CN214519996U

CN214519996U - Quick clamping device and multifunctional tool machine adopting same

Info

Publication number: CN214519996U
Application number: CN202023248815.1U
Authority: CN
Inventors: 陆传洋; 张成龙
Original assignee: Nanjing Jiuchi Electromechanical Industry Co ltd
Current assignee: Nanjing Jiuchi Electromechanical Industry Co ltd
Priority date: 2020-10-15
Filing date: 2020-12-29
Publication date: 2021-10-29
Anticipated expiration: 2030-12-29
Also published as: CN112388576A; WO2022077899A1; CN112223220A

Abstract

The utility model relates to a quick clamping device of hand-held type electric tool's cutter belongs to electric tool technical field. The device comprises a vertical hollow output shaft and a pull rod with a supporting cone at the lower end; the middle part of the pull rod is provided with a chute which forms a vertical moving pair with a hinge pin, and the hinge pin is hinged to the upper parts of the left chuck and the right chuck which are oppositely arranged at the two sides of the pull rod; the inner sides of the lower ends of the left and right chucks are matched with the expanding cone; the upper ends of the left chuck and the right chuck are abutted against a small spring sleeved on the pull rod, the upper end of the small spring is abutted against a pressing device for pressing the pull rod, the pressing device is also abutted against the upper end of the large spring, and the lower end of the large spring is limited on the output shaft. The utility model has complete release and no clamping stagnation; in the tensioning process, the large spring jacks the pull rod and the small spring pushes the left chuck and the right chuck relatively, so that the expansion cone is tensioned strongly, and the cutter is clamped very reliably.

Description

Quick clamping device and multifunctional tool machine adopting same

Technical Field

The utility model relates to a quick clamping device of hand-held type electric tool's cutter still relates to the multi-functional machine tool who adopts the device simultaneously, belongs to electric tool technical field.

Background

The output shaft of the multifunctional machine tool swings around the axis thereof to drive the working head (comprising a straight saw blade, a circular saw blade, a triangular sanding disc and a shovel-type scraper) mounted at the shaft end to move therewith, so that various operations such as sawing, cutting, grinding, scraping and the like can be realized, the multifunctional machine tool is a commonly-used handheld electric tool, the typical structure of which is disclosed in the Chinese patent application No. 201380021580.6, the multifunctional machine tool is provided with a shell which extends along the longitudinal axis direction approximately, the shell is provided with a holding area which is arranged for being held and guided by a single hand of a user, the multifunctional machine tool comprises an electric drive unit and tool equipment which are approximately accommodated in the shell, and the tool equipment is approximately mechanically decoupled from the shell. The housing has a center of gravity which is arranged along the longitudinal axis in a section which extends from a geometric center of the housing to the rear side, as a function of the length of the housing.

To the applicant's knowledge, quick clamping devices for tools such as saw blades, grinding heads and the like are of critical importance for the performance of the multi-function machine tool, since various types or sizes of tools often need to be replaced as appropriate during use of the existing multi-function machine tool.

It has been found that chinese patent application No. 201480043554.8 discloses a manually guided tool machine having a tool receiving device that is movable, in particular oscillatable, about a drive shaft in order to hold a tool arrangement on the tool machine. The tool holder has at least one tensioning device, at least one holding device and at least one locking device. The retaining means can be moved from at least one first open position to at least one second closed position. Furthermore, the holding device can preferably be tensioned by the tensioning device in a closing direction from the first open position towards the second closed position. The locking device is movable between at least one first locking position and at least one second unlocking position. In this case, the movement of the holding device can be prevented by the locking device in at least one locking position. The force exerted on the locking device indirectly or directly by the tool device moves the locking device from a locked position to an unlocked position. Although the tool receiving device with tensioning, holding and locking functions in the technical scheme can quickly and simply install the tool in the tool machine, obviously, the manufacturing and assembling process is poor, and particularly the holding device is complex in geometric shape and high in processing difficulty.

In addition, chinese patent documents 201510120755.X and 201610221396.1 respectively disclose a quick-change structure of a multifunctional tool and a quick-change multifunctional saw structure capable of performing various operations such as cutting and sanding, and the technical solutions of the two patents both adopt an elastic chuck structure to realize quick clamping of a tool, so that after the tool is used, the elastic chuck is difficult to avoid fatigue damage due to repeated elastic deformation and recovery, and the service life is limited.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: aiming at the defects of the prior art, the quick clamping device for the cutter is simple in structure, good in manufacturing process and capable of avoiding fatigue damage, and the multifunctional machine tool adopting the quick clamping device is provided.

In order to achieve the above object, the utility model discloses quick clamping device of cutter's basic technical scheme is: the lifting device comprises a vertical hollow output shaft which is fixedly connected with an output shaft base and can swing and rotate, and a lifting pull rod positioned in the output shaft; the lower end of the pull rod is provided with a supporting expansion cone, the middle part of the pull rod is provided with a sliding chute which forms a vertical moving pair with a hinge pin, and the hinge pin is hinged to the upper parts of a left chuck and a right chuck which are arranged at two sides of the pull rod; the lower ends of the left chuck and the right chuck extend out of a central hole of the output shaft base, the inner sides of the lower ends of the left chuck and the right chuck are matched with the expanding cone, and the outer sides of the lower ends of the left chuck and the right chuck are matched with a mounting hole of a tool to be clamped;

the hold-down device has an upper limit and a lower limit position; when the pull rod is positioned at the lower limit position, the downward moving stroke of the pull rod is larger than that of the left chuck and the right chuck, so that the left chuck and the right chuck are in a release state that the lower ends of the left chuck and the right chuck are separated from the expansion cone; when the left chuck and the right chuck are in an upper limit position, the pull rod is elastically jacked, and then the left chuck and the right chuck are in a tensioning state that the lower ends are propped open by the propping cones.

Particularly, the upper ends of the left chuck and the right chuck are abutted against a small spring sleeved on the pull rod, the upper end of the small spring is abutted against a pressing device for pressing and holding the pull rod, the pressing device is also abutted against the upper end of a large spring, and the lower end of the large spring is limited on the output shaft; when the left chuck and the right chuck are in a tensioning state that the lower ends of the left chuck and the right chuck are propped open by the propping cones after the pull rod is jacked by the large spring with the elastic coefficient larger than that of the small spring.

The utility model realizes the quick assembly and disassembly of the cutter by utilizing the downward movement release and upward movement tensioning of the lower ends of the left chuck and the right chuck, the lower ends are flexibly opened and closed because the upper ends of the left chuck and the right chuck are hinged, and the chute structure of the pull rod realizes the over travel downward movement of the pull rod relative to the left chuck and the right chuck in the releasing process, so the releasing is complete and the clamping stagnation can not occur; in the tensioning process, the large spring jacks the pull rod and the small spring pushes the left chuck and the right chuck relatively, so that the expansion cone is tensioned strongly, and the cutter is clamped very reliably.

The multifunctional tool machine adopting the utility model comprises a shell with a motor arranged in the middle and a transmission case arranged in the front, wherein the motor is in transmission connection with an output shaft through a swing transmission mechanism, and the transmission case consists of a vertical part for supporting the output shaft and a horizontal part for arranging the motor and the transmission mechanism; the vertical part is provided with the quick tool clamping device.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of the multi-function machine tool of the present invention.

Fig. 2 is a schematic top view of the embodiment of fig. 1 in a tool locking state.

Fig. 3 is a schematic sectional structure view of B-B of fig. 2.

Fig. 4 is a schematic top view of the embodiment of fig. 1 with the tool released.

Fig. 5 is a schematic sectional structure view of B-B of fig. 4.

Fig. 6 is a perspective exploded view of a portion of the knife quick clamping assembly of fig. 1.

In the figure: the device comprises a screw 1, a swing handle 2, a retainer ring 3, a swing handle gland 4, a swing seat 5, a press block 6, a transmission case 7, a retainer ring 8, an upper bearing 9, an output shaft 10, a framework oil seal 12, a needle bearing 13, a nut 14, an elastic cushion 15, an upper gasket 16, a large spring 17, a small spring 18, a lower gasket 19, a pull rod 20, a hinge pin 21, a left chuck 22, a right chuck 23, a saw blade 24, a shifting fork 25, a spherical bearing 27, a bearing seat 31, a front bearing 32, an eccentric shaft 33, a motor stator assembly 34, a motor rotor assembly 35, a rear bracket 36 and a shell 39.

Detailed Description

Example one

The multi-function machine tool of the present embodiment is shown in fig. 1 to 6, and has a basic structure similar to that of the prior art: the rear end of the shell 39 is provided with a battery pack, the middle part is provided with a motor, the front part is provided with a transmission case 7, and the motor is in transmission connection with an output shaft through a swing transmission mechanism. The transmission box 7 is L-shaped and comprises a vertical part for supporting the output shaft 10 and the tool quick clamping device and a horizontal part for arranging the motor and the transmission mechanism, and the tubular vertical part supports the hollow output shaft 10 through an upper bearing 9 and a lower needle bearing 13. The swing transmission mechanism is composed of the output end of the motor rotor and the fork opening of the shifting fork 25 sleeved on the output shaft 10 through the spherical bearing 27 at the front end of the eccentric shaft 33.

The quick tool clamping device comprises the following specific components: comprises a vertical hollow output shaft 10 which is fixedly connected with an output shaft base 11 and can swing and rotate, and a lifting pull rod 20 which is positioned in the output shaft 10. The output shaft base 11 is tightly fitted at the lower end of the output shaft 10, and the lower surface thereof is provided with a circumferential positioning protrusion D which is matched with a saw blade 24 as a tool to be clamped.

The lower end of the pull rod 20 is provided with a supporting cone 20-1, and the middle part is provided with a chute 20-2 which forms a vertical moving pair with a hinge pin 21. A hinge pin 21 hinges upper portions of left and right chucks 22 and 23 opposite to both sides of the draw bar. The lower parts of the left chuck 22 and the right chuck 23 contract radially, so that the lower ends extend out of the central hole of the output shaft base 11 and form a lower limiting step surface T in the middle. The inner sides of the lower ends of the left chuck 22 and the right chuck 23 are matched with the expanding cone 20-1, and the outer sides are provided with a neck part matched with a mounting hole of the saw blade 24 and a stop brim Z.

The upper ends of the left chuck 22 and the right chuck 23 are abutted against the small spring 18 sleeved on the pull rod 20 through the lower gasket 19, and the upper end of the small spring 18 is abutted against the lower pressing device for pressing and holding the pull rod 20 through the upper gasket 16. The upper gasket 16 is sleeved on the expanding shoulder of the pull rod 20 and is fixedly connected with the pull rod 20 through a nut 14 and an elastic pad 15 which are screwed on the upper end of the pull rod 20. The pressing device is also abutted against the upper end of the large spring 17 through the upper gasket 16, and the lower end of the large spring 17 is limited on the reducing step of the output shaft 10.

Specifically, the pressing device comprises a pressing block 6 which is sleeved on the flat section at the upper end of the pull rod 20 to form mutual circumferential constraint, an axial end face cam pair is formed by the upper end curved surface of the pressing block 6 and the lower end curved surface of the rotary seat 5, the outer circle at the upper section of the rotary seat 5 is in sliding fit with the upper through hole of the rotating handle pressing cover 4, and the expanding ring at the middle part is axially constrained on the lower end face of the upper through hole of the rotating handle pressing cover 4. The rotating handle gland 4 is tightly matched and arranged at the upper part of the vertical part of the transmission case 7. In addition, the excircle of the upper section of the rotating seat 5 is fixedly connected with the rotating handle 2 with two set angular limit positions through the fastening screw 1, so that the rotating handle 2 can drive the rotating seat 5 to rotate, and further, the pressing block 6 simultaneously axially presses the pull rod 20, the large spring 17 and the small spring 18 downwards through the upper gasket 16 which is reasonably arranged through the end face cam pair.

The two angular limit positions of the rotating handle 2 respectively correspond to the upper limit position and the lower limit position of the pressing device. When the rotary handle 2 is screwed to enable the pressing device to be located at the lower limit position through the end face cam pair, the pull rod 20, the left chuck 22 and the right chuck 23 are pressed downwards and move downwards simultaneously by overcoming the acting force of the large spring 17 and the small spring 18, and the lower limit step surface T in the middle of the left chuck 22 and the right chuck 23 is firstly limited by the upper end face of the output shaft base 11, so that the downward moving stroke of the pull rod 20 is larger than that of the left chuck and the right chuck, and the left chuck 22 and the right chuck 23 are located in the releasing state that the lower ends of the left chuck 22 and the right chuck are separated from the expansion cone 20-1 (see fig. 4 and 5); in this process, the constraint of the hinge pin 21 by the slide groove 20-2 ensures the stable downward movement of the left and

right chucks

22 and 23, and avoids the interference of the movement.

When the screwing rotary handle 2 returns to enable the end face cam pair to release downward pressure, the downward pressing device is located at an upper limit position under the resilience resetting action of the large spring and the small spring, and the pull rod 20 is jacked by the large spring 17 with the elastic coefficient larger than that of the small spring 18, so that the left chuck 22 and the right chuck 23 are located in a tensioning state that the lower end is propped by the propping cone 20-1 (see fig. 2 and 3); at this time, the small spring 18 still has a certain pressing effect on the left chuck 22 and the right chuck 23, and consequently, the small spring is complementary with the pulling effect of the pull rod 20, so that the matching and the opening of the expanding cone 20-1 are enhanced, and the stop ledge Z is added, so that the reliable installation of the saw blade 24 is ensured.

In addition to the above embodiments, the present invention may have other embodiments. For example, the pressing means may have another structure such as a rotary knob that rotates about a horizontal axis. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims

1. A rapid clamping device comprises a vertical hollow output shaft which is fixedly connected with an output shaft base and can swing, and a lifting pull rod which is positioned in the output shaft; the method is characterized in that: the lower end of the pull rod is provided with a supporting expansion cone, the middle part of the pull rod is provided with a sliding chute which forms a vertical moving pair with a hinge pin, and the hinge pin is hinged to the upper parts of a left chuck and a right chuck which are arranged at two sides of the pull rod; the lower ends of the left chuck and the right chuck extend out of a central hole of the output shaft base, the inner sides of the lower ends of the left chuck and the right chuck are matched with the expanding cone, and the outer sides of the lower ends of the left chuck and the right chuck are matched with a mounting hole of a tool to be clamped;

2. The quick clamping device of claim 1, wherein: the upper ends of the left chuck and the right chuck are abutted with a small spring sleeved on the pull rod, the upper end of the small spring is abutted with a pressing device for pressing and holding the pull rod, the pressing device is also abutted with the upper end of a large spring, and the lower end of the large spring is limited on the output shaft; when the left chuck and the right chuck are in a tensioning state that the lower ends of the left chuck and the right chuck are propped open by the propping cones after the pull rod is jacked by the large spring with the elastic coefficient larger than that of the small spring.

3. The quick clamping device of claim 2, wherein: the upper end of the left chuck and the upper end of the right chuck are abutted to the small spring sleeved on the pull rod through the lower gasket, and the upper end of the small spring is abutted to the pressing device through the upper gasket.

4. The quick clamping device of claim 3, wherein: the upper gasket is sleeved at the diameter-expanding shoulder of the pull rod and is fixedly connected with the pull rod through a fastener screwed at the upper end of the pull rod.

5. The quick clamping device of claim 4, wherein: the lower pressing device is abutted against the upper end of the large spring through the upper gasket, and the lower end of the large spring is limited on the diameter-reducing step of the output shaft.

6. The quick clamping device of claim 5, wherein: the pressing device comprises a pressing block which is sleeved at the upper end of the pull rod to form mutual circumferential constraint, and an axial end face cam pair is formed by the upper end curved surface of the pressing block and the lower end curved surface of the rotary seat.

7. The quick clamping device of claim 6, wherein: the excircle of the upper section of the rotating seat is in sliding fit with the upper through hole of the rotating handle gland, and the diameter expanding ring in the middle is axially constrained on the lower end surface of the upper through hole of the rotating handle gland; the rotating handle gland is tightly matched and arranged on the upper part of the vertical part of the transmission case; and the excircle of the upper section of the rotating seat is fixedly connected with the rotating handle through a fastener.

8. A multifunctional machine tool comprises a shell, wherein a motor is arranged in the middle of the shell, a transmission case is arranged at the front of the shell, the motor is in transmission connection with an output shaft through a swing transmission mechanism, and the transmission case consists of a vertical part for supporting the output shaft and a horizontal part for arranging the motor and the transmission mechanism; the method is characterized in that: the vertical portion is provided with a quick clamping device as claimed in any one of claims 1 to 7.