A scraper quick-release installation structure and a quantitative powder feeding device for a 3D printer

Abstract

The utility model relates to the technical field of powder feeding of 3D printers, and in particular discloses a scraper quick-release installation structure and a quantitative powder feeding device of a 3D printer, comprising: a scraper moving frame; a scraping component, comprising a knife frame assembly arranged at the bottom of the scraper moving frame and a scraper slidably arranged inside the knife frame assembly, wherein one end of the interior of the knife frame assembly is provided with a press-type clamping assembly elastically clamped with the scraper; the utility model adopts an elastic clamping method, so that the scraper and the knife frame are locked by one press and then released by one press, which changes the traditional multi-group bolt fixing installation method, has the advantages of convenient disassembly and assembly, and is convenient for maintenance and replacement of the scraper; the locking assembly can assist in the fixing effect, and increase the stability of the scraper when in use; the quantitative assembly can perform quantitative weighing according to the required amount of metal powder, ensure the accuracy of powder supply, and reduce the problem of difficulty in recycling caused by excessive powder.

Description

Technical Field

[0001] The utility model relates to the technical field of powder feeding of a 3D printer, and in particular discloses a scraper quick-disassembly installation structure and a quantitative powder feeding device of a 3D printer. Background Art

[0002] 3D metal printer is a scientific instrument used in the fields of physics, engineering and technology science, and mechanical engineering. It uses laser melting technology to melt metal powder to form functional solid parts. It is a fully digital rapid prototyping manufacturing process. It directly produces full high-density metal parts based on the interface data of three-dimensional CAD layering. The thickness of the melted metal layer ranges from 20 microns to 100 microns. When manufacturing parts, the metal rapid prototyping 3D printer first uses a scraper to evenly distribute the metal layer, and then melts each metal layer separately in a strictly controlled air environment.

[0003] Whether the powder is spread evenly is an important factor affecting the printing accuracy. The uniformity of powder spreading is related to the powder feeding amount and the scraper. If the powder feeding amount is too little, it will not be spread evenly on the surface of the forming plate, and if the powder feeding is too much, it will increase the difficulty of recycling. Traditional 3D metal printers use the lifting powder bin, and then the scraper pushes the metal powder in the rising powder bin to the forming plate. This method cannot ensure accurate powder feeding and is prone to over-feeding.

[0004] The bottom of the scraper will scrape the upper surface of the printed material when in use, and it is very easy to wear. After wear, notches will appear on the bottom of the scraper, making it impossible to scrape the powder evenly. Therefore, it needs to be disassembled and replaced frequently. Traditional scrapers are usually fixed with multiple bolts, which is very inconvenient to disassemble. At the same time, too many times of screw removal can easily lead to problems such as screw thread slippage and loose installation. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In view of the problem that the existing scraper is difficult to disassemble and assemble, a scraper quick-disassembly installation structure is proposed.

[0007] Therefore, one of the objects of the present invention is to provide a scraper quick-release installation structure.

[0008] In order to solve the above technical problems, the utility model provides the following technical solutions: a scraper quick-release installation structure, comprising:

[0009] Scraper moving rack;

[0010] The scraper component comprises a knife frame assembly arranged at the bottom of the scraper moving frame and a scraper slidably arranged inside the knife frame assembly, wherein one end of the knife frame assembly is provided with a press-type clamping assembly elastically clamped with the scraper;

[0011] The tool holder assembly includes a fixing plate, a slot is provided at the bottom of the fixing plate, and a cavity for accommodating a press-type clamping assembly is provided at one end of the fixing plate.

[0012] As a preferred solution of the scraper quick-release installation structure described in the utility model, the push-type clamping assembly includes a bracket symmetrically installed in the cavity and a guide locking rod symmetrically fixed to one end of the scraper, a cylindrical block is provided on one side of the bracket, a connecting column rotatably connected to the bracket is fixed at one end of the cylindrical block, a torsion spring is sleeved on the outside of the connecting column, and two end angles of the torsion spring are respectively fixed to the bracket and the cylindrical block.

[0013] As a preferred solution of the scraper quick-release installation structure of the utility model, a slot is provided on the outside of the cylindrical block, and a guide column extending into the slot is fixed to one end of the guide locking rod.

[0014] As a preferred solution of the scraper quick-release installation structure of the utility model, the slot includes a triangular guide slot, a triangular guide block is fixed on the outside of the right angle of the triangular guide slot, and a U-shaped slot is opened on the inside of the right angle of the triangular guide slot.

[0015] As a preferred solution of the scraper quick-release installation structure of the utility model, the scraper component also includes a locking assembly, and the locking assembly is arranged on the outer side of one end of the tool holder assembly for locking the scraper.

[0016] As a preferred solution of the scraper quick-release installation structure described in the utility model, the locking assembly includes a hollow column fixed to the outside of one end of the tool holder assembly, an insertion rod is arranged through the axis of the hollow column, a pressure plate is fixed on the outside of the insertion rod in the hollow column, and a spring is arranged on the outside of the insertion rod in the hollow column, a 7-shaped groove is opened on the outside of the insertion rod in the hollow column, and a limiting column extending into the 7-shaped groove is fixed to the inside of the hollow column.

[0017] The beneficial effects of the utility model are as follows: the utility model adopts an elastic clamping method, so that the scraper and the blade holder can be locked with one press and released with another press, which changes the traditional multi-group bolt fixing installation method. It has the advantage of easy disassembly and assembly, facilitates the maintenance and replacement of the scraper, reduces the difficulty of disassembly and assembly, reduces the time of disassembly and assembly, and solves the problem that the bolt fixing is prone to slipping due to the number of disassembly and assembly times.

[0018] The locking assembly can assist in fixing the scraper, thereby increasing the stability of the scraper when in use.

[0019] In view of the problem that excessive feeding of materials in the existing 3D printer increases the difficulty of recycling, a quantitative powder feeding device for a 3D printer is proposed.

[0020] Therefore, the utility model also provides a quantitative powder feeding device for a 3D printer.

[0021] In order to solve the above technical problems, the utility model also provides the following technical solutions: including the above scraper quick-release installation structure, and also including a feeding component;

[0022] The feeding component comprises a support, a quantitative component is installed above the support, and an equalizer connected with a material outlet of the quantitative component is arranged at the bottom of the support.

[0023] As a preferred solution of the quantitative powder feeding device of the 3D printer of the utility model, wherein: the quantitative component includes a collecting barrel and support frames symmetrically arranged on both sides of the collecting barrel.

[0024] As a preferred solution of the quantitative powder feeding device of the 3D printer of the utility model, a weighing scale is installed on the inner side of the two support frames, a connecting rod is fixed on the outer side of the collecting barrel, and the bottom end of the connecting rod passes through the support frame and is fixed on the weighing side of the weighing scale.

[0025] As a preferred solution of the quantitative powder feeding device of the 3D printer of the utility model, wherein: the bottom of the collecting barrel is connected to a discharge pipe, the discharge end of the discharge pipe is connected to the feed end of the equalizer, and a butterfly valve is installed on the discharge pipe.

[0026] The beneficial effects of the utility model are as follows: the quantitative component can carry out quantitative weighing according to the required amount of metal powder, ensuring the accuracy of powder supply and reducing the problem of difficulty in recycling caused by excessive powder. At the same time, the weighed powder is transported in a straight line to the front side of the scraper through the equalizer, which is convenient for the scraper to spread evenly and improves the uniformity of the powder spreading. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0028] Figure 1 It is a schematic diagram of the overall structure of the scraper quick-disassembly installation structure and the quantitative powder feeding device of the 3D printer of the utility model.

[0029] Figure 2 It is a structural schematic diagram of the scraper quick-release installation structure of the utility model.

[0030] Figure 3 It is a structural schematic diagram of the blade holder assembly in the scraper quick-release installation structure of the utility model.

[0031] Figure 4 It is a structural schematic diagram of the press-type clamping assembly in the scraper quick-release installation structure of the utility model.

[0032] Figure 5 It is a structural schematic diagram of the card slot in the scraper quick-release installation structure of the utility model.

[0033] Figure 6 It is a structural schematic diagram of the locking assembly in the scraper quick-release installation structure of the utility model.

[0034] Figure 7 It is a structural schematic diagram of a quantitative powder feeding device of a 3D printer of the utility model.

[0035] Figure 8 The utility model is a schematic diagram of the structure of the quantitative component in the quantitative powder feeding device of the 3D printer. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0040] Example 1

[0041] Reference Figure 1, provides a schematic diagram of the overall structure of a scraper quick-release installation structure and a quantitative powder feeding device of a 3D printer, such as Figure 1-5 , a scraper quick-release installation structure, comprising:

[0042] The scraper moving frame 100 is installed inside the printing area of ​​the 3D printer and is horizontally displaced above the molding plate;

[0043] The scraper component 200 includes a blade holder assembly 201 disposed at the bottom of the scraper moving frame 100 and a scraper 202 slidably disposed inside the blade holder assembly 201. A press-type clamping assembly 203 elastically clamped with the scraper 202 is disposed at one end of the blade holder assembly 201.

[0044] The tool holder assembly 201 includes a fixing plate 201a, which is fixed to the bottom of the scraper moving frame 100 by bolts. A slot 201b is provided at the bottom of the fixing plate 201a, and a cavity 201c for accommodating the press-type clamping assembly 203 is provided at one end of the fixing plate 201a.

[0045] Specifically, one end of the slot 201b is connected to the cavity 201c, and slideways are provided on both sides of the slot 201b. Slide blocks sliding in the slideways are fixed on both sides of the scraper 202. When inserted, the slide blocks on both sides of the scraper 202 correspond to the slideways, and a gentle push can make the scraper 202 slide in the slot 201b.

[0046] Specifically, the length of the slot 201 b is longer than the length of the scraper 202 , so that the scraper 202 has room to move when pressed.

[0047] Furthermore, the press-type clamping assembly 203 includes a bracket 203a symmetrically installed in the cavity 201c and a guide lock rod 203b symmetrically fixed to one end of the scraper 202, a cylindrical block 203c is provided on one side of the bracket 203a, a connecting column 203d rotatably connected to the bracket 203a is fixed on one end of the cylindrical block 203c, and a torsion spring 203e is sleeved on the outside of the connecting column 203d;

[0048] Specifically, the two end corners of the torsion spring 203e are respectively fixed on the bracket 203a and the cylindrical block 203c. When the cylindrical block 203c is rotated by an external force, the angle between the two end corners of the torsion spring 203e changes. After the external force disappears, the torsion spring 203e will drive the cylindrical block 203c to reset.

[0049] Furthermore, a slot 203f is formed on the outside of the cylindrical block 203c, and a guide column extending into the slot 203f is fixed to one end of the guide locking rod 203b.

[0050] Specifically, one end of the guide locking rod 203b is provided with a pipe thread, and the end of the scraper 202 is fixedly connected with a nut. During installation, the installation of the guide locking rod 203b is completed by the thread matching of the pipe thread and the thread.

[0051] Furthermore, the slot 203f includes a triangular guide slot 203f-1, a triangular guide block 203f-2 is fixed on the outer side of the right angle of the triangular guide slot 203f-1, and a U-shaped slot 203f-3 is opened on the inner side of the right angle of the triangular guide slot 203f-1.

[0052] Specifically, the two ends of the triangular guide groove 203f-1 are respectively opened as an inlet and an outlet. When the torsion spring 203e is not subjected to force, the inlet coincides with the guide column at the end of the guide lock rod 203b. When the scraper 202 moves along the slot 201b, the guide column at its end will be inserted from the inlet of the triangular guide groove 203f-1. Since the triangular guide groove 203f-1 is a triangular structure, as the guide column is inserted, the triangular guide groove 203f-1 is subjected to force to drive the cylindrical block 203c to rotate so as to facilitate the continued insertion of the guide column. The triangular guide groove 203f-1 is The connection between the inlet 1 and the triangular guide block 203f-2 is an inclined surface structure. When the guide column is inserted into this section, it will slide along the inclined surface structure and will be loosened when it slides to the triangular guide block 203f-2. At this time, the triangular guide groove 203f-1 loses external force and drives the cylindrical block 203c to reset under the reaction force of the torsion spring 203e. Therefore, the cylindrical block 203c reverses. Under the reverse action, the inclined surface of the triangular guide block 203f-2 will drive the guide column to slide downward along the inclined surface until it falls into the U-shaped slot 203f-3, completing the installation of the scraper 202.

[0053] Operation process: When installing the scraper 202, the sliders on both sides of the scraper 202 correspond to the slides, and the scraper 202 can be pushed gently to slide in the slot 201b. When the scraper 202 moves along the slot 201b, the guide column at its end will be inserted from the entrance of the triangular guide groove 203f-1. Since the triangular guide groove 203f-1 is a triangular structure, as the guide column is inserted, the force of the triangular guide groove 203f-1 will drive the cylindrical block 203c to rotate to facilitate the continued insertion of the guide column. The entrance of the triangular guide groove 203f-1 is aligned with the triangular guide groove 203f-1. The connection between the angle guide blocks 203f-2 is a slope structure. When the guide column is inserted into this section, it will slide along the slope structure and will be loosened when it slides to the triangular guide block 203f-2. At this time, the triangular guide groove 203f-1 loses external force and drives the cylindrical block 203c to reset under the reaction force of the torsion spring 203e. Therefore, the cylindrical block 203c reverses. Under the reverse action, the slope of the triangular guide block 203f-2 drives the guide column to slide downward along the slope until it falls into the U-shaped slot 203f-3, completing the installation of the scraper 202.

[0054] During disassembly, the scraper 202 is pressed again. After being pressed, the scraper 202 drives the guide column to slide from the other inclined surface of the triangular guide block 203f-2 into the outlet of the triangular guide groove 203f-1. At this time, it is released, and the torsion spring 203e automatically resets and drives the cylindrical block 203c to rotate. Therefore, the triangular guide groove 203f-1 rotates synchronously to give a thrust to the scraper 202, so that the guide column is separated from the triangular guide groove 203f-1, and the disassembly is completed.

[0055] This structure adopts an elastic clamping method, so that the scraper 202 and the tool holder assembly 201 can be locked with one press and released with another press, which changes the traditional multi-group bolt fixing installation method. It has the advantage of easy disassembly and assembly, facilitates the maintenance and replacement of the scraper 202, reduces the difficulty of disassembly and assembly, reduces the time of disassembly and assembly, and solves the problem that bolt fixing is prone to slipping due to the number of disassembly and assembly times.

[0056] Example 2

[0057] Reference Figure 6 This embodiment is different from the first embodiment in that the scraper component 200 of this embodiment further includes a locking assembly 204 , which is disposed on the outer side of one end of the tool holder assembly 201 and is used to lock the scraper 202 .

[0058] Furthermore, the locking assembly 204 includes a hollow column 204a fixed to the outside of one end of the tool holder assembly 201, an insertion rod 204b is set through the axis of the hollow column 204a, a pressure plate 204c is fixed to the outside of the insertion rod 204b in the hollow column 204a, and a spring 204d is set to the outside of the insertion rod 204b in the hollow column 204a, a 7-shaped groove 204e is opened on the outside of the insertion rod 204b in the hollow column 204a, and a limiting column 204f extending into the 7-shaped groove 204e is fixed to the inner side of the hollow column 204a.

[0059] Specifically, both ends of the insertion rod 204b are located outside the hollow column 204a, the longer end is the locking end, and the other end is the extraction end. The extraction end is equipped with a ball handle for easy gripping and extraction. A locking hole is provided on one side of the fixing plate 201a and the scraper 202. The inner diameter of the locking hole is consistent with the diameter of the insertion rod 204b, so that the insertion rod 204b can be inserted into the locking hole to complete the locking.

[0060] The rest of the structure is the same as that of Example 1.

[0061] Operation process: When locking, hold the ball handle with your hand and pull the insertion rod 204b outward. After the insertion rod 204b is pulled, the pressure plate 204c compresses the spring 204d, and at the same time, the 7-shaped groove 204e slides along the limiting column 204f. When sliding to a right angle, rotate the insertion rod 204b so that the short groove of the 7-shaped groove 204e slides along the limiting column 204f. At this time, the locking end of the insertion rod 204b is retracted into the locking hole of the fixed plate 201a, and the scraper 202 is inserted into the slot 201b for installation. After installation, its locking hole will correspond to the locking hole on the fixed plate 201a. At this time, rotate the insertion rod 204b so that the limiting column 204f slides into the long groove section of the 7-shaped groove 204e, and further drives the insertion rod 204b to be inserted into the locking hole of the scraper 202 under the reaction force of the spring 204d to complete the locking. This structure can assist in the fixing effect and increase the stability of the scraper 202 when in use.

[0062] Example 3

[0063] Reference Figure 7-8 , this embodiment is different from the above embodiment in that: this embodiment discloses a quantitative powder feeding device for a 3D printer, including the above scraper quick-release installation structure, and also includes a feeding component 300;

[0064] The feeding component 300 includes a support 301 , a quantitative component 302 is installed above the support 301 , and a divider 303 connected to the discharge port of the quantitative component 302 is arranged at the bottom of the support 301 .

[0065] Specifically, the divider 303 is a trapezoidal structure, and the upper end of the trapezoid is equidistantly penetrated with oblique discharge ports, so that when the metal powder is conveyed, the powder can be evenly arranged in a long "I" shape.

[0066] Furthermore, the quantitative assembly 302 includes a collecting barrel 302a and support frames 302b symmetrically arranged on both sides of the collecting barrel 302a.

[0067] Furthermore, a weighing scale 302c is installed on the inner side of the two support frames 302b, and a connecting rod 302d is fixed on the outer side of the collecting barrel 302a. The bottom end of the connecting rod 302d passes through the support frame 302b and is fixed to the weighing side of the weighing scale 302c.

[0068] Furthermore, the bottom of the collecting barrel 302a is connected to a discharge pipe 302e, the discharge end of the discharge pipe 302e is connected to the feed end of the equalizer 303, and a butterfly valve 302f is installed on the discharge pipe 302e.

[0069] Specifically, the weighing scale 302c and the butterfly valve 302f are both controlled by the controller. The metal powder in the collecting barrel 302a will be weighed by the weighing scale 302c, and the weighed weight will be transmitted to the controller. The controller sets a single delivery threshold. Each time the butterfly valve 302f is opened, the weight in the collecting barrel 302a will be monitored in real time. When the lost weight reaches the threshold, the butterfly valve 302f will be closed, thereby playing the function of quantitative delivery. Quantitative weighing can be performed according to the required amount of metal powder to ensure the accuracy of powder supply and reduce the problem of difficulty in recycling due to excessive powder. At the same time, the weighed powder is conveyed in a straight line to the front side of the scraper 202 through the equalizer 303, which is convenient for the even spreading of the scraper 202 and improves the uniformity of the powder spreading.

[0070] The rest of the structure is the same as that of Example 2.

[0071] Operation process: The controller sets a single conveying threshold. Each time the butterfly valve 302f is opened, the weight in the collecting barrel 302a is monitored in real time. When the lost weight reaches the threshold, the butterfly valve 302f is closed, and the conveyed metal powder is conveyed to the forming plate through the equalizer 303. The equalizer 303 is a trapezoidal structure, and the upper end of the trapezoid is equidistantly penetrated with oblique discharge ports, so that when conveying the metal powder, the powder can be evenly arranged in a long "I" shape.

[0072] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0073] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0074] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A scraper quick-release installation structure, characterized in that: include: Scraper moving frame (100); The scraper component (200) comprises a blade holder assembly (201) arranged at the bottom of the scraper moving frame (100) and a scraper (202) slidably arranged inside the blade holder assembly (201); a press-type clamping assembly (203) elastically clamped with the scraper (202) is arranged at one end inside the blade holder assembly (201); The tool holder assembly (201) comprises a fixing plate (201a), a slot (201b) is provided at the bottom of the fixing plate (201a), and a cavity (201c) for accommodating a press-type clamping assembly (203) is provided at one end of the fixing plate (201a).

2. The scraper quick-release installation structure according to claim 1, characterized in that: The push-type clamping assembly (203) comprises a bracket (203a) symmetrically installed in the cavity (201c) and a guide locking rod (203b) symmetrically fixed to one end of the scraper (202), a cylindrical block (203c) is arranged on one side of the bracket (203a), a connecting column (203d) rotatably connected to the bracket (203a) is fixed at one end of the cylindrical block (203c), and a torsion spring (203e) is sleeved on the outside of the connecting column (203d).

3. The scraper quick-release installation structure according to claim 2, characterized in that: A slot (203f) is provided on the outside of the cylindrical block (203c), and a guide column extending into the slot (203f) is fixed to one end of the guide locking rod (203b).

4. The scraper quick-release installation structure according to claim 3, characterized in that: The clamping groove (203f) comprises a triangular guide groove (203f-1), a triangular guide block (203f-2) is fixed on the outside of the right angle of the triangular guide groove (203f-1), and a U-shaped clamping groove (203f-3) is provided on the inside of the right angle of the triangular guide groove (203f-1).

5. The scraper quick-release installation structure according to claim 4, characterized in that: The scraper component (200) further comprises a locking assembly (204), wherein the locking assembly (204) is arranged on the outer side of one end of the blade holder assembly (201) and is used to lock the scraper (202).

6. The scraper quick-release installation structure according to claim 5, characterized in that: The locking assembly (204) comprises a hollow column (204a) fixed to the outside of one end of the tool holder assembly (201), an insertion rod (204b) is arranged through the axis of the hollow column (204a), a pressing plate (204c) is fixed to the outside of the insertion rod (204b) in the hollow column (204a), and a spring (204d) is fixed to the outside of the insertion rod (204b) in the hollow column (204a), a 7-shaped groove (204e) is provided on the outside of the insertion rod (204b) in the hollow column (204a), and a limiting column (204f) extending into the 7-shaped groove (204e) is fixed to the inside of the hollow column (204a).

7. A quantitative powder feeding device for a 3D printer, characterized in that: It comprises the scraper quick-release installation structure as claimed in any one of claims 1 to 6, and also comprises a feeding component (300); The feeding component (300) comprises a support (301), a quantitative component (302) is installed above the support (301), and a divider (303) connected to the discharge port of the quantitative component (302) is arranged at the bottom of the support (301).

8. The quantitative powder feeding device of the 3D printer according to claim 7, characterized in that: The quantitative assembly (302) comprises a material collecting barrel (302a) and support frames (302b) symmetrically arranged on both sides of the material collecting barrel (302a).

9. The quantitative powder feeding device of the 3D printer according to claim 8, characterized in that: A weighing scale (302c) is installed on the inner side of the two support frames (302b), and a connecting rod (302d) is fixed on the outer side of the collecting barrel (302a). The bottom end of the connecting rod (302d) passes through the support frame (302b) and is fixed to the weighing side of the weighing scale (302c).

10. The quantitative powder feeding device of the 3D printer according to claim 9, characterized in that: The bottom of the collecting barrel (302a) is connected to a discharge pipe (302e), the discharge end of the discharge pipe (302e) is connected to the feed end of the equalizer (303), and a butterfly valve (302f) is installed on the discharge pipe (302e).

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