Spray head positioning mechanism

Abstract

The utility model discloses a spray head positioning mechanism which comprises a spray head and a spray head dock, the spray head is installed on the spray head dock, the spray head dock is provided with a fixed positioning pin and a floating positioning pin, the spray head is provided with a fixed positioning pin hole and a floating positioning pin hole, the floating positioning pin can circumferentially deflect around a central shaft, and the fixed positioning pin is matched with the fixed positioning pin hole. And the floating positioning pin is matched with the floating positioning pin hole. A positioning pin for fixing the nozzle through the nozzle dock is designed to be floating, so that the positioning precision required when the nozzle seat grabs or places the nozzle is reduced, and meanwhile, the machining and mounting precision of each part can also be reduced.

Description

Technical Field

[0001] The utility model belongs to the field of 3D printing, and particularly relates to a nozzle positioning mechanism. Background Art

[0002] An FDM (Fused Deposition Modeling) 3D printer melts the printing consumables by heating the printing nozzle at a high temperature and deposits them on the printing platform. When the melted printing consumables contact the printing platform, they quickly solidify upon cooling. The printing nozzle deposits the printing consumables layer by layer along the set printing path onto the printing platform, thereby constructing a model with a three-dimensional structure.

[0003] In related technologies, multiple nozzles are fixed by a nozzle dock to achieve 3D printing with multiple materials. In most related solutions, the nozzles are placed in the nozzle dock through two fixed pin shafts. Due to the influence of part processing and installation accuracy, during the alignment process of the nozzle seat and the nozzle, the nozzle seat, the nozzle, and the nozzle dock are not coaxial, resulting in jamming during the guiding process of the nozzle seat and the nozzle. In severe cases, the motor may lose steps, leading to failure in grasping or placing the nozzle. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a nozzle positioning mechanism, which designs the positioning pins for fixing the nozzle in the nozzle dock to be floating, reducing the positioning accuracy required when the nozzle seat grasps or places the nozzle, and at the same time, reducing the processing and installation accuracy of each part.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The nozzle positioning mechanism includes a nozzle and a nozzle dock. The nozzle is installed in the nozzle dock. The nozzle dock is provided with a fixed positioning pin and a floating positioning pin. The nozzle is provided with a fixed positioning pin hole and a floating positioning pin hole. The floating positioning pin can circumferentially deflect around the central axis. The fixed positioning pin matches the fixed positioning pin hole, and the floating positioning pin matches the floating positioning pin hole.

[0007] The floating positioning pin circumferentially deflects around the central axis, so it can circumferentially deflect a certain distance according to the position of the floating positioning pin hole, preventing jamming during the installation process of the nozzle and the nozzle dock.

[0008] Further, the floating positioning pin includes a base, a floating positioning pin body, and a bearing structure. The floating positioning pin body is installed in the installation groove of the base, and the bearing structure is provided circumferentially on the floating positioning pin body.

[0009] The floating positioning pin body can circumferentially deflect around the central axis through the bearing structure, keeping the floating positioning pin body perpendicular to the end face of the nozzle dock, facilitating the alignment of the floating positioning pin with the floating positioning pin hole.

[0010] Further, the floating positioning pin body includes a floating positioning pin rod and a limiting ring surrounding the floating positioning pin rod, and the bearing structure is matched with the limiting ring.

[0011] The floating positioning pin rod makes a circumferential deflection around the central axis through the bearing structure and the limiting ring.

[0012] Further, the bearing structure includes a first bearing and a second bearing, and the first bearing and the second bearing are respectively installed on opposite sides of the limiting ring.

[0013] The functions of the first bearing and the second bearing are to limit the floating positioning pin rod axially and only allow it to float radially.

[0014] Further, the floating positioning pin further includes an elastic ring, the elastic ring abuts between the limiting ring and the side wall of the installation groove, and the elastic ring is arranged on the outer circumference of the limiting ring.

[0015] The elastic ring is used to provide a certain elasticity so that the floating positioning pin can return to its position within a certain range.

[0016] Further, an elastic member is provided in the gap between the installation groove and the second bearing, one side of the elastic member abuts against the second bearing, and the other side of the elastic member abuts against the bottom surface of the installation groove.

[0017] The elastic member abuts against the second bearing and provides a pre-tightening force to install the second bearing in the limiting ring.

[0018] Further, it further includes a nozzle seat, and the nozzle can be installed on the nozzle seat.

[0019] The nozzle seat is used to grip the nozzle.

[0020] Further, the nozzle dock is provided with a baffle, the floating positioning pin is floatingly arranged on the baffle, penetrates through the baffle and extends towards the side where the nozzle seat is located, the fixed positioning pin is fixed on the baffle and extends towards the side where the nozzle seat is located, and the floating positioning pin rod is perpendicular to the end face where the baffle is located.

[0021] The baffle is used to abut against the first bearing to install the first bearing in the limiting ring.

[0022] Due to the adoption of the above technical solutions, the present utility model has the following beneficial effects:

[0023] 1. Nozzle gripping: When the nozzle seat needs to grip a specified nozzle, the nozzle seat moves to the placement position of the specified nozzle in the nozzle dock, the nozzle seat positions and locks with the nozzle. Since the nozzle is placed in the nozzle dock and can circumferentially deflect a certain distance around the floating positioning pin, there will be no jamming phenomenon during the guiding process between the nozzle seat and the nozzle.

[0024] 2. Placement of the nozzle: When the nozzle holder needs to place the grabbed nozzle back into the nozzle dock, the nozzle holder moves the nozzle to the designated position. After being guided by the fixed positioning pin and the floating positioning pin, the nozzle holder separates from the nozzle to achieve nozzle placement. Brief Description of the Drawings

[0025] The following further describes the present utility model with reference to the drawings.

[0026] Figure 1 It is a schematic structural diagram of the nozzle, nozzle holder and nozzle dock.

[0027] Figure 2 It is a schematic structural diagram of the nozzle.

[0028] Figure 3 It is a schematic structural diagram of the floating positioning pin.

[0029] Figure 4 It is an exploded view of the floating positioning pin.

[0030] Figure 5 It is a sectional view of the floating positioning pin. Detailed Description of the Embodiment

[0031] As shown in Figure 1 the nozzle positioning mechanism includes a nozzle 1 and a nozzle dock 2. The nozzle 1 is installed on the nozzle dock 2, and the nozzle 1 can be picked up and placed through a nozzle holder 3. The nozzle dock 2 is provided with a baffle 4. The floating positioning pin is floatingly arranged on the baffle 4 and extends through the baffle 4 towards the side where the nozzle holder 3 is located. The fixed positioning pin 5 is fixed to the baffle 4 and extends towards the side where the nozzle holder 3 is located. As shown in Figure 1 the nozzle dock 2 is provided with a fixed positioning pin 5 and a floating positioning pin 6. As shown in Figure 2 the nozzle 1 is correspondingly provided with a fixed positioning pin hole 7 and a floating positioning pin hole 8. The floating positioning pin 6 can deflect circumferentially around the central axis. The fixed positioning pin 5 matches the fixed positioning pin hole 7, and the floating positioning pin 6 matches the floating positioning pin hole 8.

[0032] As shown in Figures 3 to 5 the floating positioning pin 6 includes a base 61, an elastic ring 62, a disc spring 63, a floating positioning pin body 64 and a bearing structure. The floating positioning pin body 64 is installed in the installation groove 9 of the base 61, and the floating positioning pin body 64 is circumferentially provided with a bearing structure. The floating positioning pin body 64 includes a floating positioning pin rod 65 and a limit ring 66 arranged on the outer periphery of the floating positioning pin rod 65. The bearing structure includes an upper bearing 67 and a lower bearing 68. The upper bearing 67 and the lower bearing 68 are respectively installed on the upper and lower sides of the limit ring 66. The floating positioning pin body 64, the fixed positioning pin 5 and the end face where the baffle 4 is located are perpendicular to each other.

[0033] As shown in Figure 5As shown, the installation groove 9 includes a first groove 91 and a second groove 92 that are interconnected. The first groove 91 is closer to the baffle 4 than the second groove 92, and the groove width of the first groove 91 is greater than that of the second groove 92. The elastic ring 62 is abutted between the limiting ring 66 and the side wall of the first groove 91, and the elastic ring 62 is arranged on the outer periphery of the limiting ring 66. A disc spring 63 is provided in the gap between the second groove 92 and the lower bearing 68. One side of the disc spring 63 abuts against the lower bearing 68, and the other side of the disc spring 63 abuts against the bottom surface 92 of the second groove 92. The baffle 4 abuts against the upper bearing 67 to install the upper bearing 67 in the limiting ring 66.

[0034] The floating positioning pin 6 can circumferentially deflect around the central axis through the bearing structure. Therefore, it can circumferentially deflect a certain distance according to the position of the floating positioning pin hole 8, so that the floating positioning pin body 64 is perpendicular to the end face of the nozzle dock 2, which is convenient for the floating positioning pin 6 to align with the floating positioning pin hole 8, and there will be no jamming phenomenon during the installation process of the nozzle 1 and the nozzle dock 2.

[0035] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present invention.

Claims

1. Sprinkler positioning mechanism, characterized in that: It includes a nozzle and a nozzle dock. The nozzle is installed on the nozzle dock. The nozzle dock is provided with a fixed positioning pin and a floating positioning pin. The nozzle is provided with a fixed positioning pin hole and a floating positioning pin hole. The floating positioning pin can circumferentially deflect around the central axis. The fixed positioning pin matches the fixed positioning pin hole, and the floating positioning pin matches the floating positioning pin hole.

2. The nozzle positioning mechanism according to claim 1, characterized in that: The floating positioning pin includes a base, a floating positioning pin body and a bearing structure. The floating positioning pin body is installed in the installation groove of the base, and the bearing structure is circumferentially arranged on the floating positioning pin body.

3. The nozzle positioning mechanism according to claim 2, wherein: The floating positioning pin body includes a floating positioning pin rod and a limiting ring surrounding the floating positioning pin rod. The bearing structure matches the limiting ring.

4. The nozzle positioning mechanism according to claim 3, wherein: The bearing structure includes a first bearing and a second bearing. The first bearing and the second bearing are respectively installed on opposite sides of the limiting ring.

5. The nozzle positioning mechanism according to claim 3, characterized in that: The floating positioning pin further includes an elastic ring. The elastic ring abuts between the limiting ring and the side wall of the installation groove, and the elastic ring is arranged on the outer circumference of the limiting ring.

6. The nozzle positioning mechanism according to claim 4, wherein: An elastic member is provided in the gap between the installation groove and the second bearing. One side of the elastic member abuts against the second bearing, and the other side of the elastic member abuts against the bottom surface of the installation groove.

7. The nozzle positioning mechanism according to claim 3, wherein: It further includes a nozzle seat, and the nozzle can be installed on the nozzle seat.

8. The nozzle positioning mechanism according to claim 7, wherein: The nozzle dock is provided with a baffle. The floating positioning pin is floatingly arranged on the baffle and extends through the baffle towards the side where the nozzle seat is located. The fixed positioning pin is fixed on the baffle and extends towards the side where the nozzle seat is located. The floating positioning pin rod is perpendicular to the end surface where the baffle is located.

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