TWM601662U

TWM601662U - Chuck capable of improving dustproof effect

Info

Publication number: TWM601662U
Application number: TW109204576U
Authority: TW
Inventors: 王松筠
Original assignee: 千島精密工業股份有限公司
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-09-21

Abstract

本創作有關於一種夾頭，其包含有一個本體，本體具有一個軸孔與至少二條相對軸孔呈放射狀排列之滑槽，各個滑槽內設置一個夾具。此外，本創作之夾頭更包含有一個防塵蓋、至少二個防塵板及一個壓板，防塵蓋設於本體且罩蓋軸孔的一端，該等防塵板抵接於防塵蓋且分別以其一端連接夾具，壓板抵接於該等防塵板，如此可以確保該等防塵板在跟著該等夾具移動的過程中，防塵板與防塵蓋之間隙可由大變小，甚至是到達無間隙的狀況，藉以進一步提升防塵效果。 This creation relates to a chuck, which includes a body with a shaft hole and at least two sliding grooves arranged radially with respect to the shaft hole, and a clamp is arranged in each sliding groove. In addition, the chuck of this creation further includes a dust cover, at least two dust plates, and a pressure plate. The dust cover is provided on the body and covers one end of the shaft hole. The dust plates abut against the dust cover and have one end The clamps are connected, and the pressure plate abuts against the dust-proof plates, so as to ensure that the gap between the dust-proof plate and the dust-proof cover can be reduced from large to small when the dust-proof plates move with the clamps, or even reach a state of no gap. Further enhance the dustproof effect.

Description

可提升防塵效果之夾頭 Chuck for improving dustproof effect

本創作與夾頭有關，特別是指一種可提升防塵效果之夾頭。This creation is related to the chuck, especially a chuck that can improve the dustproof effect.

一般的夾頭主要包含有一個本體，本體具有一個軸孔與至少二條滑槽，其中的軸孔用來安裝一個傳動機構(如拉桿)，至於各個滑槽則是用來安裝一個夾具。藉此，夾具可受傳動機構的傳動而沿著滑槽往復移動，用以夾持待加工工件。A general chuck mainly includes a body. The body has a shaft hole and at least two sliding grooves. The shaft hole is used to install a transmission mechanism (such as a pull rod), and each sliding groove is used to install a clamp. Thereby, the clamp can be driven by the transmission mechanism to move back and forth along the sliding groove to clamp the workpiece to be processed.

然而，工件在加工過程中會產生許多切削屑，這些切削屑很容易隨著切削液流入滑槽內並堆積在裡面慢慢生鏽，造成夾具與滑槽之間的摩擦力變大，如此一來，夾具於滑槽內移動時會受到摩擦力的影響而產生夾持力降低，亦可能會導致夾具的結構損壞。However, a lot of cutting chips will be generated during the processing of the workpiece. These cutting chips are easy to flow into the chute with the cutting fluid and accumulate in the chute slowly, causing the friction between the fixture and the chute to increase. In the future, when the clamp moves in the chute, it will be affected by friction, resulting in a reduction in the clamping force, which may also cause structural damage to the clamp.

為了解決切削屑的問題，請先參照圖1所示，目前的做法除了在軸孔處安裝一個防塵蓋2以外，另外在每個夾具1的前端安裝一個位於防塵蓋2上方之防塵板3，然後利用兩者之間的干涉配合來達到防塵效果。但是在實際操作中發現，夾具1在受到動力源的驅動之下對工件W進行夾持時，夾具1可能連同防塵板3一起發生上浮的情況(如圖1所示之假想線)，導致防塵板3與防塵蓋2之間有間隙D產生，如此一來，工件W的切削屑便有機會經由此一間隙D跑到滑槽內，導致防塵效果下降。In order to solve the problem of cutting chips, please refer to Figure 1. The current practice is to install a dust cover 2 at the shaft hole, and install a dust plate 3 above the dust cover 2 at the front end of each fixture 1. Then use the interference fit between the two to achieve the dustproof effect. However, in actual operation, it is found that when the clamp 1 is driven by the power source to clamp the workpiece W, the clamp 1 may rise together with the dustproof plate 3 (the imaginary line as shown in Fig. 1), resulting in dustproof There is a gap D between the plate 3 and the dust cover 2, so that the cutting chips of the workpiece W have a chance to run into the chute through this gap D, resulting in a decrease in the dust-proof effect.

本創作之主要目的在於提供一種夾頭，其能有效提升防塵效果。The main purpose of this creation is to provide a chuck which can effectively improve the dustproof effect.

為了達成上述主要目的，本創作之夾頭包含有一個本體、至少二夾具、一個防塵蓋、至少二防塵板，以及一個壓板。該本體具有一個第一側面與一個背對該第一側面之第二側面，該本體之中央具有一個貫穿該第一側面與該第二側面之軸孔，且該本體之第一側面具有至少二個連通該軸孔之滑槽，該等滑槽相對於該軸孔呈放射狀排列；該等夾具以可滑移的方式設於該本體之該等滑槽內，用以夾持待加工工件；該防塵蓋設於該本體之第一側面且罩蓋該本體之軸孔的一端；該等防塵板抵接於該防塵蓋背對該軸孔之一側面且分別以其一端連接一該夾具，使該等防塵板可跟著該等夾具同步移動；該壓板抵接於該等防塵板背對該防塵蓋之一側面，用以確保該等防塵板在跟著該等夾具移動的過程中與該防塵蓋緊密地抵靠在一起，使兩者之間不會有任何間隙的產生，進而達到提升防塵效果的目的。In order to achieve the above-mentioned main purpose, the chuck of this creation includes a body, at least two clamps, a dust cover, at least two dust plates, and a pressure plate. The body has a first side surface and a second side surface facing away from the first side surface, the center of the body has a shaft hole penetrating the first side surface and the second side surface, and the first side surface of the body has at least two A sliding groove connected to the shaft hole, the sliding grooves are arranged radially with respect to the shaft hole; the clamps are slidably arranged in the sliding grooves of the body to clamp the workpiece to be processed The dust cover is provided on the first side of the body and covers one end of the shaft hole of the body; the dust plates abut against one side of the shaft hole on the back of the dust cover and are connected to one end of the clamp respectively , So that the dust-proof plates can move synchronously with the fixtures; the pressing plate abuts against one side of the dust-proof cover behind the dust-proof plates to ensure that the dust-proof plates move with the fixtures while moving along with the fixtures. The dust-proof cover is pressed closely together, so that there will not be any gap between the two, thereby achieving the purpose of improving the dust-proof effect.

較佳地，該壓板可以是單件式結構或是多件式結構，若為前者，該壓板一次抵壓該等防塵板，若為後者，該壓板以一對一的方式抵壓該等防塵板。Preferably, the pressure plate can be a single-piece structure or a multi-piece structure. If the former, the pressure plate presses the dustproof plates at a time, and if the latter, the pressure plate presses the dustproof plates in a one-to-one manner. board.

較佳地，該壓板之外周緣具有至少二個缺口與至少二個抵壓部，各該缺口容納一該防塵板，各該抵壓部鄰接於一該缺口且抵壓一該防塵板。Preferably, the outer periphery of the pressing plate has at least two notches and at least two pressing portions, each of the notches accommodates a dustproof plate, and each of the pressing portions is adjacent to one of the notches and presses against the dustproof plate.

較佳地，該壓板朝該防塵蓋之一側面具有至少二條用來導引切削液之流道，該等流道與該等缺口呈交錯排列且相對一個位於中央之穿孔呈旋轉對稱，各該流道的寬度朝遠離該穿孔的方向逐漸減少，以利於切削液的排放。Preferably, the pressure plate has at least two flow channels for guiding the cutting fluid toward one side of the dust cover, and the flow channels and the notches are arranged in a staggered manner and are rotationally symmetrical with respect to a perforation located in the center. The width of the flow channel is gradually reduced toward the direction away from the perforation to facilitate the discharge of cutting fluid.

較佳地，各該防塵板背對該防塵蓋之一側面具有一個第一凹部與一個鄰接於該第一凹部之第一凸部，各該壓板朝該防塵蓋之一側面具有一個第二凹部與一個鄰接於該第二凹部之第二凸部，各該壓板之第二凹部與一該防塵板之第二凸部相互嵌卡且抵靠在一起，且各該壓板之第二凸部與一該防塵板之第二凹部相互嵌卡且抵靠在一起。藉由兩者之間的干涉配合來確保防塵效果。Preferably, each of the dust-proof plates has a first concave portion and a first convex portion adjacent to the first concave portion, and each of the pressure plates has a second concave portion facing one side of the dust-proof cover With a second convex portion adjacent to the second concave portion, the second concave portion of each pressing plate and the second convex portion of the dust-proof plate are embedded and abutted with each other, and the second convex portion of each pressing plate and The second recesses of the dust-proof plate are embedded and pressed against each other. Through the interference between the two to ensure the dustproof effect.

有關本創作所提供對於可提升防塵效果之夾頭的詳細構造、特點、組裝或使用方式，將於後續的實施方式詳細說明中予以描述。然而，在本創作領域中具有通常知識者應能瞭解，該等詳細說明以及實施本創作所列舉的特定實施例，僅係用於說明本創作，並非用以限制本創作之專利申請範圍。The detailed structure, characteristics, assembly or use of the chuck that can improve the dustproof effect provided by this creation will be described in the detailed description of the subsequent implementation. However, those with ordinary knowledge in the field of creation should be able to understand that these detailed descriptions and specific embodiments listed in the implementation of this creation are only used to illustrate the creation and are not intended to limit the scope of patent applications for this creation.

申請人首先在此說明，於整篇說明書中，包括以下介紹的實施例以及申請專利範圍的請求項中，有關方向性的名詞皆以圖式中的方向為基準。其次，在以下將要介紹之實施例以及圖式中，相同之元件標號，代表相同或近似之元件或其結構特徵。The applicant first explains here that throughout the specification, including the following embodiments and claims in the scope of the patent application, the nouns related to directionality are based on the directions in the drawings. Secondly, in the following embodiments and drawings, the same element numbers represent the same or similar elements or structural features.

請參閱圖2及圖3，本創作第1實施例之夾頭10包含有一個本體20、一個拉桿30、三個夾具40、一個防塵蓋50、三個防塵板52，以及一個壓板60。2 and 3, the chuck 10 of the first embodiment of the present creation includes a body 20, a tie rod 30, three clamps 40, a dust cover 50, three dust plates 52, and a pressure plate 60.

本體20具有一個第一側面22與一個背對於第一側面22之第二側面24。本體20之中央具有一個貫穿第一側面22與第二側面24之軸孔26，本體20之第一側面22具有三條連通軸孔26之滑槽28，三條滑槽28相對軸孔26呈放射狀排列。The main body 20 has a first side surface 22 and a second side surface 24 opposite to the first side surface 22. The center of the main body 20 has a shaft hole 26 penetrating through the first side surface 22 and the second side surface 24. The first side surface 22 of the main body 20 has three sliding grooves 28 communicating with the shaft holes 26. The three sliding grooves 28 are radial with respect to the shaft hole 26. arrangement.

拉桿30設於本體20之軸孔26內且可受動力源(圖中未示)的驅動而沿著軸孔26之軸向位移。此外，拉桿30之一端具有三條T形斜槽32，三條T形斜槽32以一對一的方式對應於本體20之三條滑槽28。The pull rod 30 is disposed in the shaft hole 26 of the main body 20 and can be driven by a power source (not shown in the figure) to move along the axial direction of the shaft hole 26. In addition, one end of the pull rod 30 has three T-shaped chute grooves 32, and the three T-shaped chute grooves 32 correspond to the three sliding grooves 28 of the main body 20 in a one-to-one manner.

如圖3、圖4及圖7所示，各個夾具40具有一個滑座41，滑座41設於本體20之滑槽28內，且滑座41之一端具有一個T形斜塊42，滑座41以T形斜塊42嵌設於拉桿30之T形斜槽32內，使滑座41能藉由拉桿30之位移而沿著本體20之滑槽28位移。各個夾具40更具有一個用來夾持待加工工件之夾爪44，夾爪44利用二根螺栓45鎖設於二個螺塊46，二個螺塊46則是以可滑移的方式設於滑座41之一個調整槽43內。藉此，當旋鬆二根螺栓45時，即可透過二個螺塊46的位移來調整夾爪44相對於軸孔26的位置，當鎖緊二根螺栓45時即可固定夾爪44的位置。As shown in Figures 3, 4 and 7, each clamp 40 has a sliding seat 41 which is arranged in the sliding groove 28 of the main body 20, and one end of the sliding seat 41 has a T-shaped inclined block 42. In 41, a T-shaped inclined block 42 is embedded in the T-shaped chute 32 of the tie rod 30, so that the sliding seat 41 can move along the sliding groove 28 of the main body 20 by the displacement of the tie rod 30. Each clamp 40 further has a clamping jaw 44 for clamping the workpiece to be processed. The clamping jaw 44 is locked on the two screw blocks 46 by two bolts 45, and the two screw blocks 46 are slidably arranged on the Inside an adjustment slot 43 of the sliding seat 41. Therefore, when the two bolts 45 are loosened, the position of the clamping jaw 44 relative to the shaft hole 26 can be adjusted by the displacement of the two screws 46, and the clamping jaw 44 can be fixed when the two bolts 45 are locked. position.

防塵蓋50設於本體20之第一側面22且蓋住軸孔26之一端，如圖2、圖7及圖8所示，用以避免工件的切削屑進入軸孔26內對拉桿30或其他構件造成損壞。The dust cover 50 is provided on the first side surface 22 of the main body 20 and covers one end of the shaft hole 26, as shown in Figs. 2, 7 and 8, to prevent the cutting chips of the workpiece from entering the shaft hole 26 to the tie rod 30 or other The component is damaged.

各個防塵板52抵接於防塵蓋50背對軸孔26之一側面且利用二根螺絲54鎖設於各個夾具40之滑座41，如圖2、圖7及圖8所示，使各個防塵板52能與各個夾具40之滑座41同步作動，用以防止工件的切削屑隨著切削液流入滑槽28內。Each dust-proof plate 52 abuts against one side of the dust-proof cover 50 facing away from the shaft hole 26 and is locked on the sliding seat 41 of each clamp 40 with two screws 54, as shown in FIG. 2, FIG. 7 and FIG. The plate 52 can operate synchronously with the sliding seat 41 of each clamp 40 to prevent the cutting chips of the workpiece from flowing into the sliding groove 28 with the cutting fluid.

壓板60在本實施例中為單一板材。壓板60位於三個夾爪44與三個防塵板52之間，並利用三根螺絲65連同防塵蓋50一起組設於本體20，如圖2、圖7及圖8所示，用以輔助防塵蓋50防止工件的切削屑進入軸孔26內。如圖5及圖6所示，壓板60之外周緣具有三個缺口61與三個抵壓部62，各個缺口61容納一個防塵板52，各個抵壓部62鄰接於缺口61且抵壓一個防塵板52，用以確保三個防塵板52緊密貼抵於防塵蓋50。此外，壓板60朝防塵蓋50之一側面具有三條用來導引切削液排出之流道63，三條流道63與三個缺口61呈交錯排列且相對一個位於中央之穿孔64呈旋轉對稱，此外，各個流道63的寬度朝遠離穿孔64的方向逐漸減少，以利於切削液的排放。The pressing plate 60 is a single plate in this embodiment. The pressing plate 60 is located between the three clamping jaws 44 and the three dustproof plates 52, and is assembled on the main body 20 with three screws 65 together with the dustproof cover 50, as shown in Figures 2, 7 and 8, to assist the dustproof cover 50 prevents the cutting chips of the workpiece from entering the shaft hole 26. As shown in Figures 5 and 6, the outer periphery of the pressure plate 60 has three notches 61 and three pressing parts 62. Each notch 61 accommodates a dustproof plate 52, and each pressing part 62 is adjacent to the notch 61 and presses a dustproof plate. The plate 52 is used to ensure that the three dust-proof plates 52 closely adhere to the dust-proof cover 50. In addition, the pressure plate 60 has three flow passages 63 for guiding the discharge of cutting fluid toward one side of the dust cover 50. The three flow passages 63 and the three notches 61 are arranged in a staggered arrangement and are rotationally symmetric with respect to a perforation 64 located in the center. , The width of each flow channel 63 gradually decreases toward the direction away from the perforation 64 to facilitate the discharge of cutting fluid.

經由上述結構可知，當工件在進行切削的過程中，由於三個防塵板52被壓板60所持續抵壓著，使得三個防塵板52與防塵蓋50之間能保持緊密貼合的關係，如圖6所示，以確保兩者之間不會有任何間隙的產生，進而有效阻擋切削屑的進入。另外藉由壓板60的流道設計，可幫助切削液的排出，以減少切削液進入軸孔26或滑槽28的機會。It can be seen from the above structure that when the workpiece is being cut, since the three dustproof plates 52 are continuously pressed by the pressing plate 60, the three dustproof plates 52 and the dustproof cover 50 can maintain a close fitting relationship, such as As shown in Figure 6, to ensure that there will not be any gap between the two, thereby effectively blocking the entry of cutting chips. In addition, the flow channel design of the pressure plate 60 can help the cutting fluid to be discharged, so as to reduce the chance of the cutting fluid entering the shaft hole 26 or the sliding groove 28.

另一方面，壓板不限於單件式結構，亦可為多件式結構。如圖9及圖10所示，在本創作第2實施例之夾頭12中，壓板80由三個子壓板82所構成，各個子壓板82利用二根螺絲88鎖設於防塵蓋50背對軸孔26之一側面且以一對一的方式抵壓於三個防塵板70。此外，如圖10至圖12所示，各個防塵板70背對防塵蓋50之一側面具有一個第一凹部71與一個鄰接於第一凹部71之第一凸部72，各個子壓板82朝防塵蓋50之一側面具有一個第二凹部84與一個鄰接於第二凹部84之第二凸部86，子壓板82之第二凹部84與防塵板70之第二凸部86相互嵌卡，且子壓板82之第二凸部86與防塵板70之第二凹部84相互嵌卡。藉由兩者之間的干涉配合，可有效阻擋切削液的進入。On the other hand, the pressure plate is not limited to a single-piece structure, but can also be a multi-piece structure. As shown in Figures 9 and 10, in the chuck 12 of the second embodiment of the present creation, the pressing plate 80 is composed of three sub-pressing plates 82, and each of the sub-pressing plates 82 is locked to the dust cover 50 with two screws 88 back to the axis. One side of the hole 26 is pressed against the three dust-proof plates 70 in a one-to-one manner. In addition, as shown in FIGS. 10 to 12, each dust-proof plate 70 has a first concave portion 71 and a first convex portion 72 adjacent to the first concave portion 71 on one side of each dust-proof plate 70 facing away from the dust-proof cover 50. One side of the cover 50 has a second concave portion 84 and a second convex portion 86 adjacent to the second concave portion 84. The second concave portion 84 of the sub-pressing plate 82 and the second convex portion 86 of the dust-proof plate 70 are interlocked with each other, and The second convex portion 86 of the pressing plate 82 and the second concave portion 84 of the dust-proof plate 70 are embedded in each other. The interference fit between the two can effectively block the entry of cutting fluid.

1:夾具 2:防塵蓋 3:防塵板 D:間隙 W:工件 10:夾頭 12:夾頭 20:本體 22:第一側面 24:第二側面 26:軸孔 28:滑槽 30:拉桿 32:T形斜槽 40:夾具 41:滑座 42:T形斜塊 43:調整槽 44:夾爪 45:螺栓 46:螺塊 50:防塵蓋 52:防塵板 54:螺絲 60:壓板 61:缺口 62:抵壓部 63:流道 64:穿孔 65:螺絲 70:防塵板 71:第一凹部 72:第一凸部 80:壓板 82:子壓板 84:第二凹部 86:第二凸部 88:螺絲 1: Fixture 2: Dust cover 3: Dustproof board D: gap W: Workpiece 10: Chuck 12: Chuck 20: body 22: first side 24: second side 26: Shaft hole 28: Chute 30: lever 32: T-shaped chute 40: Fixture 41: Slide 42: T-shaped oblique block 43: adjustment slot 44: Gripper 45: Bolt 46: snail block 50: Dust cover 52: Dust Board 54: Screw 60: pressure plate 61: gap 62: Pressure Department 63: runner 64: Piercing 65: Screw 70: Dust Board 71: The first recess 72: first convex 80: pressure plate 82: Sub plate 84: second recess 86: second convex 88: Screw

圖1為習用夾頭的局部放大示意圖。圖2為本創作第1實施例之夾頭的立體圖。圖3為本創作第1實施例之夾頭的局部立體分解圖。圖4為本創作第1實施例之夾頭所提供之夾具的立體分解圖。圖5為本創作第1實施例之夾頭所提供之壓板的底視立體圖。圖6為本創作第1實施例之夾頭所提供之壓板的平面圖。圖7為本創作第1實施例之夾頭的剖視圖。圖8為圖7的局部放大圖。圖9為本創作第2實施例之夾頭的立體圖。圖10為本創作第2實施例之夾頭的局部立體分解圖。圖11為本創作第2實施例之夾頭所提供之子壓板的底視立體圖。圖12為本創作第2實施例之夾頭的局部放大剖視圖。 Figure 1 is a partial enlarged schematic view of a conventional chuck. Figure 2 is a perspective view of the chuck of the first embodiment of the creation. Figure 3 is a partial three-dimensional exploded view of the chuck of the first embodiment of the creation. Fig. 4 is a perspective exploded view of the clamp provided by the chuck of the first embodiment of the creation. Figure 5 is a bottom perspective view of the pressure plate provided by the chuck of the first embodiment of the creation. Figure 6 is a plan view of the pressure plate provided by the chuck of the first embodiment of the creation. Figure 7 is a cross-sectional view of the chuck of the first embodiment of the creation. Fig. 8 is a partial enlarged view of Fig. 7. Figure 9 is a perspective view of the chuck of the second embodiment of the creation. Figure 10 is a partial three-dimensional exploded view of the chuck of the second embodiment of the creation. Fig. 11 is a bottom perspective view of the sub-press plate provided by the chuck of the second embodiment of the creation. Figure 12 is a partial enlarged cross-sectional view of the chuck according to the second embodiment of the creation.

10:夾頭 10: Chuck

20:本體 20: body

41:滑座 41: Slide

44:夾爪 44: Gripper

52:防塵板 52: Dust Board

60:壓板 60: pressure plate

Claims

一種夾頭，包含有：一本體，具有一第一側面與一背對該第一側面之第二側面，該本體之中央具有一貫穿該第一側面與該第二側面之軸孔，該本體之第一側面具有至少二分別連通該軸孔之滑槽，該等滑槽相對於該軸孔呈放射狀排列；至少二夾具，可滑移地設於該本體之該至少二滑槽內；一防塵蓋，設於該本體之第一側面且罩蓋該本體之軸孔的一端；至少二防塵板，抵接於該防塵蓋背對該軸孔之一側面且分別以其一端連接一該夾具；以及一壓板，抵接於該等防塵板背對該防塵蓋之一側面。 A chuck that contains: A body has a first side surface and a second side surface facing away from the first side surface, the center of the body has a shaft hole penetrating the first side surface and the second side surface, and the first side surface of the body has at least two The sliding grooves respectively connected with the shaft hole, and the sliding grooves are arranged radially with respect to the shaft hole; At least two clamps are slidably arranged in the at least two sliding grooves of the body; A dust cover, arranged on the first side of the body and covering one end of the shaft hole of the body; At least two dust-proof plates abut against a side surface of the shaft hole on the back of the dust-proof cover, and one end of the dustproof plate is connected to the clamp; and A pressing plate abuts against one side of the dustproof cover behind the dustproof plates.

如請求項1所述之夾頭，其中，該壓板為單一板材，該壓板蓋住該防塵蓋且與該防塵蓋共同設於該本體之第一側面。The chuck according to claim 1, wherein the pressing plate is a single plate, and the pressing plate covers the dust cover and is co-located with the dust cover on the first side surface of the body.

如請求項2所述之夾頭，其中，該壓板之外周緣具有至少二缺口與至少二抵壓部，各該缺口容納一該防塵板，各該抵壓部鄰接於一該缺口且抵壓一該防塵板。The chuck according to claim 2, wherein the outer periphery of the pressing plate has at least two notches and at least two pressing portions, each of the notches accommodates a dustproof plate, and each of the pressing portions is adjacent to one of the notches and presses One the dust-proof board.

如請求項3所述之夾頭，其中，該壓板朝該防塵蓋之一側面具有至少二流道，該等流道與該等缺口呈交錯排列。The chuck according to claim 3, wherein the pressure plate has at least two runners facing one side of the dust cover, and the runners and the notches are arranged in a staggered manner.

如請求項4所述之夾頭，其中，該壓板之中央具有一穿孔，該等流道相對於該穿孔呈旋轉對稱。The chuck according to claim 4, wherein the pressure plate has a perforation in the center, and the flow channels are rotationally symmetrical with respect to the perforation.

如請求項5所述之夾頭，其中，各該流道的寬度朝遠離該穿孔的方向逐漸減少。The chuck according to claim 5, wherein the width of each flow channel gradually decreases in a direction away from the perforation.

如請求項1所述之夾頭，其中，該壓板具有至少二子壓板，各該子壓板設於該防塵蓋背對該軸孔之一側面且抵壓於一該防塵板。The chuck according to claim 1, wherein the pressing plate has at least two sub-pressing plates, and each of the sub-pressing plates is arranged on a side of the shaft hole behind the dust cover and pressed against a dust-proof plate.

如請求項7所述之夾頭，其中，各該防塵板背對該防塵蓋之一側面具有一第一凹部與一鄰接於該第一凹部之第一凸部，各該子壓板朝該防塵蓋之一側面具有一第二凹部與一鄰接於該第二凹部之第二凸部，各該子壓板之第二凹部與一該防塵板之第二凸部相互嵌卡，且各該子壓板之第二凸部與一該防塵板之第二凹部相互嵌卡。The chuck according to claim 7, wherein each of the dust-proof plates has a first concave portion and a first convex portion adjacent to the first concave portion, and each of the sub-pressing plates faces the dust-proof cover. One side of the cover has a second concave portion and a second convex portion adjacent to the second concave portion, the second concave portion of each of the sub-pressing plates and the second convex portion of the dust-proof plate are embedded in each other, and each of the sub-pressing plates The second convex part and the second concave part of the dust-proof plate are embedded in each other.