Blade replacement facilitates cleaning scrapers

Abstract

A cleaning scraper that facilitates blade replacement, characterized in that it includes the following: a scraper body (1) wherein a blade slot (12) for attaching a blade (6) is formed on the scraper body (1); a pair of end caps (2), wherein the end caps (2) are arranged at both ends of the scraper body (1), while at least one end cap (2) has a blade passage opening (21), wherein the lateral insertion opening of the blade slot (12) is oriented towards the blade passage opening (21); at least one cover plate (4) which is rotatably arranged within the blade passage opening (21), wherein the cover plate (4) has an open position and a closed position within the blade passage opening (21), wherein the lateral insertion opening of the blade slot (12) opens when the cover plate (4) is rotated into the open position, and the cover plate (4) closes the lateral insertion opening of the blade slot (12) when the cover plate (4) is rotated into the closed position.

Description

Technical field

[0001] The present utility model relates to the field of construction tools, in particular cleaning scrapers that facilitate blade replacement. Background technology

[0002] During the plastering phase of wall construction, a plaster scraper is needed to smooth a plaster mixture (including cement, lime plaster, adhesive mortar, etc.) evenly on the wall surface.

[0003] A cleaning scraper consists of a blade holder, a blade, and two end caps. The blade holder has a slot into which the blade's mounting end is inserted. The working end of the blade extends beyond the blade holder. The two end caps are attached to either end of the blade holder and cover the side of the blade within the slot, preventing it from slipping out of the holder.

[0004] Blades are consumable parts. Their working end wears down after prolonged use, and therefore blades need to be replaced frequently. Previously, replacing a blade required first removing an end cap, then pulling the old blade out sideways, inserting the new blade, and finally replacing the end cap.

[0005] To facilitate blade replacement, improvements were made to the end cap of the plastering scraper. A cover plate, secured with a locking screw, was integrated into the end cap to allow for a removable connection. After removing the cover plate, the blade can be easily pulled out. When mounted on the blade holder, the cover plate serves as lateral protection and helps position the blade. For further details, see patent: CN211313262U - Gripping mechanism for a scraper and specially shaped scraper for building decoration.

[0006] The previous fastening system for the cover plate, which was attached to the end cap with locking screws, proved cumbersome to disassemble. The entire screw assembly had to be unscrewed before the cover plate could be removed. This design presented two significant problems: First, the removed cover plate and screws could easily be misplaced, and second, the protruding screw heads obstructed the function of the cleaning scraper when the cover plate was screwed to the end cap.

[0007] In summary, the current design of the cover plate on the plaster scraper results in inefficient assembly and disassembly, which impairs the efficiency of blade replacement. Content of the utility model

[0008] The technical problem solved by the present utility model is to overcome the disadvantages of the existing technology by providing a blade-changing-friendly cleaning scraper, thereby eliminating the current inefficiency in replacing the blade of conventional cleaning scrapers.

[0009] The technical solution claimed by the present utility model to solve the technical problem consists of, whereby A blade-changing cleaning scraper is provided, which includes the following: a scraper body, wherein a blade slot is formed on the scraper body for attaching a blade; a pair of end caps, wherein the end caps are arranged at both ends of the scraper body, while at least one end cap has a blade passage opening, wherein the lateral insertion opening of the blade slot is oriented towards the blade passage opening; at least one cover plate, rotatably arranged within the blade passage opening, wherein the cover plate has an open position and a closed position within the blade passage opening, wherein the lateral insertion opening of the blade slot opens when the cover plate is rotated into the open position, and the cover plate closes the lateral insertion opening of the blade slot when the cover plate is rotated into the closed position.

[0010] Furthermore, a rotating structure of the cover plate within the blade passage opening comprises the following: a sliding chamber formed on the end cover, wherein an insertion opening is formed at the front end of the sliding chamber and the sliding chamber is connected to the blade passage opening via the insertion opening, wherein the insertion opening is provided with a notch in order not to impede the opening of the cover plate, wherein the cover plate comprises a plug-in section and a cover section, the plug-in section extending through the insertion opening into the sliding space and a pivot shaft being provided on both sides of the inner end of the plug-in section, the pivot shaft being designed for vertical and rotary movement within the sliding space and enabling the cover plate to open and close when the pivot shaft reaches the lower position of the sliding space, the cover plate (4) being designed to drive the pivot shaft (43) and move it into the lower position of the sliding space when the cover plate opens, while simultaneously pivoting the plug-in section into the notch, the cover plate being designed to drive the pivot shaft and move it into the upper position of the sliding space when the cover plate closes.

[0011] Furthermore, a locking projection is provided on the cover section, while a locking recess is formed on the side wall of the blade passage opening, with the locking projection simultaneously engaging in the locking recess when the rotating shaft moves into the upper position within the sliding space.

[0012] Furthermore, an inclined surface is formed on the inside of the notch on the end cap, the inclined surface being designed so that it engages with the cover plate in its open state and thereby increases the opening angle of the cover plate.

[0013] Furthermore, a connecting groove is formed on the surface of the mounting side of the end cap, wherein the sliding space is formed between the connecting groove and the scraper body when the end cap is connected to the scraper body.

[0014] Furthermore, a rotating structure of the cover plate within the blade passage opening comprises the following: a pair of wave bores, wherein the two wave bores are each formed at one of the two ends of the inside of the blade passage opening, wherein the cover plate is provided with a pair of pivot pins, wherein the two pivot pins are each inserted into the shaft bore, whereby the cover plate is rotatably mounted within the blade passage opening; a clamping structure that is arranged between the cover plate and the end cap, a snap connection is created between the cover plate and the end cap, which secures the cover plate in the closed position when the cover plate rotates into the closed position.

[0015] Furthermore, the blade passage opening represents a stepped groove, wherein the inner surface of the cover plate forms a stepped surface that fits with the stepped groove, with an inner projection formed at the lower end of the inner surface of the cover plate. the inner projection is located in front of the lateral insertion opening of the blade slot when the cover plate is in the closed position.

[0016] Furthermore, the clamping structure comprises a clamping groove and a clamping projection, the clamping groove being provided on the end cap or cover plate, the clamping projection is provided on the cover plate or the end cap.

[0017] Furthermore, the pivot pin and the cover plate form an integral structure, the pivot pin is provided with a guide chamfer.

[0018] Furthermore, the lower end of the cover plate is provided with a non-slip protrusion.

[0019] The advantageous effects of the present utility model are as follows: By positioning the blade passage opening on the end cap, users can replace the blade directly through the blade passage opening without having to completely remove the end cap, thus increasing the efficiency of blade replacement.

[0020] The cover plate is rotatable on the end cap to facilitate covering the blade opening. Opening and closing the blade opening is extremely easy, allowing for effortless replacement of the cleaning scraper blades. Illustration of the attached drawings

[0021] The present utility model is described in more detail below with reference to the attached drawings. Fig. Figure 1 is a schematic representation of a plaster scraper (with closed cover plate) from embodiment I; Fig. Figure 2 is a schematic representation of a plaster scraper (with open cover plate) from embodiment I; Fig. Figure 3 is a schematic representation of a scraper body from embodiment I; Fig. Figure 4 is a schematic representation of the inside of an end cap from embodiment I; Fig. Figure 5 is a schematic representation of the outside of an end cap from embodiment I; Fig. Figure 6 is a schematic representation of a cover plate from embodiment I; Fig. Figure 7 is a schematic representation of a cover plate from embodiment I, which is located in the end cover; Fig. Figure 8 is a schematic representation of a plaster scraper (without a cover plate) from embodiment I; Fig. Figure 9 is a schematic representation of a cleaning scraper from embodiment II; Fig. 10 is a schematic representation of a plaster scraper (without cover plate) from embodiment II; Fig. 11 is a schematic representation of an end cap from embodiment II; Fig. 12 or Fig. Figure 13 is a schematic representation of a cover plate from embodiment II.

[0022] Included: 1. Scraper body; 11. Rib; 12. Blade slot; 2. End cap; 21. Blade passage opening; 22. Inclined surface; 23. Internal stop block; 241. Stop step; 242. Stop end face; 25. Locking recess; 26. Shaft bore; 31. Inner groove, 32. Outer groove, 33. Notch; 4. Cover plate; 41. Plug-in section; 42. Cover section; 43. Rotating shaft; 44. Anti-slip protrusion; 45. Locking projection; 46. Inner projection; 47. Pivot pin; 48. Guide chamfer; 51. Clamping groove; 52. Clamping projection; 6. Blade. Detailed descriptions

[0023] In order to explain in more detail the technical means and effects that the present utility model employs to achieve its stated objectives, the detailed embodiments, structure, features and effects of the present utility model are set out in the following detailed description, including the attached drawings and preferred embodiments. Example I

[0024] As in the Fig. 1 to Fig. Figure 8 shows a blade-changing cleaning scraper, which includes the following: a scraper body 1, wherein a blade slot 12 is formed on the scraper body 1 for attaching a blade 6; a pair of end caps 2, wherein the end caps 2 are arranged at both ends of the scraper body 1, while at least one end cap 2 has a blade passage opening 21, wherein the lateral insertion opening of the blade slot 12 is oriented towards the blade passage opening 21; at least one cover plate 4, which is rotatably arranged within the blade passage opening 21, wherein the cover plate 4 has an open position and a closed position within the blade passage opening 21, wherein the lateral insertion opening of the blade slot 12 opens when the cover plate 4 is rotated into the open position, and the cover plate 4 closes the lateral insertion opening of the blade slot 12 when the cover plate 4 is rotated into the closed position.

[0025] In this embodiment, the pair of end caps 2 used on the cleaning scraper can comprise two end caps 2, each having a blade passage opening 21, or alternatively, one end cap 2 can have a blade passage opening 21, while the other end cap 2 does not have a blade passage opening 21.

[0026] In this embodiment, the scraper body 1 comprises, as shown in Fig. Figure 3 shows a handle section and a working section, the handle section and the working section forming an integral structure. The scraper body 1 is manufactured as a single part by injection molding or casting. The blade slot 12 is formed in the working section of the scraper body 1.

[0027] In this embodiment, the end cover 2 is attached to the front face of the scraper body 1 by several locking screws.

[0028] In particular, as an alternative embodiment of this embodiment, a rotating structure of the cover plate 4 within the blade passage opening 21 is included, as shown in the Fig. 4 to Fig. 8 shown, the following: a sliding chamber formed on the end cover 2, wherein an insertion opening is formed at the front end of the sliding chamber and the sliding chamber is connected to the blade passage opening 21 via the insertion opening, wherein the insertion opening is provided with a notch 33 in order not to impede the opening of the cover plate 4, wherein the cover plate 4 comprises a plug-in section 41 and a cover section 42, the plug-in section 41 extending through the insertion opening into the sliding space and a rotary shaft 43 being provided on both sides of the inner end of the plug-in section 41, the rotary shaft 43 being designed for vertical and rotary movement within the sliding space. With reference to the orientation in Fig. 1. The cover plate 4 is designed to open and close as the pivot shaft 43 moves into the lower position of the sliding space. When the cover plate 4 opens, the plug-in section 41 pivots into the notch 33. When the cover plate 4 closes, it is designed to drive the pivot shaft 43 into the lower position of the sliding space while simultaneously driving the pivot shaft 43 into the upper position of the sliding space.

[0029] In this embodiment, as in Fig. Figure 6 shows the rotating shaft 43 and the cover plate 4 forming an integral structure.

[0030] In this embodiment, the cover plate 4 has a one-piece T-shaped structure and is manufactured by injection molding. As in Fig. As shown in Figure 6, its horizontal edge forms the cover section 42, while the vertical edge forms the plug connection section 41.

[0031] In particular, as an alternative embodiment of this exemplary embodiment and as described in the Fig. 4 to Fig. Figure 6 shows a locking projection 45 on the cover section 42, while a locking recess 25 is formed on the side wall of the blade passage opening 21, wherein the locking projection 45 engages simultaneously in the locking recess 25 when the pivot shaft 43 on the cover plate 4 moves into the upper position within the sliding space.

[0032] As in Fig. As shown in Figure 7, an interference fit is created between the locking projection 45 and the locking recess 25 when the cover plate 4 is inserted. This ensures that the cover plate 4 is securely locked in place after being inserted into the end cap 2, thus preventing the cover plate 4 from coming loose.

[0033] In this embodiment, the locking projection 45 is a rectangular projection and the locking recess 25 is a corresponding rectangular recess.

[0034] In particular, as an alternative embodiment of this exemplary embodiment, the direction of movement of the cover plate 4 on the end cover 2 coincides with the thickness direction of the blade 6 within the blade slot 12.

[0035] Referring to Fig. 1. The thickness direction of the blade 6 refers to the one in the Fig. 1 Vertical orientation shown. After the cover plate 4 has been folded down to close the blade passage opening 21, the cover plate 4 then slides upwards to be inserted into the end cap 2, thereby creating a snap connection with the end cap 2.

[0036] The direction of rotation or movement of the cover plate 4 on the scraper can be adjusted according to the specific design requirements of the respective plaster scraper.

[0037] In particular, as an alternative embodiment of this exemplary embodiment and as in Fig. 5 shown on the end cover 2 on the inside of the notch 33 a inclined surface 22 is formed, wherein the inclined surface 22 is designed so that it engages with the cover plate 4 in its open state and thereby increases the opening angle of the cover plate 4.

[0038] The normally shaped notch 33 allows the pivot shaft 43 of the cover plate 4 to rotate only 90 degrees when it is positioned in the outer bore. At this point, the blade 6 can still be pulled out of the blade slot 12 as usual, but the cover plate 4 continues to obstruct the blade 6. However, due to the integrated inclined surface 22, the cover plate 4 can pivot further outwards. This changes the pivot angle of the cover plate 4 from 90 degrees to an obtuse angle. The larger the opening of the cover plate 4, the less it impedes the removal of the blade 6.

[0039] In particular, as an alternative embodiment of this exemplary embodiment and as described in the Fig. 4 to Fig. 7 shown a sliding groove is formed on the surface of the mounting side of the end cover 2, wherein the sliding space is formed between the sliding groove and the end face of the scraper body 1 when the end cover 2 is connected to the end face of the scraper body 1.

[0040] This configuration simplifies the design of a sliding space on the scraper. The end cap 2 is firmly screwed to the end face of the scraper body 1. When connecting the end cap 2 to the end face of the scraper body 1, the pivot shaft 43 of the cover plate 4 is first positioned within the sliding groove. After the end cap 2 is assembled, both pivot shafts of the cover plate 4 are thus located within the sliding space.

[0041] As an alternative embodiment of the sliding chamber, the entire sliding chamber can also be formed directly within the end cap 2. That is, the sliding chamber does not rest on the end face of the scraper body 1, but the injection-molded end cap 2 directly encompasses the sliding chamber.

[0042] As in Fig. As shown in Figure 4, the sliding groove on the end cover 2 comprises an inner groove 31 and an outer groove 32. An internal stop block 23 is provided within the inner groove 31. The internal stop block 23 limits the insertion depth of the cover plate 4 within the sliding space. The outer groove 32 has stop steps 241 on both sides, the stop steps 241 being designed to bear against the end of the rotating shaft 43 and thereby prevent the cover plate 4 from being pushed out of the sliding space. A notch 33 is formed in the outer groove 32. The inner groove 31 and the outer groove 32 have stop end faces 242 on both sides. The stop end faces 242 on both sides serve to limit axial displacement at both ends of the rotating shaft. The entire sliding space includes the stop step 241, the stop end faces 242 on both sides, the internal stop block 23 and the end face of the scraper body 1.

[0043] As in Fig. As shown in Figure 7, the cover plate 4 moves into the upper position within the sliding space. At this point, the cover plate 4 rests against the internal stop block 23, with the plug-in section 41 located within the sliding space. Consequently, the cover plate 4 cannot pivot outwards, thus achieving a self-locking state of the cover plate 4.

[0044] As in the Fig. 3 and Fig. Figure 8 shows that in some embodiments, the scraper body 1 is designed with an internal hollow structure supported by several ribs 11 to reduce the manufacturing costs of the scraper. The end edge of the rib 11 forms a flat end face, which in this case serves as one of the inner surfaces of the sliding chamber. Since the pivot shaft 43 of the cover plate 4 is located between the end cap 2 and the scraper body 1, the number of ribs 11 within the scraper body 1 near the cover plate 4 has been increased. The additional ribs 11 serve to bear against the pivot shaft 43 of the cover plate 4. When the cover plate 4 is in the open position, the pivot shaft 43 of the cover plate 4 rests directly against these additional ribs 11.

[0045] In this embodiment, as in Fig. 3 shows the ribs 11 added to the scraper body 1 arranged in a cross-shaped pattern.

[0046] In this embodiment, for the end caps 2 on both sides of the scraper body 1, it is only necessary to form a blade passage opening 21 in the end cap 2 on one side. The end cap 2 on the other side retains the conventional structure of the end cap 2, with the end cap 2 directly covering the blade slot 12 after assembly on the side of the scraper body 1.

[0047] For the cleaning scraper of this embodiment, the following applies when replacing blade 6 (see Fig. First, the cover plate 4 is slid horizontally downwards, allowing the pivot shaft 43 of the plug-in connection section of the cover plate 4 to move from the inner bore to the outer bore. Then, the cover plate 4 is folded upwards, thereby opening the blade passage 21 in the Fig. The device is in the open state shown in Figure 2. The old blade 6 is then pulled out to the left and a new blade 6 is inserted. After the new blade 6 has been inserted into the blade slot 12, the cover plate 4 is folded down to close the blade passage opening 21. The cover plate 4 is then pushed upwards, which moves the pivot shaft 43 of the cover plate 4 into the upper position within the sliding space. This action locks the cover plate 4 itself. Thus, the cover plate 4 effectively limits the movement of the blade 6 within the blade slot 12.

[0048] In this embodiment of the plaster scraper, the cover plate 4 remains permanently attached to the scraper. Opening and closing the cover plate 4 requires no tools, and both operations are extremely simple.

[0049] The cover plate 4 is attached via the connecting structure between the end cap 2 and the scraper body 1. This modification requires only minimal changes to the overall configuration of the cleaning scraper. The end cap 2 merely requires the addition of a blade passage opening 21 and a sliding space, while the scraper body 1 only requires the addition of several ribs 11. Design II

[0050] This embodiment is based on embodiment I, but differs in that the rotary structure of the cover plate 4 within the blade passage opening 21 has been redesigned. The details are as follows: As in the Fig. 9 to Fig. Figure 13 shows a blade-changing cleaning scraper, which includes the following: a scraper body 1, wherein a blade slot 12 is formed on the scraper body 1 for attaching a blade 6; a pair of end caps 2, wherein the end caps 2 are arranged at both ends of the scraper body 1, while at least one end cap 2 has a blade passage opening 21, wherein the lateral insertion opening of the blade slot 12 is oriented towards the blade passage opening 21; a pair of cover plates 4, which are rotatably arranged within the blade passage opening 21, wherein the cover plate 4 has an open position and a closed position within the blade passage opening 21, wherein the lateral insertion opening of the blade slot 12 opens when the cover plate 4 is rotated into the open position, and the cover plate 4 closes the lateral insertion opening of the blade slot 12 when the cover plate 4 is rotated into the closed position.

[0051] In particular, as an alternative embodiment of this embodiment, a rotating structure of the cover plate 4 within the blade passage opening 21 is included, as shown in the Fig. 9 to Fig. 13 shown, the following: a pair of wave bores 26, wherein the two wave bores 26 are each formed at one of the two ends of the inside of the blade passage opening 21, wherein the cover plate 4 is provided with a pair of pivot pins 47, wherein the two pivot pins 47 are each inserted into the shaft bore 26, whereby the cover plate 4 is rotatably mounted within the blade passage opening 21; a clamping structure arranged between the cover plate 4 and the end cover 2, wherein a snap connection is created between the cover plate 4 and the end cap 2, which secures the cover plate 4 in the closed position when the cover plate 4 rotates into the closed position.

[0052] In particular, it presents, as an alternative embodiment of this exemplary embodiment and as in Fig. Figure 11 shows the blade passage opening 21 as a stepped groove, wherein the blade passage opening 21 has a step and the inner surface of the cover plate 4 forms a stepped surface that fits with the stepped groove, wherein an inner projection 46 is formed at the front end of the inner surface of the cover plate 4, wherein the inner projection 46 is located in front of the lateral insertion opening of the blade slot 12 when the cover plate 4 is in the closed position.

[0053] In this embodiment, the end cap 2 engages in the cover plate 4 via the stepped groove, thereby enabling a more stable and reliable fastening structure of the cover plate 4 to the end cap 2.

[0054] In this embodiment, the design of the inner projection 46 allows the cover plate 4 to come into direct contact with the lateral insertion opening when the blade slot 12 is covered by the cover plate 4, thereby ensuring a better fit of the cover plate 4 over the blade slot 12.

[0055] In this embodiment, the rotation angle of the cover plate 4 on the end cap 2 is ≥ 90°. It must be ensured that the free end of the cover plate 4, in the open position of the cover plate 4, does not obstruct the extension and retraction of the blade 6 from the blade slot 12.

[0056] In particular, the clamping structure comprises, as an alternative embodiment of this exemplary embodiment and as described in the Fig. 11 and Fig. Figure 12 shows a clamping groove 51 and a clamping projection 52, wherein the clamping groove 51 is provided on the end cap 2 and the clamping projection 52 is provided on the cover plate 4. When the cover plate 4 rotates into the closed position, the clamping projection 52 engages precisely in the clamping groove 51, thereby fixing the cover plate 4 and limiting its rotation in the closed position.

[0057] In another embodiment, the clamping groove 51 can alternatively be formed on the cover plate 4, wherein the clamping projection 52 is arranged on the end cover 2, thereby achieving identical technical effects.

[0058] In particular, as an alternative embodiment of this exemplary embodiment and as described in the Fig. 12 and Fig. Figure 13 shows the pivot pin 47 and the cover plate 4 forming an integral structure, wherein the pivot pin 47 is provided with a guide chamfer 48.

[0059] The design of the guide chamfer 48 facilitates pressing the cover plate 4 into the blade passage opening 21. Since the blade passage opening 21 is a stepped groove, the cover plate 4 fits completely into this opening. During assembly, the cover plate 4 is pressed into the blade passage opening 21. If the pivot pin 47 were cylindrical, pressing it in would be difficult. The integration of the guide chamfer 48 on the pivot pin 47 now facilitates the installation of the cover plate 4 into the blade passage opening 21. Furthermore, the shaft bore 26 within the blade passage opening 21 is designed as a long slotted hole to facilitate the insertion of the cover plate 4.

[0060] In particular, as an alternative embodiment of this exemplary embodiment and as in Fig.Figure 12 shows the lower end of the cover plate 4 provided with a non-slip protrusion 44.

[0061] The non-slip protrusion 44 makes it easier for the operator to open the cover plate 4 from its closed position. When the cover plate 4 is in the closed position, the non-slip protrusion 44 extends forward beyond the scraper body 1. The operator can simply place their hand over this protrusion to open the cover plate 4.

[0062] The use of the cleaning scraper in this embodiment is described as follows: When the blade 6 needs to be removed or installed, the cover plate 4 is opened. The blade 6 is inserted into or removed from the blade slot 12. After the removal or installation of the blade 6 is complete, the cover plate 4 is rotated into its closed position. The clamping projection 52 engages in the blade slot 12 to position and secure the cover plate 4, preventing it from being opened unintentionally.

[0063] The foregoing description merely presents the preferred embodiments of the present utility model and does not limit the present utility model in any way. Although the present utility model has been disclosed with reference to the preferred embodiments described above, this is not intended to limit the scope of the present utility model. Any person skilled in the art may, without deviating from the scope of the technical solutions of the present utility model, make minor modifications or changes to the disclosed technical content in order to create equivalent embodiments.Any simple modification, equivalent variation or change to the above-mentioned embodiments based on the technical essence of the present utility model shall, provided it does not deviate from the scope of the technical solutions of the present utility model, continue to fall within the scope of the technical solutions of the present utility model. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 211313262U

[0005]

Claims

[1] Blade-changing cleaning scrapers, characterized by that it includes the following: a scraper body (1) wherein a blade slot (12) for attaching a blade (6) is formed on the scraper body (1); a pair of end caps (2), wherein the end caps (2) are arranged at both ends of the scraper body (1), while at least one end cap (2) has a blade passage opening (21), wherein the lateral insertion opening of the blade slot (12) is oriented towards the blade passage opening (21); at least one cover plate (4) which is rotatably arranged within the blade passage opening (21), wherein the cover plate (4) has an open position and a closed position within the blade passage opening (21), wherein the lateral insertion opening of the blade slot (12) opens when the cover plate (4) is rotated into the open position, and the cover plate (4) closes the lateral insertion opening of the blade slot (12) when the cover plate (4) is rotated into the closed position. [2] Blade-changing cleaning scraper according to claim 1, characterized by , that a rotating structure of the cover plate (4) within the blade passage opening (21) comprises the following: a sliding chamber formed on the end cover (2), wherein an insertion opening is formed at the front end of the sliding chamber and the sliding chamber is connected to the blade passage opening (21) via the insertion opening, wherein the insertion opening is provided with a notch (33) in order not to impede the opening of the cover plate (4),wherein the cover plate (4) comprises a plug-in section (41) and a cover section (42), wherein the plug-in section (41) extends through the insertion opening into the sliding space and a pivot shaft (43) is provided on both sides of the inner end of the plug-in section (41), wherein the pivot shaft (43) is designed for vertical and rotary movement within the sliding space and enables the cover plate (4) to open and close when the pivot shaft (43) reaches the lower position of the sliding space, wherein the cover plate (4) is designed to drive the pivot shaft (43) and move it into the lower position of the sliding space when the cover plate (4) opens, while simultaneously the plug-in section (41) pivots into the notch (33), wherein the cover plate (4) is designed to drive the pivot shaft (43) and move it into the upper position of the sliding space when the Cover plate (4) folds down. [3] Blade-changing cleaning scraper according to claim 2, characterized by , that a locking projection (45) is provided on the cover section (42), while a locking recess (25) is formed on the side wall of the blade passage opening (21), wherein the locking projection (45) engages simultaneously in the locking recess (25) when the rotating shaft (43) moves into the upper position within the sliding space. [4] Blade-changing cleaning scraper according to claim 2, characterized by , that on the end cover (2) on the inside of the notch (33) an inclined surface (22) is formed, wherein the inclined surface (22) is designed such that it engages with the cover plate (4) in its open state and thereby increases the opening angle of the cover plate (4). [5] Blade-changing cleaning scraper according to claim 2, characterized by, that a sliding groove is formed on the surface of the mounting side of the end cap (2), wherein the sliding space is formed between the sliding material and the end face of the scraper body (1) when the end cap (2) is connected to the end face of the scraper body (1). [6] Blade-changing cleaning scraper according to claim 1, characterized by , that a rotating structure of the cover plate (4) within the blade passage opening (21) comprises the following: a pair of wave bores (26), wherein the two wave bores (26) are each formed at one of the two ends of the inside of the blade passage opening (21), wherein the cover plate (4) is provided with a pair of pivot pins (47), wherein the two pivot pins (47) are each inserted into the shaft bore (26), whereby the cover plate (4) is rotatably mounted within the blade passage opening (21); a clamping structure arranged between the cover plate (4) and the end cap (2), wherein a snap connection is created between the cover plate (4) and the end cap (2), which secures the cover plate (4) in the closed position when the cover plate (4) rotates into the closed position. [7] Blade-changing cleaning scraper according to claim 6, characterized by , that the blade passage opening (21) is a stepped groove, wherein the inner surface of the cover plate (4) forms a stepped surface that fits with the stepped groove, wherein an inner projection (46) is formed at the lower end of the inner surface of the cover plate (4), wherein the inner projection (46) is located in front of the lateral insertion opening of the blade slot (12) when the cover plate (4) is in the closed position. [8] Blade-changing cleaning scraper according to claim 6, characterized by , that the clamping structure comprises a clamping groove (51) and a clamping projection (52), wherein the clamping groove (51) is provided on the end cap (2) or the cover plate (4), wherein the clamping projection (52) is provided on the cover plate (4) or the end cap (2). [9] Blade-changing cleaning scraper according to claim 6, characterized by , that the pivot pin (47) and the cover plate (4) form an integral structure, wherein the pivot pin (47) is provided with a guide chamfer (48). [10] Blade-changing cleaning scraper according to claim 1, characterized by , that the lower end of the cover plate (4) is provided with a non-slip protrusion (44).

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