A quick insertion and ejection connecting device for saw blades

Abstract

The utility model relates to a kind of connecting device of quick insertion and ejection of saw blade in the field of curved saw, including output shaft, the one end of output shaft is provided with the installation component for connecting saw blade, installation component includes connecting shaft, sliding block, limit shaft sleeve and rotating handle, sliding block can reciprocate along the axial direction of connecting shaft, limit shaft sleeve is connected with containing cavity clamping, containing cavity is equipped with the elastic member that can apply rotating torsion to limit shaft sleeve, one end of elastic member is in contact with sliding block, so that elastic member can apply the elastic force of continuously approaching limit shaft sleeve to sliding block, sliding block is limited by clamping structure with limit shaft sleeve, the end portion of connecting shaft away from output shaft is set with the connecting groove for passing in saw blade, positioning structure for clamping saw blade is set on sliding block, the middle part of limit shaft sleeve is set with avoiding mouth, the connecting device of the utility model can realize the quick insertion installation and safe ejection disassembly of saw blade, improve the convenience of use and user experience.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of curve saw, concretely relates to a connecting device that saw blade fast insertion and ejection. BACKGROUND

[0002] As an important electric tool, the curve saw has a wide application, including but not limited to metal processing, wood cutting and non-metal material forming fields. It realizes efficient cutting of complex curves, straight lines or irregular shapes through reciprocating or orbital motion of the saw blade. With the development of lightweight, efficient and intelligent electric tools, the curve saw has increasingly improved requirements for the convenience of saw blade mounting and dismounting, the reliability of connection and the safety of operation.

[0003] The connecting device of the saw blade or the saw blade with the curve saw host is the core component to ensure cutting accuracy and operation efficiency. In the prior art, the saw blade connecting device is mostly clamped block type fastening or quick release mechanism. The basic function of these devices is to realize the transmission connection of the saw blade and the host through mechanical clamping or friction force, while considering the mounting and dismounting efficiency and connection stability.

[0004] However, the existing saw blade connecting device still has certain defects. Among them, the saw blade connection in the prior art is not easy to fast insert and install, which leads to time-consuming and laborious saw blade installation, and is difficult to meet the efficiency requirement in the high-frequency replacement scene, affecting the installation and use convenience and work efficiency, and the existing connecting device is not easy to quickly dismount and take out the saw blade. Usually, the locking mechanism needs to be manually operated in reverse and the saw blade needs to be manually taken down. The high temperature generated by friction during the cutting process of the saw blade easily leads to thermal expansion and adhesion between the saw blade and the connecting structure, increasing the difficulty of manual piece taking. At the same time, the friction and high temperature during the cutting process of the saw blade lead to the inconvenience of dismounting the saw blade taken by hand, and there is a risk of high temperature scalding, thereby affecting the convenience and experience of use. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the above defects, providing a connecting device that saw blade fast insertion and ejection, to solve the technical problems of how to improve the convenience and efficiency of saw blade installation and use in the above background technology, and how to make the saw blade quickly dismount and eject when it needs to be replaced, to improve the use experience.

[0006] The utility model is realized by the following way:

[0007] The utility model provides a kind of quick insertion and ejection of saw blade and the connecting device of pop-out, including output shaft, the one end of the output shaft is provided with the installation component for connecting saw blade, installation component includes connecting shaft, sliding block, limit shaft sleeve and rotating handle, rotating handle is equipped with the accommodating cavity for accommodating connecting shaft, sliding block and limit shaft sleeve, one end of connecting shaft extends outward through accommodating cavity and is coaxially connected with output shaft, the other end of connecting shaft is coaxially connected with sliding block, sliding block can reciprocate along the axial direction of connecting shaft, limit shaft sleeve is connected with accommodating cavity by clamping, and elastic member is provided in accommodating cavity and can apply rotating torsion to limit shaft sleeve, one end of elastic member is in contact with sliding block, so that elastic member can apply elastic force to sliding block to continuously approach limit shaft sleeve, sliding block is limited by clamping structure with limit shaft sleeve, and the end portion of connecting shaft away from output shaft is provided with connecting groove for passing saw blade, and the positioning structure for clamping saw blade is provided on sliding block, and the middle part of limit shaft sleeve is provided with avoiding mouth, and limit shaft sleeve is synchronously rotated by the rotation of rotating handle, so that avoiding mouth is communicated with connecting groove.

[0008] When saw blade is quickly inserted and matched through avoiding mouth and connecting groove, the end of saw blade is in contact with positioning structure and can apply extrusion force to sliding block, so that sliding block moves along the axial direction of connecting shaft and is separated from the clamping of limit shaft sleeve, and rotating handle drives limit shaft sleeve to rotate by the elastic torsion of elastic member, so that avoiding opening and connecting groove are misaligned and can clamp and lock saw blade.

[0009] When rotating handle drives limit shaft sleeve to rotate synchronously, the clamping structure of limit shaft sleeve is aligned with sliding block, avoiding mouth is communicated with connecting groove, sliding block is driven to reset by the elastic force of elastic member, sliding block is clamped with limit shaft sleeve, and the ejection elastic force of saw blade can be applied by sliding block.

[0010] Further in the above description, the connecting groove extends along the axial direction of connecting shaft, the outer side of connecting shaft is formed with mounting portion, the end of mounting portion is in contact with output shaft, the end of connecting shaft away from output shaft is formed with positioning end for passing sliding block, sliding hole is provided on sliding block and is communicated, and sliding hole is connected with positioning end and can move axially along positioning end.

[0011] Connecting groove extends along the axial direction of connecting shaft, which provides a clear axial insertion path for saw blade, so that saw blade can be quickly inserted along the axial direction;Sliding block is connected with positioning end by sliding hole and can move axially along positioning end, which provides installation sliding space for saw blade insertion.

[0012] When the saw blade is inserted to apply extrusion force to the sliding block, the elastic member is compressed, causing the sliding block to move along the connecting shaft towards the output shaft, at which time the sliding block is disengaged from the clamping and limiting of the limiting sleeve, allowing the rotating handle to rotate under the action of the elastic member, at which time the avoiding opening of the limiting sleeve is misaligned with the connecting groove, thereby clamping the saw blade through the limiting sleeve, solving the problem of time-consuming and laborious installation of the saw blade in the prior art, and improving the efficiency of quick insertion.

[0013] Further in the above description, the end of the positioning end is provided with a positioning part, the outer diameter of the positioning part is smaller than the outer diameter of the positioning end, a limiting hole matched with the positioning part is formed on the limiting sleeve, and the avoiding opening is formed on the inner side of the limiting hole, when the rotating handle drives the limiting sleeve to rotate, the limiting hole rotates along the outer diameter of the positioning part, allowing the avoiding opening to communicate with the connecting groove.

[0014] In the initial state, the limiting sleeve is clamped and limited by the clamping structure with the sliding block, at which time the avoiding opening and the connecting groove are in a communicating state, providing a channel for the insertion of the saw blade.

[0015] In the locked state (saw blade installed), the saw blade is inserted along the channel, the limiting sleeve rotates under the torsion of the elastic member, causing the rotating handle to rotate synchronously, and the avoiding opening is misaligned with the connecting groove, at which time the limiting sleeve can lock the saw blade to complete the installation of the saw blade.

[0016] In the unlocked state (saw blade removed), the rotating handle is manually rotated, the avoiding opening communicates with the connecting groove, at which time the sliding block is reset under the action of the elastic force of the elastic member, and the sliding block can apply an ejecting force to the saw blade, causing the saw blade to be ejected along the channel, solving the problem of difficulty in manually removing the saw blade due to the thermal expansion and adhesion of the saw blade and the connecting structure in the prior art, and reducing the difficulty of disassembly and the risk of burns.

[0017] Further in the above description, the positioning structure is composed of a positioning groove, which is arranged on the inner side of the sliding hole, allowing the saw blade to be clamped and matched with the positioning groove through the clamping lug.

[0018] The positioning groove is arranged on the inner side of the sliding hole and precisely clamped and matched with the clamping lug of the saw blade, ensuring stable fixation of the saw blade after insertion, and in the locked state, the limiting sleeve can clamp the clamping lug of the saw blade, improving the stability and safety after installation.

[0019] Further in the above description, the accommodating cavity is provided with a connecting part for matching installation of a limiting sleeve, the limiting sleeve is arranged in the accommodating cavity and matches the connecting part, the inner wall of the accommodating cavity is provided with a limiting groove, the outer side of the limiting sleeve is formed with a limiting protrusion matched with the limiting groove, and the inner side of the limiting sleeve is provided with a limiting cavity, the inner diameter of the limiting cavity is larger than the outer diameter of the sliding block, so that the sliding block can move along the axial direction of the connecting shaft to approach or move away from the bottom wall of the limiting cavity.

[0020] The connecting part of the accommodating cavity and the limiting sleeve are accurately matched and clamped through the limiting groove and the limiting protrusion, so that the limiting sleeve is stably installed and cannot axially move; the inner diameter of the limiting cavity is larger than the outer diameter of the sliding block, so that sufficient space is provided for the axial movement of the sliding block along the connecting shaft, the sliding block can smoothly approach or move away from the bottom wall of the limiting cavity, and the sliding displacement of the sliding block during quick insertion and the reset pushing function of the sliding block during ejection are realized.

[0021] Further in the above description, the outer side of the sliding block is provided with a first slot and a second slot, the opening of the second slot is larger than that of the first slot, the inner wall of the limiting cavity is formed with a first protrusion and a second protrusion respectively matched with the first slot and the second slot, the first protrusion and the second protrusion of the limiting sleeve can be aligned with the first slot and the second slot through the torsional reset action of the elastic member, the sliding block moves to the limiting cavity under the elastic reset of the elastic member and is clamped and matched with the limiting sleeve, when the saw blade extrudes the sliding block to move to the output shaft, the first protrusion is separated from the clamping of the first slot, and the second protrusion can rotate along the opening of the second slot.

[0022] The first slot and the second slot of the sliding block are accurately matched with the first protrusion and the second protrusion of the limiting cavity, the protrusions are aligned with the slots when the elastic member is reset, and the stable clamping of the sliding block and the limiting sleeve is realized; when the saw blade extrudes the sliding block to move to the output shaft, the first protrusion is separated from the first slot, and the second protrusion rotates along the opening of the second slot, the torsion of the elastic member drives the limiting sleeve to rotate, so that the avoiding opening is misaligned with the connecting groove to clamp the saw blade, when disassembling, the rotating handle aligns the protrusions with the slots, the elastic force of the elastic member drives the sliding block to reset and eject the saw blade, and the problems of difficult disassembly and risk of scalding caused by high temperature adhesion are solved.

[0023] Further in the above description, the outer side of the limiting sleeve is provided with a clamping position for clamping one end of the elastic member, the end of the output shaft butted with the connecting shaft is provided with a clamping opening for clamping the other end of the elastic member, and the elastic member is composed of a torsional spring.

[0024] The clamping position of the limiting sleeve and the clamping opening of the end of the output shaft clamp the two ends of the elastic member respectively, so that the elastic member is stably installed and cannot displace, and the sliding block is provided with continuous and reliable elastic force, so that the reliability of the displacement function of the sliding block during quick insertion and the reset pushing function of the sliding block during ejection is ensured.

[0025] Further in the above description, the limiting shaft sleeve is arranged in the accommodating cavity, and the accommodating cavity is clamped with a snap spring for limiting the limiting shaft sleeve.

[0026] The snap spring in the accommodating cavity axially limits the limiting shaft sleeve, prevents axial movement of the limiting shaft sleeve during use, and ensures stability and positioning accuracy of the limiting shaft sleeve during rotation.

[0027] Further in the above description, an outer side of the rotating handle is formed with a wrench part.

[0028] The wrench part formed on the outer side of the rotating handle facilitates user holding and application of rotating force, reduces operation difficulty of the rotating handle, and improves use convenience.

[0029] Further in the above description, the output shaft is in a hollow structure, and the end of the output shaft connected with the rotating handle is connected with a driving piece capable of driving the output shaft to reciprocate up and down.

[0030] The utility model discloses the beneficial effect that when saw blade needs fast insertion installation, only need the saw blade end portion passes through the avoiding mouth of limiting shaft sleeve and with the connecting groove of connecting shaft end portion fast insertion pairing, the saw blade end portion contacts and applies extrusion pressure to the positioning structure on the sliding block at this moment, and the sliding block moves along the axial movement of connecting shaft and separates the holding state with the limiting shaft sleeve, and the elastic torsion of elastic part drives the synchronous rotation of limiting shaft sleeve, makes the avoiding mouth and connecting groove misregistration, and the limiting shaft sleeve forms the holding locking of saw blade, utilizes the extrusion pressure of saw blade insertion and triggers automatic locking mechanism, simplifies the installation step, realizes the quick insertion installation of saw blade.

[0031] When the saw blade needs to be disassembled and ejected, rotating the rotating handle drives the synchronous rotation of the limiting shaft sleeve, aligns the holding structure of the limiting shaft sleeve and the sliding block, and makes the avoiding mouth of the limiting shaft sleeve and the connecting groove in communication, at this time, the elastic member applies the reset elastic force of the sliding block to the limiting shaft sleeve, drives the sliding block to reset and re-holds with the limiting shaft sleeve, and the sliding block applies the ejecting elastic force of the saw blade to the positioning structure in the resetting process, so that the saw blade is automatically separated from the connecting groove, solves the problem that the saw blade is difficult to be taken out manually due to cutting friction and high temperature, avoids the risk of scalding caused by direct contact of the high-temperature saw blade with the hand, realizes the quick and safe disassembly of the saw blade, and significantly improves the convenience and user experience. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the overall structure schematic diagram of the embodiment;

[0033] Figure 2 It is the locking state section view of the connecting device and the saw blade in the embodiment;

[0034] Figure 3 It is the overall explosion schematic diagram of the embodiment;

[0035] Figure 4 Structure schematic view of the mounting assembly for the embodiment;

[0036] Figure 5 Structure schematic view of the sliding block and the limiting sleeve for the embodiment;

[0037] Figure 6 Structure schematic view of the limiting sleeve for the embodiment;

[0038] Figure 7 Structure schematic view of the sliding block for the embodiment;

[0039] Figure 8 Structure schematic view of the connecting structure between the output shaft and the mounting assembly for the embodiment;

[0040] Figure 9 Structure schematic view of the initial state for the embodiment;

[0041] Figure 10 Structure schematic view of the locking state for the embodiment;

[0042] The reference signs in the drawings are as follows:

[0043] 100 - output shaft, 101 - bayonet;

[0044] 200 - connecting shaft, 201 - connecting groove, 202 - mounting portion, 203 - positioning end, 204 - positioning portion;

[0045] 300 - sliding block, 301 - sliding hole, 302 - first slot, 303 - second slot, 3031 - unlocking portion, 3032 - locking portion, 304 - positioning groove;

[0046] 400 - limiting sleeve, 401 - limiting hole, 402 - avoiding opening, 403 - limiting protrusion, 404 - limiting cavity, 405 - first protrusion, 406 - second protrusion, 407 - clamping position, 408 - rotating lifting portion;

[0047] 500 - rotating handle, 501 - accommodating cavity, 502 - connecting portion, 503 - limiting groove, 504 - wrench portion;

[0048] 600 - elastic member, 700 - clamping spring, 800 - saw blade, 801 - clamping ear portion, 900 - driving member. DETAILED DESCRIPTION

[0049] The utility model will be described in further detail below in combination with the drawings and the specific embodiments.

[0050] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following describes the solution in further detail with reference to the accompanying drawings and embodiments.

[0051] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this scheme and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0052] In this embodiment, refer to Figures 1-9 The present invention relates to a quick-connect and ejection connection device for a saw blade 800, comprising an output shaft 100. One end of the output shaft 100 is provided with a mounting assembly for connecting the saw blade 800. The mounting assembly includes a connecting shaft 200, a sliding block 300, a limiting sleeve 400, and a rotating handle 500. The rotating handle 500 has a receiving cavity 501 for accommodating the connecting shaft 200, the sliding block 300, and the limiting sleeve 400. One end of the connecting shaft 200 extends outward through the receiving cavity 501 and is coaxially connected to the output shaft 100. The other end of the connecting shaft 200 is coaxially connected to the sliding block 300, which can reciprocate along the axial direction of the connecting shaft 200. The limiting sleeve 400 engages with the receiving cavity 501. The connecting shaft 200 has a connecting groove 201 at the end away from the output shaft 100 for inserting a saw blade 800. The sliding block 300 has a positioning structure for holding the saw blade 800. The limiting sleeve 400 has an avoidance opening 402 in the middle. The limiting sleeve 400 can be connected by rotating the handle 500 to rotate synchronously, so that the avoidance opening 402 communicates with the connecting groove 201.

[0053] When the saw blade 800 passes through the clearance opening 402 and is quickly paired with the connecting groove 201, the end of the saw blade 800 contacts the positioning structure and can apply a squeezing force to the sliding block 300, causing the sliding block 300 to move along the axial direction of the connecting shaft 200 and disengage from the clamping of the limiting sleeve 400. The rotating handle 500 drives the limiting sleeve 400 to rotate through the elastic torque of the elastic element 600, causing the limiting opening to misalign with the connecting groove 201 and clamping and locking the saw blade 800.

[0054] When the rotating handle 500 drives the limiting sleeve 400 to rotate synchronously, the limiting sleeve 400 and the sliding block 300 are aligned in the clamping structure, the clearance opening 402 is connected to the connecting groove 201, and the sliding block 300 is reset by the elastic force of the elastic element 600. The sliding block 300 is clamped with the limiting sleeve 400, and the elastic force of the sliding block 300 can be applied to the saw blade 800.

[0055] The connecting groove 201 extends along the axial direction of the connecting shaft 200. A mounting part 202 is formed on the outer surface of the connecting shaft 200. The mounting part 202 contacts the end of the output shaft 100. A positioning end 203 for passing through the sliding block 300 is formed at the end of the connecting shaft 200 away from the output shaft 100. A through sliding hole 301 is provided on the sliding block 300. The sliding hole 301 is paired with the positioning end 203 and can move axially along the positioning end 203.

[0056] The connecting groove 201 extends along the axial direction of the connecting shaft 200, providing a clear axial insertion path for the saw blade 800, which facilitates the rapid insertion of the saw blade 800 along the axial direction; the sliding block 300 is paired with the positioning end 203 through the sliding hole 301 and can move axially along the positioning end 203, providing installation sliding space for the saw blade 800 when it is inserted.

[0057] Specifically, the outer side of the positioning end 203 is milled to form a positioning plane, and the inner wall of the sliding hole 301 is provided with a sliding plane that matches the positioning plane, so that the connection between the sliding block 300 and the positioning end 203 can only slide axially, avoiding radial rotation of the sliding block 300.

[0058] The end of the positioning end 203 is provided with a positioning part 204. The outer diameter of the positioning part 204 is smaller than the outer diameter of the positioning end 203. The limiting bushing 400 is provided with a limiting hole 401 that matches the positioning part 204. The clearance opening 402 is opened inside the limiting hole 401. When the rotating handle 500 drives the limiting bushing 400 to rotate, the limiting hole 401 rotates along the outer diameter of the positioning part 204, so that the clearance opening 402 can communicate with the connecting groove 201.

[0059] Specifically, the bottom wall of the limiting bushing 400 is provided with a lifting part 408 for matching the saw blade 800 lug 801.

[0060] The positioning structure consists of a positioning groove 304, which is located inside the sliding hole 301. This allows the saw blade 800 to be engaged and paired with the positioning groove 304 via the retaining lug 801. The positioning groove 304, located inside the sliding hole 301, precisely engages and pairs with the retaining lug 801 of the saw blade 800, ensuring stable fixation after insertion. Furthermore, in the locked state, the limiting sleeve 400 can hold the retaining lug 801 of the saw blade 800, improving stability and safety after installation.

[0061] Specifically, in this embodiment, there are two latches 801, and the two latches 801 are stacked together, so that the number and position of the positioning groove 304 are matched with the number and position of the latches 801.

[0062] The receiving cavity 501 is provided with a connecting part 502 for mating and installing the limiting bushing 400. The limiting bushing 400 passes through the receiving cavity 501 and is mated with the connecting part 502. The inner wall of the receiving cavity 501 is provided with a limiting groove 503. The outer side of the limiting bushing 400 is formed with a limiting protrusion 403 that is engaged with the limiting groove 503. The inside of the limiting bushing 400 is provided with a limiting cavity 404. The inner diameter of the limiting cavity 404 is larger than the outer diameter of the sliding block 300, so that the sliding block 300 can move along the axial direction of the connecting shaft 200 to approach or move away from the bottom wall of the limiting cavity 404.

[0063] The connecting part 502 of the receiving cavity 501 is precisely matched with the limiting bushing 400, and is held by the limiting groove 503 and the limiting protrusion 403 to ensure that the limiting bushing 400 is stably installed and does not move axially. The inner diameter of the limiting cavity 404 is larger than the outer diameter of the sliding block 300, providing sufficient space for the sliding block 300 to move axially along the connecting shaft 200, ensuring that the sliding block 300 can smoothly approach or move away from the bottom wall of the limiting cavity 404, realizing the sliding clearance function of the sliding block 300 during quick insertion and the reset pushing function of the sliding block 300 during ejection.

[0064] Specifically, in this embodiment, the limiting hole 401 passes through the limiting cavity 404 and communicates with the outside.

[0065] The outer side of the sliding block 300 is provided with a first groove 302 and a second groove 303. The opening of the second groove 303 is larger than that of the first groove 302. The inner wall of the limiting cavity 404 is formed with a first protrusion 405 and a second protrusion 406 for matching the first groove 302 and the second groove 303, respectively. Through the torsional reset action of the elastic member 600, the first protrusion 405 and the second protrusion 406 of the limiting bushing 400 can be aligned with the first groove 302 and the second groove 303, respectively. Under the elastic reset action of the elastic member 600, the sliding block 300 moves towards the limiting cavity 404 and is engaged with the limiting bushing 400. When the saw blade 800 presses the sliding block 300 to move towards the output shaft 100, the first protrusion 405 disengages from the first groove 302, and the second protrusion 406 can rotate along the opening of the second groove 303.

[0066] The first slot 302 and the second slot 303 of the sliding block 300 are precisely matched with the first protrusion 405 and the second protrusion 406 of the limiting cavity 404. When the elastic element 600 is reset, the protrusions are aligned with the slots, achieving stable holding of the sliding block 300 and the limiting sleeve 400. When the saw blade 800 presses the sliding block 300 to move towards the output shaft 100, the first protrusion 405 disengages from the first slot 302, and the second protrusion 406 rotates along the opening of the second slot 303. The torque of the elastic element 600 drives the limiting sleeve 400 to rotate, so that the clearance 402 and the connecting groove 201 are misaligned and hold the saw blade 800. When disassembling, the handle 500 is rotated to align the protrusions with the slots, and the elastic element 600 drives the sliding block 300 to reset and eject the saw blade 800. This solves the problem of difficult disassembly and risk of burns caused by high-temperature adhesion.

[0067] One side of the second groove is the initial unlocking part 3031, and the other side of the second groove is the locking part 3032. In the initial state, the second protrusion 406 moves along the second groove toward the initial unlocking part 3031. When the saw blade 800 is inserted, the torque of the elastic element 600 causes the limiting bushing 400 to move toward the locking part 3032.

[0068] The outer side of the limiting bushing 400 is provided with a locking position 407 for locking one end of the elastic member 600, and the end of the output shaft 100 that is connected to the connecting shaft 200 is provided with a locking slot 101 for locking the other end of the elastic member 600. The elastic member 600 is composed of a torsion spring.

[0069] The locking position 407 of the limiting bushing 400 and the locking slot 101 at the end of the output shaft 100 respectively hold the two ends of the elastic element 600, ensuring that the elastic element 600 is stably installed and does not shift, providing continuous and reliable elastic force for the sliding block 300, and ensuring the reliability of the sliding block 300's clearance function during quick insertion and the reset pushing function during ejection.

[0070] The limiting bushing 400 is built into the receiving cavity 501, and the receiving cavity 501 holds a retaining spring 700 for limiting the limiting bushing 400. The retaining spring 700 in the receiving cavity 501 axially limits the limiting bushing 400 to prevent axial movement during use and ensures the stability and positioning accuracy of the limiting bushing 400 when rotating.

[0071] The outer surface of the rotary handle 500 forms a wrench portion 504. The wrench portion 504 formed on the outer surface of the rotary handle 500 makes it easy for the user to grip and apply rotational force, reducing the difficulty of operating the rotary handle 500 and improving ease of use.

[0072] The output shaft 100 has a hollow interior, and the end of the rotating handle 500 of the output shaft 100 is connected to a drive component 900 that can drive it to move up and down reciprocally.

[0073] The specific insertion and removal process in this embodiment is as follows:

[0074] In the initial state of the connection device in this embodiment, refer to Figures 8-9 The limiting bushing 400 and the sliding block 300 are locked and limited by a locking structure. The first protrusion 405 is paired with the first groove for locking. The elastic force of the elastic element 600 drives the sliding block 300 to continuously lock and limit the limiting bushing 400. The second protrusion 406 contacts the unlocking part 3031 of the second groove. At this time, the clearance opening 402 and the connecting groove 201 are in a connected state, providing a channel for the insertion of the saw blade 800.

[0075] With the saw blade 800 in the locked position, refer to... Figures 5-10 The saw blade 800 is inserted along the channel. The sliding block 300 is subjected to the squeezing force of the saw blade 800. This squeezing force overcomes the elastic resistance of the elastic element 600, causing the elastic element 600 to undergo compression deformation. The first protrusion 405 disengages from the first groove. At this time, under the torque of the elastic element 600, the second protrusion 406 of the limiting bushing 400 rotates along the second groove toward the locking part 3032. The limiting bushing 400 can drive the rotating handle 500 to rotate synchronously. The clearance opening 402 is offset from the connecting groove 201. At this time, the saw blade 800 can be locked by the positioning groove 304 and the bottom wall of the limiting cavity 404 to complete the fixed installation of the saw blade 800.

[0076] With the saw blade in the unlocked state (disassembled saw blade 800), refer to... Figures 5-9 By manually rotating the handle 500, the opening is connected to the connecting groove 201. At this time, the retaining lug 801 of the saw blade 800 loses the limitation of the bottom wall of the limiting cavity 404. The sliding block 300 is reset under the elastic force of the elastic element 600. The sliding block 300 can apply a popping force to the saw blade 800, so that the saw blade 800 automatically pops out along the channel. This solves the problem of difficulty in manually removing the saw blade 800 due to the high temperature caused by cutting friction. At the same time, it avoids the risk of burns caused by the high temperature saw blade 800 directly contacting the hand. It realizes the quick and safe disassembly of the saw blade 800, which significantly improves the convenience of use and user experience.

[0077] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A quick-connect and ejection device for a saw blade, comprising an output shaft, characterized in that: One end of the output shaft is provided with an installation assembly for connecting a saw blade. The installation assembly includes a connecting shaft, a sliding block, a limiting sleeve, and a rotating handle. The rotating handle has a receiving cavity for accommodating the connecting shaft, the sliding block, and the limiting sleeve. One end of the connecting shaft extends outward through the receiving cavity and is coaxially connected to the output shaft. The other end of the connecting shaft is coaxially connected to the sliding block, which can reciprocate along the axial direction of the connecting shaft. The limiting sleeve is locked in place with the receiving cavity. The receiving cavity has an elastic element that can apply rotational torque to the limiting sleeve. One end of the elastic element contacts the sliding block, so that the elastic element can apply a continuous elastic force to the sliding block that approaches the limiting sleeve. The sliding block and the limiting sleeve are limited by the locking structure. The end of the connecting shaft away from the output shaft has a connecting groove for passing through the saw blade. The sliding block has a positioning structure for locking the saw blade. The limiting sleeve has a clearance opening in the middle. Rotating the rotating handle can drive the limiting sleeve to rotate synchronously, so that the clearance opening communicates with the connecting groove. When the saw blade passes through the clearance opening and is quickly paired with the connecting groove, the end of the saw blade contacts the positioning structure and can apply a squeezing force to the sliding block, causing the sliding block to move along the axial direction of the connecting shaft and disengage from the clamping of the limiting sleeve. The rotating handle drives the limiting sleeve to rotate through the elastic torque of the elastic element, causing the limiting opening to misalign with the connecting groove and clamping and locking the saw blade. When the rotating handle drives the limiting bushing to rotate synchronously, the limiting bushing and the sliding block's retaining structure are aligned, the clearance opening is connected to the connecting groove, and the sliding block is reset by the elastic force of the elastic element. The sliding block is retained by the limiting bushing, and the elastic force can be applied to the saw blade through the sliding block.

2. The saw blade quick-insertion and ejection connection device according to claim 1, characterized in that: The connecting groove extends along the axial direction of the connecting shaft. A mounting part is formed on the outer side of the connecting shaft. The mounting part contacts the end of the output shaft. A positioning end for a sliding block is formed at the end of the connecting shaft away from the output shaft. A through sliding hole is provided on the sliding block. The sliding hole is paired with the positioning end and can move axially along the positioning end.

3. The saw blade quick-insertion and ejection connection device according to claim 2, characterized in that: The end of the positioning end is provided with a positioning part, the outer diameter of the positioning part is smaller than the outer diameter of the positioning end, and the limiting bushing is provided with a limiting hole that matches the positioning part. The clearance opening is opened inside the limiting hole. When the rotating handle drives the limiting bushing to rotate, the limiting hole rotates along the outer diameter of the positioning part, so that the clearance opening can communicate with the connecting groove.

4. The saw blade quick-insertion and ejection connection device according to claim 2, characterized in that: The positioning structure consists of a positioning groove, which is located inside the sliding hole, allowing the saw blade to be engaged and paired with the positioning groove via the ear.

5. The saw blade quick-insertion and ejection connection device according to claim 1, characterized in that: The receiving cavity is provided with a connecting part for mating and installing a limiting bushing. The limiting bushing passes through the receiving cavity and mates with the connecting part. A limiting groove is formed on the inner wall of the receiving cavity. A limiting protrusion is formed on the outer side of the limiting bushing to engage with the limiting groove. A limiting cavity is provided inside the limiting bushing. The inner diameter of the limiting cavity is larger than the outer diameter of the sliding block, so that the sliding block can move along the axial direction of the connecting shaft to approach or move away from the bottom wall of the limiting cavity.

6. The saw blade quick-insertion and ejection connection device according to claim 5, characterized in that: The outer side of the sliding block is provided with a first groove and a second groove, the opening of the second groove being larger than that of the first groove. The inner wall of the limiting cavity is formed with a first protrusion and a second protrusion for matching the first groove and the second groove, respectively. Through the torsional reset action of the elastic element, the first protrusion and the second protrusion of the limiting sleeve can be aligned with the first groove and the second groove, respectively. Under the elastic reset action of the elastic element, the sliding block moves towards the limiting cavity and engages with the limiting sleeve. When the saw blade squeezes the sliding block to move towards the output shaft, the first protrusion disengages from the first groove, and the second protrusion can rotate along the opening of the second groove.

7. The saw blade quick-insertion and ejection connection device according to claim 1, characterized in that: The outer side of the limiting bushing is provided with a locking position for holding one end of the elastic element, and the end of the output shaft that connects with the connecting shaft is provided with a locking slot for holding the other end of the elastic element. The elastic element is composed of a torsion spring.

8. The saw blade quick-insertion and ejection connection device according to any one of claims 1-7, characterized in that: The limiting bushing is built into the receiving cavity, and the receiving cavity holds a retaining spring for limiting the limiting bushing.

9. The saw blade quick-insertion and ejection connection device according to any one of claims 1-7, characterized in that: The outer side of the rotary handle is formed for a wrench portion.

10. A saw blade quick-insertion and ejection connection device according to any one of claims 1-7, characterized in that: The output shaft has a hollow interior, and the end of the output shaft rotary handle is connected to a drive component that can drive it to move up and down reciprocatingly.

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