CN216541198U

CN216541198U - Saw blade quick-change structure of electric tool

Info

Publication number: CN216541198U
Application number: CN202122815541.8U
Authority: CN
Inventors: 丰志明; 高金云
Original assignee: Zhejiang Jinmei Tools Co ltd
Current assignee: Zhejiang Jinmei Tools Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-05-17
Anticipated expiration: 2031-11-17

Abstract

The utility model relates to a saw blade quick-change structure of an electric tool, which comprises a locking mechanism, a head shell, a tool rest and a quick-change buckle, wherein the locking mechanism is arranged in the head shell and used for fixing or loosening a saw blade; the spring chuck is arranged below the movable rod, and the locking rod is clamped by the spring chuck. The locking block and the limiting sleeve are used for controlling the spring chuck to be opened and closed, the reset device is used for resetting the locking block, the spring chuck and the locking block are matched to assemble and disassemble the saw blade, the locking rod is taken out after the quick-change wrench buckle is rotated to assemble and disassemble the saw blade, the saw blade on the locking rod is replaced, then the locking rod is replaced, and the quick-change wrench buckle is rotated to fasten, so that the process is quick and simple.

Description

Saw blade quick-change structure of electric tool

Technical Field

The utility model relates to the technical field of machining equipment, in particular to a saw blade quick-changing structure and a saw blade quick-changing method of an electric tool.

Background

The multifunctional saw in the existing market is mostly fixedly installed by matching a pressing plate and an inner hexagon screw, and a blade is assembled and disassembled by a hexagon wrench, so that the multifunctional saw is labor-consuming and time-consuming in use. Some saw blade quick-change structures also exist in the market, and although time and labor can be saved, the saw blades are specially made, and all multifunctional saw blades cannot be installed.

Chinese patent CN105728846B discloses a quick-change multifunctional saw structure, the quick change device include that the quick change pulls to detain, eccentric block, movable rod, collet chuck, bloated tight pole, compression spring, the quick change is pulled to detain and the eccentric block passes through the cylindric lock and is connected with the head shell top, the movable rod is established in the output shaft, top and eccentric block are near being connected, bottom and bloated tight pole threaded connection, bloated tight pole outside cover has collet chuck, collet chuck outside cover has compression spring, the knife rest establish in the output shaft bottom, the knife rest inner wall is equipped with from the top down to the inside slope, the collet chuck's that corresponds surface is equipped with the lug with it, the quick-change multifunctional saw structure that this utility model relates to only need to pull the change that the diameter of collet chuck just can be realized through stirring the quick change knot to realize dismantling and change the mesh of saw bit. The utility model fixedly installs the saw blade by clamping the inner hole of the saw blade by the spring chuck, when the diameter of the inner hole of the saw blade is larger, the saw blade can not be installed or fixed after being installed; when the saw bit hole diameter is less, can't adorn collet chuck, this utility model can only install the saw bit that has the specific diameter hole, and the hole is greater than or is less than the saw bit of this specific diameter and can not assemble smoothly, uses to get up fairly to have the limitation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a saw blade quick-change structure of an electric tool, which aims to solve the problems that the saw blade replacement process is complicated, the existing quick-change head only supports installation of a specific saw blade and the like in the prior art.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows:

the utility model relates to a saw blade quick-change structure of an electric tool, which comprises a locking mechanism, a head shell, a tool rest and a quick-change buckle, wherein the locking mechanism is arranged in the head shell and used for fixing or loosening a saw blade; the section of the movable rod is inverted Y-shaped, a cavity for accommodating the spring chuck is arranged at the lower part of the movable rod, the upper part of the spring chuck is positioned in the cavity, the clamping part of the spring chuck faces downwards, the inner diameter of the middle part of the cavity is gradually reduced from top to bottom, the upper end surface of the spring chuck is not contacted with the top surface of the cavity, a locking head is arranged at the upper part of the locking rod, the maximum diameter of the locking head is larger than the diameter of the locking rod below the locking head, the locking head is positioned in the clamping part of the spring chuck, and the locking head is contacted with the clamping part of the spring chuck; the locking block is arranged below the movable rod, a through hole is formed in the middle of the locking block, the inner diameter of the upper portion of the locking block is large, the inner diameter of the lower portion of the locking block is small, an annular inclined surface is formed between the large inner diameter position of the upper portion of the locking block and the small inner diameter position of the lower portion of the locking block, the outer side of the clamping portion of the spring chuck is tightly contacted with the annular inclined surface, and the locking block is coaxial with the central axis of the movable rod; the limiting sleeve is sleeved outside the locking rod, the upper end of the limiting sleeve corresponds to the lower end of the clamping part of the spring chuck up and down, the upper end face of the limiting sleeve is not contacted with the spring chuck, and the lower end of the limiting sleeve is fixed; the reset spring is in contact with the locking block and is used for resetting the locking block.

Preferably, the reset spring is a cylindrical spring, the middle part of the lower end face of the locking block is provided with an annular step with a downward direction, the cylindrical spring is sleeved on the periphery of the annular step, and the upper end of the cylindrical spring is in contact with the periphery of the annular step on the locking block. The annular step realizes the positioning of the cylindrical spring, so that the cylindrical spring can stably move in the device.

Preferably, the quick-change buckle comprises a quick-change spanner buckle and an eccentric block, and the quick-change spanner buckle and the eccentric block are relatively fixedly installed; the eccentric block is hinged on the head shell, a large-diameter part and a small-diameter part are arranged on the eccentric block, and the small-diameter part is contacted with the upper end face of the movable rod. The rotating shaft of the eccentric block is fixed, and the movable rod can be pressed downwards or loosened by rotating the eccentric block to change the position of the large-diameter part or the small-diameter part.

Preferably, the device also comprises an output shaft and a shifting fork, wherein the output shaft is a hollow stepped shaft, the locking mechanism is arranged inside the output shaft, the output shaft is rotatably arranged inside the head shell, the output shaft and the head shell are connected through a bearing, and the tool rest is fixedly arranged at the lower end of the output shaft; the shifting fork is sleeved outside the output shaft. The output shaft is driven to rotate through the swing of the shifting fork, so that the saw blade is driven to rotate and swing.

Preferably, the locking lever comprises a lever body and a lever head, the locking head is positioned at the top end of the lever body, and the lever head is matched with the tool rest to fix the saw blade.

Preferably, the locking rod passes through the tool rest, a hole or a protrusion matched with the saw blade is arranged on the lower end face of the tool rest, the saw blade is sleeved on the locking rod and is positioned between the tool rest and the rod head, and the upper surface of the rod head is in close contact with the lower surface of the saw blade.

Preferably, the inner diameter of the lower part of the cavity at the lower end of the movable rod is the same as that of the upper hole of the locking block. The cavity under the inverted Y-shaped movable rod is matched with the interior of the locking block to form a space for releasing the clamping part of the spring chuck.

Preferably, the upper part of the output shaft is provided with a deep groove ball bearing, and the lower part of the output shaft is provided with a needle bearing; the upper part of the deep groove ball bearing is provided with a first snap spring, and the lower part of the deep groove ball bearing is provided with a second snap spring. The deep groove ball bearing and the needle bearing are arranged to reduce the friction force of rotation, and the clamp spring is arranged to prevent the bearing from moving axially.

The use method of the saw blade quick-change structure of the electric tool comprises the following steps:

s1, rotating the quick-change buckle to loosen the locking mechanism and taking the locking rod out of the head shell;

s2, taking down the saw blade sleeved on the locking rod and replacing with a new saw blade;

and S3, the locking rod is arranged in the head shell, and the quick-change buckle is rotated to enable the locking mechanism to fasten the saw blade.

Preferably:

the specific process of step S1 is as follows: taking a cylindrical pin as a rotating center, driving an eccentric block to rotate 180 degrees by using a quick-change wrench buckle, so that the eccentric block is changed from a small-diameter part to be abutted against a movable rod to a large-diameter part to be abutted against the movable rod, the movable rod is pressed downwards, the spring chuck and a locking block are driven to move downwards until the lower end of the spring chuck is contacted with the upper end of a limiting sleeve and cannot move downwards continuously, but the locking block continues to move downwards under the action of the movable rod, so that the spring chuck is positioned at the central position of the inner space of the movable rod and the locking block, the spring chuck is in a free loosening state at the moment, and the locking rod is taken out;

the specific process of step S2 is as follows: taking down the locking rod, taking down the original saw blade together and sleeving the saw blade on the locking rod, taking down the saw blade and sleeving a new saw blade on the locking rod;

the specific process of step S3 is as follows: insert from the hole of knife rest the check lock lever that will change the saw bit, make check lock lever's locking head card go into in the collet chuck, the check lock lever is tentatively fixed, then pull the quick change and detain and change initial condition back, become path portion butt movable rod by major diameter portion butt movable rod, cylindrical spring loosens and makes the latch segment rebound this moment, the latch segment drives collet chuck rebound, collet chuck drives the check lock head and shifts up and cause the pole head to press the saw bit on the knife rest, the maximum position that the check lock lever reached to shift up this moment and can not rebound again, the latch segment still receives the ascending power of cylindrical spring, so the inboard annular inclined plane of latch segment compresses the clamping part outside of collet chuck, make collet chuck inwards shrink fastening check lock lever, the quick replacement of saw bit has been accomplished.

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

1. according to the saw blade quick-change structure of the electric tool, the saw blade is assembled and disassembled through the matching of the spring chuck and the locking block, the locking rod is taken out after the quick-change wrench buckle is rotated to replace the saw blade on the locking rod when the saw blade is assembled and disassembled, then the locking rod is replaced, and the quick-change wrench buckle is rotated to fasten, so that the process is quick and simple.

2. The saw blade quick-change structure of the electric tool, which is disclosed by the utility model, has the advantages that the saw blade is pressed on the tool rest and fixed through the rod head below the locking rod, the diameter of the rod head is larger than the diameter of the inner hole of most of the saw blades on the market, and the diameter of the locking rod is smaller than the diameter of the inner hole of most of the saw blades on the market, so that the saw blade quick-change structure has larger flexibility, the saw blades of most specifications on the market can be installed, and a special saw blade is not required to be used. The utility model can also be used for mounting parts such as a scraper knife, a grinding wheel and the like.

Drawings

Fig. 1 is a schematic structural view of a clamping state of a saw blade quick-change structure of an electric tool according to the utility model;

FIG. 2 is a schematic view of a quick-change saw blade structure of a power tool according to the present invention in a relaxed state;

fig. 3 is an exploded view of a saw blade quick-change structure of the power tool according to the present invention.

Illustration of the drawings: 1. quickly replacing a wrench; 2. an eccentric block; 3. a first clamp spring; 4. a cylindrical pin; 5. a head shell; 6. a deep groove ball bearing; 7. a second clamp spring; 8. a shifting fork; 9. a needle bearing; 10. an output shaft; 11. a movable rod; 111. a cavity; 12. a collet chuck; 13. a locking block; 131. an annular bevel; 14. a cylindrical spring; 15. a limiting sleeve; 16. a tool holder; 17. a seal ring; 18. a locking lever; 181. a rod body; 182 a locking head; 183 club head; 19. a saw blade.

Detailed Description

For further understanding of the present invention, the present invention will be described in detail with reference to examples, which are provided for illustration of the present invention but are not intended to limit the scope of the present invention.

Referring to fig. 1 and 3, the utility model relates to a saw blade quick-change structure of an electric tool, which comprises a locking mechanism, a head shell 5, a tool rest 16 and a quick-change buckle, wherein the locking mechanism is installed inside the head shell 5 and used for fixing or loosening a saw blade 16, the tool rest 16 is installed at the bottom of the head shell 5, the quick-change buckle is hinged on the head shell 5 and used for controlling the locking or loosening of the locking mechanism, and the locking mechanism comprises a movable rod 11, a locking rod 18, a spring chuck 12, a locking block 13, a limiting sleeve 15 and a return spring; the section of the movable rod 11 is inverted Y-shaped, the lower part of the movable rod 11 is provided with a cavity 111 for accommodating the collet chuck 12, the upper part of the collet chuck 12 is positioned in the cavity 111, the clamping part of the collet chuck 12 faces downwards, the inner diameter of the middle part of the cavity 111 is gradually reduced from top to bottom, the upper end surface of the collet chuck 12 is not contacted with the top surface of the cavity 111, the upper part of the locking rod 18 is provided with a locking head 182, the maximum diameter of the locking head 182 is greater than the diameter of the locking rod 18 below the locking head 182, the locking head 182 is positioned in the clamping part of the collet chuck 12, and the locking head 182 is contacted with the clamping part of the collet chuck 12; the locking block 13 is arranged below the movable rod 11, a through hole is formed in the middle of the locking block 13, the inner diameter of the upper portion of the locking block 13 is large, the inner diameter of the lower portion of the locking block 13 is small, an annular inclined surface 131 is formed between the large inner diameter of the upper portion of the locking block 13 and the small inner diameter of the lower portion of the locking block, the outer side of the clamping portion of the collet 12 is tightly contacted with the annular inclined surface 131, and the locking block 13 is coaxial with the central axis of the movable rod 11; the limiting sleeve 15 is sleeved outside the locking rod 18, the upper end of the limiting sleeve 15 corresponds to the lower end of the clamping part of the collet chuck 12 up and down, the upper end face of the limiting sleeve 15 is not in contact with the collet chuck 12, and the lower end of the limiting sleeve 15 is fixed; the return spring is in contact with the locking block 13 for returning the locking block 13.

Referring to fig. 1 and 3, the return spring is a cylindrical spring 14, a downward annular step is disposed in the middle of the lower end surface of the locking block 13, the cylindrical spring 14 is sleeved around the annular step, and the upper end of the cylindrical spring 14 is in contact with the circumferential plane of the annular step on the locking block 13. The annular step enables the cylindrical spring 14 to be positioned so that the cylindrical spring 14 is stable in movement in the device. The quick-change buckle comprises a quick-change wrench buckle 1 and an eccentric block 2, and the quick-change wrench buckle 1 and the eccentric block 2 are relatively fixedly installed; the eccentric block 2 is hinged on the head shell 5, and the eccentric block 2 is provided with a large diameter part and a small diameter part which are contacted with the upper end surface of the movable rod 11. The rotation axis of the eccentric block 2 is fixed, and the movable rod 11 can be pressed or released downward by rotating the eccentric block to change the position of the large diameter part or the small diameter part. The device further comprises an output shaft 10 and a shifting fork 8, wherein the output shaft 10 is a hollow stepped shaft, a locking mechanism is installed inside the output shaft 10, the output shaft 10 is rotatably installed inside a head shell 5, the output shaft 10 and the head shell 5 are connected through a bearing, and a tool rest 16 is fixedly installed at the lower end of the output shaft 10; the shifting fork 8 is sleeved outside the output shaft 10. The output shaft 10 is driven to rotate by the swing of the shift fork 8, thereby driving the saw blade 19 to swing rotationally.

Referring to fig. 1 and 3, the locking rod 18 includes a rod body 181 and a rod head 183, the locking head 182 is located at the top end of the rod body 181, and the rod head 183 is used for fixing the saw blade 19 in cooperation with the tool holder 16. The locking rod 18 passes through the tool rest 16, a hole or a protrusion matched with the saw blade 19 is arranged on the lower end face of the tool rest 16, the saw blade 19 is sleeved on the locking rod 18 and is positioned between the tool rest 16 and the rod head 183, and the upper surface of the rod head 183 is in close contact with the lower surface of the saw blade 19. The inner diameter of the lower part of the cavity 111 at the lower end of the movable rod 11 is the same as that of the upper hole of the locking block 13. The cavity 11 under the inverted Y shape of the movable rod 11 is matched with the interior of the locking block 13 to form a space for releasing the clamping part of the collet chuck 12. The upper part of the output shaft 10 is provided with a deep groove ball bearing 6, and the lower part of the output shaft 10 is provided with a needle bearing 9; the upper part of the deep groove ball bearing 6 is provided with a first snap spring 3, and the lower part of the deep groove ball bearing 6 is provided with a second snap spring 7. The deep groove ball bearing 6 and the needle bearing 9 are provided to reduce the friction force of rotation, and the circlip is provided to prevent the bearing from moving axially.

s1, rotating the quick-change buckle to loosen the locking mechanism and taking the locking rod 18 out of the head shell 5;

referring to fig. 1, with a cylindrical pin 4 as a rotation center, a quick-change trigger 1 drives an eccentric block 2 to rotate by about 180 degrees, so that the eccentric block 2 is changed from a small-diameter portion to a large-diameter portion to abut against a movable rod 11, the movable rod 11 is pressed downward, and after driving a collet chuck 12 and a locking block 13 to move downward for a certain distance, the lower end of the collet chuck 12 is in contact with the upper end of a limiting sleeve 15 and cannot move downward continuously, but the locking block 13 continues to move downward under the action of the movable rod 11, so that the collet chuck 12 is located at the center position of the inner space of the movable rod 11 and the locking block 13, and at this time, the collet chuck 12 is in a free-release state as shown in fig. 2 (the saw blade in fig. 2 is removed), and a clamping portion of the collet chuck 12 can be opened freely, and the locking rod 18 is removed.

S2, taking down the saw blade sleeved on the locking rod 18 and replacing with a new saw blade;

after the locking lever 18 is removed, the original saw blade is removed and sleeved onto the locking lever 18, the saw blade is removed and a new saw blade is sleeved onto the locking lever 18.

S3, the locking rod 18 is installed in the head shell 5, and the quick-change buckle is rotated to enable the locking mechanism to fasten the saw blade.

The locking rod 18 with the replaced saw blade is inserted into the hole of the tool rest 16, the locking head 182 of the locking rod 18 is clamped into the collet chuck 12, the locking rod 18 is initially fixed, then the quick-change trigger 1 is rotated to the initial state, the large-diameter part is abutted against the movable rod 11 to be changed into the small-diameter part to be abutted against the movable rod 11, at the moment, the cylindrical spring 14 is loosened to enable the locking block 13 to move upwards, the locking block 13 drives the collet chuck 12 to move upwards, the collet chuck 12 drives the locking head 182 to move upwards to enable the rod head 183 to press the saw blade 19 on the tool rest 16, at the moment, the locking rod reaches the maximum position of moving upwards and cannot move upwards again, the locking block 13 still receives the upward force of the cylindrical spring 14, the annular inclined surface 131 on the inner side of the locking block 13 compresses the outer side of the clamping part of the collet chuck 12, the collet chuck 12 contracts inwards to fasten the locking rod 18, and the quick replacement of the saw blade 19 is completed.

The saw blade in this embodiment may be replaced with a blade or a grinding wheel.

In the embodiment, the saw blade is pressed on the cutter frame to be fixed through the rod head below the locking rod, the diameter of the rod head is larger than the diameter of the inner hole of most of the saw blades on the market, and the diameter of the locking rod is smaller than the diameter of the inner hole of most of the saw blades on the market, so that the saw blade fixing device has larger flexibility, can be used for installing most of specifications of saw blades on the market, and does not need to use special saw blades.

The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. The utility model provides an electric tool's saw bit quick change structure, its includes that locking mechanism, first shell, knife rest and quick change are detained, locking mechanism install and be used for fixing or relaxing the saw bit in first shell inside, the knife rest install in first shell bottom, quick change detain and articulate on first shell, the quick change is detained and is used for controlling locking mechanism's locking or relaxing its characterized in that: the locking mechanism comprises a movable rod, a locking rod, a spring chuck, a locking block, a limiting sleeve and a return spring; the section of the movable rod is inverted Y-shaped, a cavity for accommodating the spring chuck is arranged at the lower part of the movable rod, the upper part of the spring chuck is positioned in the cavity, the clamping part of the spring chuck faces downwards, the inner diameter of the middle part of the cavity is gradually reduced from top to bottom, the upper end surface of the spring chuck is not contacted with the top surface of the cavity, the upper part of the locking rod is provided with a locking head, the maximum diameter of the locking head is larger than the diameter of the locking rod below the locking head, the locking head is positioned in the clamping part of the spring chuck, and the locking head is contacted with the clamping part of the spring chuck; the locking block is arranged below the movable rod, a through hole is formed in the middle of the locking block, the inner diameter of the upper portion of the locking block is large, the inner diameter of the lower portion of the locking block is small, an annular inclined surface is formed between the large inner diameter position of the upper portion of the locking block and the small inner diameter position of the lower portion of the locking block, the outer side of the clamping portion of the spring chuck is tightly contacted with the annular inclined surface, and the locking block is coaxial with the central axis of the movable rod; the limiting sleeve is sleeved outside the locking rod, the upper end of the limiting sleeve corresponds to the lower end of the clamping part of the spring chuck up and down, the upper end surface of the limiting sleeve is not in contact with the spring chuck, and the lower end of the limiting sleeve is fixed; the reset spring is in contact with the locking block and is used for resetting the locking block.

2. The saw blade quick-change structure of the power tool as claimed in claim 1, wherein: the reset spring is a cylindrical spring, the middle part of the lower end face of the locking block is provided with an annular step with a downward direction, the cylindrical spring is sleeved on the periphery of the annular step, and the upper end of the cylindrical spring is in contact with the periphery of the annular step on the locking block.

3. The saw blade quick-change structure of the power tool as claimed in claim 1, wherein: the quick-change buckle comprises a quick-change spanner buckle and an eccentric block, and the quick-change spanner buckle and the eccentric block are relatively fixedly installed; the eccentric block is hinged on the head shell, a large-diameter part and a small-diameter part are arranged on the eccentric block, and the small-diameter part is contacted with the upper end face of the movable rod.

4. The saw blade quick-change structure of the power tool as claimed in claim 1, wherein: the locking mechanism is arranged in the output shaft, the output shaft is rotatably arranged in the head shell, the output shaft and the head shell are connected through a bearing, and the tool rest is fixedly arranged at the lower end of the output shaft; the shifting fork is sleeved outside the output shaft.

5. The saw blade quick-change structure of the power tool as claimed in claim 4, wherein: the locking rod comprises a rod body and a rod head, the locking head is positioned at the top end of the rod body, and the rod head is matched with the knife rest to fix the saw blade.

6. The saw blade quick-change structure of the power tool as claimed in claim 5, wherein: the locking rod passes through the tool rest, a hole or a bulge matched with the saw blade is arranged on the lower end face of the tool rest, the saw blade is sleeved on the locking rod and is positioned between the tool rest and the rod head, and the upper surface of the rod head is in close contact with the lower surface of the saw blade.

7. The saw blade quick-change structure of the power tool as claimed in claim 1, wherein: the inner diameter of the lower part of the cavity at the lower end of the movable rod is the same as that of the hole at the upper part of the locking block.

8. The saw blade quick-change structure of the electric tool as claimed in claim 4, wherein: the upper part of the output shaft is provided with a deep groove ball bearing, and the lower part of the output shaft is provided with a needle bearing; the upper part of the deep groove ball bearing is provided with a first snap spring, and the lower part of the deep groove ball bearing is provided with a second snap spring.