TWI750691B - Clamping device - Google Patents

Abstract

A clamping device includes a base, a driving unit, a moving piece and two sets of four-bar linkage mechanisms. The drive unit is installed in an accommodating space of the base, the moving member is movably disposed in the accommodating space, and each four-bar linkage has a first link pivotally connected to the base, a a second link pivotally connected to the base, a third link pivotally connected between the first link and the moving piece, and a third link pivotally connected between the first link and the second link the fourth link between. When the driving unit is activated and the moving member is driven to move, the fourth links can be linked to switch between an open state and a clamping state.

Description

Clamping device

The present invention relates to a clamping device, in particular to a clamping device applied to an automatic assembly machine.

An existing clamping device (publication number JP2015037827) includes a main body, a driving unit (pressure cylinder) mounted on the main body, a transmission member driven by the driving unit, two clamping arms pivotally connected to the main body, and Two springs which are connected to the support arms and provide restoring elastic force. The transfer member has two rollers, the gripping arms each have a cam member, and a gripping end opposite to the cam member.

When the driving unit is activated, the transmission member moves linearly relative to the main body, and the cam members of the clamping arms are driven by the rollers, and the clamping ends are converted from a mutually opposite open state to a In the clamping state approaching each other, when the rollers move out from the cam members of the clamping arms, the elastic force of the springs is used to make the clamping ends return to the open state.

Although this kind of clamping device can achieve the purpose of clamping objects, because there is no structural connection between the transmission member and the cam members, and the clamping arms are restrained by the transmission member, they use the The elastic force of the spring is restored by the clamping state In the open state, the noise generated during operation is relatively large, and the wear between the components will be serious, requiring frequent maintenance and replacement.

In addition, because the driving unit is located between the cam members of the clamping arms and the clamping ends, so that the clamping ends cannot be approached, the clamping device can only be applied to wider objects, and cannot be applied to Objects with a larger size range.

Therefore, the purpose of the present invention is to provide a clamping device which can reduce the working noise and has a larger clamping size range.

Therefore, the clamping device of the present invention includes a base, a driving unit, a moving part and two sets of four-bar linkage mechanisms. The base includes an accommodating space with an opening, the driving unit is installed in the accommodating space, and has an output portion corresponding to the opening and extending along an axis, the moving member is movably arranged in the accommodating space The four-link mechanism has a first link pivotally connected to the base and located at the side of the opening, and has a pivot portion pivotally connected to the The base is a second link located on one side of the first link, a third link pivotally connected between the first link and the moving piece, and a third link pivotally connected between the first link and the moving piece A fourth link between the second links, the first link has a first pivot portion pivotally connected to the base, and a first restrained end portion located on one side of the first pivot portion, and a first detent segment between the first detent end portion and the first pivot portion, the distance between the pivot portion of the moving member and the axis plus the length of the first detent segment greater than the distance between the first pivot part and the axis, the drive is activated When the moving unit drives the moving piece to move, the third link drives the first link to pivot relative to the base, and the first link drives the second link through the fourth link to rotate relative to the base. A pivot is generated on the base.

The effect of the present invention lies in that when the driving unit is activated and the moving member is driven to move by the overall cooperation, the fourth links can be connected to a clamp in an open state through the pivotal linkage of the four-link mechanisms. It can switch between holding states, and the working noise during operation is small, and the holding size range is large.

10: Pedestal

11: Accommodating space

111: Opening

20: Drive unit

21: Motor

22: Output Department

221: External thread part

30: Moving parts

31: screw holes

32: Axis pivot

40: Four-bar linkage

41: The first link

411: The first pivot part

412: The first restrained end

413: The first linkage end

414: The first link

415: The first switch section

42: Second Link

43: Third Link

44: Fourth Link

441: Linkage segment

442: Clamping segment

50: Stop block

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a three-dimensional combined view of an embodiment of the clamping device of the present invention; FIG. 2 is a three-dimensional view of the embodiment. exploded view; FIG. 3 is a schematic cross-sectional view of this embodiment; FIG. 4 is a partially enlarged schematic view of FIG. 3 , illustrating that the two fourth links are in an open state; and FIG. 5 is an operational schematic diagram of this embodiment, illustrating The fourth links are in a clamped state.

Referring to FIGS. 1 to 3 , an embodiment of the clamping device of the present invention includes a base 10 , a driving unit 20 , a moving member 30 , two sets of four-bar linkage mechanisms 40 and two anti-slip mechanisms Block 50.

The base 10 includes an accommodating space 11 having an opening 111 .

The driving unit 20 is installed in the accommodating space 11 and has a motor 21 and a power output portion 22 corresponding to the opening 111 that can output the power of the motor 21 . The output portion 22 extends along an axis L and is the output shaft of the motor 21 , and has an external thread portion 221 .

The moving member 30 has a screw hole 31 screwed to the external thread portion 221, and two pivot portions 32 disposed on both sides of the screw hole 31. The moving member 30 is driven by the driving unit 20 to move along the axis L It is movably arranged in the accommodating space 11 .

Each of the four-bar linkage mechanisms 40 has a first link 41 pivotally connected to the base 10 and located at the side of the opening 111 , and a first link 41 pivotally connected to the base 10 and located at one side of the first link 41 . The second link 42 , a third link 43 pivotally connected between the first link 41 and the moving member 30 , and a third link 43 pivotally connected between the first link 41 and the second link 42 the fourth link 44. Each first link 41 has a first pivot portion 411 pivotally connected to the base 10 , a first controlled end portion 412 located on one side of the first pivot portion 411 , and a first pivot portion 412 opposite to the first pivot portion 411 . A controlled end 412 is located at the first linking end 413 on the other side of the first pivoting portion 411 , and a first linking section 414 between the first linking end 413 and the first pivoting portion 411 is greater than the length of a first detent section 415 between the first detent end 412 and the first pivot portion 411, the distance between the pivot portion 32 and the axis L plus the first detent The length of a detent segment 415 is greater than that of the first pivot portion 411 and the axis the distance between L. The opposite ends of each third link 43 are pivotally connected to the corresponding pivot portion 32 and the first controlled end portion 412 . Each fourth link 44 is L-shaped and has a linking section 441 pivotally connected to the first link 41 and the second link 42 , and a clamping section 442 intersecting with the linking section 441 .

The stop blocks 50 are fixed to the clamping segments 442 .

In order to further understand the functions produced by the cooperation of the various elements of the present invention, the technical means used, and the expected effects, the following descriptions will be given.

1 , FIG. 3 and FIG. 4 , when the clamping device of the present invention is assembled as a whole and the object is clamped in place, the stop blocks 50 are in an open state away from the axis L.

As shown in FIG. 5 , the driving unit 20 is activated to drive the moving member 30 to move along the axis L, and the moving member 30 is moved from a position close to the top edge of the base 10 and above the opening 111 of the accommodating space 11 . When the moving member 30 moves downward to a position close to the lower position of the motor 21 , the downward movement of the moving member 30 will affect the third links 43 , and then the third links 43 will affect the third links 43 . The first links 41 are pivoted relative to the base 10 , and the first links 41 then drive the second links 42 to pivot relative to the base 10 through the fourth links 44 . The clamping segments 442 and the stop blocks 50 can be changed from the open state away from the axis L to the clamping state close to the axis L, and the stop blocks 50 can clamp objects (Fig. not shown), the clamps of these four-bar linkage 40 When the holding section 442 is in the holding state, the blocking blocks 50 approach each other.

When the driving unit 20 drives the moving member 30 to move in the opposite direction, the clamping segments 442 and the blocking blocks 50 can be converted from the clamping state approaching the axis L to being away from the axis L again. the open state.

Therefore, in the present invention, when the driving unit 20 drives the moving member 30 to move along the axis L, the four link mechanisms 40 can be linked, and the pivot linkage of the four link mechanisms 40 can be used to make the The clamping segment 442 and the blocking blocks 50 are switched between the open state and the clamping state, and the operation noise of the four-bar linkage mechanism 40 is low.

The motor 21 of the driving unit 20 is then disposed inside the accommodating space 11 of the base 10 , and the motor 21 is located on one side of the four-bar linkage 40 along the axis L, so that the clamping size range can be larger.

To sum up, the overall structure of the clamping device of the present invention is simple, the manufacture and assembly are easy, and the objectives of low operating noise and a wide range of clamping dimensions can be achieved, and the objectives of the present invention can indeed be achieved.

However, the above are only examples of the present invention, and should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the patent specification are still included in the scope of the present invention. within the scope of the invention patent.

10: Pedestal 11: Accommodating space 111: Opening 20: Drive unit 21: Motor 22: Output Department 221: External thread part 30: Moving parts 31: screw holes 32: Axis pivot 40: Four-bar linkage 41: The first link 411: The first pivot part 412: The first restrained end 413: The first linkage end 414: The first link 415: The first switch section 42: Second Link 43: Third Link 44: Fourth Link 441: Linkage segment 442: Clamping segment 50: Stop block

Claims (6)

A clamping device, comprising: a base including an accommodating space with an opening; a driving unit installed in the accommodating space and having an output portion corresponding to the opening and extending along an axis; a a moving part, which is movably arranged in the accommodating space, and has two pivot parts arranged on both sides of the axis; and two sets of four-link mechanisms, each of which has one pivotally connected to the base and located on the opening side a first link on the side, a second link pivotally connected to the base and located on one side of the first link, and a third link pivotally connected between the first link and the moving member, and a fourth link pivotally connected between the first link and the second link, the first link has a first pivot portion pivotally connected to the base, a a first detent end on one side of the connecting portion, and a first detent segment between the first detent end and the first pivot portion, between the pivot portion of the moving member and the axis The distance plus the length of the first detent segment is greater than the distance between the first pivot part and the axis. When the driving unit is activated and the moving piece is driven to move, the first link is pulled through the third link The first link drives the second link to pivot relative to the base through the fourth link. The clamping device according to claim 1, wherein the first link of each four-bar linkage further has a first link opposite to the first restrained end and located on the other side of the first pivoting part The linking end, the length of a first linking section between the first linking end and the first pivoting part is greater than the length of the first linking between the first restraining end and the first pivoting part length of the segment. The clamping device according to claim 1, wherein the fourth link of each four-bar linkage is L-shaped, and has a linkage section pivotally connected to the first link and the second link, and A clamping section intersecting with the interlocking section, the clamping device further includes two blocking blocks fixed to the clamping sections. The clamping device according to claim 3, wherein activating the driving unit can drive the moving member to move along an axis, and when the driving unit is activated to drive the moving member to move, the fourth link and the stopper block It is switchable between an open state away from the axis and a clamped state close to the axis. The clamping device according to claim 4, wherein when the clamping segments of the four-bar linkage mechanism are in the clamping state, the stop blocks approach each other. The clamping device according to claim 1, wherein the driving unit further has a motor, the output portion extends along an axis and is an output shaft of the motor, and has an external thread portion, and the moving member is screwed to the motor. The external thread portion, the motor of the drive unit is located on one side of the four-bar linkages along the axis.

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