CN219864602U - Hanging pulley mechanism convenient to replace and sliding door system - Google Patents

Abstract

The utility model discloses a hanging pulley mechanism convenient to replace and a sliding door system, wherein the hanging pulley mechanism comprises a main body part, two pulley assemblies and a limiting part, wherein each pulley assembly comprises a pulley support part and a roller wheel arranged on the pulley support part, and the two pulley support parts are oppositely arranged on the main body part; the locating part detachable installs in the main part, and the locating part installs in the main part, the locating part is restricted so that two pulley support pieces can't break away from the main part jointly with the main part, when the locating part was dismantled from the main part, two pulley support pieces can break away from the main part, through above-mentioned structure, when hanging pulley mechanism need change, can be with two pulley sub-assemblies respectively from the guide rail in tearing out through tearing out the locating part, when installing new hanging pulley, it can to reassemble hanging pulley mechanism, and need not to dismantle the guide rail or demolish the section bar, the dismantlement of conveniently hanging the pulley is changed, improve the efficiency of maintaining, reduce maintenance cost.

Description

Hanging pulley mechanism convenient to replace and sliding door system

Technical Field

The utility model relates to the technical field of movable doors, in particular to a hanging pulley mechanism convenient to replace and a movable door system.

Background

The hanging pulley is an important part of a movable door and is widely applied to the field of bathrooms. The hanging pulley is generally hung on a guide rail of the movable door, so that the door body can move along the guide rail, and the door body can be connected with part of the falling force of the door body, so that the bearing force of a hinge at the side edge of the door body is reduced, and the door body can be opened and closed.

The existing hanging pulley is capable of moving back and forth on the guide rail in order to ensure that the wheels can be fixed on the guide rail, the width of the hanging pulley is larger than that of the opening of the guide rail, the pulley belongs to a vulnerable part, the phenomenon that the wheels are damaged in the use process can occur, the new pulley can be replaced only by disassembling the guide rail when the pulley is replaced, the wall material is required to be disassembled when the guide rail is disassembled by a certain sliding door structure, and the maintenance efficiency is influenced to increase the maintenance cost due to the fact that the maintenance mode is longer in process.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the hanging pulley mechanism convenient to replace, which can realize the replacement and installation of the hanging pulley in the guide rail without disassembling the guide rail, is convenient for the replacement of the hanging pulley and improves the maintenance efficiency of the hanging pulley.

The utility model further provides a movable door system which can facilitate maintenance of the movable door.

The hanging pulley mechanism convenient to replace according to the embodiment of the first aspect of the utility model comprises a main body part, two pulley assemblies and a limiting part, wherein each pulley assembly comprises a pulley support part and a roller wheel arranged on the pulley support part, and the two pulley support parts are oppositely arranged on the main body part; the limiting piece is detachably arranged on the main body piece, when the limiting piece is arranged on the main body piece, the limiting piece and the main body piece are limited together so that the two pulley support pieces cannot be separated from the main body piece, and when the limiting piece is detached from the main body piece, the two pulley support pieces can be separated from the main body piece.

The hanging pulley mechanism convenient to replace provided by the embodiment of the utility model has at least the following beneficial effects: when the hanging pulley mechanism needs to be replaced, the two pulley assemblies can be detached from the guide rail respectively through the detachment limiting piece, and when a new hanging pulley is installed, the hanging pulley mechanism is reassembled, and the guide rail is not required to be detached or the section bar is not required to be detached, so that the hanging pulley is convenient to detach and replace, the maintenance efficiency is improved, and the maintenance cost is reduced.

According to some embodiments of the utility model, a concave-convex matching structure is arranged between the pulley support piece and the main body piece, and the limiting piece can limit the concave-convex matching structure to separate when the limiting piece is mounted on the main body piece.

According to some embodiments of the utility model, the concave-convex matching structure comprises a protruding portion arranged on the pulley support and a groove arranged on the main body, one side or two sides of the groove corresponding to the sliding direction of the hanging pulley mechanism are of an opening structure, the protruding portion of the pulley support can be clamped into the groove along the sliding direction of the hanging pulley mechanism through the opening structure, a limiting structure is arranged between the limiting member and the pulley support, and the limiting structure can limit the protruding portion of the pulley support to move relative to the main body along the sliding direction of the hanging pulley mechanism and limit the pulley support to move downwards relative to the main body.

According to some embodiments of the utility model, the limiting structure includes a clamping groove disposed at a bottom of the pulley support, when the two pulley supports are disposed opposite to each other on the main body, the two clamping grooves of the two pulley supports cooperate to form a limiting groove corresponding to the limiting member, and when the limiting member is mounted on the main body, the limiting member can be clamped into the limiting groove, so as to limit the protrusion of the pulley support to move relative to the main body along a sliding direction of the hanging pulley mechanism and limit the pulley support to move downward relative to the main body.

According to some embodiments of the utility model, the groove is disposed in the middle of the main body, the protruding portion is configured corresponding to the groove, a boss is disposed at a position of the clamping groove away from the middle of the main body, the limiting piece is detachably mounted to the main body through a fastening mechanism, and the limiting piece and the boss are mutually pressed against each other.

According to some embodiments of the utility model, the limiting member is detachably mounted to the main body member by a fastening screw or a bolt assembly, and a gap is formed between the limiting member and a groove wall of the limiting groove.

According to some embodiments of the utility model, the upper portion of the body member is removably mounted with a damper positioning member.

According to some embodiments of the utility model, the hanging pulley mechanism further comprises a hanging body for mating connection with the door body, the hanging body is mounted to the main body and/or the limiting member by a screw mechanism, and the hanging body is configured with an expansion structure.

According to some embodiments of the utility model, the pendant body is provided with an expansion groove, the expansion structure comprises an expansion pressing block arranged in the expansion groove and a tip screw arranged in the pendant body in a threaded fit manner, the expansion pressing block is provided with a separation groove, and the end part of the tip screw can be screwed into the separation groove to prop open the expansion pressing block.

An embodiment of a sliding door system according to the second aspect of the utility model comprises a hanging pulley mechanism as described in any of the embodiments above.

The sliding door system provided by the embodiment of the utility model has at least the following beneficial effects: the movable door can be conveniently installed and used, and the subsequent movable door can be conveniently maintained.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of a hanging pulley mechanism according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a hanging pulley mechanism according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram illustrating an assembly of a hanging pulley mechanism according to an embodiment of the present utility model;

FIG. 4 is a second schematic view of an assembly of a hanging pulley mechanism according to an embodiment of the present utility model (bottom view);

FIG. 5 is one of the exploded schematic views of the pulley assembly of the embodiment of the present utility model;

FIG. 6 is a second exploded view (bottom view) of the pulley assembly of the embodiment of the present utility model;

FIG. 7 is an exploded view of a pendant body according to an embodiment of the present utility model;

FIG. 8 is a schematic diagram illustrating the installation of a hanging pulley mechanism according to an embodiment of the present utility model.

Reference numerals:

the main body piece 100, the groove 101, the threaded hole 102 and the avoiding hole 103;

pulley assembly 200, pulley support 210, boss 211, clamping groove 212, boss 213, roller 220;

a limiting piece 300, a counter bore 301 and a fastening screw 310;

damper positioning member 400, damper 410, guide rail 420;

pendant body 500, expansion tank 501, expansion press block 510, partition tank 511, tip screw 520, latch 530, pendant screw 540;

a door 900 and a hanging piece mounting groove 901.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

In the description of the present utility model, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the related art, when the hanging pulley is damaged or worn and torn greatly, the hanging pulley needs to be replaced and maintained in time so as to ensure the sliding smoothness of the sliding door, the opening at the lower part of the guide rail is designed to be smaller than the width of the hanging pulley, so that the roller of the hanging pulley can be inversely hung in the guide rail, but when the hanging pulley needs to be disassembled and maintained, the new pulley needs to be replaced by disassembling the guide rail, and some sections need to be disassembled, so that the hanging pulley is very inconvenient to replace, consumes time and labor, and has high maintenance cost.

A hanging pulley mechanism for easy replacement according to an embodiment of the present utility model is described below with reference to fig. 1 to 8.

As shown in fig. 1 to 4, the hanging pulley mechanism with convenient replacement according to the embodiment of the first aspect of the present utility model includes a main body 100, two pulley assemblies 200 and a limiting member 300, wherein the pulley assemblies 200 include pulley support members 210 and rollers 220 disposed on the pulley support members 210, and the two pulley support members 210 are disposed opposite to the main body 100; the limiting member 300 is detachably mounted on the main body member 100, and when the limiting member 300 is mounted on the main body member 100, the limiting member 300 and the main body member 100 are limited together so that the two pulley support members 210 cannot be separated from the main body member 100, and when the limiting member 300 is detached from the main body member 100, the two pulley support members 210 can be separated from the main body member 100.

Through the structure, when the hanging pulley mechanism needs to be replaced, the two pulley assemblies 200 can be detached from the guide rail respectively by removing the limiting piece 300, and when a new hanging pulley is installed, the hanging pulley mechanism can be reassembled without disassembling the guide rail or dismantling the sectional material, so that the hanging pulley is convenient to disassemble and replace, the maintenance efficiency is improved, and the maintenance cost is reduced.

It is contemplated that the profile of the single set of pulley assemblies 200 can be made smaller to facilitate replacement and maintenance through the lower opening of the guide rail, and that the damaged pulley assembly 200 can be replaced alone, or the rollers can be replaced, or the hanging pulley mechanism can be replaced entirely during replacement and maintenance, as desired by the user.

It is contemplated that in some embodiments of the present utility model, the stop member 300 is detachably mounted to the body member 100 by a mounting mechanism that can be released below the hanging pulley mechanism to allow access to the tool at the opening in the lower portion of the rail for unlocking, facilitating removal and replacement of the hanging pulley.

Of course, in the implementation, the mounting mechanism may also be configured to be released laterally, or configured to be unlocked by a special tool, which is not described in detail herein.

It can be appreciated that in some embodiments of the present utility model, a concave-convex matching structure is provided between the pulley support 210 and the main body 100, and when the limiting member 300 is mounted on the main body 100, the limiting member 300 can limit the separation of the concave-convex matching structure, so that the pulley support 210 and the main body 100 are kept in a clamped state, the concave-convex matching structure is simpler, and when the limiting member 300 is dismounted, the concave-convex matching structure can be conveniently separated, thereby improving the convenience of replacing the hanging pulley.

It is contemplated that in some embodiments of the present utility model, the pulley support 210 and the main body 100 may be limited by a plug structure, for example, a plug is disposed between the pulley support 210 and the main body 100, and the limiting member 300 is used for limiting the plug, so as to achieve a detachable function of the pulley support 210 and the main body 100.

As shown in fig. 2 to 4, in some embodiments of the present utility model, the concave-convex matching structure includes a protrusion 211 disposed on the pulley support 210 and a groove 101 disposed on the main body 100, one or both sides of the groove 101 corresponding to the sliding direction of the hanging pulley mechanism are open structures, the protrusion 211 of the pulley support 210 can be clamped into the groove 101 along the sliding direction of the hanging pulley mechanism through the open structures, a limiting structure is disposed between the limiting member 300 and the pulley support 210, and the limiting structure can limit the protrusion 211 of the pulley support 210 to move relative to the main body 100 along the sliding direction of the hanging pulley mechanism and limit the pulley support 210 to move downward relative to the main body 100.

Since the pulley support 210 is mounted in the main body 100 in a laterally sliding manner (along the sliding direction of the hanging pulley mechanism), after the limiting member 300 is removed, the pulley support 210 can move along the length direction of the guide rail in the guide rail, so that the protruding portion 211 slides out of the groove 101, and the pulley assembly 200 is removed from the main body 100, thereby being convenient and quick to detach.

Specifically, the limiting member 300 is disposed below the main body member 100, and clamps the pulley support member 210 between the limiting member 300 and the main body member 100, so as to limit the pulley support member 210 from moving downward, and meanwhile, a limiting structure is disposed between the limiting member 300 and the pulley support member 210, so as to limit the pulley support member 210 from moving and moving downward relative to the main body member 100 along the sliding direction of the hanging pulley mechanism, so that the pulley support member 210 can be stably mounted to the main body member 100.

It will be appreciated that in some embodiments of the utility model, the pulley support 210 may be configured to be detachable downwardly from the body member 100. In particular, the pulley support 210 may be configured to be narrower, and upon removal of the stop 300, the pulley support 210 may be deflected from the initial position and allowed to move upwardly to disengage the rollers from the rail, and then tilt the pulley assembly 200 so that it can be passed directly from top to bottom through the lower opening of the rail.

As shown in fig. 4 and 6, in some embodiments of the present utility model, the limiting structure includes a clamping groove 212 disposed at the bottom of the pulley support 210, when the two pulley supports 210 are disposed opposite to the main body 100, the two clamping grooves 212 of the two pulley supports 210 cooperate to form a limiting groove corresponding to the limiting piece 300, when the limiting piece 300 is mounted to the main body 100, the protruding portion 211 of the pulley support 210 can be clamped into the limiting groove to limit the movement of the pulley support 210 relative to the main body 100 along the sliding direction of the hanging pulley mechanism and limit the downward movement of the pulley support 210 relative to the main body 100, i.e. when the limiting piece 300 is mounted to the main body 100, the limiting piece 300 can be respectively matched with the clamping grooves 212 of the two pulley supports 210, so as to limit the movement and the downward movement of the two pulley supports 210 relative to the main body 100 along the sliding direction of the hanging pulley mechanism.

It is contemplated that in some embodiments of the present utility model, the limiting structure may also be a concave-convex matching structure disposed between the limiting member 300 and the pulley support member 210, so as to limit the pulley support member 210 to move relative to the main body member 100, for example, a plurality of limiting posts may be disposed on the limiting member 300, and grooves corresponding to the limiting posts may be disposed on the pulley support member 210.

As shown in fig. 4 and 6, in some embodiments of the present utility model, the groove 101 is disposed in the middle of the main body 100, the boss 211 is configured corresponding to the groove 101, the boss 213 is disposed at a position of the clamping groove 212 away from the middle of the main body 100, the limiting member 300 is detachably mounted to the main body 100 through the fastening mechanism, and the limiting member 300 and the boss 213 abut against each other, and when the limiting member 300 is fastened and mounted through the boss 213, the limiting member 300 can push the pulley support 210 towards the center of the main body 100 through the boss 213, so as to be closely attached to the main body 100, thereby ensuring the assembly accuracy.

Specifically, the protrusion 211 and the groove 101 are matched at the middle position of the main body member 100 to form a fulcrum, the boss 213 is located at an outer position, the limiting member 300 pushes the pulley support member 210 through the boss 213, if an assembly gap exists, the pulley support member 210 rotates towards the direction of approaching the main body member 100, so that the pulley support member 210 is tightly attached to the main body member 100, the assembly precision is improved, and the precision of the wheel track of the roller is ensured.

As shown in fig. 5 and 6, in some embodiments of the present utility model, the cross section of the pulley support 210 is in an L-shaped structure, the limiting member 300 is in a square structure, and when the pulley support 210 approaches the limiting member 300, a tight fitting structure can be formed, so as to improve the stability and the assembly precision of the assembly.

It is contemplated that in some embodiments of the present utility model, the length of the pulley support 210 and the stop 300 are consistent, resulting in a more compact and compact construction of the hanging pulley assembly.

As shown in fig. 3 to 6, in some embodiments of the present utility model, the groove 101 is disposed in the middle of the main body 100, the protrusions 211 of the two pulley supports 210 are relatively distributed on one side near the middle of the main body 100, and one side of the two pulley supports 210 near the middle of the main body 100 is in a planar structure, so that the two pulley supports can be closely mounted when mounted, and the structural stability is better.

As shown in fig. 5 and 6, in some embodiments of the present utility model, a side of the protrusion 211 away from the middle of the body member 100 is configured as a slope, so as to facilitate the protrusion 211 to be snapped into the groove 101.

Specifically, in practical application, the installation space in the guide rail is smaller, the outer side of the protruding portion 211 is set to be an inclined surface structure, so that the protruding portion 211 can be conveniently clamped into the groove 101, and after one of the pulley support pieces 210 is installed into the main body piece 100, the pulley support piece 210 can be inclined by utilizing the inclined surface structure, so that the other pulley support piece 210 is easier to be installed into the main body piece 100, and the assembly of the hanging pulley is facilitated.

As shown in fig. 3 and 4, in some embodiments of the present utility model, the limiting member 300 is detachably mounted to the main body member 100 by a fastening screw 310 or a bolt assembly, and a gap is formed between the limiting member 300 and a groove wall of the limiting groove, so as to facilitate the installation of the fastening screw 310 or the bolt assembly pair Ji Kongwei and the assembly of the hanging pulley.

Specifically, the limiting piece 300 is provided with the counter bore 301, the main part piece 100 is provided with the screw hole 102 that corresponds with the fastening screw 310, when the limiting piece 300 is packed into the spacing groove, owing to there is the clearance, the limiting piece 300 can be moved in a small range, the fastening screw 310 is convenient to pass behind the counter bore 301 and align the screw hole 102, owing to actual installation space is less, through above-mentioned structure, the assembly of hanging the pulley can be conveniently carried out, the fastening screw 310 is from upward installation, when the pulley is hung in the dismouting, can be at the convenient dismouting fastening screw 310 of the opening part of guide rail.

It is contemplated that in some embodiments of the present utility model, the upper portion of the body member 100 may be detachably mounted with a damper positioning member 400 to form a fit with a damper 410 in a guide rail 420 to perform a damping function of the moving door.

Specifically, as shown in fig. 2 and 8, the damper 410 is preloaded in the guide rail 420, the damper positioning member 400 is fixed on the upper portion of the main body member 100 by a screw, a protrusion for matching with the damper 410 is provided on the upper portion of the damper positioning member 400, the hanging pulley is mounted in the guide rail 420, when the hanging pulley moves to a set buffering position, the protrusion on the upper portion of the damper positioning member 400 can trigger and connect the damper 410 to slow down the impact of the door body to the door frame, and the damper positioning member 400 can be selected according to the requirement by detachably configuring the damper positioning member 400, for example, the damper positioning member 400 can not be mounted in a moving door without the damper or on the hanging pulley not contacting with the damper, so as to meet different use requirements.

It will be appreciated that in some embodiments of the present utility model, the damper positioning member 400 may be directly formed on the upper portion of the main body member 100, i.e. integrally formed with the main body member 100, or the damper positioning member 400 may be mounted to the upper portion of the main body member 100 by a snap-fit structure or an insert structure, which is also capable of satisfying the function of being matched with the damper.

It is contemplated that in some embodiments of the present utility model, the hanging pulley mechanism further includes a hanger body 500 for mating connection with the door body 900, the hanger body 500 being mounted to the main body member 100 and/or the spacing member 300 by a screw mechanism, the hanger body 500 being configured with an expansion structure.

Specifically, as shown in fig. 8, the hanging member body 500 can be slidably installed into the hanging member installation groove 901 of the door body 900, the hanging member body 500 is configured with an expansion structure, and the expansion structure can expand and squeeze the groove wall of the hanging member installation groove 901, so that the hanging member body 500 is positioned in the hanging member installation groove 901, the connection of the hanging pulley and the door body 900 is realized, and the assembly connection is convenient and quick.

It is understood that in some embodiments of the present utility model, the hanger body 500 may be coupled to the door body 900 by other mounting mechanisms, such as by a hanging structure, a screw securing mechanism, etc.

As shown in fig. 4 and 7, in some embodiments of the present utility model, a hanger body 500 is provided with an expansion groove 501, and an expansion structure includes an expansion press block 510 provided in the expansion groove 501 and a tip screw 520 provided in the hanger body 500 through a screw-fit, the expansion press block 510 is provided with a partition groove 511, and an end of the tip screw 520 can be screwed into the partition groove 511 to prop up the expansion press block 510, so that the expansion press block 510 partially protrudes out of the hanger body 500 and abuts against a wall of the hanger installation groove 901, thereby realizing connection fixation of the hanger body 500 and the door body 900.

Specifically, the expansion press block 510 is an elastic member such as a rubber block, and can be inserted into the separation groove 511 by the end of the tip screw 520 to press and open the expansion press block 510, and when the tip screw 520 is unscrewed, the expansion press block 510 can automatically recover the initial shape, so that the pendant body 500 can be conveniently separated from the door body 900.

As shown in fig. 7, in some embodiments of the present utility model, the opening position of the separation groove 511 is a bell mouth structure to facilitate the insertion of the end of the tip screw 520.

In some embodiments of the present utility model, as shown in fig. 7, an expansion block 510 is mounted in expansion tank 501 using a pin 530.

Specifically, the expansion press block 510 is provided with a through hole corresponding to the bolt 530, the pendant body 500 is provided with a bolt hole corresponding to the bolt 530, and after the expansion press block 510 is installed in the expansion tank 501, the bolt 530 can be inserted into the expansion tank 501 through the bolt hole and pass through the through hole on the expansion press block 510 to be penetrated out, so that the expansion press block 510 is positioned in the expansion tank 501.

It is contemplated that in some embodiments of the present utility model, expansion press block 510 may also be single sided adhesively secured within expansion tank 501.

As shown in fig. 7, in some embodiments of the present utility model, the screw mechanism includes a hanger screw 540, where the hanger screw 540 passes through the hanger body 500 and is connected with the limiting member 300 in a threaded fit manner, and the main body member 100 is provided with the avoiding hole 103 corresponding to the hanger screw 540, and in use, the hanger screw 540 can be rotated to adjust the height of the hanger body 500, thereby adjusting the height position of the door 900.

It will be appreciated that in some embodiments of the present utility model, the hanger screw 540 may also be coupled to the body member 100 by a threaded engagement, which is not described in detail herein.

The sliding door system according to the second aspect of the present utility model, including the hanging pulley mechanism of any one of the above embodiments, can facilitate the installation and use of the sliding door, and can facilitate the maintenance of the following sliding door.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

Of course, the present utility model is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. Hanging pulley mechanism convenient to replace, its characterized in that includes:

a body member;

the pulley assemblies comprise pulley support pieces and rollers arranged on the pulley support pieces, and the two pulley support pieces are oppositely arranged on the main body piece;

the limiting piece, the limiting piece detachable install in the main part, just the limiting piece install in when the main part, the limiting piece with the main part is restricted jointly so that two pulley support piece can't break away from the main part, the limiting piece is followed when the main part is dismantled, two pulley support piece can break away from the main part.

2. The easy-to-replace hanging pulley mechanism according to claim 1, wherein:

the pulley support piece with be provided with unsmooth formula cooperation structure between the main part, the locating part install in when the main part, the locating part can restrict unsmooth formula cooperation structure separation.

3. The easy-to-replace hanging pulley mechanism according to claim 2, wherein:

the concave-convex matching structure comprises a protruding portion of the pulley support piece and a groove formed in the main body piece, one side or two sides of the groove corresponding to the sliding direction of the hanging pulley mechanism are of an opening structure, the protruding portion of the pulley support piece can be clamped into the groove along the sliding direction of the hanging pulley mechanism through the opening structure, a limiting structure is arranged between the limiting piece and the pulley support piece, and the limiting structure can limit the protruding portion of the pulley support piece to move along the sliding direction of the hanging pulley mechanism and limit the pulley support piece to move downwards relative to the main body piece.

4. A hanging pulley mechanism for easy replacement as claimed in claim 3, wherein:

the limiting structure comprises clamping grooves arranged at the bottoms of the pulley support pieces, the two pulley support pieces are oppositely arranged in the main body piece, the two clamping grooves of the two pulley support pieces are matched to form limiting grooves corresponding to the limiting pieces, and the limiting pieces can be clamped into the limiting grooves when mounted to the main body piece so as to limit the protruding portions of the pulley support pieces to move relative to the main body piece along the sliding direction of the hanging pulley mechanism and limit the pulley support pieces to move downwards relative to the main body piece.

5. The easy-to-replace hanging pulley mechanism according to claim 4, wherein:

the groove set up in the middle part of main part spare, the bellying with the groove corresponds the configuration the draw-in groove is kept away from the position department in the middle part of main part spare is provided with the boss, the locating part passes through fastening mechanism detachable install to the main part spare, just the locating part with the boss supports the pressure each other.

6. The easy-to-replace hanging pulley mechanism according to claim 4, wherein:

the limiting piece is detachably mounted to the main body piece through a fastening screw or a bolt assembly, and a gap is reserved between the limiting piece and the groove wall of the limiting groove.

7. The easy-to-replace hanging pulley mechanism according to claim 1, wherein:

the upper part of the main body piece is detachably provided with a damper positioning piece.

8. The easy-to-replace hanging pulley mechanism according to claim 1, wherein:

the hanging pulley mechanism further comprises a hanging body which is used for being matched and connected with the door body, the hanging body is mounted to the main body piece and/or the limiting piece through a screw mechanism, and the hanging body is provided with an expansion structure.

9. The easy-to-replace hanging pulley mechanism according to claim 8, wherein:

the pendant body is provided with the expansion groove, the expansion structure including set up in the expansion briquetting of expansion groove and set up through threaded fit the pointed end screw of pendant body, the expansion briquetting is provided with the separating groove, the tip screw's tip can screw in the separating groove is in order to prop up the expansion briquetting.

10. A sliding door system, comprising: a hanging pulley mechanism as claimed in any one of claims 1 to 9.