CN109972953B

CN109972953B - Pulley for plastic-steel door and window

Info

Publication number: CN109972953B
Application number: CN201910238189.0A
Authority: CN
Inventors: 李双凤; 顾雨彤; 余泽军
Original assignee: Jiangsu Zhuoran Engineering Consulting Co ltd
Current assignee: JIANGSU ZHUORAN ENGINEERING CONSULTING Co.,Ltd.
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2020-11-03
Anticipated expiration: 2039-03-27
Also published as: CN109972953A

Abstract

The invention relates to the field of door and window assemblies, in particular to a pulley for a plastic-steel door and window, which comprises two first adjusting mechanisms, a guide mechanism, a second adjusting mechanism, a collecting tank and an aligning mechanism, wherein the guide mechanism is arranged at the bottom end of the first adjusting mechanism, the guide mechanism comprises a guide wheel, two ball bearings, a guide shaft and a support, the support for supporting is fixed at the bottom end of the first adjusting mechanism, the support is connected with the first adjusting mechanism through a screw, the two ball bearings are symmetrically embedded into the support, the guide shaft of a cylindrical structure is rotatably connected with the support through the ball bearings, the guide shaft is connected with the guide wheel and the ball bearings in a penetrating manner, and the guide wheel is used for rolling on the door and window. The plastic-steel door and window pulley provided by the invention has the advantages of flexible operation, convenience in installation and convenience in scrap disposal.

Description

Pulley for plastic-steel door and window

Technical Field

The invention relates to the field of door and window assemblies, in particular to a pulley for a plastic-steel door and window.

Background

The plastic-steel door and window is made up by using polyvinyl chloride (UPVC) resin as main raw material, adding a certain proportion of stabilizing agent, colouring agent, filling agent and UV-absorbing agent, extruding and forming to obtain material, then making door and window frame sash by means of cutting, welding or screw-connecting mode, and guiding the joint of door and window and frame by means of pulley so as to make the door and window slide more smoothly and use more flexibly.

However, the fixed specification of the traditional plastic-steel door and window pulley can only be used in doors and windows with fixed thickness, the pulley is not convenient enough when being purchased and installed, and the pulley is in close contact with the guide rail, so that the waste scraps in the guide rail are inconvenient to clean. In view of this, the invention provides a pulley for plastic-steel doors and windows, which has the following characteristics:

(1) according to the pulley for the plastic-steel door and window, the first adjusting mechanisms are arranged at the bottom ends of the two supporting plates on the same plane, the supports for fixing the guide wheels are arranged at the bottom ends of the first adjusting mechanisms, the reference hole in one supporting plate is in sliding connection with the reference rod of the cylindrical structure in the other supporting plate, the distance between the two supporting plates can be conveniently adjusted, the distance between the two guide wheels can be conveniently adjusted, the two supporting plates can be conveniently fixed on doors and windows with different thicknesses, the purchasing and installing requirements are reduced, and the installing efficiency and the quality of the pulley are greatly improved.

(2) According to the pulley for the plastic-steel doors and windows, the collecting groove for cleaning and removing scraps is formed by enclosing the two guide wheels, so that scraps in the guide rail can be conveniently cleaned, excessive contact of the scraps with the guide wheels is avoided, and the guide wheels and the doors and windows are effectively protected.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a pulley for a plastic-steel door window, which comprises two first adjusting mechanisms, a guide mechanism, a second adjusting mechanism, a collecting tank and an alignment mechanism, wherein the guide mechanism is arranged at the bottom end of the first adjusting mechanism and comprises a guide wheel, two ball bearings, a guide shaft and a support, the support for supporting is fixed at the bottom end of the first adjusting mechanism, the support is connected with the first adjusting mechanism through a screw, the two ball bearings are symmetrically embedded into the support, the guide shaft of a cylindrical structure is rotatably connected with the support through the ball bearings, the guide shaft is connected with the guide wheel and the ball bearings in a penetrating manner, and the guide wheel is used for rolling on the door window; the second adjusting mechanism is arranged at the top end of the first adjusting mechanism, the first adjusting mechanism is used for adjusting the distance between the second adjusting mechanism and the guide mechanism, the second adjusting mechanism is used for adjusting the width, the second adjusting mechanism comprises a supporting plate, a plurality of reference rods and reference holes in one-to-one correspondence with the reference rods, the supporting plate for adjusting the width is fixed at the top end of the first adjusting mechanism, a plurality of cylindrical reference rods and reference holes in one-to-one correspondence with the reference rods are linearly distributed at opposite ends of the two supporting plates respectively, the reference rods are in clearance fit with the reference holes, and the reference rods are inserted in the reference holes in a sliding manner; the collecting groove is located two for the dandruff the between the leading wheel, the benchmark pole links firmly with aligning gear, the spacing groove is installed inside the backup pad, the spacing inslot portion is provided with the disc, the disc runs through and is equipped with the guide bar, the guide bar both ends have linked firmly the annular slab, the contact site of disc and guide bar has been seted up and has been put the thing groove, it is equipped with the steel ball to put thing inslot portion, spacing groove one side has linked firmly the retaining ring, and when benchmark pole and benchmark hole can't aim at the time after production, can drive the benchmark pole, and the benchmark pole drives the disc and moves on the guide bar, also can rotate the benchmark pole, drives the disc at the spacing inslot internal rotation, can realize the benchmark pole and remove in the plane of perpendicular backup pad, makes things convenient for the benchmark pole to insert.

Specifically, the opposite ends of the supporting plates of the two rectangular structures are vertically fixed with the rectangular structures for positioning the door and window, the supporting plates are welded with the reference plates, the stability between the supporting plates and the reference plates is improved, the width of the reference plates is equal to that of the supporting plates, and the structure is more stable.

Specifically, the first adjusting mechanism comprises a guide frame and a moving block, the guide frame is of a square frame structure with an opening at the lower side, the guide frame is fixed at one end, away from the reference plate, of the support plate, the guide frame is welded with the support plate, the moving block is of a rectangular structure corresponding to the guide frame and is used for adjusting the installation height, the moving block is slidably connected with the guide frame, one end, away from the support plate, of the moving block is fixed on the support, the moving block is welded with the support, the stability between the moving block and the support is improved, the guiding effect is achieved, and meanwhile, the installation height is adjusted, so that the application range of the first adjusting mechanism is wider.

Specifically, the length of side of the short side of guide frame is less than the length of side of the short side of backup pad, just the edges and corners department of movable block is the quarter cylinder structure, and threaded connection has the bolt on the guide frame, and the tip and the movable block of bolt rotate to be connected, and the bolt is used for driving the movable block and removes, twists the bolt on the guide frame, the bolt drive the movable block is in the inside of guide frame slides, works as when the leading wheel contradicts the slide rail, twists the bolt will the guide frame with the movable block is fixed to be convenient for adjust the distance between leading wheel and the door and window, be convenient for adjust door and window level, reduced door and window's preparation precision.

Specifically, the first adjusting mechanism further comprises a return spring, the return spring is embedded into the moving block, and one end of the return spring, which is far away from the moving block, is fixed to the guide frame, so that the moving block is reset conveniently; in this embodiment, the first adjusting mechanism further includes a groove, the groove having a rectangular structure is disposed at an end of the moving block away from the collecting groove, so as to prevent the moving block from being damaged when the moving block is fixed.

Specifically, two cleaning knives for removing scraps are symmetrically arranged on the side wall of each moving block, and the cleaning knives corresponding to the two moving blocks one by one are arc-shaped structures with gradually increasing radians from the side departing from the collecting groove to the side close to the collecting groove.

Specifically, the vertical distance from the bottom end of the cleaning knife to the bottom surface of the moving block is smaller than the vertical distance from the bottom end of the guide wheel to the bottom surface of the moving block, the cleaning knife is detachably connected with the moving block, one of a bolt connection, a pin connection or a key connection can be performed between the moving block and the cleaning knife so as to facilitate the detachment and installation of the cleaning knife, meanwhile, the collecting tank for cleaning and removing scraps is enclosed between the two guide wheels, an arc-shaped structure is formed in the moving block, the radian of the arc-shaped structure gradually increases from the collecting tank to the position close to the collecting tank, the cleaning knife shovels scraps into the guide rail at the bottom end of the collecting tank, the scraps in the guide rail are convenient to clean, meanwhile, excessive contact of the scraps with the guide wheel is avoided, and the guide wheel and doors and windows are effectively protected.

The invention has the beneficial effects that:

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of a pulley for plastic-steel doors and windows according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the adjustment mechanism number one shown in FIG. 1;

FIG. 3 is a top view of the adjustment mechanism number one shown in FIG. 2;

FIG. 4 is a schematic structural diagram of the second adjustment mechanism shown in FIG. 1;

FIG. 5 is a schematic structural view of an alignment mechanism of the present invention;

fig. 6 is a side cross-sectional view of the storage tray shown in fig. 5.

Reference numbers in the figures: 1. the device comprises a guide mechanism, 11, a guide wheel, 12, a ball bearing, 13, a guide shaft, 14, a support, 2, a first adjusting mechanism, 21, a guide frame, 22, a return spring, 23, a moving block, 24, a groove, 3, a reference plate, 4, a second adjusting mechanism, 41, a support plate, 42, a reference rod, 43, a reference hole, 5, a collecting groove, 6, a cleaning knife, 7, an alignment mechanism, 71, a limiting groove, 72, a disc, 73, a guide rod, 74, a ring plate, 75, a storage groove, 76, a steel ball, 77 and a retainer ring.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1, 4, 5 and 6, the pulley for plastic-steel doors and windows of the present invention comprises two first adjusting mechanisms 2, a guiding mechanism 1, a second adjusting mechanism 4, a collecting trough 5 and an aligning mechanism 7, the guide mechanism 1 is arranged at the bottom end of the first adjusting mechanism 2, the guide mechanism 1 comprises a guide wheel 11, two ball bearings 12, a guide shaft 13 and a bracket 14, the support 14 for supporting is fixed at the bottom end of the first adjusting mechanism 2, the support 14 is connected with the first adjusting mechanism 2 through screws, the two ball bearings 12 are symmetrically embedded into the support 14, the guide shaft 13 with a cylindrical structure is rotatably connected with the support 14 through the ball bearings 12, the guide shaft 13 is connected with the guide wheel 11 and the ball bearing 12 in a penetrating way, and the guide wheel 11 is used for rolling on a door or a window; the second adjusting mechanism 4 is arranged at the top end of the first adjusting mechanism 2, the first adjusting mechanism 2 is used for adjusting the distance between the second adjusting mechanism 4 and the guide mechanism 1, the second adjusting mechanism 4 is used for adjusting the width, the second adjusting mechanism 4 comprises a supporting plate 41, a plurality of reference rods 42 and reference holes 43 corresponding to the reference rods 42 one by one, the supporting plate 41 used for adjusting the width is fixed at the top end of the first adjusting mechanism 2, a plurality of cylindrical reference rods 42 and reference holes 43 corresponding to the reference rods 42 one by one are respectively and linearly distributed at the opposite ends of the two supporting plates 41, the reference rods 42 are in clearance fit with the reference holes 43, and the reference rods 42 are inserted in the reference holes 43 in a sliding manner; the collecting groove 5 for removing the scraps is arranged between the two guide wheels 11; the reference rod 42 is fixedly connected with the alignment mechanism 7, the alignment mechanism comprises a limiting groove 71, a disc 72, a guide rod 73, an annular plate 74, an object placing groove 75, a steel ball 76 and a retainer ring 77, the limiting groove 71 is installed inside the support plate 41, the disc 72 is arranged inside the limiting groove 71, the guide rod 73 penetrates through the disc 72, the annular plate 74 is fixedly connected to two ends of the guide rod 73, the object placing groove 75 is formed in a contact position of the disc 72 and the guide rod 73, the steel ball 76 is arranged inside the object placing groove 75, the retainer ring 77 is fixedly connected to one side of the limiting groove 71, when the reference rod 42 and the reference hole 43 cannot be aligned after production, the reference rod 42 can be driven, the disc 72 is driven by the reference rod 42 to move on the guide rod 73, the reference rod 42 can also be rotated, the disc 72 is driven to rotate in the limiting groove 75, and the reference rod 42 can move in a plane, facilitating insertion of the reference bar 42 into the reference hole 43.

Specifically, as shown in fig. 1 and 4, in the pulley for plastic-steel doors and windows according to the present invention, the reference plates 3 of rectangular structures for positioning doors and windows are vertically fixed to opposite ends of the support plates 41 of two rectangular structures, the support plates 41 are welded to the reference plates 3 to increase stability between the support plates 41 and the reference plates 3, and the reference plates 3 and the support plates 41 have the same width, so as to make the structure more stable.

Specifically, as shown in fig. 2 and 3, the first adjusting mechanism 2 includes a guide frame 21 and a moving block 23, the guide frame 21 is a square frame structure with an opening at a lower side, the guide frame 21 is fixed at one end of the support plate 41 away from the reference plate 3, the guide frame 21 is welded with the support plate 41, the moving block 23 is a rectangular structure corresponding to the guide frame 21, the moving block 23 used for adjusting the installation height is slidably connected with the guide frame 21, one end of the moving block 23 away from the support plate 41 is fixed on the support 14, and the moving block 23 is welded with the support 14 to increase the stability between the moving block 23 and the support 14, so as to achieve a guiding effect and adjust the installation height, so that the application range of the pulley is wider.

Specifically, as shown in fig. 2 and 3, according to the pulley for the plastic-steel door and window, the side length of the short side of the guide frame 21 is smaller than that of the short side of the support plate 41, the edge of the moving block 23 is of a quarter-cylinder structure, a bolt is connected to the guide frame 21 in a threaded manner, the end of the bolt is rotatably connected to the moving block 23, the bolt is used for driving the moving block 23 to move, the bolt on the guide frame 21 is screwed, the bolt drives the moving block 23 to slide inside the guide frame 21, and when the guide wheel 11 abuts against the slide rail, the bolt is screwed to fix the guide frame 21 and the moving block 23, so that the distance between the guide wheel 11 and the door and window can be conveniently adjusted, the door and window level can be conveniently adjusted, and the manufacturing accuracy of the door and window is reduced.

Specifically, as shown in fig. 2 and 3, the first adjusting mechanism 2 further includes a return spring 22, the return spring 22 is embedded in the moving block 23, and one end of the return spring 22, which is away from the moving block 23, is fixed to the guide frame 21, so as to facilitate the return of the moving block 23; in this embodiment, the first adjusting mechanism 2 further includes a groove 24, and the groove 24 having a rectangular structure is disposed at an end of the moving block 23 away from the collecting groove 5, so as to prevent the moving block 23 from being damaged when the moving block 23 is fixed.

Specifically, as shown in fig. 1, fig. 2 and fig. 3, according to the pulley for plastic-steel doors and windows, two cleaning knives 6 for removing scraps are symmetrically arranged on the side wall of the moving block 23, and the cleaning knives 6 corresponding to the two moving blocks 23 one by one are of arc-shaped structures, the radian of which increases gradually from the direction departing from the collecting tank 5 to the direction close to the collecting tank 5.

Specifically, as shown in fig. 1 and 2, in the pulley for plastic-steel doors and windows according to the present invention, a vertical distance from a bottom end of the cleaning blade 6 to a bottom surface of the moving block 23 is less than a vertical distance from a bottom end of the guide wheel 11 to a bottom surface of the moving block 23, the cleaning blade 6 is detachably connected to the moving block 23, one of a bolt connection, a pin connection or a key connection is available between the moving block 23 and the cleaning blade 6, so as to facilitate detachment and installation of the cleaning blade 6, the two guide wheels 11 enclose the collecting tank 5 for cleaning and removing scraps, the arc structure on the moving block 23 is gradually increased from a position departing from the collecting tank 5 to a position close to the collecting tank 5, the cleaning blade 6 shovels the scraps into the guide rail at the bottom end of the collecting tank 5, so as to facilitate cleaning the scraps in the guide rail, and simultaneously avoid excessive contact of the scraps with the guide wheels 11, the guide wheels 11 and the door and window are effectively protected.

The working principle of the pulley for the plastic-steel door and window provided by the invention is as follows:

firstly, two reference plates 3 are symmetrically fixed on two sides of a door window respectively, two support plates 41 move relatively, a reference hole 43 on one support plate 41 is in sliding connection with a reference rod 42 of a cylindrical structure on the other support plate 41, so that the distance between the two support plates 41 is convenient to adjust, the distance between the two guide wheels 11 is convenient to adjust, the two support plates 41 are convenient to be fixed on the door window with different thicknesses, the requirement of purchasing and installing is reduced, the installing efficiency and the quality of the pulley are greatly improved, a bolt on the guide frame 21 is screwed, the return spring 22 drives the moving block 23 to slide in the guide frame 21, when the guide wheel 11 is abutted against a slide rail, the bolt is screwed to fix the guide frame 21 and the moving block 23, so that the distance between the guide wheel 11 and the door window is convenient to adjust, the door and window leveling is convenient to adjust, the manufacturing precision of the door and window is reduced, when the reference rod 42 and the reference hole 43 cannot be aligned after production, the reference rod 42 can be driven, the reference rod 42 drives the disc 72 to move on the guide rod 73, the reference rod 42 can also be rotated to drive the disc 72 to rotate in the limiting groove 75, the reference rod 42 can move in the plane of the vertical supporting plate 41, the reference rod 42 is conveniently inserted into the reference hole 43, meanwhile, the collecting groove 5 for cleaning and removing scraps is enclosed between the two guide wheels 11, the arc-shaped structure with the gradually increasing radian from the collecting groove 5 to the position close to the collecting groove 5 is arranged on the moving block 23, the cleaning knife 6 for sliding the door and window shovels the scraps into the guide rail at the bottom end of the collecting groove 5, the scraps in the guide rail can be cleaned conveniently, and excessive contact of the scraps with the guide wheels 11 is avoided, the guide wheels 11 and the door and window are effectively protected.

The invention provides a pulley for plastic-steel doors and windows, the bottom ends of two support plates 41 on the same plane are both provided with a first adjusting mechanism 2, the bottom end of the first adjusting mechanism 2 is provided with a bracket 14 for fixing guide wheels 11, a reference hole 43 on one support plate 41 is in sliding connection with a reference rod 42 of a cylindrical structure on the other support plate 41, the distance between the two support plates 41 is convenient to adjust, so that the distance between the two guide wheels 11 is adjusted, the two support plates 41 are convenient to be fixed on doors and windows with different thicknesses, the requirement of purchasing and installation is reduced, the installation efficiency and the quality of the pulley are greatly improved, meanwhile, a collecting groove 5 for cleaning and removing scraps is enclosed between the two guide wheels 11, the scrap inside a guide rail is convenient to clean, and the excessive contact of the scrap and the guide wheels 11 is avoided, the guide wheels 11 and the door and window are effectively protected.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a pulley for moulding steel door and window which characterized in that: the device comprises two first adjusting mechanisms (2), a guide mechanism (1), a second adjusting mechanism (4), a collecting tank (5) and an aligning mechanism (7), wherein the guide mechanism (1) is arranged at the bottom end of the first adjusting mechanism (2), the guide mechanism (1) comprises a guide wheel (11), two ball bearings (12), a guide shaft (13) and a support (14) and is used for supporting the support (14) which is fixed at the bottom end of the first adjusting mechanism (2), the support (14) is connected with the first adjusting mechanism (2) through screws, the two ball bearings (12) are symmetrically embedded into the support (14), the guide shaft (13) of a cylindrical structure is rotatably connected between the ball bearings (12) and the support (14), and the guide shaft (13) is connected with the guide wheel (11) and the ball bearings (12) in a penetrating manner, the guide wheels (11) are used for rolling on the door and the window; the second adjusting mechanism (4) is arranged at the top end of the first adjusting mechanism (2), the first adjusting mechanism (2) is used for adjusting the distance between the second adjusting mechanism (4) and the guide mechanism (1), the second adjusting mechanism (4) is used for adjusting the width, the second adjusting mechanism (4) comprises a supporting plate (41), a plurality of reference rods (42) and reference holes (43) which are in one-to-one correspondence with the reference rods (42), the supporting plates (41) used for adjusting the width are fixed at the top ends of the first adjusting mechanisms (2), a plurality of reference rods (42) with cylindrical structures and reference holes (43) corresponding to the reference rods (42) one by one are linearly distributed at the opposite ends of the two supporting plates (41), the reference rods (42) are in clearance fit with the reference holes (43), and the reference rods (42) are inserted in the reference holes (43) in a sliding mode; the collecting groove (5) used for removing scraps is arranged between the two guide wheels (11), the reference rod (42) is fixedly connected with the aligning mechanism (7), the aligning mechanism comprises a limiting groove (71), a disc (72), a guide rod (73), an annular plate (74), an object placing groove (75), a steel ball (76) and a retainer ring (77), the limiting groove (71) is installed inside the supporting plate (41), the disc (72) is arranged inside the limiting groove (71), the disc (72) penetrates through the guide rod (73), the annular plate (74) is fixedly connected to two ends of the guide rod (73), the object placing groove (75) is formed in the contact part of the disc (72) and the guide rod (73), the steel ball (76) is arranged inside the object placing groove (75), and the retainer ring (77) is fixedly connected to one side of the limiting groove (71);

when the reference rod (42) and the reference hole (43) cannot be aligned after production, the reference rod (42) can be driven, the reference rod (42) drives the disc (72) to move on the guide rod (73), the reference rod (42) can also be rotated, the disc (72) is driven to rotate in the limiting groove (75), the reference rod (42) can move in the plane vertical to the supporting plate (41), and the reference rod (42) can be conveniently inserted into the reference hole (43).

2. The pulley for plastic-steel doors and windows according to claim 1, wherein: two rectangle structures the back of the body end of backup pad (41) all is fixed with perpendicularly and is used for carrying out the rectangle structure of fixing a position to door and window benchmark board (3), welding between backup pad (41) and benchmark board (3) for increase the stability between backup pad (41) and benchmark board (3), just benchmark board (3) with the width of backup pad (41) equals, in order to make the structure more firm.

3. The pulley for plastic-steel doors and windows according to claim 1, wherein: the first adjusting mechanism (2) comprises a guide frame (21) and a moving block (23), the guide frame (21) is of a square frame structure with an opening at the lower side, the guide frame (21) is fixed at one end, away from the reference plate (3), of the support plate (41), the guide frame (21) and the support plate (41) are welded, the moving block (23) is of a rectangular structure corresponding to the guide frame (21) and used for adjusting the installation height, the moving block (23) is connected with the guide frame (21) in a sliding mode, one end, away from the support plate (41), of the moving block (23) is fixed on the support (14), and the moving block (23) is welded with the support (14) and used for increasing the stability between the moving block (23) and the support (14), achieving a guiding effect and adjusting the installation height.

4. The pulley for plastic-steel doors and windows according to claim 3, wherein: the side length of the short side of the guide frame (21) is smaller than that of the short side of the support plate (41), the edge of the moving block (23) is of a quarter cylinder structure, a bolt is connected to the guide frame (21) in a threaded mode, the end portion of the bolt is rotatably connected with the moving block (23), and the bolt is used for driving the moving block (23) to move.

5. The pulley for plastic-steel doors and windows according to claim 3, wherein: the first adjusting mechanism (2) further comprises a return spring (22), the return spring (22) is embedded into the moving block (23), one end, deviating from the moving block (23), of the return spring (22) is fixed to the guide frame (21), and the return spring (22) is convenient to reset the moving block (23).

6. The pulley for plastic-steel doors and windows according to claim 3, wherein: the first adjusting mechanism (2) further comprises a groove (24), the groove (24) of the rectangular structure is formed in one end, away from the collecting groove (5), of the moving block (23), and the moving block (23) is prevented from being damaged when the moving block (23) is fixed.

7. The pulley for plastic-steel doors and windows according to claim 3, wherein: two cleaning knives (6) used for removing scraps are symmetrically arranged on the side walls of the moving blocks (23), and the cleaning knives (6) which are in one-to-one correspondence to the two moving blocks (23) are of arc-shaped structures with gradually increased radians from the position departing from the collecting groove (5) to the position close to the collecting groove (5).

8. The pulley for plastic-steel doors and windows according to claim 7, wherein: the vertical distance from the bottom end of the cleaning knife (6) to the bottom surface of the moving block (23) is smaller than the vertical distance from the bottom end of the guide wheel (11) to the bottom surface of the moving block (23), the cleaning knife (6) is detachably connected with the moving block (23), the moving block (23) and the cleaning knife (6) can be connected in one mode of bolt connection, pin connection or key connection, so that the cleaning knife (6) can be conveniently detached and installed, meanwhile, the collecting tank (5) for cleaning and removing scraps is enclosed between the two guide wheels (11), the moving block (23) is provided with an arc structure with the radian gradually increasing from the position deviating from the collecting tank (5) to the position close to the collecting tank (5), and the cleaning knife (6) shovels the scraps into a guide rail at the bottom end of the collecting tank (5).