CN217682799U

CN217682799U - Universal joint and engineering measuring instrument using same

Info

Publication number: CN217682799U
Application number: CN202221754727.5U
Authority: CN
Inventors: 陆建红; 金中义; 顾春景
Original assignee: Laisai Optoelectronics Technology Co ltd
Current assignee: Laisai Optoelectronics Technology Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-10-28
Anticipated expiration: 2032-07-07

Abstract

The utility model relates to a universal joint and use engineering measuring instrument of this universal joint, universal joint include through the cross upper yoke and the lower yoke that link to each other, the cross includes the first shaft and the second shaft that mutually perpendicular set up, the lower yoke includes the first fork ear that two intervals set up, seted up first mounting hole on the first fork ear, the first mounting hole cooperation is fixed with the first bearing that supports the rotation of second shaft, be equipped with adjusting device on the first fork ear, two one end of adjusting device offsets with the both ends of second shaft respectively and is the point contact, and this point contact position is on the axis of second shaft, adjusting device is suitable for adjusting the position of lower yoke along the axis direction of second shaft; the laser level meter using the novel universal joint has the characteristic of high repeated positioning precision.

Description

Universal joint and engineering measuring instrument using same

Technical Field

The utility model relates to an engineering measuring instrument of universal joint and applied this universal joint for engineering measuring instrument.

Background

Referring to fig. 3-4, a universal joint for an engineering measuring instrument in the prior art includes an upper yoke 2 and a lower yoke 3 connected to each other through a cross 1, where the upper yoke 2 is adapted to be rotatably disposed on a fixed support of a laser level, the lower yoke 3 is adapted to be fixedly connected to a laser assembly, the cross 1 includes a first shaft 6 and a second shaft 7 disposed perpendicular to each other, the lower yoke 3 includes two first yoke lugs 4 disposed at intervals, the first yoke lugs 4 are provided with first mounting holes 5, and first bearings 8 for supporting the second shaft 7 to rotate are fittingly fixed in the first mounting holes 5; the accuracy of the swivel of the first bearing 8 directly affects the accuracy of the positioning of the laser level.

The prior art universal joint has the following problems: because the first bearing 8 inevitably has a radial clearance, the existence of the radial clearance can cause the lower yoke 3 to displace along the axial direction of the second shaft 7 (namely, axial clearance) and generate gravity center offset, the positioning accuracy of the laser level can be influenced after the gravity center offset is generated on the lower yoke 3, the positioning accuracy of each time of the same laser level is different, and the repeated positioning accuracy is poor; in order to ensure that the laser level can obtain good positioning accuracy, a bearing with small axial play is screened out by a tool manually and assembled on the lower yoke 3, and the method can not solve the problem fundamentally and can not achieve the expected effect.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is through the engineering measuring instrument of a universal joint and applied this universal joint, use the laser level meter of the universal joint of this application, have the characteristics that repeated positioning accuracy is high.

In order to solve the technical problem, the utility model provides a pair of universal joint, include the last section fork and the lower section fork that link to each other through the cross each other, the cross includes the primary shaft and the secondary shaft that mutually perpendicular set up, the lower section fork includes the first fork ear that two intervals set up, first mounting hole has been seted up on the first fork ear, the first mounting hole fit in is fixed with the rotatory first bearing of supporting secondary shaft, be equipped with adjusting device on the first fork ear, two adjusting device's one end offsets and is the point contact with the both ends of secondary shaft respectively, and this point contact position is on the axis of secondary shaft, adjusting device is suitable for the position of lower section fork along the axis direction of secondary shaft regulation.

Furthermore, the adjusting device comprises a columnar fixing seat, the fixing seat is arranged in an outer port of the first mounting hole, a threaded hole is formed in the middle of the fixing seat, an adjusting screw is matched with the threaded hole in a threaded manner, counter bores are formed in two ends of the second shaft respectively, balls are matched in the counter bores, and the balls are located between the inner side end faces of the counter bores and the adjusting screw; or the counter bore is arranged at the inner end of the adjusting screw, and the end surface of the second shaft is in point contact with the ball in the counter bore; the adjusting device is simple in structure, the inner end of the adjusting screw is in point contact with the ball, and the point contact position is on the axis of the second shaft.

Further, the end surface of the inner side of the counter bore is a conical surface; the end face of the inner side of the counter bore is a conical surface, so that point contact positions can be better guaranteed to be on the axis of the second shaft.

Furthermore, one end of the fixed seat is in threaded fit with an outer port of the first mounting hole, a limiting ring is arranged in the first mounting hole, and an outer ring of the first bearing is positioned between the limiting ring and the fixed seat; and the fixed seat and the limiting ring are utilized to realize the axial fixation of the outer ring of the first bearing.

Furthermore, the upper section fork comprises two second fork lugs arranged at intervals, a second mounting hole is formed in each second fork lug, and a second bearing for supporting the first shaft to rotate is fixed in each second mounting hole in a matched mode.

The base of the engineering measuring instrument is arranged on an upper yoke of a universal joint.

The utility model has the advantages that: one ends of the two adjusting devices are respectively abutted against two ends of the second shaft, so that the lower yoke and the second shaft are relatively fixed, even if the first bearing has radial play, the lower yoke cannot move along the axis direction of the second shaft, the repeated positioning precision of the laser level meter is ensured, and meanwhile, the requirement of the radial play of the first bearing is also reduced; one ends of the two adjusting devices are respectively abutted against two ends of the second shaft and are in point contact, and the point contact position is on the axis of the second shaft, so that the lower yoke can normally rotate around the axis of the second shaft, and the flexibility of the first bearing cannot be influenced when the adjusting devices are used for adjusting the position of the lower yoke; the laser level meter using the novel universal joint has the characteristic of high repeated positioning precision.

Drawings

In order to clarify the explanation of the innovative principles of the invention and its advantages compared with the known joints, a possible embodiment is described below by way of non-limiting example applying said principles with the aid of the annexed drawings. In the figure:

fig. 1 is a cross-sectional view of a universal joint of the present invention;

FIG. 2 is a cross-sectional view on the centerline of FIG. 1;

FIG. 3 is a cross-sectional view of a prior art gimbal;

fig. 4 is a cross-sectional view on the centerline of fig. 3.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back, 8230; \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific circumstances.

Example 1

As shown in fig. 1-2, the universal joint of the present embodiment includes an upper yoke 2 and a lower yoke 3 connected to each other through a cross 1, where the cross 1 includes a first shaft 6 and a second shaft 7 disposed perpendicular to each other, the lower yoke 3 includes two first yoke ears 4 disposed at an interval, a first mounting hole 5 is opened on the first yoke ear 4, a first bearing 8 supporting the second shaft 7 to rotate is fixed in the first mounting hole 5 in a matching manner, an adjusting device 9 is disposed on the first yoke ear 4, one end of each of the two adjusting devices 9 abuts against two ends of the second shaft 7 and is in point contact, the point contact position is on an axis of the second shaft 7, and the adjusting device 9 is adapted to adjust a position of the lower yoke 3 along an axis direction of the second shaft 7.

The adjusting device 9 comprises a columnar fixing seat 10, the fixing seat 10 is arranged in an outer port of the first mounting hole 5, a threaded hole is formed in the middle of the fixing seat 10, an adjusting screw 11 is in threaded fit with the threaded hole, counter bores 12 are formed in two ends of the second shaft 7 respectively, a ball 14 is matched in the counter bores 12, and the ball 14 is located between an inner side end face 13 of the counter bore 12 and the adjusting screw 11; or, the counter bore 12 is arranged at the inner end of the adjusting screw 11, and the end surface of the second shaft 7 is in point contact with the ball 14 in the counter bore 12; the point contact between the point of the cone and the flat surface can also be made, and this embodiment preferably makes point contact through the ball and the flat surface.

The inner side end surface 13 of the counter bore 12 is a conical surface; the end face of the inner side of the counter bore is a conical surface, so that point contact positions can be better guaranteed to be on the axis of the second shaft.

One end of the fixed seat 10 is in threaded fit with an outer port of the first mounting hole 5, a limiting ring 15 is arranged in the first mounting hole 5, and the outer ring of the first bearing 8 is positioned between the limiting ring 15 and the fixed seat 10; and the fixed seat and the limiting ring are utilized to realize the axial fixation of the outer ring of the first bearing.

The upper yoke 2 comprises two second yokes 18 arranged at intervals, second mounting holes 16 are formed in the second yokes 18, and second bearings 17 for supporting the first shafts 6 to rotate are fixed in the second mounting holes 16 in a matched mode.

Because the inner side ends of the adjusting screws 11 of the two adjusting devices 9 are respectively abutted against the two ends of the second shaft 7, even if the first bearing 8 has radial play, the lower yoke 3 can not be caused to move along the axis direction of the second shaft 7, so that the repeated positioning precision of the engineering measuring instrument (comprising a laser swinger, a total station locator, a distance measurer, a theodolite, a level, an automatic leveling level, a plotting instrument, a laser measuring instrument, a projector, a photographic instrument and the like) adopting the universal joint is ensured, and the requirement on the radial play of the first bearing 8 is also reduced; because one end of each of the two adjusting devices 9 abuts against and is in point contact with two ends of the second shaft 7, and the point contact position is on the axis of the second shaft 7, the lower yoke 3 can normally rotate around the axis of the second shaft 7, and the flexibility of the first bearing 8 is not influenced when the adjusting device 9 is used for adjusting the position of the lower yoke 3; the laser level meter using the universal joint has the characteristic of high repeated positioning precision.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a universal joint, includes upper segment fork (2) and lower section fork (3) that link to each other through cross (1), cross (1) is including first axle (6) and second axle (7) that mutually perpendicular set up, lower section fork (3) are including first fork ear (4) that two intervals set up, first mounting hole (5) have been seted up on first fork ear (4), first mounting hole (5) fit in is fixed with rotatory first bearing (8) of supporting second axle (7), its characterized in that: adjusting devices (9) are arranged on the first fork lugs (4), one ends of the two adjusting devices (9) are respectively abutted against two ends of the second shaft (7) and are in point contact, and the point contact positions are located on the axis of the second shaft (7).

2. The gimbal according to claim 1, wherein: the adjusting device (9) comprises a columnar fixing seat (10), the fixing seat (10) is arranged in an outer port of the first mounting hole (5), a threaded hole is formed in the middle of the fixing seat (10), an adjusting screw (11) is matched with the threaded hole in an internal thread mode, counter bores (12) are formed in two ends of the second shaft (7) respectively, a ball (14) is matched in each counter bore (12), and the ball (14) is located between the inner side end face (13) of each counter bore (12) and the adjusting screw (11); or the counter bore (12) is arranged at the inner end of the adjusting screw (11), and the end surface of the second shaft (7) is in point contact with the ball (14) in the counter bore (12).

3. The gimbal according to claim 2, wherein: the inner side end face (13) of the counter bore (12) is a conical surface.

4. The gimbal according to claim 2, wherein: one end screw-thread fit of fixing base (10) is at the outer port of first mounting hole (5), be equipped with spacing ring (15) in first mounting hole (5), the outer lane of first bearing (8) is located between spacing ring (15) and fixing base (10).

5. The gimbal according to claim 1, wherein: the upper yoke (2) comprises two second yokes (18) arranged at intervals, second mounting holes (16) are formed in the second yokes (18), and second bearings (17) for supporting the first shaft (6) to rotate are fixed in the second mounting holes (16) in a matched mode.

6. An engineering measurement instrument, characterized in that: the base of the engineering surveying instrument is arranged on the upper yoke (2) of the universal joint according to claim 1.