A piston body and piston rod assembly detection coaxiality device and assembly detection method

Abstract

The invention relates to the technical field of piston assembly, and specifically to a device for detecting the coaxiality of a piston body and a piston rod assembly. The device can conveniently assemble the piston body and the piston rod, and can perform coaxiality detection, thereby ensuring the quality after assembly and improving the service life. The device comprises a left support and a right support. Both the left support and the right support are provided with adjustable support frames, and a liftable V-shaped block is arranged on the adjustable support frame. An instrument support is arranged on the left side of the left support, and a piston body dial indicator for measuring the outer circular runout of the piston body is installed on the instrument support. A mounting support is arranged on the right side of the right support, and a mounting support with a threaded ring is installed on the mounting support. A piston rod dial indicator for measuring the outer circular runout of the piston rod is installed on the right support. Two piston dial indicators arranged at intervals are installed on the instrument support. A guide groove is provided on the adjustable support frame, and a slider at the bottom of the V-shaped block is clamped in the guide groove and connected to a lifting mechanism. At the same time, the invention also provides a method for detecting the assembly of a piston body and a piston rod.

Description

Technical Field

[0001] The invention relates to the technical field of piston assembly, in particular to a device for detecting the coaxiality of a piston body and a piston rod and an assembly detection method. Background Art

[0002] In general, after the piston body is put on the piston rod and the locking nut is tightened, the entire component will be directly installed in the cylinder body assembly and connected to the crosshead. However, depending on the operating conditions of the compressor, the piston body structure has both single-stage and multi-stage splicing types; the locking nut is also divided into ordinary hexagonal nut, hydraulic nut, and multi-stage push nut. Although the dimensional accuracy of each of the above parts can be guaranteed by machine tool processing, when the fitter manually assembles them together, the form and position tolerance values ​​of the piston components are uncertain. In particular, the coaxiality of the piston body and the piston rod, once its value exceeds the design allowable range, the life of the cylinder liner and piston ring will be seriously shortened at the least, and the piston rod may be broken at the worst. Summary of the invention

[0003] In order to solve the problem that the quality of existing piston components is unstable after assembly, which affects the later service life, the present invention provides a piston body and piston rod assembly detection coaxiality device, which can facilitate the assembly of the piston body and the piston rod, and can perform coaxiality detection to ensure the quality after assembly and improve the service life. At the same time, the present invention also provides a piston body and piston rod assembly detection method.

[0004] The technical solution is as follows: a device for assembling and detecting the coaxiality of a piston body and a piston rod, characterized in that it comprises a left support and a right support, the left support and the right support are both equipped with an adjustable support frame, the adjustable support frame is provided with a liftable V-shaped block, an instrument support is provided on the left side of the left support, a piston body dial indicator for measuring the outer circle runout of the piston body is installed on the instrument support, a mounting support is provided on the right side of the right support, a mounting support with a threaded ring is installed on the mounting support, and a piston rod percentage gauge for measuring the outer circle runout of the piston rod is installed on the right support. The instrument support is provided with two piston dial indicators arranged at intervals, the adjustable support frame is provided with a guide groove, the slider at the bottom of the V-shaped block is clamped in the guide groove and connected to the lifting mechanism, the lifting mechanism includes a screw rod and an adjusting nut, the upper end of the screw rod extends into the slider and is provided with a limiting head, and a matching limiting cavity is provided in the slider; below the guide groove, the adjustable support frame is provided with an adjusting groove, the lower end of the screw rod passes through the adjusting groove, and two adjusting nuts are installed on the screw rod and are respectively provided in the guide groove and the adjusting groove.

[0005] Its further feature is that a column is installed on the right support, a clamping cantilever is mounted on the column, and an upper clamping block for pressing the piston rod is arranged on the clamping cantilever;

[0006] The side surface of the slider is higher than the guide groove, and a pressing plate corresponding to the slider is installed on the side surface of the adjustable support frame through fastening bolts;

[0007] The mounting seat comprises a lower mounting seat and an upper mounting seat, the threaded ring comprises an upper threaded half ring and a lower threaded half ring, the upper mounting seat is connected to the lower mounting seat via a screw and a nut, and the threaded ring is connected to the mounting seat via a positioning pin;

[0008] A limiting plate for limiting the piston rod is also arranged on the mounting support.

[0009] A method for assembling and inspecting a piston body and a piston rod, characterized in that it comprises the following steps:

[0010] (1) Adjust the distance between the two adjustable support frames according to the length of the piston rod. Apply molybdenum disulfide on the fitting surface of the V-shaped block and place the piston rod on the V-shaped block.

[0011] (2) Adjust the clamping cantilever and apply molybdenum disulfide on its fitting surface so that it presses the tail end of the piston rod;

[0012] (3) Put the piston rod on the piston body and tighten it according to the technical requirements of the drawing;

[0013] (4) Select the corresponding thread ring according to the thread specification of the piston rod tail end, install it into the mounting seat, and apply molybdenum disulfide in the threaded hole;

[0014] (5) Adjust the height of the two adjustable support frames so that the piston rod can be slowly wound into the mounting seat along the thread at the tail end, and the entire piston component can be positioned based on the thread;

[0015] (6) Prepare two piston body dial indicators and one piston rod dial indicator. Place the two piston body dial indicators on the piston body seat side and cover side respectively, and place the piston rod dial indicator in the middle of the piston rod.

[0016] (7) Rotate the piston rod in a full circle and record the runout values ​​of each dial indicator. If it exceeds the permitted range of the technical requirements of the drawing, the piston body needs to be reinstalled;

[0017] (8) Remove the upper mounting seat, loosen the clamping cantilever, and move the piston component out of the device as a qualified part to be assembled.

[0018] After adopting the present invention, the piston rod is supported by an adjustable support frame, and then the piston body is assembled, and finally the piston body dial indicator and the piston rod dial indicator are used to detect the coaxiality, which is simple and convenient to operate. After assembly, the coaxiality detection can ensure the quality of the piston component and increase the service life; further, only the threaded ring in the mounting seat needs to be replaced to be applicable to the assembly detection of piston components of different models, and the device has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of the structure of the present invention;

[0020] Figure 2 It is a side view of the adjustable support frame;

[0021] Figure 3 for Figure 2 Side view of

[0022] Figure 4 The figure shows the side view of the mounting base. DETAILED DESCRIPTION

[0023] See Figures 1 to 4 As shown, a device for assembling and detecting the coaxiality of a piston body and a piston rod comprises a left support 1 and a right support 2. An adjustable support frame 3 is installed on both the left support 1 and the right support 2. A liftable V-shaped block 4 is arranged on the adjustable support frame 3. An instrument support 5 is arranged on the left side of the left support 1. Two piston body dial indicators 7 for measuring the outer circle runout of a piston body 6 are installed on the instrument support 5, which correspond to the seat side and the cover side of the piston body 6 respectively. A mounting support 8 is arranged on the right side of the right support 2. A mounting support 9 with a threaded ring is installed on the mounting support 8. A piston rod dial indicator 11 for measuring the outer circle runout of a piston rod 10 is installed on the right support 2.

[0024] A guide groove 12 is provided on the adjustable support frame 3, and a slider 13 at the bottom of the V-shaped block 4 is clamped in the guide groove 12 and connected to the lifting mechanism. The lifting mechanism includes a screw rod 14 and an adjusting nut 15. The upper end of the screw rod 14 extends into the slider 13 and is provided with a limiting head 16. A matching limiting cavity 17 is provided in the slider 13; located below the guide groove 12, an adjusting groove 18 is provided on the adjustable support frame 3, and the lower end of the screw rod 14 passes through the adjusting groove 18. Two adjusting nuts 15 are installed on the screw rod 14 and are respectively arranged in the guide groove 12 and the adjusting groove 18, and are attached to the bottom of the guide groove 12 and the top of the adjusting groove 18; during adjustment, since the limiting head 16 is limited in the limiting cavity 17, when one of the adjusting nuts 15 is rotated, the lifting and lowering of the screw rod 14 can be realized, thereby driving the slider 13 and the V-shaped block 4 to lift and lower, and completing the adjustment of the piston rod 10.

[0025] A column 20 is installed on the right support 2, and a clamping cantilever 21 is sleeved on the column 20. An upper pressing block 22 of the clamping cantilever 21 presses the piston rod 10, and a V-shaped fitting surface is provided on the upper pressing block 22.

[0026] The side surface of the slider 13 is higher than the guide groove 12 , and a clamping plate 23 corresponding to the slider 13 is installed on the side surface of the adjustable support frame 3 through a fastening bolt 24 , so as to fix the slider 13 .

[0027] The mounting seat 9 includes a lower mounting seat 25 and an upper mounting seat 26, and the threaded ring includes an upper threaded half ring 27 and a lower threaded half ring 28. The upper mounting seat 26 is connected to the lower mounting seat 25 through a screw 29 and a nut 30, and the threaded ring is connected to the mounting seat 9 through a positioning pin 31. They are all split up and down for easy removal and replacement. The limit plate 32 has a steel ball 33 that matches the center hole at the rear end of the piston rod 10 to prevent the rear end thread of the piston rod 10 from detaching from the mounting seat 9.

[0028] In the present invention, the left support 1, the right support 2, the instrument support 5, and the mounting support 8 are all installed with a slide rail 19 at the bottom.

[0029] A method for assembling and inspecting a piston body and a piston rod comprises the following steps:

[0030] (1) The distance between the two adjustable support frames 3 is adjusted according to the length of the piston rod 10. After molybdenum disulfide is applied to the fitting surface of the V-shaped block 4, the piston rod 10 is placed on the V-shaped block 4;

[0031] (2) Adjust the clamping cantilever 21 and apply molybdenum disulfide on its contact surface so that it presses the rear end of the piston rod 10;

[0032] (3) Put the piston body 6 onto the piston rod 10 and tighten it according to the technical requirements of the drawing;

[0033] (4) Select the corresponding thread ring according to the thread specification of the end of the piston rod 10, install it into the mounting seat 9, and apply molybdenum disulfide in the threaded hole;

[0034] (5) Adjust the heights of the two adjustable support frames 3 so that the piston rod 10 is slowly wound into the mounting seat 9 along the thread at the tail end, and the entire piston component is positioned based on the thread;

[0035] (6) Prepare two piston body dial gauges 7 and one piston rod dial gauge 11. The two piston body dial gauges 7 are placed at point B on the piston body seat side and point C on the cover side respectively. The piston rod dial gauge 11 is placed at point A in the middle of the piston rod 10.

[0036] (7) Rotate the piston rod 10 in a full circle and record the runout values ​​of each dial indicator. If the runout value exceeds the permitted range of the technical requirements of the drawing, the piston body 6 needs to be reinstalled;

[0037] (8) Remove the upper mounting seat 26, loosen the clamping cantilever 21, and move the piston component out of the device as a qualified part to be assembled.

Claims

1. A device for detecting the coaxiality of a piston body and a piston rod, characterized in that: It includes a left support and a right support, and the left support and the right support are both equipped with adjustable support frames, and the adjustable support frame is provided with a liftable V-shaped block, an instrument support is provided on the left side of the left support, and two piston body dial indicators arranged at intervals and used to measure the outer circle runout of the piston body are installed on the instrument support, a mounting support is provided on the right side of the right support, and a mounting seat with a threaded ring is installed on the mounting support, and a piston rod dial indicator for measuring the outer circle runout of the piston rod is installed on the right support, and a guide groove is provided on the adjustable support frame, and a slider at the bottom of the V-shaped block is clamped in the guide groove and connected to a lifting mechanism, and the lifting mechanism includes a screw and an adjusting nut, the upper end of the screw extends into the slider and is provided with a limiting head, and a matching limiting cavity is provided in the slider; located at Below the guide groove, an adjusting groove is opened on the adjustable support frame, the lower end of the screw rod passes through the adjusting groove, and two adjusting nuts are installed on the screw rod and are respectively arranged in the guide groove and the adjusting groove; a column is installed on the right support, and a clamping cantilever is mounted on the column, and an upper pressure block for pressing the piston rod is arranged on the clamping cantilever; the side of the slider is higher than the guide groove, and a clamping plate corresponding to the slider is installed on the side of the adjustable support frame through a fastening bolt; the mounting seat includes a lower mounting seat and an upper mounting seat, the threaded ring includes an upper threaded half ring and a lower threaded half ring, the upper mounting seat is connected to the lower mounting seat through a screw and a nut, and the threaded ring is connected to the mounting seat through a locating pin; a limit plate for limiting the piston rod is also arranged on the mounting support.

2. A method for detecting the assembly of a piston body and a piston rod, characterized in that: The detection is performed using the piston body and piston rod assembly coaxiality detection device as claimed in claim 1, comprising the following steps: (1) Adjust the distance between the two adjustable support frames according to the length of the piston rod. Apply molybdenum disulfide on the fitting surface of the V-shaped block and place the piston rod on the V-shaped block. (2) Adjust the clamping cantilever and apply molybdenum disulfide on its fitting surface so that it presses the tail end of the piston rod; (3) Put the piston rod on the piston body and tighten it according to the technical requirements of the drawing; (4) Select the corresponding thread ring according to the thread specification of the piston rod tail end, install it into the mounting seat, and apply molybdenum disulfide in the threaded hole; (5) Adjust the height of the two adjustable support frames so that the piston rod can be slowly wound into the mounting seat along the thread at the tail end, and the entire piston component can be positioned based on the thread; (6) Prepare two piston body dial indicators and one piston rod dial indicator. Place the two piston body dial indicators on the piston body seat side and cover side respectively, and place the piston rod dial indicator in the middle of the piston rod. (7) Rotate the piston rod in a full circle and record the runout values ​​of each dial indicator. If it exceeds the permitted range of the technical requirements of the drawing, the piston body needs to be reinstalled; (8) Remove the upper mounting seat, loosen the clamping cantilever, and move the piston component out of the device as a qualified part to be assembled.

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