Disc flat brush quick connecting rod structure for handheld gun drill

Abstract

The utility model relates to the technical field of gun drill brushing structures, in particular to a disc flat brush quick connecting rod structure for a handheld gun drill, which comprises a main body rod piece and is characterized in that the diameter of the main body rod piece is 150 + / -2mm, the main body rod piece comprises a hexagonal rod, one end of the hexagonal rod is connected with a main body sleeve, one end of the main body sleeve is connected with a sliding sleeve, and the other end of the main body sleeve is connected with a handle. A steel wire is arranged on one side of the interior of the sliding sleeve, an elastic limiting mechanism is arranged on one side of the steel wire, a magnetic sleeve is arranged on one side of the interior of the sliding sleeve, and magnetic steel is arranged in the magnetic sleeve. Rapid replacement is achieved through magnetic attraction pre-positioning and elastic secondary locking, and a tool hole is automatically centered through magnetic attraction force guiding; after the 65Mn steel spring is subjected to a fatigue test, the elasticity attenuation is less than 5%, and 8N pressing force is generated to complete mechanical locking; triple protection of electrophoretic paint (20 microns), chromium plating (15 microns) and anodic oxidation (15 microns) passes a neutral salt spray test for 1000 hours; the N20 magnetic steel enables the vibration of the hand to be reduced to 0.8 m / s < 2 >; the diamond-shaped surface enables the holding force to be increased to 120 N (70 N compared with a smooth surface).

Description

TECHNICAL FIELD

[0001] The utility model relates to gun drill brush washing structure technical field, especially a disc flat brush quick connecting rod structure for handheld gun drill. BACKGROUND

[0002] The quick connecting rod for handheld gun drill in the traditional market mainly has the following technical pain points: low dismounting efficiency: the traditional threaded connection mode needs to be rotated for many circles to fasten, and the operation is complicated and time-consuming (usually more than 30 seconds are needed), which seriously affects the working efficiency in the operation scene where tools need to be frequently replaced.

[0003] Poor connection reliability: although the pure magnetic quick connection structure (such as CN110625487A) is fast to dismount, it only relies on magnetic force fixation, and is easy to loosen under vibration working conditions, and the axial tensile strength is generally lower than 50N.

[0004] Insufficient positioning accuracy: the existing quick connection structure is easy to produce cumulative error after being dismounted for many times, so that the radial runout of the tool after installation exceeds 0.15mm, which affects the machining quality.

[0005] Short service life: the threaded connection part is easy to wear, and usually appears loose after 50,000 times of plugging and unplugging; the magnet steel of the magnetic attraction type structure is easy to oxidize and fail in a humid environment.

[0006] Poor man-machine efficiency: the traditional structure needs to be operated by both hands and has residual torque, and the tool is easy to suddenly fall off during dismounting, causing safety hazards.

[0007] A kind of electromagnetic quick-change connector for manipulator is disclosed in Chinese patent (publication number: CN 208557555U), which includes a main body and a clamp, the bottom of the main body is provided with a first recess, the first recess is provided with a first permanent magnet, the top of the clamp is provided with a second recess, the second recess is provided with a second permanent magnet, and the outer sides of the main body and the clamp are provided with a power box with a power cord, but this quick-change connector single magnetic attraction fixation: only neodymium iron boron magnet adsorption, no mechanical locking mechanism, under the vibration working condition of gun drill, the risk of falling off is high;Adopt magnetic attraction docking without guiding positioning structure, therefore a disc flat brush quick connecting rod structure for handheld gun drill is needed. UTILITY MODEL CONTENTS

[0008] The utility model aims at solving the shortcomings that the quick-change connector in the prior art has single magnetic attraction fixation: only neodymium iron boron magnet adsorption, no mechanical locking mechanism, and the risk of falling off is high under the vibration working condition of gun drill;Adopt magnetic attraction docking without guiding positioning structure, and proposes a disc flat brush quick connecting rod structure for handheld gun drill.

[0009] The utility model discloses a technical scheme that solves its technical problem is adopted: a kind of disc flat brush quick connecting rod structure for handheld gun drill of the utility model, including main body rod piece, it is characterized by: the main body rod piece diameter is 150±2mm, the main body rod piece includes hexagonal rod, the hexagonal rod one end is connected with main body sleeve, the main body sleeve one end is connected with sliding sleeve, steel wire is equipped in the inside one side of sliding sleeve, the steel wire one side is equipped with elastic limiting mechanism, the inside one side of sliding sleeve is equipped with magnetic sleeve, magnetic steel is equipped in the inside of magnetic sleeve.Fast disassembly and assembly: steel wire elastic limit and magnetic double locking, tool replacement time is shortened to 3 seconds;High concentricity: 150mm diameter main body rod piece cooperates hexagonal transmission, radial runout ≤0.05mm (actual measurement);Anti-torsional vibration design: magnetic steel reduces high-frequency vibration, tool life is improved by more than 2 times (compared with no magnetic structure)。

[0010] Preferably, the sliding sleeve is made of aluminum alloy material and has cross diamond patterns on the surface, with a pitch of 1mm and a pattern depth of 0.3mm, and the surface has an anodized treatment layer with a thickness of 15±5μm.The diamond patterns increase the holding friction by 60% (ASTM D1894 standard test);The anodized layer has a hardness of HV800 or above and can withstand 100,000 times of plugging and unplugging abrasion;The aluminum alloy is 40% lighter than the traditional steel sliding sleeve, and the operation fatigue is reduced.

[0011] Preferably, the steel wire is made of 65Mn steel, the magnetic sleeve is made of 35 carbon steel, the magnetic steel is made of N20 steel, the main body sleeve is made of A3 steel and has a chrome plating treatment on the surface, and the hexagonal rod is made of 45# steel and has an electrophoretic paint treatment on the surface.The 35 steel magnetic sleeve and N20 magnetic steel combination has a magnetic induction intensity of 0.8T (measured by gauss meter);The chrome-plated sleeve and electrophoretic paint hexagonal rod pass the 48h salt spray test without rust;The material cost is reduced by 35% compared with the all-stainless steel solution.

[0012] Preferably, the hexagonal rod has an internal hexagonal hole at one end with a size of 6.35(+0.15mm / +0.03mm), and an external hexagonal end at the other end with a size of 6.35(0 / -0.15mm).The hexagonal rod matches the ISO 1173 standard gun drill interface, with an adaptation rate of 100% (tested on market mainstream models);The interference end ensures torque transmission without delay, and the clearance end facilitates quick alignment;The bidirectional tolerance band design improves the assembly success rate from 70% to 99%.

[0013] Preferably, the elastic limiting mechanism comprises an axially arranged snap ring and a pre-pressed spring group, the snap ring is quenched by 65Mn steel, the pre-pressed spring group is composed of three groups of 65Mn steel spiral springs, the spiral spring has a wire diameter of φ1.2mm, a pre-pressed stroke of 4±0.1mm, the snap ring and the pre-pressed spring group are provided with steel balls, and the steel balls have a diameter of 5mm.

[0014] Preferably, the magnetic sleeve and the main sleeve adopt a transition fit, the fitting tolerance is H7 / g6, the inner diameter of the magnetic sleeve is φ11.8±0.05mm, and the axial positioning accuracy is ≤0.03mm. The transition fit avoids demagnetization of the magnetic steel caused by press fitting (magnetic flux loss <3%); the inner diameter tolerance of φ11.8mm makes the magnetic force line uniformly distributed, and the suction fluctuation is ±2%; the magnetic sleeve can be manually disassembled and replaced (pull-out force ≤50N).

[0015] The utility model has the advantages that:

[0016] The application realizes rapid replacement through magnetic attraction pre-positioning + elastic secondary locking, the magnetic attraction guide automatically centers the tool hole; the 65Mn steel spring has a spring force attenuation of <5% after fatigue test and generates 8N compression force to complete mechanical locking; the three-protection of electrophoretic paint (20μm) + chrome plating (15μm) + anodic oxidation (15μm) passes through 1000h neutral salt spray test; the N20 magnetic steel reduces hand vibration to 0.8m / s 2 ; the diamond pattern surface improves the holding force to 120N (compared with 70N of a smooth surface); the A3 steel sleeve + 45# steel rod piece combination saves 40% of the cost compared with the full alloy scheme; the magnetic sleeve and the steel ball and other vulnerable parts can be manually replaced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0018] Fig. 1 It is a structural schematic diagram of the utility model.

[0019] Fig. 2 It is a structural schematic diagram of the utility model external hexagonal end.

[0020] Fig. 3 It is a structural schematic diagram of the utility model internal hexagonal hole.

[0021] In the diagram: 1. Main sleeve; 2. Hexagonal rod; 3. Sliding sleeve; 4. Snap ring; 5. Helical spring; 6. Magnetic sleeve; 7. Magnet; 8. Steel wire; 9. Steel ball; 10. External hexagonal end; 11. Internal hexagonal hole; 12. Main rod. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] Example

[0024] Please see Figs. 1-3 As shown, a quick-connect rod structure for a handheld gun drill with a disc-shaped flat brush includes a main rod 12. The main rod 12 has a diameter of 150±2mm and includes a hexagonal rod 2. One end of the hexagonal rod 2 is connected to a main sleeve 1, and the other end of the main sleeve 1 is connected to a sliding sleeve 3. A steel wire 8 is provided on one side of the sliding sleeve 3, and an elastic limiting mechanism is provided on one side of the steel wire 8. A magnetic sleeve 6 is provided on one side of the sliding sleeve 3, and a magnet 7 is provided inside the magnetic sleeve 6. Quick assembly and disassembly: The elastic limiting mechanism of the steel wire 8 and the magnetic attraction provide dual locking, reducing tool replacement time to within 3 seconds; High concentricity: The 150mm diameter main rod 12, combined with the hexagonal transmission, has a radial runout ≤0.05mm (measured); Anti-torsional vibration design: The magnet 7 reduces high-frequency vibration, increasing tool life by more than 2 times (compared to a structure without magnetic attraction).

[0025] In this embodiment, the sliding sleeve 3 is made of aluminum alloy and has a cross-shaped diamond pattern on its surface with a pitch of 1 mm and a pattern depth of 0.3 mm. The surface anodized layer has a thickness of 15 ± 5 μm. The diamond pattern increases the grip friction by 60% (ASTM D1894 standard test); the anodized layer has a hardness of HV800 or higher and can withstand 100,000 insertion and extraction wear cycles; the aluminum alloy sliding sleeve 3 is 40% lighter than the traditional steel sliding sleeve 3, reducing operational fatigue.

[0026] In this embodiment, the steel wire 8 is made of 65Mn steel, the magnetic sleeve 6 is made of No. 35 carbon steel, the magnet 7 is made of N20 steel, the main sleeve 1 is made of A3 steel with chrome plating, and the hexagonal rod 2 is made of No. 45 steel with electrophoretic paint treatment. The combination of the No. 35 steel magnetic sleeve 6 and the N20 magnet 7 achieves a magnetic induction intensity of 0.8T (measured with a gaussmeter); the chrome-plated sleeve and the electrophoretic paint hexagonal rod 2 showed no rust after a 48-hour salt spray test; and the material cost is 35% lower than that of the all-stainless steel solution.

[0027] In this embodiment, one end of the hexagonal rod 2 has an internal hexagonal hole 11 with a size of 6.35 (+0.15mm / +0.03mm); the other end has an external hexagonal end 10 with a size of 6.35 (0 / -0.15mm). It matches the ISO 1173 standard gun drill interface, achieving 100% compatibility (tested with mainstream market models); the interference fit ensures zero-delay torque transmission, while the clearance fit facilitates rapid alignment; the bidirectional tolerance zone design increases the assembly success rate from 70% to 99%.

[0028] In this embodiment, the elastic limiting mechanism includes an axially arranged retaining ring 4 and a preload spring assembly. The retaining ring 4 is made of 65Mn steel with a hardened finish. The preload spring assembly consists of three sets of 65Mn steel helical springs 5, each with a wire diameter of φ1.2mm and a preload stroke of 4±0.1mm. The retaining ring 4 and the preload spring assembly share a steel ball 9 with a diameter of 5mm. The 4mm preload stroke provides a constant clamping force of 8N, with an axial displacement ≤0.1mm. The parallel design of the three springs can withstand high-frequency impacts of 50 times / minute. The rolling structure of the steel ball 9 prevents dust accumulation (compared to traditional slider structures).

[0029] In this embodiment, the magnetic sleeve 6 and the main sleeve 1 adopt a transition fit with a tolerance of H7 / g6. The inner diameter of the magnetic sleeve 6 is φ11.8±0.05mm, and the axial positioning accuracy is ≤0.03mm. The transition fit avoids demagnetization of the magnet 7 caused by press fitting (magnetic flux loss <3%); the φ11.8mm inner diameter tolerance ensures uniform distribution of magnetic lines of force, with attraction fluctuation of ±2%; the magnetic sleeve 6 can be replaced by hand (pull-out force ≤50N).

[0030] The implementation principle of this embodiment is as follows:

[0031] Locking phase:

[0032] The tool's internal hexagonal hole 11 (6.35+0.15 / +0.03mm) first forms a clearance fit with the external hexagonal end 10 (6.350 / -0.15mm) of the hexagonal rod 2, and continues to advance so that the steel ball 9 (φ5mm) contacts the tool's slot slope, forcing the 65Mn steel preloaded spring assembly (3×φ1.2mm helical springs 5) to compress;

[0033] When the spring compression reaches the design stroke of 4±0.1mm: the steel ball 9 is fully inserted into the locking position of the slot, the 65Mn steel hardened retaining ring 4 (HRC50-55) provides radial constraint, and the spring preload is converted into an 8N axial locking force.

[0034] Job retention phase:

[0035] When the gun drill is running, the elastic limiting mechanism forms a dynamic balance. The spring stiffness coefficient K = 2N / mm can absorb axial impact. The steel balls 9 and the retaining ring 4 are evenly distributed at 120° on the contact surface to resist radial off-center load. The auxiliary adsorption force (80N) of the magnetic sleeve 6 (35# steel) and the magnet 7 (N20) shares the main axial load. The rigid connection between the hexagonal rod 2 (45# steel) and the main sleeve 1 (A3 steel chrome plated) ensures torque transmission.

[0036] Unlocking Phase:

[0037] When the sliding sleeve 3 is subjected to an axial tension of >6mm: the linkage mechanism of the steel wire 8 (65Mn steel) transmits the tension to the elastic limit component, the spring group is further compressed to the limit stroke (4.5mm), the steel ball 9 is disengaged from the slot, the magnetic attraction is mechanically released, and the tool is separated under its own weight (<50N).

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A quick-connect rod structure for a handheld gun drill with a disc-shaped flat brush, comprising a main rod (12), characterized in that: The main rod (12) has a diameter of 150±2mm. The main rod (12) includes a hexagonal rod (2). One end of the hexagonal rod (2) is connected to a main sleeve (1). One end of the main sleeve (1) is connected to a sliding sleeve (3). A steel wire (8) is provided on one side inside the sliding sleeve (3). An elastic limiting mechanism is provided on one side of the steel wire (8). A magnetic sleeve (6) is provided on one side inside the sliding sleeve (3). A magnet (7) is provided inside the magnetic sleeve (6).

2. The quick-connect rod structure for a handheld gun drill with a disc-shaped flat brush according to claim 1, characterized in that: The sliding sleeve (3) is made of aluminum alloy and has a cross diamond pattern on its surface with a pitch of 1 mm, a pattern depth of 0.3 mm, and a surface anodized layer thickness of 15 ± 5 μm.

3. The quick-connect rod structure for a handheld gun drill with a disc-shaped flat brush according to claim 1, characterized in that: The steel wire (8) is made of 65Mn steel, the magnetic sleeve (6) is made of No. 35 carbon steel, the magnet (7) is made of N20 steel, the main sleeve (1) is made of A3 steel and has a chrome-plated surface, and the hexagonal rod (2) is made of No. 45 steel and has an electrophoretic paint treatment.

4. The quick-connect rod structure for a handheld gun drill with a disc-shaped flat brush according to claim 1, characterized in that: The hexagonal rod (2) has an internal hexagonal hole (11) at one end, with a size of 6.35 (+0.15mm / +0.03mm); and an external hexagonal end (10) at the other end, with a size of 6.35 (0 / -0.15mm).

5. The quick-connect rod structure for a handheld gun drill with a disc-shaped flat brush according to claim 1, characterized in that: The elastic limiting mechanism includes an axially arranged retaining ring (4) and a preload spring assembly. The retaining ring (4) is made of 65Mn steel and hardened. The preload spring assembly consists of three sets of 65Mn steel helical springs (5). The helical springs (5) have a wire diameter of φ1.2mm and a preload stroke of 4±0.1mm. The retaining ring (4) and the preload spring assembly are provided with steel balls (9) with a diameter of 5mm.

6. The quick-connect rod structure for a handheld gun drill with a disc brush as described in claim 1, characterized in that: The magnetic sleeve (6) and the main sleeve (1) adopt a transition fit with a fit tolerance of H7 / g6. The inner diameter of the magnetic sleeve (6) is φ11.8±0.05mm and the axial positioning accuracy is ≤0.03mm.

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