Damage detection device for powder spreading blades, powder spreading blades and additive manufacturing equipment

Abstract

The present application provides a damage detection device (20) for a powder spreading scraper (1), a powder spreading scraper (1), and an additive manufacturing device. The damage detection device (20) comprises: at least one conductive element (200), at least a portion of which is arranged inside a blade body (10) of the scraper (1) and connected between two poles of a power source (201) to form a closed loop with the power source (201); and at least one detection element (202), which is arranged in the closed loop and connected to the conductive element (200) and is used to detect the current on / off state of the conductive element (200) to determine damage to the blade body (10), so as to prevent printing losses caused by failure to promptly detect damage to the scraper (1).

Description

Technical Field

[0001] The present application relates to the field of additive manufacturing, and more specifically to a damage detection device for a powder spreading scraper, a powder spreading scraper and an additive manufacturing device. Background Art

[0002] In the process of metal additive manufacturing, powder spreading is one of the key steps. Its main task is to spread the metal powder evenly on the forming platform to prepare for the next step of laser or electron beam sintering / melting. The uniformity and thickness of the powder spreading directly affect the quality of the formed parts. Common powder spreading methods include roller powder spreading and scraper powder spreading. Among them, scraper powder spreading has been widely used because it can accurately control the thickness and uniformity of the powder layer. The scraper usually has a blade made of metal or flexible material.

[0003] However, in actual use, the blade of the scraper may be in contact with metal powder and the formed parts, especially when processing parts with warping or stress. These contacts may cause damage to the blade, such as notches or cracks. When the blade is damaged, the uniformity and thickness of the powder layer can no longer be guaranteed, thus affecting the final forming quality of the part.

[0004] At present, in the prior art, it is difficult to detect the damage of the scraper in time. Usually, it is necessary to check it manually or use external equipment after each printing cycle, which not only increases production costs and time, but also makes it difficult to avoid printing failures caused by scraper damage. Utility Model Content

[0005] The present application provides a damage detection device for a powder spreading scraper, a powder spreading scraper and an additive manufacturing device, which can effectively identify damage to the scraper and prevent printing losses caused by failure to promptly detect damage to the scraper.

[0006] In a first aspect, the present application provides a damage detection device for a powder spreading scraper, comprising: at least one conductive element, at least a portion of which is arranged inside the blade body of the scraper and connected between two poles of a power supply to form a closed loop with the power supply; and at least one detection element, which is arranged in the closed loop and connected to the conductive element, and is used to detect the current on-off state of the conductive element to determine the damage of the blade body.

[0007] In an optional solution of the first aspect, the conductive element is disposed in the blade body at a position close to the bottom of the blade body.

[0008] In an optional solution of the first aspect, the conductive element is disposed inside the blade body at a distance of 0.05-1 mm from the bottom of the blade body.

[0009] In an optional solution of the first aspect, the conductive element is arranged along the length direction of the blade body and is not less than the length of the blade body relative to the powder spreading area.

[0010] In an optional solution of the first aspect, the conductive elements are provided in plurality and are arranged at intervals in the height direction of the blade body; the number of the detection elements is the same as that of the conductive elements, and each detection element is connected in parallel with the conductive element.

[0011] In an optional solution of the first aspect, the detection element includes an alarm for issuing an alarm to indicate damage to the blade body.

[0012] In an optional solution of the first aspect, the conductive element is a conductive wire.

[0013] In a second aspect, the present application provides a powder spreading scraper, which includes a blade body and a damage detection device as described in any one of the first aspects.

[0014] In an optional solution of the second aspect, the blade body is configured as a flexible structure at least in a height portion from the conductive element to the bottom of the blade body.

[0015] In an optional solution of the second aspect, the blade body is composed of a main body and a base, the main body and the base are detachably connected, and the conductive element is arranged in the base.

[0016] In a third aspect, the present application provides an additive manufacturing device, which includes the powder spreading scraper described in any one of the second aspects.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate one or more embodiments of the present application and, together with the description, serve to explain the principles of the present application and to enable one of ordinary skill in the relevant art to make and use the present application.

[0019] Figure 1 is a schematic diagram of an exemplary scraper structure provided in an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of an exemplary scraper structure provided in an embodiment of the present application;

[0021] Figure 3 is an exemplary schematic diagram of blade damage provided in an embodiment of the present application;

[0022] Figure 4is a schematic diagram of a circuit principle of an exemplary damage detection device provided in an embodiment of the present application;

[0023] Figure 5 is a schematic diagram of an exemplary arrangement of a conductive element in a blade body provided in an embodiment of the present application;

[0024] Figure 6 is another exemplary circuit principle diagram of a damage detection device provided in an embodiment of the present application;

[0025] Figure 7 It is a schematic diagram of another exemplary arrangement of a conductive element in a blade body provided in an embodiment of the present application.

[0026] Description of main components: 1…scraper; 10…blade body; 101…main body; 102…base; 20…damage detection device; 200…conductive element; 200a…first conductive element; 200b…second conductive element; 200c…third conductive element; 210…conductive wire; 210a…first conductive wire; 210b…second conductive wire; 210c…third conductive wire; 201…power supply; 202…detection element; 212…buzzer; 212a…first buzzer; 212b…second buzzer; 212c…third buzzer; 30…building platform. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present application will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application.

[0028] Figure 1 FIG. 1 is an exemplary schematic diagram of a conventional scraper-type powder spreading method. Figure 1As shown, the scraper is mainly composed of a blade body 10 and a moving device (not shown) for driving the blade body 10 to move in the horizontal (X-axis) direction above the building platform 30. The blade body 10 is usually made of hard material or flexible material to ensure the flatness of the powder laying. During the powder laying process, the moving device moves the blade body 10 from one end of the building platform 30 to the other end. In this process, the blade body 10 can transport the powder material to the top of the building platform 30 and slide along the surface of the building platform 30 to evenly distribute the powder material on the entire building platform 30. When the blade body 10 moves to the other end of the building platform 30, the laying of a powder layer is completed. After each layer of powder is laid, the laser or electron beam of the printer will selectively melt or sinter on the laid powder layer to form a solid layer. After completing the printing of one layer, the building platform 30 will drop by a layer thickness, and the blade body 10 will lay powder again. This process will be repeated until the entire print is completed. In this way, the scraper powder spreading process can ensure the uniform laying of each layer of powder, thereby ensuring the forming quality of the printed parts during the additive manufacturing process.

[0029] However, in the actual printing process, due to frequent contact between the blade body 10 and the powder, or due to stress and warping problems during the metal printing process, part of the solid structure often passes through the powder layer and contacts the blade body 10. This contact will cause a gap to appear at the bottom of the blade body 10, resulting in the powder layer being unable to achieve a uniform and consistent thickness during the powder spreading process. If this damage cannot be discovered and handled in time, continuing to print will have a significant impact on the quality of subsequent printed parts.

[0030] The embodiment of the present application provides a scraper, the blade body 10 of the scraper can be made of a hard material (such as metal or cemented carbide), or a flexible material (such as rubber or plastic), or a combination of a hard material and a flexible material. The embodiment of the present application does not impose any special restrictions on the specific material of the blade body 10. For example, flexible blade bodies are widely used in the powder laying process of additive manufacturing. Flexible materials, such as rubber and plastic, have good elasticity and wear resistance, and can better adapt to the tiny bumps and irregularities of the building platform 30 during the powder laying process. However, flexible materials are prone to breakage after long-term use, affecting the uniform laying of the powder layer. If the damage of the flexible blade body cannot be detected in time, continued use will result in a decrease in the quality of the print.

[0031] Figure 2 is a schematic diagram of an exemplary scraper 1 structure provided in an embodiment of the present application, Figure 3 FIG. 1 is a schematic diagram of an exemplary damage to the blade 10 provided in an embodiment of the present application. Figure 2As shown, the scraper 1 has, in addition to the blade body 10, a conductive element 200 and a detection element 202 which together constitute a damage detection device, that is, the scraper includes the blade body 10 and the damage detection device.

[0032] The conductive element 200 is disposed inside the blade body 10, and one end of the conductive element 200 is electrically connected to the positive electrode of the power source 201, and the other end is electrically connected to the negative electrode of the power source 201, so that the conductive element 200 and the power source 201 form a closed loop. The detection element 202 is disposed in the closed loop and electrically connected to the conductive element 200, and is used to detect the current on / off state of the conductive element 200. When it is detected that the current of the conductive element 200 is in the on state, it means that the conductive element 200 is not damaged, and the blade body 10 can continue to perform normal powder spreading operation.

[0033] like Figure 3 As shown, when a notch appears at the bottom of the blade body 10 and the height of the notch exceeds the height of the conductive element 200 set on the blade body 10, the conductive element 200 will be physically disconnected. At this time, the detection element 202 can detect the current interruption of the conductive element 200. Due to the current interruption, the detection element 202 will feedback a signal that the blade body 10 is damaged, prompting the operator that the blade body 10 needs to be checked or replaced.

[0034] In some embodiments, the conductive element 200 is disposed along the length direction (Y axis) of the blade body 10, and its length is not less than the length of the blade body 10 relative to the powder spreading area. Specifically, the length of the powder spreading area refers to Figure 1 The length of the building platform 30 in the Y-axis direction is shown. In other words, the length of the conductive element 200 in the Y-axis direction can be equal to or greater than the length of the building platform 30 in the Y-axis direction. In this way, during the powder spreading operation, no matter where the blade 10 is located on the building platform 30, the conductive element 200 can cover the corresponding area. For example, if the length of the building platform 30 in the Y-axis direction is 500 mm, the length of the conductive element 200 can be set to ≥500 mm to ensure effective detection during the entire powder spreading process.

[0035] In some embodiments, the conductive element 200 may be arranged in a plurality along the width direction (X axis) of the blade body 10, i.e., across the width of the blade body 10. This arrangement enables the conductive element 200 to detect any damage in the width direction of the blade body 10. For example, the width of the conductive element 200 may be arranged to be at least equal to the width of the blade body 10, ensuring that the conductive element 200 can cover the entire width of the blade body 10 during the powder spreading process.

[0036] In some embodiments, the conductive element 200 may be a conductive wire, which is made of a metal material, such as a copper wire or a stainless steel wire, or other metal materials.

[0037] The inventor conducted comparative experiments on conductive wires of different materials, specifically pure copper wire and stainless steel wire. During the test, pure copper wire and stainless steel wire were energized respectively to detect the reaction of the conductive wire when a notch appeared in the blade body 10. The test results show that pure copper wire has certain advantages due to its excellent conductivity and toughness. When a notch appears in the blade body 10, the copper wire is not easy to break and can maintain the on-off state of the circuit, so that the detection element 202 can continuously monitor the condition of the blade body 10. This toughness helps to reduce false alarms, but in some cases, the copper wire may not be able to immediately feedback information when there is a slight damage. In contrast, the stainless steel wire showed a better feedback effect in the test. Although the toughness of the stainless steel wire is not as good as that of the copper wire, it is easier to break after a notch appears in the blade body 10, thereby quickly interrupting the circuit. This characteristic enables the stainless steel wire to immediately trigger the detection element 202 when a slight damage appears in the blade body 10, thereby providing more sensitive and accurate damage detection. It can be seen that the copper wire is suitable for application scenarios with high toughness requirements, can reduce false alarms, and is suitable for use when large damage needs to be detected in time. Stainless steel wire is suitable for application scenarios that require high sensitivity and precise detection. It can quickly provide feedback when minor damage occurs and is suitable for additive manufacturing processes with high precision requirements.

[0038] In some embodiments, the conductive element 200 may also be a conductive coating. The conductive coating is usually made of a material with good conductivity, such as a solid structure formed by silver paste, carbon nanotube coating or graphene coating. The specific material can be selected according to different application requirements. For example, the silver paste coating has excellent conductivity and stability, and is suitable for high-precision detection environments; the carbon nanotube coating and the graphene coating have good flexibility and durability, and are suitable for frequently used blades 10. The conductive coating can be evenly coated on the bottom or inside of the blade body 10. It should be understood that by covering the bottom of the blade body 10 with the conductive coating, it can be detected when there is slight damage on the bottom of the blade body 10, thereby improving the detection accuracy of damage to the blade body 10.

[0039] In some embodiments, the conductive element 200 is disposed inside the blade body 10 close to the bottom of the blade body 10. For example, the conductive element 200 may be disposed within a range of 0.05-1 mm from the bottom of the blade body 10. This arrangement position is determined based on statistical data of damage to the blade body 10 in actual operation, with the purpose of being able to detect damage to the blade body 10 in a timely manner.

[0040] According to the statistical data collected by the inventors during the actual equipment maintenance process, for example, the depth of the notch that appears on the flexible blade body (from bottom to top) is usually in the range of 0.1-0.3 mm. When the notch depth reaches or exceeds this range, the blade body 10 will no longer be usable, because at this time the blade body 10 can no longer guarantee the uniformity and thickness consistency of the powder. Therefore, for the flexible blade body, the pre-embedded depth of the conductive element 200 can be set between 0.05-0.2 mm, so that before the notch appears on the blade body 10 and the notch depth reaches the damage standard, the conductive element 200 will be destroyed, thereby timely detecting the damage of the blade body 10.

[0041] In addition to the embedded depth, the diameter of the conductive element 200 can also be set. In order to accurately detect damage when a notch appears on the blade body 10, the diameter of the conductive element 200 can be controlled within 0.05 mm. For example, a conductive wire with a diameter of less than 0.05 mm can be immediately disconnected when a tiny notch appears at the bottom of the blade body 10, so that the detection element 202 can detect the current interruption in time, so as to ensure that in the actual use of the blade body 10, once damage that affects the powder spreading effect occurs, an alarm or prompt can be issued in time to avoid subsequent problems caused by failure to detect damage in time.

[0042] In some embodiments, the power supply 201 can be used as a part of the damage detection device, that is, the damage detection device is composed of the conductive element 200, the power supply 201 and the detection element 202. Optionally, the power supply 201 may not be used as a part of the damage detection device, and the damage detection device is only composed of the conductive element 200 and the detection element 202, and the power supply 201 is an independent component. In a specific structure, a battery slot can be reserved in the damage detection device, and the user can select a suitable power type and install it by himself according to the needs.

[0043] In some embodiments, the detection element 202 can be configured in a variety of forms to achieve different detection and prompting functions. For example, the detection element 202 can be a warning device, such as a buzzer or an alarm light, which is used to sound an alarm when damage to the blade 10 is detected. The buzzer can sound an alarm when it detects that the conductive element 200 is disconnected, and promptly remind the operator that the blade 10 has been damaged and needs to be inspected and replaced. The alarm light can indicate the damage status of the blade 10 through visual signals, such as flashing or changing color, so as to ensure that the damage information can still be effectively prompted in a noisy working environment.

[0044] In addition, the detection element 202 can also be a current detector. The current detector can detect the current state of the conductive element 200, and determine whether the blade body 10 is damaged by monitoring the change in current. When the current is detected to be disconnected, the current detector can feed back the detection result to the industrial control system through the signal output interface. After receiving the feedback signal, the industrial control system can perform corresponding processing according to the preset logic, such as pausing the operation of the additive manufacturing equipment and triggering the alarm system. The current detector and the industrial control system can be connected by wire, and the detection signal is directly transmitted to the industrial control system through the cable. The industrial control system can be a central control system integrated in the additive manufacturing equipment, or it can be an independent external monitoring system, which displays the status of the blade body 10 in real time through the software interface, and records and analyzes the detection data.

[0045] In addition, the detection element 202 may also have a current detector and an alarm. For example, the current detector is used to detect the current state of the conductive element 200 in real time. When the conductive element 200 is intact, the current detector will detect a stable current flow; when the blade body 10 is damaged and the conductive element 200 is disconnected, the current detector will detect the current interruption. At the same time, the alarm is connected to the current detector. When the current detector detects that the conductive element 200 is disconnected, the alarm immediately triggers an alarm.

[0046] Figure 4 2 is a schematic diagram of the circuit principle of an exemplary damage detection device 20 provided in an embodiment of the present application. In this example, the detection element 202 is in the form of a buzzer 212, and the conductive element 200 is in the form of a conductive wire 210. Figure 4 As shown, the positive electrode of the power supply VCC provides the working voltage for the entire circuit. In this embodiment, the positive electrode of the power supply is connected to one end of the conductive wire 210 and the base B of the NPN transistor through a current limiting resistor R1. The function of the current limiting resistor R1 is to limit the current flowing into the base B to prevent the transistor from being damaged or the conductive wire 210 from overheating due to excessive current.

[0047] One end of the conductive wire 210 is connected to the connection point between the current limiting resistor R1 and the base B, and the other end of the conductive wire 210 is connected to the ground GND. Under normal circumstances, the conductive wire 210 is intact, and the current can flow through the conductive wire 210, so that the voltage of the base B remains low, and the NPN transistor is in a closed state. The base B is connected to the connection point between the current limiting resistor R1 and the conductive wire 210. When the conductive wire 210 is intact, the current flows into the base B through the current limiting resistor R1, so that the transistor remains in a closed state (that is, there is no path between the collector C and the emitter E). The collector C of the NPN transistor is connected to one end of the buzzer 212, and the emitter E is connected to the ground GND. The other end of the buzzer 212 is connected to the positive power supply VCC.

[0048] When the conductive wire 210 is intact, the NPN transistor is in the off state, the buzzer 212 circuit is interrupted, and the buzzer 212 does not sound, indicating that the blade 10 is not damaged. When a notch appears at the bottom of the blade 10, and the height of the notch exceeds the height set by the conductive wire 210, the conductive wire 210 is cut off. After the conductive wire 210 is disconnected, the current of the base B is cut off, and the voltage of the base B increases, causing the NPN transistor to turn on. Since the NPN transistor is turned on, a path is formed between the collector C and the emitter E, and the current passes through the buzzer 212 circuit, and the buzzer 212 sounds, indicating that the blade 10 is damaged.

[0049] In this way, when the conductive wire 210 is disconnected due to damage to the blade body 10, the buzzer 212 can start working, thereby notifying the user of the damage to the blade body 10, thereby avoiding the impact of damage to the blade body 10 on the printing quality. This design can provide timely feedback on the damage to the blade body 10, thereby avoiding the impact of damage to the blade body 10 on the printing quality, and allowing the user to perform maintenance and replacement in a timely manner.

[0050] Figure 5 2 is a schematic diagram of an exemplary arrangement of a conductive element 200 in a blade body 10 provided in an embodiment of the present application. The conductive element 200 is provided in plurality and is arranged at intervals in the height direction of the blade body 10. Figure 5 As shown, the conductive element 200 is configured to be composed of a first conductive element 200a, a second conductive element 200b and a third conductive element 200c arranged in sequence from bottom to top. The height of these conductive elements inside the blade body 10 can meet the range of 0.05-1 mm from the bottom of the blade body 10, preferably within 0.05-0.2 mm.

[0051] In practical applications, this multi-level arrangement of conductive elements 200 can improve the accuracy of damage detection. When a notch appears at the bottom of the blade body 10, as the depth of the notch increases, the conductive elements 200 will be cut off in sequence. For example, the first conductive element 200a is arranged at the position closest to the bottom of the blade body 10, and when the notch depth reaches a certain degree, it is cut off first; if the notch deepens further, the second conductive element 200b will be cut off; when it continues to deepen, the third conductive element 200c will also be cut off. Through this arrangement, the degree of damage to the blade body 10 can be monitored and judged more accurately. Each conductive element 200a, 200b, 200c is connected to a corresponding detection circuit. When a conductive element 200 is cut off, the corresponding detection circuit will detect the damage through current changes, and send out an alarm through the detection element 202 (such as a buzzer or an alarm light), reminding the user to check and maintain the blade body 10 in time. This multi-level arrangement of conductive elements 200 can also provide earlier damage warning, so that maintenance and replacement can be performed before the damage seriously affects the powder spreading effect, thereby avoiding affecting the printing quality.

[0052] In addition, the arrangement interval and number of the conductive elements can also be adjusted according to the specific size and application of the blade 10 to achieve the best detection effect. Through this multi-level and multi-point detection arrangement, the embodiment of the present application can significantly improve the accuracy of damage detection of the blade 10 and ensure the smooth progress of the additive manufacturing process.

[0053] Figure 6 2 is another exemplary circuit schematic diagram of a damage detection device 20 provided in an embodiment of the present application. In this example, the detection element 202 is in the form of a buzzer 212, and the conductive element 200 is in the form of a conductive wire 210. Figure 4 The main difference is that Figure 6 In the embodiment of the present invention, the number of the conductive wires 210 is 3, namely, the first conductive wire 210a, the second conductive wire 210b and the third conductive wire 210c. Correspondingly, the number of the buzzers 212 is also 3, namely, the first buzzer 212a, the second buzzer 212b and the third buzzer 212c. Each conductive wire and buzzer constitutes an independent parallel circuit group, namely, the first parallel group, the second parallel group and the third parallel group, and each parallel group is provided with an NPN transistor.

[0054] Specifically, the positive electrode VCC of the power supply is connected to the conductive wire ends of each parallel group through the current limiting resistor R1. The first parallel group includes the first conductive wire 210a and the first buzzer 212a, the second parallel group includes the second conductive wire 210b and the second buzzer 212b, and the third parallel group includes the third conductive wire 210c and the third buzzer 212c. The base B of the NPN transistor in each parallel group is connected to the corresponding conductive wire, the collector C is connected to one end of the corresponding buzzer, and the emitter E is connected to the ground GND.

[0055] Under normal circumstances, each conductive wire 210a, 210b, 210c is in good condition, and current can flow through the conductive wire, so that the voltage of the base B is low, and the NPN transistor is in a closed state. Since the transistor is closed, there is no path between the collector C and the emitter E, and the buzzer 212a, 212b, 212c circuit is interrupted and no sound is emitted, indicating that the blade 10 is not damaged.

[0056] When a notch appears at the bottom of the blade 10, and the height of the notch exceeds the set height of a certain conductive wire, the conductive wire is cut off. For example, when the first conductive wire 210a is cut off, the current cannot flow through the first conductive wire 210a, the base B current is cut off, and the base B voltage increases, causing the NPN transistor in the first parallel group to be turned on. Since the transistor is turned on, a path is formed between the collector C and the emitter E, and the current passes through the first buzzer 212a loop, and the first buzzer 212a sounds, prompting that the blade 10 is damaged within the height range of the first conductive wire 210a. Similarly, if the notch is further deepened, causing the second conductive wire 210b and the third conductive wire 210c to be cut off in turn, the NPN transistors of the second parallel group and the third parallel group will also be turned on in turn, triggering the second buzzer 212b and the third buzzer 212c to sound respectively. Through this multi-level detection arrangement, the degree of damage to the blade 10 can be more accurately monitored and judged. The design of the NPN transistors and buzzers in each parallel group ensures that even if a layer of conductive wires is cut and the corresponding buzzer alarm is triggered, other undamaged conductive wires and their corresponding buzzers remain in normal working condition, thereby providing a more reliable damage warning system. Optionally, buzzers or warning lights at different levels can emit different prompt sounds or light colors, so that the operator can quickly and accurately determine the specific damage location and severity of the blade 10.

[0057] As described above, the blade body 10 provided by the present application can also be a structure formed by combining a hard material and a flexible material. In this case, the blade body 10 is configured as a flexible structure at least in the height portion from the conductive element 200 to the bottom of the blade body 10. The configuration of the flexible structure can effectively absorb and buffer external stress and friction, thereby reducing the risk of wear and damage to the blade body 10 during use. Of course, the blade body 10 can also be configured as a flexible structure or a hard structure in its entirety according to specific application requirements.

[0058] Figure 7 : is another exemplary arrangement schematic diagram of the conductive element 200 in the blade body 10 provided in an embodiment of the present application. In some embodiments, in order to facilitate the replacement of the damaged blade body 10, the blade body 10 is constructed to consist of a main body 101 and a base 102, and the main body 101 and the base 102 are detachably connected. This design can effectively improve the maintenance and replacement efficiency of the blade body 10. When the base 102 of the blade body 10 is damaged, only the base 102 needs to be replaced without replacing the entire blade body 10, thereby saving cost and time. The conductive element 200 is arranged in the base 102 to better monitor the damage of the blade body 10. The base 102 can adopt a flexible structure so that it can better adapt to the surface morphology of the building platform 30 and reduce damage and wear during the powder spreading process.

[0059] Specifically, the arrangement of the conductive element 200 inside the base 102 can be optimized as needed. The conductive element 200 can be arranged along the length direction and the height direction of the blade body 10 to ensure that effective damage monitoring can be achieved at each key part of the blade body 10. By pre-embedding the conductive element 200 in the base 102, when the blade body 10 is damaged during use, resulting in the disconnection of the conductive element 200, the damage detection device can detect the disconnection of the circuit in time, and send an alarm signal through the detection element 202 to remind the operator to replace the base 102 in time.

[0060] It should be understood that, except for the conductive element 200, the embodiments of the present application do not restrict the specific location of other circuit elements involved in the damage detection device, and can be flexibly arranged according to actual design requirements. For example, the circuit elements can all be arranged inside the blade body 10, or they can be distributed in other positions. The specific configuration depends on the overall design and functional requirements of the equipment. In addition, the embodiments of the present application do not restrict the specific structure of the moving device of the scraper 1. In actual applications, the structure of the moving device can be varied, for example, a variety of mobile drive methods such as linear guides, ball screws, belt drives, etc. can be used to meet the needs of different additive manufacturing equipment.

[0061] In some embodiments, the present application also provides an additive manufacturing device, which is not limited to a specific type. As long as it can be applied to the additive manufacturing device provided in the embodiment of the present application for spreading powder with the scraper, it is within the scope of protection of the present application. Additive manufacturing equipment may include but is not limited to various technical types such as laser sintering, laser melting, and electron beam melting. In these devices, the process of using the scraper 1 to spread powder ensures the uniform distribution of the powder material and provides a stable foundation for subsequent forming processing.

[0062] In addition, the additive manufacturing equipment of the present application may also include a monitoring system to achieve real-time monitoring and control of the powder spreading process. By integrating the damage detection device provided by the present application, the additive manufacturing equipment can promptly issue an alarm when the blade 10 is damaged, reminding the operator to perform maintenance or replacement, thereby ensuring the continuity of the printing process and the quality of the finished product.

[0063] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A damage detection device (20) for a powder spreading scraper (1), characterized in that: include: At least one conductive element (200), at least a portion of which is disposed inside the blade body (10) of the scraper (1) and connected between two poles of a power source (201) to form a closed loop with the power source (201); as well as At least one detection element (202) is arranged in the closed loop and connected to the conductive element (200), and is used to detect the current on / off state of the conductive element (200) to determine damage to the blade body (10).

2. The damage detection device (20) according to claim 1, characterized in that: The conductive element (200) is disposed in a position inside the blade body (10) close to the bottom of the blade body (10).

3. The damage detection device (20) according to claim 2, characterized in that: The conductive element (200) is disposed at a position inside the blade body (10) 0.05-1 mm away from the bottom of the blade body (10).

4. The damage detection device (20) according to claim 1, characterized in that: The conductive element (200) is arranged along the length direction of the blade body (10) and is not less than the length of the blade body (10) relative to the powder spreading area.

5. The damage detection device (20) according to claim 1, characterized in that: The conductive elements (200) are provided in plurality and are arranged at intervals in the height direction of the blade body (10); the number of the detection elements (202) is the same as that of the conductive elements (200), and each detection element (202) is connected in parallel with the conductive element (200).

6. The damage detection device (20) according to claim 1, characterized in that: The detection element (202) comprises an alarm device for issuing an alarm to indicate damage to the blade body (10).

7. The damage detection device (20) according to any one of claims 1 to 6, characterized in that: The conductive element (200) is a conductive wire (210).

8. A powder spreading scraper (1), characterized in that: It comprises a blade body (10) and a damage detection device (20) as claimed in any one of claims 1 to 7.

9. The powder spreading scraper (1) according to claim 8, characterized in that: The blade body (10) is configured as a flexible structure at least in the height portion from the conductive element (200) to the bottom of the blade body (10).

10. The powder spreading scraper (1) according to claim 8, characterized in that: The blade body (10) is composed of a main body (101) and a base (102); the main body (101) and the base (102) are detachably connected; and the conductive element (200) is arranged in the base (102).

11. An additive manufacturing device, characterized in that: It comprises the powder spreading scraper (1) as described in any one of claims 8 to 10.

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