A slip device

Abstract

The present application belongs to the field of drilling technology, and particularly relates to a slip device. The slip device comprises a base, a clamping mechanism and a tightening mechanism, the base is provided with a through hole, the clamping mechanism is arranged on the base, the clamping mechanism comprises a plurality of clamping seats arranged around the through hole, and a first driving device for driving the clamping seats to be close to each other or separated, the inner side of the clamping seat is provided with a plurality of first sliding grooves along the circumferential direction, the first sliding grooves are provided with intermediate blocks which can rotate along the circumferential direction, the inner side of the intermediate blocks is provided with a plurality of second sliding grooves along the circumferential direction, the second sliding grooves are provided with clamping pieces which can rotate along the circumferential direction, and the clamping pieces are used for clamping the circumferential surface of a workpiece passing through the through hole; the tightening mechanism comprises a pull rod and a second driving device, the pull rod is arranged between two adjacent clamping seats, and the second driving device is used for driving the pull rod to tighten the clamping seats. The present application is used for solving the problem that the conventional slip is more troublesome to replace the tooth plate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drilling, and particularly relates to a slip device. BACKGROUND

[0002] The slip is a tool used for clamping and suspending the drill string, casing string or drill collar during the tripping in the drilling process.

[0003] The conventional slip has a conical shape, and the clamping of the drill tool is achieved through wedge and friction engagement. The inner wall of the slip is formed by a plurality of slip pieces, and the surface is embedded with slip teeth. The friction force is generated by the rough surface of the slip teeth in contact with the drill tool to prevent the drill tool from sliding. When the slip is pressed down, the conical structure is tightened in the inner hole of the rotary table, the slip teeth engage the surface of the drill tool, and the clamping is achieved.

[0004] However, when the slip clamps the drill collar, since the drill collar has no coupling, if the drill collar is light, the radial clamping force is low and slipping is easy to occur when the conventional slip embraces the outer periphery of the drill collar. Moreover, the current slip is usually driven by the oil cylinder to generate pressure, and the oil cylinder system has internal leakage. If the pressure in the hydraulic system drops due to internal leakage, the clamping force will decrease, and in severe cases, the entire drill collar will fall into the well. In addition, the inner wall of the current slip is usually a fixed size of the jaw and tooth plate. When facing different sizes of drill tools, the jaw and tooth plate are usually replaced to cope with it, which is more troublesome and complex to operate. SUMMARY

[0005] In view of the deficiencies of the prior art, a slip device is provided to solve the problem of replacing the tooth plate of the conventional slip.

[0006] The technical scheme for solving the above technical problems is as follows: a slip device, comprising:

[0007] a base, a through hole is formed in the base;

[0008] a clamping mechanism arranged on the base, the clamping mechanism comprising a plurality of clamping seats arranged around the through hole, and a first driving device for driving the clamping seats to approach and close or separate, the inner side surface of the clamping seat is provided with a plurality of first sliding grooves along the circumferential direction, the first sliding grooves are installed with intermediate blocks which can rotate along the circumferential direction, the inner side surface of the intermediate blocks is provided with a plurality of second sliding grooves along the circumferential direction, the second sliding grooves are installed with clamping pieces which can rotate along the circumferential direction, and the clamping pieces are used for clamping the circumferential surface of the workpiece passing through the through hole;

[0009] a plurality of tightening mechanisms, comprising a pull rod and a second driving device, the pull rod is connected between two adjacent clamping seats, and the second driving device is used for driving the pull rod to tighten the clamping seats.

[0010] Compared with the prior art, the above technical scheme has the following beneficial effects:

[0011] The first driving device drives the clamping seat arranged around the through hole to close, thereby providing a radial clamping force, and the inner side of the clamping seat is rotationally provided with a middle block, and the inner side of the middle block is rotationally provided with a clamping piece, thereby forming a multi-layer clamping structure, which can be self-adaptively clamped on the peripheral surface of the drilling tool, and the middle block and the clamping piece can rotate when clamping drilling tools of different sizes, so that the drilling tool is tightly clamped on the surface of the drilling tool, and frequent replacement of the jaw plate is avoided; the tightening mechanism is installed, and on the basis of the clamping of the first driving device, the two clamping seats are tightened by the pull rod, thereby providing an additional safety redundancy means and improving safety.

[0012] On the basis of the above technical scheme, the embodiments of the present application can also be improved as follows:

[0013] In an embodiment, further comprising a plurality of linkage mechanisms corresponding to the tightening mechanism, the linkage mechanism comprising:

[0014] Two racks, the racks being arranged parallel to the tightening direction of the tightening mechanism, and the two racks being respectively connected with two adjacent clamping seats;

[0015] A linkage gear rotationally connected between the two racks, and the linkage gear being meshingly connected with the racks.

[0016] A centering support, the center of rotation of the centering support corresponding to the center of the through hole, and the linkage gear being rotationally connected to the centering support.

[0017] The linkage gear is kept in a centered position by the centering support in the linkage mechanism, and the linkage gear is simultaneously meshingly connected with the two racks, and the two racks are fixed on the two clamping seats, so that the clamping seats can be simultaneously moved left and right when the clamping seats are close to or separated from each other, thereby keeping the clamping seats symmetrically opened and closed in synchronous movement, and achieving centered clamping.

[0018] In an embodiment, the first sliding groove is a first arc-shaped surface matched with the outer side surface of the middle block, the second sliding groove is a second arc-shaped surface matched with the outer side surface of the clamping piece, and the curvature of the first arc-shaped surface is smaller than the curvature of the second arc-shaped surface.

[0019] The gradually changed curvature design ensures that the clamping pieces closer to the drilling tool have better flexibility, and the clamping pieces on the middle block can be deflected in a larger range at the same time, so that the overall applicable size range is wider.

[0020] In an embodiment, one of a first arc-shaped hole and a first limiting pin matched with each other is arranged at both ends of the middle block, and the other is fixedly arranged; one of a second arc-shaped hole and a second limiting pin matched with each other is arranged at both ends of the clamping piece, and the other is fixedly arranged.

[0021] In an embodiment, the first cover plate corresponding to the first arc-shaped hole is arranged on the clamping seat at both ends of the middle block, and the second cover plate corresponding to the second arc-shaped hole is arranged on the middle block at both ends of the clamping piece; the inner side of the clamping piece is an arc surface, and the clamping teeth are arranged on the inner side of the clamping piece.

[0022] In an embodiment, the pull rod comprises:

[0023] A pull rod is connected to one of the clamping seats at one end and penetrates through the other adjacent clamping seat at the other end;

[0024] A locking nut is arranged on the other adjacent clamping seat and is screwed on the outer periphery of the pull rod, and the locking nut is in transmission connection with the output end of the second driving device to drive the adjacent two clamping seats to approach.

[0025] In an embodiment, the second driving device comprises a driving motor, a driving wheel and a driven wheel, the output end of the driving motor is sequentially connected with the driving wheel and the driven wheel, and the outer periphery of the locking nut is provided with an external gear in meshing connection with the driven wheel.

[0026] In an embodiment, the end of the pull rod connected with the clamping seat and the two ends of the first driving device are both vertically connected with a rotating shaft, the rotating shaft is in rotating connection with the clamping seat, and the rotating shaft is perpendicular to the surface of the base.

[0027] In an embodiment, the clamping seat comprises a clamping part and a connecting part arranged on both sides of the clamping part, the clamping part is folded to form a clamping space coaxial with the through hole, the first driving device is arranged along the direction perpendicular to the opening and closing surface of the clamping seat, and the two ends of the first driving device are connected with the connecting parts of the two clamping seats.

[0028] In an embodiment, the pull rod and the rack are arranged in parallel to the extension direction of the first driving device, and the rack is installed on the connecting part.

[0029] The one or more technical solutions provided in the embodiments have at least the following technical effects or advantages:

[0030] 1. The radial force generated by the first driving device is used to shrink the clamping seat inward, thereby clamping the drilling tool, and the slipping phenomenon of the drilling tool when it is light is avoided.

[0031] 2. The middle block is in rotating connection with the clamping seat, the clamping piece is in rotating connection with the inner side of the middle block, the self-adapting rotating structure of the middle block and the clamping piece is used to adapt to drilling columns of various diameters, and the tongs and the jaw plate do not need to be frequently replaced.

[0032] 3. To avoid the pressure drop caused by the hydraulic system leakage, the second driving device is used to drive the locking nut to rotate, drive the screw rod to lock, and play the role of safety clamp. Under the premise of tightening the first driving device, the two clamping seats are locked, and there is no need to install the safety clamp again.

[0033] 4. The rack is connected with the clamping seat, the linkage gear is meshed and connected with the two racks, the linkage gear is fixed through the centering support, the gear and rack transmission characteristics are used, and the left and right moving clamping seats can be symmetrically opened and closed with the well mouth center. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0035] Figure 1 It is a front view structural schematic diagram of the present application.

[0036] Figure 2 It is a top view structural schematic diagram of the present application.

[0037] Figure 3 It is a side view structural schematic diagram of the present application.

[0038] Figure 4 It is Figure 2 It is an enlarged structural schematic diagram of A in the middle.

[0039] Reference signs:

[0040] 1. Base; 2. Through hole; 3. Clamping mechanism; 4. Tightening mechanism; 5. Linkage mechanism;

[0041] 301. Clamping seat; 3011. Clamping part; 3012. Connecting part; 3013. Clamping space;

[0042] 302. First driving device; 303. First sliding groove; 304. Intermediate block; 305. Second sliding groove; 306. Clamping piece;

[0043] 401. Pull rod piece; 4011. Pull rod; 4012. Locking nut; 4013. External gear;

[0044] 402. Second driving device; 4021. Driving motor; 4022. Driving wheel; 4023. Driven wheel;

[0045] 501. Rack; 502. Linkage gear; 503. Centering support;

[0046] 6, first arc-shaped hole; 7, first limiting pin; 8, second arc-shaped hole; 9, second limiting pin; 10, first cover plate; 11, second cover plate; 13, jaw; 14, rotating shaft; 15, track. DETAILED DESCRIPTION

[0047] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0048] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by the skilled person in the field to which the present application belongs.

[0049] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0051] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] As Figures 1-4 shown, the slip device provided by the present application comprises a base 1, a clamping mechanism 3 and a tightening mechanism 4.

[0053] The base 1 is provided with a through hole 2 at the center of the base 1, which is used to pass through a drilling tool, and the base 1 is used to carry the clamping mechanism 3 and the tightening mechanism 4 and the like.

[0054] The clamping mechanism 3 is arranged on the base 1, and comprises a plurality of clamping seats 301 arranged around the through hole 2 and a first driving device 302 for driving the clamping seats 301 to be close to or separated from each other, the first driving device 302 being capable of driving the clamping seats 301 to slide on the base 1 to realize the closing or separation;

[0055] Specifically, the bottom of the clamping seat 301 is slidably provided with a track 15 fixed on the base 1, the track 15 being directed towards the central through hole 2 to control the moving direction of the clamping seat 301, and control the movement towards or away from the central through hole 2.

[0056] The clamping seat 301 is arranged in at least two, and a plurality of clamping seats 301 are arranged around the through hole 2 to clamp the drill tool passing through the through hole 2. In the embodiment, two clamping seats 301 are arranged to form a left-right opening and closing structure from the perspective of cost and convenient control, and the first driving device 302 is used to drive the clamping seats 301 arranged around the through hole 2 to close to provide a radial clamping force, which can also clamp the drill tool well when the drill tool is light.

[0057] The inner side of the clamping seat 301 is provided with a plurality of first sliding grooves 303 along the circumferential direction, and the first sliding grooves 303 are arranged in multiple along the circumferential direction. In the embodiment, two sliding grooves are arranged on the inner side of one clamping seat 301. The intermediate block 304 rotatable along the circumferential direction is installed in the first sliding groove 303, the outer side of the intermediate block 304 is fitted in the first sliding groove 303 and can slide in the first sliding groove 303, the sliding direction being rotation along the circumferential direction around the vertical rotation axis 14 thereof, the inner side of the intermediate block 304 is provided with a plurality of second sliding grooves 305 along the circumferential direction, the sliding direction of the second sliding grooves 305 being consistent with that of the first sliding grooves 303, both being rotation along the circumferential direction around the vertical rotation axis 14 thereof, and the clamping piece 306 rotatable along the circumferential direction is installed in the second sliding groove 305, the outer side of the clamping piece 306 being fitted in the second sliding groove 305, the inner side of the clamping piece 306 being used to clamp the circumferential surface of the workpiece passing through the through hole 2. The intermediate block 304 is rotatably arranged in the inner side of the clamping seat 301, and the clamping piece 306 is rotatably arranged in the inner side of the intermediate block 304 to form a multi-layer clamping structure. The rotation axes 14 of the intermediate block 304 and the clamping piece 306 are parallel to the axial core line direction of the workpiece and the through hole 2, and can be self-adaptively clamped on the circumferential surface of the drill tool. When clamping drill tools of different sizes, the intermediate block 304 and the clamping piece 306 can rotate to ensure that they are tightly clamped on the surface of the drill tool, avoiding frequent replacement of the jaw plate.

[0058] The tightening mechanism 4 is arranged corresponding to the clamping mechanism 3, the tightening mechanism 4 comprises a pull rod 401 and a second driving device 402, the pull rod 401 is arranged between two adjacent clamping seats 301, and the second driving device 402 is used for driving the pull rod 401 to tighten the clamping seat 301. By installing the tightening mechanism 4, the two clamping seats 301 are tightened by the pull rod 401 on the basis of being clamped by the first driving device 302, and the safety redundancy means is additionally provided, and the safety is improved.

[0059] In order to ensure that the two clamping seats 301 move synchronously when approaching or separating from each other, a plurality of linkage mechanisms 5 corresponding to the tightening mechanism 4 are further arranged, wherein the corresponding arrangement is divided into quantity correspondence and position correspondence, the tightening mechanism 4 is arranged in two, the linkage mechanism 5 is arranged in two, and the tightening mechanism 4 and the linkage mechanism 5 are arranged on both sides of the center of the clamping seat 301, so that the clamping seat 301 is stably tightened from both sides.

[0060] The linkage mechanism 5 comprises two racks 501, a linkage gear 502 and a centering support 503, the racks 501 are arranged in parallel to the tightening direction of the tightening mechanism 4, the two racks 501 are connected with two adjacent clamping seats 301 respectively, the linkage gear 502 is rotationally connected between the two racks 501, the linkage gear 502 is in meshing connection with the racks 501, the rotation center of the centering support 503 is arranged corresponding to the center of the through hole 2, the linkage gear 502 is rotationally connected on the centering support 503, the rotation center of the linkage gear 502 corresponds to the center of the through hole 2, the centering support 503 is fixed on the base 1 and remains stable, the linkage gear 502 is limited to remain in the centered position by the centering support 503 in the linkage mechanism 5, that is, the rotation center of the linkage gear 502 remains aligned with the center of the through hole 2, the linkage gear 502 is in meshing connection with the two racks 501 at the same time, the two racks 501 are fixed on the two clamping seats 301, and the two clamping seats 301 can move left and right at the same time when the clamping seats 301 approach or separate, so that the clamping seats 301 move synchronously and symmetrically, the clamping is centered, and the two clamping seats 301 will not be in a state that one clamping seat 301 moves and the other clamping seat 301 does not move due to uneven force during movement, but the two clamping seats 301 move and remain centered by the connection of the racks 501 and the linkage gear 502.

[0061] Specifically, the first sliding groove 303 is a first arc-shaped surface matched with the outer side surface of the intermediate block 304, and the second sliding groove 305 is a second arc-shaped surface matched with the outer side surface of the clamping piece 306. The arc-shaped surface is arranged vertically along the core axis and is kept parallel to the vertical axis core line of the through hole 2. The vertical arc-shaped surface can ensure that the intermediate block 304 and the clamping piece 306 fit therein rotate along the circumference, forming self-adaptive rotation fitting the surface of the workpiece. At the same time, the curvature of the first arc-shaped surface is smaller than that of the second arc-shaped surface. By using the design of gradually changing curvature, the clamping piece 306 close to the workpiece is connected with the intermediate block 304 through the second arc-shaped surface. The higher curvature ensures that the clamping piece 306 close to the drill has better flexibility, and the clamping piece 306 on the intermediate block 304 can deflect in a larger range at the same time, so that the overall applicable size range is wider, and more clamping pieces 306 are driven to rotate.

[0062] Specifically, as shown in Figure 2 、 4 , Figure 4 The upper half of the middle part is a schematic diagram of an omitted cover plate structure. The circumferential rotation of the intermediate block 304 and the clamping piece 306 is realized through the arc-shaped matching arc-shaped hole and the limiting pin. One of the first arc-shaped hole 6 and the first limiting pin 7 matched with each other is arranged at both ends of the intermediate block 304, and the other is fixedly arranged. One of the second arc-shaped hole 8 and the second limiting pin 9 matched with each other is arranged at both ends of the clamping piece 306, and the other is fixedly arranged.

[0063] One of them is to arrange the limiting pin at both ends of the intermediate block 304 and the clamping piece 306. Specifically, the first limiting pin 7 is arranged at both ends of the intermediate block 304. The first limiting plate is arranged at both ends of the intermediate block 304. The first arc-shaped hole 6 matched with the first limiting pin 7 is arranged on the first limiting plate. The cooperation of the first limiting pin 7 and the first arc-shaped hole 6 can limit the circumferential rotation of the intermediate block 304 along the extension direction of the first arc-shaped hole 6. The second limiting pin 9 is arranged at both ends of the clamping piece 306. The second limiting plate is arranged at both ends of the clamping piece 306. The second arc-shaped hole 8 matched with the second limiting pin 9 is arranged on the second limiting plate. The cooperation of the second limiting pin 9 and the second arc-shaped hole 8 can limit the circumferential rotation of the clamping piece 306 along the extension direction of the second arc-shaped hole 8.

[0064] Secondly, the arc-shaped holes are arranged at both ends of the intermediate block 304 and the clamping piece 306, specifically, first arc-shaped holes 6 are arranged at both ends of the intermediate block 304, first limiting pins 7 are arranged in the first arc-shaped holes 6 in a matched mode, end portions of the first limiting pins 7 are fixed through limiting plates or other limiting blocks, and the circumferential rotation of the intermediate block 304 is realized; second arc-shaped holes 8 are arranged at both ends of the clamping piece 306, second limiting pins 9 are arranged in the second arc-shaped holes 8 in a matched mode, end portions of the second limiting pins 9 are fixed through limiting plates or other limiting blocks, and the circumferential rotation of the clamping piece 306 is realized.

[0065] In order to ensure that the limiting pins in the arc-shaped holes rotate smoothly, first cover plates 10 corresponding to the first arc-shaped holes 6 are arranged at both ends of the intermediate block 304 on the clamping seat 301, when the first arc-shaped holes 6 are arranged at both ends of the intermediate block 304, the first limiting pins 7 are fixedly arranged through the first cover plates 10, when the first limiting pins 7 are arranged at both ends of the intermediate block 304, the first cover plates 10 replace the first limiting pins, first arc-shaped holes 6 matched with the first limiting pins 7 are arranged on the first cover plates 10, and the first arc-shaped holes 6 can be arranged in blind holes at bottoms of the first cover plates 10.

[0066] Second cover plates 11 corresponding to the second arc-shaped holes 8 are arranged at both ends of the clamping piece 306 on the intermediate block 304, when the second arc-shaped holes 8 are arranged at both ends of the clamping piece 306, the second limiting pins 9 are fixedly arranged through the second cover plates 11, the second limiting pins 9 pass through the second cover plates 11 and are matched with the second arc-shaped holes 8, when the second limiting pins 9 are arranged at both ends of the clamping piece 306, the second arc-shaped holes 8 are arranged on the second cover plates 11, in the embodiment, in order to facilitate the arrangement of the arc-shaped holes at both ends of the intermediate block 304 and the clamping piece 306, as shown in the figure. Figure 4

[0067] In addition, the arc-shaped holes are covered through the cover plates, foreign matters are prevented from entering the arc-shaped holes, and the second cover plates 11 are formed with avoiding grooves on one side close to the first cover plates 10, so that the second cover plates 11 do not interfere with the first cover plates 10 when the second cover plates 11 rotate with the intermediate block 304.

[0068] The inner side surface of the clamping piece 306 is an arc surface, and pliers teeth 13 are arranged on the inner side surface of the clamping piece 306 in an array mode, a plurality of rows of pliers teeth 13 are arranged on the inner side arc surface of the clamping piece 306, the clamping piece 306 can be better attached to the surface of a workpiece, the contact area is increased, and the friction force is increased.

[0069] In the embodiment, the pull rod piece 401 includes a pull rod 4011 and a locking nut 4012.

[0070] ​One end of the pull rod 4011 is connected to one of the clamping seats 301, and the other end penetrates through the other adjacent clamping seat 301. The locking nut 4012 abuts against the other adjacent clamping seat 301, and is screwed onto the outer periphery of the pull rod 4011. The locking nut 4012 and the pull rod 4011 are in contact with the two clamping seats 301 respectively, and the locking nut 4012 and the pull rod 4011 are screwed. During the rotation of the pull rod 4011 and the locking nut 4012, the positions of the locking nut 4012 and the pull rod 4011 change, thereby driving the positions of the two clamping seats 301 to change. Therefore, the pull rod 4011 and the locking nut 4012 can further tighten the two clamping seats 301 on the basis of the tightening of the first driving device 302.

[0071] The locking nut 4012 is in transmission connection with the output end of the second driving device 402, and is used to drive the adjacent two clamping seats 301 to approach each other. The second driving device 402 drives the locking nut 4012 to move back and forth on the pull rod 4011, thereby tightening or loosening the two clamping seats 301.

[0072] Specifically, as shown in Figure 2 , 3 The second driving device 402 includes a driving motor 4021, a driving wheel 4022 and a driven wheel 4023. The driving motor 4021 is fixed on the base 1. The output end of the driving motor 4021 is in meshing connection with the driving wheel 4022 and the driven wheel 4023 in sequence. Specifically, the driving wheel 4022 is connected to the output shaft of the driving motor 4021, and the driven wheel 4023 is in meshing connection with the driving wheel 4022. The driven wheel 4023 is arranged on the base 1 through a support frame, and can rotate freely. An external gear 4013 is formed on the outer periphery of the locking nut 4012, and is in meshing connection with the driven wheel 4023. In turn, the driving force is transmitted to the locking nut 4012 through the driving wheel 4022 and the driven wheel 4023.

[0073] Specifically, a long external tooth surface is formed on the outer periphery of the driven wheel 4023 along the axial direction of the driven wheel 4023. That is, the axial length range of the driven wheel 4023 covers the movement range of the locking nut 4012. When the position of the locking nut 4012 changes during the tightening process, the locking nut 4012 can move along the axial direction, and can be in meshing connection with the driven wheel 4023 at any time.

[0074] To ensure that the pull rod 4011 and the first driving device 302 drive the clamping seat 301 to move smoothly, the end of the pull rod 4011 connected with the clamping seat 301 and the two ends of the first driving device 302 are vertically connected with rotating shafts 14, the rotating shafts 14 are rotationally connected with the clamping seat 301, and the rotating shafts 14 are perpendicular to the surface of the base 1. The clamping seat 301 is connected with the pull rod 4011 through the rotating shafts 14, so that when the clamping seat 301 is deflected during reciprocating movement of opening and closing, the rotating shafts 14 are vertically arranged due to being perpendicular to the base 1, the clamping seat 301 can be slightly deflected around the rotating shafts 14, the pull rod 4011 can drive the clamping seat 301 to move smoothly, the two ends of the first driving device 302 are connected with the clamping seat 301 through the rotating shafts 14, and the same effect is achieved. The first driving device 302 can be realized by a hydraulic cylinder.

[0075] In the embodiment, the clamping seat 301 includes a clamping part 3011 and connecting parts 3012 located on both sides of the clamping part 3011, and the clamping part 3011 and the connecting parts 3012 are integrally formed to ensure the overall structural strength. The clamping part 3011 is folded to form a clamping space 3013 coaxial with the through hole 2, and the clamping space 3013 is used to clamp a drilling tool. The first driving device 302 is arranged in a direction perpendicular to the opening and closing surface of the clamping seat 301, and the opening and closing surface is a parting surface when the two clamping seats 301 are folded. In the embodiment, the opening and closing surfaces of the left and right clamping seats 301 are vertical surfaces, and the first driving device 302 is horizontally arranged and has an axial direction perpendicular to the vertical opening and closing surface of the clamping seat 301. Since the connecting parts 3012 are located on both sides of the clamping part 3011, the connecting parts 3012 on both sides are provided with the first driving device 302. The two ends of the first driving device 302 are connected with the connecting parts 3012 of the two clamping seats 301 through the rotating shafts 14. The pull rod 401 and the rack 501 are arranged in parallel with the extension direction of the first driving device 302 to ensure that the left and right clamping seats 301 open and close smoothly. The rack 501 is installed on the connecting part 3012, and the connecting parts 3012 on both sides transmit the linkage centering effect of the rack 501, optimize the space, and reduce the overall volume.

[0076] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A slip device, characterized in that The utility model provides a kind of workpiece clamping device, including: Base, the through hole is opened in the base; Clamping mechanism, is set on the base, the clamping mechanism includes several clamping seats around the through hole is set, and first driving device is driven to the clamping seat close folding or separate, the inner side of the clamping seat is along its circumferential direction and is provided with several first sliding groove, the first sliding groove is mounted with the intermediate block that can rotate along circumferential direction, the inner side of the intermediate block is along its circumferential direction and is provided with several second sliding groove, the second sliding groove is mounted with the clamping piece that can rotate along circumferential direction, the clamping piece is used to clamp the circumferential surface of workpiece passing through the through hole; Several tightening mechanisms, including pull rod piece and second driving device, the pull rod piece is connected between two adjacent clamping seats, and the second driving device is used to drive the pull rod piece to tighten the clamping seat; Wherein, the first sliding groove is the first arc surface matched with the outer side of the intermediate block, the second sliding groove is the second arc surface matched with the outer side of the clamping piece, the curvature of the first arc surface is less than the curvature of the second arc surface, the intermediate block both ends are provided with one of mutually matched first arc hole and first limit pin, the other is fixedly arranged;The clamping piece both ends are provided with one of mutually matched second arc hole and second limit pin, the other is fixedly arranged, the clamping seat is located at the both ends of the intermediate block and is provided with the first cover plate corresponding to the first arc hole, the intermediate block is located at the both ends of the clamping piece and is provided with the second cover plate corresponding to the second arc hole;The inner side of the clamping piece is arc surface, and the inner side of the clamping piece is arranged with the jaw in array; Also including several linkage mechanisms corresponding to the tightening mechanism, the linkage mechanism includes: Two racks, the rack is parallel to the tightening direction of the tightening mechanism and is provided, two rack is connected with two adjacent clamping seat respectively; Linkage gear, rotationally connected between two rack, the linkage gear is meshed with the rack; Centering support, the rotation center of the centering support is arranged corresponding to the center of the through hole, and the linkage gear is rotationally connected to the centering support; The pull rod includes: Pull rod, one end is connected to a clamping seat, the other end penetrates another adjacent clamping seat; Locking nut, the locking nut is abutted on another adjacent clamping seat, the locking nut is screwed on the outer periphery of the pull rod, and the locking nut is drivingly connected with the output end of the second driving device for driving two adjacent clamping seats close; The end of the pull rod connected with the clamping seat and the two ends of the first driving device are both vertically connected with the rotating shaft, the rotating shaft is rotationally connected with the clamping seat, and the rotating shaft is perpendicular to the surface of the base; The clamping seat includes clamping part and connecting part located on both sides of the clamping part, the clamping part is folded to form clamping space coaxial with the through hole, the first driving device is arranged along the direction perpendicular to the opening and closing surface of the clamping seat, and the two ends of the first driving device are connected with the connecting parts of two clamping seats; The pull rod and the rack are parallel to the extension direction of the first driving device, and the rack is installed on the connecting part.

2. The slip device of claim 1, wherein The second driving device comprises a driving motor, a driving wheel and a driven wheel, the output end of the driving motor is sequentially connected with the driving wheel and the driven wheel in engagement, and an external gear engaging with the driven wheel is formed on the outer circumferential surface of the locking nut.

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