CN210476828U

CN210476828U - Nut mounting device

Info

Publication number: CN210476828U
Application number: CN201921292225.3U
Authority: CN
Inventors: 张敏华; 刘根仓; 冯俊爽; 卞强
Original assignee: Zhangjiagang CIMC Sanctum Cryogenic Equipment Co Ltd
Current assignee: Zhangjiagang CIMC Sanctum Cryogenic Equipment Co Ltd
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2020-05-08
Anticipated expiration: 2029-08-09

Abstract

The utility model provides a nut installation device, including bearing mechanism, pretightning force adjustment mechanism and installation mechanism. The bearing mechanism is provided with a nut tray; the pretightening force adjusting mechanism comprises a thrust assembly and a supporting sleeve, wherein the thrust assembly is arranged on the nut tray; the support sleeve is used for supporting the lower surface of the nut to be installed, the thrust assembly is used for generating an upper thrust to the support sleeve, and the support sleeve is used for lifting the nut to be installed under the action of the upper thrust; the mounting mechanism is arranged on the support sleeve and lifts the nut to be mounted, and the nut tray drives the nut to be mounted to be rotatably mounted on the bolt in the low-temperature storage tank. The utility model discloses utilize to support the cover to produce to the nut and hold in the palm the frictional force of lifting force between nut and the bolt in can eliminating or reducing the field installation, prevent that nut and bolt from taking place to sting the phenomenon, be favorable to the correct quick installation of nut.

Description

Nut mounting device

Technical Field

The utility model relates to a low temperature storage tank field of making, in particular to nut installation device.

Background

For the low-temperature storage tank with the inner tank body and the outer tank body fixed by the large-sized nuts, the nuts are installed on the bolts between the inner tank body and the outer tank body of the low-temperature storage tank from bottom to top in a nut installation mode. The diameter of the nut is large, the self weight is about 150 kilograms, the nut cannot be lifted from the upper part by crane and other hoisting equipment due to the fact that the storage tank is arranged above the nut, the space at the lower part of the low-temperature storage tank is limited, and the crane and other hoisting equipment cannot reach the installation position for auxiliary installation; the nut is very difficult to mount and has extremely low efficiency by being lifted manually. And because the bolt is in the low temperature storage tank vacuum intermediate layer, can not use any anti-bite agent such as lubricating grease, at the in-process of mounting nut, because the nut dead weight is great, the friction of screw thread contact surface produces the heat, the smooth silk phenomenon easily appears, leads to appearing the seizure phenomenon between nut and the bolt easily, and the nut takes out comparatively difficultly, seriously influences nut assembly efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improve nut installation device of installation effectiveness. Another object of the utility model is to provide a have and reduce operation personnel intensity of labour, the prevention nut bolt takes place to sting.

In order to solve the technical problem, the utility model adopts the following technical scheme:

according to one aspect of the present invention, the present invention provides a nut mounting device, comprising a bearing mechanism, a pretightening force adjusting mechanism, a nut tray having a bearing for supporting and fixing a nut to be mounted; the pre-tightening force adjusting mechanism comprises a thrust component arranged on the nut tray and a supporting sleeve positioned on the thrust component; the support sleeve is used for supporting the lower surface of the nut to be installed, the thrust assembly is used for generating an upper thrust to the support sleeve, and the support sleeve is used for lifting the nut to be installed under the action of the upper thrust; the installation mechanism is supported in the downside of bearing mechanism to can drive the nut tray level when rising rotates, with the support cover is lifted treat during the mounting nut, the nut tray drives treat that mounting nut rotary installation is on the bolt in the low temperature storage tank.

Optionally, the thrust assembly comprises a seat sleeve, a sliding part and an elastic part; the seat sleeve is fixedly arranged on the nut tray, the sliding piece is movably arranged in the seat sleeve in a penetrating manner along the vertical direction, and the upper end of the sliding piece is fixedly connected with the supporting sleeve; the elastic piece is clamped between the support sleeve and the seat sleeve, and when the mounting mechanism drives the nut tray to move upwards, the seat sleeve moves upwards along the sliding piece to compress the elastic piece, so that the elastic piece generates an upward thrust on the support sleeve.

Optionally, the sliding member is a sliding rod with threads at two ends, the elastic member is a compression spring, and the thrust assembly further comprises a fixing nut; the supporting sleeve is provided with a threaded hole extending along the vertical direction, and the upper end of the sliding piece is in threaded connection with the threaded hole; the seat sleeve is internally provided with an accommodating groove with an upward notch, and the sliding piece penetrates through the bottom of the accommodating groove from top to bottom and protrudes out of the bottom of the seat sleeve; the fixed nut is in threaded connection with the lower end of the sliding piece, the elastic piece is sleeved on the sliding rod, and the compression spring is clamped between the bottom of the accommodating groove and the surface, facing the accommodating groove, of the support sleeve.

Optionally, the support sleeve is provided with a guide groove extending in the up-down direction, the notch of the guide groove faces the seat sleeve, and the upper end of the seat sleeve extends into the guide groove; the outer surface of the seat cover is distributed with a plurality of scales along the up-down direction, the seat cover moves along the up-down direction, so that the lower edge of the supporting cover is aligned to one of the scales, and the scale value is related to the up-pushing force generated by the elastic piece at present.

Optionally, the mounting mechanism includes a supporting platform, a lifting column penetrating through the supporting platform, a lifting nut fixedly connected with the supporting platform, and a connecting assembly; the outer wall surface of the lifting column is provided with threads with the lead consistent with that of a nut to be mounted, and the lifting nut is sleeved on the outer side of the lifting column to rotationally drive the lifting column to lift; the nut tray is connected with the lifting nut in a linkage mode through the connecting assembly, so that when the lifting nut rotates, the nut tray is driven to rotate synchronously.

Optionally, the connecting assembly includes an annular hand wheel and a synchronous connecting rod; the annular hand wheel comprises an annular outer ring and a connecting rod, the annular outer ring is arranged on the outer side of the lifting nut in a surrounding mode along the circumferential direction of the lifting nut, and two ends of the connecting rod are connected to the annular outer ring and the lifting nut respectively; the synchronous connecting rod is detachably connected between the annular hand wheel and the nut tray.

Optionally, the bearing mechanism further comprises a self-aligning ball bearing, the upper end of the self-aligning ball bearing is embedded into the nut tray, and the lower end of the self-aligning ball bearing is arranged at the upper end of the lifting column.

Optionally, the nut mounting device further includes a pull rod, a flange plate, a pre-tightening elastic member, a limiting member, and a bearing; the lifting column is cylindrical, a clamping part is arranged on the inner wall surface of the lifting column in a protruding mode, and the flange plate is arranged in the lifting column in a flat mode and located on the lower side of the clamping part; the pull rod comprises a rod part and a baffle positioned at the upper end of the rod part, and the rod part sequentially penetrates through the nut tray, the self-aligning ball bearing and the flange plate; the baffle abuts against the top surface of the nut tray, and the limiting piece is fixedly connected with the lower end of the rod part; the rod part is connected with the flange plate through a bearing; the elastic piece is arranged between the flange plate and the limiting piece, so that when the elastic piece is compressed, the flange plate is abutted against the clamping part, and clamping force is provided among the nut tray, the self-aligning ball bearing and the lifting column.

Optionally, at least two nut positioning locking columns arranged at intervals are further convexly arranged on the nut tray, and the nut positioning locking columns are used for extending into the nut to be installed so as to support against the inner side wall of the nut to be installed.

Optionally, the lifting mechanism further comprises a vertical lifting mechanism, and the vertical lifting mechanism is supported below the supporting platform to drive the mounting mechanism and the supporting mechanism to vertically move.

Optionally, two upper side slide rails are arranged on the support platform at intervals, the vertical lifting mechanism comprises a bottom beam and two swing arms, lower side slide rails which are respectively in one-to-one correspondence with the two upper side slide rails are arranged on the bottom beam at intervals, the two swing arms are arranged in a crossed manner, the middle parts of the two swing arms are movably connected through a rotating shaft, and two ends of each swing arm are respectively correspondingly movably connected with one upper side slide rail and one lower side slide rail; through adjusting two contained angle between the swing arm to the drive installation mechanism, bearing mechanism vertical motion.

The utility model discloses in set up the pretightning force adjustment mechanism of installing on the nut tray, the thrust unit mount is on the nut tray for produce ascending thrust to supporting the cover. Because the supporting sleeve is supported below the nut to be installed, the supporting sleeve can generate lifting force on the nut, so that the friction force of a thread contact surface between the nut and the bolt in field installation can be eliminated or reduced, the nut and the bolt are prevented from being seized, and the nut is accurately and quickly installed.

Drawings

Fig. 1 is a side sectional view of an embodiment of the nut mounting apparatus of the present invention;

fig. 2 is a structural view of an embodiment of the nut mounting apparatus of the present invention;

FIG. 3 is a schematic diagram of the pretension adjusting mechanism of FIG. 1;

fig. 4 is a schematic structural view of a part of the bearing pretension fixing device in fig. 1.

The reference numerals are explained below:

1. a nut mounting device; 2. a nut is to be installed;

10. a support mechanism; 11. a nut tray; 111. a nut positioning lock cylinder; 12. a self-aligning ball bearing;

20. a pre-tightening force adjusting mechanism; 21. a thrust assembly; 211. a seat cover; 2111. a containing groove; 212. a slider; 213. an elastic member; 214. fixing a nut; 215. a scale zone; 22. a support sleeve; 221. a guide groove;

30. an installation mechanism; 31. a support platform; 32. a lifting column; 321. a chucking section; 33. a lifting nut; 34. a connecting assembly; 341. an annular hand wheel; 342. a synchronous connecting rod; 40. a bearing pre-tightening fixing device; 41. a pull rod; 42. a flange plate; 43. pre-tightening the elastic piece; 44. a limiting member; 45. a bearing;

50. a vertical lifting mechanism; 51. a bottom beam; 511. a lower slide rail; 52. swinging arms; 521. an upper slide rail; 53. self-locking universal wheel.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.

The embodiment of the utility model discloses nut installation device 1 for install the heavier mounting nut 2 of treating of weight on fixing the interbedded bolt of low temperature storage tank vacuum. The nut installation device 1 of the cryogenic storage tank in the embodiment includes a supporting mechanism 10, a pretightening force adjusting mechanism 20, and an installation mechanism 30. The supporting mechanism 10 is provided with a nut tray 11 for supporting and fixing the nut 2 to be installed; the pretightening force adjusting mechanism 20 comprises a thrust assembly 21 arranged on the nut tray 11 and a supporting sleeve 22 positioned on the thrust assembly 21; the supporting sleeve 22 is used for supporting the lower surface of the nut 2 to be installed, the thrust component 21 is used for generating upward thrust on the supporting sleeve 22, and the supporting sleeve 22 lifts the nut 2 to be installed under the action of the upward thrust; the mounting mechanism 30 is supported on the lower side of the supporting mechanism 10 and can drive the nut tray 11 to horizontally rotate while ascending, so that when the supporting sleeve 22 lifts the nut 2 to be mounted, the nut tray 11 drives the nut 2 to be mounted to be rotatably mounted on the bolt in the low-temperature storage tank.

The utility model discloses in set up the pretightning force adjustment mechanism 20 of installing on nut tray 11, thrust unit 21 installs on nut tray 11 for produce ascending thrust to supporting cover 22. Because the supporting sleeve 22 is supported below the nut 2 to be installed, the supporting sleeve 22 can generate lifting force on the nut, so that the friction force of a thread contact surface between the nut and the bolt in field installation can be eliminated or reduced, the nut and the bolt are prevented from being seized, and the nut is accurately and quickly installed.

The surface of the nut tray 11 in this embodiment is substantially horizontal and optionally the nut tray 11 is substantially circular to correspond to the shape of the nuts. At least two nut positioning locking columns 111 arranged at intervals are further convexly arranged on the nut tray 11, and the nut positioning locking columns 111 are used for extending into the nut 2 to be installed so as to support against the inner side wall of the nut 2 to be installed. The nut positioning lock posts 111 may be provided in plural, preferably symmetrically with respect to the center of the nut tray 11. The nut positioning locking columns 111 simultaneously abut against the inner side wall of the nut 2 to be installed, and therefore the displacement of the nut in the horizontal direction is limited by the nut positioning locking columns 111.

In this embodiment, the supporting mechanism 10 further includes a self-aligning ball bearing 12, which is used to automatically align the nut and the bolt so that the nut and the bolt are coaxial. The upper end of the self-aligning ball bearing 12 is embedded into the nut tray 11, and the lower end of the self-aligning ball bearing 12 is fixedly connected with the mounting mechanism 30. A self-aligning ball bearing 12 of the prior art can be used in the present embodiment. When the nut is located the upper end of self-aligning ball bearing 12, self-aligning ball bearing 12 can be through driving the skew of nut tray 11 to make and wait to install nut 2 coaxial with the bolt, with further being favorable to the correct installation of nut.

In this embodiment, the pretightening force adjusting mechanisms 20 may be provided in plural and symmetrically arranged corresponding to the center of the nut tray 11 to provide a balanced bearing force for the nut 2 to be installed. The thrust assembly 21 may be formed of a purely mechanical component, or may be formed of an electrically powered, actuating component. For example by providing a cylinder to push the support sleeve 22 with the piston shaft of the cylinder to produce an upward thrust.

In this embodiment, the thrust assembly 21 of the pretightening force adjusting mechanism 20 includes a seat cover 211, a sliding member 212, and an elastic member 213; the seat cover 211 is fixedly arranged on the nut tray 11, the sliding part 212 is movably arranged in the seat cover 211 along the up-down direction, and the upper end of the sliding part 212 is fixedly connected with the support sleeve 22; the elastic member 213 is clamped between the support sleeve 22 and the seat cover 211, and when the mounting mechanism 30 drives the nut tray 11 to move upward, the seat cover 211 moves upward along the sliding member 212 to compress the elastic member 213, so that the elastic member 213 pushes the support sleeve 22 upward.

Specifically, the nut tray 11 has a stepped hole for mounting the seat cover 211, the outer surface of the seat cover 211 is stepped to be fixedly embedded in the stepped hole, and the slider 212 penetrates through the seat cover 211 in the vertical direction and can move in the vertical direction relative to the seat cover 211. Slider 212 has a guiding effect on the sliding of sleeve 211. The elastic member 213 serves to generate an upward elastic force when being pressed.

In one embodiment, the sliding member 212 is a sliding rod with threads at two ends, and the elastic member 213 is a compression spring; a threaded hole extending along the vertical direction is formed in the support sleeve 22, and the upper end of the sliding piece 212 is connected in the threaded hole in a threaded manner; the seat cover 211 is internally provided with a containing groove 2111 with an upward notch, and the sliding part 212 penetrates through the bottom of the containing groove 2111 from top to bottom and protrudes out of the bottom of the seat cover 211; the elastic element 213 is disposed on the sliding rod, and the compression spring is clamped between the bottom of the receiving slot 2111 and the surface of the supporting sleeve 22 facing the receiving slot 2111.

Specifically, the support sleeve 22 is provided with a guide groove 221 extending along the vertical direction, the notch faces the seat cover 211, and the upper end of the seat cover 211 extends into the guide groove 221. The threaded hole penetrates through the bottom of the guide groove 221, the upper end of the sliding member 212 is in threaded connection with the threaded hole to realize fixed connection with the support sleeve 22, the upper end of the sliding member 212 is provided with a boss, and after the upper end of the sliding member 212 is screwed into the support sleeve 22, the boss abuts against the surface around the threaded hole on the support sleeve 22. The support sleeve 22 is reversely buckled on the seat cover 211, and the inner wall surface of the support sleeve 22 is jointed with the outer wall surface of the seat cover 211.

In this embodiment, the thrust assembly 21 further includes a fixing nut 214, and the fixing nut 214 is screwed with the lower end of the sliding member 212. When the seat cover 211 is moved upward, the fixing nut 214 is rotated to move upward to maintain the relative position of the seat cover 211 and the slider 212.

In this embodiment, through the height that utilizes mounting structure adjusting nut tray 11 to adjust the last thrust of elastic component 213 to supporting cover 22 in the thrust subassembly 21, thereby adjust and support cover 22 and treat the lifting force of mounting nut 2, with the nut of the different weight of adaptation, realized the utility model discloses nut installation device 1's convenient to use nature.

When the nut tray 11 moves upward, the seat cover 211 is driven to move upward to further extend into the guide groove 221 of the support sleeve 22. In order to facilitate the installer to quantify the lifting force, in this embodiment, the outer surface of the seat cover 211 is provided with a scale area 215 along the up-down direction, and the scale area 215 includes a plurality of scales, so that the lower edge of the support cover 22 is aligned with one of the scales when the seat cover 211 moves along the up-down direction, and the scale value is associated with the current upward pushing force generated by the elastic member 213. It will be appreciated that the scale values and their corresponding locations marked on the outer surface of the seat cover 211 are set experimentally.

For example, the height of the nut tray 11 is adjusted by the mounting mechanism 30 so that the slide bar adjusts the scale to "0" position, which indicates that there is no lifting force, and when the scale is adjusted to "5N", which indicates that the lifting force is 5N. It will be appreciated that the higher the position, the greater the upward thrust corresponding to the upper scale. The position of a certain scale is indicated by the measured upward pushing force of the elastic member 213, which is required in the experiment.

In this embodiment, the mounting mechanism 30 can be raised while rotating the nut tray 11, so that the nut 2 to be mounted is screwed with the bolt from the lower side of the bolt. Specifically, the mounting mechanism 30 includes a supporting platform 31, a lifting column 32 penetrating the supporting platform 31, a lifting nut 33 fixedly connected with the supporting platform 31, and a connecting assembly 34; the outer wall surface of the lifting column 32 is provided with a thread with the lead consistent with that of the nut 2 to be installed, and the lifting nut 33 is sleeved outside the lifting column 32 so as to drive the lifting column 32 to lift through rotation; the nut tray 11 is linked with the lifting nut 33 through the connecting component 34, so that when the lifting nut 33 rotates, the nut tray 11 is driven to rotate synchronously.

The supporting platform 31 is used for supporting the lifting column 32 and the lifting nut 33. The lifting column 32 may be a solid column or a tube. Since the lifting nut 33 is screw-coupled to the outer side of the lifting column 32, the lifting nut 33 can move up or down with respect to the lifting column 32 when rotated. The lifting nut 33 will thus have a movement state of both turning and up/down. When the lifting nut 33 rotates to move itself upward, since the lifting nut 33 is connected to the nut tray 11 by the connecting member 34, the nut tray 11 also achieves a moving state of rotating and moving upward.

In another embodiment, the inner wall surface of the lifting column 32 is provided with a thread with a lead consistent with that of the nut 2 to be mounted, and the lifting nut 33 is arranged inside the lifting column 32 to drive the lifting column 32 to lift by rotation; the nut tray 11 is linked with the lifting nut 33 through the connecting component 34, so that when the lifting nut 33 rotates, the nut tray 11 is driven to rotate synchronously.

In this embodiment, the connection assembly 34 includes an annular handwheel 341, and a synchronizing link 342; the annular hand wheel 341 includes an annular outer ring and a connecting rod, the annular outer ring is annularly disposed on the outer side of the lifting nut 33 along the circumferential direction of the lifting nut 33, and both ends of the connecting rod are respectively connected to the annular outer ring and the lifting nut 33; the timing link 342 is detachably connected between the annular hand wheel and the nut tray 11.

In the present embodiment, the provision of the synchronization link 342 enables control of the correlation of the movement state between the nut tray 11 and the lifting nut 33. When the synchronous connecting rod 342 is detached, when the lifting nut 33 rotates to lift relative to the lifting column 32, the nut tray 11 only ascends synchronously and does not rotate simultaneously with the lifting nut 33, and the height of the nut tray 11 can be adjusted based on the connecting structure, so that the lifting force generated by the pretightening force adjusting mechanism 20 can be adjusted. When the synchronous link 342 is removed, when the lifting nut 33 is rotated to be lifted with respect to the lifting column 32, the nut tray 11 is not only lifted synchronously but also rotated simultaneously with the lifting nut 33, so that the nut 2 to be mounted can be mounted on the bolt.

The mode that synchronous connecting rod 342 can dismantle to be connected between annular hand wheel and nut tray 11 has the multiple, for example, synchronous connecting rod 342 both ends have the screw thread, can have seted up a plurality of mounting holes on the connecting rod of annular hand wheel, and the correspondence has seted up a plurality of connecting holes on nut tray 11, and synchronous connecting rod 342 can pass the mounting hole simultaneously to and the connecting hole that corresponds with this mounting hole, the both ends of synchronous connecting rod 342 of rethread nut locking. In another embodiment, the annular hand wheel can be detachably connected between the annular hand wheel and the nut tray 11 through a clamping structure.

Further, in order to achieve the working stability of the nut mounting device 1, in this embodiment, the nut mounting device 1 further includes a bearing pre-tightening fixing device 40. The bearing pre-tightening fixing device 40 is used for locking the relative positions of the nut tray 11, the self-aligning ball bearing 12 and the lifting column 32. Specifically, the bearing pre-tightening fixing device 40 includes a pull rod 41, a flange plate 42, a pre-tightening elastic member 43, a limiting member 44, and a bearing 45; the lifting column 32 is cylindrical, a clamping part 321 is convexly arranged on the inner wall surface of the lifting column 32, and the flange plate 42 is horizontally arranged in the lifting column 32 and is positioned at the lower side of the clamping part 321; the pull rod 41 comprises a rod part and a baffle positioned at the upper end of the rod part, and the rod part sequentially penetrates through the nut tray 11, the self-aligning ball bearing 12 and the flange plate 42; the rod part is connected with the flange plate through a bearing. The baffle abuts against the top surface of the nut tray 11, and the limiting piece 44 is fixedly connected with the lower end of the rod part; the elastic member 213 is disposed between the flange plate 42 and the limiting member 44, so that when the elastic member 213 is compressed, the flange plate 42 abuts against the retaining portion 321, so as to provide a clamping force between the nut tray 11, the self-aligning ball bearing 12, and the lifting column 32. The bearing 45 is used for preventing the pull rod 41 from synchronously rotating along with the flange plate 42 when the flange plate 42 is driven to rotate by the lifting column, so that the flange plate 42 and the pull rod 41 are connected and simultaneously a relatively independent working state is kept.

Therefore, through the arrangement of the bearing pre-tightening fixing device 40, when the self-aligning ball bearing 12 aligns the position of the nut 2 to be installed, even if the nut tray 11 deviates, the stability of the relative positions among the nut tray 11, the self-aligning ball bearing 12 and the lifting column 32 can be effectively ensured; the situation that the nut tray 11, the self-aligning ball bearing 12 and the lifting column 32 are not collinear and are displaced when the nut tray 11 is offset is effectively prevented.

Specifically, the upper end of the self-aligning ball bearing 12 is embedded in the nut tray 11, and the lower end of the self-aligning ball bearing 12 is disposed at the upper end of the lifting column 32. The inner edge of the upper end of the lifting column 32 has a recessed mounting location into which the lower end of the self-aligning ball bearing 12 falls. The pull rod 41 can be approximately T-shaped, and the pre-tightening elastic piece 43 can be a compression spring sleeved on the pull rod 41; the stopper 44 may be a nut, and the lower end of the pull rod 41 may have a screw thread.

Further, the nut installation device 1 of the embodiment of the present invention further includes a vertical lifting mechanism 50, wherein the vertical lifting mechanism 50 is supported below the supporting platform 31 to drive the installation mechanism 30 and the supporting mechanism 10 to move vertically. Therefore, the vertical distance between the nut 2 to be installed and the bolt can be adjusted more quickly and conveniently.

Specifically, two upper side slide rails 521 are arranged on the supporting platform 31 at intervals, the vertical lifting mechanism 50 comprises a bottom beam 51 and two swing arms 52, the bottom beam 51 is provided with lower side slide rails 511 which are respectively in one-to-one correspondence with the two upper side slide rails 521 at intervals, the two swing arms 52 are arranged in a crossed manner, the middle parts of the two swing arms 52 are movably connected through a rotating shaft, and two ends of each swing arm 52 are respectively correspondingly movably connected with one upper side slide rail 521 and one lower side slide rail 511; the mounting mechanism 30 and the supporting mechanism 10 are driven to move vertically by adjusting the included angle between the two swing arms 52. It will be appreciated that the upper slide rail 521 and the lower slide rail 511 both extend in a horizontal direction.

In a specific embodiment, a first connecting member extending downward is disposed in the upper slide rail 521, the first connecting member can move along the upper slide rail 521, and the first connecting member is rotatably connected to the upper end of the swing arm 52. Of course, a second connecting member extending upward is provided in the lower side slide rail 511, the second connecting member can move along the lower side slide rail 511, and the second connecting member is rotatably connected to the lower end of the swing arm 52.

Further, for the convenience of fixing the nut mounting device 1 at the adjustment completion position, in the present embodiment, a plurality of self-locking universal wheels 53 are further provided on the lower side of the base beam 51.

The specific operation of the nut mounting apparatus 1 of the present embodiment will be described.

Fixedly placing the nut 2 to be installed on the nut tray 11, and locking the nut 2 to be installed by using the nut positioning lock column 111 on the nut tray 11; the self-locking universal wheel 53 on the nut mounting device 1 is moved to the lower part of the bolt; then the nut 2 to be installed is adjusted to be approximately lifted to the end face of the lower side of the bolt through the included angle of the swing arm 52 in the vertical lifting mechanism 50; the self-aligning ball bearing 12 is used for realizing the automatic alignment of the nut 2 to be installed and the bolt, so that the nut 2 to be installed and the bolt are coaxial; then the annular hand wheel 341 is rotated, at this time, the lifting nut 33 is driven to rotate by rotating the annular hand wheel 341, so that the nut tray 11 is lifted, and the nut 2 to be installed is slowly screwed into the bolt. When the self-locking universal wheel 53 is screwed in for 1-2 circles, the self-locking universal wheel is locked, and shaking is prevented. Observing the pretightening force scale on the pretightening force adjusting mechanism 20 to adjust the lifting force of the pretightening force adjusting mechanism 20 on the nut 2 to be installed, for example, to 5N; after the pretightening force adjusting mechanism 20 finishes adjusting, the lifting force of the nut 2 to be installed is kept unchanged, the synchronous connecting rod 342 is connected between the annular hand wheel and the nut tray 11, and the nut 2 to be installed can be directly installed in place by slowly rotating the annular hand wheel.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A nut mounting apparatus comprising:

the bearing mechanism is provided with a nut tray for bearing and fixing the nut to be installed;

the pretightening force adjusting mechanism comprises a thrust component arranged on the nut tray and a supporting sleeve positioned on the thrust component; the support sleeve is used for supporting the lower surface of the nut to be installed, the thrust assembly is used for generating an upper thrust to the support sleeve, and the support sleeve is used for lifting the nut to be installed under the action of the upper thrust;

the mounting mechanism is supported on the lower side of the bearing mechanism and can drive the nut tray to horizontally rotate while ascending, so that the support sleeve lifts to treat the mounting nut, and the nut tray drives the to-be-mounted nut to be rotatably mounted on the bolt in the low-temperature storage tank.

2. The nut mounting apparatus of claim 1 wherein said thrust assembly comprises a sleeve, a slide, a resilient member;

the seat sleeve is fixedly arranged on the nut tray, the sliding piece is movably arranged in the seat sleeve in a penetrating manner along the vertical direction, and the upper end of the sliding piece is fixedly connected with the supporting sleeve;

the elastic piece is clamped between the support sleeve and the seat sleeve, and when the mounting mechanism drives the nut tray to move upwards, the seat sleeve moves upwards along the sliding piece to compress the elastic piece, so that the elastic piece generates an upward thrust on the support sleeve.

3. The nut mounting apparatus of claim 2 wherein said sliding member is a sliding rod having threads at both ends, said elastic member is a compression spring, and said thrust assembly further comprises a fixing nut;

the supporting sleeve is provided with a threaded hole extending along the vertical direction, and the upper end of the sliding piece is in threaded connection with the threaded hole;

the seat sleeve is internally provided with an accommodating groove with an upward notch, and the sliding piece penetrates through the bottom of the accommodating groove from top to bottom and protrudes out of the bottom of the seat sleeve; the fixed nut is in threaded connection with the lower end of the sliding part,

the elastic piece is sleeved on the sliding rod, and the compression spring is clamped between the bottom of the accommodating groove and the surface, facing the accommodating groove, of the support sleeve.

4. The nut mounting device according to claim 2, wherein the support sleeve is provided with a guide groove extending in an up-down direction, a notch faces the seat sleeve, and an upper end of the seat sleeve extends into the guide groove;

the outer surface of the seat cover is distributed with a plurality of scales along the up-down direction, the seat cover moves along the up-down direction, so that the lower edge of the supporting cover is aligned to one of the scales, and the scale value is related to the up-pushing force generated by the elastic piece at present.

5. The nut mounting device according to claim 1, wherein the mounting mechanism comprises a supporting platform, a lifting column arranged in the supporting platform in a penetrating way, a lifting nut fixedly connected with the supporting platform, and a connecting assembly;

the outer wall surface of the lifting column is provided with threads with the lead consistent with that of a nut to be mounted, and the lifting nut is sleeved on the outer side of the lifting column to rotationally drive the lifting column to lift;

the nut tray is connected with the lifting nut in a linkage mode through the connecting assembly, so that when the lifting nut rotates, the nut tray is driven to rotate synchronously.

6. The nut mounting apparatus of claim 5 wherein the connection assembly comprises an annular hand wheel, and a synchronizing link;

the annular hand wheel comprises an annular outer ring and a connecting rod, the annular outer ring is arranged on the outer side of the lifting nut in a surrounding mode along the circumferential direction of the lifting nut, and two ends of the connecting rod are connected to the annular outer ring and the lifting nut respectively;

the synchronous connecting rod is detachably connected between the annular hand wheel and the nut tray.

7. The nut mounting apparatus of claim 5 wherein the support mechanism further comprises a self-aligning ball bearing, an upper end of the self-aligning ball bearing being embedded in the nut tray, a lower end of the self-aligning ball bearing being disposed at an upper end of the lifting column.

8. The nut mounting device of claim 7 further comprising a bearing pre-tightening fixture, wherein the bearing pre-tightening fixture comprises a pull rod, a flange plate, a pre-tightening elastic member, a limiting member, and a bearing;

the lifting column is cylindrical, a clamping part is arranged on the inner wall surface of the lifting column in a protruding mode, and the flange plate is arranged in the lifting column in a flat mode and located on the lower side of the clamping part;

the pull rod comprises a rod part and a baffle positioned at the upper end of the rod part, and the rod part sequentially penetrates through the nut tray, the self-aligning ball bearing and the flange plate; the baffle abuts against the top surface of the nut tray, and the limiting piece is fixedly connected with the lower end of the rod part; the rod part is connected with the flange plate through a bearing;

the elastic piece is arranged between the flange plate and the limiting piece, so that when the elastic piece is compressed, the flange plate is abutted against the clamping part, and clamping force is provided among the nut tray, the self-aligning ball bearing and the lifting column.

9. The nut mounting device according to claim 1, wherein at least two nut positioning locking columns are protruded from the nut tray and arranged at intervals, and the nut positioning locking columns are used for extending into the nut to be mounted so as to support against the inner side wall of the nut to be mounted.

10. The nut mounting apparatus of claim 5 further comprising a vertical lift mechanism supported below the support platform for driving vertical movement of the mounting mechanism and the racking mechanism.

11. The nut mounting apparatus of claim 10 wherein the support platform has two upper side rails spaced apart,

the vertical lifting mechanism comprises a bottom beam and two swing arms, wherein the bottom beam is provided with lower side slide rails which are respectively in one-to-one correspondence with the two upper side slide rails at intervals, the two swing arms are arranged in a crossed manner, the middle parts of the two swing arms are movably connected through a rotating shaft, and two ends of each swing arm are respectively correspondingly movably connected with one upper side slide rail and one lower side slide rail; through adjusting two contained angle between the swing arm to the drive installation mechanism, bearing mechanism vertical motion.