Ball head fixing structure and parallel arm using same

Abstract

The utility model discloses a ball head fixing structure and a parallel arm using the same, the ball head fixing structure comprises a connector, the connector is connected with a positioning plate, the positioning plate crimps a ball head in the connector, arc-shaped grooves matched with the ball head in appearance are arranged in the connector and the positioning plate, and a first elastic piece is arranged between the positioning plate and the connector; the utility model has the beneficial effects that through the arrangement of the positioning plate, not only can the ball head be easily placed into the connector, but also the ball head can be tightly pressed, so that the ball head is prevented from being separated from the connector.

Description

Technical Field

[0001] The utility model relates to the field of 3D printing equipment, in particular to a ball head fixing structure and a parallel arm using the structure. Background Art

[0002] 3D printing, also known as additive manufacturing (AM), is a type of rapid prototyping technology. It is a direct manufacturing technology based on digital model files that can produce three-dimensional entities of almost any shape. 3D printing uses powdered metal or plastic and other bondable materials to construct objects by stacking and accumulating layer by layer, which is called "additive manufacturing".

[0003] Among the existing 3D printing equipment, the mainstream structures include cross-axis type, gantry type, XZ-Y plate type, parallel arm type, etc. Among them, the parallel arm type 3D printer is popular due to its advantages such as easy leveling, fast nozzle movement speed and accurate arc movement. The 3D printer with parallel arm structure connects the sliding component and the extruder through three parallel arm groups. The ball head of the parallel arm is connected to the main slide rail and the print head of the printer. During the printing process, as the parallel arm moves up and down, left and right, and forward and backward, the ball head needs to rotate continuously. After long-term use, a gap is likely to appear at the connection between the ball head and the parallel arm connector, which leads to poor printing quality.

[0004] In addition, during the assembly of the parallel arm, the ball head is currently installed into the connector by crimping, which requires a press machine, making the assembly process more complicated. Summary of the invention

[0005] The utility model aims to provide a ball head fixing structure and a parallel arm using the structure, which can not only conveniently install the ball head into the connecting head, but also avoid the occurrence of a gap at the connection between the ball head and the connecting head after long-term use, thereby improving printing accuracy.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A ball head fixing structure comprises a connecting head, a ball head mounting structure is arranged on the connecting head, a positioning plate is detachably connected to the connecting head at the ball head mounting structure, and the positioning plate is pressed into the ball head mounting structure of the connecting head.

[0008] Preferably, the ball head mounting structure and the positioning plate are both provided with an arc-shaped groove matching the shape of the ball head.

[0009] Preferably, a first elastic member is provided between the positioning plate and the connecting head.

[0010] Preferably, bolts are passed through the side wall of the positioning plate, and bolt holes matching the bolts are provided on the connecting head;

[0011] The bolts are screwed into the bolt holes to achieve connection between the positioning plate and the connecting head.

[0012] Preferably, bolts are passed through the side wall of the connector, and bolt holes matching the bolts are provided on the positioning plate;

[0013] The bolts are screwed into the bolt holes to achieve connection between the positioning plate and the connecting head.

[0014] Preferably, a protruding threaded portion is provided on one side of the connector close to the positioning plate, and an internal thread matching the threaded portion is provided on one side of the positioning plate close to the connector;

[0015] The threaded portion is screwed into the internal thread to achieve the connection between the positioning plate and the connecting head.

[0016] Preferably, a protruding threaded portion is provided on one side of the positioning plate close to the connecting head, and an internal thread matching with the threaded portion is provided on one side of the connecting head close to the positioning plate;

[0017] The threaded portion is screwed into the internal thread to achieve the connection between the positioning plate and the connecting head.

[0018] The utility model also discloses a parallel arm, comprising a first link arm and a second link arm arranged in parallel, the first link arm and the second link arm are connected by a second elastic member, and the first link arm and the second link arm have the same structure;

[0019] The first link arm comprises a connecting rod, and the aforementioned ball head fixing structure is arranged at the end of the connecting rod.

[0020] Preferably, a connecting rod hole for accommodating a connecting rod is provided in the connecting head;

[0021] The side wall of the connector is provided with a connecting slot for fixing the second elastic member, and the connecting slot is provided with a fixing hole connected to the end of the second elastic member.

[0022] The beneficial effects of the utility model are:

[0023] 1. By setting the positioning plate, not only can the ball head be easily placed in the connector, but the ball head can also be pressed to prevent it from falling out of the connector.

[0024] 2. The first elastic member can ensure the tightness between the positioning plate and the connector, ensure that the surface of the ball head is evenly stressed, and improve the printing quality.

[0025] 3. When the ball head has a gap due to wear and tear, you can tighten the positioning plate again to press it against the surface of the ball head to ensure printing quality.

[0026] 4. The first link arm and the second link arm are connected by a second elastic member, which can prevent the ball pin from detaching from the 3D printer during printing, and form a parallelogram to ensure uniform force. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the first embodiment of the utility model;

[0028] Figure 2 It is a cross-sectional view of the first embodiment of the utility model;

[0029] Figure 3 It is a three-dimensional diagram of the second embodiment of the utility model;

[0030] Figure 4 It is a cross-sectional view of the second embodiment of the utility model;

[0031] Figure 5 It is a three-dimensional diagram of the third embodiment of the present utility model.

[0032] The reference numerals are as follows:

[0033] 1. Connecting head 11, connecting rod hole 12, bolt hole 13, threaded portion 2, ball head 3, positioning plate 4, connecting slot 41, fixing hole 5, bolt 6, first elastic member 7, first connecting arm 71, connecting rod 8, second connecting arm 9, second elastic member.

[0034] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0035] The utility model is further described below in conjunction with the accompanying drawings.

[0036] Embodiment 1

[0037] like Figure 1 and Figure 2 As shown, a ball head fixing structure of an embodiment of the utility model includes a connecting head 1, a ball head mounting structure is arranged on the connecting head 1, the connecting head 1 is connected to the positioning plate 3 by bolts 5, an arc-shaped groove matching the shape of the ball head 2 is arranged in the opposite side walls of the ball head mounting structure and the positioning plate 3, and the positioning plate 3 crimps the ball head 2 into the connecting head 1.

[0038] During the actual processing, a small part (no more than half) of the ball head 2 is accommodated in the connector 1 and the positioning plate 3 respectively. Since the ball head 2 is spherical, this ensures that the ball head 2 can be easily installed in the connector 1 and then tightened by the positioning plate 3, without the need to use a top press to press the ball head 2 into the connector 1.

[0039] In order to ensure that the positioning plate 3 presses the ball head 2 tightly, a first elastic member 6 is further provided between the positioning plate 3 and the connector 1. The first elastic member 6 can be a spring or a spring sheet to provide elastic force to the positioning plate 3.

[0040] In some structures, a bolt hole 12 may be provided on the connector 1, and the bolt 3 is inserted into the bolt hole 12 from one side of the positioning plate 3 to achieve connection between the positioning plate 3 and the connector 1;

[0041] Alternatively, a bolt hole 12 may be provided on the positioning plate 3, and the bolt 3 is inserted into the bolt hole 12 from one side of the connecting head 1 to achieve the connection between the two.

[0042] During use, when a gap appears between the ball head 2 and the positioning plate 3 or the connector 1 due to wear, the ball head 2 can be clamped again by tightening the bolt 3 to ensure the printing quality.

[0043] Embodiment 2

[0044] like Figure 3 and Figure 4 As shown, in this embodiment, the connection method between the positioning plate 3 and the connecting head 1 is adjusted, and the threaded portion 13 is directly protrudingly provided on the connecting head 1 or the positioning plate 3 .

[0045] In some structures, the threaded portion 13 is arranged on one side of the connector 1 close to the positioning plate 3. Correspondingly, an internal thread matching the threaded portion 13 is arranged in the positioning plate 3, so that the positioning plate 3 can be screwed onto the connector 1 to achieve the connection between the two.

[0046] Alternatively, the threaded portion 13 is disposed on the positioning plate 3 and an internal thread is disposed in the connector 1 to achieve connection between the two.

[0047] When the ball head 2 is worn, the ball head 2 can be clamped again by rotating the threaded portion 13 .

[0048] The other structures of this embodiment are consistent with those of the first embodiment.

[0049] Embodiment 3

[0050] like Figure 5As shown, the utility model also discloses a parallel arm, which is composed of a first link arm 7 and a second link arm 8 arranged in parallel. The first link arm 7 and the second link arm 8 are connected by a second elastic member 9. The second elastic member 9 can use a spring, a tension spring or other pull rope with telescopic function to form a parallelogram during printing, thereby ensuring that the parallel arm is evenly stressed and ensuring the printing effect.

[0051] The first link arm 7 and the second link arm 8 have the same structure and both include a connecting rod 71. The ball head fixing structure in embodiment 1 or embodiment 2 is provided at both ends of the connecting rod 71 to facilitate the assembly of the ball head 2 and ensure that the ball head 2 is always in close contact with the connecting head 1 during printing.

[0052] A connecting rod hole 11 is provided in the connector 1 , and the installation can be easily completed by inserting the connecting rod 71 into the connecting rod hole 11 .

[0053] A connecting slot 4 is provided on the side wall of the connector 1, and a fixing hole 41 is provided in the connecting slot 4. The fixing hole 41 is used to connect the end of the second elastic member 9, so that the second elastic member 9 can be installed and fixed between the two symmetrically arranged ball head fixing structures of the first link arm 7 and the second link arm 8.

[0054] The above embodiments do not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model belong to the protection scope of the technical solution of the utility model.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0056] If the words "first", "second" and so on are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the utility model and simplifying the description. Unless otherwise stated, the above words have no special meaning.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A ball head fixing structure, comprising a connecting head, on which a ball head mounting structure is arranged, characterized in that: The connecting head is detachably connected to a positioning plate at the ball head mounting structure, and the positioning plate is pressed into the ball head mounting structure of the connecting head.

2. A ball head fixing structure according to claim 1, characterized in that: The ball head mounting structure and the positioning plate are both provided with arc-shaped grooves matching the shape of the ball head.

3. The ball head fixing structure according to claim 1, characterized in that: A first elastic member is arranged between the positioning plate and the connecting head.

4. The ball head fixing structure according to claim 1, characterized in that: Bolts are passed through the side wall of the positioning plate, and bolt holes matching the bolts are arranged on the connecting head; The bolts are screwed into the bolt holes to achieve connection between the positioning plate and the connecting head.

5. The ball head fixing structure according to claim 1, characterized in that: Bolts are passed through the side wall of the connector, and bolt holes matching the bolts are arranged on the positioning plate; The bolts are screwed into the bolt holes to achieve connection between the positioning plate and the connecting head.

6. The ball head fixing structure according to claim 1, characterized in that: A protruding threaded portion is provided on one side of the connector close to the positioning plate, and an internal thread matching the threaded portion is provided on one side of the positioning plate close to the connector; The threaded portion is screwed into the internal thread to achieve the connection between the positioning plate and the connecting head.

7. The ball head fixing structure according to claim 1, characterized in that: A protruding threaded portion is provided on one side of the positioning plate close to the connecting head, and an internal thread matching with the threaded portion is provided on one side of the connecting head close to the positioning plate; The threaded portion is screwed into the internal thread to achieve the connection between the positioning plate and the connecting head.

8. A parallel arm, characterized in that: It comprises a first link arm and a second link arm arranged in parallel, the first link arm and the second link arm are connected by a second elastic member, and the first link arm and the second link arm have the same structure; The first link arm includes a connecting rod, and the end of the connecting rod is provided with a ball head fixing structure as described in any one of claims 1-7.

9. The parallel arm according to claim 8, characterized in that: The connecting head is provided with a connecting rod hole for accommodating a connecting rod; The side wall of the connector is provided with a connecting slot for fixing the second elastic member, and the connecting slot is provided with a fixing hole connected to the end of the second elastic member.

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