Diameter-variable drill bit

Abstract

The utility model discloses a variable-diameter drill bit, which comprises a drill handle, a plurality of first hinge parts and a plurality of second hinge parts, a plurality of second hinging parts are arranged at the end part of the head part; the variable-diameter assembly comprises a plurality of variable-diameter units, each variable-diameter unit comprises a first variable-diameter arm and a second variable-diameter arm which are rotatably connected, and sliding grooves are formed in the first variable-diameter arms and the second variable-diameter arms in the length directions of the first variable-diameter arms and the second variable-diameter arms; a supporting rod is arranged between any two adjacent reducing units in a sliding mode. According to the variable-diameter drill bit, the supporting rod is arranged between any two adjacent variable-diameter units, and when the drill bit drills holes, the supporting rod transversely supports the first variable-diameter arm and the second variable-diameter arm, so that transverse stress of the first variable-diameter arm and the second variable-diameter arm can be greatly reduced, and the first variable-diameter arm and the second variable-diameter arm are prevented from being damaged due to excessive transverse stress; the strength of the whole drill bit is improved, the service life of the drill bit is prolonged, and materials with higher strength can be drilled.

Description

TECHNICAL FIELD

[0001] The utility model relates to drilling equipment technical field especially relates to a variable diameter drill bit. BACKGROUND

[0002] Drill bit is used for making hole in various materials, is widely used in mechanical processing, building, woodworking etc. industry. In order to satisfy different needs, part drill bit will set up multiple rotatable arm, the arm rotates and can change the cutting diameter of drill bit, to realize the variable diameter function of drill bit.

[0003] However, since multiple rotatable arms are not directly connected, when the drill bit is drilling, multiple rotatable arms will bear large lateral reaction force, resulting in bending or breaking of these rotatable arms. Therefore, the above-mentioned drill bit with variable diameter function is usually limited by the strength of the drilling material due to low strength. SUMMARY

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a variable diameter drill bit to solve the problem of damage of variable diameter arm in the prior art due to excessive lateral stress.

[0005] The utility model solves its technical problem and adopts the technical scheme of a variable diameter drill bit, comprising:

[0006] A drill shank, the end portion of which is provided with a plurality of first hinged portions;

[0007] A head portion, the end portion of which is provided with a plurality of second hinged portions;

[0008] A variable diameter assembly, comprising a plurality of variable diameter units, the variable diameter unit comprising a first variable diameter arm and a second variable diameter arm rotatably connected, one end of the first variable diameter arm away from the second variable diameter arm is hinged with the first hinged portion, one end of the second variable diameter arm away from the first variable diameter arm is hinged with the second hinged portion; wherein the first variable diameter arm and the second variable diameter arm are both provided with a sliding groove along the length direction thereof;

[0009] A support rod is arranged between any two adjacent variable diameter units, one end of the support rod is slidably arranged in the sliding groove of one of the variable diameter units, the other end of the support rod is slidably arranged in the sliding groove of the other variable diameter unit.

[0010] Further, two support rods are arranged between any two adjacent variable diameter units, one of the support rods is arranged between two first variable diameter arms, and the other support rod is arranged between two second variable diameter arms.

[0011] Further, both ends of the support rod are provided with locking bolts for locking sliding along the sliding groove.

[0012] Further, the drill handle is connected with the first variable diameter arm through a hinge, the first variable diameter arm is connected with the second variable diameter arm through a hinge, and the second variable diameter arm is connected with the head through a hinge.

[0013] Further, the hinge has a rotatably connected first connecting plate and a second connecting plate, and the outer sides of the first connecting plate and the second connecting plate are provided with wear-resistant strips.

[0014] Further, the wear-resistant strips are located at one end of the first connecting plate close to the second connecting plate or at one end of the second connecting plate close to the first connecting plate.

[0015] Further, eight variable diameter units are arranged between the drill handle and the head, and the eight variable diameter units are uniformly arranged along the circumference of the drill handle.

[0016] Further, a hydraulic rod is further included, a cylinder body of the hydraulic rod is arranged in the drill handle, and a telescopic rod of the hydraulic rod extends out of the drill handle and is fixed to the head.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] Support rods are arranged between any two adjacent variable diameter units, when the drill bit is drilling, the support rods transversely support the first variable diameter arm and the second variable diameter arm, the transverse stress of the first variable diameter arm and the second variable diameter arm can be greatly reduced, the first variable diameter arm and the second variable diameter arm are prevented from being damaged due to too large transverse stress, the strength of the whole drill bit is improved, the service life thereof is prolonged, and the drill bit can also drill higher strength materials. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a schematic view of the variable diameter drill bit when the variable diameter units in the embodiment are not expanded;

[0020] Fig. 2 It is a schematic view of the variable diameter drill bit when the variable diameter units in the embodiment are expanded;

[0021] IN THE DRAWINGS:

[0022] 100, drill handle;

[0023] 200, head;

[0024] 300, variable diameter unit; 310, first variable diameter arm; 311, sliding groove; 320, second variable diameter arm; 330, support rod; 340, hydraulic rod. DETAILED DESCRIPTION

[0025] The utility model discloses the specific embodiments of the utility model are as follows and further describe the technical scheme of the utility model in connection with the drawings, but the utility model is not limited to these embodiments.

[0026] Please refer to Figs. 1-2 The utility model discloses a variable diameter drill bit, including:

[0027] Drill handle 100, its end is equipped with a plurality of first hinged parts;

[0028] Head 200, its end is equipped with a plurality of second hinged parts;

[0029] Variable diameter assembly, including a plurality of variable diameter unit 300, variable diameter unit 300 includes rotatable connection's first variable diameter arm 310 and second variable diameter arm 320, the first variable diameter arm 310 is away from the second variable diameter arm 320 one end and the first hinged part articulates, and the second variable diameter arm 320 is away from the first variable diameter arm 310 one end and the second hinged part articulates, wherein, the first variable diameter arm 310 and the second variable diameter arm 320 all are along its length direction and are provided with sliding slot 311;

[0030] Supporting rod 330 is arranged between any two adjacent variable diameter unit 300, and one end of the supporting rod 330 is slidably arranged in the sliding slot 311 of one of the variable diameter unit 300, and the other end of the supporting rod 330 is slidably arranged in the sliding slot 311 of the other variable diameter unit 300.

[0031] The application expands or reduces the drill diameter of the drill bit by rotating the first variable diameter arm 310 and the second variable diameter arm 320, and realizes the variable diameter function of the drill bit.

[0032] Importantly, the application is provided with the supporting rod 330 between any two adjacent variable diameter unit 300, and when the drill bit drills a hole, the supporting rod 330 transversely supports the first variable diameter arm 310 and the second variable diameter arm 320, can greatly reduce the transverse stress of the first variable diameter arm 310 and the second variable diameter arm 320, to prevent the first variable diameter arm 310 and the second variable diameter arm 320 from being damaged due to excessive transverse stress, improve the strength of the whole drill bit, prolong its service life, and also can drill holes in higher strength materials.

[0033] Specifically, in order to ensure that the supporting rod 330 has sufficient supporting force, the supporting rod 330 is set as an integral non-stretchable rod. Such non-stretchable structure has the following problems: when the variable diameter unit 300 is unfolded, the spacing between the two first variable diameter arms 310 or the two second variable diameter arms 320 will change, and if the two ends of the supporting rod 330 cannot slide along the sliding slot 311, the variable diameter unit 300 will be pulled by the supporting rod 330 when unfolded and cannot be unfolded.

[0034] Based on this, the application sets a sliding groove 311 on the first variable diameter arm 310 and the second variable diameter arm 320, which is arranged along the length direction of the first variable diameter arm 310 / second variable diameter arm 320. When the variable diameter unit 300 is unfolded, the support rod 330 can slide to different positions along the sliding groove 311 to ensure that the variable diameter unit 300 can be smoothly unfolded and retracted.

[0035] At the same time, assuming that the drill bit is in a vertical state, if the length of the support rod 330 is exactly equal to the distance between two adjacent variable diameter units 300 in the non-unfolded state, then when the variable diameter unit 300 is unfolded, the support rod 330 still cannot slide along the sliding groove 311 to adapt to the increase in the distance between the two variable diameter units 300.

[0036] Based on this, the length of the support rod 330 needs to be slightly larger than the distance between the two variable diameter units 300 in the non-unfolded state, so that the support rod 330 can slide along the sliding groove 311 when the variable diameter unit 300 is unfolded. When the first variable diameter arm 310 and the second variable diameter arm 320 are not unfolded, the first variable diameter arm 310 and the second variable diameter arm 320 are flush with the edge of the shank 100. At this time, the support rod 330 needs to have a certain inclination angle.

[0037] Further, two support rods 330 are arranged between any two adjacent variable diameter units 300, one of which is arranged between the two first variable diameter arms 310, and the other is arranged between the two second variable diameter arms 320.

[0038] Specifically, in order to improve the strength of the entire drill bit, a support rod 330 is arranged between any two adjacent first variable diameter arms 310, and a support rod 330 is arranged between any two adjacent second variable diameter arms 320, to ensure that each first variable diameter arm 310 and each second variable diameter arm 320 can be effectively laterally supported.

[0039] Further, both ends of the support rod 330 are provided with locking bolts for locking the sliding of the support rod 330 along the sliding groove 311.

[0040] Specifically, during the variable diameter process, the two ends of the support rod 330 slide along the sliding groove 311 until the variable diameter process is completed, and then the locking bolts at the two ends of the support rod 330 are tightened to lock the sliding of the end of the support rod 330 in the sliding groove 311, ensuring that the support rod 330 always maintains a fixed position and provides continuous and effective lateral support when the drill bit is drilling.

[0041] Further, the shank 100 is connected to the first variable diameter arm 310 by a hinge, the first variable diameter arm 310 is connected to the second variable diameter arm 320 by a hinge, and the second variable diameter arm 320 is connected to the head 200 by a hinge.

[0042] Further, the hinge has rotatably connected first and second connecting plates, and an anti-wear strip is arranged on the outer side of each of the first and second connecting plates.

[0043] Specifically, the anti-wear strip is welded on the outer side of the first and second connecting plates, and when drilling, the anti-wear strip is in contact with the drilled base material, thereby avoiding direct contact between the hinge and the base material and wear, and prolonging the service life of the hinge.

[0044] Further, the anti-wear strip is arranged at one end of the first connecting plate close to the second connecting plate, or at one end of the second connecting plate close to the first connecting plate.

[0045] Specifically, when the variable-diameter unit 300 is unfolded, the outermost part is the hinge between the first variable-diameter arm 310 and the second variable-diameter arm 320, and the hinge is the hinge between the first connecting plate and the second connecting plate. Therefore, the anti-wear strip is arranged close to the hinge, which can ensure that the anti-wear strip bears most of the cutting wear and plays a protective role for the hinge.

[0046] Further, eight variable-diameter units 300 are arranged between the drill handle 100 and the head 200, and the eight variable-diameter units 300 are uniformly arranged along the circumference of the drill handle 100.

[0047] The eight variable-diameter units 300 are uniformly arranged, so that they can bear force uniformly and avoid damage due to excessive force on a single variable-diameter unit 300.

[0048] Further, a hydraulic rod 340 is further included, a cylinder body of the hydraulic rod 340 is arranged in the drill handle 100, and a telescopic rod of the hydraulic rod 340 extends out of the drill handle 100 and is fixed to the head 200.

[0049] Specifically, the head 200 is moved through the telescopic movement of the hydraulic rod 340, and the head 200 drives all the variable-diameter units 300 to unfold or contract, thereby realizing the variable-diameter function.

[0050] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0051] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0052] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

Claims

1. A variable gauge drill bit, comprising: The utility model relates to a drill handle, a head, a variable diameter assembly, a hydraulic rod and a drill bit. The drill handle has a plurality of first hinged parts at its end; The head has a plurality of second hinged parts at its end; The variable diameter assembly comprises a plurality of variable diameter units, each of which comprises a first variable diameter arm and a second variable diameter arm rotatably connected, the first variable diameter arm being hinged to the first hinged part at its end away from the second variable diameter arm, and the second variable diameter arm being hinged to the second hinged part at its end away from the first variable diameter arm; wherein each of the first variable diameter arm and the second variable diameter arm has a sliding groove along its length direction; Between any two adjacent variable diameter units, a support rod is provided, one end of the support rod being slidably arranged in the sliding groove of one of the variable diameter units, and the other end of the support rod being slidably arranged in the sliding groove of the other variable diameter unit.

2. A variable diameter drill bit according to claim 1 wherein, Between any two adjacent variable diameter units, two support rods are provided, one of the support rods being arranged between the two first variable diameter arms, and the other support rod being arranged between the two second variable diameter arms.

3. The variable diameter drill bit of claim 1, wherein, Both ends of the support rod are provided with locking bolts for locking the sliding of the support rod along the sliding groove.

4. The variable diameter drill bit of claim 1, wherein, The drill handle is connected to the first variable diameter arm through a hinge, the first variable diameter arm is connected to the second variable diameter arm through a hinge, and the second variable diameter arm is connected to the head through a hinge.

5. A variable diameter drill bit according to claim 4 wherein, The hinge has a first connecting plate and a second connecting plate rotatably connected, and the outer sides of the first connecting plate and the second connecting plate are provided with wear-resistant strips.

6. A variable diameter drill bit according to claim 5 wherein, The wear-resistant strips are located at the end of the first connecting plate close to the second connecting plate, or at the end of the second connecting plate close to the first connecting plate.

7. The variable diameter drill bit of claim 1, wherein, Between the drill handle and the head, eight variable diameter units are provided, which are uniformly arranged along the circumference of the drill handle.

8. The variable diameter drill bit of claim 1, wherein, The utility model also comprises a hydraulic rod, the cylinder of the hydraulic rod being arranged in the drill handle, and the telescopic rod of the hydraulic rod extending out of the drill handle and being fixed to the head.

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