CN221527579U - Helicopter tail transmission shaft measuring device - Google Patents

Abstract

The utility model relates to a helicopter tail transmission shaft measuring device, which comprises a clamp assembly, a pointer type dial indicator frame, a tooth-sleeved measuring meter frame and a measuring head, wherein the clamp assembly is arranged on the pointer type dial indicator frame; the clamp assembly is arranged on the sleeve tooth or the universal joint mounting seat, and the pointer type dial indicator frame is arranged on the clamp assembly; the pointer type dial indicator frame is fixed with a pointer type dial indicator, and the measuring head is arranged at the front end of the pointer type dial indicator frame; the tooth-sleeved measuring meter frame is fixed on the clamp assembly; a digital display dial indicator is fixed on the tooth sleeving measuring meter frame; when the device works, the tail transmission shaft is rotated, coaxiality or gap change can be reflected to the dial indicator by the measuring head, and the display reading on the dial indicator for three times is the required measuring distance. The beneficial effects achieved by the utility model are as follows: the tail beam is ingenious in design, reasonable in structure, high in measurement accuracy, simple to assemble and disassemble, convenient to carry and suitable for being used at various occasions such as regular maintenance, and the problem that the tail beam is inconvenient to measure due to narrow space is solved.

Description

Helicopter tail transmission shaft measuring device

Technical Field

The utility model relates to the technical field of measurement of tail transmission shafts of helicopters, in particular to a device for measuring the tail transmission shafts of helicopters.

Background

The tail transmission shaft of the helicopter is formed by combining multiple sections and is divided into a movable shaft and a rigid shaft, and the tail transmission shaft is fixed on a tail beam through a plurality of universal joint mounting seats. The tail transmission shaft has large span on the helicopter body and high rotating speed, various alternating loads need to be overcome in the working environment, and the state of the tail transmission shaft directly influences the performance and reliability of the helicopter and even the flight safety. Therefore, when overhauling or overhauling, the helicopter reassembled with the tail transmission shaft must perform multiple index checks on the assembly state of the tail transmission shaft so as to ensure the performance and reliability of the helicopter.

Referring to fig. 8, the tail transmission shaft includes a movable shaft, a sleeve tooth is sleeved outside the movable shaft, the sleeve tooth is mounted on a universal joint mounting seat through a bearing, the universal joint mounting seat is fixed on the inner wall of a tail beam of the helicopter, and after the tail transmission shaft is assembled, the coaxiality, a support gap and a sleeve tooth gap of the movable shaft of the tail transmission shaft need to be measured so as to ensure the assembly correctness of the tail transmission shaft. The tail transmission shaft of the helicopter is positioned above the tail beam, the tail beam has long and small space, special structure and can not measure coaxiality, sleeve tooth clearance and support clearance of the movable shaft of the tail transmission shaft according to the requirements by using a conventional measuring tool. Therefore, the invention provides a measuring device for a tail transmission shaft of a helicopter, which is used for measuring the coaxiality of the tail transmission shaft, the gap between the sleeve teeth and the gap between the supports.

Disclosure of utility model

The utility model aims to overcome the defects of the prior art, provides a helicopter tail transmission shaft measuring device with simple structure and convenient measurement, and solves the problems of narrow tail beam space and difficult tail transmission shaft data measurement.

The aim of the utility model is achieved by the following technical scheme: the utility model provides a helicopter tail transmission shaft measuring device, the tail transmission shaft includes the loose axle, and the outer staple bolt of loose axle has a cover tooth, and the cover tooth is the tube-shape, and the cover tooth passes through the bearing to be installed on the universal joint mount pad, and the both ends stretch out outside the universal joint mount pad about the cover tooth, and the universal joint mount pad is fixed on the inner wall of the tail boom of helicopter, its characterized in that: comprises a clamp assembly, a pointer type dial indicator frame and a measuring head;

The clamp assembly is hooped on the sleeve teeth, the clamp assembly is provided with a pointer type dial indicator through a pointer type dial indicator frame, and a measuring rod of the pointer type dial indicator is parallel to the central line of the movable shaft;

The measuring head is in a bent shape, the bent part is hinged to the front end of the pointer type dial indicator frame, the measuring rod of the pointer type dial indicator props against one end of the measuring head, and the other end of the measuring head props against the surface of the movable shaft;

The coaxiality deviation exists from the outer surface of the movable shaft to the central axis of the tail transmission shaft, each point on the diameter of the surface of the movable shaft falls on the central line of the tail transmission shaft to change, when the movable shaft rotates, the surface of the movable shaft acts on the measuring head to drive the measuring head to rotate, meanwhile, the other end of the measuring head drives the measuring rod of the pointer type dial indicator to stretch out and draw back, the stretch out and draw back amount is reflected to the pointer type dial indicator, and the numerical value is the coaxiality of the tail transmission shaft so as to realize coaxiality measurement of the tail transmission shaft.

Further, applying corresponding thrust along the radial direction of the movable shaft of the tail transmission shaft through a digital display thrust meter, and generating displacement of the movable shaft along the radial direction, wherein the displacement is a radial gap between the movable shaft and the sleeve teeth; when the movable shaft moves along the radial direction, the movable shaft moves to apply thrust to the measuring head, so that the measuring head rotates, the other end of the measuring head acts on a measuring rod of the pointer type dial indicator, the measuring rod moves in a telescopic manner, the moving amount is displayed on the pointer of the pointer type dial indicator, and the moving amount is a support gap, so that support gap measurement is realized.

Further, the tail transmission shaft measuring device also comprises a tooth sleeving measuring meter frame;

the clamp assembly is hooped on the universal joint mounting seat, and the tooth sleeving measuring meter frame is fixed on the clamp assembly; the tooth-sleeved measuring meter frame is provided with a digital display dial indicator;

The measuring head of the digital display dial indicator always contacts with the surface of the sleeve tooth, the sleeve tooth rotates, the distance between the surface of the sleeve tooth and the universal joint mounting seat changes, the surface of the sleeve tooth acts on the measuring head of the digital display dial indicator to drive the measuring head of the digital display dial indicator to move, the moving amount of the measuring head of the digital display dial indicator is displayed on a display screen of the digital display dial indicator, and the moving amount is the gap between the sleeve tooth to realize gap measurement between the sleeve tooth.

Further, the pointer type dial indicator frame comprises a U-shaped clamp, a U-shaped base, a dial plate frame and a handle;

The U-shaped clamp is sequentially connected with a U-shaped base at the rear end, the rear end of the U-shaped base is connected with a dial frame, and the rear end of the dial frame is connected with a handle;

The front end of the pointer type dial indicator frame is provided with a U-shaped clamp, holes are formed in two sides of the U-shaped clamp, and a cylindrical pin penetrates through the measuring head to be fixed at the front end of the dial indicator frame;

The U-shaped base is connected with the U-shaped clamp, screw holes are respectively formed in two sides of the U-shaped base, round head screws penetrate through the screw holes, a screw needle head is locked by a locking nut, a pointer type dial indicator is locked and fixed, and the pointer type dial indicator body is placed in the dial plate frame; the dial frame is a hollowed-out disc, the whole disc is obliquely upwards placed, the front end of the disc is horizontal, the surface of the rear end of the disc forms an acute angle with the ground, and a rectangular cavity is formed in the upper surface of the rear end of the disc;

The bottom of the pointer type dial indicator frame is provided with a handle, and the handle is fixed on the lower clamp through a screw and a cylindrical pin; the handle is rectangular, two parallel perforations are formed along the strip direction, a strip protrusion is arranged below the upper perforation on one side, a round head screw penetrates through the upper perforation from the strip protrusion side, a cylindrical pin penetrates through the lower perforation, and the pointer type dial indicator is fixed on the lower clamp.

Further, the measuring head comprises a bottom plate and a contact;

The bottom plate is in an upper long plate shape, and one surface of the bottom plate always props against the pointer type dial indicator measuring head;

The bottom of the bottom plate is in a sleeve ring shape, the cylindrical pin penetrates through the cavity, the fixed position is arranged at the front end of the pointer type dial indicator, and the cylindrical pin forms a bearing structure to ensure that the measuring head can flexibly rotate;

During operation, the measuring head can rotate around the rotating shaft on the pointer type dial indicator frame, and numerical value changes can be synchronously reflected to the pointer type dial indicator through the measuring head, so that the measuring direction of the pointer type dial indicator during use is changed, and the space is saved.

Further, the clamp assembly comprises an upper clamp and a lower clamp; one end of the two are hinged, the other end of the two is provided with a group of connecting lugs, the connecting lugs are provided with threaded holes, and locking screws penetrate through the threaded holes to lock and fix the upper clamp and the lower clamp;

The middle part of the upper clamp is provided with a threaded hole, the two sides of the lower clamp are symmetrically provided with threaded holes, and the fixing screw is simultaneously inserted into the fixed clamp assembly on the sleeve tooth;

the lower clamp comprises a U-shaped support, two sides of the U-shape are correspondingly provided with two threaded holes, a round head screw needle penetrates through the upper threaded hole, a cylindrical pin penetrates through the lower threaded hole, and the pointer type dial indicator frame is matched and fixed;

The U-shaped base provides an installation position for the pointer type dial indicator frame, so that the radial installation of the pointer type dial indicator is realized; the clamp assembly is installed on the tail transmission shaft in a hoop mode, and the installation space of the dial indicator holding part is saved.

Further, the tooth-sleeved measuring meter frame comprises a connecting screw rod, a hexagonal nut, a backup nut, a tooth-sleeved meter clamp and a set screw;

the top end of the connecting screw rod is inserted into the connecting lug of the clamp assembly, threads are arranged outside the top end, and the connecting screw rod is screwed with the threaded hole of the connecting lug; the hexagonal nut penetrates into the upper part of the connecting screw rod to lock and fix the connecting screw rod and the clamp assembly;

The bottom of the connecting screw is inserted into the tooth sleeving surface clamp and screwed with the internal threaded hole of the tooth sleeving surface clamp; the backup screw cap is sleeved on the joint of the connecting screw rod and the tooth sleeving surface clamp, and the tooth sleeving surface clamp is fixed on the connecting screw rod;

The lower end of the tooth sleeving meter clamp clamps the digital display dial indicator, the set screw stretches into the transverse threaded hole at the bottom end of the tooth sleeving meter clamp, and the digital display dial indicator is locked on the tooth sleeving meter clamp.

When measuring the cover tooth clearance, install the cover tooth measuring table frame and fix on the clamp subassembly, this simple structure is firm, and the loading and unloading is simple and easy, and the fixed number of being convenient for shows the percentage table.

The utility model has the following advantages:

Facilitating measurement in confined spaces;

The traditional dial indicator measuring mode needs to be installed on the holder, and the measuring rod needs to be perpendicular to the ground; the tail transmission shaft is assembled and disassembled in a complex manner, the tail transmission shaft is preferably not disassembled during maintenance, the tail transmission shaft is arranged in the tail beam, the tail beam is generally designed to be long and narrow in order to reduce the weight and the flight resistance, the tail beam is narrow in space, maintenance staff is contracted in the tail beam for maintenance every time, and no enough space exists for the measurement of the tail transmission shaft to be used for mounting and measuring a holder; the utility model adopts a mode of being arranged on the tail transmission shaft for measurement, and solves the problem of narrow space by designing a measuring head to change the measurement direction.

The measurement data is accurate;

The traditional wire drawing method is used for measuring coaxiality and other data, namely the wire drawing method is a shaft system centering method, and whether the actual center line of the shaft system meets the requirement of a theoretical center line is determined by positioning the movable shaft of the tail transmission shaft. In measuring coaxiality, an elongated wire is used to fix it at a position reference point a. And (3) winding the pull wire around the movable shaft of the tail transmission shaft and fixing the pull wire at the other position B. And measuring the distance between the stay wire and the movable shaft of the tail transmission shaft by using a measuring tool such as a caliper or a vernier caliper, and obtaining the coaxiality of the movable shaft of the tail transmission shaft according to the measuring result.

The key point of the stay wire method technology for coaxiality measurement is the adjustment of zero point, namely whether a steel wire line passes through the center line of a movable shaft of a tail transmission shaft perfectly, and besides the measurement, the adjustment of a bracket is also required. The measurer has great difference in experience reading and the like due to different working time, so that the wire drawing method requires the measurer to have certain construction experience, otherwise, the measuring precision is affected.

The utility model uses the mechanical dial indicator and the digital display dial indicator to ensure accurate and reliable measurement data.

The use is convenient and simple, the cost is low, and the method is suitable for on-site detection;

The traditional three-dimensional laser scanning method has complex equipment, is inconvenient to carry and has higher cost; the utility model has the advantages of ingenious structure, simple disassembly, convenient use, low production cost, portability and suitability for overhauling in different conditions.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the structure of the tooth set measuring meter frame of the present utility model;

FIG. 3 is a diagram showing the installation of a dial indicator;

FIG. 4 is a schematic view of the lower clip;

FIG. 5 is a schematic diagram of the structure of a pointer type dial indicator;

FIG. 6 is a schematic diagram of the structure of a pointer type dial indicator (top view);

FIG. 7 is a schematic diagram of the structure of the probe;

FIG. 8 is a schematic structural view of a tail drive shaft;

In the figure: 1-clamp assembly, 2-pointer type dial indicator frame, 3-set tooth meter frame, 4-measuring head, 5-pointer type dial indicator, 6-digital display dial indicator, 7-tail transmission shaft movable shaft, 8-set tooth, 9-universal joint mounting seat, 11-upper clamp, 12-lower clamp, 121-semicircle clamp base, 122-U-shaped support, 21-U-shaped clamp, 22-U-shaped base, 23-dial plate frame, 24-handle, 31-connecting screw, 32-hexagonal nut, 33-backup nut, 34-set tooth meter clamp, 35-backup screw, 41-bottom plate and 42-contact.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings, but the scope of the present utility model is not limited to the following.

It should be noted that, the azimuth or positional relationship indicated by "left", "right", etc. is based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship conventionally put in use of the inventive product, or the azimuth or positional relationship conventionally understood by those skilled in the art, such terms are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present utility model.

It should be noted that, under the condition of no conflict, the embodiments of the present utility model and the features and technical solutions in the embodiments may be combined with each other.

Referring to fig. 1 to 8, the utility model provides a device for measuring a tail transmission shaft of a helicopter, which is mainly used for measuring related data of a movable shaft on the tail transmission shaft; the tail transmission shaft comprises a movable shaft 7, a sleeve tooth 8 is hooped outside the movable shaft 7 of the tail transmission shaft, the sleeve tooth 8 is arranged in a universal joint mounting seat 9 through a bearing, the upper end and the lower end of the sleeve tooth 2 extend out of the universal joint mounting seat 9, and the universal joint mounting seat 9 is arranged on a tail beam of the helicopter;

the tail transmission shaft measuring device comprises a clamp assembly 1, a pointer type dial indicator frame 2 and a measuring head 4; the clamp assembly 1 is hooped on the sleeve teeth 8; the pointer dial indicator frame 2 is fixed on the clamp assembly 1; the pointer type dial indicator 5 is fixed on the pointer type dial indicator frame 2, and a measuring rod of the pointer type dial indicator 5 is parallel to the central line of the movable shaft 7; the measuring head 4 is in a bent shape, the bent part is hinged at the front end of the pointer type dial indicator frame 2, and the positions of the measuring rod of the dial indicator 5 and the measuring head 4 of the measuring device are adjusted, so that the measuring rod of the pointer type dial indicator 5 is propped against one end of the measuring head 4, and the other end of the measuring head 4 is propped against the surface of the movable shaft 7;

During operation, coaxiality deviation exists from the outer surface of the movable shaft 7 to the central axis of the tail transmission shaft, the movable shaft 7 is rotated, the rotation angle is larger than 360 degrees, each point on the diameter of the surface of the movable shaft 7 is changed on the central axis of the tail transmission shaft, the surface of the movable shaft 7 acts on the measuring head 4 to drive the measuring head 4 to rotate, meanwhile, the other end of the measuring head 4 drives the measuring rod of the pointer type dial indicator 5 to stretch out and draw back, the stretching amount synchronously reacts to the pointer type dial indicator 5, the pointer initial value of the pointer type dial indicator 5 is set to be from the minimum value, and at the moment, the maximum reading on the dial indicator is the coaxiality of the tail transmission shaft so as to realize coaxiality measurement of the tail transmission shaft.

When the clearance of the tail transmission shaft support is measured, any position of the measuring device is not changed, the measuring rod of the pointer type dial indicator 5 is still kept to prop against one end of the measuring head 4, and the other end of the measuring head 4 is propped against the surface of the movable shaft 7; the corresponding thrust is applied to the movable shaft 7 by a digital display thrust meter at the position 200mm in front and behind the universal joint mounting seat 9 along the radial direction of the movable shaft 7 of the tail transmission shaft, so that the movable shaft 7 generates displacement along the radial direction, and the displacement is a radial gap between the movable shaft 7 and the sleeve teeth 8; when the movable shaft 7 moves along the radial direction, the movable shaft 7 applies thrust to the measuring head 4 to drive the measuring head 4 to rotate, one end of the measuring head 4 acts on a measuring rod of the pointer type dial indicator 5, the measuring rod stretches and contracts to move, the moving amount synchronously reacts on the pointer type dial indicator 5, and the moving amount is a support gap, so that the measurement of the support gap of the tail transmission shaft is realized.

The tail transmission shaft measuring device is also provided with a tooth sleeving measuring meter frame 3 in a matching way; the clamp assembly 1 is arranged on the universal joint mounting seat 9, and the tooth sleeving measuring meter frame 3 is fixed on the clamp assembly 1; a digital display dial indicator 6 is fixed on the gear-sleeving measuring meter frame 3, and a measuring head of the digital display dial indicator 6 is always contacted with the surface of the gear-sleeving 8;

The tooth sleeving measuring meter frame 3 comprises a connecting screw 31, a hexagonal nut 32, a backup nut 33, a tooth sleeving meter clamp 34 and a set screw 35;

The connecting screw 31 is arranged in the clamp assembly 1 and the tooth-sleeved meter clamp 34, the connecting screw 31 is fixed on the clamp assembly 1 through the hexagonal nut 32, the tooth-sleeved meter clamp 34 and the connecting screw 31 are fixed by the tightening nut 33, and the digital display dial indicator is locked on the tooth-sleeved meter clamp 34 by the tightening screw 35;

When the tooth space of the sleeve is measured, the pointer type dial indicator 5 is taken down from the pointer type dial indicator frame 2, the clamp assembly 1 is taken down from the sleeve tooth 8, the clamp assembly 1 is installed on the universal joint installation seat 9, the connecting screw rod 31 is installed, the connecting screw rod 31 is fixed on the clamp assembly 1 by a spanner, the hexagonal nut 32, the backup nut 33 and the sleeve tooth measuring meter clamp 34 are sequentially installed on the connecting screw rod 31, the digital display dial indicator 6 is installed on the sleeve tooth measuring meter clamp 34, the set screw 35 is rotated, the digital display dial indicator 6 is fastened on the sleeve tooth measuring meter clamp 34, and the measuring head of the digital display dial indicator 6 abuts against the surface of the sleeve tooth 8. The position of the digital display dial indicator 6 is adjusted, so that the dial plate of the digital display dial indicator 6 is convenient for the operator to observe in the direction; the sleeve tooth 8 is rotated, the rotation angle is larger than 360 degrees, the distance between the surface of the sleeve tooth 8 and the universal joint mounting seat 9 is changed, the surface of the sleeve tooth 8 acts on the measuring head of the digital display dial indicator 6 to drive the measuring head of the digital display dial indicator 6 to move, the moving amount of the measuring head of the digital display dial indicator 6 is displayed on the dial plate of the digital display dial indicator 6, and the moving amount is the sleeve tooth clearance (namely, the radial clearance between the surface of the sleeve tooth 8 and the universal joint mounting seat 9) so as to realize the sleeve tooth clearance measurement.

According to the preferred case matching digital display thrust meter of the embodiment, the pointer type dial indicator 5 and the digital display dial indicator 6 are utilized for measuring and reading, the clamp assembly 1 and the measuring head 4 are designed to change the measuring direction during measurement, the dial indicator is fixed on the clamp, the space is saved, the problem that the tail beam part is narrow in space is solved, and the mechanical meter and the digital display meter are adopted for ensuring accurate measuring data and reliable reading.

Referring to fig. 5 and 6, the pointer type dial indicator frame 2 comprises a U-shaped clamp 21, a U-shaped base 22, a dial plate frame 23 and a handle 24; the U-shaped clamp 21 is the forefront end, the U-shaped clamp 21 is connected with the U-shaped base 22 at the back, the dial frame 23 is connected with the U-shaped base 22 at the back, and the handle 24 is connected with the dial frame 23 at the back;

the U-shaped clamp 21 is provided with holes on two sides of the U shape, and a cylindrical pin penetrates through the threaded hole to fix the measuring head 4 at the front end of the pointer type dial indicator frame 2;

The U-shaped clamp 21 is sequentially connected with the U-shaped base 22, two sides of the U are respectively provided with a threaded opening, round head screws penetrate through the openings, lock nuts are sleeved into the extended screws, the pointer type dial indicator 5 is fastened and fixed and transversely placed on the dial frame, and the dial indicator 5 body is placed on the dial frame 23;

The dial plate frame 23 is a hollow disc in the middle part, the disc is used for placing the pointer type dial indicator 5, the whole disc is placed obliquely upwards, the front end base is horizontal, the rear end surface forms an acute angle with the ground, the upper surface of the rear end of the disc is provided with a rectangular cavity, the measuring rod of the pointer type dial indicator 5 is convenient to stretch, and the length of the cavity is the pre-pressing stretching amount preset for the measuring rod of the pointer type dial indicator 5;

The handle 24 is a cuboid, two parallel threaded holes are formed along the strip direction, the diameter of an upper threaded hole is smaller than that of a lower threaded hole, a round head screw penetrates through the upper threaded hole, a cylindrical pin penetrates through the lower threaded hole of the handle, and the pointer type dial indicator frame 2 is matched and fixed on the clamp assembly 1; the pointer type dial indicator frame 2 is fixed on the pointer type dial indicator frame and can rotate around the round head screw to adjust the position of the measuring head 4, ensure that the measuring head contacts with the surface of the movable shaft 7 of the tail transmission shaft, and screw the pointer type dial indicator 5 by the cylindrical pin after the position is well confirmed;

The pointer type dial indicator frame 2 is radially placed, the pointer type dial indicator 5 is also radially placed on the pointer type dial indicator frame 2, the pointer type dial indicator 5 is conveniently placed, the measuring direction is changed, the position of the measuring head 4 is fixed, and one end of the measuring head 4 is guaranteed to be always contacted with a measuring rod of the pointer type dial indicator 5.

Referring to fig. 7, the measuring head 4 is bent integrally and comprises a bottom plate 41 and a contact 42; the measuring head bottom plate 41 is arranged on the pointer type dial indicator frame 2, the measuring head bottom plate 41 is in an upper long plate shape, and one surface of the bottom plate 41 is always contacted with a measuring rod of the pointer type dial indicator 5; the bottom of the measuring head bottom plate 41 is in a collar shape, a cylindrical pin penetrates through the cavity, the fixed bottom plate is arranged at the front end of the pointer type dial indicator frame 2, and the cylindrical pin ensures that the measuring head 4 can flexibly rotate;

The top end of the contact is a sphere, the lower end of the contact is a rod, the rod-shaped end is connected with the bottom plate 41, and the top end of the contact is always contacted with the surface of the movable shaft 7 of the tail transmission shaft;

During operation, the measuring head 4 can rotate around the pointer type dial indicator frame 2, and numerical values are synchronously reflected to the pointer type dial indicator through the measuring head 4, so that the measuring direction of the pointer type dial indicator 5 during use is changed, and the space is saved.

Referring to fig. 1 and 4, the clip assembly 1 includes an upper clip 11 and a lower clip 12; one end of the upper hoop and the lower hoop are hinged, the other end of the upper hoop is provided with a group of connecting lugs, the training lugs are provided with threaded holes, the shrinking near screw penetrates through the threaded holes to lock the upper hoop and the lower hoop, and two ends of the upper hoop and the lower hoop are locked to form a round hoop to be sleeved on the sleeve teeth 8;

The middle part of the upper clamp 11 is provided with a threaded hole, the lower clamp 12 is symmetrically provided with threaded holes at a quarter of a circle, and a fixing screw is inserted into the threaded holes;

When the device works, a locking screw is screwed in to fix a connecting lug formed by the upper clamp 11 and the lower clamp 12, and the whole clamp assembly 1 is hooped on the sleeve tooth 8; the lower clamp 12 is provided with two fixing screw holes, the upper clamp 11 is provided with one fixing screw hole, three fixing screws are screwed in, and the fixing screws are screwed down until the bottom surface of the fixing screw abuts against the end surface of the sleeve tooth 8; in order to ensure the stress balance, three fixing screws are preferably screwed in simultaneously, so that the clamp assembly 1 is parallel to the end surface of the sleeve tooth 8 when being fixed on the sleeve tooth 8;

The middle part of the lower clamp 12 is provided with a U-shaped support 122, a U-shaped groove faces upwards, two sides of the U-shape are correspondingly provided with two threaded perforations, a cylindrical head screw penetrates through the upper threaded hole, a cylindrical pin penetrates through the lower threaded hole, and the pointer type dial indicator frame 2 is screwed and fixed;

The clamp assembly 1 is fixed on the sleeve teeth 8 in a hoop mode, is stably and firmly locked on the sleeve teeth 8, provides radial installation positions for the measurement of the dial indicator, saves space, and is simple in structure and convenient to assemble and disassemble.

Referring to fig. 2, the tooth-set gauge stand 3 includes a connecting screw 31, a hexagonal nut 32, a backup nut 33, a tooth-set gauge clamp 34, and a set screw 35; the top end of the connecting screw rod 31 extends into the connecting lug of the clamp assembly 1, and is provided with external threads which are screwed with the connecting lug; the hexagonal nut 32 penetrates into the upper part of the connecting screw 31 to lock and fix the connecting screw 31 and the clamp assembly 1;

The bottom of the connecting screw 31 is inserted into the tooth sleeving surface clamp 34 and screwed with an internal threaded hole of the tooth sleeving surface clamp 34; the backup nut 33 is sleeved on the joint of the connecting screw 31 and the tooth sleeving meter clamp 34, and the tooth sleeving meter clamp 34 is fixed on the connecting screw 31;

The lower end of the tooth sleeving meter clamp 34 clamps the digital display dial indicator 6, the set screw 35 stretches into a transverse threaded hole at the bottom end of the tooth sleeving meter clamp 34, and the digital display dial indicator 6 is locked on the tooth sleeving meter clamp 34;

The screw head of the set screw 35 is a waist-shaped screw head, penetrates through the threaded hole to lock the digital display dial indicator 6, and is convenient to assemble and disassemble due to waist-shaped design;

when measuring the sleeve tooth clearance, install the sleeve tooth measuring table frame 3 fixed on clamp subassembly 1, this simple structure is firm, and the loading and unloading is simple and easy, and the fixed number of being convenient for shows percentage table 6.

The foregoing examples represent only preferred embodiments, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the utility model, which falls within the scope of the utility model.

Claims (7)

1. Helicopter tail transmission shaft measuring device, tail transmission shaft include loose axle (7), and the outer band of loose axle (7) has cover tooth (8), and cover tooth (8) are the tube-shape, and cover tooth (8) are installed on universal joint mount pad (9) through the bearing, and outside universal joint mount pad (9) were stretched out at both ends about cover tooth (8), and universal joint mount pad (9) are fixed on the inner wall of the tail boom of helicopter, its characterized in that: the tail transmission shaft measuring device comprises a clamp assembly (1), a pointer type dial indicator frame (2) and a measuring head (4);

The clamp assembly (1) is hooped on the sleeve teeth (8), the clamp assembly (1) is provided with a pointer type dial indicator (5) through a pointer type dial indicator frame (2), and a measuring rod of the pointer type dial indicator (5) is parallel to the central line of the movable shaft (7);

The measuring head (4) is in a bent shape, the bent part is hinged to the front end of the pointer type dial indicator frame (2), the measuring rod of the pointer type dial indicator (5) is propped against one end of the measuring head (4), and the other end of the measuring head (4) is propped against the surface of the movable shaft (7);

The coaxiality deviation exists from the outer surface of the movable shaft (7) to the central axis of the tail transmission shaft, the movable shaft (7) is rotated, the surface of the movable shaft (7) acts on the measuring head (4) to drive the measuring head (4) to rotate, meanwhile, the other end of the measuring head (4) drives the measuring rod of the pointer type dial indicator (5) to stretch out and draw back, the stretch out and draw back amount is reflected to the pointer type dial indicator (5), and the numerical value is the coaxiality of the movable shaft (7) of the tail transmission shaft, so that the coaxiality measurement of the tail transmission shaft is realized.

2. The helicopter tail drive shaft measurement apparatus of claim 1 wherein: applying corresponding thrust along the radial direction of the movable shaft (7) of the tail transmission shaft through a digital display thrust meter to enable the movable shaft (7) to generate displacement along the radial direction, wherein the displacement is a radial gap between the movable shaft (7) and the sleeve teeth (8); when the movable shaft (7) moves along the radial direction, the movable shaft (7) moves to generate thrust to the measuring head (4) so that the measuring head (4) moves, the other end of the measuring head (4) acts on a measuring rod of the pointer type dial indicator (5), the measuring rod stretches and contracts to move, the moving amount is displayed on the pointer of the pointer type dial indicator, and the moving amount is a support gap so as to realize support gap measurement.

3. The helicopter tail drive shaft measurement apparatus of claim 1 wherein: the tail transmission shaft measuring device further comprises a tooth sleeving measuring meter frame (3);

The clamp assembly (1) is hooped on the universal joint mounting seat (9), and the tooth sleeving measuring meter frame (3) is fixed on the clamp assembly (1); the gear-sleeved measuring meter frame (3) is provided with a digital display dial indicator (6);

The measuring head of the digital display dial indicator (6) is always in contact with the surface of the sleeve tooth, the sleeve tooth (8) is rotated, the distance between the surface of the sleeve tooth (8) and the universal joint mounting seat (9) is changed, the surface of the sleeve tooth (8) acts on the measuring head of the digital display dial indicator (6) to drive the measuring head of the digital display dial indicator (6) to move, and the moving amount of the measuring head of the digital display dial indicator (6) is displayed on the dial plate of the digital display dial indicator (6) and is the sleeve tooth gap so as to realize sleeve tooth gap measurement.

4. The helicopter tail drive shaft measurement apparatus of claim 1 or 2 wherein: the pointer type dial indicator frame (2) sequentially comprises a U-shaped clamp (21), a U-shaped base (22), a dial plate frame (23) and a handle (24);

the front end of the pointer type dial indicator frame (2) is provided with a U-shaped clamp (21), two sides of the U-shaped clamp are provided with threaded holes, and a cylindrical pin penetrates through the threaded holes to fix a measuring head (4) at the front end of the dial indicator frame;

The U-shaped base (22) is connected with the U-shaped clamp (21), the two sides of the U-shape are provided with through holes, the round head screw penetrates through the through holes, the needle head of the screw is locked by a locking nut, the pointer type dial indicator (5) is locked and fixed, and the dial indicator (5) body is arranged in the dial frame (23);

The dial frame (23) is a hollowed-out disc, the whole disc is obliquely upwards placed, the front end of the disc is horizontal, the lower surface of the rear end of the disc forms an acute angle with the ground, and a cavity is formed in the upper surface of the disc;

The pointer type dial indicator frame (2) bottom is equipped with handle (24), and two parallel perforation are opened along rectangular direction to handle (24), and the button head screw passes the perforation, and the cylindric lock passes down the perforation, fixes pointer type dial indicator frame (2) on clamp subassembly (1).

5. The helicopter tail drive shaft measurement apparatus of claim 1 or 2 wherein: the measuring head (4) comprises a bottom plate (41) and a contact (42);

The upper part of the bottom plate (41) always props against the pointer type dial indicator measuring rod; the bottom of the bottom plate (41) penetrates through the cylindrical pin, and the fixed measuring head (4) is arranged at the front end of the pointer type dial indicator frame (2);

The top end of the contact (42) is always in contact with the surface of the movable shaft (7) of the tail transmission shaft, and the rod-shaped end is connected with the bottom plate (41).

6. A helicopter tail drive shaft measurement apparatus as claimed in claim 3 wherein: the clamp assembly (1) comprises an upper clamp (11) and a lower clamp (12); one end of the two are hinged, the other end of the two is provided with a group of connecting lugs, the connecting lugs are provided with threaded holes, and locking screws penetrate through the threaded holes to lock and fix the upper clamp (11) and the lower clamp (12);

The center of the upper clamp (11) is provided with a threaded hole, the two sides of the lower clamp (12) are symmetrically provided with threaded holes, and a fixing screw is inserted into the threaded holes to fix the clamp assembly (1) on the sleeve teeth (8) or the universal joint mounting seat (9);

the lower clamp (12) is provided with a U-shaped support (122);

Two threaded holes are respectively formed in two sides of the U-shaped support (122), a round head screw penetrates through the upper threaded hole, a locking nut is screwed, a cylindrical pin penetrates through the lower threaded hole, and the cylindrical pin is matched with and fixed with the pointer type dial indicator frame (2).

7. The helicopter tail drive shaft measurement apparatus of claim 3 or 6 wherein: the tooth sleeving measuring meter frame (3) comprises a connecting screw rod (31), a hexagonal nut (32), a backup nut (33), a tooth sleeving meter clamp (34) and a set screw (35);

The top end of the connecting screw rod (31) is inserted into the connecting lug of the clamp assembly (1), threads are arranged outside the top end, and the connecting screw rod is screwed with the threaded hole of the connecting lug; the hexagonal nut (32) locks and fixes the connecting screw rod (31);

The bottom end of the connecting screw (31) is inserted into the tooth sleeving surface clamp (34) and screwed with an internal threaded hole of the tooth sleeving surface clamp (34); the backup nut (33) is sleeved at the joint of the connecting screw (31) and the tooth sleeving meter clamp (34), and the tooth sleeving meter clamp (34) is fixed on the connecting screw (31);

The lower end of the tooth sleeving meter clamp (34) clamps the digital display dial indicator (6), the set screw (35) stretches into a transverse threaded hole at the bottom end of the tooth sleeving meter clamp (34), and the digital display dial indicator (6) is locked on the tooth sleeving meter clamp (34).