Double-clamping extrusion mechanism

Abstract

A double-clamping extrusion mechanism relates to the technical field of 3D printing and comprises a box body, a driving mechanism and a pressing mechanism, the box body is provided with an open hole for printing supplies to penetrate through, a driving mechanism is arranged on one side corresponding to the open hole, and a pressing mechanism is arranged on the other side corresponding to the open hole. The driving mechanism comprises two driving grooved wheels which are driven by a motor in the same direction, the two driving grooved wheels are correspondingly and rotationally connected with the box body, and the two driving grooved wheels are arranged up and down at an interval; the pressing mechanism comprises a swing rod with one end correspondingly hinged to the box body through a hinge shaft, and the aperture of a hinge hole, corresponding to the hinge shaft, of the swing rod is larger than the diameter of the hinge shaft. The positions, opposite to the two driving grooved wheels, of the swing rod are rotationally connected with pressing grooved wheels used for pressing the printing supplies on the corresponding driving grooved wheels. A pressing adjusting mechanism used for adjusting the pressing force of the swing rod is arranged on the side, away from the pressing grooved wheel, of the swing rod. The device can effectively adapt to the wire diameter error of the printing supplies in the feeding and printing process.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a double-clamping extrusion mechanism. Background Art

[0002] At present, the extrusion components of FDM printers are generally composed of a group of meshing clamping gear groups. There is a U-shaped groove on each gear part for clamping the filament for feeding. The U-shaped groove depth is designed according to the filament wire diameter based on the optimal gear meshing position, so that it can work normally with filaments with a fixed wire diameter. During the gear meshing process, due to the influence of the filament wire diameter and the assembly error of the parts, if it is too large, the gear meshing will be out of the gear pitch circle, and if it is too small, the U-shaped groove will not be able to clamp the filament. A key factor of the current FDM printer is that the 3D printing filament wire diameter comes in various sizes and has an error range. The extrusion components currently designed all ignore this error by default and extrude directly, which directly affects the extrusion quality. The gear meshing jump accelerates gear wear and damage. The above defects are problems that need to be solved urgently by those skilled in the art.

[0003] A Chinese patent (publication number: CN105922549A) discloses a 3D printing wire straightening robot; the patent includes a quick connector 1, a housing, a fixing screw, and a quick connector 2; gear 1 and gear 3 are respectively installed on the two shafts of the base and mesh with gear 2; the main extrusion wheel and the auxiliary extrusion wheel are respectively fixed on gear 1 and gear 3; the clamping bearing 1 and the clamping bearing 2 are respectively installed on the bearing frame; the spring is sleeved on the fixing screw, and the fixing screw is installed on the bearing frame through the hole of the base and can move relative to it; although the patent has two clamping bearings and two U-shaped extrusion wheels, the two clamping bearings are synchronously close to or away from the two U-shaped extrusion wheels, which makes it unable to effectively adapt to the wire diameter error of the printing consumables during the feeding and printing process. Utility Model Content

[0004] In order to overcome the deficiencies in the background technology, the utility model discloses a double-clamping extrusion mechanism.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0006] A double-clamping extrusion mechanism comprises a box body, a driving mechanism and a clamping mechanism; the box body is provided with an opening for allowing printing consumables to pass through, a driving mechanism is provided on one side corresponding to the opening, and a clamping mechanism is provided on the other side; the driving mechanism comprises two driving groove wheels driven in the same direction by a motor, the two driving groove wheels are rotatably connected to the box body, and the two driving groove wheels are arranged at intervals up and down; the clamping mechanism comprises a rocker arm hinged to the box body at one end through a hinge shaft, and the aperture of the hinge hole at the rocker arm corresponding to the hinge shaft is larger than the diameter of the hinge shaft; the rocker arm is rotatably connected to the positions of the two driving groove wheels with a clamping groove wheel for pressing the printing consumables onto the corresponding driving groove wheel; the side of the rocker arm away from the clamping groove wheel is provided with a clamping adjustment mechanism for adjusting the clamping force of the rocker arm.

[0007] Preferably, the compression adjustment mechanism comprises a screw connected to the box body with corresponding threads, a limit ring is provided on the screw body, and a spring is provided between the limit ring and the rocker arm.

[0008] Preferably, one end of the driving sheave is provided with gear teeth, and a driving gear driven by a motor is rotatably connected between the two driving sheaves, and the driving gear is correspondingly meshed with the gear teeth of the two driving sheaves.

[0009] Preferably, one end of the rocker arm facing away from the hinge axis extends out of the box body.

[0010] Preferably, the wheel circle of the driving sheave is provided with U-shaped teeth.

[0011] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0012] The utility model discloses a double-clamping extrusion mechanism with a simple structure, easy assembly and low production cost. All meshing gears in the driving mechanism are fixed structures, and there will be no floating meshing influence, thereby preventing gear wear. The rocker arm is rotatably connected to the positions of the two driving groove wheels, and is used to press the printing consumables onto the corresponding driving groove wheels, that is, the two pressing groove wheels can press the printing consumables onto the two driving groove wheels. Since the aperture of the hinge hole at the hinge shaft corresponding to the rocker arm is larger than the diameter of the hinge shaft, or the hinge hole at the hinge shaft corresponding to the rocker arm is a bar hole; a certain clamping activity gap is reserved at the bottom of the rocker arm in the clamping direction of the printing consumables, thereby ensuring that the two pressing groove wheels can press the printing consumables, and can effectively adapt to the line diameter error of the printing consumables during the feeding and printing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 Schematic diagram of the connection structure between the rocker arm and the hinge shaft;

[0015] Figure 3Schematic diagram of the driving mechanism.

[0016] In the figure: 1. Box body; 2. Driving groove wheel; 3. Articulated shaft; 4. Rocker arm; 5. Pressing groove wheel; 6. Screw; 7. Limiting ring; 8. Spring. DETAILED DESCRIPTION

[0017] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", and "right" indicating directions or positional relationships, they are only corresponding to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0018] Combined with attachment Figures 1 to 3 A double-clamping extrusion mechanism comprises a housing 1, a drive mechanism, and a clamping mechanism. The housing 1 forms the foundation of the entire double-clamping extrusion mechanism. The top and bottom of the housing 1 are provided with openings for the passage of printing consumables. The drive mechanism is located on one side of the opening, while the clamping mechanism is installed on the opposite side. Specifically, the printing consumables enter the housing 1 through the top opening and exit through the bottom opening, passing between the drive mechanism and the clamping mechanism. This design effectively ensures stable transmission of the printing consumables.

[0019] The drive mechanism comprises two drive sheaves 2 driven in the same direction by a motor. The two drive sheaves 2 are connected to the box body 1 in a corresponding rotational manner. The two drive sheaves 2 are spaced apart from each other, that is, the two drive sheaves 2 are driven by the motor to rotate synchronously in the same direction. In addition, in order to improve the efficiency and stability of power transmission, one end of each drive sheave 2 is provided with gear teeth. Figure 3 As shown, there is a driving gear directly driven by the motor between the two sheaves, and the driving gear is engaged with the gear teeth of the two driving sheaves 2, that is, the motor drives the driving gear to rotate, and the driving gear drives the two driving sheaves 2 to rotate synchronously in the same direction.

[0020] It is worth noting that the outer edge of the driving groove wheel 2 is designed to be U-shaped teeth. This design significantly increases the friction between the driving groove wheel 2 and the printing consumables, thereby improving the stability and accuracy of the printing consumables during transmission.

[0021] The clamping mechanism includes a rocker arm 4 hinged to the box body 1 at one end through a hinge shaft 3, and the aperture of the hinge hole at the rocker arm 4 corresponding to the hinge shaft 3 is larger than the diameter of the hinge shaft 3; the rocker arm 4 is rotatably connected to the positions of the two driving groove wheels 2, and is used to press the printing consumables onto the corresponding driving groove wheels 2, that is, the two pressing groove wheels 5 can press the printing consumables onto the two driving groove wheels 2. Since the aperture of the hinge hole at the rocker arm 4 corresponding to the hinge shaft 3 is larger than the diameter of the hinge shaft 3, or the hinge hole at the rocker arm 4 corresponding to the hinge shaft 3 is a bar hole; a certain clamping activity gap is reserved at the bottom of the rocker arm 4 in the clamping direction of the printing consumables, thereby ensuring that the two clamping groove wheels 5 can clamp the printing consumables, and can effectively adapt to the line diameter error of the printing consumables during the feeding and printing process.

[0022] To further enhance the functionality of the clamping mechanism, a clamping adjustment mechanism is added to the side of the rocker arm 4 away from the clamping sheave 5. Specifically, the clamping adjustment mechanism comprises a screw 6 threadedly connected to the housing 1. A stop ring 7 is provided on the shaft of the screw 6, and a spring 8 is positioned between the stop ring 7 and the rocker arm 4. By adjusting the screwing depth of the screw 6, the pushing force of the stop ring 7 on the spring 8 is adjusted, thereby enabling fine-tuning of the clamping force of the rocker arm 4 and ensuring stable and reliable transport of printing consumables.

[0023] For the convenience of user operation, the end of the swing lever 4 away from the hinge shaft 3 extends out of the box body 1. In this way, the user can manually pull the extended part of the swing lever 4 away from the drive mechanism, thereby easily completing the insertion or replacement of printing consumables.

[0024] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A double-clamping extrusion mechanism, characterized by: The invention comprises a box body (1), a driving mechanism and a pressing mechanism; the box body (1) is provided with an opening for allowing printing consumables to pass through, a driving mechanism is provided on one side corresponding to the opening, and a pressing mechanism is provided on the other side; the driving mechanism comprises two driving groove wheels (2) driven in the same direction by a motor, the two driving groove wheels (2) are rotatably connected to the box body (1), and the two driving groove wheels (2) are arranged at intervals up and down; the pressing mechanism comprises a swing rod (4) one end of which is hinged to the box body (1) through a hinge shaft (3), and the diameter of the hinge hole at the swing rod (4) corresponding to the hinge shaft (3) is larger than the diameter of the hinge shaft (3); the swing rod (4) is rotatably connected to the positions of the two driving groove wheels (2) with a pressing groove wheel (5) for pressing the printing consumables onto the corresponding driving groove wheel (2); a pressing adjustment mechanism for adjusting the pressing force of the swing rod (4) is provided on the side of the swing rod (4) away from the pressing groove wheel (5).

2. The double-clamping extrusion mechanism according to claim 1, wherein: The compression adjustment mechanism comprises a screw rod (6) connected to the box body (1) with corresponding threads, a limit ring (7) is provided on the screw rod (6), and a spring (8) is provided between the limit ring (7) and the rocker rod (4).

3. The double-clamping extrusion mechanism according to claim 1, wherein: One end of the driving sheave (2) is provided with gear teeth, and a driving gear driven by a motor is rotatably connected between the two driving sheaves (2), and the driving gear is correspondingly meshed with the gear teeth of the two driving sheaves (2).

4. The double-clamping extrusion mechanism according to claim 1, wherein: One end of the swing rod (4) facing away from the hinge shaft (3) extends out of the box body (1).

5. The double-clamping extrusion mechanism according to claim 1, wherein: The wheel circle of the driving sheave (2) is provided with U-shaped teeth.

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