WO2012126204A1

WO2012126204A1 - Axle-end nuts assembling system for crh2-type multiple units

Info

Publication number: WO2012126204A1
Application number: PCT/CN2011/075274
Authority: WO
Inventors: 崔巍; 边群星; 王斌; 许建良; 黄毅; 何世伟
Original assignee: 山东同力达智能机械有限公司
Priority date: 2011-03-21
Filing date: 2011-06-03
Publication date: 2012-09-27
Also published as: CN102152106B; CN102152106A

Abstract

An axle-end nuts assembling system for CRH2-type multiple units comprises a base (1) below steel rails, and an electrical controlled cabinet (13) on one side of the base. Screwing devices (2), first stop wheel devices (3), anti-back devices (4), jacking and lifting devices (5), clamping devices (6), and poking wheel devices (7) are symmetrically arranged on the base at both sides relative to the centerline of two steel rails. Frames (9) are symmetrically arranged on the base at both sides relative to the centerline of the two steel rails. A sliding rail above the frames (9) is sleeved with a fixation seat below the screwing device (2). The fixation seat is connected with a piston rod of a displacement cylinder (12), which is fixed on the frames (9). In the wheelset moving direction, the anti-back devices (4) are mounted below the steel rail, which is in front of the screwing devices (2). The first stop wheel devices (3) are provided below the steel rail, which is behind the screwing devices (2). Jacking and lifting devices (5), clamping devices (6), and poking wheel devices (7) are mounted below the steel rails corresponding to the position of the screwing devices (2). Second stop wheel devices (8) are symmetrically disposed below the steel rails relative to the centerline of the two steel rails, and in front of the anti-back devices (4) in the wheelset moving direction. The invention enables low labor intensity, thereby being able to accomplish the axle-end nuts assembling task for multiple units wheelset in an efficient manner.

Description

CRH2 type EMU shaft end nut assembly system Technical Field:

The present invention relates to a thread tightening assembly system, and more particularly to a CRH2 type EMU shaft end nut assembly system.

Background technique:

At present, the tightening machine is also widely used in related products such as locomotives, buses, automobiles and diesel engines. The emerging products of the motor car started late in China, but the development speed is quite rapid. According to the relevant technical specifications, the EMU runs over 1 million kilometers. It must be overhauled, and many EMU trains running on various lines have already approached or exceeded this number of kilometers. In order to ensure the daily operation of the EMUs on each line, all trains currently running must be sent to the base for overhaul. Four motor train maintenance bases in Beijing, Shanghai, Guangzhou and Wuhan have been established nationwide, and related supporting facilities have been gradually localized. However, there is no corresponding automatic equipment for the assembly and disassembly of the shaft end nuts of CRH2 EMUs.原始 and other original operations, labor intensity and tightening torque can not meet the requirements, seriously affecting the operational safety of the CRH2 EMU. Summary of the invention:

The invention provides a CRH2 type EMU shaft end nut assembly system, which has reasonable structure and convenient operation, greatly reduces the labor intensity of the operator, and can complete the CRH2 type EMU bogie wheel with high efficiency, high precision and high quality. The assembly work of the shaft end nut ensures the safe operation of the CRH2 type EMU and solves the problems in the prior art.

The technical solution adopted by the present invention to solve the above technical problems is as follows: It comprises a base disposed under two standard rails, and a screwing device, a first shifting mechanism, and a symmetrical arrangement are arranged on the bases on both sides of the center line of the two standard rails. Back mechanism, jacking mechanism, clamping mechanism and dial mechanism, two center rails on two standard rails The base of the side is symmetrically arranged with a frame, and the fixing seat of the lower part of the tightening device is set on two parallel sliding rails on the upper part of the frame, and the fixing seat is connected with the piston rod of the displacement cylinder fixed on the frame; a non-return mechanism is arranged below the rail in front of the tightening device, a first gear wheel mechanism is arranged below the rail behind the tightening device, and a jacking mechanism, a clamping mechanism and a dial mechanism are arranged below the rail opposite to the position of the tightening device; A second gear wheel mechanism symmetrically disposed on the center line of the two standard rails is disposed under the rail in front of the check mechanism along the direction of the wheel pair; and an electric control is provided on one side of the base.

Also included is a wheel set position detecting device, and the wheel set position detecting device is connected to the electronic control.

The wheel set position detecting device is a plurality of position sensing devices symmetrically disposed on the center line of the two standard rails for detecting the position of the wheel pair in the traveling, and the plurality of symmetric position sensing devices are respectively connected to the electronic control. .

Also included is a tightening device reset detecting device, and the tightening device reset detecting device is connected to the electronic control reject. The tightening device reset detecting device is two position sensing devices which are symmetrically arranged on the center frame of the two standard rails and are arranged on the rear frame of the lower fixing seat of the tightening device. The two position sensing devices are respectively connected with the electric air.

The first shifting wheel mechanism includes a first connecting seat and a second connecting seat which are fixedly arranged on the base and arranged in the traveling direction of the pair of wheels, and a swing arm is movably connected to the upper part of the second connecting seat, and the second arm is below the swing arm A first retaining wheel cylinder is movably connected to the connecting seat, and a front end of the piston rod of the first retaining wheel cylinder is respectively connected to one ends of the first connecting rod and the second connecting rod through a rotating shaft, and the other end of the first connecting rod is movably connected with the swing arm The other end of the second link is movably connected to the first connecting seat, and a buffer blocking device is fixed to the end of the swing arm connected to the first connecting end.

The buffer blocking device comprises a connecting block fixedly connected to the end of the swing arm, a moving block is arranged in the middle slot of the connecting block, and a connecting plate inserted into the inner cavity of the moving block is vertically fixed at the rear end of the connecting block Outstretched A nylon stopper is fixed to the front end of the movable block outside the connecting block, and the other end of the compression spring connected to the inner side of the front end of the movable block is connected to the connecting plate, and the front end of the adjusting screw threadedly connected to the rear end of the moving block abuts on the connecting plate.

The non-return mechanism includes a check seat fixed to the base, and a check block is eccentrically connected to the top of the check seat by a rotating shaft, and the upper end of the check block is lifted upward, and the lower end and the check seat side 4 Touch.

The jacking mechanism includes a jacking cylinder vertically fixed to the base, and a top end of the piston rod of the jacking cylinder is fixed to a V-shaped bracket.

The clamping mechanism includes a bracket fixed to the base, and a first force arm and a second force arm which are symmetrically disposed on the two sides of the rail with the rail as an axis are connected to the upper portion of the bracket, and a clamping cylinder is disposed under the bracket. One end of the clamping cylinder is movably connected with the lower end of the first force arm, and the other end of the piston rod is movably connected with the lower end of the second force arm, and a clamping block is respectively fixed on the top ends of the first force arm and the second force arm, and the opposite two clamping blocks are respectively A friction pad is respectively fixed on the inner side, and the other ends of the two tension springs fixed to the upper ends of the two sides of the bracket are respectively connected to the first force arm and the second force arm.

The dial mechanism includes a dial cylinder vertically fixed to the base, the piston rod of the dial cylinder is movably connected to one end of the jack, and the other end of the jack is movably connected with a bracket fixed to the clamping mechanism.

The second shifting wheel mechanism includes a mounting plate, and a stopper connecting seat and a cylinder connecting seat are sequentially disposed on the mounting plate along the traveling direction of the wheel pair, and a second retaining wheel cylinder is movably connected to the cylinder connecting seat, and the block is connected at the block The seat is connected with a stopper, the block is L-shaped, and the bent portion is connected to the block connecting seat through the rotating shaft, and the end of the block below the bent portion is movably connected with the piston rod of the second retaining wheel cylinder. .

The invention has the advantages of simple structure, convenient operation, high-efficiency, high-precision and high-quality completion of the assembly task of the CRH2 type EMU bogie wheel-to-shaft end nut assembly, and greatly reduces the labor intensity of the operator, improves the production efficiency, and ensures the safety. The operation of the CRH2 EMU is safe.

BRIEF DESCRIPTION OF THE DRAWINGS:

FIG. 1 is a schematic structural view of a front view of the present invention. 2 is a schematic structural view of a top view of the present invention.

3 is a schematic structural view of a left side portion of the present invention.

Figure 4 is a schematic view showing the structure of the first shifting wheel mechanism.

Figure 5 is a schematic diagram of the structure of the mechanism.

Figure 6 is a schematic view showing the structure of the jacking mechanism.

Figure 7 is a schematic view showing the structure of the clamping mechanism.

Figure 8 is a schematic view of the structure of the dial mechanism.

Figure 9 is a schematic view showing the structure of the second shifting mechanism.

In the figure, 1, the base; 2, the tightening device; 3, the first gear wheel mechanism; 301, the first connecting seat; 302, the second connecting seat; 303, the swing arm; 304, the first retaining wheel cylinder; 305, the first a connecting rod; 306, a second connecting rod; 307, a connecting block; 308, a moving block; 309, a connecting plate; 310, a nylon stopper; 311, a compression spring; 312, an adjusting screw; 4. a check mechanism; 42; check block; 5, jacking mechanism; 51, jacking cylinder; 52, bracket; 6, clamping mechanism; 61, bracket; 62, first arm; 63, second arm 64, clamping cylinder; 65, clamp; 66, friction pad; 67, tension spring; 7, dial mechanism; 71, dial cylinder; 72, ejector; 73, support; 8, second gear 81; mounting plate; 82, block connecting seat; 83, cylinder connecting seat; 84, second gear cylinder; 85, stop; 9, frame; 10, fixed seat; 11, slide rail; Displacement cylinder; 13, electronically controlled rejection; 14, first position sensing device; 15, second position sensing device; Three-position sensing means; 17, a fourth position sensing device; 18, fifth position sensing device.

detailed description:

In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below by way of specific embodiments and in conjunction with the accompanying drawings.

As shown in Figures 1-3, the present invention includes a base 1 disposed under two standard rails, on two standard rails. The base 1 on both sides of the center line is symmetrically distributed with a tightening device 2, a first wheel mechanism 3, a check mechanism 4, a jacking mechanism 5, a clamping mechanism 6 and a dial mechanism 7, on both sides of the center line of the two standard rails The base 1 is symmetrically arranged with a frame 9 , and the fixing seat 10 of the lower part of the tightening device 2 is sleeved on two parallel slide rails 11 on the upper part of the frame 9 , and the fixed seat 10 and the displacement cylinder 1 fixed on the frame 9 The piston rod of 2 is connected; the tightening device 2 comprises a servo motor arranged at the input end, and the servo motor is connected to the trigger sleeve assembly of the output end via a multi-stage planetary reduction mechanism. A check mechanism 4 is arranged below the rail in front of the tightening device 2 along the direction of travel of the wheel pair, and a first gear wheel mechanism 3 is arranged below the rail behind the tightening device 2, and a jacking is provided below the rail opposite the position of the tightening device 2 The mechanism 5, the clamping mechanism 6 and the dial mechanism 7, the lifting mechanism 5 in the traveling direction of the wheel pair is located outside the clamping mechanism 6, opposite to the axial position of the wheel pair, and the dial mechanism is located in front of the clamping mechanism 6, Opposite to the position of the wheel; a second wheel mechanism 8 symmetrical about the center line of the two standard rails is arranged below the rail in front of the check mechanism 4 in the direction of travel of the pair; electronic control is rejected on the side of the base 1 3.

Also included is a wheelset position detecting device, and the wheelset position detecting device is coupled to the electronically controlled reject.

The wheel pair position detecting device is a position sensing device for detecting the position of the wheel pair in the symmetry of the center line of the two standard rails, and the plurality of symmetric position sensing devices are respectively rejected with the electronic control. 3 connected. The position sensing devices are eight, and the four pairs are symmetrically disposed on the center line of the two standard rails; the first pair of first position sensing devices 14 are disposed between the second wheel mechanism 8 and the check mechanism 4 Below, the second pair of two second position sensing devices 15 are disposed below the rail between the check mechanism 4 and the first wheel mechanism 3, and the third pair of third position sensing devices 16 are disposed at the top of the jacking mechanism 5. The upper portion of the cylinder housing, the fourth pair of two fourth position sensing devices 17 are disposed below the rails at the rear of the first wheel mechanism 3 . The position sensing device is a proximity switch.

Also included is a tightening device reset detecting device, and the tightening device reset detecting device is connected to the electronically controlled reject. The tightening device reset detecting device is symmetrically disposed on two axes centered on two standard rails Corresponding to the position sensing device on the rear frame 9 of the lower fixing seat 10 of the tightening device 2, the two position sensing devices are respectively connected to the electronic control rejection 13. The two fifth position sensing devices 18 are respectively disposed at the rear stop positions of the lower fixing bases 10 of the respective tightening devices 2 for detecting whether the tightening device 2 reaches the stop position after the work is completed.

The position sensing device is a proximity switch.

As shown in FIG. 4, it is a schematic structural view of the first shifting wheel mechanism. The first shifting mechanism 3 includes a first connecting seat 301 and a second connecting base 302 which are fixedly disposed on the base 1 in the traveling direction of the pair of wheels, and a swing arm 303 is movably connected to the upper portion of the second connecting base 302. A first gear wheel cylinder 304 is movably connected to the second connecting base 302 below the swing arm 303. The front end of the piston rod of the first wheel cylinder 304 is connected to one end of the first link 305 and the second link 306 through a rotating shaft, respectively. The other end of the first link 305 is movably connected to the swing arm 303, and the other end of the second link 306 is movably connected to the first connecting seat 301, and the end of the swing arm 303 connected to the first link 305 is fixedly suspended. Punch the blocking device.

The buffer blocking device includes a connecting block 307 fixed to the end of the swing arm 303. A moving block 308 is disposed in the intermediate slot of the connecting block 307, and an insertion block 308 is vertically fixed at the rear end of the connecting block 307. The connecting plate 309 in the cavity is fixed with a nylon stopper 310 at the front end of the movable block 308 extending outside the connecting block 307, and the other end of the compression spring 311 connected to the inner side of the front end of the movable block 308 is connected with the connecting plate 309, and the movable block. 308 The front end of the adjusting screw 312 of the rear threaded connection abuts on the connecting plate 309. The cushioning means cushions the impact of the moving wheel pair on the first wheel mechanism 3 and extends the service life of the first wheel mechanism 3.

As shown in Figure 5, the structure of the mechanism is as far back as possible. The check mechanism 4 includes a check seat 41 fixed to the base 1 , and a check block 42 is eccentrically connected to the top of the check seat 41 via a rotating shaft, and the upper end of the check block 42 is lifted upward, and the lower end is heavy. It is in contact with the side 4 of the check seat 41.

As shown in FIG. 6, it is a schematic structural view of the jacking mechanism. The jacking mechanism 5 includes a jacking cylinder 51 vertically fixed to the base 1, and a top end of the piston rod of the jacking cylinder 51 is attached to a V-shaped bracket 52. As shown in Figure 7, it is a schematic diagram of the structure of the clamping mechanism. The clamping mechanism 6 includes a bracket 61 fixed to the base 1 , and a first force arm 62 and a second force arm 63 symmetrically disposed on both sides of the rail with the rail as an axis are connected to the upper portion of the bracket 61 through the rotating shaft. A clamping cylinder 64 is disposed below, the clamping cylinder 64-end is movably connected to the lower end of the first force arm 62, and the other end piston rod is movably connected to the lower end of the second force arm 63, at the first force arm 62 and the second force arm 63. The top end is respectively fixed with a clamping block 65, and a friction pad 66 is respectively fixed on the inner side of the opposite two clamping blocks 65, and the other ends of the two tension springs 67 fixed to the upper ends of the two sides of the bracket 61 are respectively coupled with the first force arm 62 and the first The two arms 63 are connected. The tension spring 67 is used to balance the states of the first force arm 62 and the second force arm 63.

As shown in Figure 8, it is a schematic diagram of the structure of the dial mechanism. The dial mechanism Ί includes a dial cylinder 71 vertically fixed to the base 1. The piston rod of the dial cylinder 71 is movably connected to the apex 72 end, and the other end of the ram 72 is fixedly coupled to the clamping mechanism 6 The holder 73 on the bracket 61 is movably connected.

As shown in FIG. 9, it is a schematic structural view of the second shifting mechanism. The second shifting mechanism 8 includes a mounting plate 81. On the mounting plate 81, a stopper connecting seat 82 and a cylinder connecting seat 83 are sequentially disposed in the traveling direction of the wheel pair, and a second retaining wheel is movably connected to the cylinder connecting seat 83. The cylinder 84 is movably connected to the block connecting seat 82 with a block 85. The block 85 is L-shaped, and the bent portion is connected to the block connecting seat 82 through the rotating shaft, and the end of the block 85 below the bent portion is formed. The portion is movably coupled to the piston rod of the second shift cylinder 84.

When working, turn on the power and servo system of the electronically controlled rejection 1 and enter the working interface. The moving wheel pair to be repaired comes from the previous station, the electric control refuses to control the second wheel mechanism 8 to operate, and the piston rod of the second wheel cylinder 84 extends to drive the block 85 to rotate, so that the upper end of the block 85 Lowering, the moving wheel pair passes the second wheel mechanism 8 along the track. When the moving wheel pair touches the first position sensing device 14, the first position sensing device 14 sends a moving wheel pair entering signal to the electronically controlled rejection 1 3, and the electronically controlled rejection 13 controls the first wheel gear mechanism 3 to operate, first The piston rod of the wheel cylinder 304 is extended by the first link 305 and the second link 306 to lift up the buffer blocking device at the end of the swing arm 303, and block the wheel pair to make it accurate to the overhaul station; At the same time, the second wheel cylinder 84 of the second wheel mechanism 8 is controlled to operate, and the piston rod retracts to drive the block 85 to rotate, so that the upper end of the block 85 rises to prevent other pairs of the wheel to be inspected from entering the service area. When the current moving wheel pair touches the check block 42 in the check mechanism 4, the check block 42 is pushed to rotate about the rotating shaft under the action of the gravity of the moving wheel pair, and the moving wheel pair passes over the check block 42 The return block 42 under the action of the gravity of the lower end portion thereof, causes the check block 42 to be reset, so that the lower end of the check block 42 and the side of the check seat 41 are touched, and the upper end light portion is lifted upward. When the moving wheel pair reaches the inspection station between the first wheel mechanism 3 and the check mechanism 4, it is blocked by the buffer blocking device in the first wheel mechanism 3, and at the same time, the moving wheel pair touches the second under the rail. The position sensing device 15 and the second position sensing device 15 send the moving wheel pair to the electronic control reject 13 to reach the maintenance station signal, and the electronic control rejects 13 to control the lifting mechanism 5 to act, and the piston rod of the jacking cylinder 51 rises upward. The upper V-shaped bracket 52 holds the moving wheel pair up until the shaft end nut is positioned opposite the trigger assembly of the tightening device 2. At the same time, the third position sensing device 16 disposed on the upper side of the housing of the jacking cylinder 5 1 sends the moving wheel pair to the assembly position signal to the electronically controlled reject 13 to electrically control the clamping cylinder in the clamping device 6 In the action of 64, the piston rod is extended to drive the first force arm 62 and the second force arm 63 to rotate inward, and the moving wheel pair is clamped by the upper clamp 65. After being clamped into position, the operator controls the displacement cylinder 1 2 by controlling the rejection, and the piston rod is extended by the fixing seat 10 to drive the tightening device 2 to advance along the sliding rail 1 1 when the end face of the tightening device 2 is tightened. When the upper end of the moving wheel pair shaft nut is quickly contacted, the displacement cylinder 12 stops to extend, and the operator manually rotates the wrench sleeve at the front end of the tightening device 2, so that the wrench sleeve and the shaft end nut just rush upward, and then the displacement cylinder is passed. 12 Drive the tightening device 2 to continue forward until the trigger sleeve and the shaft end nut are completely aligned. At this time, the operator can start the servo motor in the tightening device 2, and drive the wrench to complete the tightening operation of the shaft end nut. When the shaft end nut assembly work is passed, the servo motor of the tightening device 2 stops working, the electric control refuses to control the displacement cylinder 12, and the piston rod drives the tightening device 2 to move backward through the fixing seat 10, so that the tightening device 2 is moved. The front end wrench is withdrawn. When the fixing seat 10 touches the fifth position sensing device 18 on the frame 9, the fifth position sensing device 18 sends the tightening device to exit the in-position signal, The control 13 controls the clamping cylinder 64 in the clamping mechanism 6 to operate, and the piston rod retracts to rotate the first force arm 62 and the second force arm 63 outwardly, so that the upper clamp 65 releases the wheel pair. Then, the electronically controlled reject 13 controls the jacking cylinder 51 in the jacking mechanism 5 to operate, and the piston rod descends to drive the V-shaped bracket 52 to slowly lower the moving wheel pair until the moving wheel falls onto the rail. After the moving wheel is in the position, the third position sensing device 16 on the upper side of the housing of the lifting cylinder 51 sends a wheel landing in-position signal. At this time, if the next station is idle, the electronic control 13 controls the first gear. The first wheel cylinder 304 of the mechanism 3 operates, and the piston rod retracts through the first link 305 and the second link 306 to bring the cushioning device at the end of the swing arm 303 to fall. After falling into position, the electronically controlled 13 controls the dial cylinder 71 in the dial mechanism ,, the piston rod rises to drive the ram 72 to rotate around the support 73, the rear portion of the ejector 72 rises upward, and the moving wheel pair is dialed Move it along the rails away from the inspection station to complete the wheeling action. When the moving wheel pair touches the fourth position sensing device 17 under the rear rail of the first wheel mechanism 3, the fourth position sensing device 17 sends a signal to the wheel to the maintenance station, and the electronic control rejects 13 The dial cylinder 71 in the control dial mechanism 动作 is operated, and the piston rod is lowered to drive the ejector 72 to reset, and the assembly task of the pair of moving wheels is completed. When the new moving wheel pair needs to be repaired, the above steps can be repeated to complete the assembly work for the next moving wheel pair.

The axle assembly nut assembly system of the present invention can complete the assembly task of the CRH2 type EMU bogie wheel-to-shaft end nut with high efficiency, high precision and high quality, and greatly reduces the labor intensity of the operator and improves the production efficiency. The operation safety of the CRH2 EMU is guaranteed.

The above-mentioned embodiments are not intended to limit the scope of the present invention, and any alternative modifications or variations made to the embodiments of the present invention will fall within the scope of the present invention.

Where the invention is not described in detail, it is well known to those skilled in the art.

Claims

Claim

1. A CRH2 type EMU shaft end nut assembly system, comprising: a base disposed under two standard rails, and a screwing device and a first shifting wheel mechanism symmetrically distributed on the bases on both sides of the center line of the two standard rails , the non-return mechanism, the jacking mechanism, the clamping mechanism and the dial mechanism, the frame is symmetrically arranged on the bases on both sides of the center line of the two standard rails, and the fixing seat at the lower part of the tightening device is set on the two parallel rails at the upper part of the rack The fixing seat is connected with the piston rod of the displacement cylinder fixed on the frame; the stopping mechanism is arranged below the rail in front of the tightening device along the traveling direction of the wheel pair, and the first gear wheel mechanism is arranged below the rail behind the tightening device Providing a lifting mechanism, a clamping mechanism and a dial mechanism under the rail opposite to the position of the tightening device; and arranging symmetrically along the center line of the two standard rails under the rail in front of the check mechanism along the direction of the wheel pair Second wheel mechanism; electronically controlled on the side of the base.

2. The CRH2 type EMU shaft end nut assembly system according to claim 1, further comprising: a wheel pair position detecting device, wherein the wheel pair position detecting device is connected to the electronic control.

3. The CRH2 type EMU shaft end nut assembly system according to claim 2, wherein: the wheel set position detecting device is a plurality of detecting wheels that are symmetrically disposed with the center line of the two standard rails as an axis. For the position sensing device at the position where the vehicle is traveling, a plurality of symmetrically arranged position sensing devices are respectively connected to the electronically controlled rejection.

4. The CRH2 type EMU shaft end nut assembly system according to claim 1 or 2, further comprising: a tightening device reset detecting device, wherein the tightening device reset detecting device is connected to the electronic control.

5. The CRH2 type EMU shaft end nut assembly system according to claim 4, wherein: the tightening device reset detecting device is symmetrically disposed on the lower part of the corresponding tightening device with two center rails of the two standard rails as axes Position sensing device on the rear frame of the fixed seat, two position sensing devices respectively Refused to the electronic control.

6. The CRH2-type EMU shaft end nut assembly system according to claim 1, wherein: the first shifting wheel mechanism comprises a first connecting seat fixed to the base and sequentially disposed along a traveling direction of the wheel pair. And a second connecting seat, a swing arm is movably connected to the upper portion of the second connecting seat, and a first retaining wheel cylinder is movably connected to the second connecting seat below the swing arm, and the front end of the piston rod of the first retaining wheel cylinder passes through the rotating shaft respectively One end of the first connecting rod and the second connecting rod are connected, the other end of the first connecting rod is movably connected with the swing arm, and the other end of the second connecting rod is movably connected with the first connecting seat, and the pendulum connected to the first connecting rod A buffer blocking device is attached to the end of the arm.

7. The CRH2 type EMU shaft end nut assembly system according to claim 6, wherein: said buffer blocking means comprises a connecting block fixed to an end of the swing arm, in an intermediate groove of the connecting block. a moving block is arranged, a connecting plate inserted into the inner cavity of the moving block is vertically fixed at a rear end of the connecting block, and a nylon stopper is fixed at a front end of the moving block outside the connecting block, and is connected to the inner side of the front end of the moving block. The other end of the compression spring is connected to the connecting plate, and the front end of the adjusting screw threadedly connected to the rear end of the moving block abuts on the connecting plate.

8. The CRH2 type EMU shaft end nut assembly system according to claim 1, wherein: the non-return mechanism comprises a check seat fixed to the base, and is eccentrically connected to the top of the check seat through the rotating shaft. At the end of the block, the upper end of the check block is tilted upward, and the lower end is in contact with the side 4 of the check seat.

9. The CRH2-type EMU shaft end nut assembly system according to claim 1, wherein: the jacking mechanism comprises a jacking cylinder vertically fixed to the base, and a piston rod top of the jacking cylinder is fixed. Connected to a V-shaped block.

10. The CRH2-type EMU shaft end nut assembly system according to claim 1, wherein: the clamping mechanism comprises a bracket fixed to the base, and the rail is axially symmetrically connected to the upper portion of the bracket through the rotating shaft. a first force arm and a second force arm disposed on both sides of the rail, and a clamping cylinder is disposed under the bracket, one end of the clamping cylinder is movably connected with the lower end of the first force arm, and the other end of the piston rod and the lower end of the second arm The movable connection is respectively fixed with a clamping block at the top ends of the first force arm and the second force arm, and a friction pad is respectively fixed on the inner sides of the opposite two clamping blocks, and the other ends of the two tension springs fixedly attached to the upper ends of the two sides of the bracket respectively It is connected to the first force arm and the second force arm.

11. The CRH2 type EMU shaft end nut assembly system according to claim 1, wherein: the dial mechanism comprises a dial cylinder vertically fixed to the base, and a piston rod of the dial cylinder and One end of the jack is movably connected, and the other end of the jack is movably connected to a bracket fixed to the clamping mechanism.

12. The CRH2 type EMU shaft end nut assembly system according to claim 1, wherein: the second shifting wheel mechanism comprises a mounting plate, and a stopper is sequentially arranged on the mounting plate along the traveling direction of the wheel pair. a connecting seat and a cylinder connecting seat, a second retaining wheel cylinder is movably connected to the cylinder connecting seat, and a stopper is movably connected to the block connecting seat, the block is L-shaped, and the bent portion passes through the rotating shaft and the stopping block The connecting seats are connected, and the end of the block below the bent portion is movably connected with the piston rod of the second shifting cylinder.