1 of the short right-angled side of the first right-angled triangle, and calculate the ratio of the length of the long right-angled side to the length of the short right-angled side according to the known length L2 of the long right-angled side; measure the lengths L3 and L4 of the long right-angled sides of the second and third right-angled triangles respectively, and calculate the lengths L5 and L6 of the short right-angled sides of the second and third right-angled triangles respectively according to the properties of similar triangles; according to the calculated lengths of the two short right-angled sides, draw two line segments parallel to the two short right-angled sides at the outer end points and inner end points of the two keyholes 1021 of the crosshead pin 102 respectively, the length of the line segment at the outer end point is equal to the length of the short right-angled side of the second right-angled triangle, and the length of the line segment at the inner end point is equal to the length of the short right-angled side of the third right-angled triangle; connect the end points of the two line segments, and the straight line segment obtained is the new side of the keyhole 1021 after cutting (such as Figure 5 , 7 shown);

[0060] S55 Alignment of the cross pin 102: Rotate the cross pin 102 so that the new side of the key hole 1021 is in close contact with the square key side wall of the lower sliding shoe 2, then tap the cross pin 102 so that the other side of the key hole 1021 is deformed and also in close contact with the square key side wall of the lower sliding shoe 2, thus completing the alignment of the cross pin 102, that is, completing the alignment of the frame cross head 1.

[0061] This embodiment innovatively uses the properties of similar triangles to calculate the distance that needs to be rotated when centering and aligning the crosshead pin 102, thereby ensuring the installation accuracy of the frame crosshead 1 of the ultra-high pressure compressor, further reducing the frequency of unplanned shutdowns due to problems such as leakage of high-pressure packing and excessive vibration of the elastic rod, and facilitating the long-term stable operation of the ultra-high pressure compressor, so that the ultra-high pressure compressor can reach a state of efficient production.

[0062] Example 3

[0063] On the basis of Example 2, after step S5 is completed, step S6 is performed: 1) repeating step S4 to check whether the two differences are less than 0.03 mm; 2) measuring the distances d between the top, bottom, left and right sides of the elastic rod and the middle body slide tube respectively 顶 ,d 底 ,d 左 ,d 右 , if d 顶 =0.1mm, d 左 =d 右 =0.05mm, and d 底 <0.02mm, it means that the frame crosshead 1 of the ultra-high pressure compressor is aligned.

[0064] This embodiment provides a two-step inspection and recheck measure to prevent the situation in which the service life of the elastic rod and the high-pressure packing is shortened due to the difference in alignment data.

[0065] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for centering and aligning a crosshead of a super-high pressure compressor frame, characterized in that: The following steps are involved: S1 Place the sliding shoe (2) of the frame crosshead (1) in the crankcase slideway and make it fit the guide rail on one side of the slideway; S2: Install auxiliary distance measuring plate 1 (301) at the positions of the crankcase corresponding to the two sides of the frame crosshead (1), and install auxiliary distance measuring plate 2 (302) at the position where the elastic rod coupling is installed on the frame crosshead (1); S3: Mounting the intermediate body (101) and the crosshead pin (102) of the frame crosshead (1) on the sliding shoe (2) accordingly; S4: finding two horizontally symmetrical measuring points on the auxiliary distance measuring plate 1 (301), the horizontal distance between the two measuring points being equal to the length of the line connecting the center points of the two keyholes (1021) on the cross pin (102); then measuring the horizontal distance between the two measuring points on the auxiliary distance measuring plate 1 (301) and the two cylindrical ends of the cross pin (102), and calculating the difference between the two measured values; the length of the auxiliary distance measuring plate 2 (302) being equal to the length of the line connecting the center points of the two keyholes (1021) on the cross pin (102), measuring the horizontal distance between the two ends of the auxiliary distance measuring plate 2 (302) and the auxiliary distance measuring plate 1 (301) on one side thereof, and calculating the difference between the two measured values; determining whether the above two differences are within the allowable tolerance range, if within the allowable tolerance range, it indicates that the frame crosshead (1) of the ultra-high pressure compressor is aligned.

2. The method for centering and aligning the crosshead of a super-high pressure compressor frame according to claim 1, characterized in that: In step S1, the distances between the long head side and the short head side of the sliding shoe (2) and the fitting guide rail are measured respectively. If the distances are less than 0.03 mm, it means that the sliding shoe (2) fits the guide rail.

3. The method for centering and aligning the crosshead of a super-high pressure compressor frame according to claim 2, characterized in that: In step S1, a feeler gauge is used to measure the distance between the long head side and the short head side of the sliding shoe (2) and the fitting guide rail.

4. The method for centering and aligning the crosshead of a frame of an ultra-high pressure compressor according to claim 1, characterized in that: In step S2, the auxiliary distance measuring plate 1 (301) is mounted on the pins on both sides of the crankcase corresponding to the frame crosshead (1), and the auxiliary distance measuring plate 1 (301) is provided with matching pin holes.

5. The method for centering and aligning the crosshead of a frame of an ultra-high pressure compressor according to claim 1, characterized in that: In step S2, the auxiliary distance measuring plate 2 (302) is provided with bolt holes adapted to the installation position of the elastic rod coupling.

6. The method for centering and aligning the crosshead of a frame of an ultra-high pressure compressor according to claim 1, characterized in that: In step S2, the auxiliary distance measuring plate 1 (301) and the auxiliary distance measuring plate 2 (302) are both made of stainless steel.

7. The method for centering and aligning the crosshead of a frame of an ultra-high pressure compressor according to claim 1, characterized in that: In step S4, the allowable tolerance range is less than 0.03 mm.

8. The method for centering and aligning the crosshead of a super-high pressure compressor frame according to claim 1, characterized in that: In step S4, the horizontal distances between the two measuring points on the auxiliary distance measuring plate 1 (301) and the two cylindrical ends (1022) of the cross pin (102) and the horizontal distances between the two ends of the auxiliary distance measuring plate 2 (302) and the auxiliary distance measuring plate 1 (301) on one side thereof are measured by a lever meter.

9. The method for centering and aligning the crosshead of a frame of an ultra-high pressure compressor according to claim 1, characterized in that: In step S4, if it is determined that the two differences are not within the allowable tolerance range, proceed to step S5: S51 constructs a first right-angled triangle: a horizontal vertical line is drawn from a measuring point of the auxiliary distance measuring plate 1 (301) to a cylindrical end portion (1022) of the cross pin (102), a vertical line segment from the center point of the bottom of the cross pin (102) to the horizontal vertical line is used as the long right-angled side, a vertical line is drawn from the center point of the bottom of the cross pin (102) to the outer end surface of the cylindrical end portion (1022) of the cross pin (102), a line connecting the intersection of the vertical line and the horizontal vertical line and the center point of the bottom of the cross pin (102) is used as the hypotenuse, a line connecting the intersection of the long right-angled side and the horizontal vertical line and the intersection of the hypotenuse and the horizontal vertical line is used as the short right-angled side, and the first right-angled triangle is formed; S52 constructs a second right triangle: a vertical line segment from the center point of the bottom of the cross pin (102) to the short side of the bottom surface of the cross pin (102) with the key hole (1021) is used as the long right side, a vertical line is made from the center point of the bottom of the cross pin (102) to the auxiliary distance measuring plate 1 (301), a line between the intersection of the vertical line and the short side of the bottom surface of the cross pin (102) with the key hole (1021) and the center point of the bottom of the cross pin (102) is used as the hypotenuse, a line is made between the intersection of the long right side and the short side of the bottom surface of the cross pin (102) with the key hole (1021) and the intersection of the hypotenuse and the short side of the bottom surface of the cross pin (102) with the key hole (1021), and the line is used as the short right side to form a second right triangle, and the second right triangle and the first right triangle are similar triangles; S53 constructs a third right triangle: connect the two end points of the keyhole (1021) on the bottom surface of the cross pin (102) close to the center point of the bottom of the cross pin (102), and make a perpendicular line from the center point of the bottom of the cross pin (102) to the short side of the bottom surface of the cross pin (102) with the keyhole (1021), and use the intersection of the two lines and the connection line between the center point of the bottom of the cross pin (102) as the long right angle side; use the intersection as a perpendicular line perpendicular to the right angle side, and use the intersection as the center point of the cross pin (102) to make a perpendicular line perpendicular to the right angle side. A perpendicular line is drawn from the bottom center point of (102) to the auxiliary distance measuring plate 1 (301), and a line is connected between the intersection of the perpendicular line and the two end points of the key hole (1021) near the bottom center point of the cross pin (102) and the bottom center point of the cross pin (102), with the line as the hypotenuse, and the line segment between the intersection point of the long right-angled side and the line and the intersection point of the hypotenuse and the line as the short right-angled side, to form a third right triangle, and the third right triangle and the first right triangle are similar triangles; S54 cutting the keyhole (1021) of the cross pin (102): measuring the length of the short right-angled side of the first right triangle, and calculating the ratio of the length of the long right-angled side to the length of the short right-angled side according to the known length of the long right-angled side; measuring the length of the long right-angled sides of the second right triangle and the third right triangle respectively, and calculating the length of the short right-angled sides of the second right triangle and the third right triangle respectively according to the properties of similar triangles; drawing two line segments parallel to the two short right-angled sides at the outer end points and the inner end points of the two keyholes (1021) of the cross pin (102) according to the calculated lengths of the two short right-angled sides, respectively, wherein the length of the line segment at the outer end point is equal to the length of the short right-angled side of the second right triangle, and the length of the line segment at the inner end point is equal to the length of the short right-angled side of the third right triangle; connecting the end points of the two line segments, and the straight line segment obtained is the new side of the keyhole (1021) after cutting; S55 Aligning the cross pin (102): Rotate the cross pin (102) so that the new side of the key hole (1021) is in close contact with the square key side wall of the lower sliding shoe (2), then tap the cross pin (102) so that the other side of the key hole (1021) is deformed and also in close contact with the square key side wall of the lower sliding shoe (2), thus completing the alignment of the cross pin (102), that is, completing the alignment of the frame cross head (1).

10. The method for centering and aligning the crosshead of a super-high pressure compressor frame according to claim 9, characterized in that: After step S5 is completed, proceed to step S6: 1) repeat the operation of step S4; 2) respectively measure the distance d between the top, bottom and left and right sides of the elastic rod and the middle body slide tube 顶 ,d 底 ,d 左 ,d 右 , if d 顶 =0.1mm, d 左 =d 右 =0.05mm, and d 底 <0.02mm, it means that the frame crosshead (1) of the ultra-high pressure compressor is aligned.

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