Quick-change structure and method for changing the needle of a handheld grinding and engraving machine

Abstract

The present invention relates to a quick-replacement structure for a turning needle of a handheld grinding and engraving machine and a replacement method thereof. The present invention improves the structure of a front shell cover and utilizes the specific structural matching and connection relationship among the front shell cover, a shell body, a multi-petal spring and a main shaft body to realize quick replacement of the turning needle. When the turning needle needs to be replaced, only a wrench is required to be connected with the first limiting part through a limiting groove. A limiting tool is connected with the second limiting part at the front end of the multi-petal spring, and the limiting tool is rotated to rotate the multi-petal spring so that the multi-petal spring loses its expansion fit with the turning needle. When replacing the turning needle, the multi-petal spring is rotated in the opposite direction by the limiting tool to make the turning needle and the multi-petal spring expand and fit, thereby completing the replacement of the turning needle.

Description

Technical Field

[0001] The invention relates to the technical field of electric tools, and in particular to a quick-changing structure for a turning needle of a handheld grinding and engraving machine and a changing method thereof. Background Art

[0002] The utility model patent with the authorization announcement number CN211073053U discloses a hand-held grinding and engraving machine that can prevent dust and drain water. In its structure, a three-petal spring (chuck) (refer to the appearance patent with the application number CN201930178130.8) is used to connect the needle, and the three-petal spring is connected to the front end of the spindle body through a thread. Since the stainless steel cap in the above utility model patent product closes the front end of the spindle body inside, in the above utility model patent product, a limit through hole needs to be set on the side of the shell, and a A corresponding through hole is set. When the needle needs to be replaced, it is necessary to insert a plug into the through hole to limit the spindle, and then use a wrench to rotate the three-petal spring to achieve the removal and installation of the needle. Although in the above-mentioned utility model patent, the through hole is blocked by a dust plug to prevent dust from entering, the dust plug needs to be disassembled and installed every time the needle is replaced. Firstly, the operation is cumbersome, and secondly, repeated disassembly and assembly of the dust plug will cause the dust plug to loosen or fall off and be lost. Therefore, during the operation, dust will enter the gap between the spindle and the housing through the through hole, thereby affecting the stability of the spindle.

[0003] Therefore, how to facilitate the replacement of the needle while preventing dust from entering the gap between the spindle and the housing and improving the stability of the spindle has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to facilitate the replacement of the turning needle and at the same time prevent dust from entering the gap between the main shaft and the housing, thereby improving the stability of the main shaft.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A quick-changing structure for a turning needle of a handheld grinding and engraving machine, comprising:

[0007] A main shaft body, wherein the front end of the main shaft body is provided with a first limiting portion for connecting a wrench, and the front end of the main shaft body is provided with a receiving cavity;

[0008] A multi-petal spring, the multi-petal spring is coaxially threaded into the accommodating cavity at the front end of the spindle body, the multi-petal ring is used to lock and connect the needle, and a second limiting portion is provided on the side of the front end of the multi-petal spring;

[0009] A housing, the housing being connected to the outside of the main shaft body through a bearing;

[0010] A front cover shell is detachably connected to the front end of the shell body so that the first limiting portion is located inside the front cover shell. A limiting groove is provided on the side of the front cover shell, and a through hole is provided in the middle of the limiting groove so that the first limiting portion at the front end of the main shaft body is located at the through hole, so that the wrench can be connected to the first limiting portion through the limiting groove.

[0011] Furthermore, in the above-mentioned quick-change structure for the needle of the handheld grinding and engraving machine, the bottom of the limiting groove is a plane, the first limiting portion is a plane, and the first limiting portion protrudes from the limiting groove or is flush with the bottom of the limiting groove.

[0012] Furthermore, in the above-mentioned quick-change structure for the turning needle of the handheld grinding and engraving machine, the multi-petal spring is specifically a three-petal spring.

[0013] Furthermore, in the above-mentioned quick-change structure for the turning needle of the handheld grinding and engraving machine, the front cover shell is screwed to the front end of the shell.

[0014] Furthermore, in the above-mentioned quick-change structure for the turning needle of the handheld grinding and engraving machine, the number of the limiting grooves is 2, and the 2 limiting grooves are symmetrically distributed on both sides of the front cover.

[0015] Furthermore, in the above-mentioned quick-change structure for the turning needle of the handheld grinding and engraving machine, the number of the first limiting parts is 4, and the 4 first limiting parts are distributed in a circular array on the side of the front end of the spindle body.

[0016] Furthermore, in the above-mentioned quick-change structure for the turning needle of the handheld grinding and engraving machine, the second limiting portion is a limiting structure for cooperating with the limiting function of the wrench.

[0017] Furthermore, in the above-mentioned quick-change structure for the turning needle of the handheld grinding and engraving machine, the through hole in the middle of the limiting groove is a rectangular through hole.

[0018] The present invention also relates to a method for replacing a turning needle quick-change structure of a handheld grinding and engraving machine, comprising the following steps:

[0019] A wrench is connected to the first limiting part through the limiting groove;

[0020] Connect the limiting tool to the second limiting part at the front end of the multi-petal spring, rotate the limiting tool to rotate the multi-petal spring so that the multi-petal spring loses its tight fit with the needle;

[0021] To replace the needle, use the limiting tool to reversely rotate the multi-petal spring so that the needle and the multi-petal spring are tightly fitted to complete the needle replacement.

[0022] In the above method, the limiting tool is a wrench.

[0023] The beneficial effects of the present invention are as follows: in the quick-change structure of the turning needle of the handheld grinding and engraving machine involved in the present invention, the structure of the front shell cover is improved, and the specific structural matching connection relationship between the front shell cover, the shell, the multi-petal spring and the main shaft body is utilized to realize the quick replacement of the turning needle; specifically, the front cover shell is detachably connected to the front end of the shell, so that the first limiting part is located inside the front cover shell, the side of the front cover shell is provided with a limiting groove, and the middle part of the limiting groove is provided with a through hole, so that the first limiting part at the front end of the main shaft body is located at the through hole, so that the wrench can be connected to the first limiting part through the limiting groove, and when the turning needle needs to be replaced, only one wrench is needed to be connected to the first limiting part through the limiting groove; the limiting The tool is connected to the second limiting part at the front end of the multi-petal spring, and the limiting tool is rotated to rotate the multi-petal spring so that it loses the tight fit with the needle. When replacing the needle, the multi-petal spring is rotated in the opposite direction by the limiting tool to make the needle and the multi-petal spring tight fit, and the needle can be replaced. Compared with the prior art, there is no need to set a limiting hole in the middle of the spindle body and set a through hole corresponding to the limiting hole on the side of the shell, and there is no need to limit the position by passing a bolt through the limiting hole, and no additional sealing plug is needed, so that the operation of replacing the needle is more convenient, and dust can be prevented from entering between the spindle body and the shell due to the loss of the sealing plug, thereby ensuring that the spindle can rotate smoothly, thereby improving the accuracy of grinding and engraving. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural explosion diagram of a handheld grinding and engraving machine according to a specific embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of a handheld grinding and engraving machine according to a specific embodiment of the present invention;

[0026] Figure 3 A sectional view of a handheld grinding and engraving machine in the specific embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of a front cover of a handheld grinding and engraving machine according to a specific embodiment of the present invention;

[0028] Figure 5 It is a structural schematic diagram of a multi-petal spring of a handheld grinding and engraving machine according to a specific embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the main shaft structure of a handheld grinding and engraving machine according to a specific embodiment of the present invention;

[0030] Figure 7 A schematic diagram of the housing structure of a handheld grinding and engraving machine according to a specific embodiment of the present invention;

[0031] Description of labels:

[0032] 1. Spindle body; 11. First limiting part; 12. Accommodating chamber; 2. Multi-petal spring; 21. Second limiting part; 3. Needle; 4. Housing; 5. Bearing; 6. Front cover; 61. Limiting groove; 62. Through hole; 7. Motor; 8. Transmission part. DETAILED DESCRIPTION

[0033] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0034] Example 1

[0035] Please refer to Figures 1 to 7 , a quick replacement structure of a turning needle 3 of a handheld grinding and engraving machine, comprising:

[0036] A main shaft body 1, wherein a first limiting portion 11 for connecting a wrench is provided at the front end of the main shaft body 1, and a receiving cavity 12 is provided at the front end of the main shaft body 1;

[0037] The multi-petal spring 2 is coaxially threaded in the accommodating cavity 12 at the front end of the spindle body 1. The multi-petal ring is used to lock and connect the needle 3. The side of the front end of the multi-petal spring 2 is provided with a second limiting portion 21. As an embodiment, the second limiting portion 21 is a limiting structure for cooperating with the wrench.

[0038] The multi-petal ring structure can refer to the appearance patent with application number CN201930178130.8, named chuck (engraved three-petal spring). In this appearance patent product, the chuck has three petals, and a multi-petal structure with more than three petals is also applicable. Preferably, the multi-petal spring 2 can adopt the three-petal spring structure of the above-mentioned appearance patent product.

[0039] A housing 4, wherein the housing 4 is connected to the outside of the main shaft body 1 through a bearing 5;

[0040] The front cover shell 6 is detachably connected to the front end of the shell 4. As an embodiment, the front cover shell 6 can be connected to the front end of the shell 4 by threads, so that the first limiting portion 11 is located inside the front cover shell 6. A limiting groove 61 is provided on the side of the front cover shell 6, and a through hole 62 is provided in the middle of the limiting groove 61, so that the first limiting portion 11 at the front end of the main shaft body is located at the through hole 62, so that the wrench can be connected to the first limiting portion 11 through the limiting groove 61, the bottom of the limiting groove 61 is a plane, the first limiting portion 11 is a plane, the first limiting portion 11 protrudes from the limiting groove 61 or is flush with the bottom of the limiting groove 61.

[0041] As an implementation manner, the number of the limiting grooves 61 is two, and the two limiting grooves 61 are symmetrically distributed on both sides of the front cover 6 .

[0042] As an implementation manner, the second limiting portion 21 is a limiting structure for cooperating with a wrench in limiting manner.

[0043] As an implementation manner, the second limiting portion 21 is a limiting structure for cooperating with a wrench in limiting manner.

[0044] The replacement method of the quick replacement structure of the turning needle 3 of the handheld grinding and engraving machine comprises the following steps:

[0045] A wrench is connected to the first limiting portion 11 through the limiting groove 61;

[0046] Connect the limiting tool to the second limiting part 21 at the front end of the multi-petal spring 2, and rotate the limiting tool to rotate the multi-petal spring 2 so that the multi-petal spring 2 loses its tight fit with the needle 3;

[0047] To replace the turning needle 3, the multi-petal spring 2 is rotated in the opposite direction by a limiting tool, so that the turning needle 3 and the multi-petal spring 2 are tightly matched, and the replacement of the turning needle 3 is completed. The limiting tool is a spanner.

[0048] Example 2

[0049] The quick replacement structure of the needle 3 of the handheld grinding and engraving machine described in Example 1, please refer to Figure 4 As a preferred solution, the through hole 62 in the middle of the limiting groove 61 is rectangular, and the first limiting portion 11 is flush with the bottom of the limiting groove 61. This structure can make it easier for the wrench to limit the first limiting portion 11, thereby making it easier to replace the needle 3.

[0050] Example 3

[0051] Reference Figures 1 to 3 A handheld grinding and engraving machine includes a quick-changing structure for a turning needle 3 of the handheld grinding and engraving machine in embodiment 1 or 2. The motor 7 is connected to the spindle body 1 through a transmission member 8, so that the spindle rotates in a shell 4, thereby driving the multi-petal spring 2 to rotate, and then driving the connected turning needle 3 to rotate. The transmission member 8 is connected to the spindle body 1 through a spring, and the outer ring of the bearing 5 connected to the spindle body 1 can slide with the inner wall of the shell 4 along its axial direction, so that the turning needle 3 can be axially extended and retracted during the rotation process.

[0052] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. The quick-change structure of the needle of the handheld grinding and engraving machine is characterized by: include: A main shaft body, wherein the front end of the main shaft body is provided with a first limiting portion for connecting a wrench, and the front end of the main shaft body is provided with a receiving cavity; A multi-petal spring, the multi-petal spring is coaxially threaded in the accommodating cavity at the front end of the spindle body, the multi-petal spring is used to lock and connect the needle, and a second limiting portion is provided on the side of the front end of the multi-petal spring; A housing, the housing being connected to the outside of the main shaft body through a bearing; A front cover shell, the front cover shell is detachably connected to the front end of the housing, so that the first limit portion is located inside the front cover shell, a limit groove is provided on the side of the front cover shell, and a through hole is provided in the middle of the limit groove, so that the first limit portion at the front end of the spindle body is located at the through hole, so that the wrench can be connected to the first limit portion through the limit groove; The bottom of the limiting groove is a plane, the first limiting portion is a plane, and the first limiting portion protrudes from the limiting groove or is flush with the bottom of the limiting groove; The second limiting portion is a limiting structure used to cooperate with the wrench in limiting position.

2. The quick-change structure for the turning needle of the handheld grinding and engraving machine according to claim 1 is characterized in that: The multi-petal spring is specifically a three-petal spring.

3. The quick-change structure for the turning needle of the handheld grinding and engraving machine according to claim 1 is characterized in that: The front cover is screwed to the front end of the shell.

4. The quick-change structure for the turning needle of the handheld grinding and engraving machine according to claim 1 is characterized in that: The number of the limiting grooves is 2, and the 2 limiting grooves are symmetrically distributed on both sides of the front cover.

5. The quick-change structure for the turning needle of the handheld grinding and engraving machine according to claim 1 is characterized in that: The number of the first limiting portions is four, and the four first limiting portions are distributed in a circular array on the side of the front end of the spindle body.

6. The method for replacing the turning needle quick replacement structure of the handheld grinding and engraving machine according to any one of claims 1 to 5, characterized in that: The following steps are involved: A wrench is connected to the first limiting part through the limiting groove; Connect the limiting tool to the second limiting part at the front end of the multi-petal spring, rotate the limiting tool to rotate the multi-petal spring so that the multi-petal spring loses its tight fit with the needle; To replace the needle, use the limiting tool to reversely rotate the multi-petal spring so that the needle and the multi-petal spring are tightly fitted to complete the needle replacement.

7. The method for replacing the turning needle quick replacement structure of the handheld grinding and engraving machine according to claim 6 is characterized in that: The limiting tool is a wrench.

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