Quick-change connector structure for electric tool

Abstract

The utility model relates to a quick-change connector structure for an electric tool, which belongs to the technical field of connecting rod connecting mechanisms and comprises a cutter, the upper end of the cutter is provided with a quick-change connector component fixedly sleeved with the cutter in an embedded manner, and the cutter is internally provided with a centering drill bit fixedly sleeved with the quick-change connector component in an embedded manner. The quick-change connector assembly comprises a quick connecting rod, a stop pin column fixedly connected with the quick connecting rod in an inserted mode is arranged on the upper portion of the centering drill bit, a supporting block connected with the quick connecting rod in a sleeved mode is arranged at the upper end of the cutter, and a plurality of torque rods which are symmetrically distributed and fixedly connected with the cutter in an inserted and embedded mode are arranged on the supporting block. The device has the characteristics of compact structure, convenience in operation and disassembly and good running stability. The problems existing in threaded sleeving installation at present are solved. Quick replacement is achieved during tool replacement, and the machining precision and the working efficiency of materials are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting rod connection mechanisms, and particularly relates to a quick-change joint structure for power tools. Background Art

[0002] A quick-change joint is a connecting tooling between power tools such as electric drills and bench drills (for processing on materials such as wood, tiles, glass, stone, metal, etc.) and cutting tools (various reamers). With the continuous development of the power tool industry, the requirements for various processing materials and the rapid development of processing tools have continuously put forward new requirements for improving processing accuracy and efficiency.

[0003] In the existing assembly of the cutting tool and the joint body, it is installed through threads. At the same time, the torque during the rotary cutting of the cutting tool is realized by inserting two torque rods into the small holes on the end face of the large cutting tool for positioning and transmission. The torque rod is pushed by rotating the push rod nut. Therefore, during assembly, when the cutting tool is screwed to a certain position, it is necessary to check whether the small hole on the end face of the cutting tool is aligned with the small hole of the torque rod at the support end, and then rotate the push rod nut to push the torque rod into the end face hole of the cutting tool, and only then is the installation of the cutting tool completed. Here, there are two actions of screwing the threads twice, and there is also a problem that the end face of the cutting tool and the support end (due to the need for the assembly of two torque rods) will not be closely fitted (there must be a gap). At the same time, the installation of the drill bit in the middle is realized through a locking bolt, and tools are required for both installation and disassembly. When installing a small cutting tool, it is completely tightened on the main body with threads through tools.

[0004] Currently, the butt joint realizes the radial fixation of the cutting tool through threads, and at the same time uses threads for the axial positioning of the processing cutting tool. And during processing (for large cutting tools), there is no planar support for the perpendicularity of the cutting tool, and the swing of the processing cutting tool is rigidly supported by the matching accuracy of the threads, and the threads are used to bear the axial feeding force during processing. Currently, most butt joints have common problems such as poor concentricity and perpendicularity. Sometimes, various tools are needed to disassemble and install during replacement, which seriously affects the production efficiency of workers. Summary of the Invention

[0005] The utility model mainly solves the deficiencies existing in the prior art, and provides a quick-change joint structure for power tools, which has the characteristics of compact structure, convenient operation, quick disassembly and assembly, and good operation stability. It solves the problems existing in the current installation by means of threaded socketing. It realizes rapid replacement during tool replacement, and improves the processing accuracy of materials and work efficiency.

[0006] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0007] A quick-change joint structure for a power tool, including a tool bit. A quick-change joint assembly is provided at the upper end of the tool bit and is fixedly sleeved on the tool bit in an inserted manner. A centering drill bit fixedly inserted with the quick-change joint assembly is provided inside the tool bit. The quick-change joint assembly includes a quick-connect rod. A stop pin column fixedly inserted with the quick-connect rod is provided at the upper part of the centering drill bit. A support block sleeved on the quick-connect rod is provided at the upper end of the tool bit. A number of torque rods symmetrically distributed and fixedly inserted with the tool bit are provided on the support block.

[0008] Preferably, a movable sleeve sleeved on the quick-connect rod is provided at the upper end of the support block. A spring sleeved on the quick-connect rod is provided between the movable sleeve and the support block.

[0009] Preferably, snap rings nested with the quick-connect rod in a card slot manner are provided between the upper end of the movable sleeve, the support block and the quick-connect rod.

[0010] Preferably, a number of balls distributed in a ring shape and clamped with the centering drill bit are provided at the lower part of the quick-connect rod.

[0011] Preferably, the tool bit includes a small hole saw or a large hole saw.

[0012] Preferably, the small hole saw includes a bushing seat. A hole saw cutting head integrated with the bushing seat is provided at the lower end of the bushing seat. A number of insertion slots inserted with the torque rods are provided on the outer circle of the bushing seat.

[0013] Preferably, side holes communicating with the balls are provided in the insertion slots.

[0014] Preferably, an inner ring groove sleeved with the balls is provided on the inner wall of the bushing seat.

[0015] The utility model can achieve the following effects:

[0016] The utility model provides a quick-change joint structure for a power tool. Compared with the prior art, it has the characteristics of compact structure, convenient operation, quick disassembly and assembly, and good running stability. It solves the problems existing in the current installation by threaded socket connection. It realizes quick replacement when replacing the tool bit, and improves the processing accuracy and working efficiency of the material. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the utility model with a large tool bit.

[0018] Figure 2 It is a schematic structural diagram of the utility model with a small tool bit.

[0019] Figure 3 It is a sectional view of the structure of the utility model with a large tool bit.

[0020] Figure 4 This is a structural sectional view of the small tool of the present utility model.

[0021] Figure 5 This is a schematic structural view of the side-hole type small tool in the present utility model.

[0022] Figure 6 This is a schematic structural view of the inner-groove type small tool in the present utility model.

[0023] In the figure: quick-change joint assembly 1, tool 2, centering drill bit 3, small hole saw 4, large hole saw 5, quick-connect rod 6, snap ring 7, movable sleeve 8, stop pin column 9, spring 10, support block 11, torque rod 12, spherical ball 13, bushing seat 14, side hole 15, insertion slot 16, hole saw cutting head 17, inner ring groove 18. Specific embodiments

[0024] The technical solution of the present utility model will be further specifically described below through embodiments in conjunction with the drawings.

[0025] Embodiment 1: As Figures 1-5 shown, a quick-change joint structure for a power tool includes a tool 2, and the tool 2 includes a small hole saw 4 or a large hole saw 5. The small hole saw 4 includes a bushing seat 14, and a hole saw cutting head 17 integrated with the bushing seat 14 is provided at the lower end of the bushing seat 14. Four insertion slots 16 for inserting and connecting with the torque rod 12 are provided on the outer circle of the bushing seat 14. A side hole 15 communicating with the spherical ball 13 is provided in the insertion slot 16. A quick-change joint assembly 1 inserted and sleeved and fixed with the tool 2 is provided at the upper end of the tool 2, and a centering drill bit 3 inserted and fixed with the quick-change joint assembly 1 is provided inside the tool 2. The quick-change joint assembly 1 includes a quick-connect rod 6. A stop pin column 9 inserted and fixed with the quick-connect rod 6 is provided at the upper part of the centering drill bit 3. A plurality of spherical balls 13 distributed in a ring and clamped with the centering drill bit 3 are provided at the lower part of the quick-connect rod 6. A support block 11 sleeved with the quick-connect rod 6 is provided at the upper end of the tool 2, and four torque rods 12 distributed symmetrically and inserted and connected and fixed with the tool 2 are provided on the support block 11. A movable sleeve 8 sleeved with the quick-connect rod 6 is provided at the upper end of the support block 11, and a spring 10 sleeved with the quick-connect rod 6 is provided between the movable sleeve 8 and the support block 11. Snap rings 7 nested and connected with the quick-connect rod 6 in a card slot manner are provided between the upper end of the movable sleeve 8, the support block 11 and the quick-connect rod 6.

[0026] Embodiment 2: As Figures 1-4 and Figure 6As shown in the figure, a quick-change joint structure for a power tool includes a cutter 2, and the cutter 2 includes a hole saw 4 or a large hole saw 5. The hole saw 4 includes a bushing seat 14, and a hole saw cutting head 17 integrated with the bushing seat 14 is provided at the lower end of the bushing seat 14. Four insertion slots 16 for inserting and connecting with a torque rod 12 are provided on the outer circumference of the bushing seat 14, and an inner ring groove 18 for sleeving a spherical ball 13 is provided on the inner wall of the bushing seat 14. A quick-change joint assembly 1 is provided at the upper end of the cutter 2 and is inserted and fixedly sleeved with the cutter 2, and a centering drill bit 3 inserted and fixed with the quick-change joint assembly 1 is provided inside the cutter 2. The quick-change joint assembly 1 includes a quick-connect rod 6. A stop pin column 9 inserted and fixed with the quick-connect rod 6 is provided at the upper part of the centering drill bit 3, and a plurality of spherical balls 13 distributed in a ring and clamped with the centering drill bit 3 are provided at the lower part of the quick-connect rod 6. A support block 11 sleeved with the quick-connect rod 6 is provided at the upper end of the cutter 2, and four torque rods 12 symmetrically distributed and inserted and connected with the cutter 2 are provided on the support block 11. An activity sleeve 8 sleeved with the quick-connect rod 6 is provided at the upper end of the support block 11, and a spring 10 sleeved with the quick-connect rod 6 is provided between the activity sleeve 8 and the support block 11. Snap rings 7 nested and connected with the quick-connect rod 6 in a slot manner are provided between the upper end of the activity sleeve 8, the support block 11 and the quick-connect rod 6.

[0027] The design method of the quick-change joint structure includes the following operating steps: The first step: Improve the concentricity of machining accuracy; change the current thread positioning and fixing method. This structure adopts hole-shaft fit. The middle hole of the cutter 2 is no longer machined with threads and is directly a smooth hole. The threads on the quick-connect rod 6 are also removed and it is directly a smooth shaft, and it can be directly sleeved during installation. This greatly improves the concentricity requirement, and the machining accuracy requirements for the hole and shaft are also greatly simplified and easy to guarantee.

[0028] At the same time, because this structure uses hole-shaft fit for installation, the end face of the support block 11 and the end face of the cutter 2 are closely attached during machining, and the end face is used to bear the huge axial cutting force during machining. In this way, by adopting hole-shaft fit and end face support, the required machining accuracy requirements (concentricity, perpendicularity) are achieved, and at the same time, the machining force is more stable and reliable. The cutting is also more stable. Moreover, when the cutter is retracted after machining is completed, the cutter can be easily withdrawn. This structure adopts floating tool withdrawal.

[0029] When the tool is retracted after cutting is completed, this structure makes the cutter 2 floating in the axial direction, that is, there is a certain gap between the positioning end face and the positioning steel ball in the axial direction of the cutter 2 and it is movable. Therefore, when the cutter 2 is retracted, it is flexible, so that it is not easy to generate interference and jamming when the cutter is withdrawn, and the tool withdrawal is easier.

[0030] Step 2: Improve the installation efficiency. The quick-change joint structure adopts a hole-shaft fit and a movable steel ball automatic locking structure. Installation sequence: 1. Directly sleeve the tool 2 onto the central shaft and torque rod 12 at the front end of the quick-connect rod 6. 2. At this time, insert the centering drill bit 3 into the central hole at the front end of the quick-connect rod 6. When the centering drill bit 3 is inserted, the spherical ball 13 moves outward, allowing the tool 2 to move axially only with the designed clearance. As the centering drill bit 3 continues to be inserted, the movable sleeve 8 is pressed downwards, aligning the middle groove of the movable sleeve 8 with the stop pin 9. At this time, as the centering drill bit 3 continues to be inserted, the stop pin 9 moves radially. As the centering drill bit 3 is inserted, the stop pin 9 just aligns with the opening groove of the centering drill bit 3. Then release the movable sleeve 8. The movable sleeve 8 moves upwards under the action of the spring 10, locking the stop pin 9 to the centering drill bit 3, thereby fixing the centering drill bit 3. In this way, the installation uses the movable stop pin 9 or the spherical ball 13 to achieve quick positioning and fixing.

[0031] Step 3: Disassemble and replace the tool after processing: When disassembling and replacing the tool, just press down the movable sleeve 8 by a certain distance (align the stop pin 9 with the inner groove of the movable sleeve 8) and pull out the centering drill bit 3 to remove or replace the tool 2. In actual use, replacing the tool can basically be achieved within 3 seconds for disassembly and installation.

[0032] In summary, the quick-change joint structure for power tools has the characteristics of being structurally compact, easy to operate, quick to disassemble and assemble, and having good operating stability. It solves the problems existing in the current installation using threaded sleeves. It realizes quick replacement when replacing the tool, improving the processing accuracy and working efficiency of the material.

[0033] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the basic characteristics of the invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0034] In short, the above are only specific embodiments of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A quick-change connector structure for an electric tool, characterized in that: The invention comprises a tool (2), wherein the upper end of the tool (2) is provided with a quick-change joint assembly (1) which is plug-fitted and sleeved and fixed with the tool (2), and the tool (2) is provided with a centering drill bit (3) which is plug-fitted and fixed with the quick-change joint assembly (1); the quick-change joint assembly (1) comprises a quick-connect rod (6), the upper part of the centering drill bit (3) is provided with a stop pin column (9) which is plug-fitted and fixed with the quick-connect rod (6), the upper end of the tool (2) is provided with a support block (11) which is sleeved with the quick-connect rod (6), and the support block (11) is provided with a plurality of torque rods (12) which are symmetrically distributed and plug-fitted and fixed with the tool (2).

2. The quick-change connector structure for electric tools according to claim 1, characterized in that: The upper end of the support block (11) is provided with a movable sleeve (8) sleeved with the quick-connect rod (6), and a spring (10) sleeved with the quick-connect rod (6) is provided between the movable sleeve (8) and the support block (11).

3. The quick-change connector structure for electric tools according to claim 2, characterized in that: A snap ring (7) is provided between the upper end of the movable sleeve (8), the support block (11) and the quick-connect rod (6) and is connected and fixed to the quick-connect rod (6) in a slot-type nesting manner.

4. The quick-change connector structure for electric tools according to claim 1, characterized in that: The lower part of the quick-connect rod (6) is provided with a plurality of round balls (13) distributed in an annular shape and engaged with the centering drill bit (3).

5. The quick-change connector structure for electric tools according to claim 4, characterized in that: The tool (2) comprises a small hole saw (4) or a large hole saw (5).

6. The quick-change connector structure for electric tools according to claim 5, characterized in that: The small hole saw (4) comprises a shaft sleeve seat (14), the lower end of which is provided with a hole saw cutting head (17) which is integrated with the shaft sleeve seat (14), and the outer circle of the shaft sleeve seat (14) is provided with a plurality of plug-in grooves (16) which are plug-inly connected to the torque rod (12).

7. The quick-change connector structure for electric tools according to claim 6, characterized in that: The insertion groove (16) is provided with a side hole (15) which is in communication with the ball (13).

8. The quick-change connector structure for electric tools according to claim 6, characterized in that: The inner wall of the shaft sleeve seat (14) is provided with an inner ring groove (18) which is sleeved with the ball (13).

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