Method for mounting a double-shell coupling

Abstract

A kind of installation method of double mechanical seal coupling, the method comprises the following steps: first step: the first shaft segment and the second shaft segment are centered, the centering condition is checked using centering tool and two dial gauges, the position is adjusted until the difference meets the requirement;Rotating centering tool, check the centering condition again;Second step: the push-pull rod, feedback bracket and piston rod are fixed, the connection condition and position of push-pull rod and piston rod are adjusted until the requirement is met;Third step: use one to twelve double-end bolts and nuts to connect double mechanical seal coupling one by one;Adjust to make upper gap and lower gap same;Use torque from small to large, tighten one to twelve double-end bolts and nuts for multiple times, and make upper gap and lower gap same, until the set elongation is reached;Fourth step: carry out turning process, then check end face runout using dial gauge, adjust until end face runout meets the requirement.Therefore, the shaft segment centering is accurate and the installation quality of double mechanical seal coupling is good.

Description

TECHNICAL FIELD

[0001] The present application relates to a mechanical installation method, belonging to the field of mechanical installation, in particular to a kind of installation method of shell coupling. BACKGROUND

[0002] Shell coupling is composed of two split axially clamping shells, and double-end bolt nut is used to realize the clamping of two shaft sections. Shell coupling relies on the friction between the surfaces of two halves to transmit torque, and uses a key as an auxiliary coupling.

[0003] The Chinese patent with application number 201210416788.5 and application date October 28, 2012 discloses a kind of clamping shell coupling, which is characterized by being composed of two halves of left coupling body and right coupling body, the left half circular through slot is arranged on the inner end face of left coupling body along the axis, the left threaded hole is respectively arranged on the plane of upper side and lower side of inner end face, the left fastening plane is arranged on the opposite side of threaded hole on inner end face, the left bolt mounting hole is arranged on the left fastening plane, the right half circular through slot is arranged on the inner end face of right coupling body along the axis, the keyway is arranged on the inner wall of right half circular through slot along the axis, the right threaded hole is arranged on the inner end face corresponding to the left bolt mounting hole arranged on the outer end face of left coupling body, the right fastening plane is arranged on the outer end face, the right fastening plane is parallel to the left fastening plane, the right bolt mounting hole is arranged on the right fastening plane corresponding to the left threaded hole arranged on the inner end face of left coupling body, and the left coupling body is fixedly connected with the right coupling body through bolts. Although the design has the advantage of convenient disassembly and assembly, it still has the following defects:

[0004] The design does not check the centering of shaft sections, so the centering effect of shaft sections may be poor; the design also does not check the bolt elongation, so it may cause the loosening or abnormal vibration of shell coupling due to insufficient bolt elongation. Therefore, the centering of shaft sections and the installation quality of shell coupling are uncontrollable in the prior art.

[0005] The information disclosed in this background section is only intended to increase the understanding of the general background of the application, and should not be considered as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. SUMMARY

[0006] The purpose of the present application is to overcome the defects and problems of uncontrollable centering of shaft sections and installation quality of shell coupling in the prior art, and to provide an installation method of shell coupling with accurate centering of shaft sections and good installation quality.

[0007] To achieve the above purpose, the technical solution of the present application is:

[0008] A method for installing a double-shell coupling, the method comprising the following steps:

[0009] First step: first, place the first shaft segment and the second shaft segment in the air, then tightly attach the lower surface of the semicircular end of the centering tool to the upper surface of the first shaft segment, then place the platform end of the centering tool above the upper surface of the second shaft segment, then insert a first dial gauge into the middle measuring hole of the platform end, then insert a second dial gauge into the far measuring hole of the platform end, then read the readings of the first dial gauge and the second dial gauge, then calculate the difference between the readings of the first dial gauge and the second dial gauge; if the difference does not meet the requirements, adjust the positions of the first shaft segment and the second shaft segment until the difference meets the requirements; then rotate the centering tool to the side of the first shaft segment, then read the readings of the first dial gauge and the second dial gauge, then calculate the difference between the readings of the first dial gauge and the second dial gauge, if the difference does not meet the requirements, adjust the positions of the first shaft segment and the second shaft segment until the difference meets the requirements, and end the first step;

[0010] Second step: first, install the feedback bracket in the feedback groove of the left double-shell coupling, then fix the feedback bracket, then connect and fix the push-pull rod to one end of the left double-shell coupling, then connect and fix the piston rod to the other end of the left double-shell coupling, then check whether the push-pull rod and the piston rod are tightly attached to the left double-shell coupling through the observation hole, then observe whether the push-pull rod and the piston rod are in the middle position of the feedback groove, if the above requirements are not met, adjust the positions of the push-pull rod and the piston rod, and end the second step;

[0011] The third step is: first, align the right connecting end of the right clamping shell coupling with the left connecting end of the left clamping shell coupling, then connect the right clamping shell coupling with the left clamping shell coupling by using one to twelve double-headed bolts and nuts one by one, the assembly mode of a single double-headed bolt and nut is that the double-headed bolt is first inserted into the right clamping shell coupling and the left clamping shell coupling, and then the nuts are screwed on both ends of the double-headed bolt; then measure the width value of the upper gap between the right connecting end and the left connecting end, and then compare whether the width values of the upper gap and the lower gap are equal, if the values are not equal, loosen the nuts one by one, adjust the position of the right clamping shell coupling, move the right clamping shell coupling towards the direction of the larger gap value, until the width values of the upper gap and the lower gap are equal; then measure the length values of the upper gap and the lower gap, and then compare whether the length values of the upper gap and the lower gap are equal, if the length values are not equal, adjust the positions of the right clamping shell coupling and the left clamping shell coupling, until the length values of the upper gap and the lower gap are equal; then tighten one to twelve double-headed bolts and nuts according to the foregoing order by using a smaller torque, then measure the width values of the upper gap and the lower gap, adjust the positions of the right clamping shell coupling and the left clamping shell coupling to make the width values of the upper gap and the lower gap equal, then measure the length value of the upper gap, adjust the positions of the right clamping shell coupling and the left clamping shell coupling to make the length values of the upper gap and the lower gap equal, then increase the torque, tighten one to twelve double-headed bolts and nuts again according to the foregoing order, then check the length and width values of the upper gap and the lower gap, then adjust the positions of the right clamping shell coupling and the left clamping shell coupling to make the width values of the upper gap and the lower gap equal, and also make the length values of the upper gap and the lower gap equal; then gradually increase the torque and tighten for multiple rounds according to the foregoing order, until one to twelve double-headed bolts and nuts reach the set elongation, and the third step is ended.

[0012] The fourth step is: first, perform the jiggering process on the first shaft segment and the second shaft segment, then check the end face runout of the feedback ring by using a three-number dial indicator, if the runout does not meet the requirements, adjust between the feedback ring and the feedback bracket until the end face runout of the feedback ring meets the requirements, and the fourth step is ended.

[0013] In the third step, the sequence of connecting the right clamping shell coupling with the left clamping shell coupling by one to twelve double-headed bolts and nuts one by one is: one double-headed bolt and nut, two double-headed bolt and nut, three double-headed bolt and nut, four double-headed bolt and nut, five double-headed bolt and nut, six double-headed bolt and nut, seven double-headed bolt and nut, eight double-headed bolt and nut, nine double-headed bolt and nut, ten double-headed bolt and nut, eleven double-headed bolt and nut, and twelve double-headed bolt and nut.

[0014] In the third step, the first to twelfth double-headed bolts and nuts are connected to the right and left split-couplings in the following order: No. 1 double-headed bolt and nut - No. 2 double-headed bolt and nut - No. 3 double-headed bolt and nut - No. 4 double-headed bolt and nut - No. 9 double-headed bolt and nut - No. 10 double-headed bolt and nut - No. 11 double-headed bolt and nut - No. 12 double-headed bolt and nut - No. 5 double-headed bolt and nut - No. 6 double-headed bolt and nut - No. 7 double-headed bolt and nut - No. 8 double-headed bolt and nut.

[0015] In the third step, the first to twelfth double-headed bolts and nuts are connected to the right and left split-couplings in the following order: No. 5 double-headed bolt and nut - No. 6 double-headed bolt and nut - No. 7 double-headed bolt and nut - No. 8 double-headed bolt and nut - No. 1 double-headed bolt and nut - No. 2 double-headed bolt and nut - No. 3 double-headed bolt and nut - No. 4 double-headed bolt and nut - No. 9 double-headed bolt and nut - No. 10 double-headed bolt and nut - No. 11 double-headed bolt and nut - No. 12 double-headed bolt and nut.

[0016] In the third step, the first to twelfth double-headed bolts and nuts are connected to the right and left split-couplings in the following order: No. 5 double-headed bolt and nut - No. 6 double-headed bolt and nut - No. 7 double-headed bolt and nut - No. 8 double-headed bolt and nut - No. 9 double-headed bolt and nut - No. 10 double-headed bolt and nut - No. 11 double-headed bolt and nut - No. 12 double-headed bolt and nut - No. 1 double-headed bolt and nut - No. 2 double-headed bolt and nut - No. 3 double-headed bolt and nut - No. 4 double-headed bolt and nut.

[0017] In the third step, the first to twelfth double-headed bolts and nuts are connected to the right and left split-couplings in the following order: No. 9 double-headed bolt and nut - No. 10 double-headed bolt and nut - No. 11 double-headed bolt and nut - No. 12 double-headed bolt and nut - No. 1 double-headed bolt and nut - No. 2 double-headed bolt and nut - No. 3 double-headed bolt and nut - No. 4 double-headed bolt and nut - No. 5 double-headed bolt and nut - No. 6 double-headed bolt and nut - No. 7 double-headed bolt and nut - No. 8 double-headed bolt and nut.

[0018] In the third step, the first to twelfth double-headed bolts and nuts are connected to the right and left split-couplings in the following order: No. 9 double-headed bolt and nut - No. 10 double-headed bolt and nut - No. 11 double-headed bolt and nut - No. 12 double-headed bolt and nut - No. 5 double-headed bolt and nut - No. 6 double-headed bolt and nut - No. 7 double-headed bolt and nut - No. 8 double-headed bolt and nut - No. 1 double-headed bolt and nut - No. 2 double-headed bolt and nut - No. 3 double-headed bolt and nut - No. 4 double-headed bolt and nut.

[0019] The right split-coupling and the left split-coupling are mirror-symmetric in structure;

[0020] The right split-coupling comprises a first nut groove, a second nut groove, a third nut groove and a fourth nut groove;

[0021] The first nut groove and the second nut groove are radially symmetrical along the right clamp shell coupling, the third nut groove and the fourth nut groove are radially symmetrical along the right clamp shell coupling, and the first nut groove and the third nut groove are axially symmetrical along the right clamp shell coupling.

[0022] The first nut groove includes a No. 9 double-headed bolt nut, a No. 2 double-headed bolt nut and a No. 8 double-headed bolt nut, the No. 9 double-headed bolt nut is located at a position close to the outside of the right clamp shell coupling in the first nut groove, the No. 8 double-headed bolt nut is located at a position close to the inside of the right clamp shell coupling in the first nut groove, and the No. 2 double-headed bolt nut is located between the No. 9 double-headed bolt nut and the No. 8 double-headed bolt nut.

[0023] The second nut groove includes a No. 5 double-headed bolt nut, a No. 4 double-headed bolt nut and a No. 12 double-headed bolt nut, the No. 12 double-headed bolt nut is located at a position close to the outside of the right clamp shell coupling in the second nut groove, the No. 5 double-headed bolt nut is located at a position close to the inside of the right clamp shell coupling in the second nut groove, and the No. 4 double-headed bolt nut is located between the No. 5 double-headed bolt nut and the No. 12 double-headed bolt nut.

[0024] The third nut groove includes a No. 10 double-headed bolt nut, a No. 1 double-headed bolt nut and a No. 7 double-headed bolt nut, the No. 10 double-headed bolt nut is located at a position close to the outside of the right clamp shell coupling in the third nut groove, the No. 7 double-headed bolt nut is located at a position close to the inside of the right clamp shell coupling in the third nut groove, and the No. 1 double-headed bolt nut is located between the No. 10 double-headed bolt nut and the No. 7 double-headed bolt nut.

[0025] The fourth nut groove includes a No. 6 double-headed bolt nut, a No. 3 double-headed bolt nut and a No. 11 double-headed bolt nut, the No. 11 double-headed bolt nut is located at a position close to the outside of the right clamp shell coupling in the fourth nut groove, the No. 6 double-headed bolt nut is located at a position close to the inside of the right clamp shell coupling in the fourth nut groove, and the No. 3 double-headed bolt nut is located between the No. 6 double-headed bolt nut and the No. 11 double-headed bolt nut.

[0026] The first support point is at the upper end of the feedback bracket, the second support point is at the lower end of the feedback bracket, the third support point is at the right side of the upper end of the feedback bracket, and the fourth support point is at the right side of the lower end of the feedback bracket.

[0027] The method includes a centering tool, the centering tool includes a semicircular end and a platform end, the semicircular end is connected with the platform end, the platform end includes a middle measuring hole and a far measuring hole, and the far measuring hole extends in a direction away from the semicircular end of the middle measuring hole.

[0028] The middle measuring hole is a through hole penetrating the platform end, and the far measuring hole is a through hole penetrating the platform end.

[0029] The present application has the following advantages compared to the prior art:

[0030] 1. The installation method of the double-shell coupling, comprising the following steps: first, place the first shaft segment and the second shaft segment apart from each other in the center, then tightly attach the lower surface of the semicircular end of the centering tool to the upper surface of the first shaft segment, then place the platform end of the centering tool above the upper surface of the second shaft segment, then insert a first dial gauge into the middle measuring hole of the platform end, then insert a second dial gauge into the distal measuring hole of the platform end, then read the readings of the first dial gauge and the second dial gauge, then calculate the difference between the readings of the first dial gauge and the second dial gauge, if the difference does not meet the requirements, adjust the positions of the first shaft segment and the second shaft segment until the difference meets the requirements, then rotate the centering tool to the side of the first shaft segment, then read the readings of the first dial gauge and the second dial gauge, then calculate the difference between the readings of the first dial gauge and the second dial gauge, if the difference does not meet the requirements, adjust the positions of the first shaft segment and the second shaft segment until the difference meets the requirements, and the first step is completed; second, install the feedback bracket in the feedback groove of the left double-shell coupling, then fix the feedback bracket, then connect and fix the push-pull rod to one end of the left double-shell coupling, then connect and fix the piston rod to the other end of the left double-shell coupling, then check whether the push-pull rod and the piston rod are tightly attached to the left double-shell coupling through the observation hole, then check whether the push-pull rod and the piston rod are in the middle position of the feedback groove, if the above requirements are not met, adjust the positions of the push-pull rod and the piston rod, and the second step is completed; third, align the right connecting end of the right double-shell coupling with the left connecting end of the left double-shell coupling, then connect the right double-shell coupling and the left double-shell coupling by using the first to twelfth double-headed bolts and nuts one by one, the assembly mode of each double-headed bolt and nut is that the double-headed bolt is inserted into the right double-shell coupling and the left double-shell coupling, and then the nuts are screwed on the two ends of the double-headed bolt, then measure the width value of the upper gap between the right connecting end and the left connecting end, then compare whether the width values of the upper gap and the lower gap are equal, if the values are not equal, loosen the nuts one by one, then adjust the position of the right double-shell coupling so that the right double-shell coupling moves towards the direction of the larger gap value until the width values of the upper gap and the lower gap are equal, then measure the length values of the upper gap and the lower gap, then compare whether the length values of the upper gap and the lower gap are equal, if the length values are not equal, adjust the positions of the right double-shell coupling and the left double-shell coupling until the length values of the upper gap and the lower gap are equal.Then the smaller torque is used to tighten the No. 1 to No. 12 double head bolt nuts in the aforementioned order, and then the width values of the upper gap and the lower gap are measured, the positions of the right clamping shell coupling and the left clamping shell coupling are adjusted to make the width values of the upper gap and the lower gap equal, then the length values of the upper gap and the lower gap are measured, the positions of the right clamping shell coupling and the left clamping shell coupling are adjusted to make the length values of the upper gap and the lower gap equal, then the torque is increased, the No. 1 to No. 12 double head bolt nuts are tightened again in the aforementioned order, and then the length and width values of the upper gap and the lower gap are checked, the positions of the right clamping shell coupling and the left clamping shell coupling are adjusted to make the width values of the upper gap and the lower gap equal, and the length values of the upper gap and the lower gap also equal; the torque is gradually increased and the tightening is carried out in the aforementioned order for multiple rounds until the No. 1 to No. 12 double head bolt nuts reach the set elongation, and the third step is ended; the fourth step is that the No. 1 shaft segment and the No. 2 shaft segment are subjected to the turning process, and then the end face runout of the feedback ring is checked by using the No. 3 dial gauge, if the runout does not meet the requirements, the adjustment is carried out between the feedback ring and the feedback support until the end face runout of the feedback ring meets the requirements, and the fourth step is ended.

[0031] 2. In the installation method of the split coupling, in the third step, the sequence of connecting the right split coupling and the left split coupling by the first to the twelfth double-headed bolts and nuts is: the first double-headed bolt and nut, the second double-headed bolt and nut, the third double-headed bolt and nut, the fourth double-headed bolt and nut, the fifth double-headed bolt and nut, the sixth double-headed bolt and nut, the seventh double-headed bolt and nut, the eighth double-headed bolt and nut, the ninth double-headed bolt and nut, the tenth double-headed bolt and nut, the eleventh double-headed bolt and nut, and the twelfth double-headed bolt and nut; in the third step, the sequence of connecting the right split coupling and the left split coupling by the first to the twelfth double-headed bolts and nuts is: the first double-headed bolt and nut, the second double-headed bolt and nut, the third double-headed bolt and nut, the fourth double-headed bolt and nut, the ninth double-headed bolt and nut, the tenth double-headed bolt and nut, the eleventh double-headed bolt and nut, the twelfth double-headed bolt and nut, the fifth double-headed bolt and nut, the sixth double-headed bolt and nut, the seventh double-headed bolt and nut, and the eighth double-headed bolt and nut; in the third step, the sequence of connecting the right split coupling and the left split coupling by the first to the twelfth double-headed bolts and nuts is: the fifth double-headed bolt and nut, the sixth double-headed bolt and nut, the seventh double-headed bolt and nut, the eighth double-headed bolt and nut, the first double-headed bolt and nut, the second double-headed bolt and nut, the third double-headed bolt and nut, the fourth double-headed bolt and nut, the ninth double-headed bolt and nut, the tenth double-headed bolt and nut, the eleventh double-headed bolt and nut, and the twelfth double-headed bolt and nut; in the third step, the sequence of connecting the right split coupling and the left split coupling by the first to the twelfth double-headed bolts and nuts is: the fifth double-headed bolt and nut, the sixth double-headed bolt and nut, the seventh double-headed bolt and nut, the eighth double-headed bolt and nut, the ninth double-headed bolt and nut, the tenth double-headed bolt and nut, the eleventh double-headed bolt and nut, the twelfth double-headed bolt and nut, the first double-headed bolt and nut, the second double-headed bolt and nut, the third double-headed bolt and nut, and the fourth double-headed bolt and nut; in the third step, the sequence of connecting the right split coupling and the left split coupling by the first to the twelfth double-headed bolts and nuts is: the ninth double-headed bolt and nut, the tenth double-headed bolt and nut, the eleventh double-headed bolt and nut, the twelfth double-headed bolt and nut, the first double-headed bolt and nut, the second double-headed bolt and nut, the third double-headed bolt and nut, the fourth double-headed bolt and nut, the fifth double-headed bolt and nut, the sixth double-headed bolt and nut, the seventh double-headed bolt and nut, and the eighth double-headed bolt and nut.In the third step, the first to the twelfth double-end bolts and nuts are sequentially connected to the right and left clamp shell couplings in the following order: No. 9 double-end bolt and nut, No. 10 double-end bolt and nut, No. 11 double-end bolt and nut, No. 12 double-end bolt and nut, No. 5 double-end bolt and nut, No. 6 double-end bolt and nut, No. 7 double-end bolt and nut, No. 8 double-end bolt and nut, No. 1 double-end bolt and nut, No. 2 double-end bolt and nut, No. 3 double-end bolt and nut, and No. 4 double-end bolt and nut. In use, the bolts are tightened according to the above-mentioned sequence. Every four tightened bolts form a group. The front and rear tightened bolts in the group are symmetrically arranged along the axial direction, the radial direction or the center point of the clamp shell coupling. Therefore, the bolt stress is favorable, the clamp shell coupling is stable during the tightening of the bolts, and the elongation of the double-end bolt and nut can meet the design requirements. Thus, the clamp shell coupling is accurately fixed.

[0032] 3. The installation method of the split coupling, wherein the right split coupling and the left split coupling are mirror-symmetrically structured; the right split coupling comprises a first nut groove, a second nut groove, a third nut groove and a fourth nut groove; the first nut groove and the second nut groove are radially symmetrical along the right split coupling, the third nut groove and the fourth nut groove are radially symmetrical along the right split coupling, and the first nut groove and the third nut groove are axially symmetrical along the right split coupling; the first nut groove comprises a ninth double-headed bolt nut, a second double-headed bolt nut and an eighth double-headed bolt nut, the ninth double-headed bolt nut is located at a position close to the outer part of the right split coupling in the first nut groove, the eighth double-headed bolt nut is located at a position close to the inner part of the right split coupling in the first nut groove, and the second double-headed bolt nut is located between the ninth double-headed bolt nut and the eighth double-headed bolt nut; the second nut groove comprises a fifth double-headed bolt nut, a fourth double-headed bolt nut and a twelfth double-headed bolt nut, the twelfth double-headed bolt nut is located at a position close to the outer part of the right split coupling in the second nut groove, the fifth double-headed bolt nut is located at a position close to the inner part of the right split coupling in the second nut groove, and the fourth double-headed bolt nut is located between the fifth double-headed bolt nut and the twelfth double-headed bolt nut; the third nut groove comprises a tenth double-headed bolt nut, a first double-headed bolt nut and a seventh double-headed bolt nut, the tenth double-headed bolt nut is located at a position close to the outer part of the right split coupling in the third nut groove, the seventh double-headed bolt nut is located at a position close to the inner part of the right split coupling in the third nut groove, and the first double-headed bolt nut is located between the tenth double-headed bolt nut and the seventh double-headed bolt nut; the fourth nut groove comprises a sixth double-headed bolt nut, a third double-headed bolt nut and an eleventh double-headed bolt nut, the eleventh double-headed bolt nut is located at a position close to the outer part of the right split coupling in the fourth nut groove, the sixth double-headed bolt nut is located at a position close to the inner part of the right split coupling in the fourth nut groove, and the third double-headed bolt nut is located between the sixth double-headed bolt nut and the eleventh double-headed bolt nut; in use, the left split coupling is aligned with the right split coupling, and then the double-headed bolt nuts are used to connect the left split coupling and the right split coupling one by one, the first nut groove, the second nut groove, the third nut groove and the fourth nut groove are distributed along the axial direction or the radial direction of the split coupling, so that the split coupling is locked from the upper part and the lower part of the two shaft segments, and has good shaft segment connection effect, and each nut groove has three double-headed bolt nuts, which ensures the stability of the locking. Therefore, the split coupling has good connection effect.

[0033] 4、The installation method of the split coupling, the first support point is at the upper end of the feedback support, the second support point is at the lower end of the feedback support, the third support point is at the right side of the upper end of the feedback support, and the fourth support point is at the right side of the lower end of the feedback support, when the feedback support is fixed at the first support point, the second support point, the third support point and the fourth support point, the rotating connection of the push-pull rod and the movable rod with the middle opening of the feedback support is carried out, when the push-pull rod and the movable rod are rotated, the torque applied to the push-pull rod and the movable rod can make the feedback support rotate, in order to avoid the rotation of the feedback support, the feedback support is fixed, so that the feedback support will not rotate due to the rotating push-pull rod and the movable rod, and the installation precision is improved. Therefore, the installation precision is high.

[0034] 5、The installation method of the split coupling, the method includes a centering tool, the centering tool includes a semicircular end and a platform end, the semicircular end is connected with the platform end, the platform end includes a middle measuring hole and a far measuring hole, the far measuring hole extends away from the middle measuring hole in the direction away from the semicircular end, the middle measuring hole is a through hole penetrating through the platform end, and the far measuring hole is a through hole penetrating through the platform end, in application, first, the semicircular end is attached to the upper surface of the first shaft segment, then the platform end is placed on the upper surface of the second shaft segment, then a first dial gauge is inserted into the middle measuring hole, a second dial gauge is inserted into the far measuring hole, then the readings on the first dial gauge and the second dial gauge are read respectively, the difference between the readings is calculated, the position difference between the first shaft segment and the second shaft segment in the vertical direction is obtained, the positions of the first shaft segment and the second shaft segment are adjusted according to requirements, then the centering tool is rotated to the side of the first shaft segment, the readings of the first dial gauge and the second dial gauge are read again, the difference between the readings is calculated, the position difference between the first shaft segment and the second shaft segment in the horizontal direction is obtained, and the positions of the first shaft segment and the second shaft segment are adjusted according to requirements, the centering tool cooperates with the first dial gauge and the second dial gauge to judge whether the first shaft segment and the second shaft segment are centered by measuring the distance, and the error generated by naked eye observation or ruler measurement is reduced. Therefore, the shaft segment centering is accurate. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the application.

[0036] Figure 2 It is a structural schematic diagram of the first step in the application.

[0037] Figure 3 It is Figure 2 the left view of the centering tool in the application.

[0038] Figure 4 It is Figure 2 the front view of the centering tool in the application.

[0039] Figure 5 is Figure 2 is a top view of the centering tool.

[0040] Figure 6 is a structure diagram of the second step in the application.

[0041] Figure 7 is Figure 6 is a structure diagram of the feedback bracket in the application.

[0042] Figure 8 is a structure diagram of the third step in the application.

[0043] Figure 9 is Figure 8 is a structure diagram of the clamping shell coupling in the application.

[0044] Figure 10 is a structure diagram of the fourth step in the application.

[0045] In the figure: No. 1 shaft segment 1, No. 2 shaft segment 2, centering tool 3, semicircular end 31, platform end 32, middle measuring hole 321, far measuring hole 322, No. 1 dial gauge 323, No. 2 dial gauge 324, feedback bracket 4, left port 41, right port 42, observation hole 43, No. 1 support point 44, No. 2 support point 45, No. 3 support point 46, No. 4 support point 47, feedback ring 48, gasket 49, clamping shell coupling 5, left clamping shell coupling 51, left connecting end 511, right clamping shell coupling 52, right connecting end 521, feedback groove 53, upper gap 54, lower gap 55, No. 1 nut groove 56, No. 2 nut groove 57, No. 3 nut groove 58, No. 4 nut groove 59, push-pull rod 6, piston rod 7, No. 3 dial gauge 8, No. 1 to No. 12 double-headed bolt nuts 9, No. 1 double-headed bolt nut 91, No. 2 double-headed bolt nut 92, No. 3 double-headed bolt nut 93, No. 4 double-headed bolt nut 94, No. 5 double-headed bolt nut 95, No. 6 double-headed bolt nut 96, No. 7 double-headed bolt nut 97, No. 8 double-headed bolt nut 98, No. 9 double-headed bolt nut 99, No. 10 double-headed bolt nut 910, No. 11 double-headed bolt nut 911, No. 12 double-headed bolt nut 912, single double-headed bolt nut 10, double-headed bolt 101, nut 102. DETAILED DESCRIPTION

[0046] The application is further described in detail in the following description and specific embodiments in conjunction with the accompanying drawings.

[0047] Please refer to Figure 1 — Figure 10 A clamping shell coupling installation method, the method comprising the following steps:

[0048] The first step: first, the first shaft segment 1 and the second shaft segment 2 are placed in the center, then the lower surface of the semicircular end 31 of the centering tool 3 is close to the upper surface of the first shaft segment 1, then the platform end 32 of the centering tool 3 is placed above the upper surface of the second shaft segment 2, then the first dial gauge 323 is inserted into the middle measuring hole 321 of the platform end 32, then the second dial gauge 324 is inserted into the far measuring hole 322 of the platform end 32, then the readings of the first dial gauge 323 and the second dial gauge 324 are read, and the difference between the readings is calculated; if the difference does not meet the requirements, the positions of the first shaft segment 1 and the second shaft segment 2 are adjusted until the difference meets the requirements; then the centering tool 3 is rotated to the side of the first shaft segment 1, and the readings of the first dial gauge 323 and the second dial gauge 324 are read, and the difference between the readings is calculated; if the difference does not meet the requirements, the positions of the first shaft segment 1 and the second shaft segment 2 are adjusted until the difference meets the requirements, and the first step is completed.

[0049] The second step: first, the feedback bracket 4 is installed in the feedback groove 53 of the left clamping shell coupling 51, then the feedback bracket 4 is fixed, then the push-pull rod 6 is connected and fixed with one end of the left clamping shell coupling 51, then the piston rod 7 is connected and fixed with the other end of the left clamping shell coupling 51, then whether the push-pull rod 6 and the piston rod 7 are close to the left clamping shell coupling 51 is checked through the observation hole 43, and whether the push-pull rod 6 and the piston rod 7 are in the middle position of the feedback groove 53 is observed; if the above requirements are not met, the positions of the push-pull rod 6 and the piston rod 7 are adjusted, and the second step is completed.

[0050] Third step: first, align the right connecting end 521 of the right clamp shell coupling 52 with the left connecting end 511 of the left clamp shell coupling 51, then connect the right clamp shell coupling 52 with the left clamp shell coupling 51 using one to twelve double-headed bolts and nuts 9 one by one, the assembly method of each double-headed bolt and nut 10 is to first insert the double-headed bolt 101 into the right clamp shell coupling 52 and the left clamp shell coupling 51, then screw the nut 102 on both ends of the double-headed bolt 101; then measure the width value of the upper gap 54 between the right connecting end 521 and the left connecting end 511, then compare whether the width values of the upper gap 54 and the lower gap 55 are equal, if the values are not equal, loosen the nuts 102 one by one, then adjust the position of the right clamp shell coupling 52, move the right clamp shell coupling 52 towards the direction of the larger gap value, until the width values of the upper gap 54 and the lower gap 55 are equal; then measure the length values of the upper gap 54 and the lower gap 55, and compare whether the length values of the upper gap 54 and the lower gap 55 are equal, if the length values are not equal, adjust the positions of the right clamp shell coupling 52 and the left clamp shell coupling 51, until the length values of the upper gap 54 and the lower gap 55 are equal; then tighten one to twelve double-headed bolts and nuts 9 in the previous order using a smaller torque, then measure the width values of the upper gap 54 and the lower gap 55, adjust the positions of the right clamp shell coupling 52 and the left clamp shell coupling 51 to make the width values of the upper gap 54 and the lower gap 55 equal, then measure the length value of the upper gap 54, adjust the positions of the right clamp shell coupling 52 and the left clamp shell coupling 51 to make the length values of the upper gap 54 and the lower gap 55 equal, then increase the torque, tighten one to twelve double-headed bolts and nuts 9 again in the previous order, then check the length and width values of the upper gap 54 and the lower gap 55, then adjust the positions of the right clamp shell coupling 52 and the left clamp shell coupling 51 to make the width values of the upper gap 54 and the lower gap 55 equal, and also make the length values of the upper gap 54 and the lower gap 55 equal; then gradually increase the torque and tighten for multiple rounds in the previous order, until one to twelve double-headed bolts and nuts 9 reach the set elongation, ending the third step.

[0051] Fourth step: first, perform the jiggering process on the first shaft segment 1 and the second shaft segment 2, then use the third dial indicator 8 to check the end face runout of the feedback ring 48, if the runout does not meet the requirements, adjust between the feedback ring 48 and the feedback bracket 4 until the end face runout of the feedback ring 48 meets the requirements, ending the fourth step.

[0052] The third step, the first to the twelfth double head bolt nut 9 one by one to the right and left clamping shell coupling 52 coupling 51 for the connection of the order: the first double head bolt nut 91- the second double head bolt nut 92- the third double head bolt nut 93- the fourth double head bolt nut 94- the fifth double head bolt nut 95- the sixth double head bolt nut 96- the seventh double head bolt nut 97- the eighth double head bolt nut 98- the ninth double head bolt nut 99- the tenth double head bolt nut 910- the eleventh double head bolt nut 911- the twelfth double head bolt nut 912.

[0053] The third step, the first to the twelfth double head bolt nut 9 one by one to the right and left clamping shell coupling 52 coupling 51 for the connection of the order: the first double head bolt nut 91- the second double head bolt nut 92- the third double head bolt nut 93- the fourth double head bolt nut 94- the ninth double head bolt nut 99- the tenth double head bolt nut 910- the eleventh double head bolt nut 911- the twelfth double head bolt nut 912- the fifth double head bolt nut 95- the sixth double head bolt nut 96- the seventh double head bolt nut 97- the eighth double head bolt nut 98.

[0054] The third step, the first to the twelfth double head bolt nut 9 one by one to the right and left clamping shell coupling 52 coupling 51 for the connection of the order: the fifth double head bolt nut 95- the sixth double head bolt nut 96- the seventh double head bolt nut 97- the eighth double head bolt nut 98- the first double head bolt nut 91- the second double head bolt nut 92- the third double head bolt nut 93- the fourth double head bolt nut 94- the ninth double head bolt nut 99- the tenth double head bolt nut 910- the eleventh double head bolt nut 911- the twelfth double head bolt nut 912.

[0055] The third step, the first to the twelfth double head bolt nut 9 one by one to the right and left clamping shell coupling 52 coupling 51 for the connection of the order: the fifth double head bolt nut 95- the sixth double head bolt nut 96- the seventh double head bolt nut 97- the eighth double head bolt nut 98- the ninth double head bolt nut 99- the tenth double head bolt nut 910- the eleventh double head bolt nut 911- the twelfth double head bolt nut 912- the first double head bolt nut 91- the second double head bolt nut 92- the third double head bolt nut 93- the fourth double head bolt nut 94.

[0056] In the third step, the first to twelfth double-headed bolt nuts 9 are connected to the right clamping shell coupling 52 and the left clamping shell coupling 51 in the following order: the ninth double-headed bolt nut 99, the tenth double-headed bolt nut 910, the eleventh double-headed bolt nut 911, the twelfth double-headed bolt nut 912, the fifth double-headed bolt nut 95, the sixth double-headed bolt nut 96, the seventh double-headed bolt nut 97, the eighth double-headed bolt nut 98, the first double-headed bolt nut 91, the second double-headed bolt nut 92, and the third double-headed bolt nut 93.

[0057] In the third step, the first to twelfth double-headed bolt nuts 9 are connected to the right clamping shell coupling 52 and the left clamping shell coupling 51 in the following order: the ninth double-headed bolt nut 99, the tenth double-headed bolt nut 910, the eleventh double-headed bolt nut 911, the twelfth double-headed bolt nut 912, the fifth double-headed bolt nut 95, the sixth double-headed bolt nut 96, the seventh double-headed bolt nut 97, the eighth double-headed bolt nut 98, the first double-headed bolt nut 91, the second double-headed bolt nut 92, and the third double-headed bolt nut 93.

[0058] The right clamping shell coupling 52 and the left clamping shell coupling 51 are mirror-symmetrically structured;

[0059] The right clamping shell coupling 52 includes a first nut groove 56, a second nut groove 57, a third nut groove 58, and a fourth nut groove 59;

[0060] The first nut groove 56 and the second nut groove 57 are radially symmetric along the right clamping shell coupling 52, the third nut groove 58 and the fourth nut groove 59 are radially symmetric along the right clamping shell coupling 52, and the first nut groove 56 and the third nut groove 58 are axially symmetric along the right clamping shell coupling 52;

[0061] The first nut groove 56 includes the ninth double-headed bolt nut 99, the second double-headed bolt nut 92, and the eighth double-headed bolt nut 98, the ninth double-headed bolt nut 99 is located at a position close to the outside of the right clamping shell coupling 52 in the first nut groove 56, the eighth double-headed bolt nut 98 is located at a position close to the inside of the right clamping shell coupling 52 in the first nut groove 56, and the second double-headed bolt nut 92 is located between the ninth double-headed bolt nut 99 and the eighth double-headed bolt nut 98;

[0062] The No. 2 nut groove 57 includes No. 5 double-headed bolt nut 95, No. 4 double-headed bolt nut 94 and No. 12 double-headed bolt nut 912. The No. 12 double-headed bolt nut 912 is located at the position of the No. 2 nut groove 57 close to the outside of the right clamping shell coupling 52. The No. 5 double-headed bolt nut 95 is located at the position of the No. 2 nut groove 57 close to the inside of the right clamping shell coupling 52. The No. 4 double-headed bolt nut 94 is located between the No. 5 double-headed bolt nut 95 and the No. 12 double-headed bolt nut 912.

[0063] The No. 3 nut groove 58 includes No. 10 double-headed bolt nut 910, No. 1 double-headed bolt nut 91 and No. 7 double-headed bolt nut 97. The No. 10 double-headed bolt nut 910 is located at the position of the No. 3 nut groove 58 close to the outside of the right clamping shell coupling 52. The No. 7 double-headed bolt nut 97 is located at the position of the No. 3 nut groove 58 close to the inside of the right clamping shell coupling 52. The No. 1 double-headed bolt nut 91 is located between the No. 10 double-headed bolt nut 910 and the No. 7 double-headed bolt nut 97.

[0064] The No. 4 nut groove 59 includes No. 6 double-headed bolt nut 96, No. 3 double-headed bolt nut 93 and No. 11 double-headed bolt nut 911. The No. 11 double-headed bolt nut 911 is located at the position of the No. 4 nut groove 59 close to the outside of the right clamping shell coupling 52. The No. 6 double-headed bolt nut 96 is located at the position of the No. 4 nut groove 59 close to the inside of the right clamping shell coupling 52. The No. 3 double-headed bolt nut 93 is located between the No. 6 double-headed bolt nut 96 and the No. 11 double-headed bolt nut 911.

[0065] The No. 1 support point 44 is located at the upper end of the feedback bracket 4. The No. 2 support point 45 is located at the lower end of the feedback bracket 4. The No. 3 support point 46 is located at the right side of the upper end of the feedback bracket 4. The No. 4 support point 47 is located at the right side of the lower end of the feedback bracket 4.

[0066] The method includes a centering tool 3. The centering tool 3 includes a semicircular end 31 and a platform end 32. The semicircular end 31 is connected with the platform end 32. The platform end 32 includes a middle measuring hole 321 and a far measuring hole 322. The far measuring hole 322 extends in the direction away from the semicircular end 31 of the middle measuring hole 321.

[0067] The middle measuring hole 321 is a through hole penetrating the platform end 32. The far measuring hole 322 is a through hole penetrating the platform end 32.

[0068] The principle of the present application is described as follows.

[0069] The clamping shell coupling 5 on the propeller shaft system is generally used for fixed connection between two shaft sections and transmission of shaft system torque. Usually, the feedback bracket 4 and the pitch feedback mechanism are also installed on the clamping shell coupling 5 for indicating and feeding back the propeller pitch.

[0070] When installing the clamp coupling 5, the double-ended bolts and nuts 9, sizes one to twelve, on the clamp coupling 5 generally require a large elongation, making installation difficult. If the elongation is less than the design requirement, the double-ended bolts and nuts 9 will not be installed properly, which may result in the clamp coupling 5 failing to transmit the required torque, or misalignment of the shaft sections at both ends, causing instability in the pitch feedback function.

[0071] Currently, the existing technical solution for installing the clamp coupling 5 is to use a ruler to align shaft section 1 and shaft section 2, then install the left clamp coupling 51 and the right clamp coupling 52 on the outside of shaft section 1 and shaft section 2, and then use a hoist and a tightening wrench to apply torque to the first to twelfth double-ended bolts and nuts 9 on the clamp coupling 5 in sequence, so that the elongation of the first to twelfth double-ended bolts and nuts 9 reaches the design requirements.

[0072] According to the existing technical solution, installing the clamp coupling 5 first requires measuring the opening offset between shaft segment 1 and shaft segment 2. Based on this offset, the relative positions of shaft segment 1 and shaft segment 2 are adjusted. This process of measuring and adjusting the opening offset is repeated multiple times. Multiple manual measurements are cumbersome and may introduce significant errors, making shaft segment alignment difficult in the existing technology. Furthermore, the installation of the bolts 9 (numbers 1 to 12) on the clamp coupling 5 is complex, making it difficult to ensure that all bolts 9 achieve the required elongation. It is easy for some individual bolts 9 to reach the required elongation, while others are less than the standard. In such cases, the bolts 9 with the larger elongation need to be loosened for adjustment, resulting in repeated installation. Therefore, in the existing technology, achieving the required elongation of the bolts 9 (numbers 1 to 12) is difficult.

[0073] The application can well solve the difficult problem of centering operation of the first shaft segment 1 and the second shaft segment 2 by tightly attaching the centering tool 3 to the first shaft segment 1 and the second shaft segment 2 and then adjusting the relative position of the first shaft segment 1 and the second shaft segment 2 according to the measured difference value of the first dial gauge 323 and the second dial gauge 324; the feedback bracket 4 is fixed by using the first supporting point 44, the second supporting point 45, the third supporting point 46 and the fourth supporting point 47, thereby avoiding the installation out-of-position problem of the feedback bracket 4 and the push-pull rod 6 and the feedback bracket 4 and the piston rod 7 and avoiding the problem of small gap between the feedback bracket 4 and the feedback groove 53; the observation hole 43 is used to observe the relative position of the push-pull rod 6 and the piston rod 7 and the feedback bracket during installation, thereby further ensuring good installation effect; the first to twelfth double-headed bolts and nuts 9 are tightened in sequence, and the length and width values of the upper gap 54 and the lower gap 55 are measured by using the feeler gauge during the tightening process, so that the originally repeated bolt loosening and tightening process can be greatly simplified, the elongation of the first to twelfth double-headed bolts 9 reaches the design standard, and the installation efficiency of the first to twelfth double-headed bolts 9 is greatly improved; when the turning process is performed, the gasket 49 is used to adjust the end face run-out of the feedback ring 48, so that the run-out meets the requirement of being less than or equal to 0.10 millimeter.

[0074] Embodiment 1

[0075] Please see Figure 1 — Figure 10 A method for installing a double-shell coupling, the method comprising the following steps:

[0076] First step: first, place the first shaft segment 1 and the second shaft segment 2 apart from each other in a centered manner, then tightly attach the lower surface of the semicircular end 31 of the centering tool 3 to the upper surface of the first shaft segment 1, then place the platform end 32 of the centering tool 3 above the upper surface of the second shaft segment 2, then insert the first dial gauge 323 into the middle measuring hole 321 of the platform end 32, then insert the second dial gauge 324 into the far measuring hole 322 of the platform end 32, then read the reading of the first dial gauge 323 and the reading of the second dial gauge 324, then calculate the difference value of the readings, if the difference value does not meet the requirement, adjust the position of the first shaft segment 1 and the second shaft segment 2 until the difference value meets the requirement, then rotate the centering tool 3 to the side edge of the first shaft segment 1, then read the reading of the first dial gauge 323 and the reading of the second dial gauge 324, then calculate the difference value of the readings, if the difference value does not meet the requirement, adjust the position of the first shaft segment 1 and the second shaft segment 2 until the difference value meets the requirement, and the first step is ended;

[0077] Second step: first install the feedback bracket 4 in the feedback groove 53 of the left clamping shell coupling 51, then fix the feedback bracket 4, then connect and fix the push-pull rod 6 with one end of the left clamping shell coupling 51, then connect and fix the piston rod 7 with the other end of the left clamping shell coupling 51, then check whether the push-pull rod 6 and the piston rod 7 are close to the left clamping shell coupling 51 through the observation hole 43, then check whether the push-pull rod 6 and the piston rod 7 are in the middle position of the feedback groove 53, if not, adjust the position of the push-pull rod 6 and the piston rod 7, end the second step;

[0078] Third step: first align the right connecting end 521 of the right clamping shell coupling 52 with the left connecting end 511 of the left clamping shell coupling 51, then connect the right clamping shell coupling 52 with the left clamping shell coupling 51 by using the first to twelfth double-headed bolts and nuts 9 one by one, the assembly method of each double-headed bolt and nut 10 is that first insert the double-headed bolt 101 into the right clamping shell coupling 52 and the left clamping shell coupling 51, then screw the nut 102 on both ends of the double-headed bolt 101; then measure the width value of the upper gap 54 between the right connecting end 521 and the left connecting end 511, then compare whether the width values of the upper gap 54 and the lower gap 55 are equal, if not, loosen the nuts 102 one by one, then adjust the position of the right clamping shell coupling 52, make the right clamping shell coupling 52 move towards the direction of the larger gap value, until the width values of the upper gap 54 and the lower gap 55 are equal; then measure the length values of the upper gap 54 and the lower gap 55, then compare whether the length values of the upper gap 54 and the lower gap 55 are equal, if not, adjust the position of the right clamping shell coupling 52 and the left clamping shell coupling 51, until the length values of the upper gap 54 and the lower gap 55 are equal; then tighten the first to twelfth double-headed bolts and nuts 9 according to the foregoing order by using smaller torque, then measure the width values of the upper gap 54 and the lower gap 55, adjust the position of the right clamping shell coupling 52 and the left clamping shell coupling 51 to make the width values of the upper gap 54 and the lower gap 55 equal, then measure the length value of the upper gap 54, adjust the position of the right clamping shell coupling 52 and the left clamping shell coupling 51 to make the length values of the upper gap 54 and the lower gap 55 equal, then increase the torque, tighten the first to twelfth double-headed bolts and nuts 9 again according to the foregoing order, then check the length and width values of the upper gap 54 and the lower gap 55, then adjust the position of the right clamping shell coupling 52 and the left clamping shell coupling 51 to make the width values of the upper gap 54 and the lower gap 55 equal, and also make the length values of the upper gap 54 and the lower gap 55 equal; then gradually increase the torque and tighten for multiple rounds according to the foregoing order, until the first to twelfth double-headed bolts and nuts 9 reach the set elongation, end the third step;

[0079] Fourth step: first, the first and second shaft segment 1 segment 2 discarding process, and then use the third dial gauge 8 check the feedback ring 48 end face runout, if the runout does not meet the requirements, between the feedback ring 48 and feedback bracket 4 adjustment, until the feedback ring 48 end face runout meet the requirements, end fourth step.

[0080] Example 2:

[0081] The basic content is the same as example 1, the difference is:

[0082] Please see Figure 8 — Figure 9 , the third step, the first to the twelfth double headed bolt nut 9 gradually on the right and left clamping shell coupling 52 coupling 51 for the connection of the order: the first double headed bolt nut 91- the second double headed bolt nut 92- the third double headed bolt nut 93- the fourth double headed bolt nut 94- the fifth double headed bolt nut 95- the sixth double headed bolt nut 96- the seventh double headed bolt nut 97- the eighth double headed bolt nut 98- the ninth double headed bolt nut 99- the tenth double headed bolt nut 910- the eleventh double headed bolt nut 911- the twelfth double headed bolt nut 912.

[0083] The third step, the first to the twelfth double headed bolt nut 9 gradually on the right and left clamping shell coupling 52 coupling 51 for the connection of the order: the first double headed bolt nut 91- the second double headed bolt nut 92- the third double headed bolt nut 93- the fourth double headed bolt nut 94- the ninth double headed bolt nut 99- the tenth double headed bolt nut 910- the eleventh double headed bolt nut 911- the twelfth double headed bolt nut 912- the fifth double headed bolt nut 95- the sixth double headed bolt nut 96- the seventh double headed bolt nut 97- the eighth double headed bolt nut 98.

[0084] The third step, the first to the twelfth double headed bolt nut 9 gradually on the right and left clamping shell coupling 52 coupling 51 for the connection of the order: the fifth double headed bolt nut 95- the sixth double headed bolt nut 96- the seventh double headed bolt nut 97- the eighth double headed bolt nut 98- the first double headed bolt nut 91- the second double headed bolt nut 92- the third double headed bolt nut 93- the fourth double headed bolt nut 94- the ninth double headed bolt nut 99- the tenth double headed bolt nut 910- the eleventh double headed bolt nut 911- the twelfth double headed bolt nut 912.

[0085] In the third step, the first to the twelfth double-headed bolt nuts 9 are connected to the right clamping shell coupling 52 and the left clamping shell coupling 51 in the following order: the ninth double-headed bolt nut 99, the tenth double-headed bolt nut 910, the eleventh double-headed bolt nut 911, the twelfth double-headed bolt nut 912, the first double-headed bolt nut 91, the second double-headed bolt nut 92, the third double-headed bolt nut 93, the fourth double-headed bolt nut 94, the fifth double-headed bolt nut 95, the sixth double-headed bolt nut 96, the seventh double-headed bolt nut 97, and the eighth double-headed bolt nut 98.

[0086] In the third step, the first to the twelfth double-headed bolt nuts 9 are connected to the right clamping shell coupling 52 and the left clamping shell coupling 51 in the following order: the ninth double-headed bolt nut 99, the tenth double-headed bolt nut 910, the eleventh double-headed bolt nut 911, the twelfth double-headed bolt nut 912, the first double-headed bolt nut 91, the second double-headed bolt nut 92, the third double-headed bolt nut 93, the fourth double-headed bolt nut 94, the fifth double-headed bolt nut 95, the sixth double-headed bolt nut 96, the seventh double-headed bolt nut 97, and the eighth double-headed bolt nut 98.

[0087] In the third step, the first to the twelfth double-headed bolt nuts 9 are connected to the right clamping shell coupling 52 and the left clamping shell coupling 51 in the following order: the ninth double-headed bolt nut 99, the tenth double-headed bolt nut 910, the eleventh double-headed bolt nut 911, the twelfth double-headed bolt nut 912, the fifth double-headed bolt nut 95, the sixth double-headed bolt nut 96, the seventh double-headed bolt nut 97, the eighth double-headed bolt nut 98, the first double-headed bolt nut 91, the second double-headed bolt nut 92, the third double-headed bolt nut 93, and the fourth double-headed bolt nut 94.

[0088] In use, first, the left connecting end 511 of the left clamping shell coupling 51 is aligned with the right connecting end 521 of the right clamping shell coupling 52, and then the first to the twelfth double-headed bolt nuts 9 are connected to the right clamping shell coupling 52 and the left clamping shell coupling 51 in any of the above orders. In the connection, every four continuously tightened single double-headed bolt nuts 10 form a small group, and the first to the twelfth double-headed bolt nuts 9 are divided into three groups, and the installation order of the three groups can be exchanged. In the small group, the front double-headed bolt 101 and the rear double-headed bolt 101 are symmetrical along the axial direction, the radial direction, or the center point of the clamping shell coupling 5, so as to facilitate the stress of the double-headed bolt 101, that is, when the double-headed bolt 101 is tightened, the stability of the clamping shell coupling 5 can be maintained, and the elongation of the first to the twelfth double-headed bolt nuts 9 can reach the design requirement.

[0089] Example 3:

[0090] The basic content is the same as that of Example 1, except that

[0091] Please refer to Figure 9 , the right shell coupling 52 and the left shell coupling 51 are mirror image symmetrical; the right shell coupling 52 includes a first nut groove 56, a second nut groove 57, a third nut groove 58 and a fourth nut groove 59; the first nut groove 56 and the second nut groove 57 are radially symmetrical along the right shell coupling 52, the third nut groove 58 and the fourth nut groove 59 are radially symmetrical along the right shell coupling 52, and the first nut groove 56 and the third nut groove 58 are axially symmetrical along the right shell coupling 52; the first nut groove 56 includes a ninth double-headed bolt nut 99, a second double-headed bolt nut 92 and an eighth double-headed bolt nut 98, the ninth double-headed bolt nut 99 is located at a position close to the outside of the right shell coupling 52 in the first nut groove 56, the eighth double-headed bolt nut 98 is located at a position close to the inside of the right shell coupling 52 in the first nut groove 56, and the second double-headed bolt nut 92 is located between the ninth double-headed bolt nut 99 and the eighth double-headed bolt nut 98; the second nut groove 57 includes a fifth double-headed bolt nut 95, a fourth double-headed bolt nut 94 and a twelfth double-headed bolt nut 912, the twelfth double-headed bolt nut 912 is located at a position close to the outside of the right shell coupling 52 in the second nut groove 57, the fifth double-headed bolt nut 95 is located at a position close to the inside of the right shell coupling 52 in the second nut groove 57, and the fourth double-headed bolt nut 94 is located between the fifth double-headed bolt nut 95 and the twelfth double-headed bolt nut 912; the third nut groove 58 includes a tenth double-headed bolt nut 910, a first double-headed bolt nut 91 and a seventh double-headed bolt nut 97, the tenth double-headed bolt nut 910 is located at a position close to the outside of the right shell coupling 52 in the third nut groove 58, the seventh double-headed bolt nut 97 is located at a position close to the inside of the right shell coupling 52 in the third nut groove 58, and the first double-headed bolt nut 91 is located between the tenth double-headed bolt nut 910 and the seventh double-headed bolt nut 97; the fourth nut groove 59 includes a sixth double-headed bolt nut 96, a third double-headed bolt nut 93 and an eleventh double-headed bolt nut 911, the eleventh double-headed bolt nut 911 is located at a position close to the outside of the right shell coupling 52 in the fourth nut groove 59, the sixth double-headed bolt nut 96 is located at a position close to the inside of the right shell coupling 52 in the fourth nut groove 59, and the third double-headed bolt nut 93 is located between the sixth double-headed bolt nut 96 and the eleventh double-headed bolt nut 911.

[0092] In use, first, the left connecting end 511 is aligned with the right connecting end 521, then the left clamping shell coupling 51 and the right clamping shell coupling 52 are connected one by one using the double-headed bolt nut 9, the first nut groove 56 and the second nut groove 57 are radially symmetrical along the right clamping shell coupling 52, the third nut groove 58 and the fourth nut groove 59 are radially symmetrical along the right clamping shell coupling 52, the first nut groove 56 and the third nut groove 58 are axially symmetrical along the right clamping shell coupling 52, and the second nut groove 57 and the fourth nut groove 59 are axially symmetrical along the right clamping shell coupling 52, so that the clamping shell coupling 5 is locked from the outside of the upper and lower parts of the two shaft sections, has a good shaft section connection effect, and the first nut groove 56, the second nut groove 57, the third nut groove 58, and the fourth nut groove 59 each have three single double-headed bolt nuts 10, which ensures the stability of the locking.

[0093] Embodiment 4:

[0094] The basic content is the same as that in Embodiment 1, except that:

[0095] Please refer to Figure 6 — Figure 7 The first supporting point 44 is at the upper end of the feedback support 4, the second supporting point 45 is at the lower end of the feedback support 4, the third supporting point 46 is at the right side of the upper end of the feedback support 4, and the fourth supporting point 47 is at the right side of the lower end of the feedback support 4.

[0096] In use, the feedback support 4 is fixed using a jack at the first supporting point 44, the second supporting point 45, the third supporting point 46, and the fourth supporting point 47, the push-pull rod 6 is rotationally connected to the left port 41 of the feedback support 4, and the piston rod 7 is rotationally connected to the right port 42 of the feedback support, so that the feedback support 4 is fixed in the rotation direction of the push-pull rod 6 and the piston rod 7, and thus the feedback support 4 does not rotate with the push-pull rod 6 and the piston rod 7, which avoids the change of the position of the feedback support 4, and thus improves the installation precision.

[0097] Embodiment 5:

[0098] The basic content is the same as that in Embodiment 1, except that:

[0099] Please refer to Figure 2 — Figure 4 The method comprises a centering tool 3, the centering tool comprises a semicircular end 31 and a platform end 32, the semicircular end 31 is connected to the platform end 32, the platform end 32 comprises a middle measuring hole 321 and a remote measuring hole 322, the remote measuring hole 322 extends away from the middle measuring hole 321 in the direction away from the semicircular end 31, the middle measuring hole 321 is a through hole penetrating through the platform end 32, and the remote measuring hole 322 is a through hole penetrating through the platform end 32.

[0100] Preferably, the distance between the middle measuring hole 321 and the far measuring hole 322 is 0.5-0.75 times of the shaft diameter of the shaft section.

[0101] In use, the lower surface of the semicircular end 31 is first tightly attached to the upper surface of the first shaft section 1, then the platform end 32 is placed on the upper surface of the second shaft section 2, then the first dial gauge 323 is inserted into the middle measuring hole 321, the lower surface of the first dial gauge 323 is in contact with the upper surface of the second shaft section 2, then the second dial gauge 324 is inserted into the far measuring hole 322, the lower surface of the second dial gauge 324 is in contact with the upper surface of the second shaft section 2, then the readings of the first dial gauge 323 and the second dial gauge 324 are read respectively, the difference between the two readings is calculated, which is the position difference between the first shaft section 1 and the second shaft section 2 in the vertical direction, the position of the first shaft section 1 or the second shaft section 2 is adjusted according to the position difference, until the position difference is less than 0.05mm, then the centering tool 3 is rotated by 90 degrees to the right or to the left, the centering tool 3 reaches the side surface of the first shaft section 1, then the readings of the first dial gauge 323 and the second dial gauge 324 are read respectively, the difference between the two readings is calculated, which is the position difference between the first shaft section 1 and the second shaft section 2 in the horizontal direction, the position of the first shaft section 1 or the second shaft section 2 is adjusted according to the position difference, until the position difference is less than 0.05mm, which completes the centering of the first shaft section 1 and the second shaft section 2.

[0102] The above description is only the preferred embodiment of the present application, the protection scope of the present application is not limited to the above embodiment, any equivalent modification or change according to the disclosed content by the person skilled in the art should be included in the protection scope recorded in the claims.

Claims

1. A method for installing a double-shell coupling, the method comprising the following steps: Step 1: first, place a first shaft segment (1) and a second shaft segment (2) in a spaced-apart and centered manner, then tightly attach a lower surface of a semicircular end (31) of a centering tool (3) to an upper surface of the first shaft segment (1), place a platform end (32) of the centering tool (3) above an upper surface of the second shaft segment (2), then insert a first dial gauge (323) into a middle measuring hole (321) of the platform end (32), insert a second dial gauge (324) into a distal measuring hole (322) of the platform end (32), then read a reading of the first dial gauge (323) and a reading of the second dial gauge (324), and calculate a difference between the readings; if the difference does not meet a requirement, adjust positions of the first shaft segment (1) and the second shaft segment (2) until the difference meets the requirement; then rotate the centering tool (3) to a side of the first shaft segment (1), read the reading of the first dial gauge (323) and the reading of the second dial gauge (324), and calculate a difference between the readings; if the difference does not meet the requirement, adjust the positions of the first shaft segment (1) and the second shaft segment (2) until the difference meets the requirement, and end the first step; Step 2: first, install a feedback bracket (4) in a feedback groove (53) of a left double-shell coupling (51), then fix the feedback bracket (4), then connect and fix a push-pull rod (6) to one end of the left double-shell coupling (51), then connect and fix a piston rod (7) to the other end of the left double-shell coupling (51), then check, through an observation hole (43), whether the push-pull rod (6) and the piston rod (7) are tightly attached to the left double-shell coupling (51), then check whether the push-pull rod (6) and the piston rod (7) are in a middle position in the feedback groove (53); if the above requirements are not met, adjust positions of the push-pull rod (6) and the piston rod (7), and end the second step. Third step: first, align the right connecting end (521) of the right clamping shell coupling (52) with the left connecting end (511) of the left clamping shell coupling (51), then connect the right clamping shell coupling (52) and the left clamping shell coupling (51) one by one using the first to twelfth double-headed bolts and nuts (9), the assembly method of each double-headed bolt and nut (10) is to first insert the double-headed bolt (101) through the right clamping shell coupling (52) and the left clamping shell coupling (51), then screw the nut (102) on both ends of the double-headed bolt (101); then measure the width value of the upper gap (54) between the right connecting end (521) and the left connecting end (511), then compare whether the width values of the upper gap (54) and the lower gap (55) are equal, if the values are not equal, loosen the nuts (102) one by one, then adjust the position of the right clamping shell coupling (52), move the right clamping shell coupling (52) towards the direction with larger gap value, until the width values of the upper gap (54) and the lower gap (55) are equal; then measure the length values of the upper gap (54) and the lower gap (55), and compare whether the length values of the upper gap (54) and the lower gap (55) are equal, if the length values are not equal, adjust the position of the right clamping shell coupling (52) and the left clamping shell coupling (51), until the length values of the upper gap (54) and the lower gap (55) are equal; then use smaller torque to tighten the first to twelfth double-headed bolts and nuts (9) in the order of the previous connection of the right clamping shell coupling (52) and the left clamping shell coupling (51), then measure the width values of the upper gap (54) and the lower gap (55), adjust the position of the right clamping shell coupling (52) and the left clamping shell coupling (51) to make the width values of the upper gap (54) and the lower gap (55) equal, then measure the length value of the upper gap (54), adjust the position of the right clamping shell coupling (52) and the left clamping shell coupling (51) to make the length values of the upper gap (54) and the lower gap (55) equal, then increase the torque, tighten the first to twelfth double-headed bolts and nuts (9) again in the previous order, then check the length and width values of the upper gap (54) and the lower gap (55), then adjust the position of the right clamping shell coupling (52) and the left clamping shell coupling (51) to make the width values of the upper gap (54) and the lower gap (55) equal, and also make the length values of the upper gap (54) and the lower gap (55) equal; gradually increase the torque and tighten in the previous order for multiple rounds until the first to twelfth double-headed bolts and nuts (9) reach the set elongation, ending the third step; Fourth step: first, perform the jiggering process on the first shaft segment (1) and the second shaft segment (2), then use the third dial gauge (8) to check the end face runout of the feedback ring (48), if the runout does not meet the requirements, adjust between the feedback ring (48) and the feedback bracket (4) until the end face runout of the feedback ring (48) meets the requirements, ending the fourth step.

2. The method of installing a double-shielded coupling as defined in claim 1, wherein: The third step, the first to the twelfth double head bolt nut (9) one by one to the right and left clamping shell coupling (52) (51) for connecting the order: No. 1 double head bolt nut (91) - No. 2 double head bolt nut (92) - No. 3 double head bolt nut (93) - No. 4 double head bolt nut (94) - No. 5 double head bolt nut (95) - No. 6 double head bolt nut (96) - No. 7 double head bolt nut (97) - No. 8 double head bolt nut (98) - No. 9 double head bolt nut (99) - No. 10 double head bolt nut (910) - No. 11 double head bolt nut (911) - No. 12 double head bolt nut (912).

3. The method of installing a double-shielded coupling as defined in claim 1, wherein: The third step, the first to the twelfth double head bolt nut (9) one by one to the right and left clamping shell coupling (52) (51) for connecting the order: No. 1 double head bolt nut (91) - No. 2 double head bolt nut (92) - No. 3 double head bolt nut (93) - No. 4 double head bolt nut (94) - No. 9 double head bolt nut (99) - No. 10 double head bolt nut (910) - No. 11 double head bolt nut (911) - No. 12 double head bolt nut (912) - No. 5 double head bolt nut (95) - No. 6 double head bolt nut (96) - No. 7 double head bolt nut (97) - No. 8 double head bolt nut (98).

4. The method of installing a double-shielded coupling as defined in claim 1, wherein: The third step, the first to the twelfth double head bolt nut (9) one by one to the right and left clamping shell coupling (52) (51) for connecting the order: No. 5 double head bolt nut (95) - No. 6 double head bolt nut (96) - No. 7 double head bolt nut (97) - No. 8 double head bolt nut (98) - No. 1 double head bolt nut (91) - No. 2 double head bolt nut (92) - No. 3 double head bolt nut (93) - No. 4 double head bolt nut (94) - No. 9 double head bolt nut (99) - No. 10 double head bolt nut (910) - No. 11 double head bolt nut (911) - No. 12 double head bolt nut (912).

5. The method of installing a double-shielded coupling as defined in claim 1, wherein: The third step, the first to the twelfth double head bolt nut (9) one by one to the right and left clamping shell coupling (52) (51) for connecting the order: No. 5 double head bolt nut (95) - No. 6 double head bolt nut (96) - No. 7 double head bolt nut (97) - No. 8 double head bolt nut (98) - No. 9 double head bolt nut (99) - No. 10 double head bolt nut (910) - No. 11 double head bolt nut (911) - No. 12 double head bolt nut (912) - No. 1 double head bolt nut (91) - No. 2 double head bolt nut (92) - No. 3 double head bolt nut (93) - No. 4 double head bolt nut (94).

6. The method of installing a double-shielded coupling as defined in claim 1, wherein: In the third step, the first to twelfth double head bolt nuts (9) are connected to the right and left clamping shell couplings (52, 51) in the following order: No. 9 double head bolt nut (99), No. 10 double head bolt nut (910), No. 11 double head bolt nut (911), No. 12 double head bolt nut (912), No. 1 double head bolt nut (91), No. 2 double head bolt nut (92), No. 3 double head bolt nut (93), No. 4 double head bolt nut (94), No. 5 double head bolt nut (95), No. 6 double head bolt nut (96), No. 7 double head bolt nut (97), and No. 8 double head bolt nut (98).

7. The method of installing a double-shielded coupling as defined in claim 1, wherein: In the third step, the first to twelfth double head bolt nuts (9) are connected to the right and left clamping shell couplings (52, 51) in the following order: No. 9 double head bolt nut (99), No. 10 double head bolt nut (910), No. 11 double head bolt nut (911), No. 12 double head bolt nut (912), No. 5 double head bolt nut (95), No. 6 double head bolt nut (96), No. 7 double head bolt nut (97), No. 8 double head bolt nut (98), No. 1 double head bolt nut (91), No. 2 double head bolt nut (92), No. 3 double head bolt nut (93), and No. 4 double head bolt nut (94).

8. The method of installing a double-shielded coupling as defined in claim 1, wherein: The right clamping shell coupling (52) and the left clamping shell coupling (51) are mirror-symmetrically structured; The right clamping shell coupling (52) comprises a first nut groove (56), a second nut groove (57), a third nut groove (58), and a fourth nut groove (59); The first nut groove (56) and the second nut groove (57) are radially symmetric along the right clamping shell coupling (52), the third nut groove (58) and the fourth nut groove (59) are radially symmetric along the right clamping shell coupling (52), and the first nut groove (56) and the third nut groove (58) are axially symmetric along the right clamping shell coupling (52); The first nut groove (56) comprises a No. 9 double head bolt nut (99), a No. 2 double head bolt nut (92), and a No. 8 double head bolt nut (98), the No. 9 double head bolt nut (99) is located at a position close to the outside of the right clamping shell coupling (52) in the first nut groove (56), the No. 8 double head bolt nut (98) is located at a position close to the inside of the right clamping shell coupling (52) in the first nut groove (56), and the No. 2 double head bolt nut (92) is located between the No. 9 double head bolt nut (99) and the No. 8 double head bolt nut (98). The No. 2 nut groove (57) includes No. 5 double-headed bolt nut (95), No. 4 double-headed bolt nut (94) and No. 12 double-headed bolt nut (912), the No. 12 double-headed bolt nut (912) is located in the No. 2 nut groove (57) near the right clamping shell coupling (52) outside the part, the No. 5 double-headed bolt nut (95) is located in the No. 2 nut groove (57) near the right clamping shell coupling (52) inside the part, the No. 4 double-headed bolt nut (94) is located between the No. 5 double-headed bolt nut (95) and the No. 12 double-headed bolt nut (912); The No. 3 nut groove (58) includes No. 10 double-headed bolt nut (910), No. 1 double-headed bolt nut (91) and No. 7 double-headed bolt nut (97), the No. 10 double-headed bolt nut (910) is located in the No. 3 nut groove (58) near the right clamping shell coupling (52) outside the part, the No. 7 double-headed bolt nut (97) is located in the No. 3 nut groove (58) near the right clamping shell coupling (52) inside the part, the No. 1 double-headed bolt nut (91) is located between the No. 10 double-headed bolt nut (910) and the No. 7 double-headed bolt nut (97); The No. 4 nut groove (59) includes No. 6 double-headed bolt nut (96), No. 3 double-headed bolt nut (93) and No. 11 double-headed bolt nut (911), the No. 11 double-headed bolt nut (911) is located in the No. 4 nut groove (59) near the right clamping shell coupling (52) outside the part, the No. 6 double-headed bolt nut (96) is located in the No. 4 nut groove (59) near the right clamping shell coupling (52) inside the part, the No. 3 double-headed bolt nut (93) is located between the No. 6 double-headed bolt nut (96) and the No. 11 double-headed bolt nut (911).

9. The method of installing a double-shielded coupling as defined in claim 1, wherein: The No. 1 support point (44) is at the upper end of the feedback support (4); the No. 2 support point (45) is at the lower end of the feedback support (4); the No. 3 support point (46) is at the right side of the upper end of the feedback support (4); the No. 4 support point (47) is at the right side of the lower end of the feedback support (4); The No. 1 support point (44), the No. 2 support point (45), the No. 3 support point (46) and the No. 4 support point (47) are used to fix the feedback support (4) by using a jack.

10. The method of installing a double-shielded coupling as defined in claim 1, wherein: The method includes a centering tool (3), the centering tool includes a semicircular end (31) and a platform end (32), the semicircular end (31) is connected with the platform end (32), the platform end (32) includes a middle measuring hole (321) and a far measuring hole (322), the far measuring hole (322) extends in the direction away from the semicircular end (31) of the middle measuring hole (321); The middle measuring hole (321) is a through hole penetrating the platform end (32), and the far measuring hole (322) is a through hole penetrating the platform end (32).

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