Sleeve taking-out mechanism and sleeve taking-out device

Abstract

The invention discloses a sleeve taking-out mechanism and a sleeve taking-out device. The sleeve taking-out mechanism comprises a rotating base and a screwing module. The rotating seat is connected with the screwing module in a sliding fit manner; a connecting hole is vertically formed in the central position of the rotating seat in a penetrating manner; the screwing module comprises a connecting rod and a screwing column which are vertically distributed; the top end of the connecting rod is positioned in the connecting hole of the rotating seat; after the connecting rod penetrates through the connecting hole, the bottom end of the connecting rod is connected with the top of the screwing column; the top end of the connecting rod is used for being connected with an internal hexagonal wrench or a power output end of an external electric tool; an external thread is arranged on the circumferential outer wall of the screwing column; the screwing column is used for being in threaded connection with the interior of the hollow nylon sleeve needing to be taken out; the bottom end of the rotating seat is connected with the top of the nylon sleeve. According to the device, the nylon sleeve can be conveniently and rapidly taken out from the stainless steel sleeve, the working time for replacing the nylon sleeve is shortened, and the daily maintenance quality and maintenance efficiency of the embedded nut set are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of railway transportation, and in particular to a casing taking-out mechanism and a casing taking-out device. Background Art

[0002] See also Figures 1 to 4 As shown, for the railway concrete track slab 1 (i.e., railway hump marshalling yard sleepers), the embedded parts thereon are mostly embedded nut groups 2, which include a stainless steel sleeve 21 and a nylon sleeve 22. The hollow nylon sleeve 22 is embedded in the hollow stainless steel sleeve 21 and is threadedly connected to the stainless steel sleeve 21 (the external thread on the nylon sleeve 22 is threadedly connected to the internal thread of the stainless steel sleeve 21).

[0003] Among them, the stainless steel sleeve 21 will be cast together with the cement after the concrete track plate 1 is cast. After the cement solidifies, the stainless steel sleeve 21 cannot be removed. However, if the nylon sleeve 22 is damaged during use, it needs to be replaced, that is, the old nylon sleeve is taken out and a new nylon sleeve is installed.

[0004] It should be noted that the inner wall of the nylon sleeve 22 has nylon threads, which are threadedly connected with threads on the wire thread sleeve 23 placed in the nylon sleeve 22 through the nylon threads.

[0005] In specific applications, for external railway equipment that needs to be fixed on the railway concrete track plate 1, the embedded nut group 2 is fixedly connected by fastening bolts. Specifically, the screw rod of the fastening bolt passes through the bolt through hole on the external railway equipment mounting seat from top to bottom, and then the screw rod part of the fastening bolt is threadedly connected with the wire thread sleeve 23 inside the nylon sleeve 22, thereby ensuring the fixing effect.

[0006] In specific operations, in order to prevent the fastening bolts from loosening, the on-site users used a high-torque wrench to tighten them. Due to the excessive tightening torque, the wire screw sleeve 23 inside the nylon casing 22 is easily caused to gradually shrink and be tightened with the thread of the fastening bolt. The fastening bolt drives the wire screw sleeve 23 to rotate continuously. Since the strength of the nylon thread on the inner wall of the nylon casing 22 (used to match the thread of the wire screw sleeve 23) is lower than the thread strength of the wire screw sleeve 23, the wire screw sleeve 23 is easily damaged during the rotation of the nylon thread in the nylon casing 22, and even the nylon thread in the nylon casing 22 is partially worn flat, which eventually leads to the inability to tighten the fastening bolt again, making the nylon casing unusable.

[0007] However, there is no convenient tool for removing the nylon sleeve at present. Only a sheet tool (knife) with a conical tip can be used to enter the nylon sleeve by hitting the end of the tool with a hammer. Since the spirally distributed wire screw sleeve 23 is installed inside the hollow nylon sleeve 22, the sheet tool cannot be well clamped with the nylon sleeve. At this time, if the knocking force is too large, the nylon sleeve will break. After the nylon sleeve 22 is broken and damaged, the difficulty of removing increases, and the nylon sleeve 22 cannot be removed as a whole. If the knocking force is small, the nylon sleeve and the tool are not firmly matched (i.e., not firmly clamped), and the nylon sleeve cannot be removed. Therefore, the disassembly of the nylon sleeve is very difficult, which seriously affects the daily maintenance quality and maintenance efficiency of the embedded nut group and increases the work intensity of the staff.

[0008] It should be noted that the wire screw sleeve 23 and the nylon sleeve 22 are threaded installation structures, and the nylon itself has a certain degree of plastic deformation. After the sheet tool penetrates into the nylon sleeve, it contacts the internal thread of the wire screw sleeve 23. Due to the high strength of the internal thread of the wire screw sleeve 23, the sheet tool cannot be embedded in the internal thread of the wire screw sleeve 23. The sheet tool can only compress the wire screw sleeve 23 to gradually embed into the nylon thread of the nylon sleeve 22. Since this joint is a flexible connection, the sheet tool cannot be well clamped with the nylon sleeve 22. Therefore, it is urgent to develop a technology that can solve the above technical problems. Summary of the invention

[0009] The purpose of the present invention is to provide a sleeve removal mechanism and a sleeve removal device in view of the technical defects in the prior art.

[0010] To this end, the present invention provides a casing removal mechanism, which includes a rotating seat and a tightening module;

[0011] The rotating seat and the tightening module are connected by sliding fit;

[0012] A connecting hole is vertically provided at the center of the rotating seat;

[0013] A tightening module, comprising a vertically distributed connecting rod and a tightening column;

[0014] The top end of the connecting rod is located in the connecting hole of the rotating seat;

[0015] After the connecting rod passes through the connecting hole, its bottom end is connected to the top of the tightening column;

[0016] The top end of the connecting rod is used to connect with a hexagonal wrench or a power output end of an external electric tool;

[0017] The circumferential outer wall of the tightening column is provided with an external thread;

[0018] The tightening post is used to threadably connect with the inside of the hollow nylon sleeve that needs to be removed.

[0019] In addition, the present invention also provides a casing removal device, which includes the casing removal mechanism as described above, and an electric wrench;

[0020] The power output end of the electric wrench is connected to the top end of the connecting rod in the casing removal mechanism.

[0021] It can be seen from the technical solution provided by the present invention that, compared with the prior art, the present invention provides a casing removal mechanism and a casing removal device, which have a scientific structural design and can conveniently and quickly remove the nylon casing from the stainless steel casing, shortening the working time for replacing the nylon casing, thereby ensuring the daily maintenance quality and maintenance efficiency of the embedded nut group, reducing the work intensity of the staff, and having great practical significance.

[0022] By applying the present invention, the nylon sleeve can be taken out from the stainless steel sleeve as a whole, which significantly improves the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure when a plurality of embedded nut groups are arranged on a railway concrete track slab;

[0024] Figure 2 This is a schematic diagram of the structure of a pre-embedded nut group with a complete structure. At this time, the nylon sleeve is in a normal and undamaged state;

[0025] Figure 3 It is a three-dimensional structural schematic diagram of a stainless steel sleeve included in a pre-embedded nut set;

[0026] Figure 4 A schematic diagram of a three-dimensional structure of a nylon sleeve included in a pre-embedded nut set;

[0027] Figure 5 A three-dimensional structure diagram of a cannula removal mechanism provided by the present invention Figure 1 ;

[0028] Figure 6 A three-dimensional structure diagram of a cannula removal mechanism provided by the present invention Figure 2 ;

[0029] Figure 7 A three-dimensional structure diagram of a rotating seat in a sleeve removal mechanism provided by the present invention Figure 1 ;

[0030] Figure 8 A three-dimensional structure diagram of a rotating seat in a sleeve removal mechanism provided by the present invention Figure 2 ;

[0031] Fig. 9 A schematic diagram of the three-dimensional structure of a tightening module in a sleeve removal mechanism provided by the present invention;

[0032] Fig.10 A schematic diagram of a three-dimensional structure of a connecting rod of a tightening module in a casing removal mechanism provided by the present invention Figure 1 ;

[0033] Fig.11 A schematic diagram of a three-dimensional structure of a connecting rod of a tightening module in a casing removal mechanism provided by the present invention Figure 2 ;

[0034] Fig.12 A schematic diagram of the three-dimensional structure of a tightening column of a tightening module in a casing removal mechanism provided by the present invention;

[0035] In the figure: 1. Concrete track plate for railway, 2. Embedded nut set, 21. Stainless steel casing, 22. Nylon casing;

[0036] 3. Rotate the seat, 4. Tighten the module;

[0037] 31. Connection hole;

[0038] 41. Connecting rod, 42. Tightening column. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] See also Figures 1 to 12 , the present invention provides a casing removal mechanism, comprising: a rotating seat 3 and a tightening module 4;

[0044] The rotating seat 3 and the tightening module 4 are connected in a sliding fit;

[0045] A connecting hole 31 is vertically provided at the center of the rotating seat 3;

[0046] The tightening module 4 includes a vertically distributed connecting rod 41 and a tightening column 42;

[0047] The top end of the connecting rod 41 is located in the connecting hole 31 of the rotating seat 3;

[0048] After the connecting rod 41 passes through the connecting hole 31, its bottom end is connected to the top of the tightening column 42;

[0049] The top end of the connecting rod 41 is used to connect with a hexagonal wrench, or to connect with a power output end (such as a chuck, specifically a hexagonal docking rod installed on the chuck) of an external electric tool (such as an electric wrench);

[0050] The circumferential outer wall of the tightening column 42 is provided with an external thread;

[0051] The tightening column 42 is used to be threadedly connected to the inside of the hollow nylon casing 22 to be removed (specifically, it is threadedly fixedly connected to the internal thread of the wire screw sleeve 23 provided inside the nylon casing 22);

[0052] The bottom end of the rotating seat 3 (specifically the support bar 330 and the positioning cylinder 331 therein) is connected to the top of the nylon sleeve 22 to be removed.

[0053] It should be noted that the nylon sleeve 22 is disposed in the stainless steel sleeve 21 ; the stainless steel sleeve 21 is fixedly disposed in the railway concrete track slab 1 . The wire thread sleeve 23 is located in the middle and lower regions of the nylon sleeve 22 .

[0054] In the present invention, in a specific implementation, the upper portion of the rotating seat 3 is an outer hexagonal block 32;

[0055] The upper hole section of the connecting hole 31 is located at the center of the outer hexagonal block 32 .

[0056] In specific implementation, the lower part of the rotating seat 3 is a rotating base 33;

[0057] The lower hole section of the connecting hole 31 is located at the center of the rotating base 33 .

[0058] The bottom surface of the rotating base 33 is provided with four radially distributed support bars 330 protruding downward;

[0059] The connecting holes 31 are located in the inner side of the four supporting bars 330;

[0060] There are radially distributed positioning grooves between any two adjacent support bars 330;

[0061] A positioning cylinder 331 is protruding downwardly from the bottom surface of the rotating base 33;

[0062] The positioning cylinder 331 is fitted with the inner side of the top opening of the nylon sleeve 22 to be removed;

[0063] The radial inner end of the support bar 330 is connected to the circumferential outer wall of the positioning cylinder 331 .

[0064] Furthermore, the four support bars 330 are plugged into the four grooves 220 on the top of the nylon sleeve 22 to be removed.

[0065] It should be noted that the support bar 330 corresponds to the shape and size of the groove 220 at the top of the nylon sleeve 22 .

[0066] Furthermore, the plurality of support bars 330 are distributed in a rotationally symmetrical manner, specifically in a cross shape.

[0067] It should be noted that the upper part of the rotating seat 3 is an outer hexagonal structure (outer hexagonal block 32), and there is a connecting hole 31 inside the outer hexagonal block 32 to facilitate the free movement of the tightening module 4. The bottom of the rotating seat 3 is a four-corner structure, and the connecting rod 41 in the tightening module 4 can move freely in the connecting hole 31.

[0068] In the present invention, in a specific implementation, the connecting rod 41 includes a tool docking block 411 and a tightening column docking rod 412 distributed up and down;

[0069] The tool docking block 411 is located in the connecting hole 31 of the rotating seat 3;

[0070] The tool docking block 411 is connected to the top of the tightening column docking rod 412;

[0071] The tool docking block 411 is provided with an inner hexagonal hole 4110 with a top opening;

[0072] The inner hexagonal hole 4110 is used to connect with an inner hexagonal wrench, or to connect with a hexagonal docking rod (i.e., a hexagonal head) installed on the power output end (e.g., a chuck) of an external electric tool (e.g., an electric wrench).

[0073] It should be noted that the shape and size of the hexagonal docking rod installed on the power output end (such as a chuck) of the external power tool (such as an electric wrench) corresponds to the shape and size of the inner hexagonal hole 4110 at the top end of the connecting rod 41.

[0074] It should be noted that the shape and size of the hexagonal wrench correspond to the shape and size of the hexagonal hole 4110 at the top end of the connecting rod 41.

[0075] In a specific implementation, the shape of the tightening column docking rod 412 is cylindrical.

[0076] In specific implementation, the connection hole 31 of the rotating seat 3 is a stepped hole;

[0077] The connecting hole 31 includes an upper hole section 311 and a lower hole section 312 which are connected to each other;

[0078] The upper hole section 311 is located on the top of the lower hole section 312;

[0079] The diameter of the upper hole section 311 is greater than the diameter of the lower hole section 312;

[0080] Furthermore, the center points of the upper hole section 311 and the lower hole section 312 are located on the same vertical center line.

[0081] Furthermore, the diameter of the tool docking block 411 is larger than the diameter of the lower hole section 312 of the connecting hole 31 , and smaller than the diameter of the upper hole section 311 of the connecting hole 31 .

[0082] Furthermore, the diameter of the tightening post docking rod 412 is smaller than the diameter of the lower hole section 312 of the connecting hole 31 .

[0083] In specific implementation, a square docking block 4120 (in the shape of a cuboid) is provided at the lower end of the tightening column docking rod 412;

[0084] The top of the screw post 42 has an inner square hole 420 opening upward;

[0085] The square docking block 4120 of the tightening post docking rod 412 is plugged into the inner square hole 420 of the tightening post 42 .

[0086] It should be noted that, for the present invention, the tightening module 4 includes a connecting rod 41 and a tightening column 42, the head of the connecting rod 41 is a hexagonal structure, which is convenient for tightening with a hexagonal wrench, and the lower part of the connecting rod 41 is a square structure (square docking block 4120);

[0087] The tightening column 42 is an external M24 thread structure, and the top surface is an internal square structure (internal square hole 420);

[0088] The square structure (square docking block 4120 ) at the bottom of the connecting rod 41 is tightly matched with the square structure (inner square hole 420 ) inside the tightening column 42 , and the two are connected together to form a whole, forming the tightening module 4 .

[0089] Based on the above-mentioned casing removal mechanism provided by the present invention, the present invention further provides a casing removal device, which includes the casing removal mechanism 100 as described above, and an electric wrench;

[0090] The power output end (eg, the chuck) of the electric wrench is connected to the top end (specifically, the hexagonal inner hole 4110 at the top) of the connecting rod 41 in the sleeve removal mechanism 100 .

[0091] In the present invention, in a specific implementation, a hexagonal docking rod is provided on the power output end (e.g., chuck) of the electric wrench;

[0092] The hexagonal docking rod is connected (eg plugged) to the inner hexagonal hole 4110 at the top of the connecting rod 41 in the casing removal mechanism 100 .

[0093] In a specific implementation, the hexagonal butt joint rod can be a vertically distributed, elongated rod-shaped joint, and its cross-sectional shape is a regular hexagon.

[0094] It should be noted that the shape and size of the hexagonal docking rod installed on the power output end (such as a chuck) of the external power tool (such as an electric wrench) corresponds to the shape and size of the inner hexagonal hole 4110 at the top end of the connecting rod 41.

[0095] In the present invention, in a specific implementation, the power output end of the electric wrench, for example, the chuck of the electric wrench, is connected to one end of the hexagonal docking rod (clamped or snapped), and the other end of the hexagonal docking rod is connected to the inner hexagonal hole 4110 at the top of the connecting rod 41 (for example, plugged in).

[0096] It should be noted that the connection between the power output end of the electric wrench and the hexagonal docking rod can be a clamping connection or a snap connection, or other reliable connection methods. This is a conventional mature technology and will not be described here.

[0097] It should be noted that the electric wrench is preferably a brushless electric wrench. The electric wrench is also called an electric screwdriver or an electric hand drill. It is a general tool with mature prior art and has been widely used, and will not be described in detail here.

[0098] In order to more clearly understand the technical solution of the present invention, the working principle of the present invention is described below.

[0099] It should be noted that, for the present invention, an electric wrench can be used, with the end of the wrench clamping an inner hexagonal wrench (or a hexagonal wrench can be used directly), the hexagonal wrench can be placed in the inner hexagonal hole 4110 at the top of the connecting rod 41, and the electric wrench can be rotated forward (tightened), driving the tightening module 4, and entering the interior of the nylon sleeve 22 through the threads on the outside of the tightening column 42 and engaging with the threads inside the wire screw sleeve 23 to achieve secure tightening; after tightening, the bottom of the cylindrical head (i.e., the tool docking block 41) at the top of the connecting rod 41 is tightly attached to the upper side of the connecting hole 31 of the rotating seat 3, and the rotating seat 3 is pressed, at this time, the electric wrench with a square head (i.e., a socket head) is replaced, and a socket wrench is installed on the square head, and the socket wrench is placed on the outside of the outer hexagonal block 32 at the top of the rotating shaft;

[0100] The cross groove structure at the bottom of the rotating seat 3 (i.e. the positioning groove between the support bars 330) cooperates with the cross groove structure at the top of the nylon sleeve 22 (i.e. the groove 220 at the top), and the middle cylinder of the cross groove structure (i.e. the positioning cylinder 331) serves as a positioning column, which is tightly attached to the inner side of the top opening of the nylon sleeve 22 as a positioning structure. At this time, the electric wrench is reversed, and the socket head rotates in the opposite direction, driving the rotating seat 3 to rotate. The cross groove structure of the rotating seat 3 (i.e. the positioning groove between the support bars 330) drives the nylon sleeve 22 to rotate at the same time. At the same time, the tightening module 4 at the bottom drives the wire screw sleeve 23 inside the nylon sleeve. The two rotate in coordination to remove the nylon sleeve 22 from the stainless steel sleeve 21.

[0101] It should be noted that since nylon material is prone to aging and its strength is easily reduced, a single unscrewing structure can easily cause the nylon sleeve to break when it is removed. Only when the two structures (i.e., the tightening structure with the tightening module 4 as the main body, and the cross groove structure with the rotating seat 3 as the main body) are combined can the nylon sleeve in the embedded nut be effectively removed.

[0102] In order to more clearly understand the technical solution of the present invention, the specific operation process of the present invention is described below.

[0103] The first step is to put the four corner structures (i.e., including four support bars 330) at the bottom of the rotating seat 3 into the four grooves 220 on the upper part of the nylon sleeve 22 in the embedded nut group 2, and press it down by hand so that the tightening module 4 slides into the nylon sleeve 22 inside the embedded nut group 2 through the connecting hole 31 in the rotating seat 3, and turn the tightening module 4 by hand, so that a part (i.e., a small section) of the thread outside the tightening column 42 in the tightening module 4 cooperates with the internal thread inside the nylon sleeve 22 (i.e., the internal thread of the wire screw sleeve 23), so as to slowly screw into the nylon sleeve 22;

[0104] The second step is to use an electric tool (such as an electric wrench) with a hexagonal head (i.e., a hexagonal docking rod) to extend the hexagonal head (i.e., a hexagonal docking rod) into the inner hexagonal hole 4110 (hexagonal structure) at the top of the connecting rod 41 to tighten the connecting rod. The connecting rod 41 drives the tightening column 42, and the tightening column 42 is quickly screwed into the inside of the nylon sleeve 22 in the embedded nut group 2 (i.e., the inside of the wire screw sleeve 23 installed in the hollow nylon sleeve 22) through the external thread thereon. After the connection is firmly established, the bottom surface of the head of the connecting rod 41 (i.e., the tool docking block 411) is attached to and tightened with the upper plane of the connecting hole 31 of the rotating seat 3 (because the tool docking block 411 has pressed the upper plane of the connecting hole 31 downward);

[0105] In the third step, a socket head matched with the electric wrench is then used (the electric wrench is matched with a socket head, the socket head is installed on the power output end of the electric wrench, the socket wrench is installed on the socket head, the socket wrench has an inner hexagonal hole with a bottom opening, the inner hexagonal hole corresponds to the shape and size of the outer hexagonal block 32, and the socket wrench is put on the outer side of the outer hexagonal block 32 of the rotating seat 3), the outer hexagonal block 32 is docked, and then the power output end of the electric wrench is controlled to rotate in the opposite direction. At this time, the reverse force of the electric wrench and the force of screwing out the thread are combined to screw out the nylon sleeve 22 in the embedded nut group 2 upward and outward as a whole, thereby achieving the purpose of disassembling the entire nylon sleeve 22.

[0106] It should be noted that, for the present invention, the nylon sleeve 22 that needs to be removed and taken out requires that the groove 220 at the top of the nylon sleeve 22 can be used normally, so that the rotating seat 3 can achieve reliable positioning and docking of the nylon sleeve 22, and then under the drive of external force, the rotating seat 3 can drive the nylon sleeve 22 to rotate together.

[0107] Compared with the prior art, the cannula removal mechanism and cannula removal device provided by the present invention have the following beneficial effects:

[0108] 1. By applying the present invention, the operation is convenient, and the nylon sleeve can be removed by using only universal tools (hexagonal wrench and torque wrench with sleeve) or electric universal wrench.

[0109] 2. The tightening module 4 of the present invention has a positioning rod (i.e., a connecting rod 41 ). The external thread on the tightening column 42 at the lower part of the tightening module 4 tightens the wire screw sleeve 23 in the nylon sleeve 22 and positions it with the rotating seat 3 .

[0110] 3. There is a cross groove positioning structure on the rotating seat 3 (i.e., the positioning groove between the support bars 330), which is positioned with the existing structure outside the nylon sleeve 22 (i.e., the groove 220 at the top).

[0111] 4. In the present invention, the tightening structure (ie, the tightening module 4) and the cross groove positioning structure on the rotating seat 3 are used together, so that the nylon sleeve 22 can be removed from the stainless steel sleeve without damaging it.

[0112] 5. The connecting rod 41 in the rotating seat 3 can move freely through the connecting hole 31 , so as to facilitate the threads outside the tightening column 42 in the tightening module 4 to freely tighten the wire screw sleeve 23 inside the nylon sleeve 22 .

[0113] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sleeve removal mechanism, characterized in that: It comprises a rotating seat (3) and a tightening module (4); The rotating seat (3) and the tightening module (4) are connected in a sliding fit; A connecting hole (31) is vertically provided at the center of the rotating seat (3); A tightening module (4), comprising a vertically distributed connecting rod (41) and a tightening column (42); The top end of the connecting rod (41) is located in the connecting hole (31) of the rotating seat (3); After the connecting rod (41) passes through the connecting hole (31), its bottom end is connected to the top of the tightening column (42); The top end of the connecting rod (41) is used to be connected to a hexagonal wrench or to be connected to a power output end of an external electric tool; The circumferential outer wall of the tightening column (42) is provided with an external thread; A tightening post (42) is used to be threadedly connected to the inside of the hollow nylon sleeve (22) to be removed; The bottom end of the rotating seat (3) is connected to the top of the nylon sleeve (22).

2. The sleeve removal mechanism according to claim 1, characterized in that: The upper part of the rotating seat (3) is an outer hexagonal block (32); The upper hole section of the connecting hole (31) is located at the center of the outer hexagonal block (32).

3. The sleeve removal mechanism according to claim 1, characterized in that: The lower part of the rotating seat (3) is a rotating base (33); The lower hole section of the connecting hole (31) is located at the center of the rotating base (33); The bottom surface of the rotating base (33) is provided with four radially distributed support bars (330) protruding downward; A connecting hole (31) located in the inner side of the four supporting bars (330); There are radially distributed positioning grooves between any two adjacent support bars (330).

4. The sleeve removal mechanism according to claim 3, characterized in that: A positioning cylinder (331) is protruding downwardly from the bottom surface of the rotating base (33); The positioning cylinder (331) is fitted with the inner side of the top opening of the nylon sleeve (22) to be removed; The radial inner end of the support bar (330) is connected to the circumferential outer wall of the positioning cylinder (331).

5. The sleeve removal mechanism according to claim 3, characterized in that: Four support bars (330) are plugged into four grooves (220) on the top of the nylon sleeve (22) to be removed; The support bar (330) corresponds to and matches the shape and size of the groove (220) at the top of the nylon sleeve (22).

6. The cannula removal mechanism according to any one of claims 1 to 5, characterized in that: A connecting rod (41), comprising a tool docking block (411) and a tightening column docking rod (412) distributed up and down; The tool docking block (411) is located in the connecting hole (31) of the rotating seat (3); The tool docking block (411) is connected to the top of the tightening column docking rod (412); The tool docking block (411) is provided with an inner hexagonal hole (4110) with a top opening; The inner hexagonal hole (4110) is used to be connected to an inner hexagonal wrench, or to be connected to a hexagonal butt rod installed on the power output end of an external electric tool.

7. The sleeve removal mechanism according to claim 1, characterized in that: The connecting hole (31) of the rotating seat (3) is a stepped hole; A connecting hole (31), comprising an upper hole section (311) and a lower hole section (312) which are connected to each other; An upper hole section (311) located on top of the lower hole section (312); The diameter of the upper hole section (311) is greater than the diameter of the lower hole section (312).

8. The sleeve removal mechanism according to claim 7, characterized in that: The center points of the upper hole section (311) and the lower hole section (312) are located on the same vertical center line; The diameter of the tool docking block (411) is larger than the diameter of the lower hole section (312) of the connecting hole (31), and smaller than the diameter of the upper hole section (311) of the connecting hole (31).

9. The sleeve removal mechanism according to claim 6, characterized in that: A square docking block (4120) is provided at the lower end of the tightening column docking rod (412); The top of the tightening column (42) has an inner square hole (420) opening upward; The square docking block (4120) of the tightening column docking rod (412) is plugged into the inner square hole (420) of the tightening column (42).

10. A cannula removal device, characterized in that: A casing removal mechanism comprising the casing removal mechanism as claimed in any one of claims 1 to 9, and an electric wrench; The power output end of the electric wrench is connected to the top end of the connecting rod (41) in the casing removal mechanism (100).

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