Reverse traction device in anchor cable descending hole and descending locking system

Abstract

The invention discloses a reverse traction device in an anchor cable descending hole, and relates to the technical field of anchor cable anchoring in a drill hole, the reverse traction device comprises a base body, a plurality of moving wheels, a plurality of clamping pieces and a stretching and retracting mechanism, the base body is in a linear strip shape, and a fixed pulley is arranged at one end of the base body and is used for being in sliding fit with a steel wire rope; the moving wheels are arranged on the base body; all the clamping pieces are annularly and evenly distributed at intervals with the base body as the axis, the clamping pieces are hinged to the end, away from the fixed pulley, of the base body through rotating shafts, the rotating shafts are perpendicular to the base body, clamping faces are arranged on the sides, away from the rotating shafts, of the clamping pieces and are perpendicular to the axial direction of the rotating shafts, and the clamping faces are smooth arc faces. The distance between the side, close to the fixed pulley, of the clamping face and the rotating shaft is larger than that between the other side and the rotating shaft. The supporting and collecting mechanism is arranged on the base body and can enable all the clamping pieces to rotate synchronously. The problems that when an anchor cable is arranged in a drill hole, the operation efficiency is low, the labor cost is high, jamming is prone to occurring, and the anchor cable is prone to slipping or rapid springback can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of borehole anchor cable anchoring technology, in particular to a reverse pulling device in the anchor cable hole. BACKGROUND

[0002] In the existing rock anchor cable construction, one of the key procedures is to install the prepared anchor cable into the pre-drilled borehole. At present, the industry generally adopts the manual pushing method of pushing the anchor cable from the hole opening to the hole, that is, the construction personnel at the borehole opening cooperate with each other to lift, shoulder or use a simple support to support the anchor cable, and rely on manual pushing of the anchor cable from the hole opening to the hole.

[0003] For anchor cables with a length of more than 20 meters and a weight of hundreds of kilograms or even heavier, this method requires a large amount of labor and has extremely low operation efficiency. In the pushing process, the anchor cable is easily blocked due to the local unevenness of the hole, the presence of gravel or soil block residues, and once the anchor cable is blocked in the hole, the anchor cable that has been sent in for several meters to several tens of meters needs to be pulled out, the obstacles in the hole need to be checked and handled, and then the anchor cable needs to be pushed again, which causes serious waste of time and materials, and the repeated operation efficiency is extremely low. In addition, during the process of manually pushing the heavy anchor cable near the hole opening, there are major safety risks such as sudden slipping of the anchor cable, rapid rebound, and loss of balance of personnel, which directly threaten the personal safety of the operators.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The purpose of the present application is to provide a reverse pulling device in the anchor cable hole, which solves the problems of low operation efficiency, high labor cost, easy blocking, and easy slipping or rapid rebound of the anchor cable when laying the anchor cable into the borehole.

[0006] The present application is realized by the following technical scheme: A reverse pulling device in the anchor cable hole, comprising: a base body, the base body is linear strip-shaped, one end of the base body is provided with a fixed pulley, the fixed pulley is used for sliding cooperation with a steel wire rope; a plurality of moving wheels, the moving wheels are arranged on the base body, the moving wheels are used for rolling cooperation with the hole wall of the borehole; a plurality of clamping pieces, all the clamping pieces are uniformly and spaced arranged in a ring shape with the base body as the shaft, the clamping pieces are pivotally connected to one end of the base body away from the fixed pulley through a rotating shaft, the rotating shaft is perpendicular to the base body, one side of the clamping piece away from the rotating shaft is provided with a clamping surface, the clamping surface is perpendicular to the axial direction of the rotating shaft, the clamping surface is a smooth arc surface, the distance between one side of the clamping surface close to the fixed pulley and the rotating shaft is greater than the distance between the other side of the clamping surface and the rotating shaft; a stretching and collecting mechanism, the stretching and collecting mechanism is arranged on the base body, and the stretching and collecting mechanism can synchronously rotate all the clamping pieces.

[0007] In another preferred embodiment, the card is plate-shaped and perpendicular to the corresponding rotating shaft; the card is fan-shaped to form the snap-fit ​​surface at the outer edge and to connect to the corresponding rotating shaft at the inner corner.

[0008] In another preferred embodiment, the projection of the snap-fit ​​surface along the thickness direction of the card is a spiral; the center plate surface of the card is coplanar with the axis of the base; the two sides of the snap-fit ​​surface along its length direction are respectively an unfolded side and a retracted side, and the distance between the unfolded side and the pivot is greater than the distance between the retracted side and the pivot.

[0009] In another preferred embodiment, the base includes a central support column and a base; the base is disposed at one end of the central support column, the fixed pulley is disposed on the base, and the axle of the fixed pulley is perpendicular to the central support column; the clamp is disposed at the end of the central support column away from the base.

[0010] In another preferred embodiment, the side wall of the base away from the fixed pulley is provided with a plurality of bearing seats, each bearing seat corresponding to and rotatably connected to the rotating shaft; the support and retraction mechanism includes a plurality of torsion springs, each torsion spring corresponding to and fitted onto the rotating shaft, and when the torsion spring is in its natural state, the locking member is in an unfolded posture.

[0011] In another preferred embodiment, the end of the central support column away from the base is coaxially fitted with an expansion plate, and all the bearings are arranged in a ring at uniform intervals on the outer wall of the expansion plate.

[0012] In another preferred embodiment, the support mechanism further includes a slide cylinder and multiple sets of connecting rods, each connecting rod corresponding to a locking element; the slide cylinder is slidably fitted onto the central support column, the central support column is provided with a driving mechanism, the driving mechanism enabling the slide cylinder to slide along the central support column or be fixed to the central support column; one end of each connecting rod is hinged to the side wall of the slide cylinder, and the other end is hinged to the corresponding locking element.

[0013] In another preferred embodiment, the connecting rod includes a first rod and a second rod; one end of the first rod is hinged to the side wall of the slide cylinder, and the other end is hinged to one end of the second rod; the end of the second rod away from the first rod is hinged to the corresponding clamp; the first rod and the second rod are set at an obtuse angle so that the middle part of the connecting rod is bent inward.

[0014] In another preferred embodiment, a pair of movable wheels are included, which are symmetrically arranged on both sides of the fixed pulley and coaxially arranged with the fixed pulley.

[0015] A locking system includes: a reverse traction device for anchor cable lowering hole as described above; a winch with a traction rope wound around a fixed pulley; an auxiliary feeding mechanism for feeding the reverse traction device for anchor cable lowering hole into the bottom of the borehole; and an anchor cable, one end of which is detachably connected to the free end of the traction rope.

[0016] The present invention, by adopting the above-mentioned technical solution, has the following positive effects compared with the prior art: This invention discloses a reverse traction device for anchor cables inside boreholes. A base provides the structural foundation for the device, and its linear strip shape facilitates its entry into the borehole at a relatively stable angle, preventing unnecessary large-scale deflection within the hole. Furthermore, a fixed pulley at one end of the base allows the device to slide and engage with a wire rope during insertion into the borehole. By fixing one end of the wire rope outside the hole, the device's depth within the hole can be compensated by gradually releasing the other end. Several movable wheels on the base enable smoother movement of the device within the hole. Multiple locking components further enhance the device's stability and prevent excessive movement. The clamping components are arranged in a uniform ring around the base as an axis, and are hinged to the other end of the base via a rotating shaft, which restricts the direction of the shaft. This allows the clamping components to rotate inward or outward around the base as a central axis. Furthermore, a locking surface is provided on the side of the clamping component away from the rotating shaft. This locking surface is a smooth arc surface, and the distance between the locking surface near the fixed pulley and the rotating shaft is greater than the distance between the locking surface and the shaft on the other side, creating a variable cam-like surface. When the clamping components rotate inward to their limit, all the clamping components retract into a closed position. At this point, the side of the locking surface away from the fixed pulley contacts the hole wall, and the outer diameter of the ring structure formed by all the locking surfaces is minimized, facilitating the pushing of the device into the borehole until the borehole is reached. At the bottom, as the clamps rotate outward, the outer diameter of the annular structure formed by all the clamping surfaces gradually increases, and all the clamps gradually transition to an unfolded position. During this process, depending on the diameter of the hole, the side of the clamping surface closest to the fixed pulley gradually approaches the hole wall until a certain point on each clamping surface supports a different position around the hole wall. This anchors the entire device to the hole via all the clamps. At this point, the anchor cable to be lowered is connected to one end of the wire rope, and then the other end of the wire rope is pulled, causing the wire rope to slide around the fixed pulley. The anchor cable is then gradually pulled into the borehole via the wire rope. During this process, the weight of the anchor cable is directly borne by the fixed pulley, which bears the tension in the direction of outward movement from the hole. This indirectly causes the base to bear the same tensile force. At this time, due to the support between the locking surface and the hole wall, pulling the base outward will cause the locking part to rotate slightly, so that the side of the locking surface near the fixed pulley gradually moves closer to the hole wall. Even if all the locking parts rotate to the unfolded position, the outer diameter of the ring structure formed by all the locking surfaces gradually increases, and the friction between the locking surface and the hole wall increases instead, thus producing a friction self-locking effect of "the tighter it gets", so that the reverse traction device in the lower cable hole of the anchor cable forms a stable anchor point at the bottom of the hole, thereby ensuring that the anchor cable can reach the bottom of the drilled hole and reach the design depth. By setting a support and retraction mechanism, the locking parts can be controlled to rotate synchronously, thereby controlling the switching of the locking parts between the retracted and unfolded positions.Through the above-described configuration, the reverse traction device inside the anchor hole transforms the traditional "hole-mouth pushing" anchor installation method into a "hole-bottom reverse traction" method. This effectively solves the problems of low work efficiency, high labor costs, easy jamming, and easy anchor slippage or rapid rebound when laying anchor cables in boreholes. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a reverse traction device inside the lower cable hole of an anchor cable provided by the present invention; Figure 2 This is a front view schematic diagram of a reverse traction device inside the lower cable hole of an anchor cable provided by the present invention.

[0018] The attached diagram shows the markings and corresponding component names: 10-Base; 101-Central support; 102-Base; 103-Expanding support plate; 11-Fixed pulley; 12-Shaft seat; 20-Moving wheel; 30-Clamping piece; 31-Clamping surface; 311-Expanding side; 312-Retracting side; 40-Slide cylinder; 41-First rod; 42-Second rod. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "lateral", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] It should be noted that the terms "horizontal" and "vertical" in this invention are used to describe approximate positional relationships, and not strictly "horizontal plane" or "vertical plane". Example

[0022] Please refer to Figure 1 and Figure 2As shown, this embodiment provides a reverse traction device for an anchor cable in a borehole, comprising: a base 10, the base 10 being linearly strip-shaped, with a fixed pulley 11 at one end of the base 10 for sliding engagement with a wire rope; a second portion comprising a plurality of movable wheels 20, the movable wheels 20 being disposed on the base 10 and for rolling engagement with the borehole wall; and a third portion comprising a plurality of clamping members 30, all of the clamping members 30 being evenly spaced in a ring around the base 10 as an axis, the clamping members 30 being connected to the base 10 via a rotating shaft. The base 10 is hinged at one end away from the fixed pulley 11. The rotating shaft is perpendicular to the base 10. The locking member 30 has a locking surface 31 on the side away from the rotating shaft. The locking surface 31 is perpendicular to the axis of the rotating shaft. The locking surface 31 is a smooth arc surface. The distance between the side of the locking surface 31 near the fixed pulley 11 and the rotating shaft is greater than the distance between the other side and the rotating shaft. The fourth part includes a support and retraction mechanism. The support and retraction mechanism is provided on the base 10. The support and retraction mechanism can make all the locking members 30 rotate synchronously.

[0023] The reverse traction device for anchor cable lowering in borehole disclosed in this embodiment provides a structural foundation for the device by setting a base 10. The base 10 is designed in a linear strip shape to facilitate its entry into the borehole at a relatively stable angle, preventing unnecessary large-scale deflection within the borehole. Furthermore, a fixed pulley 11 is installed at one end of the base 10, allowing the device to slide and engage with the wire rope during insertion into the borehole. By fixing one end of the wire rope outside the borehole, the device's depth into the borehole can be compensated by gradually releasing the other end. Several movable wheels 20 are provided on the base 10, enabling smoother movement of the device within the borehole. Multiple locking components 30 are provided, all of which are connected to the base 10. The shafts are arranged in a uniform ring, and are hinged to the other end of the base 10 via a rotating shaft, restricting the direction of the rotating shaft. This allows the clamping member 30 to rotate inward or outward about the base 10 as the central axis. Furthermore, a locking surface 31 is provided on the side of the clamping member 30 away from the rotating shaft. This locking surface 31 is a smooth arc surface, and the distance between the side of the locking surface 31 closest to the fixed pulley 11 and the rotating shaft is greater than the distance between the other side and the rotating shaft. This makes the locking surface 31 a variable cam-like surface. When the clamping member 30 rotates inward to its limit, all the clamping members 30 are in a retracted position. At this time, the side of the locking surface 31 away from the fixed pulley 11 contacts the hole wall, and the outer diameter of the ring structure formed by all the locking surfaces 31 is minimized, facilitating the pushing of the device into the drill hole until the drill... At the bottom of the hole, as the locking element 30 rotates outward, the outer diameter of the annular structure formed by all the locking surfaces 31 gradually increases, and all the locking elements 30 gradually transition to an unfolded posture. During this process, depending on the diameter of the hole, the side of the locking surface 31 closest to the fixed pulley 11 gradually approaches the hole wall until a certain point on all the locking surfaces 31 supports different positions around the hole wall. This allows the entire device to be anchored to the hole via all the locking elements 30. At this point, the anchor cable to be lowered is connected to one end of the wire rope, and then the other end of the wire rope is pulled, causing the wire rope to slide based on the fixed pulley 11. The anchor cable is then gradually pulled into the borehole via the wire rope. During this process, the weight of the anchor cable is directly borne by the fixed pulley 11, which bears the pulling force in the direction of outward from the hole. Indirectly, the base 10 is subjected to the same tensile force. At this time, due to the support between the locking surface 31 and the hole wall, pulling the base 10 outward will cause the locking member 30 to rotate slightly, so that the side of the locking surface 31 close to the fixed pulley 11 gradually moves closer to the hole wall. Even if all the locking members 30 rotate to the unfolded position, the outer diameter of the ring structure formed by all the locking surfaces 31 gradually increases, and the friction between the locking surface 31 and the hole wall increases instead, thus producing a friction self-locking effect of "the tighter it gets", so that the reverse traction device in the lower cable hole of the anchor cable forms a stable anchor point at the bottom of the hole, thereby ensuring that the anchor cable can reach the bottom of the drilled hole and reach the design depth. By setting the support and retraction mechanism, the locking members 30 can be controlled to rotate synchronously, thereby controlling the switching of the locking members 30 between the retracted and unfolded positions.Through the above-described configuration, the reverse traction device inside the anchor hole transforms the traditional "hole-mouth pushing" anchor installation method into a "hole-bottom reverse traction" method. This effectively solves the problems of low work efficiency, high labor costs, easy jamming, and easy anchor slippage or rapid rebound when laying anchor cables in boreholes.

[0024] To further explain the specific shape of the card 30, the card 30 is plate-shaped and is perpendicular to the corresponding rotating shaft; the card 30 is fan-shaped, with the snap-fit ​​surface 31 formed at the outer edge and connected to the corresponding rotating shaft at the inner corner.

[0025] By setting the clip 30 to be plate-shaped, it can be arranged radially along the base 10, thereby ensuring that all clips 30 have sufficient setting space, and that there is sufficient spacing between adjacent clips 30. Furthermore, the plate-shaped clip 30 can use its structural strength in the plate direction to support the snap-fit ​​surface 31, while effectively reducing its own mass to facilitate rotation along the axis.

[0026] To make the shape of the snap-fit ​​surface 31 more suitable for friction self-locking, the projection of the snap-fit ​​surface 31 along the thickness direction of the snap-fit ​​component 30 is a spiral; the middle plate surface of the snap-fit ​​component 30 is coplanar with the axis of the base 10; the two sides of the snap-fit ​​surface 31 along its length direction are respectively the unfolded side 311 and the retracted side 312, and the distance between the unfolded side 311 and the pivot is greater than the distance between the retracted side 312 and the pivot.

[0027] To further explain the specific structure of the base 10, the base 10 includes a central support column 101 and a base 102; the base 102 is located at one end of the central support column 101, the fixed pulley 11 is located on the base 102, and the axle of the fixed pulley 11 is perpendicular to the central support column 101; the clamping member 30 is located at the end of the central support column 101 away from the base 102.

[0028] With the above arrangement, the fixed pulley 11 and the locking piece 30 are located at opposite ends of the base 10. When the fixed pulley 11 is under tension, it can transmit the force more effectively through the length of the base 10, thus enabling the locking piece 30 to lock itself better.

[0029] To further explain the hinge structure between the clip 30 and the base 10, the side wall of the base 10 away from the fixed pulley 11 is provided with a plurality of bearing seats 12, each bearing seat 12 corresponding to and rotatably connected to the rotating shaft; the support and retraction mechanism includes a plurality of torsion springs, each torsion spring corresponding to and fitted onto the rotating shaft, and when the torsion spring is in its natural state, the clip 30 is in an unfolded posture.

[0030] By setting a torsion spring, the locking piece 30 can quickly rotate in the direction of the unfolded posture without being subjected to force.

[0031] To accommodate the borehole diameter, the end of the central support column 101 away from the base 102 is coaxially fitted with an expansion plate 103, and all the bearing seats 12 are evenly spaced in a ring on the outer wall of the expansion plate 103.

[0032] To further explain the specific structure of the support and retraction mechanism, the support and retraction mechanism also includes a slide cylinder 40 and multiple sets of connecting rods, each of which corresponds to a locking member 30. The slide cylinder 40 is slidably fitted onto the central support column 101, which is equipped with a driving mechanism. The driving mechanism enables the slide cylinder 40 to slide along the central support column 101 or to be fixed to the central support column 101. One end of each connecting rod is hinged to the side wall of the slide cylinder 40, and the other end is hinged to the corresponding locking member 30.

[0033] With the above settings, the slide cylinder 40 can be slidably or locked using the drive mechanism, and all the locking parts 30 can be rotated synchronously by means of the torsion spring and connecting rod.

[0034] It should be noted that the drive mechanism can be any type of drive component in the existing technology, such as a cylinder, hydraulic cylinder, electric cylinder, lead screw and nut mechanism, motor combined with threaded telescopic rod mechanism, etc., as long as it can control the slide cylinder 40 to slide along the central support column 101.

[0035] It should be noted that the side wall of the central support 101 is provided with a limiting hole to limit the sliding of the slide cylinder 40 and prevent it from sliding excessively toward the clamp 30, which would cause the clamp 30 to over-rotate.

[0036] It should be noted that the drive mechanism is operated remotely via electronic control to facilitate the unfolding of the card 30 at the bottom of the hole.

[0037] To further explain the specific structure of the connecting rod, the connecting rod includes a first rod 41 and a second rod 42; one end of the first rod 41 is hinged to the side wall of the slide cylinder 40, and the other end is hinged to one end of the second rod 42; the end of the second rod 42 away from the first rod 41 is hinged to the corresponding clamp 30; the first rod 41 and the second rod 42 are set at an obtuse angle so that the middle part of the connecting rod is bent inward.

[0038] With the above settings, when the slide cylinder 40 is locked, the locking piece 30 can still perform small-amplitude rotational compensation by rotating the first rod 41 and the second rod 42 relative to each other, so as to implement frictional self-locking. That is, when the base 10 is subjected to an outward pulling force, causing the locking piece 30 to rotate slightly in the direction of the unfolded posture, the locking piece 30 will pull the second rod 42, and the second rod 42 will pull the first rod 41. Since the position of the end of the first rod 41 connected to the slide cylinder 40 is fixed, the first rod 41 and the second rod 42 will gradually rotate in the coaxial direction, thereby compensating for the rotation of the locking piece 30.

[0039] Preferably, the reverse traction device in the lower cable hole of the anchor cable includes a pair of movable wheels 20, which are symmetrically arranged on both sides of the fixed pulley 11 and coaxially arranged with the fixed pulley 11.

[0040] This embodiment also provides a locking system, including: any of the above-mentioned reverse traction devices in the anchor cable lowering hole; secondly, a winch with a traction rope wound around the fixed pulley 11; thirdly, an auxiliary feeding mechanism for feeding the reverse traction device in the anchor cable lowering hole into the bottom of the borehole; and fourthly, an anchor cable, one end of which can be detachably connected to the free end of the traction rope.

[0041] When using it, the following steps are included: S1. The slide cylinder 40 is controlled to slide by the drive mechanism so that all the clips 30 are in the retracted position. S2. Fix one end of the traction rope to the winch, and wind the other end around the fixed pulley 11 and lead it back to the borehole opening; S3. Place the reverse traction device inside the anchor cable hole into the hole and send it to the bottom of the borehole through the auxiliary feeding mechanism; S4. Remote control drive mechanism to make all the clips 30 unfold outward so that the clip surface 31 supports the hole wall, thereby placing the reverse traction device in the lower cable hole of the anchor cable into the bottom of the hole. S5. Connect the free end of the traction rope to the anchor cable; S6. By using a winch to pull the traction rope, the free end of the traction rope gradually pulls the anchor cable closer to the fixed pulley 11. Under the continuous and stable mechanical pulling force of the winch, the anchor cable is smoothly and controllably pulled into the borehole until it reaches the designed depth.

[0042] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A reverse traction device inside the anchor cable hole, characterized in that, include: The base (10) is linear strip-shaped, and a fixed pulley (11) is provided at one end of the base (10). The fixed pulley (11) is used to slide with the wire rope. A plurality of movable wheels (20) are provided on the base (10) and the movable wheels (20) are used to roll with the hole wall of the drilled hole; Multiple clips (30) are arranged in a ring with the base (10) as the axis. Each clip (30) is hinged to the base (10) at the end away from the fixed pulley (11) via a rotating shaft. The rotating shaft is perpendicular to the base (10). Each clip (30) has a snap-fit ​​surface (31) on the side away from the rotating shaft. The snap-fit ​​surface (31) is perpendicular to the axis of the rotating shaft. The snap-fit ​​surface (31) is a smooth arc surface. The distance between the snap-fit ​​surface (31) near the fixed pulley (11) and the rotating shaft is greater than the distance between the other side and the rotating shaft. A support and retraction mechanism is provided on the base (10), which enables all the card pieces (30) to rotate synchronously.

2. The reverse traction device in the lower cable hole of the anchor cable according to claim 1, characterized in that, The card (30) is plate-shaped and is perpendicular to the corresponding rotating shaft; The card (30) is fan-shaped, forming the snap-fit ​​surface (31) at the outer edge and connecting to the corresponding pivot at the inner corner.

3. The reverse traction device in the lower cable hole of the anchor cable according to claim 2, characterized in that, The projection of the snap-fit ​​surface (31) along the thickness direction of the snap-fit ​​piece (30) is a spiral; The center plate surface of the card (30) is coplanar with the axis of the base (10); The two sides of the snap-fit ​​surface (31) along its length are an unfolded side (311) and a retracted side (312), respectively. The distance between the unfolded side (311) and the pivot is greater than the distance between the retracted side (312) and the pivot.

4. The reverse traction device in the lower cable hole of the anchor cable according to claim 1, characterized in that, The base (10) includes a central support (101) and a base (102); The base (102) is located at one end of the central support column (101), and the fixed pulley (11) is located on the base (102). The axle of the fixed pulley (11) is perpendicular to the central support column (101). The card (30) is located at the end of the central support (101) away from the base (102).

5. The reverse traction device in the lower cable hole of the anchor cable according to claim 4, characterized in that, The side wall of the base (10) away from the fixed pulley (11) is provided with a plurality of bearing seats (12), and the bearing seats (12) correspond one-to-one with the rotating shaft and are rotatably connected. The support and retraction mechanism includes multiple torsion springs, each corresponding to and fitted with a rotating shaft. When the torsion spring is in its natural state, the locking piece (30) is in an unfolded position.

6. The reverse traction device in the lower cable hole of the anchor cable according to claim 5, characterized in that, The central support (101) is coaxially fitted with an expansion plate (103) at one end away from the base (102), and all the bearings (12) are arranged in a ring at uniform intervals on the outer wall of the expansion plate (103).

7. The reverse traction device in the lower cable hole of the anchor cable according to claim 6, characterized in that, The support and retraction mechanism also includes a slide cylinder (40) and multiple sets of connecting rods, each of which corresponds to a locking piece (30). The slide cylinder (40) is slidably fitted onto the central support column (101). The central support column (101) is provided with a driving mechanism, which enables the slide cylinder (40) to slide along the central support column (101) or to be fixed to the central support column (101). One end of the connecting rod is hinged to the side wall of the slide (40), and the other end is hinged to the corresponding clamp (30).

8. The reverse traction device in the lower cable hole of the anchor cable according to claim 7, characterized in that, The connecting rod includes a first rod (41) and a second rod (42); One end of the first rod (41) is hinged to the side wall of the slide cylinder (40), and the other end is hinged to one end of the second rod (42); The end of the second rod (42) away from the first rod (41) is hinged to the corresponding clamp (30); The first rod (41) and the second rod (42) are set at an obtuse angle so that the middle part of the connecting rod is bent inward.

9. The reverse traction device in the lower cable hole of the anchor cable according to claim 4, characterized in that, It includes a pair of movable wheels (20), which are symmetrically arranged on both sides of the fixed pulley (11) and coaxially arranged with the fixed pulley (11).

10. A locking system, characterized in that, include: The reverse traction device in the lower cable hole of the anchor cable as described in any one of claims 1-9; A winch, wherein a traction rope is wound on the winch and the traction rope is wound around the fixed pulley (11). An auxiliary feeding mechanism is used to feed the reverse traction device inside the anchor cable lower hole into the bottom of the borehole. An anchor cable, one end of which can be detachably connected to the free end of the traction rope.

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