TWM493422U - Tailstock device of machine tools for deep hole processing - Google Patents
Tailstock device of machine tools for deep hole processing Download PDFInfo
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- TWM493422U TWM493422U TW103217045U TW103217045U TWM493422U TW M493422 U TWM493422 U TW M493422U TW 103217045 U TW103217045 U TW 103217045U TW 103217045 U TW103217045 U TW 103217045U TW M493422 U TWM493422 U TW M493422U
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Description
本新型是有關於一種工具機，特別是指一種工具機深孔加工的尾座裝置。The utility model relates to a machine tool, in particular to a tailstock device for deep hole machining of a machine tool.
習知裝設於工具機的基座上，且能用於深孔加工的尾座裝置，其相對於基座的移動方式通常是藉由連接設置於兩者之間的皮帶及馬達作為驅動，惟這樣的設計往往因皮帶本身結構仍存在彈性，而將造成尾座裝置無法精準定位的缺點。A tailstock device that is mounted on a base of a machine tool and can be used for deep hole machining, and the manner of movement relative to the base is generally driven by connecting a belt and a motor disposed between the two. However, such a design often has the disadvantage that the structure of the belt itself is still elastic, which will result in the inability of the tailstock device to be accurately positioned.
因此，本新型之目的，即在提供一種能有效降低移動時的背隙，並具有較高定位精準度的工具機深孔加工的尾座裝置。Therefore, the object of the present invention is to provide a tailstock device for deep hole machining of a machine tool which can effectively reduce the backlash during movement and has high positioning accuracy.
於是，本新型工具機深孔加工的尾座裝置，該工具機包含一機架、一設置於該機架且包括一能夾持一工件做高速轉動之主軸頭的主軸單元、一設置在該機架且能相對於該主軸單元滑移的刀塔單元，該尾座裝置與該主軸單元相間隔設置於該機架上，並包含一移動基座、一下移動單元、一尾座本體，及一上移動單元。Therefore, the tail tool device of the deep hole machining of the new machine tool comprises a frame, a spindle unit disposed on the frame and including a spindle head capable of clamping a workpiece for high-speed rotation, a turret unit that is slidable relative to the spindle unit, the tailstock device is disposed on the frame at a distance from the spindle unit, and includes a moving base, a lower moving unit, a tailstock body, and One mobile unit.
該移動基座連接設置於該機架上，且能相對於該機架沿一第一方向滑移。The mobile base is coupled to the frame and is slidable relative to the frame in a first direction.
該下移動單元設置在該機架及該移動基座之間，並包括一能驅動該移動基座，且具有一下導螺桿的下傳動模組。The lower moving unit is disposed between the frame and the moving base, and includes a lower driving module capable of driving the moving base and having a lower lead screw.
該尾座本體連接設置於該移動基座上，且能相對於該移動基座沿一正交於該第一方向的第二方向滑移，並包括沿該第二方向並排設置的一頂心及一能裝設一內孔刀具的刀具安裝孔。The tailstock body is coupled to the moving base and is slidable relative to the moving base in a second direction orthogonal to the first direction, and includes a top center disposed along the second direction And a tool mounting hole capable of mounting a bore tool.
該上移動單元設置在該移動基座及該尾座本體之間，並包括一能驅動該尾座本體的上傳動模組。The upper moving unit is disposed between the moving base and the tailstock body and includes an upper transmission module capable of driving the tailstock body.
本新型之功效在於，藉由設置該下導螺桿及該上導螺桿，能有效降低背隙，進而提高定位的精準度。The effect of the novel is that by providing the lower lead screw and the upper lead screw, the backlash can be effectively reduced, thereby improving the positioning accuracy.
L1‧‧‧第一方向L1‧‧‧ first direction
L2‧‧‧第二方向L2‧‧‧ second direction
2‧‧‧工具機2‧‧‧Tool machine
201‧‧‧工件201‧‧‧Workpiece
202‧‧‧內孔刀具202‧‧‧ hole cutter
21‧‧‧機架21‧‧‧Rack
22‧‧‧主軸單元22‧‧‧ spindle unit
221‧‧‧主軸頭221‧‧‧ spindle head
23‧‧‧刀塔單元23‧‧‧Knife Unit
24‧‧‧尾座裝置24‧‧‧Tailstock device
3‧‧‧移動基座3‧‧‧Mobile base
4‧‧‧下移動單元4‧‧‧Mobile unit
41‧‧‧下導引模組41‧‧‧Lower guide module
411‧‧‧第一下滑動件411‧‧‧First lower slide
412‧‧‧第二下滑動件412‧‧‧Second lower slide
413‧‧‧夾緊器413‧‧‧Clamps
414‧‧‧固定塊414‧‧‧Fixed block
415‧‧‧夾緊件415‧‧‧Clamping parts
416‧‧‧滾輪416‧‧‧Roller
417‧‧‧調整螺絲417‧‧‧Adjustment screw
42‧‧‧下傳動模組42‧‧‧lower drive module
421‧‧‧下導螺桿421‧‧‧ lower lead screw
422‧‧‧馬達422‧‧‧Motor
43‧‧‧下剎車模組43‧‧‧Behind brake module
431‧‧‧齒排431‧‧‧ teeth row
432‧‧‧嚙合器432‧‧‧Meshing device
433‧‧‧氣壓缸433‧‧‧ pneumatic cylinder
434‧‧‧嚙合件434‧‧‧Meshing parts
5‧‧‧尾座本體5‧‧‧Tailstock body
51‧‧‧頂心51‧‧‧Top
52‧‧‧刀具安裝孔52‧‧‧Tool mounting hole
6‧‧‧上移動單元6‧‧‧Upper mobile unit
61‧‧‧上導引模組61‧‧‧Upper Guide Module
611‧‧‧第一上滑動件611‧‧‧First upper slide
612‧‧‧第二上滑動件612‧‧‧Second upper slide
62‧‧‧上傳動模組62‧‧‧Upper drive module
621‧‧‧上導螺桿621‧‧‧Upper lead screw
622‧‧‧馬達622‧‧‧Motor
623‧‧‧主動輪623‧‧‧Drive wheel
624‧‧‧從動輪624‧‧‧ driven wheel
625‧‧‧連動件625‧‧‧ linkages
63‧‧‧擋止器63‧‧‧stops
631‧‧‧限位件631‧‧‧Limited parts
632‧‧‧擋止銷632‧‧ ‧ stop pin
本新型之其他的特徵及功效，將於參照圖式的實施方式中清楚地呈現，其中：圖1是一立體組合圖，說明本新型工具機深孔加工的尾座裝置之一實施例的組合位置關係；圖2是一說明該實施例的示意圖；圖3是一示意圖，說明該實施例移除該尾座本體後的狀態；及圖4是一說明該實施例的示意圖。Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a perspective view showing a combination of one embodiment of the tailstock device for deep hole machining of the present utility machine. FIG. 2 is a schematic view showing the state of the embodiment; FIG. 3 is a schematic view showing a state in which the tailstock body is removed by the embodiment; and FIG. 4 is a schematic view illustrating the embodiment.
如圖1、圖2，及圖4所示，本新型工具機深孔 加工的尾座裝置之實施例適用於裝設在一工具機2，該工具機2包含一機架21、一設置於該機架21且包括一能夾持一工件201做高速轉動之主軸頭221的主軸單元22，及一設置在該機架21且能相對於該主軸單元22滑移的刀塔單元23。該尾座裝置24與該主軸單元22相間隔設置於該機架21上，且能用於深孔加工，並包含一移動基座3、一下移動單元4、一尾座本體5，及一上移動單元6。As shown in Figure 1, Figure 2, and Figure 4, the new machine tool deep hole The embodiment of the processed tailstock device is suitable for being mounted on a machine tool 2, the machine tool 2 comprising a frame 21, a spindle 21 disposed on the frame 21 and including a spindle head capable of holding a workpiece 201 for high-speed rotation A spindle unit 22 of 221, and a turret unit 23 disposed in the frame 21 and slidable relative to the spindle unit 22. The tailstock device 24 is disposed on the frame 21 at a distance from the spindle unit 22, and can be used for deep hole processing, and includes a moving base 3, a lower moving unit 4, a tailstock body 5, and an upper portion. Mobile unit 6.
該移動基座3連接設置於該機架21上，且能相 對於該機架21沿一第一方向L1滑移。於本實施例中，該第一方向L1即為該工件201的軸方向。The mobile base 3 is connected to the frame 21, and can be phased The frame 21 is slid in a first direction L1. In the embodiment, the first direction L1 is the axial direction of the workpiece 201.
如圖1、圖2，及圖3所示，該下移動單元4設 置在該機架21及該移動基座3之間，並包括一下導引模組41、一下傳動模組42，及一下剎車模組43。As shown in FIG. 1, FIG. 2, and FIG. 3, the lower moving unit 4 is provided. The utility model is disposed between the frame 21 and the mobile base 3, and includes a lower guiding module 41, a lower transmission module 42, and a lower brake module 43.
該下導引模組41具有二間隔設置於該機架21 的第一下滑動件411、二分別對應該等第一下滑動件411且連接設置於該移動基座3的第二下滑動件412，及一設置於該移動基座3上，且能使該等第一下滑動件411及該等第二下滑動件412恆保持接觸滑動的夾緊器413。The lower guiding module 41 has two spacings disposed on the frame 21 The first lower sliding member 411 and the second pair respectively correspond to the first lower sliding member 411 and are connected to the second lower sliding member 412 of the moving base 3, and are disposed on the moving base 3, and can The first lower slider 411 and the second lower slider 412 are constantly held in contact with the sliding clamp 413.
於本實施例中，該等第一下滑動件411分別是 呈倒L型的導軌，該等第二下滑動件412結合形成一倒T型的導軌，並藉由滑動接觸的方式移載，惟該等第一下滑動件411及該等第二下滑動件412亦能是線性滑軌及滑塊，當不能以此為限。In this embodiment, the first lower sliding members 411 are respectively In the form of an inverted L-shaped guide rail, the second lower sliding members 412 are combined to form an inverted T-shaped guide rail, and are transferred by sliding contact, but the first lower sliding member 411 and the second lower sliding member The member 412 can also be a linear slide rail and a slider, which cannot be limited thereto.
該夾緊器413設置於該移動基座3，且位於鄰近 該主軸單元22的一側，並具有一固定於該移動基座3的固定塊414、一穿設於該固定塊414的夾緊件415、二分別對應該第一下滑動件411對稱設置在該夾緊件415的滾輪416，及一樞轉穿設於該夾緊件415，且能頂抵於該固定塊414的調整螺絲417，藉由樞轉該調整螺絲417能移動該夾緊件415，進而調整該等滾輪416夾持該等第一下滑動件411的力道，藉此達到優異的移載精度。The clamp 413 is disposed on the mobile base 3 and is adjacent to the One side of the spindle unit 22 has a fixing block 414 fixed to the moving base 3, a clamping member 415 penetrating the fixing block 414, and two corresponding symmetrically disposed on the first lower sliding member 411. The roller 416 of the clamping member 415 and an adjusting screw 417 pivotally disposed on the clamping member 415 and capable of abutting against the fixing block 414 can be moved by pivoting the adjusting screw 417 415, further adjusting the force of the rollers 416 to clamp the first lower sliders 411, thereby achieving excellent transfer accuracy.
該下傳動模組42能驅動該移動基座3，並具有 一與該下導引模組41相間隔設置的下導螺桿421。該下導螺桿421能藉由裝設一馬達422而受驅轉動，較佳的，該馬達422是伺服馬達。The lower transmission module 42 can drive the mobile base 3 and has A lower lead screw 421 disposed at a distance from the lower guiding module 41. The lower lead screw 421 can be driven to rotate by mounting a motor 422. Preferably, the motor 422 is a servo motor.
該下剎車模組43具有一固定在該機架21的齒 排431，及複數對應該齒排431間隔裝設在該移動基座3，且能鄰近及遠離該齒排431的嚙合器432。The lower brake module 43 has a tooth fixed to the frame 21 The row 431, and the plurality of corresponding tooth rows 431 are spaced apart from the moving base 3 and are adjacent to and away from the toothed 432 of the tooth row 431.
於本實施例中，該等嚙合器432的數量為二，並分別具有一氣壓缸433，及一能藉由該氣壓缸433伸出及縮回，且表面形狀對應於該齒排431的的嚙合件434，該等嚙合器432能藉由該氣壓缸433，使該嚙合件434嚙合於該齒排431，進而將該移動基座3限位固定於該機架21上。惟該下剎車模組43的嚙合器432的數量也能僅為一，當不能以此為限。In the present embodiment, the number of the engaging members 432 is two, and each has a pneumatic cylinder 433, and a cylinder 433 can be extended and retracted by the pneumatic cylinder 433, and the surface shape corresponds to the tooth row 431. The engaging member 434 can engage the engaging member 434 on the tooth row 431 by the pneumatic cylinder 433 to fix the moving base 3 to the frame 21. However, the number of the engaging arms 432 of the lower brake module 43 can also be only one, and cannot be limited thereto.
該尾座本體5連接設置於該移動基座3上，且能相對於該移動基座3沿一正交於該第一方向L1的第二方 向L2滑移，並包括沿該第二方向L2並排設置的一頂心51，及一能裝設一內孔刀具202的刀具安裝孔52。The tailstock body 5 is connected to the moving base 3 and can be along a second side orthogonal to the first direction L1 with respect to the moving base 3 Sliding to L2, and including a top core 51 disposed side by side along the second direction L2, and a tool mounting hole 52 capable of mounting a bore cutter 202.
該上移動單元6設置在該移動基座3及該尾座本體5之間，並包括一上導引模組61、一能驅動該尾座本體5的上傳動模組62，及一設置於該移動基座3及該尾座本體5之間的擋止器63。The upper moving unit 6 is disposed between the mobile base 3 and the tailstock body 5, and includes an upper guiding module 61, an upper transmission module 62 capable of driving the tailstock body 5, and a The movement base 3 and the stopper 63 between the tailstock body 5.
該上導引模組61具有二間隔設置於該移動基座3的第一上滑動件611，及二分別對應該等第一上滑動件611，且連接設置於該尾座本體5的第二上滑動件612。The upper guiding module 61 has two first upper sliding members 611 spaced apart from the moving base 3, and two corresponding upper first sliding members 611 respectively, and connected to the second tailing body 5 Upper slider 612.
於本實施例中，該等第一上滑動件611是呈倒L型的導軌，該等第二上滑動件612結合形成一倒T型的導軌，並藉由滑動接觸的方式移載，惟該等第一上滑動件611及該等第二上滑動件612亦能是線性滑軌及滑塊，當不能以此為限。In this embodiment, the first upper sliding members 611 are inverted L-shaped guide rails, and the second upper sliding members 612 are combined to form an inverted T-shaped guide rail, and are transferred by sliding contact, The first upper sliding member 611 and the second upper sliding member 612 can also be linear sliding rails and sliders, which are not limited thereto.
該上傳動模組62具有一上導螺桿621、一能驅動該上導螺桿621的馬達622、一與該馬達622相連接的主動輪623、一與該上導螺桿621相連接的從動輪624，及一連接設置於該主動輪623及該從動輪624之間的連動件625。較佳的，該馬達622是伺服馬達。此外，於本實施例中，該連動件625為皮帶，該主動輪623及該從動輪624皆為皮帶輪，且該主動輪623的外徑小於該從動輪624的外徑，藉此達到減速的功效。惟該主動輪623與該從動輪624，及該連動件625亦能是鍊輪及鍊條，該上傳動模組62的該馬達622亦能僅藉由一聯軸器(圖未示)直接連接驅動 該上導螺桿621，而不另外裝設該主動輪623、該從動輪624，及該連動件625，當不能以此為限。The upper transmission module 62 has an upper lead screw 621, a motor 622 capable of driving the upper lead screw 621, a driving wheel 623 connected to the motor 622, and a driven wheel 624 connected to the upper lead screw 621. And a linkage 625 disposed between the driving wheel 623 and the driven wheel 624. Preferably, the motor 622 is a servo motor. In addition, in the embodiment, the linking member 625 is a belt, and the driving wheel 623 and the driven wheel 624 are both pulleys, and the outer diameter of the driving wheel 623 is smaller than the outer diameter of the driven wheel 624, thereby achieving deceleration. efficacy. The driving wheel 623 and the driven wheel 624, and the linking member 625 can also be a sprocket and a chain. The motor 622 of the upper transmission module 62 can also be directly connected by only a coupling (not shown). drive The upper lead screw 621 is not provided with the driving wheel 623, the driven wheel 624, and the linking member 625.
該擋止器63具有一設置於該移動基座3及該尾 座本體5的其中之一的限位件631，及一對應該限位件631設置於該移動基座3及該尾座本體5的其中另一，且能鄰近及遠離該限位件631的擋止銷632。當該擋止銷632鄰近對應該限位件631時，能藉此限位該限位件631並讓該尾座本體5的該頂心51恆位於一固定位置，藉此與該主軸單元22的主軸頭221保持同軸轉動。The stopper 63 has a set on the moving base 3 and the tail The limiting member 631 of the one of the seat body 5 and the pair of the limiting member 631 are disposed on the other of the moving base 3 and the tailstock body 5, and can be adjacent to and away from the limiting member 631. Stop pin 632. When the stopping pin 632 is adjacent to the corresponding limiting member 631, the limiting member 631 can be restrained and the top center 51 of the tailstock body 5 can be kept at a fixed position, thereby being with the spindle unit 22 The spindle head 221 remains coaxially rotated.
當操作者欲藉由該刀塔單元23進行該工件201 的加工時，能利用該上移動單元6的該擋止器63將該尾座本體5的該頂心51設置於該工件201的旋轉軸線上，接著藉由該下移動單元4的該下導引模組41及下傳動模組42將該頂心51頂抵於該工件201後，再將該下剎車模組43的該嚙合器432嚙合於該齒排431，進而將該移動基座3限位固定於該機架21上，達到精準定位的優點。When the operator wants to perform the workpiece 201 by the turret unit 23 When the machining is performed, the stopper 51 of the upper moving unit 6 can be used to set the top core 51 of the tailstock body 5 on the rotation axis of the workpiece 201, and then the lower guide of the lower moving unit 4 After the lead frame 51 and the lower drive module 42 abut the top core 51 against the workpiece 201, the meshing device 432 of the lower brake module 43 is engaged with the tooth row 431, and the moving base 3 is further The limit is fixed on the frame 21 to achieve the advantage of precise positioning.
當操作者欲藉由該內孔刀具202進行該工件 201的搪孔時，能先將該擋止器63的該擋止銷632退縮遠離該限位件631，以及將該嚙合器432的該嚙合件434利用該氣壓缸433遠離該齒排431，接著便能藉由該下移動單元4及該上移動單元6使該內孔刀具202沿該第一方向L1及該第二方向L2移動，進而對於該工件201進行搪孔加工。When the operator wants to perform the workpiece by the bore tool 202 When the boring of the stopper 632 is retracted away from the limiting member 631, the engaging member 434 of the engaging member 432 is separated from the tooth row 431 by the pneumatic cylinder 433. Then, the lower hole moving tool 4 and the upper moving unit 6 can move the inner hole cutter 202 in the first direction L1 and the second direction L2, thereby performing the boring processing on the workpiece 201.
通過上述結構組成，可以將本新型的優點與功效歸納如下：Through the above structural composition, the advantages and effects of the present invention can be summarized as follows:
一、藉由沿該第一方向L1設置該下導螺桿421，及沿該第二方向L2設置該上導螺桿621，能有效降低背隙，進而提高該尾座本體5於定位時的精準度。此外，該下導螺桿421亦能抵抗該工件201於加工時所產生的軸向推力，藉此達到較佳的定位精度。1. By providing the lower lead screw 421 along the first direction L1 and the upper lead screw 621 along the second direction L2, the backlash can be effectively reduced, thereby improving the accuracy of the tailstock body 5 during positioning. . In addition, the lower lead screw 421 can also resist the axial thrust generated by the workpiece 201 during processing, thereby achieving better positioning accuracy.
二、藉由設置該下剎車模組43，能利用該等嚙合器432嚙合於該齒排431，進而將該移動基座3限位固定於該機架21上，藉此抵抗該工件201於加工時所產生的軸向推力，並達到較佳的定位精度。By providing the lower brake module 43, the meshing member 432 can be engaged with the tooth row 431 to fix the moving base 3 to the frame 21, thereby resisting the workpiece 201. The axial thrust generated during machining and the better positioning accuracy.
三、藉由設置該夾緊件415，能調整該等第一下滑動件411夾持於該等第二下滑動件412的力道，進而改變任二相鄰面之間的間隙，藉此達到優異的移載精度。3. By providing the clamping member 415, the force of the first lower sliding member 411 being clamped on the second lower sliding members 412 can be adjusted, thereby changing the gap between any two adjacent surfaces, thereby achieving Excellent transfer accuracy.
綜上所述，藉由設置該下導螺桿421及該上導螺桿621，能有效降低背隙，進而提高定位的精準度，故確實能達成本新型之目的。In summary, by providing the lower lead screw 421 and the upper lead screw 621, the backlash can be effectively reduced, thereby improving the positioning accuracy, and thus the object of the present invention can be achieved.
惟以上所述者，僅為本新型之較佳實施例而已，當不能以此限定本新型實施之範圍，即大凡依本新型申請專利範圍及專利說明書內容所作之簡單的等效變化與修飾，皆仍屬本新型專利涵蓋之範圍內。However, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the present patent application and the contents of the patent specification, All remain within the scope of this new patent.
L2‧‧‧第二方向L2‧‧‧ second direction
21‧‧‧機架21‧‧‧Rack
24‧‧‧尾座裝置24‧‧‧Tailstock device
3‧‧‧移動基座3‧‧‧Mobile base
4‧‧‧下移動單元4‧‧‧Mobile unit
41‧‧‧下導引模組41‧‧‧Lower guide module
411‧‧‧第一下滑動件411‧‧‧First lower slide
412‧‧‧第二下滑動件412‧‧‧Second lower slide
413‧‧‧夾緊器413‧‧‧Clamps
414‧‧‧固定塊414‧‧‧Fixed block
415‧‧‧夾緊件415‧‧‧Clamping parts
416‧‧‧滾輪416‧‧‧Roller
417‧‧‧調整螺絲417‧‧‧Adjustment screw
42‧‧‧下傳動模組42‧‧‧lower drive module
421‧‧‧下導螺桿421‧‧‧ lower lead screw
43‧‧‧下剎車模組43‧‧‧Behind brake module
431‧‧‧齒排431‧‧‧ teeth row
432‧‧‧嚙合器432‧‧‧Meshing device
433‧‧‧氣壓缸433‧‧‧ pneumatic cylinder
434‧‧‧嚙合件434‧‧‧Meshing parts
5‧‧‧尾座本體5‧‧‧Tailstock body
51‧‧‧頂心51‧‧‧Top
52‧‧‧刀具安裝孔52‧‧‧Tool mounting hole
6‧‧‧上移動單元6‧‧‧Upper mobile unit
61‧‧‧上導引模組61‧‧‧Upper Guide Module
611‧‧‧第一上滑動件611‧‧‧First upper slide
612‧‧‧第二上滑動件612‧‧‧Second upper slide
62‧‧‧上傳動模組62‧‧‧Upper drive module
622‧‧‧馬達622‧‧‧Motor
623‧‧‧主動輪623‧‧‧Drive wheel
624‧‧‧從動輪624‧‧‧ driven wheel
625‧‧‧連動件625‧‧‧ linkages
63‧‧‧擋止器63‧‧‧stops
631‧‧‧限位件631‧‧‧Limited parts
632‧‧‧擋止銷632‧‧ ‧ stop pin
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103217045U TWM493422U (en) | 2014-09-25 | 2014-09-25 | Tailstock device of machine tools for deep hole processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103217045U TWM493422U (en) | 2014-09-25 | 2014-09-25 | Tailstock device of machine tools for deep hole processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| TWM493422U true TWM493422U (en) | 2015-01-11 |
Family
ID=52783734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW103217045U TWM493422U (en) | 2014-09-25 | 2014-09-25 | Tailstock device of machine tools for deep hole processing |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWM493422U (en) |
-
2014
- 2014-09-25 TW TW103217045U patent/TWM493422U/en unknown
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