Collision mechanism suitable for 3D printer and 3D printer

Abstract

A collision mechanism suitable for a 3D printer and the 3D printer, the collision mechanism is installed on the shell of the 3D printer, the collision mechanism comprises a touch piece and a reset piece, the touch piece and the reset piece are connected with the shell, one end of the touch piece is hinged with the shell, so that the touch piece can rotate relative to the shell, the axis of the hinge between the touch piece and the shell is parallel to the first direction, the collision mechanism collides with the trigger piece of the lifting mechanism moving along the first direction, which can realize the passive lifting of the first hot end assembly in the 3D printing head, when the collision mechanism collides with the trigger piece of the lifting mechanism moving along a direction different from the first direction, the touch piece can rotate relative to the shell, which reduces the collision force suffered by the 3D printing head and plays a buffering role to protect the 3D printing head, the reset piece can reset the touch piece after rotating relative to the shell.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and more particularly to a collision mechanism suitable for a 3D printer and a 3D printer. Background Technology

[0002] 3D printers use 3D printheads to print three-dimensional products. These products may contain different colors or materials, requiring the 3D printer to provide various filaments during the printing process.

[0003] In current 3D printers, a drive mechanism is integrated into the 3D print head. The drive mechanism actively drives the switching of the feed line. However, integrating a drive mechanism into the 3D print head makes the 3D print head too bulky. Utility Model Content

[0004] This application provides a collision mechanism and a 3D printer suitable for 3D printers, which enables the 3D print head to passively raise and lower the first hot end component, thereby allowing the first hot end component and the second hot end component to switch during material ejection.

[0005] In a first aspect, this application provides a collision mechanism suitable for a 3D printer. The 3D printer includes a 3D print head and a housing. The 3D print head can move relative to the housing along at least one of a first direction and a second direction, wherein the first direction and the second direction are perpendicular to each other. The 3D print head includes a first hot end assembly, a second hot end assembly, and a connecting frame. The first hot end assembly is connected to the connecting frame via a lifting mechanism, and the second hot end assembly is connected to the connecting frame. The lifting mechanism includes a trigger element. The collision mechanism is mounted on the housing and includes a contact element and a reset element. One end of the contact element is hinged to the housing, and the axis of hinge between the contact element and the housing is parallel to the first direction. The other end of the contact element is used to collide with the trigger element in the 3D print head moving along the first direction to drive the first hot end assembly to move up and down. The contact element and the reset element are connected to the housing, and the reset element includes an elastic element or a magnetic suction element.

[0006] In conjunction with the first aspect, in one possible implementation, the reset member is connected between the contact member and the housing along a second direction or a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0007] In conjunction with the first aspect, in one possible implementation, the connection point between the touch element and the reset element is located between the two ends of the touch element.

[0008] In conjunction with the first aspect, in one possible implementation, the collision mechanism further includes a connecting shaft that passes through the contact member, is fixedly connected to the housing, and the contact member is rotatably connected to the housing via the connecting shaft.

[0009] In conjunction with the first aspect, in one possible implementation, one end of the touch element that is hinged to the housing is located below the inner surface of the housing, and the other end of the touch element is located above the inner surface of the housing.

[0010] In conjunction with the first aspect, in one possible implementation, the touch element includes a rod extending in a direction parallel to the second direction, the rod being used to collide with the trigger element.

[0011] In conjunction with the first aspect, in one possible implementation, the contact element includes a rod extending in a direction parallel to the second direction, and the surface of the rod has a contact area located below the central axis of the rod.

[0012] In conjunction with the first aspect, in one possible implementation, the contact element further includes a connecting seat, one end of which is located below the inner surface of the housing and rotatably connected to the housing, and the other end of which protrudes from the inner surface of the housing and is connected to the rod.

[0013] In conjunction with the first aspect, in one possible implementation, in the second direction, the end of the rod furthest from the connector is closer to the hinge between the connector and the housing than the end of the rod closest to the connector.

[0014] Secondly, this application provides a 3D printer, which includes a housing, a 3D printing head, a guide, and a collision mechanism as described in the first aspect. The guide is connected to the housing, the 3D printing head is slidably disposed on the guide, and a trigger in the 3D printing head is used to collide with the collision mechanism.

[0015] In conjunction with the second aspect, in one possible implementation, the lifting mechanism includes a gear, a rack is fixed on the first hot end assembly, and the gear meshes with the rack;

[0016] The lifting mechanism also includes a first rotating shaft, and the triggering element includes a lever. The first rotating shaft passes through and is fixed to the gear. One end of the lever is used to be fixedly connected to the first rotating shaft, and the other end of the lever is used to collide with the contacting element.

[0017] In conjunction with the second aspect, in one possible implementation, the contact element includes a rod for colliding with the trigger element, the rod extending in a direction parallel to the second direction, and the 3D printing head having a clearance groove along the extension direction of the rod.

[0018] In conjunction with the second aspect, in one possible implementation, the trigger is located in the clearance slot.

[0019] In conjunction with the second aspect, in one possible implementation, the 3D printing head further includes a first base detachably connected to the first hot end assembly, the connecting frame having an abutment member, the first base and the abutment member being movably abutted together, and the abutment member and the first base being magnetically engaged;

[0020] The contact element includes a rod extending in a direction parallel to a second direction, and the surface of the rod has a contact area located below the central axis of the rod.

[0021] In this solution, the collision mechanism is installed on the housing of the 3D printer. The collision mechanism includes a contact element and a reset element, which are connected to the housing. One end of the contact element is hinged to the housing, allowing the contact element to rotate relative to the housing. The axis of the hinge between the contact element and the housing is parallel to a first direction. When the collision mechanism collides with the trigger element of the lifting mechanism that moves along the first direction, it enables the passive lifting of the first hot end component in the 3D printing head. When the collision mechanism collides with the trigger element of the lifting mechanism that moves along a direction other than the first direction, the contact element can rotate relative to the housing, reducing the collision force on the 3D printing head and acting as a buffer to protect the 3D printing head. The reset element enables the contact element to reset after rotating relative to the housing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a 3D printer provided in one embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of a 3D printing head provided in one embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the structure of a first extrusion assembly provided in an embodiment of this application;

[0025] Figure 4 for Figure 3 Top view of the first extrusion assembly;

[0026] Figure 5 This is a schematic diagram of the structure of a second extrusion assembly provided in an embodiment of this application;

[0027] Figure 6 A partial structural schematic diagram of a 3D printing head provided in one embodiment of this application;

[0028] Figure 7 A schematic diagram of the structure when the 3D printing head collides with the collision mechanism according to an embodiment of this application;

[0029] Figure 8 for Figure 7 A partial schematic diagram;

[0030] Figure 9 This is a schematic diagram of a collision mechanism provided in one embodiment of this application;

[0031] Figure 10 This is a schematic diagram of another collision mechanism provided in an embodiment of this application;

[0032] Figure 11 This is a schematic diagram of the connection between the lifting mechanism and the first hot end assembly according to an embodiment of this application;

[0033] Figure 12 This is a schematic diagram of the structure of a first hot-end component located at a first position according to an embodiment of this application;

[0034] Figure 13 A schematic diagram of the structure of the first hot end component located at the second position according to an embodiment of this application;

[0035] Figure 14 This is a structural schematic diagram of a connecting frame connecting lifting mechanism provided in an embodiment of this application;

[0036] Figure 15 A partial structural schematic diagram of a 3D printing head provided in one embodiment of this application from another perspective;

[0037] Figure 16 A partial structural schematic diagram of a 3D printing head provided in one embodiment of this application;

[0038] Figure 17 This is a partial structural schematic diagram of a 3D printing head provided in one embodiment of this application. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0040] Please see Figure 1 This application provides a 3D printer 1, which may include a first extrusion assembly 11, a drive member 12, a guide member 14 and a 3D printing head 13. The first extrusion assembly 11 and the 3D printing head 13 are separated. The 3D printing head 13 is slidably disposed on the guide member 14, and the drive member 12 is connected to the 3D printing head 13 in a transmission connection.

[0041] Please see Figure 2The 3D printing head 13 includes a connecting frame 131, a first hot-end assembly 132, a second hot-end assembly 133, and a second extrusion assembly 134. The first hot-end assembly 132, the second hot-end assembly 133, and the second extrusion assembly 134 are connected to the connecting frame 131. The first extrusion assembly 11 drives a first feed line 2 to convey the first feed line 2 to the first hot-end assembly 132, and the second extrusion assembly 134 drives a second feed line 3 to convey the second feed line 3 to the second hot-end assembly 133. At least one of the first hot-end assembly 132 and the second hot-end assembly 133 is movably connected to the connecting frame 131. For example, the first hot-end assembly 132 is movably connected to the connecting frame 131, and the second hot-end assembly 133 is fixedly connected to the connecting frame 131. Alternatively, the first hot-end assembly 132 is movably connected to the connecting frame 131, and the second hot-end assembly 133 is also movably connected to the connecting frame 131. The 3D printing head 13 also includes an extrusion front shell, which is detachably connected to the connector 131.

[0042] In some feasible implementations, the guide 14 can be a carbon rod or a linear guide, and the connecting frame 131 is provided with a through hole for the carbon rod or linear guide to pass through, thereby realizing the sliding connection of the 3D printing head 13 to the guide 14.

[0043] In the embodiments provided in this application, the 3D printer 1 may further include a processing platform, on which the 3D print head 13 prints the product during printing. During the printing process, the first hot-end component 132 heats the first filament 2 to a molten state and then sprays the molten filament onto the processing platform to process the product. The second hot-end component 133 heats the second filament 3 to a molten state and then sprays the molten second filament 3 onto the processing platform to process the product. The processing platform can be raised and lowered; as the printed product gradually thickens during printing, the processing platform can gradually descend to ensure that the 3D print head 13 remains above the product. The above description pertains to core xy structure 3D printers. In some feasible implementations, in cantilever or gantry 3D printers, the first and second hot-end components can heat the filament to a molten state and spray it onto the processing platform. During the process of the hot-end components spraying the molten filament onto the processing platform, the processing platform can move along the y-axis, while the 3D print head moves up and down along the Z-axis and along the X-axis to achieve the processing of three-dimensional objects. The accompanying drawings of this application use a core xy structure 3D printer as an example and do not constitute a limitation on the 3D printer structure of this application. The solution of this application can be applied to other structures such as cantilever and gantry 3D printers.

[0044] The 3D printing head 13 can switch between using the first hot end assembly 132 and the second hot end assembly 133, thereby switching the material line ejected onto the processing platform to form a product. For example, a product can be formed by processing a first wire 2 and a second wire 3. By using the 3D printing head 13 to switch between the first hot end component 132 and the second hot end component 133, the first wire 2 and the second wire 3 can be melted alternately (wherein, the first hot end component 132 can heat the first wire 2 to make it molten, and the second hot end component 133 can heat the second wire 3 to make it molten). The first hot end component 132 sprays the molten first wire 2 onto the processing platform, and the second hot end component 133 sprays the molten second wire 3 onto the processing platform. The molten first wire 2 and the second hot end component 133 form a product on the processing platform, thereby improving processing efficiency and reducing waste. This is because by adding hot end components, different hot end components can be used to heat different wires. For example, heating wires of different colors eliminates the need to increase rinsing time and waste rinsing wire to clean the residue of the previous wire in the hot end component.

[0045] For example, when printing a product, the 3D printing head 13 ejects material through the first hot end assembly 132 or the second hot end assembly 133. The driving member 12 drives the 3D printing head 13 to move along a preset trajectory. The driving member 12 can drive the 3D printing head 13 to move along a first direction (e.g., the X-axis direction) or a second direction (e.g., the Y-axis direction). When the first hot end assembly 132 is ejecting the first molten material line 2, the 3D printing head 13 moves along a portion of the preset trajectory. When the second hot end assembly 133 is ejecting the second molten material line 3, the 3D printing head 13 moves along another portion of the preset trajectory.

[0046] In the embodiments provided in this application, when the first hot-end assembly 132 is in the first molten material line 2 in the sprayed state, the first material line 2 can be conveyed to the first hot-end assembly 132 by the first extrusion assembly 11. For details, please refer to... Figure 3 and Figure 4 The first extrusion assembly 11 includes a first motor 111, an extrusion wheel 112, and an extrusion wheel 113. The first motor 111 is drivenly connected to the extrusion wheel 112. In some feasible embodiments, the first motor 111 may be drivenly connected to the extrusion wheel 113. Alternatively, the first motor 111 may be drivenly connected to both the extrusion wheel 112 and the extrusion wheel 113.

[0047] For example, the outer peripheral surface of extrusion wheel 112 may be spaced apart from the outer peripheral surface of extrusion wheel 113. A gap is formed between extrusion wheel 112 and extrusion wheel 113 for the first feed line 2 to pass through, and the first feed line 2 contacts the outer peripheral surfaces of both extrusion wheel 112 and extrusion wheel 113 simultaneously, with both outer peripheral surfaces jointly clamping the first feed line 2. First motor 111 drives extrusion wheel 112 to rotate, and the first feed line 2 is conveyed through the clamping friction of extrusion wheel 112 and extrusion wheel 113, for example, conveying the first feed line 2 from the first extrusion assembly 11 to the first hot end assembly 132. Alternatively, first motor 111 drives extrusion wheel 112 and extrusion wheel 113 simultaneously, and the first feed line 2 is conveyed to the first hot end assembly 132 through the clamping and conveying of the first feed line 2 by extrusion wheel 112 and extrusion wheel 113.

[0048] When the second hot-end assembly 133 is in the second molten material line 3, the second material line 3 can be conveyed to the second hot-end assembly 133 through the second extrusion assembly 134. (See also...) Figure 5 The second extrusion assembly 134 includes a second motor 1341, an extrusion wheel 1342, and an extrusion wheel 1343. The second motor 1341 drives the extrusion wheel 1342 to rotate. The outer peripheral surface of the extrusion wheel 1342 is spaced apart from the outer peripheral surface of the extrusion wheel 1343. The gap between the outer peripheral surfaces of the extrusion wheel 1342 and the extrusion wheel 1343 allows the second feed line 3 to pass through. The second feed line 3 is in contact with both the outer peripheral surfaces of the extrusion wheel 1342 and the extrusion wheel 1343, and the outer peripheral surfaces of both wheels clamp the second feed line 3 together. The second motor 1341 drives the extrusion wheel 1342 to rotate. Through the clamping friction of the extrusion wheel 1342 and the extrusion wheel 1343 on the second feed line 3, the second feed line 3 is conveyed, for example, from the second extrusion assembly 134 to the second hot end assembly 133. Alternatively, the second motor 1341 can simultaneously drive the extrusion wheel 1342 and the extrusion wheel 1343 to rotate, and convey the second material line 3 to the second hot end assembly 133 by clamping and conveying it through the extrusion wheel 1342 and the extrusion wheel 1343.

[0049] In this application, the 3D printer 1 has two extrusion components. The second extrusion component 134 is disposed in the 3D print head 13, that is, the second extrusion component 134 is disposed close to the second hot end component 133. The first extrusion component 11 is not disposed in the 3D print head 13, that is, the first extrusion component 11 is disposed relatively far from the first hot end component 132. It can be seen that the 3D printer provided in this application can include a dual hot end printer with one near-field extrusion and one far-field extrusion. When the drive member 12 drives the 3D print head 13, the first extrusion component 11 does not need to move with the 3D print head 13 on the guide member 14, which can reduce the output burden of the drive member 12 in driving the 3D print head 13. The fact that the first extrusion component 11 is not integrated into the 3D print head 13 can also reduce the size and weight of the 3D print head 13, avoid the 3D print head 13 being too bulky under the drive of the drive member 12, and improve the movement speed of the 3D print head 13 when printing products. Therefore, this application can achieve the benefits of dual-hot-end printers, such as improved processing efficiency and reduced waste, while avoiding the problems caused by existing dual-hot-end printers that place both extrusion components on the 3D print head, such as the 3D print head being too bulky and large, resulting in a decrease in the movement speed of the 3D print head 13 and a decrease in control precision.

[0050] In the embodiments provided in this application, the 3D printer 1 is also connected to a feeding device. The first hot end assembly 132 and the second hot end assembly 133 in the 3D print head 13 are respectively connected to the feeding device through the first feed tube 1a and the second feed tube 1b. The feeding device can accommodate the first feed line 2 and the second feed line 3. The feeding device can release the first feed line 2 and the second feed line 3. The first feed line 2 extends from the feeding device, passes through the first feed tube 1a, and is conveyed to the first hot end assembly 132 by the first extrusion assembly 11. The first hot end assembly 132 heats the first feed line 2 and sprays the molten first feed line 2. The first extrusion assembly 11 can drive the first feed line 2 and convey the first feed line 2 to the first hot end assembly 132. The second feed line 3 extends from the feeding device, passes through the second feed tube 1b, and is conveyed by the second extrusion assembly 134 to the second hot end assembly 133. The second hot end assembly 133 heats the second feed line 3 and sprays the molten second feed line 3. The second extrusion assembly 134 can drive the second feed line 3 and convey the second feed line 3 to the second hot end assembly 133.

[0051] In a 3D print head with dual hot-end components, the position of the hot-end component in the working state is lower than the position of the hot-end component in the idle state. For example, when the 3D print head 13 uses the first hot-end component 132 to spray the first molten material filament 2, the lowest point of the second hot-end component 133 is higher than the lowest point of the first hot-end component 132. During the movement of the 3D print head 13, the drive member 12 can prevent interference (e.g., collision) between the second hot-end component 133 and the product. When processing the product, the lowest point of the first hot-end component 132 is slightly higher than the product to improve processing accuracy. If the lowest point of the second hot-end component 133 is lower than the lowest point of the first hot-end component 132, the lowest point of the second hot-end component 133 may be lower than the product, causing interference between the 3D print head 13 and the product during movement.

[0052] When the 3D printing head 13 uses the second hot end component 133 to spray the second material line 3 in a molten state, the lowest point of the first hot end component 132 needs to be higher than the lowest point of the second hot end component 133. This can prevent the lowest point of the first hot end component 132 from being lower than the product. During the movement of the 3D printing head 13, interference (e.g., collision) between the first hot end component 132 and the product can be prevented.

[0053] In the embodiments provided in this application, the first hot-end component 132 is movably connected to the connecting frame 131, and the second hot-end component 133 is fixedly connected to the connecting frame 131. By changing the relative position of the first hot-end component 132 and the connecting frame 131, for example, by raising and lowering the first hot-end component 132 relative to the processing platform on the connecting frame 131, the relative height of the first hot-end component 132 and the second hot-end component 133 can be changed. For example, when the 3D printing head 13 uses the first hot-end component 132 to eject the first material line 2, the relative position of the first hot-end component 132 and the connecting frame 131 can be adjusted so that the lowest point of the first hot-end component 132 is lower than the lowest point of the second hot-end component 133. When the 3D printing head 13 uses the second hot-end component 133 to eject the second material line 3, the relative position of the first hot-end component 132 and the connecting frame 131 can be adjusted so that the lowest point of the first hot-end component 132 is higher than the lowest point of the second hot-end component 133. It is understood that the height difference between the first hot-end assembly 132 and the second hot-end assembly 133 is in the Z-axis direction. Implementing this application, the use of a liftable, movable first hot-end assembly 132 in conjunction with a remote extrusion assembly, such as a first extrusion assembly, ensures the printing effect of the fixed first hot-end assembly 132 and the near-field extrusion second hot-end assembly 133. This is particularly suitable for using the first hot-end assembly 132 to spray support material and the second hot-end assembly 133 to spray the main body components of the 3D product. This is because the first extrusion assembly 11 is relatively far from the first hot-end assembly 132, making it difficult to control the feed rate of the first material line 2 and guarantee print quality. However, it can be used to print support parts that need to be disassembled from the main body of the product, without affecting the appearance of the 3D product due to print quality issues.

[0054] In some embodiments, the 3D printing head 13 further includes a lifting mechanism 135 connected to the connecting frame 131. The lifting mechanism can be connected to at least one of the first hot end assembly 132 and the second hot end assembly 133. For example, please refer to [link to example]. Figure 6 and Figure 7 The 3D printing head 13 also includes a lifting mechanism 135 connected to the connecting frame 131. Figure 6 The following description uses the connection between the lifting mechanism 135 and the first hot-end component 132 as an example. Optionally, in some other embodiments, the lifting mechanism 135 may be connected to the second hot-end component 133. The 3D printer 1 may also include a housing 15 and a collision mechanism 16. The lifting mechanism 135 includes a trigger 1351, which is used to collide with the collision mechanism 16 to drive the hot-end component movably connected to the connecting frame 131 to move up and down. The collision mechanism 16 is mounted on the housing 15.

[0055] In the embodiments provided in this application, the housing 15 may include a base 151, and a processing platform is connected to the base 151. For example, the processing platform may be connected to the base 151 via a lead screw or a slider. The 3D printing head 13 may move relative to the housing 15 along at least one of a first direction (e.g., the X-axis direction) and a second direction (e.g., the Y-axis direction), wherein the first direction and the second direction are perpendicular to each other.

[0056] Please see Figure 8 , Figure 9 and Figure 10 The collision mechanism 16 includes a contact member 161 and a reset member 162. One end of the contact member 161 is hinged to the housing 15, and the axis of hinge between the contact member 161 and the housing 15 is parallel to a first direction, for example, taking the first direction as the X-axis direction. The other end of the contact member 161 is used to collide with the trigger member 1351 in the 3D printing head 13 moving along the first direction, so as to drive the first hot end assembly 132 to rise and fall. The contact member 161 and the reset member 162 are connected to the housing 15, and the reset member 162 includes an elastic member 1621 or a magnetic suction member. One end of the contact member 161 that is hinged to the housing 15 is located below the upper surface of the base 151, and the other end of the contact member 161 is located above the inner surface of the housing 15.

[0057] Specifically, the collision mechanism 16 is connected to the base 151, one end of the contact member 161 is hinged to the base 151, and the other end of the contact member 161 protrudes from the upper surface of the base 151 for collision with the trigger member 1351 in the 3D printing head 13 moving in the first direction. It can be understood that the end of the contact member 161 hinged to the base 151 is located below the upper surface of the base 151, and the other end of the contact member 161 is located above the upper surface of the base 151.

[0058] The contact 161 is connected to the base 151 via the reset member 162. When the contact 161 rotates relative to the base 151, the reset member 162 can return the contact 161 to its initial state.

[0059] In one feasible implementation, a reset member 162 is connected between the contact member 161 and the base 151. The reset member 162 is an elastic member 1621. When the contact member 161 is subjected to an external force (e.g., an impact from the 3D printing head 13 in a second direction), the elastic member 1621 can elastically deform. When the external force on the contact member 161 disappears, the elastic member 1621 resets, allowing the contact member 161 to return to its initial state. During the 3D printing process, the 3D printing head 13 may experience a step loss failure, impacting the contact member 161 in a second direction, such as the Y-axis direction. To prevent damage to the 3D printing head due to collision with the collision mechanism 16, the contact member 161 is equipped with a highly compliant reset member 162 in the second direction, where a large impact force is not required to be provided to the trigger member 1351, instead of a highly rigid contact member. This allows the contact member 161 to absorb the collision force in the second direction when the 3D printing head experiences a step loss failure.

[0060] In one feasible implementation, the reset member 162 is a magnetic suction member 1622, which includes a first magnetic part 16221 and a second magnetic part 16222. The first magnetic part 16221 is disposed on the housing 15, and the second magnetic part 16222 is disposed on the contact member 161. In the initial state, the first magnetic part 16221 and the second magnetic part 16222 are attracted together. When the contact member 161 is subjected to an external force (e.g., an impact from the 3D printing head 13 in a second direction), the external force overcomes the magnetic attraction between the first magnetic part 16221 and the second magnetic part 16222, and the first magnetic part 16221 and the second magnetic part 16222 separate. When the external force on the contact member 161 disappears, the first magnetic part 16221 and the second magnetic part 16222 are attracted together again by magnetic force. Optionally, the magnetic component 1622 may include a magnetic component and a metal component, wherein the magnetic component is disposed in the housing 15 and the metal component is disposed in the contact component 161.

[0061] In this embodiment, the housing 15 and the contact member 161 are connected by a reset member 162. When the contact member 161 is subjected to external force, the reset member 162 can act as a buffer, which can reduce the collision force on the 3D printing head 13 when it comes into contact with the contact member 161, thus protecting the 3D printing head 13.

[0062] When the 3D print head 13 switches hot-end components via the lifting mechanism 135, for example, switching from ejecting printing material from the first hot-end component 132 to ejecting printing material from the second hot-end component 133, or vice versa, the 3D print head 13 can be manually moved to a set position, and then collided with the contact member 161 along a first direction. The contact member 161 then collided with the trigger member 1351, causing the contact member 161 to actuate the trigger member 1351. The movement of the trigger member 1351 can cause either the first hot-end component 132 or the second hot-end component 133 to rise or fall, or the trigger member 1351 can cause one of the first hot-end components 132 and the second hot-end component 133 to rise while the other falls. This ensures that the component with the lower position among the first hot-end components 132 and the second hot-end component 133 ejects printing material.

[0063] In the embodiments provided in this application, the trigger 1351 collides with the collision mechanism 16, causing the lifting mechanism 135 to passively lift and lower, thereby driving one of the first hot-end components 132 or the second hot-end components 133 to lift and lower. Compared to active lifting, which requires a motor in the 3D print head to switch the lifting and lowering of the hot-end components, and some even require a motor to clamp the material line to cooperate with the lifting and lowering of the hot-end components, this application uses passive lifting and lowering of the hot-end components, eliminating the need to set up a motor in the 3D print head other than the extrusion component, making the 3D print head lightweight, small in size, and easy to control.

[0064] In some embodiments, the reset member 162 is connected between the contact member 161 and the housing 15 along a second direction or a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other. It should be noted that the perpendicularity mentioned in this embodiment does not necessarily mean absolute perpendicularity. For example, the first direction and the second direction are perpendicular to each other, and the angle between the first direction and the second direction is allowed to have a 10% error, and the angle between the first direction and the second direction can be between 81° and 99°. Similarly, the angle between the first direction and the third direction is allowed to have a 10% error, and the angle between the first direction and the third direction can be between 81° and 99°.

[0065] In the embodiments provided in this application, the reset member 162 is connected to the contact member 161 and the housing 15 along a third direction, and the connection position between the reset member 162 and the contact member 161 is located between the two ends of the contact member 161.

[0066] The collision mechanism 16 also includes a connecting shaft 163, which passes through the contact member 161. The connecting shaft 163 is fixedly connected to the housing 15, and the contact member 161 is rotatably connected to the housing 15 through the connecting shaft 163.

[0067] The axial direction of the connecting shaft 163 is parallel to the first direction. The connecting shaft 163 connects the contact member 161 and the outer shell 15, allowing the contact member 161 and the outer shell 15 to rotate relative to each other. At the same time, the connecting shaft 163 can restrict the position of the contact member 161 and the outer shell 15 in the first direction. When the trigger member 1351 in the 3D printing head 13 moves along the first direction and collides with the contact member 161, the contact member 161 and the outer shell 15 will not produce relative displacement, which can ensure that the contact member 161 has relatively strong rigidity in the first direction. When the contact member 161 and the trigger member 1351 collide, the force generated mainly acts on the trigger member 1351 to drive the lifting mechanism 135 to perform lifting and lowering movements, which is beneficial to the state switching of the lifting mechanism 135.

[0068] In the embodiments provided in this application, the touch member 161 includes a rod portion 1611, the extension direction of which is parallel to the second direction, and the rod portion 1611 is used to collide with the trigger member 1351. The extension direction of the rod portion 1611 is parallel to the second direction, which facilitates collision with the trigger member 1351 moving in the first direction.

[0069] The contact element 161 includes a rod 1611, the extension direction of which is parallel to the second direction. The surface of the rod 1611 has a contact area 16111, the position of which is lower than the position of the central axis d of the rod 1611. Since the position of the contact area 16111 is lower than the position of the central axis of the rod 1611, when the trigger element 1351 collides with the rod 1611, the rod 1611 will exert a force with a downward component on the trigger element 1351, ensuring stable contact between the trigger element 1351 and the rod 1611, driving the trigger element 1351 to rotate, thereby switching the first hot end assembly 132 from the second position to the first position.

[0070] The contact element 161 also includes a connecting seat 1612. One end of the connecting seat 1612 is located below the inner surface of the housing 15 and is rotatably connected to the housing 15. The other end of the connecting seat 1612 protrudes from the inner surface of the housing 15 and is connected to the rod 1611. Since the rod 1611 collides with the trigger element 1351, the surface of the rod 1611 has high requirements for strength and smoothness. The connection between the rod 1611 and the housing 15 via the connecting seat 1612 can reduce the machining area of ​​the surface of the rod 1611.

[0071] In the second direction, the end of the rod 1611 furthest from the connecting seat 1612 is closer to the hinge between the connecting seat 1612 and the base 151 than the end of the rod 1611 closest to the connecting seat 1612. The side of the rod 1611 facing the hinge is also the side facing the 3D printing head. The 3D printing head 13 can move above the connecting seat 1612. The size of the connecting seat 1612 does not need to occupy the depth dimension of the 3D printer 1. When the 3D printing head 13 moves in the second direction and collides with the end of the rod 1611 furthest from the connecting seat 1612, the contact member 161 rotates relative to the outer shell 15. The end of the contact member 161 protruding from the upper surface of the base 151 will sink down, without occupying the printing space constructed by the 3D printer 1. The printing space constructed by the 3D printer 1 refers to the space required by the 3D printing head 13 when printing the product.

[0072] In the embodiments provided in this application, in order to reduce the probability of collisions between non-trigger components of the 3D printing head 13 and the rod 1611, the 3D printing head 13 is provided with a clearance groove 136 along the extension direction of the rod 1611. The trigger component 1351 is located within the clearance groove 136 and protrudes beyond other non-trigger components of the 3D printing head 13. During the movement of the 3D printing head 13 towards the location of the collision mechanism 16 in the first direction, the trigger component in the 3D printing head 13 collides with the rod 1611, while other components of the 3D printing head 13, excluding the trigger component, do not collide or contact the rod 1611. In the embodiments provided in this application, the clearance groove 136 can avoid the collision mechanism, thereby reducing the probability of the 3D printing head 13 colliding with the collision mechanism 16 in directions other than the first direction. For example, during the movement of the 3D printing head 13 towards the location of the collision mechanism 16 in the second direction, the 3D printing head 13 can avoid the rod 1611 of the collision mechanism 16 through the avoidance groove 136. The trigger 1351 can be a rod-shaped structure, such as a lever. In this way, the trigger 1351 occupies less space in the avoidance groove 136. If the 3D printing head 13 moves towards the location of the collision mechanism 16 in the second direction, the trigger 1351 is less likely to collide with the rod 1611. In other words, even if the 3D printing head moves towards the location of the collision mechanism 16 in the second direction, the avoidance groove 136 provides fault tolerance space for the 3D printing head and the collision mechanism. For example, if the 3D printing head makes a slight misstep, the avoidance groove can prevent the 3D printing head from colliding with the collision mechanism, thus avoiding damage to both due to the collision.

[0073] In one feasible implementation, please refer to Figure 11The lifting mechanism 135 is connected to the first hot-end component 132. The first hot-end component 132 and the second hot-end component 133 are spaced apart. The second hot-end component 133 is fixed to the connecting frame 131. The lifting mechanism 135 is used to drive the first hot-end component 132 to move up and down. The first hot-end component 132 moves up and down along the Z-axis. By driving the first hot-end component 132 to move up and down through the lifting mechanism 135, the height position of the first hot-end component 132 is changed, thereby changing the relative height position of the first hot-end component 132 and the second hot-end component 133. In another feasible implementation, the lifting mechanism 135 is connected to the first hot end component 132 and also to the second hot end component 133. When the lifting mechanism 135 raises the first hot end component 132, it also raises the second hot end component 133. When the lifting mechanism 135 raises the second hot end component 133, it also raises the first hot end component 132. The first hot end component 132 and the second hot end component 133 can be connected to the two ends of the lifting mechanism 135 respectively.

[0074] Please see Figure 12 and Figure 13 In the embodiments provided in this application, the 3D printing head 13 further includes a connecting frame 131a that is detachably connected to the connecting frame 131, and a lifting mechanism 135 that is rotatably connected to the connecting frame 131a. The lifting mechanism 135 changes the height position of the first hot end assembly 132 and the second hot end assembly 133 by rotating relative to the connecting frame 131a.

[0075] In the embodiments provided in this application, during the lifting and lowering movement of the first hot-end component 132, the trajectory of the first hot-end component 132 includes a first position and a second position. The first position is lower than the second position. The first position can be the lowest position of the first hot-end component 132 during the lifting and lowering movement. When the first hot-end component 132 is in the first position, it is used to spray molten printing material (first feed line 2). The second position can be the highest position of the first hot-end component 132 during the lifting and lowering movement. When the second hot-end component 133 is fixedly connected to the connecting frame 131, the first position is lower than the location of the second hot-end component 133, and the second position is higher than the location of the second hot-end component 133. When the first hot-end component 132 is in the second position, it is used to spray molten printing material (second feed line 3).

[0076] In some embodiments, please continue to see Figure 11The lifting mechanism 135 includes a gear 1352, and a rack 1321 is fixedly connected to the first hot end assembly 132. The gear 1352 meshes with the rack 1321. The lifting mechanism 135 also includes a first rotating shaft 1353. The trigger 1351 includes a lever. The first rotating shaft 1353 passes through the gear 1352 and is fixed to the gear 1352. The trigger 1351 is fixedly connected to the first rotating shaft 1353. Specifically, one end of the lever is fixedly connected to the first rotating shaft 1353, and the other end of the lever is used to collide with the contact member 161.

[0077] When the lever collides with the collision mechanism 16, the lever is actuated. The lever drives the gear 1352 to rotate via the first rotating shaft 1353. During the rotation, the gear 1352 drives the rack 1321 to rise and fall, thereby driving the first hot end assembly 132 to rise and fall.

[0078] In some embodiments, the lifting mechanism 135 includes a drive wheel, a driven wheel, and a transmission belt. The drive wheel is connected to a trigger 1351, and the drive wheel and the driven wheel are connected by transmission belt. The trigger 1351 collides with the collision mechanism 16. The trigger 1351 can drive the drive wheel to rotate and drive the transmission belt to move up and down. The transmission belt can be connected to the first hot end assembly 132 and drive the first hot end assembly 132 to move up and down.

[0079] In some embodiments, the lifting mechanism 135 may include a cam and a push rod. The cam may be hinged to the push rod. The end of the push rod away from the cam is connected to the first hot end assembly 132. The cam is also connected to a trigger 1351. The trigger 1351 collides with the collision mechanism 16 to drive the cam to rotate. When the cam rotates, the end of the push rod away from the cam can move up and down in a straight line, thereby driving the first hot end assembly 132 to move up and down.

[0080] In some embodiments, the first hot-end component 132 is detachably connected to a first mounting position and a second mounting position of the connecting frame 131. When the first hot-end component 132 is detachably connected to the first mounting position, its position is lower than that of the second hot-end component 133. When the first hot-end component 132 is detachably connected to the second mounting position, its position is higher than that of the second hot-end component 133. When the first hot-end component 132 is detachably connected to the first mounting position, the 3D printing head 13 can use the first hot-end component 132 to spray molten printing material (first feed line 2). When the first hot-end component 132 is not mounted on the connecting frame 131 or is detachably connected to the second mounting position, the 3D printing head 13 can use the second hot-end component 133 to spray molten printing material (second feed line 3).

[0081] In some embodiments, please combine Figure 11 , Figure 12 and Figure 13The lifting mechanism 135 may include a gear 1352, a second rotating shaft 1354, a first connecting rod 1355, a second connecting rod 1356, and a third connecting rod 1357. A rack 1321 is fixed to the first hot-end assembly 132, and the gear 1352 meshes with the rack 1321. The trigger 1351 includes a lever. The first rotating shaft 1353 and the second rotating shaft 1354 are spaced apart. The first end of the first connecting rod 1355 is hinged to the first rotating shaft 1353, the second end of the first connecting rod 1355 is hinged to the first end of the second connecting rod 1356, the second end of the second connecting rod 1356 is hinged to the first end of the third connecting rod 1357, and the second end of the third connecting rod 1357 is hinged to the second rotating shaft 1354. The first rotating shaft 1353 and the second rotating shaft 1354 are rotatably connected to the connecting frame 131a. The first rotating shaft 1353, the second rotating shaft 1354, the first connecting rod 1355, the second connecting rod 1356, and the third connecting rod 1357 can form a five-bar linkage, which can limit the rotation angle of the gear 1352, improve the motion accuracy of the lifting mechanism 135, and make the rotation process of the gear 1352 more stable.

[0082] In some embodiments, the lifting mechanism 135 further includes a plug 1358 connected to the second connecting rod 1356; the first hot end assembly 132 includes a first nozzle 1322 and a first heating block 1323, the first heating block 1323 is used to heat the first feed line 2 to a molten state, and the first nozzle 1322 is used to spray the molten first feed line 2; the second hot end assembly 133 includes a second nozzle 1331 and a second heating block 1332, the second heating block 1332 is used to heat the second feed line 3 to a molten state, and the second nozzle 1331 is used to spray the molten second feed line 3; the first nozzle 1322 and the second nozzle 1331 are spaced apart, when the first hot end assembly 132 is in the first position, the plug 1358 blocks the second nozzle 1331, and when the first hot end assembly 132 is in the second position, the plug 1358 blocks the first nozzle 1322. The first hot-end assembly 132 sprays molten first filament 2 onto the processing platform through the first nozzle 1322, and the second hot-end assembly 133 sprays molten second filament 3 onto the processing platform through the second nozzle 1331. During the process of switching the hot-end assembly of the 3D print head 13 to spray printing material, the lifting mechanism 135 moves so that the position of the hot-end assembly that needs to spray printing material is lower than the position of the hot-end assembly in the idle state (when no printing material is needed). For example, in the 3D print head 13, if the first hot-end assembly 132 that needs to spray printing material is switched to the second hot-end assembly 133, the trigger 1351 can collide with the collision mechanism 16, causing the lifting mechanism 135 to lift the first hot-end assembly 132 to the second position. At the same time, the plug 1358, which moves with the second connecting rod 1356, moves to the bottom of the first hot-end assembly 132 and seals the first hot-end assembly 132. If the second hot end assembly 133 that needs to spray printing material is switched to the first hot end assembly 132, the trigger 1351 can collide with the collision mechanism 16, causing the lifting mechanism 135 to drive the first hot end assembly 132 down to the second position. At the same time, the plug 1358 that moves with the second link 1356 moves to the bottom of the second hot end assembly 133 and seals the second hot end assembly 133.

[0083] Specifically, when the trigger 1351 collides with the collision mechanism 16, the trigger 1351 is actuated, which in turn drives the first rotating shaft 1353 to rotate. The rotation of the first rotating shaft 1353 drives the first connecting rod 1355 to swing, which in turn drives the second connecting rod 1356 to swing. The swing of the second connecting rod 1356 drives the nozzle plug 1358 to move. At the same time, the rotation of the first rotating shaft 1353 also drives the gear 1352 to rotate. The gear 1352 meshes with the rack 1321, and the gear 1352 drives the rack 1321 to rise and fall along the Z-axis, thereby causing the entire first hot end assembly 132 to rise and fall. When the first hot end assembly 132 moves to the first position, the nozzle plug 1358 moves with the second connecting rod 1356 to the bottom of the second nozzle 1331 and blocks the second nozzle 1331, preventing the second nozzle 1331 from spraying out the molten second material line 3. When the first hot end assembly 132 moves to the second position, the plug 1358 moves with the second connecting rod 1356 to the bottom of the first nozzle 1322 and blocks the first nozzle 1322 to prevent the first nozzle 1322 from spraying out the first material line 2 in a molten state.

[0084] The upper surface of the plug 1358 is provided with a silicone sheet 1359. When the first hot end assembly 132 is in the first position, the silicone sheet 1359 is in contact with the second nozzle 1331. When the first hot end assembly 132 is in the second position, the silicone sheet 1359 is in contact with the first nozzle 1322.

[0085] For example, the silicone sheet 1359 can form a soft wrap around the nozzle when it is necessary to seal the nozzle. The silicone sheet 1359 can effectively seal the nozzle. For instance, when the first hot end assembly 132 is in the first position, the silicone sheet 1359 contacts the second nozzle 1331, effectively sealing the second nozzle 1331. When the first hot end assembly 132 is in the second position, the silicone sheet 1359 contacts the first nozzle 1322, effectively sealing the first nozzle 1322. In addition, the silicone sheet 1359 can provide soft contact between the plug and the nozzle, avoiding damage to the nozzle due to excessive stiffness.

[0086] Please refer to the embodiments provided in this application. Figure 14The gear 1352 is equipped with a circular magnet 13521. Two sensors 1311 for detecting changes in the magnetic field are mounted on the connecting frame 131a, both located on the outer periphery of the circular magnet 13521 and perpendicularly positioned. The two sensors 1311 can be Hall effect sensors. When the circular magnet 13521 rotates, the two sensors 1311 generate pulse signals due to the change in the magnetic field. Since the two Hall effect sensors 1311 are positioned at 90°, they can sense the components of the rotating magnetic field in two orthogonal directions, and then calculate the rotation angle of the gear 1352 through mathematical calculations (usually an arctangent function). For example, the connecting frame 131a includes a circuit board, on which the two sensors 1311 can be placed. For example, the rotation angle of gear 1352 can be obtained by two sensors to determine whether the first shaft 1353 and the second shaft 1354 have rotated into place, thereby knowing whether the first hot end assembly 132 and the second hot end assembly 133 are in the right position.

[0087] In some embodiments, please combine Figure 11 and Figure 15 The 3D printing head 13 further includes a first base 137 detachably connected to the first hot end assembly 132, the first base 137 being slidably connected to the connecting frame 131a; and / or, the 3D printing head 13 further includes a second base 138 detachably connected to the second hot end assembly 133, the second base 138 being fixedly connected to the connecting frame 131a. The connecting frame 131a is movably connected to the first hot end assembly 132 via the first base 137, and the connecting frame 131a is detachably connected to the second hot end assembly 133 via the second base 138.

[0088] Specifically, one of the first base 137 and the connecting frame 131a is provided with a slide rail 1312 and the other is provided with a slide groove 1371, with the slide rail 1312 and the slide groove 1371 slidingly engaged.

[0089] In one feasible implementation, the first base 137 is provided with a slide rail 1312, and the connecting frame 131a is provided with a slide groove 1371, with the slide rail 1312 and the slide groove 1371 slidingly engaged. In another feasible implementation, the first base 137 is provided with a slide groove 1371, and the connecting frame 131a is provided with a slide rail 1312, with the slide rail 1312 and the slide groove 1371 slidingly engaged.

[0090] The connecting bracket 131a is provided with an abutment member 1313, which is disposed above the first base 137, and the first base 137 is in movable contact with the abutment member 1313. The abutment member 1313 is used to limit the extreme position of the first hot end assembly 132, wherein the extreme position of the first hot end assembly 132 can be a second position.

[0091] At least one of the abutment 1313 and the first base 137 is magnetic, and the other may have opposite magnetism or be metallic, so that the abutment 1313 and the first base 137 attract each other. Specifically, when the first hot end assembly 132 is in the second position, the abutment 1313 and the first base 137 are magnetically attracted, which allows the first hot end assembly 132 to remain stable in the second position, or when the first hot end assembly is still a little short of reaching the second position, the abutment 1313 can provide attraction to the first base 137, so that the first base 137 can move into position. In the embodiment provided in this application, during the process of the trigger 1351 colliding with the collision mechanism 16 to move the first hot end assembly 132 from the second position to the first position, the trigger 1351 contacts the contact area 16111 of the rod 1611 in the collision mechanism 16. Since the position of the contact area 16111 is lower than the position of the central axis of the rod 1611. The collision mechanism 16 can apply a downward force to the trigger 1351 to overcome the steady state of the first hot end assembly 132 in the second position and do work, so that the first hot end assembly 132 switches from the second position to the first position.

[0092] The abutment 1313 is magnetic, and the first base 137 is magnetic. The magnetism of the side of the abutment 1313 facing the first base 137 is different from the magnetism of the side of the first base 137 facing the abutment 1313; or, one of the abutment 1313 and the first base 137 is magnetic, and the other is metallic. If one of the abutment 1313 and the first base 137 is metallic, the metal can be iron, iron-containing alloys, nickel, nickel-containing alloys, cobalt, and cobalt-containing alloys, etc.

[0093] Please see Figure 16 and Figure 17 The connecting frame 131a is equipped with a first magnet 1314 and a second magnet 1315, and the second connecting rod 1356 is equipped with a third magnet 13561 or metal. When the first hot end assembly 132 is in the first position, the second magnet 1315 and the third magnet 13561 or metal of the second connecting rod 1356 are magnetically attracted, which can keep the first hot end assembly 132 in a stable state in the first position, so that the first hot end assembly 132 can spray a molten material line in a stable state. When the first hot end assembly is in the second position, the first magnet 1314 and the third magnet 13561 or metal of the second connecting rod 1356 are magnetically attracted, which can keep the first hot end assembly 132 in a stable state in the second position. When the second hot end assembly 133 sprays the molten material line 3, it can prevent the first hot end assembly 132 from descending and interfering with the product, thus affecting the product processing progress.

[0094] In some embodiments, the plug 1358 and the third magnet 13561 are located on opposite sides of the second link 1356, and the third magnet 13561 is closer to the connecting frame 131a in the Z-axis direction than the plug 1358.

[0095] In some embodiments, see Figure 13 The first base 137 connects at least one of the power line 1c and the signal line 1d. The first base 137 is provided with a wire tie 1372 for securing at least one of the power line 1c and the signal line 1d. The wire tie 1372 secures the power line 1c and the signal line 1d, preventing them from tangling. When the first hot-end assembly 132 moves up and down, the power line 1c and the signal line 1d move up and down with the first base 137, preventing the first hot-end assembly 132 from pulling on or damaging the power line 1c or the signal line 1d during the movement.

[0096] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0097] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0098] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0099] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0100] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A collision mechanism suitable for 3D printers, characterized in that, The 3D printer includes a 3D print head and a housing. The 3D print head is movable relative to the housing along at least one of a first direction and a second direction, wherein the first direction and the second direction are perpendicular to each other. The 3D print head includes a first hot end assembly, a second hot end assembly, and a connecting frame. The first hot end assembly is connected to the connecting frame via a lifting mechanism, and the second hot end assembly is connected to the connecting frame. The lifting mechanism includes a trigger. The collision mechanism is mounted on the housing and includes a contact element and a reset element. One end of the contact element is hinged to the housing, and the axis of hinge between the contact element and the housing is parallel to the first direction. The other end of the contact element is used to collide with a trigger element in the 3D printing head that moves along the first direction, so as to drive the first hot end assembly to rise and fall. The contact element and the reset element are connected to the housing, and the reset element includes an elastic element or a magnetic suction element.

2. The collision mechanism as described in claim 1, characterized in that, The reset member is connected between the contact member and the housing along the second direction or the third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

3. The collision mechanism as described in claim 1, characterized in that, The connection point between the touch element and the reset element is located between the two ends of the touch element.

4. The collision mechanism as described in claim 1 or 2, characterized in that, It also includes a connecting shaft that passes through the touch element and is fixedly connected to the housing. The touch element is rotatably connected to the housing via the connecting shaft.

5. The collision mechanism as described in claim 4, characterized in that, One end of the contact element that is hinged to the housing is located below the inner surface of the housing, and the other end of the contact element is located above the inner surface of the housing.

6. The collision mechanism as described in claim 5, characterized in that, The touch element includes a rod portion extending in a direction parallel to the second direction, and the rod portion is used to collide with the trigger element.

7. The collision mechanism as described in claim 1, characterized in that, The contact element includes a rod extending in a direction parallel to the second direction. The surface of the rod has a contact area located below the central axis of the rod.

8. The collision mechanism as described in claim 7, characterized in that, The contact element also includes a connector, one end of which is located below the inner surface of the housing and is rotatably connected to the housing, and the other end of which protrudes from the inner surface of the housing and is connected to the rod.

9. The collision mechanism as described in claim 8, characterized in that, In the second direction, the end of the rod away from the connector is closer to the hinge between the connector and the housing than the end of the rod closer to the connector.

10. A 3D printer, characterized in that, The device includes a housing, a 3D printing head, a guide, and a collision mechanism as described in any one of claims 1-8, wherein the guide is connected to the housing, the 3D printing head is slidably disposed on the guide, and a trigger in the 3D printing head is used to collide with the collision mechanism.

11. The 3D printer as claimed in claim 10, characterized in that, The lifting mechanism includes a gear, and a rack is fixed on the first hot end assembly, with the gear meshing with the rack. The lifting mechanism further includes a first rotating shaft, and the triggering element includes a lever. The first rotating shaft passes through the gear and is fixed to the gear. One end of the lever is used to be fixedly connected to the first rotating shaft, and the other end of the lever is used to collide with the contact element.

12. The 3D printer as described in claim 10, characterized in that, The contact element includes a rod portion for colliding with a trigger element. The extension direction of the rod portion is parallel to the second direction, and the 3D printing head is provided with a clearance groove along the extension direction of the rod portion.

13. The 3D printer as described in claim 12, characterized in that, The trigger is located in the clearance slot.

14. The 3D printer as described in claim 10, characterized in that, The 3D printing head also includes a first base detachably connected to the first hot end assembly. The connecting frame is provided with an abutment member. The first base and the abutment member are movably abutted together, and the abutment member and the first base are magnetically attracted to each other. The contact element includes a rod extending in a direction parallel to the second direction. The surface of the rod has a contact area located below the central axis of the rod.

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