Clamp for shaft end grounding device of motor train unit

Abstract

The utility model discloses a motor train unit shaft end grounding device clamp, which comprises a base and a fixing assembly, the base is provided with a storage box and a drawer, the fixing assembly comprises a working table and an auxiliary fixing piece, the working table is arranged on the base, and the auxiliary fixing piece is arranged on the working table. According to the utility model, the metal part of the grounding cover of the elliptical shaft end grounding device can be completely accommodated through the groove structure, and the stress of the shaft end grounding device in different directions can be restrained; and the shaft end grounding device can be stably placed through the auxiliary fixing piece. By using the clamp, the overhaul efficiency of the shaft end grounding device of the motor train unit is improved, a special tool capable of eliminating external human factors is provided, the number of operators is reduced from two to one, the working efficiency is improved by 50%, meanwhile, the labor intensity of the operators is reduced, the safety of the working environment is ensured, and the clamp has high practicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of clamps, and in particular relates to a clamp for a motor vehicle unit shaft end grounding device. Background Art

[0002] The shaft end grounding device of CRH380B(L) EMU is the most important component of the EMU high-voltage traction system. It is installed at the shaft end of the EMU wheelset to prevent the working current, system fault current and lightning current from damaging the bearing when passing through the bearing, and to provide a safe, economical and effective closed environment for the bearing. The shaft end grounding device is mainly composed of a grounding cover, a friction plate, a carbon brush holder, etc. Among them, whether the appearance of the grounding wire, the grounding carbon brush and the grounding cover is in good condition is the key inspection point in the three-level maintenance and overhaul of the EMU. The on-site maintenance personnel of each railway bureau inspect the grounding wire, the grounding carbon brush, etc. according to the advanced maintenance and overhaul procedures and operation instructions of the Harmony 3 EMU to ensure that the inspection items of the shaft end grounding device meet the standard requirements. If the shaft end grounding cable is broken or corroded by more than 10%, the terminal is damaged or corroded, and the grounding carbon brush is worn beyond the limit, it will be replaced.

[0003] For a long time, the problems of low efficiency and high safety hazards in the replacement of shaft end grounding device parts in the advanced maintenance and overhaul base have always attracted the attention of railway bureau leaders, R&D designers and on-site process personnel. When the parts are replaced, the operator puts the shaft end grounding device on the operating table. Since the bottom of the shaft end grounding device is elliptical, in order to ensure that it does not rotate at will, the operators need to cooperate with each other to complete the three different specifications of bolt tightening, torque calibration and anti-loosening marking in the shaft end grounding device. Among them, one operator holds it with both hands, and the other operator tightens the bolts, calibrates the torque, and paints the anti-loosening mark. After the above processes are completed, the operators cooperate with each other again to complete the surface appearance inspection of the shaft end device. The entire maintenance operation process is completely dependent on the cooperation of multiple people, lacks special auxiliary fixing tooling, is time-consuming and labor-intensive, and poses a personal safety hazard. Based on the above reasons, technical research on special tools for shaft end grounding devices is carried out, and a new tooling is designed to improve operation efficiency and ensure the safety of operators.

[0004] The patent document with the publication number CN215248006U discloses a hemispherical parts fixture, including a medicine bowl, a three-jaw chuck, a turntable, a motor flange a, a motor flange b, a coupling, a transfer shaft, a three-jaw chuck turntable, a three-claw clamp, a servo electric cylinder, and a pad. The solution mainly completes the grasping of hemispherical parts to achieve auxiliary measurement, including the positioning, grasping, clamping and flipping of hemispherical parts, which can realize the grasping of heavy parts and meet the high-precision positioning requirements. However, the fixture is not suitable for the maintenance scene of the advanced shaft end grounding device. The research and analysis are mainly carried out from the aspects of economic cost, maintenance timeliness, and application scope. 1. The National Railway Group Co., Ltd. has always advocated the energy-saving and consumption-reducing management system, and has achieved it through various means such as optimizing on-site operation processes and innovatively developing lightweight equipment. The fixture has a complex structural design, high manufacturing and maintenance costs, and the existing design concept does not match the energy-saving and consumption-reducing management system of the railway bureau. 2. According to the daily and weekly plans for high-level repair parts, the repair parts are repaired and delivered according to the time nodes. At present, in order to realize the streamlined and rhythmic operation process of high-level repair, the repair time of the parts at each workstation has a time node, but the design of the fixture is complex, and it is impossible to achieve the function of fast and accurate positioning and tightening of the parts for batch repair of high-level repairs. It is also time-consuming and labor-intensive in use, and the utilization rate of personnel is not high. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a clamp for an EMU shaft end grounding device, which can solve the problems of waste of human resources and low operating efficiency during the maintenance of the EMU shaft end grounding device.

[0006] The utility model is realized through the following technical solutions.

[0007] The utility model provides a clamp for an axle end grounding device of a motor vehicle group, comprising a base and a fixing assembly, wherein a storage box and a drawer are arranged on the base, and the fixing assembly comprises a workbench and an auxiliary fixing piece, wherein the workbench is arranged on the base, and the auxiliary fixing piece is arranged on the workbench.

[0008] Preferably, the workbench comprises a fixing plate and a placing portion, wherein the fixing plate is arranged on the base, and the placing portion is arranged on the fixing plate, and a groove is arranged on the placing portion, and the groove is arc-shaped.

[0009] Preferably, the auxiliary fixing member includes a fixing member and a latch, the fixing member and the latch are connected, a screw hole A is arranged on the latch, and an adjusting bolt is arranged on the screw hole A.

[0010] Preferably, a through hole and a screw hole B are provided on the fixing member, the latch passes through the through hole to form a connection with the fixing member, and the adjusting bolt passes through the screw hole A and then passes through the latch to be connected with the screw hole B.

[0011] Preferably, protrusions are arranged on the side surface of the placement portion in a circumferential distribution, and screw holes C are arranged on the protrusions.

[0012] Preferably, an opening is provided on one side of the groove.

[0013] Preferably, protective covers are provided at both ends of the latch.

[0014] Preferably, support blocks are provided at both ends of the fixing member.

[0015] Preferably, a partition is provided in the drawer.

[0016] The beneficial effects of the utility model are:

[0017] The utility model can completely accommodate the metal part of the grounding cover of the elliptical shaft end grounding device through the groove structure, and can constrain the forces of the shaft end grounding device in different directions; and the shaft end grounding device can be stably placed through the auxiliary fixing parts. The use of this fixture improves the efficiency of the maintenance of the shaft end grounding device of the CRH380B (L) EMU, provides a special tooling that can eliminate external human factors, reduces the number of operators from 2 to 1, improves work efficiency by 50%, and reduces the labor intensity of operators, ensuring the safety of the working environment, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a front view of the utility model;

[0020] Figure 3 It is a top view of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the latch of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the drawer of the utility model;

[0023] In the figure: 1-base, 11-storage box, 12-drawer, 13-partition, 2-fixing component, 3-workbench, 4-auxiliary fixing part, 5-fixing plate, 6-placing part, 61-groove, 62-protrusion, 63-screw hole C, 64-opening, 7-fixing part, 71-through hole, 72-screw hole B, 73-support block, 8-pin, 81-screw hole A, 82-adjusting bolt, 83-protective cover. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0025] Example:

[0026] like Figures 1 to 5 As shown, a clamp for an EMU axle end grounding device comprises a base 1 and a fixing assembly 2, wherein a storage box 11 and a drawer 12 are arranged on the base 1, and the fixing assembly 2 comprises a workbench 3 and an auxiliary fixing member 4, wherein the workbench 3 is arranged on the base 1, and the auxiliary fixing member 4 is arranged on the workbench 3.

[0027] Multiple storage boxes 11 and drawers 12 are provided, and bolts of different specifications and torques of different sizes can be stored and retrieved by classification, which is convenient for operators to quickly distinguish and retrieve, and changes the previous phenomenon of mixed material loss and serious consumption of torque materials. At the same time, it greatly improves the efficiency of maintenance operators and reduces the serious consumption of materials. The length of the torque body with the longest appearance among the three torques can be used as the standard length of the torque storage box. At the same time, taking the CRH380BL long-form (16-section) EMU as an example, the number of bolts required for the complete replacement of the shaft end grounding device is calculated. In order to improve the maintenance efficiency and solve the problems of time-consuming material retrieval and insufficient materials, all the replacement bolts required for the three long-form EMUs are pre-equipped, and the storage box required for the three long-form EMU bolts is calculated. This volume capacity is used as the volume of the auxiliary tooling storage box.

[0028] The workbench 3 includes a fixed plate 5 and a placement portion 6, the fixed plate 5 is arranged on the base 1, the placement portion 6 is arranged on the fixed plate 5, a groove 61 is arranged on the placement portion 6, and the groove 61 is arc-shaped. The EMU shaft end grounding device is placed on the groove 61, and a soft film can be pasted on the bonding surface inside the groove 61 to prevent the operator from scratching or abrading the surface of the grounding cover of the shaft end grounding device during operation.

[0029] The auxiliary fixing member 4 includes a fixing member 7 and a latch 8, both of which are in an inverted "ㄩ" shape, and the fixing member 7 and the latch 8 are connected, and a screw hole A81 is provided on the latch 8, and an adjusting bolt 82 is provided on the screw hole A81. The length of the latch 8 penetrating the fixing member 7 can be adjusted to adapt to different sizes of EMU shaft end grounding devices.

[0030] The fixing member 7 is provided with a through hole 71 and a screw hole B72. The latch 8 penetrates the fixing member 7 through the through hole 71 to form a connection. The adjusting bolt 82 penetrates the latch 8 through the screw hole A81 and is connected to the screw hole B72.

[0031] The side surface of the placement portion 6 is provided with a plurality of protrusions 62 distributed in a circumference, that is, the protrusions 62 are arranged outside the groove 61, and screw holes C63 are arranged on the protrusions 62. The protrusions 62 are symmetrically arranged in pairs.

[0032] An opening 64 is provided on one side of the groove 61 for adapting to the structure of the EMU axle end grounding device.

[0033] Protective sleeves 83 are provided at both ends of the plug 8. The protective sleeves 83 can be made of rubber or silicone to reduce wear caused by the plug 8 being inserted into the grounding cover bolt hole of the shaft end grounding device.

[0034] Support blocks 73 are arranged at both ends of the fixing member 7. The support blocks 73 are arranged on the water surface so that the fixing member 7 has a larger contact area with the fixing plate 5 when fixing the shaft end grounding device, thereby improving the stability during maintenance.

[0035] The drawer 12 is provided with a partition 13 , which can be a single plate, or arranged in a T-shape or a cross-shape in the drawer 12 , so that the drawer 12 can distinguish and store bolts of different types.

[0036] A method for using a clamp for a shaft end grounding device of a train set comprises the following steps:

[0037] S1: Connect the base 1 and the fixing plate 5 through two M10 bolts; place the shaft end grounding device in the tooling fixing groove 61, and manually move the shaft end grounding device until the bolt hole of its grounding cover is aligned with the screw hole C63; by tightening the adjusting bolt 82, the two ends of the pin 8 are inserted into the inner hole of the grounding cover to achieve auxiliary fixation of the shaft end grounding device;

[0038] S2: Use ratchets and hexagon sockets of different specifications to dismantle the three bolts on the shaft end grounding device; replace the unqualified parts of the shaft end grounding device according to the maintenance procedures and operating instructions;

[0039] S3: After the parts of the shaft end grounding device are replaced, bolts of corresponding specifications are taken out from the storage box 11 or the drawer 12 in turn to tighten the replaced parts; torque is applied in turn using a torque wrench according to the bolt specifications; anti-loosening marks are applied on the hexagonal caps of the bolts according to the standards; the site is cleaned up, and the torque wrenches are stored according to the label names to complete the maintenance operation.

[0040] During the design process of the EMU shaft end grounding device fixture, the inner diameter L1 and outer diameter L2 of the bolt holes on the outer end faces of the grounding cover of the corresponding shaft end grounding device and the maximum distance H1 between the horizontal end face of the grounding cover of the shaft end grounding device and the lowest point of the elliptical groove can be measured with a vernier caliper according to actual needs, so as to design the depth H2 of the groove 61, the diameter L3 and the distance L4 between the screw holes C63 on the symmetrical protrusions 62 on both sides. The groove 61 structure can completely accommodate the metal part of the elliptical shaft end grounding device grounding cover and can constrain the forces on the shaft end grounding device in different directions.

Claims

1. A clamp for a shaft end grounding device of a train set, characterized by: The invention comprises a base (1) and a fixing assembly (2), wherein a storage box (11) and a drawer (12) are arranged on the base (1), and the fixing assembly (2) comprises a workbench (3) and an auxiliary fixing member (4), wherein the workbench (3) is arranged on the base (1), and the auxiliary fixing member (4) is arranged on the workbench (3).

2. A clamp for the axle end grounding device of a train set as claimed in claim 1, characterized in that: The workbench (3) comprises a fixing plate (5) and a placement portion (6); the fixing plate (5) is arranged on the base (1); the placement portion (6) is arranged on the fixing plate (5); a groove (61) is arranged on the placement portion (6); and the groove (61) is arc-shaped.

3. The EMU axle end grounding device fixture as claimed in claim 1, characterized in that: The auxiliary fixing member (4) comprises a fixing member (7) and a latch (8), wherein the fixing member (7) and the latch (8) are connected, a screw hole A (81) is arranged on the latch (8), and an adjusting bolt (82) is arranged on the screw hole A (81).

4. A clamp for the axle end grounding device of a train set as claimed in claim 3, characterized in that: The fixing member (7) is provided with a through hole (71) and a screw hole B (72); the latch (8) passes through the fixing member (7) through the through hole (71) to form a connection; the adjusting bolt (82) passes through the latch (8) through the screw hole A (81) and is connected to the screw hole B (72).

5. The EMU axle end grounding device fixture as claimed in claim 2, characterized in that: The side surface of the placement portion (6) is provided with protrusions (62) distributed in a circumferential manner, and screw holes C (63) are provided on the protrusions (62).

6. A clamp for the axle end grounding device of a train set as claimed in claim 2, characterized in that: An opening (64) is provided on one side of the groove (61).

7. A clamp for the axle end grounding device of a train set as claimed in claim 3, characterized in that: Protective sleeves (83) are provided at both ends of the latch pin (8).

8. The EMU axle end grounding device fixture as claimed in claim 1, characterized in that: Support blocks (73) are provided at both ends of the fixing member (7).

9. The EMU axle end grounding device fixture as claimed in claim 1, characterized in that: A partition board (13) is arranged in the drawer (12).

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