CN212533701U - Lower-limiting movable spherical support of bridge - Google Patents

Abstract

The embodiment of the application provides a lower spacing activity ball-type support of bridge, includes: the upper seat plate, the lower seat plate, the spherical crown and the two limit adjusting devices; the spherical crown is arranged between the upper seat plate and the lower seat plate and is connected with the upper seat plate and the lower seat plate in a sliding way; the two limiting adjusting devices are arranged on the lower seat plate and are positioned on two sides of the spherical crown along the longitudinal direction of the lower limiting movable spherical support; the limiting adjusting devices can longitudinally adjust the distance between the two limiting adjusting devices along the lower limiting movable spherical support to limit the maximum sliding distance of the upper seat plate relative to the lower seat plate along the longitudinal direction of the lower limiting movable spherical support. After the lower limiting movable spherical support is arranged on the bridge, the steel rail telescopic regulator can be reduced, so that the adverse effect of the existence of the steel rail telescopic regulator on the construction of the high-speed railway bridge can be reduced, the construction cost of the bridge is reduced, and the design and construction difficulty of the bridge is also reduced.

Description

Lower-limiting movable spherical support of bridge

Technical Field

The utility model relates to a bridge beam supports technical field, in particular to spacing activity ball-type support down of bridge.

Background

Along with the construction of high-speed railway engineering in China, more and more bridges cross rivers, rivers and various roads, particularly in southern areas in China, roads and water systems are developed, and more medium-span and large-span continuous beam bridges are provided. For some high-speed railway long-span bridges, because the temperature span is large, after the common longitudinal constraint system is adopted, a large number of steel rail expansion adjusters are also required to be arranged at the beam ends so as to reduce the relative displacement between the steel rails and the bridge.

However, the more steel rail telescopic adjusters are arranged, so that the smoothness of the track structure and the travelling comfort are affected, and the maintenance workload is large. Meanwhile, the rail expansion adjuster is usually required to be arranged on a straight line section, which not only brings great difficulty to route selection and bridge design of the high-speed railway, but also severely limits the span of the high-speed railway bridge.

SUMMERY OF THE UTILITY MODEL

In view of this, an embodiment of the present invention mainly aims to provide a lower-limiting movable spherical bearing for a bridge, so as to solve the problem in the related art that the installation of a large number of rail expansion adjusters may adversely affect the construction of a high-speed railway bridge. In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

the embodiment of the application provides a lower spacing activity ball-type support of bridge, includes:

an upper seat plate;

a lower seat plate;

the spherical crown is arranged between the upper seat plate and the lower seat plate, one side of the spherical crown is in sliding connection with the upper seat plate, and one side of the spherical crown, which is far away from the upper seat plate, is in sliding connection with the lower seat plate;

the two limiting adjusting devices are arranged on the lower base plate, and are positioned on two sides of the spherical crown along the longitudinal direction of the lower limiting movable spherical support; the limiting adjusting devices can longitudinally adjust the distance between the two limiting adjusting devices along the lower limiting movable spherical support so as to limit the maximum sliding distance of the upper seat plate relative to the lower seat plate along the longitudinal direction of the lower limiting movable spherical support.

Further, the limit adjusting device comprises a first limit plate, a force transmission plate and an adjusting gasket;

the first limiting plate is fixedly connected with the lower seat plate;

the force transmission plate is arranged on one side, close to the spherical crown, of the first limiting plate and can move relative to the first limiting plate along the longitudinal direction of the lower limiting movable spherical support;

the adjusting gasket is selectively clamped between the first limiting plate and the force transmission plate.

Furthermore, the limiting and adjusting device further comprises a first adjusting bolt and an adjusting nut, a first through hole is formed in the force transmission plate, and a second through hole is formed in the first limiting plate;

the first adjusting bolt comprises a first rod part and a first head part arranged at one end of the first rod part, the first rod part penetrates through the first through hole and the second through hole, and the first head part is abutted to the dowel plate;

the adjusting gasket clamped between the first limiting plate and the dowel plate penetrates through the first rod part;

the adjusting nut is arranged on one side, far away from the dowel plate, of the first limiting plate and is in threaded connection with the first rod part.

Further, a locking groove is formed in the adjusting gasket, and one end of the locking groove extends to the edge of the adjusting gasket to form an opening at the edge of the adjusting gasket;

the first rod part is clamped into the locking groove through the opening, so that the adjusting gasket is arranged on the first rod part in a penetrating mode.

Furthermore, the number of the adjusting gaskets is multiple, and the thicknesses of at least two of the adjusting gaskets are different.

Further, the limiting and adjusting device comprises a first limiting plate, a second adjusting bolt and a plurality of adjusting blocks with different thicknesses;

the first limiting plate is fixedly connected with the lower seat plate;

the second adjusting bolt comprises a second rod part and a second head part arranged at one end of the second rod part, the second rod part penetrates through the first limiting plate and is in threaded connection with the first limiting plate, and the second head part is positioned on one side, far away from the spherical crown, of the first limiting plate;

one end of the second rod part far away from the second head part is selectively connected with one of the adjusting blocks in a threaded mode.

Furthermore, one side of the spherical crown, which is in sliding connection with the upper seat plate, is a spherical surface, and one side of the spherical crown, which is far away from the upper seat plate, is a plane.

Furthermore, the lower limiting movable spherical support also comprises a middle seat plate with a sliding groove;

the middle seat plate is arranged between the two limiting and adjusting devices and is in sliding connection with the lower seat plate, and the sliding groove is positioned on one side, far away from the lower seat plate, of the middle seat plate;

the spherical crown is arranged in the sliding groove and is in sliding connection with the middle seat plate;

one side of the upper seat plate, which is in sliding connection with the spherical crown, extends into the sliding groove.

Further, when the upper seat plate slides to a limit position relative to the lower seat plate along the longitudinal direction of the lower limit movable ball-type support, the middle seat plate is abutted to the corresponding force transmission plate.

Further, the lower limiting movable spherical support also comprises two second limiting plates arranged on the lower seat plate;

and the two second limiting plates are arranged on two sides of the middle seat plate along the transverse direction of the lower limiting movable spherical support and are in clearance fit with the middle seat plate so as to prevent the upper seat plate from sliding transversely along the lower limiting movable spherical support.

The embodiment of the application provides a lower limiting movable spherical support, and through setting up two limiting adjusting devices on the bedplate down, both can maintain the stability of bridge restraint system, can guarantee again that the girder can be free deformation under the temperature effect, makes this lower limiting movable spherical support can satisfy the slip and the spacing requirement of bridge construction under the condition that different temperature shrink creep from this. After the lower limiting movable spherical support is arranged on the bridge, the number of the steel rail telescopic regulators can be reduced, so that the adverse effect of the steel rail telescopic regulators on the construction of the high-speed railway bridge can be reduced, the construction cost of the bridge is reduced, the design and construction difficulty of the bridge is also reduced, the lower limiting movable spherical support can meet the construction requirements of the high-speed railway bridge, particularly the large-span bridge of the high-speed railway, and the construction requirements of a curved bridge can also be met.

Drawings

FIG. 1 is a half sectional view of a lower-limit movable ball-type support according to an embodiment of the present disclosure;

FIG. 2 is a half sectional view of the lower-limit live ball bearing shown in FIG. 1 from another perspective;

FIG. 3 is a schematic view of the adjusting shim shown in FIG. 1;

FIG. 4 is a half sectional view of a lower-limit live ball bearing according to another embodiment of the present application;

fig. 5 is a half sectional view of a lower-limit movable ball-type seat according to still another embodiment of the present application.

Reference numerals:

an upper seat plate 10; a lower seat plate 20; a spherical cap 30; a limit adjusting device 40; a first limit plate 41; a force transmission plate 42; an adjusting shim 43; the lock groove 43 a; an opening 43 b; a first adjusting bolt 44; a first head 441; the first rod portion 442; an adjusting nut 45; a second adjusting bolt 46; a second head 461; the second rod portion 462; an adjusting block 47; a middle seat plate 50; a chute 50 a; a second restriction plate 60; sliding friction pair 70.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

In the description of the present application, the "longitudinal" orientation or positional relationship is based on FIG. 1, and the "lateral" orientation or positional relationship is based on the orientation or positional relationship shown in FIG. 2, it being understood that these orientation terms are merely for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present application.

An embodiment of the present application provides a lower-limiting movable spherical bearing of a bridge, please refer to fig. 1, the lower-limiting movable spherical bearing includes: the upper seat plate 10, the lower seat plate 20, the spherical cap 30 and two limit adjusting devices 40. The spherical cap 30 is arranged between the upper seat plate 10 and the lower seat plate 20, one side of the spherical cap 30 is connected with the upper seat plate 10 in a sliding way, and one side of the spherical cap 30 far away from the upper seat plate 10 is connected with the lower seat plate 20 in a sliding way. The two limit adjusting devices 40 are arranged on the lower seat plate 20, and the two limit adjusting devices 40 are positioned at two sides of the spherical crown 30 along the longitudinal direction of the lower limit movable spherical support. The limit adjusting devices 40 can adjust the distance between the two limit adjusting devices 40 along the longitudinal direction of the lower limit movable ball-type support to limit the maximum sliding distance of the upper seat plate 10 relative to the lower seat plate 20 along the longitudinal direction of the lower limit movable ball-type support.

Specifically, the lower-limit movable spherical bearing of the present embodiment is mainly disposed between a main girder and a pier of a bridge, wherein the lower seat plate 20 is fixedly connected to the pier, and the upper seat plate 10 is fixedly connected to the main girder. In practical application, the lower-limit movable spherical support of the embodiment can be arranged between the main beam and the main pier, a conventional movable support is arranged between the main beam and other piers except the main pier, or the lower-limit movable spherical support of the embodiment can be arranged between the main beam and all piers.

Referring to fig. 1, the lower-limiting movable ball-shaped seat of the present embodiment further includes a middle seat plate 50 having a sliding groove 50 a. The middle seat plate 50 is disposed between the two limit adjusting devices 40 and is slidably connected to the lower seat plate 20, and the sliding groove 50a is located on a side of the middle seat plate 50 away from the lower seat plate 20. The spherical cap 30 is disposed in the sliding groove 50a and slidably coupled with the middle seat plate 50. The side of the upper seat plate 10 slidably connected to the spherical cap 30 is inserted into the sliding groove 50 a. That is to say, the lower limiting movable spherical bearing of this embodiment has set up three bedplate therein, three bedplate can make the atress of lower limiting movable spherical bearing more even, and spherical crown 30 is through well bedplate 50 and lower bedplate 20 sliding connection in fact, furthermore, in this embodiment, one side that spherical crown 30 and upper seat board 10 sliding connection are the sphere, one side that spherical crown 30 kept away from upper seat board 10 is the plane, be the sphere slip between upper seat board 10 and the spherical crown 30 promptly, be the plane slip between spherical crown 30 and the lower bedplate 20, the benefit of this kind of setting mode lies in, under the circumstances that lower limiting movable spherical bearing takes place to rotate, lower limiting movable spherical bearing still can even transmission horizontal load. In order to reduce the friction loss in the sliding process, sliding friction pairs 70 are respectively arranged between the lower seat plate 20 and the middle seat plate 50, between the middle seat plate 50 and the spherical crown 30, and between the spherical crown 30 and the upper seat plate 10, the sliding friction pairs 70 may be a combination of wear-resistant plates and steel plates, the wear-resistant plates may be polyethylene plates, polytetrafluoroethylene plates, and the like, and the steel plates may be stainless steel plates.

It is understood that in other embodiments, the side of the spherical cap 30 slidably connected to the upper seat plate 10 may be a plane, and the side of the spherical cap 30 away from the upper seat plate 10 may be a spherical surface. The lower limiting movable spherical support can only have two seat plates of the upper seat plate 10 and the lower seat plate 20 without the middle seat plate 50, when only the upper seat plate 10 and the lower seat plate 20 are arranged, one side of the spherical crown 30, which is far away from the upper seat plate 10, can be directly connected with the lower seat plate 20 in a sliding manner, and a friction pair can also be arranged between the spherical crown 30 and the lower seat plate 20 in a sliding manner.

In this embodiment, the longitudinal direction of the lower-limit movable spherical bearing corresponds to the bridge direction of the bridge, the transverse direction of the lower-limit movable spherical bearing corresponds to the transverse direction of the bridge, that is, the longitudinal direction of the lower-limit movable spherical bearing installed between the girder and the pier is parallel to the bridge direction of the bridge, the transverse direction of the lower-limit movable spherical bearing is parallel to the transverse direction of the bridge, and the limit adjusting devices 40 actually adjust the distance between the two limit adjusting devices 40 along the bridge direction of the bridge.

The limiting adjustment device 40 of the embodiment is disposed on the lower seat plate 20, that is, the limiting adjustment device 40 is located at the lower part of the lower limiting movable spherical support, and in practical applications, the limiting adjustment device 40 can determine the specific adjustment amount of the limiting adjustment device 40 according to the slippage and limiting requirements of the bridge under different temperature shrinkage creep.

In the related technology, when the temperature span of the high-speed railway concrete beam is greater than 200m and the temperature span of the steel beam is greater than 100m, a large number of steel rail telescopic regulators are needed according to the requirement of the stress of the rail, so that the displacement difference between the long and large bridge beam end telescopic displacement and the long steel rail telescopic displacement caused by the temperature is coordinated through the steel rail telescopic regulators, the temperature force of the long steel rail on the bridge can be automatically adjusted, and the load borne by the rail and the bridge is reduced. However, the rail expansion adjuster is high in cost and difficult to design and construct, and generally needs to be arranged in a straight section of a track, so that the arrangement of a large number of rail expansion adjusters not only increases the construction cost of a bridge and brings great difficulty to line selection and bridge design of a high-speed railway, but also severely limits the span of the high-speed railway bridge. In addition, the rail telescopic regulator is arranged on the rail, so that the problem of unsmooth structure between the switch rail and the stock rail is solved, and when a train runs to the switch rail at a high speed, large impact force is generated, and the running quality of the train is further influenced.

The distance between the two limit adjusting devices 40 can be adjusted by the limit adjusting device 40 on the lower limit movable spherical bearing of the embodiment according to the slippage and limit requirements of the bridge under different temperature shrinkage creep so as to limit the maximum sliding distance of the upper seat plate 10 relative to the lower seat plate 20 along the bridge direction, therefore, under the normal operation condition of the bridge, the lower limit movable spherical bearing can not only utilize the self frictional resistance to bear the braking force of the high-speed railway, the acting force of the long rail and the wind power so as to resist the main beam movement under the actions of the braking force of the high-speed railway, the acting force of the long rail and the wind power so as to maintain the stability of the bridge restraint system, but also can ensure that the main beam can freely deform under the action of the temperature, so that the lower limit movable spherical bearing can meet the slippage and limit requirements of the bridge structure under different temperature shrinkage creep conditions, after the lower limit movable spherical bearing of the embodiment is installed on the main pier of, the fixed support does not need to be installed on the bridge, namely, after the original fixed support is replaced by the lower limiting movable spherical support of the embodiment, the original common longitudinal constraint system is changed into a new cooperative constraint system, the cooperative constraint system can meet the sliding and limiting requirements of a bridge structure under the creep condition of different temperature shrinkage, and then the bridge provided with the lower limiting movable spherical support of the embodiment can reduce the use of a steel rail telescopic regulator, the construction cost of the bridge is reduced, the bridge design and the construction difficulty are reduced, the construction requirements of high-speed railway bridges, particularly large-span bridges of the high-speed railway can be met, and the construction requirements of curved bridges can be met. In addition, after the number of the steel rail telescopic regulators is reduced, the problem of structural irregularity between the switch rail and the stock rail can be eliminated to a certain extent, and therefore the train can be guaranteed to run more stably.

The lower-limiting movable spherical support of the embodiment changes the situation that a large number of steel rail telescopic regulators are required to be arranged in the conventional continuous system beam bridge, and can be popularized and applied to continuous system beam bridges such as concrete continuous beams, partial cable-stayed bridges, continuous beam arch bridges and the like.

Referring to fig. 1, the limiting adjustment device 40 of the present embodiment includes a first limiting plate 41, a force transmission plate 42 and an adjusting washer 43. The first limiting plate 41 is fixedly connected with the lower seat plate 20. The force transmission plate 42 is arranged on one side of the first limit plate 41 close to the spherical crown 30 and can move relative to the first limit plate 41 along the longitudinal direction of the lower limit movable spherical support. The adjuster shim 43 is selectively interposed between the first stopper plate 41 and the force transmission plate 42.

Specifically, the upper seat plate 10 is movable in two opposite directions in the longitudinal direction of the lower check ball type seat, and the middle seat plate 50 abuts against the corresponding force transmission plate 42 when the upper seat plate 1O is slid to a limit position with respect to the lower seat plate 20 in the longitudinal direction of the lower check ball type seat. That is, when the upper seat plate 10 moves to the limit position in one direction along the longitudinal direction of the lower limit movable ball type support, the middle seat plate 50 abuts against the force transmission plate 42 on one limit adjusting device 40, and when the upper seat plate 10 moves to the limit position in the other direction along the longitudinal direction of the lower limit movable ball type support, the middle seat plate 50 abuts against the force transmission plate 42 on the other limit adjusting device 40, thereby enabling the two limit adjusting devices 40 to limit the maximum sliding distance of the upper seat plate 10 relative to the lower seat plate 20 along the longitudinal direction of the lower limit movable ball type support. In the present embodiment, the force transmission plate 42 is a flat plate structure, that is, the end surface of the side of the force transmission plate 42 facing the middle seat plate 50 is a plane, and the end surface of the side of the middle seat plate 50 facing the force transmission plate 42 is also a plane, so as to determine the adjustment amount of the limit adjusting device 40, as shown in fig. 1, in practical application, the gap size L between the middle seat plate 50 and the force transmission plate 42 can be determined according to the slippage and limit requirements of the bridge under different temperature shrinkage creep, and the distance between the two limit adjusting devices 40 can be ensured to meet the requirements by adjusting the gap size L between the middle seat plate 50 and the force transmission plate 42.

It is understood that, in other embodiments, when the middle seat plate 50 is not provided in the lower-limit movable ball-type seat, the upper seat plate 10 slides to the limit position relative to the lower seat plate 20 along the longitudinal direction of the lower-limit movable ball-type seat, the lower seat plate 20 may also abut against the corresponding force transmission plate 42, and the spherical cap 30 may also abut against the corresponding force transmission plate 42.

Further, in the present embodiment, the number of the adjusting shims 43 is plural, and at least two of the adjusting shims 43 have different thicknesses, and in practical applications, after the required gap size L between the middle seat plate 50 and the force transmission plate 42 is determined according to the slippage and limiting requirements of the bridge under different temperature shrinkage creep, the gap size L can be made to meet the requirements by combining the adjusting shims 43 with different numbers and/or different thicknesses. The selective interposition of the adjustment shim 43 between the first stopper plate 41 and the force transmission plate 42 means that one or more adjustment shims 43 may be interposed between the first stopper plate 41 and the force transmission plate 42, or the adjustment shims 43 may not be interposed, depending on the adjustment amount actually required, and in other embodiments, only one adjustment shim 43 of one thickness may be provided.

Referring to fig. 1, the limiting adjustment device 40 of the present embodiment further includes a first adjustment bolt 44 and an adjustment nut 45, wherein a first through hole is disposed on the force transmission plate 42, and a second through hole is disposed on the first limiting plate 41. The first adjusting bolt 44 includes a first rod portion 442 and a first head portion 441 provided at one end of the first rod portion 442, the first rod portion 442 passes through the first through hole and the second through hole, and the first head portion 441 abuts against the force transmission plate 42. The adjustment washer 43 interposed between the first stopper plate 41 and the force transmission plate 42 is inserted into the first rod 442. The adjusting nut 45 is disposed on a side of the first stopper plate 41 away from the force transmission plate 42, and is screwed with the first rod 442. When the gap size L between the middle seat plate 50 and the force transmission plate 42 needs to be adjusted, the adjusting nut 45 only needs to be unscrewed, then the corresponding adjusting gasket 43 is detached or mounted according to the actually required adjustment amount, and then the adjusting nut 45 is screwed.

Further, referring to fig. 1 and 3, the adjusting shim 43 of the present embodiment is provided with a locking groove 43a, and one end of the locking groove 43a extends to an edge of the adjusting shim 43 to form an opening 43b at the edge of the adjusting shim 43. When the adjusting shim 43 is installed, the first rod portion 442 can be clamped into the locking groove 43a through the opening 43b, so that the adjusting shim 43 is arranged on the first rod portion 442 in a penetrating mode, when the adjusting shim 43 needs to be detached, the adjusting shim 43 can be moved, the first rod portion 442 can be moved out of the locking groove 43a from the opening 43b, and therefore the adjusting shim 43 can be conveniently detached.

It should be noted that the matching manner of the first limiting plate 41, the force transmission plate 42 and the adjusting washer 43 is not limited to the above, for example, in other embodiments, a guide groove may be provided on the lower seat plate 20 along the longitudinal direction of the lower limiting movable ball-type seat, one end of the force transmission plate 42 close to the lower seat plate 20 is provided in the guide groove, so that the force transmission plate 42 can slide in the guide groove, and the adjusting washer 43 is directly clamped between the first limiting plate 41 and the force transmission plate 42.

Similarly, the limit adjusting device 40 is not limited to the combination of the first limit plate 41, the force transmission plate 42 and the adjusting washer 43, for example, referring to fig. 5, in another embodiment, the limit adjusting device 40 may include: a first stopper plate 41, a second adjusting bolt 46, and a plurality of adjusting blocks 47 having different thicknesses from each other. The first limiting plate 41 is fixedly connected with the lower seat plate 20. The second adjusting bolt 46 includes a second rod part 462 and a second head part 461 disposed at one end of the second rod part 462, the second rod part 462 passes through the first limiting plate 41 and is in threaded connection with the first limiting plate 41, and the second head part 461 is located at one side of the first limiting plate 41 away from the spherical cap 30. An end of the second stem portion 462 remote from the second head portion 461 is selectively threadably coupled to one of the plurality of adjustment blocks 47. When the distance between the two limiting and adjusting devices 40 needs to be adjusted, only the second adjusting bolt 46 needs to be loosened, and then the adjusting block 47 corresponding to the thickness is replaced according to the actual required adjustment amount.

Referring to fig. 2, the lower limiting movable ball-shaped support of the present embodiment further includes two second limiting plates 60 disposed on the lower seat plate 20. Along the horizontal direction of the lower-limiting movable spherical support, two second limiting plates 60 are arranged at two sides of the middle seat plate 50 and are in clearance fit with the middle seat plate 50 to prevent the upper seat plate 10 from sliding along the horizontal direction of the lower-limiting movable spherical support. That is, only a small rotation gap is provided between the two second limiting plates 60 and the middle seat plate 50 of the lower limiting movable spherical bearing of the present embodiment, when the lower limiting movable spherical bearing is installed on a bridge, the upper seat plate 10 can slide along the bridge direction and cannot slide along the transverse bridge direction, that is, the anti-seismic lower limiting movable spherical bearing of the present embodiment is a one-way anti-seismic lower limiting movable spherical bearing which can only slide along the bridge direction.

Referring to fig. 4, in another embodiment, the second position-limiting plate 60 may not be disposed on the lower seat plate 20, that is, the upper seat plate 10 may slide along the forward bridge direction or the transverse bridge direction, that is, the anti-seismic lower-position-limiting movable ball bearing is a bidirectional lower-position-limiting movable ball bearing capable of sliding along the forward bridge direction and the transverse bridge direction. It should be noted that, in practical application, two lower-limiting movable spherical bearings may be arranged on each pier along the transverse bridge direction, one is a unidirectional lower-limiting movable spherical bearing, and the other is a bidirectional lower-limiting movable spherical bearing.

It is understood that in other embodiments, the second retainer plate 60 may also be clearance-fitted with the upper seat plate 1O. In other embodiments, the second position limiting plate 60 may be disposed on the upper seat plate 10, and the second position limiting plate 60 disposed on the upper seat plate 10 may be in clearance fit with the lower seat plate 20 or in clearance fit with the middle seat plate 50.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The utility model provides a lower spacing activity ball-type support of bridge which characterized in that includes:

an upper seat plate;

a lower seat plate;

the spherical crown is arranged between the upper seat plate and the lower seat plate, one side of the spherical crown is in sliding connection with the upper seat plate, and one side of the spherical crown, which is far away from the upper seat plate, is in sliding connection with the lower seat plate;

the two limiting adjusting devices are arranged on the lower base plate, and are positioned on two sides of the spherical crown along the longitudinal direction of the lower limiting movable spherical support; the limiting adjusting devices can longitudinally adjust the distance between the two limiting adjusting devices along the lower limiting movable spherical support so as to limit the maximum sliding distance of the upper seat plate relative to the lower seat plate along the longitudinal direction of the lower limiting movable spherical support.

2. The lower-limiting movable spherical support according to claim 1, wherein the limiting adjustment device comprises a first limiting plate, a force transmission plate and an adjusting gasket;

the first limiting plate is fixedly connected with the lower seat plate;

the force transmission plate is arranged on one side, close to the spherical crown, of the first limiting plate and can move relative to the first limiting plate along the longitudinal direction of the lower limiting movable spherical support;

the adjusting gasket is selectively clamped between the first limiting plate and the force transmission plate.

3. The lower-limiting movable spherical support according to claim 2, wherein the limiting adjustment device further comprises a first adjustment bolt and an adjustment nut, the force transmission plate is provided with a first through hole, and the first limiting plate is provided with a second through hole;

the first adjusting bolt comprises a first rod part and a first head part arranged at one end of the first rod part, the first rod part penetrates through the first through hole and the second through hole, and the first head part is abutted to the dowel plate;

the adjusting gasket clamped between the first limiting plate and the dowel plate penetrates through the first rod part;

the adjusting nut is arranged on one side, far away from the dowel plate, of the first limiting plate and is in threaded connection with the first rod part.

4. The lower-limit movable ball-type support according to claim 3, wherein the adjusting washer is provided with a locking groove, one end of the locking groove extends to the edge of the adjusting washer to form an opening at the edge of the adjusting washer;

the first rod part is clamped into the locking groove through the opening, so that the adjusting gasket is arranged on the first rod part in a penetrating mode.

5. The lower-limit movable spherical bearing according to any one of claims 2 to 4, wherein the number of the adjusting shims is plural, and at least two of the plural adjusting shims have different thicknesses.

6. The lower-limiting movable spherical support according to claim 1, wherein the limiting adjustment device comprises a first limiting plate, a second adjusting bolt, and a plurality of adjusting blocks with different thicknesses;

the first limiting plate is fixedly connected with the lower seat plate;

the second adjusting bolt comprises a second rod part and a second head part arranged at one end of the second rod part, the second rod part penetrates through the first limiting plate and is in threaded connection with the first limiting plate, and the second head part is positioned on one side, far away from the spherical crown, of the first limiting plate;

one end of the second rod part far away from the second head part is selectively connected with one of the adjusting blocks in a threaded mode.

7. The lower-limit movable spherical bearing according to any one of claims 1 to 4 or 6, wherein the side of the spherical cap slidably connected with the upper seat plate is spherical, and the side of the spherical cap away from the upper seat plate is flat.

8. The lower-limit movable spherical bearing according to any one of claims 2 to 4, further comprising a middle seat plate having a sliding groove;

the middle seat plate is arranged between the two limiting and adjusting devices and is in sliding connection with the lower seat plate, and the sliding groove is positioned on one side, far away from the lower seat plate, of the middle seat plate;

the spherical crown is arranged in the sliding groove and is in sliding connection with the middle seat plate;

one side of the upper seat plate, which is in sliding connection with the spherical crown, extends into the sliding groove.

9. The lower-limit movable ball-type seat according to claim 8, wherein the middle seat plate abuts against the corresponding force transmission plate when the upper seat plate slides to a limit position relative to the lower seat plate along a longitudinal direction of the lower-limit movable ball-type seat.

10. The lower-limit movable ball-type support according to claim 8, further comprising two second limit plates disposed on the lower seat plate;

and the two second limiting plates are arranged on two sides of the middle seat plate along the transverse direction of the lower limiting movable spherical support and are in clearance fit with the middle seat plate so as to prevent the upper seat plate from sliding transversely along the lower limiting movable spherical support.

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