Axially adjustable fixed pulley

Abstract

The utility model provides an axially adjustable fixed pulley. The axially adjustable fixed pulley is characterized in that a positioning support structure is mounted on a tower crane; the transverse adjusting structure is mounted on the positioning and supporting structure and can horizontally move relative to the positioning and supporting structure; the pulley assembly is fixedly sleeved on the transverse adjusting structure and is used for bearing a steel wire rope; and the locking structure sleeves the transverse adjusting structure, is matched with the transverse adjusting structure, and is used for fixing the horizontal position of the transverse adjusting structure. Therefore, axial movement of the fixed pulley is achieved through the transverse adjusting structure, the problems that a steel wire rope abrades a diagonal web member, a winding drum is disordered, and the pulley is eccentrically abraded are effectively solved, and the situation of shutdown caused by fire operation on a construction site and maintenance is avoided. The locking structure can fix the position of the transverse adjusting structure, and the stability of the adjusted pulley is ensured. And the adjusting process is convenient and fast, the maintainability of the pulley is high, the service life of the steel wire rope is prolonged, and the working efficiency of the tower crane is also improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tower crane technical field, specifically, relate to an axial adjustable fixed pulley. BACKGROUND

[0002] The fixed pulley is an indispensable moving element of the tower crane during operation, which bears the steel wire rope and ensures the correct movement of the steel wire rope in the designed rope path. Since the fixed pulley is usually welded to the upper chord or lower chord of the jib or the tower cap during the production of the tower crane, the fixed pulley cannot be adjusted after installation, which leads to the following problems: when the position of the fixed pulley is improper, the steel wire rope is prone to rubbing against the inclined web member, and long-term friction may reduce the strength of the web member, even cause cracks or breakage, thereby affecting the overall structural safety of the crane; or during the winding process of the steel wire rope, the improper position of the fixed pulley may cause entanglement and disorder, reduce the winding efficiency, and even cause damage to the steel wire rope, increase the replacement and maintenance costs.

[0003] Therefore, it is necessary to provide a fixed pulley to solve the problems existing in the prior art. SUMMARY

[0004] The main purpose of the utility model is to provide an axial adjustable fixed pulley to at least solve the problems that the fixed pulley cannot be adjusted after installation in the prior art, which leads to the problems that the steel wire rope is prone to rubbing against the inclined web member when the position of the fixed pulley is improper, and the steel wire rope is entangled and disordered during the winding process.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an axial adjustable fixed pulley, which comprises: a positioning support structure installed on a tower crane; a horizontal adjustment structure installed on the positioning support structure, which can move horizontally relative to the positioning support structure; a pulley assembly fixed to the horizontal adjustment structure, which is used to bear the steel wire rope; and a locking structure fitted on the horizontal adjustment structure and cooperating with the horizontal adjustment structure, which is used to fix the horizontal position of the horizontal adjustment structure.

[0006] Optionally, the positioning support structure comprises: a pulley support plate comprising a first pulley support plate and a second pulley support plate arranged oppositely, the first ends of the first pulley support plate and the second pulley support plate are fixed to the tower crane, and coaxial through holes are formed in the second ends of the first pulley support plate and the second pulley support plate; a pulley shaft which is a stepped shaft comprising a large-diameter section and a small-diameter section; the pulley shaft is coaxially arranged in the through hole; and a pulley shaft fixing structure installed on the pulley support plate, which is used to limit the rotation of the pulley shaft in the through hole.

[0007] Optionally, the large-diameter section is provided with a stop groove, and the pulley shaft fixing structure comprises: a stop plate clamped in the stop groove; and a fixing screw for fixing the stop plate on the first pulley support plate.

[0008] Optionally, the outer surface of the small-diameter section is provided with threads, and the transverse adjusting structure comprises: a moving sleeve coaxially sleeved on the large-diameter section and axially movable along the pulley shaft; a plurality of first threaded holes are uniformly formed on the end surface of the moving sleeve outside the second pulley support plate; an adjusting nut is screwed on the outer surface of the small-diameter section, and the first end of the adjusting nut is matched with the end surface of the moving sleeve outside the second pulley support plate; the adjusting nut is uniformly provided with a plurality of second threaded holes in the circumferential direction, and each first threaded hole corresponds to each second threaded hole; and a plurality of countersunk head bolts are sequentially passed through one second threaded hole and the corresponding first threaded hole to fix the adjusting nut and the moving sleeve.

[0009] Optionally, one end of the moving sleeve outside the second pulley support plate is a first annular step, and the first end of the adjusting nut is a second annular step; when the moving sleeve is matched with the adjusting nut, the first annular step abuts against the second annular step.

[0010] Optionally, two groups of annular grooves are formed on the surface of the moving sleeve outside the first pulley support plate and the second pulley support plate, and the pulley assembly comprises: two groups of bearings sleeved on the moving sleeve and located between the two groups of annular grooves; a pulley sleeved on the outer surface of the two groups of bearings, the outer surface of the pulley being used for bearing a steel wire rope; two groups of first stop rings, each group of first stop rings being respectively installed in one annular groove, and the two groups of first stop rings being used for limiting the horizontal movement of the two groups of bearings on the moving sleeve; and a second stop ring arranged between one group of first stop rings and the adjacent bearing.

[0011] Optionally, a central groove is formed on the inner surface of the pulley, and the pulley assembly further comprises: a central groove elastic stop ring clamped in the central groove, the central groove elastic stop ring being used for isolating the two groups of bearings.

[0012] Optionally, the locking structure comprises: a locking nut screwed on the outer surface of the small-diameter section, one end surface of the locking nut abutting against the adjusting nut, and the locking nut being used for fixing the position of the adjusting nut.

[0013] The utility model scheme relates to a kind of axial adjustable fixed pulley, comprising: positioning support structure, positioning support structure is installed on tower crane;Transverse adjustment structure, transverse adjustment structure is installed on positioning support structure, and transverse adjustment structure can be moved horizontally relative to positioning support structure;Pulley assembly, pulley assembly is fixed in transverse adjustment structure, and pulley assembly is used to carry steel wire rope;Locking structure, locking structure is installed in transverse adjustment structure, and cooperate with transverse adjustment structure, and locking structure is used to fix the horizontal position of transverse adjustment structure. To realize the axial movement of fixed pulley by transverse adjustment structure, effectively solve the problems such as steel wire rope grinding inclined web, reel messy rope, pulley eccentric wear, avoid the fire operation of construction site and the downtime caused by maintenance;Locking structure can fix the position of transverse adjustment structure, ensure the stability of pulley after adjustment. Moreover, adjustment process is convenient and fast, and the maintainability of pulley is high, not only prolongs the service life of steel wire rope, but also improves the work efficiency of tower crane. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings accompanying the specification of this application form a part of it, serve to further provide a further understanding of the present application, and together with the description of the illustrative embodiments thereof, explain the present application, and do not constitute an undue limitation on the present application. In the drawings:

[0015] Figure 1 It is according to the embodiment of the utility model can be selected as a kind of axial adjustable fixed pulley appearance schematic diagram;

[0016] Figure 2 It is according to the embodiment of the utility model can be selected as Figure 1 B-B section schematic diagram in it;

[0017] Figure 3 It is according to the embodiment of the utility model can be selected as a kind of pulley shaft schematic diagram.

[0018] Reference signs:

[0019] 10, positioning support structure;11, pulley support plate;111, first pulley support plate;112, second pulley support plate;12, pulley shaft;13, pulley shaft fixing structure;131, stop plate;132, fixed screw;20, transverse adjustment structure;21, moving sleeve;22, adjusting nut;23, countersunk bolt;30, pulley assembly;31, bearing;32, pulley;33, first blocking ring;34, second blocking ring;35, center groove elastic blocking ring;40, locking structure;41, locking nut. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0021] As Figure 1 , Figure 2 shown, an axial adjustable fixed pulley, comprising: a positioning support structure 10, which is installed on a tower crane; a transverse adjustment structure 20, which is installed on the positioning support structure 10, and can move horizontally relative to the positioning support structure 10; a pulley assembly 30, which is fixedly sleeved on the transverse adjustment structure 20, and is used to bear the steel wire rope; and a locking structure 40, which is sleeved on the transverse adjustment structure 20, and cooperates with the transverse adjustment structure 20, and is used to fix the horizontal position of the transverse adjustment structure 20.

[0022] Specifically, the positioning support structure 10 is the basic installation part of the entire axial adjustable fixed pulley, and is installed on the tower crane. The transverse adjustment structure 20 is installed on the positioning support structure 10, and can move horizontally relative to the positioning support structure 10, so that the fixed pulley has adjustability in the horizontal direction. In actual application, when the relative position between the steel wire rope and the pulley is not ideal, such as the problems of steel wire rope grinding inclined boom, reel disordered rope, and pulley eccentric wear, by adjusting the horizontal position of the transverse adjustment structure 20 relative to the positioning support structure 10, the position of the pulley can be changed, thereby solving these problems. The pulley assembly 30 is fixedly sleeved on the transverse adjustment structure 20, and is used to bear the steel wire rope. In the operation process of the tower crane, the steel wire rope needs to slide on the pulley to realize force transmission and change of movement direction. The pulley assembly 30 can change position with the horizontal movement of the transverse adjustment structure 20 through the fixed sleeving relationship with the transverse adjustment structure 20, and then adjust the relative position relationship between the steel wire rope and the pulley, so as to ensure that the steel wire rope moves correctly in the designed rope way and avoid problems such as wear. The locking structure 40 is sleeved on the transverse adjustment structure 20, and cooperates with the transverse adjustment structure 20, and is used to fix the horizontal position of the transverse adjustment structure 20. When the pulley reaches the appropriate position by adjusting the transverse adjustment structure 20, the locking structure 40 can lock the transverse adjustment structure 20 at this position to prevent accidental movement of the transverse adjustment structure 20 in the working process, thereby ensuring the stability and reliability of the fixed pulley device and ensuring the normal operation of the tower crane.

[0023] The present application realizes the axial movement of the fixed pulley through the transverse adjustment structure 20, effectively solves the problems of steel wire rope grinding inclined boom, reel disordered rope, and pulley eccentric wear, avoids the fire operation on the construction site and the downtime caused by maintenance; the locking structure 40 can fix the position of the transverse adjustment structure 20 to ensure the stability of the pulley after adjustment. Moreover, the adjustment process is convenient and fast, the maintainability of the pulley is high, which not only prolongs the service life of the steel wire rope, but also greatly improves the working efficiency of the tower crane.

[0024] In one possible implementation, the positioning support structure 10 comprises: a pulley support plate 11, the pulley support plate 11 comprising a first pulley support plate 111 and a second pulley support plate 112, oppositely arranged, first ends of the first pulley support plate 111 and the second pulley support plate 112 being fixed to the tower crane, second ends of the first pulley support plate 111 and the second pulley support plate 112 being provided with coaxial through holes; a pulley shaft 12, the pulley shaft 12 being a stepped shaft comprising a large-diameter section and a small-diameter section; the pulley shaft 12 being coaxially arranged in the through holes; a pulley shaft fixing structure 13, the pulley shaft fixing structure 13 being mounted on the pulley support plate 11, the pulley shaft fixing structure 13 being used to limit rotation of the pulley shaft 12 in the through holes.

[0025] Specifically, the pulley support plate 11 supports and fixes the pulley shaft 12, providing stable basic support for the entire axial adjustable pulley device. The pulley support plate 11 is composed of the first pulley support plate 111 and the second pulley support plate 112, the two parts being oppositely arranged to ensure stability and balance of the pulley shaft 12 during installation and use. The first ends of the first pulley support plate 111 and the second pulley support plate 112 are fixed to the tower crane. The specific fixing method can be through welding, bolt connection or other reliable mechanical connection methods, depending on the structure and design requirements of the tower crane. The second ends of the first pulley support plate 111 and the second pulley support plate 112 are provided with coaxial through holes. The coaxial through holes are designed to allow the pulley shaft 12 to pass through smoothly and ensure that the position of the pulley shaft 12 in the through holes is relatively fixed, thereby providing accurate guidance for the installation and operation of the pulley. The design of the coaxial through holes requires that the center lines of the two through holes be on the same straight line, so that the pulley shaft 12 will not be inclined after installation, ensuring normal rotation of the pulley and smooth running of the steel wire rope.

[0026] The pulley shaft 12 bears the weight of the pulley assembly 30 and the steel wire rope and transmits various forces, and is designed as a stepped shaft, with the difference between the large-diameter section and the small-diameter section facilitating cooperation with other components. The pulley shaft fixing structure 13 is mounted on the pulley support plate 11, and its main function is to limit rotation of the pulley shaft 12 in the through holes. The pulley shaft fixing structure 13 can limit the rotation of the pulley shaft 12 in various ways, such as key connection, pin fixing, nut fastening, etc. Specifically, the key connection can circumferentially fix the pulley shaft 12 to the wall of the through hole on the pulley support plate 11 to prevent the pulley shaft 12 from rotating in the through hole; the pin fixing can provide corresponding pin holes on the pulley shaft 12 and the through hole respectively, and the rotation is limited by inserting a pin; the nut fastening can provide nuts on both ends of the pulley shaft 12, and the pulley shaft 12 is fixed in the through hole by tightening the nuts

[0027] In one possible implementation, a stop groove is provided in the large diameter section, and the pulley shaft fixing structure 13 includes: a stop plate 131, which is stuck in the stop groove; and a fixing screw 132, which is used to fix the stop plate 131 on the first pulley support plate 11.

[0028] Specifically, such as Figure 3 As shown, a stop groove is provided in the large-diameter section of the pulley shaft 12, and a stop plate 131 is engaged in the stop groove, forming a tight fit between the stop plate 131 and the pulley shaft 12. On the one hand, the stop plate 131 engaged in the stop groove can effectively prevent the pulley shaft 12 from rotating relative to the through hole; on the other hand, this engaging structure also makes the installation and removal of the stop plate 131 relatively convenient. When it is necessary to adjust or maintain the pulley shaft 12, the stop plate 131 can be easily removed from the stop groove.

[0029] The stop plate 131 is fixed to the first pulley support plate 11 by fixing screws 132, thereby enhancing the stability of the entire fixing structure. The fixing screws 132 typically fix the stop plate 131 to the first pulley support plate 11 via a threaded connection. Specifically, the stop plate 131 is provided with corresponding threaded holes or mounting grooves. The fixing screws 132 pass through these holes or grooves and are tightened by engaging with the threaded holes on the first pulley support plate 11. In this way, the fixing screws 132 can firmly press the stop plate 131 onto the first pulley support plate 11, preventing the stop plate 131 from loosening or shifting, thus ensuring that the stop plate 131 can be stably locked in the stop groove of the pulley shaft 12, effectively limiting the rotation of the pulley shaft 12.

[0030] In one possible implementation, the outer surface of the small-diameter section is threaded, and the lateral adjustment structure 20 includes: a movable sleeve 21, which is rotatably coaxially fitted onto the large-diameter section and can move axially along the pulley shaft 12; a plurality of first threaded holes are uniformly formed circumferentially on the end face of the movable sleeve 21 located on the outer side of the second pulley support plate 112; an adjusting nut 22, which is screwed onto the outer surface of the small-diameter section, and the first end of the adjusting nut 22 engages with the end face of the movable sleeve 21 located on the outer side of the second pulley support plate 112; a plurality of second threaded holes are uniformly formed circumferentially on the adjusting nut 22, and each first threaded hole corresponds to each second threaded hole; and a plurality of countersunk bolts 23, each countersunk bolt 23 passing sequentially through a second threaded hole and a corresponding first threaded hole, for fixing the adjusting nut 22 to the movable sleeve 21.

[0031] Specifically, threads are formed on the outer surface of the small-diameter section of the sheave shaft 12, and the presence of the threads enables the adjusting nut 22 to be screwed onto the small-diameter section. By rotating the adjusting nut 22, the axial position of the adjusting nut 22 on the sheave shaft 12 can be changed, which in turn drives the movement of the moving sleeve 21 that cooperates with the adjusting nut 22 to move axially, and ultimately achieves the adjustment of the position of the sheave assembly 30 in the transverse direction, so as to solve the problem of the relative position between the steel wire rope and the sheave being not ideal. The moving sleeve 21 is coaxially sleeved on the large-diameter section in a rotatable manner, so that the moving sleeve 21 can rotate relatively freely on the large-diameter section of the sheave shaft 12, thereby enabling the moving sleeve 21 to more flexibly adapt to different adjustment requirements during the adjustment process, and reducing the difficulty of adjustment caused by factors such as friction. At the same time, the moving sleeve 21 can also move axially along the sheave shaft 12, and through the axial movement, the moving sleeve 21 can drive the sheave assembly 30 to move in the transverse direction, so as to change the relative position between the sheave and the steel wire rope.

[0032] The moving sleeve 21 is uniformly provided with a plurality of first threaded holes on the end face outside the second sheave support plate 112. A plurality of uniformly distributed mounting points are provided for the connection of the adjusting nut 22. The adjusting nut 22 is screwed onto the outer surface of the small-diameter section, so that the adjusting nut 22 can freely rotate and move axially on the small-diameter section of the sheave shaft 12. The first end of the adjusting nut 22 cooperates with the end face of the moving sleeve 21 outside the second sheave support plate 112, and when the adjusting nut 22 rotates on the sheave shaft 12, it will drive the moving sleeve 21 to move axially along the sheave shaft 12, thereby driving the sheave assembly 30 to adjust the transverse position. The adjusting nut 22 is uniformly provided with a plurality of second threaded holes in the circumferential direction, and each first threaded hole corresponds to each second threaded hole, so as to ensure that the countersunk bolt 23 can accurately pass through the second threaded hole and the corresponding first threaded hole, and firmly fix the adjusting nut 22 and the moving sleeve 21 together.

[0033] Each countersunk bolt 23 passes through a second threaded hole and a corresponding first threaded hole in sequence, for fixing the adjusting nut 22 and the moving sleeve 21. The head of the countersunk bolt 23 is designed in a countersunk shape, and when the bolt is tightened, the head can be embedded below the surface of the adjusting nut 22 and does not protrude from the surface, thereby avoiding interference or collision of the bolt head with other components during work, and ensuring the normal operation of the entire device. At the same time, the countersunk bolt 23 tightly fixes the adjusting nut 22 and the moving sleeve 21 together through threaded connection, so as to ensure that the relative position between the two does not change during the adjustment process, and to ensure the accuracy and stability of the transverse adjustment.

[0034] In a possible implementation, the mobile sleeve 21 is provided with a first annular step at one end outside the second pulley support plate 112, and the first end of the adjusting nut 22 is provided with a second annular step; wherein when the mobile sleeve 21 cooperates with the adjusting nut 22, the first annular step and the second annular step abut.

[0035] Specifically, the mobile sleeve 21 is provided with a first annular step at one end outside the second pulley support plate 112, and the first end of the adjusting nut 22 is provided with a second annular step. The abutment of the first annular step and the second annular step provides clear axial positioning and limiting function for the relative position of the mobile sleeve 21 and the adjusting nut 22. During assembly, the abutment structure of the first annular step and the second annular step provides a clear installation position reference for the operator. The operator can more easily align and assemble the adjusting nut 22 with the mobile sleeve 21, ensuring that the two can be accurately fitted together. At the same time, this structure also helps to preliminarily position and fix the components during installation, reducing the difficulty of subsequent adjustment due to inaccurate installation.

[0036] In a possible implementation, the surface of the mobile sleeve 21 located between the first pulley support plate 111 and the second pulley support plate 112 is provided with two sets of annular grooves, and the pulley assembly 30 comprises: two sets of bearings 31, the two sets of bearings 31 are sleeved on the mobile sleeve 21 and located between the two sets of annular grooves; a pulley 32, the pulley 32 is sleeved on the outer surface of the two sets of bearings 31, and the outer surface of the pulley 32 is used to carry the steel wire rope; two sets of first retaining rings 33, each set of first retaining ring 33 is installed in one annular groove, and the two sets of first retaining rings 33 are used to limit the horizontal movement of the two sets of bearings 31 on the mobile sleeve 21; a second retaining ring 34, the second retaining ring is arranged between one of the two sets of first retaining rings 33 and the adjacent bearing 31.

[0037] Specifically, the two sets of bearings 31 are sleeved on the mobile sleeve 21 and located between the two sets of annular grooves. The main function of the bearing 31 is to reduce the friction between the pulley 32 and the mobile sleeve 21 during rotation, so that the pulley can rotate more smoothly around the pulley shaft 12. The pulley 32 is sleeved on the outer surface of the two sets of bearings 31, and the outer surface of the pulley 32 is used to carry the steel wire rope. In actual work, the steel wire rope slides on the pulley 32, and through the cooperation of the pulley and the bearing 31, the force is transmitted and the direction of motion is changed.

[0038] The first stop ring 33 is an elastic stop ring, and each group of first stop rings 33 is respectively installed in a ring groove to limit the horizontal movement of the two groups of bearings 31 on the moving sleeve 21. During the operation of the pulley assembly 30, the bearings 31 may be horizontally displaced due to various forces, affecting the normal rotation of the pulley and the stability of the entire device. The first stop ring 33, through cooperation with the ring groove, can effectively prevent unnecessary horizontal movement of the bearings 31, ensure the relative position of the bearings 31 and the pulley 32 on the moving sleeve 21, and thus ensure the reliability and stability of the fixed pulley device. The second stop ring 34 can prevent unnecessary axial movement of the bearings 31 and ensure that the bearings 31 are in the correct installation position in the axial direction.

[0039] In a possible implementation, the inner surface of the pulley 32 is provided with a center groove, and the pulley assembly 30 further comprises:

[0040] A center groove elastic stop ring 35 is clamped in the center groove, and the center groove elastic stop ring 35 is used to isolate the two groups of bearings 31.

[0041] Specifically, the center groove provided on the inner surface of the pulley 32 provides a spatial position for the subsequent installation of the center groove elastic stop ring 35, so that the center groove elastic stop ring 35 can be accurately installed in place, thereby effectively isolating the two groups of bearings 31.

[0042] The center groove elastic stop ring 35 is an elastic annular component, which is matched in shape and size with the center groove of the inner surface of the pulley 32, so that the center groove elastic stop ring 35 can be easily clamped into the center groove during installation by its own elastic deformation, and after installation is completed, it can be firmly fixed in the center groove by its own elastic restoring force, and is not prone to looseness or displacement. During the operation of the pulley assembly 30, the two groups of bearings 31 respectively bear the support of the pulley 32 and enable it to rotate smoothly. However, in actual operation, due to the action of various forces and the interaction between components, the two groups of bearings 31 may interfere or collide with each other unnecessarily. The center groove elastic stop ring 35, by being clamped in the center groove and located between the two groups of bearings 31, can effectively prevent such interference and collision, improve the independence and stability of the two groups of bearings 31, so that they can more evenly bear the load transmitted by the pulley 32, prolong the service life of the bearings, and thus ensure the normal operation of the entire pulley assembly 30 and the reliability of the fixed pulley device.

[0043] In a possible implementation, the locking structure 40 comprises:

[0044] A locking nut 41 is screwed onto the outer surface of the small-diameter section, one end face of the locking nut abuts against the adjusting nut 22, and the locking nut 41 is used to fix the position of the adjusting nut 22.

[0045] Specifically, the locking nut 41 is connected to the outer surface of the small-diameter section of the pulley shaft 12 by screwing. The locking nut 41 can be relatively rotated and axially moved on the pulley shaft 12 until reaching a predetermined position.

[0046] When the locking nut 41 is tightened, its end surface gradually approaches and finally tightly contacts the adjusting nut 22, thereby generating a certain pressure to fix the adjusting nut 22 at a specific position on the pulley shaft 12.

[0047] In the working process of the lateral adjustment structure 20, the adjusting nut 22 is moved on the small-diameter section of the pulley shaft 12 by rotation, thereby driving the moving sleeve 21 to axially move and achieving adjustment of the position of the pulley assembly 30. However, in order to ensure that the pulley assembly 30 can be stably maintained at the required position after adjustment, it is necessary to fix the position of the adjusting nut 22. The locking nut 41 effectively prevents the adjusting nut 22 from accidentally rotating or axially moving on the pulley shaft 12 through the abutting action with the adjusting nut 22. When the locking nut 41 is tightened and abuts against the adjusting nut 22, sufficient friction is generated between the two, so that the adjusting nut 22 is not easily displaced when subjected to external force. This fixing method is simple and reliable, which can ensure the position stability of the pulley assembly 30 while facilitating adjustment operation.

[0048] The axial adjustable pulley installation and use process is as follows:

[0049] Installation process: first, install two sets of bearings 31 and center groove elastic retainer rings 35 into the pulley 32, then put them on the moving sleeve 21 and fix them with two sets of first retainer rings 33. Then, make the two sets of bearings 31, center groove elastic retainer rings 35 and pulleys 32 concentric with the through holes of the first pulley support plate 111 and the second pulley support plate 112. At this time, the stop plate 131 is clamped into the stop groove of the pulley shaft 12, the adjusting nut 22 is combined with the moving sleeve 21 by rotation, and a plurality of countersunk head bolts are inserted from the end surface of the adjusting nut 22 to fix the moving sleeve 21 and the adjusting nut 22 as a whole. At this time, the moving sleeve 21 can complete axial movement together with the adjusting nut 22. When the pulley 32 reaches the required position with the moving sleeve 21, the locking nut 41 is used to lock the adjusting nut 22 to form a double-nut anti-loose structure, and the axial movement is completed to achieve position fixation.

[0050] Practical application: the pulley 32 is in the middle position of the first pulley support plate 111 and the second pulley support plate 112 when leaving factory, when the steel wire rope appears to slide the pulley 32 left side, first counterclockwise rotate the locking nut 41, so that the locking nut 41 loosens the adjusting nut 22, then clockwise rotate the adjusting nut 22 to drive the moving sleeve 21 to rotate clockwise, drive the pulley to move left side, when moving to the appropriate position, clockwise rotate the locking nut 41 close to the moving sleeve threaded end, form double nut clamping; when it appears to need to adjust the pulley to the right side, first counterclockwise rotate the locking nut 41, so that the locking nut 41 loosens the adjusting nut 22, then counterclockwise rotate the adjusting nut 22 and the moving sleeve 21, the moving sleeve 21 drives the pulley 32 to move to the right side, the pulley 32 moves to the position required, then clockwise rotate the locking nut 41, the locking nut 41 and the adjusting nut 22 form double nut clamping to the moving sleeve, complete the adjustment of the pulley 32 on the moving shaft.

[0051] The preferred embodiments of the present application have been described above by way of example only, not for limitation, and various changes and modifications can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An axially adjustable sheave, characterized by, The utility model relates to a tower crane horizontal position locking device, including: Positioning support structure (10) is installed on tower crane; Transverse adjustment structure (20) is installed on the positioning support structure (10), and the transverse adjustment structure (20) can move horizontally relative to the positioning support structure (10); Pulley assembly (30) is fixedly sleeved on the transverse adjustment structure (20), and the pulley assembly (30) is used for carrying steel wire rope; Locking structure (40) is sleeved on the transverse adjustment structure (20) and cooperates with the transverse adjustment structure (20), and the locking structure (40) is used for fixing the horizontal position of the transverse adjustment structure (20).

2. An axially adjustable sheave as claimed in claim 1, wherein, The positioning support structure (10) includes: Pulley support plate (11) includes first pulley support plate (111) and second pulley support plate (112) and is oppositely arranged, and the first end of the first pulley support plate (111) and the second pulley support plate (112) is fixed to the tower crane, and the second end of the first pulley support plate (111) and the second pulley support plate (112) is coaxially provided with a through hole; Pulley shaft (12) is a stepped shaft and includes a large-diameter section and a small-diameter section;The pulley shaft (12) is coaxially arranged in the through hole; Pulley shaft fixing structure (13) is installed on the pulley support plate (11), and the pulley shaft fixing structure (13) is used to limit the rotation of the pulley shaft (12) in the through hole.

3. An axially adjustable sheave as claimed in claim 2, wherein, The large-diameter section is provided with a stop groove, and the pulley shaft fixing structure (13) includes: Stop plate (131) is clamped in the stop groove; Fixed screw (132) is used for fixing the stop plate (131) on the first pulley support plate (111).

4. An axially adjustable sheave as claimed in claim 3, wherein, The outer surface of the small-diameter section is provided with a thread, and the transverse adjustment structure (20) includes: Moving sleeve (21) is rotatably coaxially sleeved on the large-diameter section, and the moving sleeve (21) can move axially along the pulley shaft (12);The moving sleeve (21) is uniformly provided with a plurality of first threaded holes on the end face outside the second pulley support plate (112); Adjusting nut (22) is screwed on the outer surface of the small-diameter section, and the first end of the adjusting nut (22) cooperates with the end face outside the second pulley support plate (112) of the moving sleeve (21);The adjusting nut (22) is uniformly provided with a plurality of second threaded holes along the circumference, and each first threaded hole corresponds to each second threaded hole; A plurality of countersunk head bolts (23) are sequentially passed through one second threaded hole and corresponding first threaded hole, and are used for fixing the adjusting nut (22) and the moving sleeve (21).

5. An axially adjustable sheave as claimed in claim 4 wherein, The mobile sleeve (21) is provided with a first annular step at one end outside the second pulley support plate (112), and the first end of the adjusting nut (22) is provided with a second annular step. When the mobile sleeve (21) cooperates with the adjusting nut (22), the first annular step abuts against the second annular step.

6. An axially adjustable sheave as claimed in claim 4 wherein, The surface of the mobile sleeve (21) is provided with two groups of annular grooves in the circumferential direction of the mobile sleeve (21), and the pulley assembly (30) comprises: Two groups of bearings (31), which are sleeved on the mobile sleeve (21) and located between the two groups of annular grooves; A pulley (32) is sleeved on the outer surface of the two groups of bearings (31), and the outer surface of the pulley (32) is used for bearing the steel wire rope; Two groups of first stop rings (33), each of which is installed in one of the annular grooves, and the two groups of first stop rings (33) are used for limiting the horizontal movement of the two groups of bearings (31) on the mobile sleeve (21); A second stop ring (34) is arranged between one of the first stop rings (33) and the adjacent bearing (31).

7. An axially adjustable sheave as claimed in claim 6 wherein, The inner surface of the pulley (32) is provided with a central groove, and the pulley assembly (30) further comprises: A central groove elastic stop ring (35) is clamped in the central groove, and the central groove elastic stop ring (35) is used for isolating the two groups of bearings (31).

8. An axially adjustable sheave as claimed in claim 4 wherein, The locking structure (40) comprises: A locking nut (41) is screwed on the outer surface of the small-diameter section, one end face of the locking nut abuts against the adjusting nut (22), and the locking nut (41) is used for fixing the position of the adjusting nut (22).

Images