Hydraulic safety slip

Abstract

The utility model belongs to the technical field of well drilling, and particularly relates to a hydraulic safety slip. The device comprises a shell, a clamping mechanism and a tightening mechanism, and through holes are formed in the opposite faces of the shell in a penetrating mode; the clamping mechanism comprises a plurality of clamping seats arranged around the through hole and a first driving device, the clamping seats are slidably connected into the shell through rails, the driving device is used for driving the clamping seats to be close to or separated from each other, a plurality of first sliding grooves are formed in the inner side faces of the clamping seats in the circumferential direction, and middle blocks capable of rotating in the circumferential direction are installed in the first sliding grooves. A plurality of second sliding grooves are formed in the inner side face of the middle block in the circumferential direction of the middle block, and clamping pieces capable of rotating in the circumferential direction are installed in the second sliding grooves. The tightening mechanism comprises a pull rod piece and a second driving device, the pull rod piece is connected between the two adjacent clamping seats in a penetrating mode, and the second driving device is used for driving the pull rod piece to tension the clamping seats. The slip is used for solving the problem that a tooth plate of a conventional slip is troublesome to replace.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of drilling, specifically relates to a hydraulic safety slip. 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 is in the shape of a cone, and the clamping of the drill tool is realized through the 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 realized.

[0004] However, when the slip clamps the drill collar, the conventional slip embraces the outer periphery of the drill collar. If the drill collar is light, the radial clamping force is low and slipping is easy to occur. At present, the slip is usually driven by the oil cylinder to generate pressure, and the oil cylinder system has internal leakage. If the internal leakage of the hydraulic system occurs, 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 the tooth plate. When facing different sizes of drill tools, the jaw and the tooth plate are usually replaced to cope with it, which is more troublesome and complex to operate. UTILITY MODEL CONTENTS

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

[0006] The technical solution of the utility model to solve the above technical problems is as follows: a hydraulic safety slip, comprising:

[0007] A shell is provided with a through hole on the opposite surface;

[0008] A clamping mechanism is provided in the shell, the clamping mechanism comprises a plurality of clamping seats and a first driving device arranged around the through hole, the clamping seat is connected to the shell through a track sliding connection, the driving device is used for driving a plurality of clamping seats to close or separate, the inner side of the clamping seat is provided with a plurality of first sliding grooves along the circumferential direction, the first sliding groove is provided with a middle block which can rotate along the circumferential direction, the inner side of the middle block is provided with a plurality of second sliding grooves along the circumferential direction, the second sliding groove is provided with a clamping piece which can rotate along the circumferential direction, and the clamping piece is 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 seat.

[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. When the drilling tool is light, the drilling tool can also be clamped well. The middle block is arranged to rotate on the inner side of the clamping seat, and the clamping piece is arranged to rotate on the inner side of the middle block, thereby forming a multi-layer clamping structure. The clamping piece can be adaptively clamped on the peripheral surface of the drilling tool. When clamping drilling tools of different sizes, the middle block and the clamping piece can rotate to ensure that they are tightly clamped on the surface of the drilling tool, thereby avoiding frequent replacement of the jaw plate. 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] In an embodiment, further comprising a plurality of linkage mechanisms corresponding to the tightening mechanism, the linkage mechanism comprising:

[0013] Two racks, the racks being arranged parallel to the tightening direction of the tightening mechanism, and the two racks being connected with two adjacent clamping seats respectively;

[0014] A linkage gear rotatably connected between the two racks, the linkage gear being meshingly connected with the racks.

[0015] A centering support, the center of rotation of the centering support corresponding to the center of the through hole, and the linkage gear being rotatably connected to the centering support.

[0016] The linkage gear is kept in a centered position by the centering support in the linkage mechanism, and the linkage gear is meshingly connected with the two racks at the same time. The two racks are fixed on the two clamping seats, and can move left and right at the same time when the clamping seats are close or separated, thereby keeping the clamping seats symmetrically open and closed at the same time, and realizing centered clamping.

[0017] In an embodiment, the first sliding groove is a first arc-shaped surface matched with the outer side surface of the middle block, and the second sliding groove is a second arc-shaped surface matched with the outer side surface of the clamping piece. The curvature of the first arc-shaped surface is smaller than the curvature of the second arc-shaped surface.

[0018] The gradually changing curvature design ensures that the clamping piece closer to the drilling tool has better flexibility, and the clamping piece on the middle block can also deflect in a larger range, so that the overall applicable size range is wider.

[0019] 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.

[0020] 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 piece is arranged with the clamping teeth on the inner side.

[0021] In an embodiment, the pull rod comprises:

[0022] 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.

[0023] 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 be close to each other.

[0024] 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 formed with an external gear in meshing connection with the driven wheel.

[0025] 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 rotationally connected with the clamping seat, and the rotating shaft is parallel to the axis of the through hole.

[0026] 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.

[0027] In an embodiment, the pull rod and the rack are arranged parallel to the extension direction of the first driving device, and the rack is installed on the connecting part.

[0028] The one or more technical solutions provided in the embodiments have at least the following technical effects or advantages:

[0029] 1. The radial force generated by the first driving device is used to shrink the clamping seat inward, thereby clamping the drilling tool, and avoiding the slipping phenomenon when the drilling tool is light.

[0030] 2. The middle block is rotationally connected with the clamping seat, the inner side of the middle block is rotationally connected with the clamping piece, and the self-adapting rotation structure of the middle block and the clamping piece is used to adapt to drilling columns of various diameters, and the frequent replacement of the jaw and the tooth plate is not needed.

[0031] 3. In order 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, and the two clamping bases are locked again under the premise of the first driving device tightening, so that the safety clamp is not needed to be installed.

[0032] 4. The rack is connected with the clamping base, 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 utilized, and the left and right moving clamping bases can be symmetrically opened and closed with the well mouth center. BRIEF DESCRIPTION OF DRAWINGS

[0033] 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 specific embodiments or the prior art description will be briefly introduced as follows. 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.

[0034] Figure 1 It is a front view structural schematic diagram of the present application.

[0035] Figure 2 It is a top view structural schematic diagram of the present application.

[0036] Figure 3 It is a side view structural schematic diagram of the present application.

[0037] Figure 4 It is Figure 2 It is an enlarged structural schematic diagram of A in the middle.

[0038] Reference signs:

[0039] 1, base; 2, through hole; 3, clamping mechanism; 4, tightening mechanism; 5, linkage mechanism;

[0040] 301, clamping base; 3011, clamping part; 3012, connecting part; 3013, clamping space;

[0041] 302, first driving device; 303, first sliding groove; 304, intermediate block; 305, second sliding groove; 306, clamping piece;

[0042] 401, pull rod piece; 4011, pull rod; 4012, locking nut; 4013, external gear;

[0043] 402, second driving device; 4021, driving motor; 4022, driving wheel; 4023, driven wheel;

[0044] 501, rack; 502, linkage gear; 503, centering support;

[0045] 6, first arc-shaped hole; 7, first limit pin; 8, second arc-shaped hole; 9, second limit pin; 10, first cover plate; 11, second cover plate; 13, jaw; 14, rotating shaft; 15, track. DETAILED DESCRIPTION

[0046] The technical solutions of the utility model will be described below in detail in conjunction with the drawings. The following examples are only used to make the technical solutions of the utility model clearer, and therefore only serve as examples, but cannot limit the protection scope of the utility model.

[0047] 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 meanings understood by the technical personnel in the field to which the utility model belongs.

[0048] In the description of the present application, it should be understood that the orientations or position relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like are based on the orientations or position relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0049] In addition, the terms "first", "second" and the like are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0050] In the present application, unless otherwise specifically specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication or interaction relationship between two elements. For ordinary skilled personnel in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0051] As Figure 1 shown, the hydraulic safety slip provided by the utility model comprises a shell, a clamping mechanism 3 and a tightening mechanism.

[0052] The through hole 2 is arranged through opposite surfaces of the shell, and the through hole 2 is arranged at the center of the shell and used for passing through a drilling tool. The shell comprises a base 1 and a shell cover arranged on the base 1. The shell cover is not shown in the figure. The base 1 is used for bearing a clamping mechanism 3 and a tightening mechanism and the like. The shell cover plays a protection role. The top of the shell is provided with a plurality of lifting lugs.

[0053] The clamping mechanism 3 is arranged in the shell. The clamping mechanism 3 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 each other or separated. The first driving device 302 can drive the clamping seats 301 to slide on the base 1 to realize closing or separation.

[0054] Specifically, the bottom of the clamping seat 301 is slidably provided with a track 15. The track 15 is fixed on the base 1 and faces the central through hole 2. The track 15 controls the moving direction of the clamping seat 301, controls the movement towards or away from the central through hole 2.

[0055] The clamping seat 301 is arranged as at least two. A plurality of clamping seats 301 are closed around the through hole 2 to clamp the drilling tool passing through the through hole 2. In the embodiment, considering the cost and convenient control, the clamping seat 301 is arranged as two to form a left-right opening and closing structure. The first driving device 302 drives the clamping seat 301 arranged around the through hole 2 to close to provide a radial clamping force. When the drilling tool is lighter, the drilling tool can also be clamped better.

[0056] The inner side of the clamping seat 301 is provided with a plurality of first sliding grooves 303 along the circumferential direction. In the embodiment, the inner side of one clamping seat 301 is provided with two sliding grooves. The first sliding groove 303 is installed with an intermediate block 304 which can rotate along the circumferential direction. 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 is rotating along the circumferential direction around the vertical rotation shaft 14. 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 groove 305 is consistent with that of the first sliding groove 303, which is rotating along the circumferential direction around the vertical rotation shaft 14. The second sliding groove 305 is installed with a clamping piece 306 which can rotate along the circumferential direction. The outer side of the clamping piece 306 is fitted in the second sliding groove 305. The inner side of the clamping piece 306 is used for clamping the circumferential surface of the workpiece passing through the through hole 2. The intermediate block 304 is rotatably arranged in the clamping seat 301. The clamping piece 306 is rotatably arranged in the intermediate block 304 to form a multi-layer clamping structure. The rotation shaft 14 of the intermediate block 304 and the clamping piece 306 is parallel to the axial core line direction of the workpiece and the through hole 2, which can be self-adapted to clamp on the circumferential surface of the drilling tool. When clamping drilling 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 drilling tool, avoiding frequent replacement of the jaw plate.

[0057] The tightening mechanism is arranged corresponding to the clamping mechanism 3, and the tightening mechanism 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, 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.

[0058] 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 are further arranged, wherein the corresponding arrangement is divided into quantity correspondence and position correspondence. The tightening mechanism is provided with two, and the linkage mechanism 5 is provided with two. In the position, the tightening mechanism and the linkage mechanism 5 are arranged on both sides of the center of the clamping seat 301, and the clamping seat 301 is stably tightened from both sides.

[0059] The linkage mechanism 5 comprises two racks 501, a linkage gear 502 and a centering support 503. The racks 501 are arranged parallel to the tightening direction of the tightening mechanism. The two racks 501 are respectively connected with two adjacent clamping seats 301. The linkage gear 502 is rotatably 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 rotatably connected to 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 keep in the centered position by the centering support 503 in the linkage mechanism 5, that is, the rotation center of the linkage gear 502 keeps aligned with the center of the through hole 2. The linkage gear 502 is in meshing connection with the two racks 501. The two racks 501 are fixed on the two clamping seats 301 and can move left and right simultaneously when the clamping seats 301 approach or separate, so as to keep the clamping seats 301 symmetrically open and close, realize the centered clamping, and prevent the two clamping seats 301 from moving while the other clamping seat 301 remains stationary due to uneven force during movement. Instead, the two clamping seats 301 move while keeping centered by the linkage of the racks 501 and the linkage gear 502.

[0060] 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.

[0061] Specifically, as shown in Figure 2 、 4 , Figure 4 the upper half is a schematic diagram of the 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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

[0066] 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 a 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.

[0067] An 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 the 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 a workpiece surface, the contact area is increased, and the friction force is increased.

[0068] In the embodiment, the pull rod piece 401 includes a pull rod 4011 and a locking nut 4012.

[0069] ​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 the locking nut 4012 is screwed on 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.

[0070] 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 driving force of 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.

[0071] 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.

[0072] Specifically, a long external tooth surface is formed on the outer periphery of the driven wheel 4023 along the axial direction, 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.

[0073] 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, that is, the rotating shafts 14 are parallel to the axis core line of the through hole 2. 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, and the two ends of the first driving device 302 are connected with the clamping seat 301 through the rotating shafts 14, which has the same effect, and the first driving device 302 can be realized by a hydraulic cylinder.

[0074] 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, 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, 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, the opening and closing surface is a parting surface contacted 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, the first driving device 302 is horizontally arranged, and the axial direction of the first driving device 302 is 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, and 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 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, the connecting parts 3012 on both sides transmit the linkage centering effect of the rack 501, optimize the space, and reduce the overall volume.

[0075] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but 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 hydraulic safety slip characterized in that, The utility model relates to a clamping device for workpiece, comprising: a shell, through holes are arranged on opposite surfaces of the shell; a clamping mechanism arranged in the shell, the clamping mechanism comprises a plurality of clamping seats arranged around the through hole and a first driving device, the clamping seat is connected in the shell through track sliding, the driving device is used for driving a plurality of the clamping seat to close or separate, the inner side of the clamping seat is provided with a plurality of first sliding grooves along the circumferential direction, the first sliding groove is installed with the intermediate block rotatable along the circumferential direction, the inner side of the intermediate block is provided with a plurality of second sliding grooves along the circumferential direction, the second sliding groove is installed with the clamping piece rotatable along the circumferential direction, and the clamping piece is used to clamp the circumferential surface of the workpiece passing through the through hole; a plurality of tightening mechanisms comprising a pull rod and a second driving device, the pull rod is connected between adjacent two clamping seats, and the second driving device is used to drive the pull rod to tighten the clamping seat.

2. The hydraulic safety slip according to claim 1, wherein, Further comprising a plurality of linkage mechanisms corresponding to the tightening mechanism, the linkage mechanism comprises: two racks, the rack is arranged in parallel with the tightening direction of the tightening mechanism, and two racks are connected with adjacent two clamping seats respectively; linkage gear, rotationally connected between two racks, 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.

3. The hydraulic slip of claim 1, wherein, The first sliding groove is a first arc surface matched with the outer side of the intermediate block, the second sliding groove is a second arc surface matched with the outer side of the clamping piece, and the curvature of the first arc surface is smaller than the curvature of the second arc surface.

4. The hydraulic slip of claim 3, wherein, The intermediate block is provided with one of a first arc hole and a first limiting pin matched with each other at both ends, and the other is fixedly arranged;The clamping piece is provided with one of a second arc hole and a second limiting pin matched with each other at both ends, and the other is fixedly arranged.

5. The hydraulic slip of claim 4, wherein, The first cover plate corresponding to the first arc hole is arranged on the clamping seat at both ends of the intermediate block, and the second cover plate corresponding to the second arc hole is arranged on the intermediate block at both ends of the clamping piece;The inner side of the clamping piece is an arc surface, and the inner side of the clamping piece is arrayed with a plurality of jaws.

6. The hydraulic slip of claim 1, wherein, The pull rod comprises: a pull rod, one end of the pull rod is connected to a clamping seat, and the other end of the pull rod penetrates through another adjacent clamping seat; a locking nut, the locking nut abuts 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 adjacent two clamping seats to close.

7. The hydraulic slip of claim 6, 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 meshed with the driving wheel and the driven wheel, and the outer periphery of the locking nut is formed with an external gear meshed with the driven wheel.

8. The hydraulic slip of claim 6, wherein, 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 rotating shafts, the rotating shafts are rotationally connected with the clamping seat, and the rotating shafts are parallel to the axis of the through hole.

9. The hydraulic slip of claim 2, wherein, The clamping seat comprises a clamping part and connecting parts 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 a direction perpendicular to an opening and closing surface of the clamping seat, and both ends of the first driving device are connected with the connecting parts of the two clamping seats.

10. The hydraulic slip of claim 9, wherein, The pull rod and the rack are arranged parallel to a telescopic direction of the first driving device, and the rack is mounted on the connecting part.

Images