Double-layer sleeve tool capable of avoiding cable

Abstract

The utility model discloses a double-layer sleeve tool capable of avoiding a cable, which relates to the technical field of part application and comprises a lengthened longitudinal sleeve inserted in an outer sleeve, the inner circumference shape of the lengthened longitudinal sleeve is matched with the outer circumference shape of an end part of the cable, one end of the lengthened longitudinal sleeve extends to the outside of the outer sleeve, and the other end of the lengthened longitudinal sleeve extends to the outside of the outer sleeve. The periphery of one end of the lengthened longitudinal sleeve is polygonal, first openings which are axially through are correspondingly formed in the lengthened longitudinal sleeve and the outer sleeve, and the interior of the lengthened longitudinal sleeve is communicated with the exterior of the outer sleeve through the first openings; the connecting structure is arranged between the lengthened longitudinal sleeve and the outer sleeve; according to the sleeve tool, a cable can be placed into the lengthened longitudinal sleeve through the first opening, avoiding of the cable is achieved, parts at the ends of the cable are driven to rotate through the shape of the inner circumference of the lengthened longitudinal sleeve, and therefore the sleeve tool can enter various deep groove parts to be mounted and dismounted; the sleeve tool is small in size, light in weight and easy and fast to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of parts application, and more specifically, relates to a double-layer sleeve tool capable of avoiding cables. Background Art

[0002] In aviation and aerospace products, temperature, hydraulic pressure, and humidity sensing devices with cables are often used. For example, the engines of some medium and small unmanned aerial vehicles are equipped with a variety of sensing devices such as lubricating oil pressure and exhaust temperature. The number of installed devices is large. Due to the connection form, the clamping parts of the parts are often hexagonal in shape, and most of them are installed in deep groove structures such as engines. Ordinary tools cannot avoid cable clamping parts to install or remove such products in deep grooves. Therefore, it is necessary to design a tool that can avoid cables to achieve the purpose of installation and tightening.

[0003] The design difficulties are: first, avoiding cables during installation; second, being adaptable to a variety of clamping shapes; and third, saving time, manpower, and being easy to operate. Utility Model Content

[0004] The purpose of the utility model is to address the deficiencies in the existing technology and provide a double-layer sleeve tool that can avoid cables. The sleeve tool can also rotate around cables and is suitable for the installation and disassembly of various deep-groove parts. It also has the characteristics of small size, light weight, and simple and quick operation.

[0005] In order to achieve the above-mentioned object, the utility model provides a double-layer sleeve tool capable of avoiding cables, comprising:

[0006] An extended longitudinal sleeve is inserted into the outer sleeve, the inner circumference of the extended longitudinal sleeve matches the outer circumference of the end part of the cable, one end of the extended longitudinal sleeve extends to the outside of the outer sleeve, the outer circumference of one end of the extended longitudinal sleeve is polygonal, and the extended longitudinal sleeve and the outer sleeve are respectively provided with axially extending first openings, and the first opening connects the interior of the extended longitudinal sleeve with the exterior of the outer sleeve;

[0007] A connecting structure is provided between the elongated longitudinal sleeve and the outer sleeve.

[0008] Optionally, the outer circumference of the other end of the extended longitudinal sleeve is cylindrical, the radial dimension of the middle part of the extended longitudinal sleeve is larger than the radial dimensions of the two ends of the extended longitudinal sleeve, and the other end and the middle part of the extended longitudinal sleeve are located inside the outer sleeve.

[0009] Optionally, the sleeve includes a first cylinder and a second cylinder arranged in parallel, the radial dimension of the first cylinder is larger than the radial dimension of the second cylinder, and the first cylinder and the second cylinder are penetrated by connecting circular holes of equal diameter, the connecting circular holes cooperate with the other end and the middle part of the extended longitudinal sleeve, and the middle end face of the extended longitudinal sleeve is clamped with the end face of the second cylinder.

[0010] Optionally, the outer surface of the first cylinder is knurled.

[0011] Optionally, the connection structure includes:

[0012] An oblong positioning groove is provided in the middle of the elongated longitudinal sleeve;

[0013] a first through hole, radially arranged on the first cylinder;

[0014] A screw, the middle portion of which is screwed to the first through hole, and the tail portion of which extends into the oblong positioning groove.

[0015] Optionally, a countersunk hole is provided at one end of the first through hole close to the outer side of the outer sleeve, the head of the screw cooperates with the countersunk hole, and a nylon washer is provided between the head of the screw and the countersunk hole.

[0016] Optionally, the connection structure further includes:

[0017] an open bushing, disposed between the elongated longitudinal sleeve and the outer sleeve, the open bushing being provided with a second axially extending opening, the first opening and the second opening being in communication with each other;

[0018] a second through hole, radially arranged on the first cylinder;

[0019] a compression spring disposed in the second through hole, one end of the compression spring resting against an outer surface of the open bushing;

[0020] An elastic retaining ring is clamped and arranged in the second through hole, and the other end of the compression spring abuts against the elastic retaining ring.

[0021] Optionally, the connection structure further includes a top screw, which is threadedly connected to the second through hole, one end of the top screw rests on the outer surface of the open bushing, and the other end of the top screw is provided with a slot.

[0022] Optionally, the oblong positioning groove is opened at a circumferential length of not less than 1 / 4 of the middle portion of the extended longitudinal sleeve.

[0023] Optionally, the extended longitudinal sleeve and the outer sleeve are made of high-strength alloy structural steel 30CrMnSiA.

[0024] The utility model provides a double-layer sleeve tool capable of avoiding cables, which has the following beneficial effects:

[0025] 1. The socket tool is a manual mechanical operation equipment, does not require the help of power supply, has no restrictions on the working environment, has a wide range of applications, and has great value for popularization and promotion;

[0026] 2. The extended longitudinal sleeve, open bushing and outer sleeve in the sleeve tool can be adjusted in shape and size according to the different shapes of the parts to be installed and removed to meet the needs of different products, which expands the scope of application of the equipment;

[0027] 3. The outer dimensions of the socket tool can also be adjusted in design to meet different production needs.

[0028] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0030] Figure 1 A schematic diagram of the internal structure of a double-layer sleeve tool capable of avoiding cables according to an embodiment of the present utility model is shown.

[0031] Figure 2 Shown Figure 1 AA cross-section diagram.

[0032] Figure 3 A schematic structural diagram of an extended longitudinal sleeve according to an embodiment of the present utility model is shown.

[0033] Figure 4 Shown Figure 3 Cross-sectional view of BB.

[0034] Figure 5 Shown Figure 3 Cross-sectional view of CC.

[0035] Figure 6 A structural schematic diagram of an open bushing according to an embodiment of the utility model is shown.

[0036] Figure 7 Shown Figure 6 Cross-sectional view of DD.

[0037] Figure 8A schematic diagram of the internal and external structures of a jacket according to an embodiment of the present utility model is shown.

[0038] Figure 9 Shown Figure 8 Cross-sectional view of EE.

[0039] Figure 10 A schematic structural diagram of a screw according to an embodiment of the present utility model is shown.

[0040] Figure 11 A structural schematic diagram of a nylon washer according to an embodiment of the present utility model is shown.

[0041] Figure 12 A schematic structural diagram of a compression spring according to an embodiment of the present utility model is shown.

[0042] Figure 13 A schematic structural diagram of a top screw according to an embodiment of the present utility model is shown.

[0043] Description of reference numerals:

[0044] 1. Extended longitudinal sleeve; 2. Open bushing; 3. Outer sleeve; 4. Screw; 5. Nylon washer; 6. Compression spring; 7. Elastic circlip; 8. First opening; 9. First cylinder; 10. Second cylinder; 11. Knurling; 12. Oblong positioning groove; 13. First through hole; 14. Countersunk hole; 15. Second opening; 16. Second through hole; 17. Top screw. DETAILED DESCRIPTION

[0045] The following describes preferred embodiments of the present invention in greater detail. Although preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0046] The utility model provides a double-layer sleeve tool capable of avoiding cables, comprising:

[0047] An extended longitudinal sleeve is inserted into the outer sleeve, the inner circumference of the extended longitudinal sleeve matches the outer circumference of the end part of the cable, one end of the extended longitudinal sleeve extends to the outside of the outer sleeve, the outer circumference of one end of the extended longitudinal sleeve is polygonal, and the extended longitudinal sleeve and the outer sleeve are respectively provided with axially extending first openings, the first opening connecting the interior of the extended longitudinal sleeve with the exterior of the outer sleeve;

[0048] The connecting structure is arranged between the extended longitudinal sleeve and the outer sleeve.

[0049] Specifically, the sleeve tool is configured with an inner and outer two-layer structure, namely an inner extended longitudinal sleeve and an outer jacket. The extended longitudinal sleeve and the outer jacket are integrally connected through a connecting structure. In this way, after the extended longitudinal sleeve is clamped and connected to the end parts of the cable through the inner wall, the end parts of the cable can be threadedly connected to the deep groove structure of the equipment by rotating the outer jacket, so that the cable can be avoided. In addition, the extended longitudinal sleeve is inserted into the interior of the outer jacket, but one end of the extended longitudinal sleeve is outside the outer jacket. A wrench or other tool is used to apply force to the polygonal end, thereby driving the end parts of the cable to reach the standard installation torque.

[0050] Optionally, the outer circumference of the other end of the extended longitudinal sleeve is cylindrical, the radial dimension of the middle part of the extended longitudinal sleeve is larger than the radial dimensions of the two ends of the extended longitudinal sleeve, and the other end and the middle part of the extended longitudinal sleeve are located inside the outer sleeve.

[0051] Optionally, the sleeve includes a first cylinder and a second cylinder arranged in a central position, the radial dimension of the first cylinder is larger than the radial dimension of the second cylinder, and connecting circular holes of equal diameter are provided through the first cylinder and the second cylinder, the connecting circular holes cooperate with the other end and the middle part of the extended longitudinal sleeve, and the middle end face of the extended longitudinal sleeve is clamped with the end face of the second cylinder.

[0052] Specifically, the outer circumference of the part of the extended longitudinal sleeve inserted into the outer sleeve is cylindrical, and the outer circumferential shape of this part of the extended longitudinal sleeve matches the inner circumferential shape of the outer sleeve, which facilitates the installation of the two. In addition, the middle part of the extended longitudinal sleeve is designed to be a raised part relative to the two end parts, so that after the extended longitudinal sleeve is inserted into the outer sleeve, the two can be snap-connected and fixed, and after the two are installed, the end of the extended longitudinal sleeve with a polygonal outer circumference can be completely exposed outside the outer sleeve, which is convenient for locking and fixing the end parts of the cable by tools such as wrenches.

[0053] Optionally, the outer surface of the first cylinder is knurled.

[0054] Specifically, the cross-sectional area of ​​the first cylinder is larger than that of the second cylinder, and the first cylinder is located in the middle of the entire sleeve tool, so that there is a certain distance between the first cylinder and the deep groove structure of the equipment. The sleeve tool can be manually rotated to drive the installation, and the knurling can increase the friction of manual installation.

[0055] Optionally, the connection structure includes:

[0056] An oblong positioning groove is provided in the middle of the extended longitudinal sleeve;

[0057] A first through hole is radially arranged on the first cylinder;

[0058] The middle portion of the screw is screwed into the first through hole, and the tail portion of the screw extends into the oblong positioning groove.

[0059] Optionally, the oblong positioning groove is opened in the middle part of the extended longitudinal sleeve in the circumferential direction for a length of not less than 1 / 4.

[0060] Specifically, an oblong positioning groove greater than 1 / 4 of the circumference is provided along the circumferential direction of the outer circumference of the extended longitudinal sleeve, and a screw is provided through the outer sleeve. The screw is threadedly connected to the first cylindrical body of the outer sleeve, and the tail of the screw extends into the oblong positioning groove. When the extended longitudinal sleeve is rotated by a wrench, the extended longitudinal sleeve and the outer sleeve are prevented from being misaligned by a large angle, thereby achieving synchronous rotation of the two. When connecting the end piece of the cable to the deep groove structure of the equipment, the first cylindrical body of the outer sleeve is first manually rotated. After manual tightening, the polygonal end of the extended longitudinal sleeve is then rotated by a wrench. At this time, only a small rotation angle is required to meet the tightening torque, and the rotation angle generally does not exceed 90 degrees. This connection structure between the tail of the screw and the oblong positioning groove can also prevent the sleeve tool from applying excessive torque to the cable installation, which may cause the cable end piece and the deep groove structure of the equipment to break. As long as the wrench rotates the extended longitudinal sleeve and the outer sleeve is found to be rotating, the wrench can be stopped.

[0061] Optionally, a countersunk hole is provided at one end of the first through hole close to the outer side of the outer sleeve, the head of the screw matches the countersunk hole, and a nylon washer is provided between the head of the screw and the countersunk hole.

[0062] Specifically, in addition to opening a first through hole on the first cylinder of the outer sleeve, a countersunk hole is also opened on the first cylinder to facilitate manual rotation of the outer sleeve. The countersunk hole is concentrically arranged with the first through hole. When the tail of the screw is inserted into the oblong positioning groove, the head of the screw can completely enter the countersunk hole. Nylon washers are also provided at the head of the screw and the bottom of the countersunk hole to ensure clearance fit. In this way, there is no relatively raised part on the outer circumferential surface of the first cylinder, which facilitates manual rotation of the outer sleeve.

[0063] Optionally, the connection structure further includes:

[0064] An open bushing is provided between the extended longitudinal sleeve and the outer sleeve, and an axially extending second opening is provided on the open bushing, and the first opening and the second opening are communicated with each other;

[0065] a second through hole, radially arranged on the first cylinder;

[0066] a compression spring disposed in the second through hole, one end of the compression spring resting against an outer surface of the open bushing;

[0067] The elastic retaining ring is clamped and arranged in the second through hole, and the other end of the compression spring abuts against the elastic retaining ring.

[0068] Specifically, an open bushing is provided on the outer periphery of the extended longitudinal sleeve and the inner periphery of the outer sleeve to avoid wear when the extended longitudinal sleeve and the outer sleeve move relative to each other. A second opening is provided on the open bushing relative to the first opening. When the cable is installed through the sleeve tool, the first opening and the second opening are aligned to facilitate the cable to enter the interior of the sleeve tool through the opening, thereby achieving cable avoidance. A second through hole is also provided on the outer sleeve, and the compression spring and the elastic retaining ring are installed in the second through hole, so that the elastic retaining ring is clamped in the second through hole and supports one end of the compression spring. The other end of the compression spring rests on the open bushing, so that the open bushing and the extended longitudinal sleeve fit more closely, providing a certain damping for the rotation of the extended longitudinal sleeve and reducing the movement between the extended longitudinal sleeve and the open bushing.

[0069] Optionally, the connection structure further includes a top screw, which is threadedly connected to the second through hole, one end of the top screw rests on the outer surface of the open bushing, and the other end of the top screw is provided with a slot.

[0070] Specifically, a top screw can also be used to replace the compression spring and the elastic retaining ring, and the top screw is screwed to the second through hole. The top screw is rotated through the slot to control the pressing force between the top screw and the open bushing, so that the open bushing and the extended longitudinal sleeve fit closer, which can also reduce the movement between the extended longitudinal sleeve and the open bushing.

[0071] Optionally, the material of the extended longitudinal sleeve and the outer sleeve is high-strength alloy structural steel 30CrMnSiA.

[0072] Specifically, the extended longitudinal sleeve and outer jacket are made of high-strength alloy structural steel 30CrMnSiA. After tempering heat treatment, the hardness reaches 36-40HRC, and the surface is blackened to increase the strength of the extended longitudinal sleeve and outer jacket, ensuring that the sleeve tool can transfer the torque value to the end parts of the cable.

[0073] Example

[0074] like Figures 1 to 13 As shown, the utility model provides a double-layer sleeve tool capable of avoiding cables, comprising:

[0075] The extended longitudinal sleeve 1 is inserted into the outer sleeve 3. The inner circumference of the extended longitudinal sleeve 1 matches the outer circumference of the end part of the cable. One end of the extended longitudinal sleeve 1 extends to the outside of the outer sleeve 3. The outer circumference of one end of the extended longitudinal sleeve 1 is polygonal. The extended longitudinal sleeve 1 and the outer sleeve 3 are correspondingly provided with axially extending first openings 8. The first openings 8 connect the interior of the extended longitudinal sleeve 1 with the exterior of the outer sleeve 3.

[0076] The connecting structure is arranged between the extended longitudinal sleeve 1 and the outer sleeve 3.

[0077] In this embodiment, the outer circumference of the other end of the extended longitudinal sleeve 1 is cylindrical, the radial dimension of the middle part of the extended longitudinal sleeve 1 is larger than the radial dimension of the two ends of the extended longitudinal sleeve 1, and the other end and the middle part of the extended longitudinal sleeve 1 are located inside the outer sleeve 3.

[0078] In this embodiment, the outer sleeve 3 includes a first cylinder 9 and a second cylinder 10 arranged in a central manner. The radial dimension of the first cylinder 9 is larger than the radial dimension of the second cylinder 10. A connecting circular hole 11 is provided through the first cylinder 9 and the second cylinder 10. The connecting circular hole 11 cooperates with the other end and the middle part of the extended longitudinal sleeve 1, and the middle end face of the extended longitudinal sleeve 1 is clamped with the end face of the second cylinder 10.

[0079] In this embodiment, the outer surface of the first cylinder 9 is a knurled pattern 11 .

[0080] In this embodiment, the connection structure includes:

[0081] An oblong positioning groove 12 is provided in the middle of the extended longitudinal sleeve 1;

[0082] A first through hole 13 is radially provided on the first cylindrical body 9;

[0083] The middle portion of the screw 4 is screwed into the first through hole 13 , and the tail portion of the screw 4 extends into the oblong positioning groove 12 .

[0084] In this embodiment, a countersunk hole 14 is provided at one end of the first through hole 13 close to the outer side of the outer sleeve. The head of the screw 4 matches the countersunk hole 14 , and a nylon washer 5 is provided between the head of the screw 4 and the countersunk hole 14 .

[0085] In this embodiment, the connection structure further includes:

[0086] The open bushing 2 is provided between the extended longitudinal sleeve 1 and the outer sleeve 3. The open bushing 2 is provided with an axially extending second opening 15. The first opening 8 and the second opening 15 are in communication with each other.

[0087] A second through hole 16 is radially provided on the first cylindrical body 9;

[0088] A compression spring 6 is disposed in the second through hole 16 , with one end of the compression spring 6 resting against the outer surface of the open bushing 2 ;

[0089] The elastic circlip 7 is clamped and disposed in the second through hole 16 , and the other end of the compression spring 6 abuts against the elastic circlip 7 .

[0090] In this embodiment, a jackscrew 17 can be used in place of the compression spring 6 and the circlip 7. The jackscrew 17 is threadedly connected to the second through hole 16. One end of the jackscrew 17 abuts against the outer surface of the open bushing 2, and the other end of the jackscrew 17 is provided with a slotted groove. The jackscrew 17 is cylindrical and made of H62 copper. The external thread is set to M4 and the length is 6 mm. The slotted groove is designed with a depth of 1.5 mm and a width of 1.2 mm, which facilitates installation of the jackscrew 17 with a slotted screwdriver.

[0091] In this embodiment, the length of the oblong positioning groove 12 in the circumferential direction of the middle portion of the extended longitudinal sleeve 1 is not less than 1 / 4.

[0092] In this embodiment, the material of the extended longitudinal sleeve 1 and the outer sleeve 3 is high-strength alloy structural steel 30CrMnSiA.

[0093] In summary, in this sleeve tool, the total length of the extended longitudinal sleeve 1 is 90mm. It is made of high-strength alloy structural steel 30CrMnSiA. After tempering heat treatment, the hardness reaches 36-40HRC and the surface is blackened. The interior is designed with an inner hexagonal through hole with a size of 14mm, which can be docked with the end parts of the cable to realize installation and disassembly operations. The extended longitudinal sleeve 1 has three sections with different diameters. The left end is a 60mm long open cylinder with an outer diameter of 19mm, and the right end is a 15mm long open hexagonal prism with an outer dimension of 20mm. The first opening 8 is axially through on the extended longitudinal sleeve 1, with an opening size of 5mm, which is used for the cable to be smoothly placed in the inner hexagonal through hole through the through slot. The outer periphery of the middle section is designed with an oblong positioning groove 12, the groove length is one-quarter of the circumference, the width is 7.5mm, and the depth is 2mm.

[0094] The total length of the outer sleeve 3 is 75 mm, and it is designed with an axial cylindrical through hole with an inner diameter of outer diameter The cylindrical through hole can be matched with the extended longitudinal sleeve 1 to increase the rigidity of the extended longitudinal sleeve 1 when it rotates. The outer sleeve 3 is also provided with a first opening 8 with an opening size of 5mm to facilitate the passage of the cable. The outer surface of the outer sleeve 3 has a mesh knurling 11 with a length of 7.5mm and an outer diameter of inner diameter This prevents the handheld rotating jacket 3 from slipping. first through hole 13 and The second through holes 16 form an angle of 135 degrees with their center lines coplanar.

[0095] An open bushing 3 is provided between the extended longitudinal sleeve 1 and the outer sleeve 3. The material is H62 copper with an inner diameter of outer diameter The width is 15mm, and the open bushing 3 can prevent wear when the extended longitudinal sleeve 1 and the outer sleeve 3 move relative to each other; the open bushing 3 is designed with a second opening 15 with an opening width of 5mm to facilitate the passage of cables.

[0096] The screw 4 is screwed into the first through hole 13 and extends to the oblong positioning groove 12 to limit the circumferential position of the extended longitudinal sleeve 1 in the outer sleeve 3; the screw 4 is a fastener made of H62 copper and is used to achieve a tight fit between the open bushing 2 and the outer sleeve 3.

[0097] A compression spring 6 is provided in the second through hole 16. The spring is made of 65Mn and is formed by cold bending process. The outer diameter is The effective number of turns n=3, the inner end of the compression spring 6 presses on the open bushing 2, and the outer end presses on the elastic retaining ring 7. The compression spring 6 can provide a certain damping for the rotation of the extended longitudinal sleeve 1, reducing the movement of the extended longitudinal sleeve 1 and the open bushing 2.

[0098] The process of installing the end parts of the cable with the sleeve tool is as follows:

[0099] (1) The cable enters the interior of the extended longitudinal sleeve 1 through the first opening 8 and the second opening 15;

[0100] (2) The inner circumference of the left end of the extended longitudinal sleeve 1 is connected to the end part of the cable. Hold the first cylinder 9 with your left hand and the cable with your right hand, slowly put the part into the installation position, and rotate the outer sleeve 3 to tighten the part;

[0101] (3) The torque wrench is fixed to the polygonal surface on the right end of the extended longitudinal sleeve 1;

[0102] (4) Hold the outer sleeve 3 with your left hand and rotate the open-end torque wrench with your right hand until the specified torque is reached.

[0103] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A double-layer sleeve tool capable of avoiding cables, characterized in that: include: An extended longitudinal sleeve is inserted into the outer sleeve, the inner circumference of the extended longitudinal sleeve matches the outer circumference of the end part of the cable, one end of the extended longitudinal sleeve extends to the outside of the outer sleeve, the outer circumference of one end of the extended longitudinal sleeve is polygonal, and the extended longitudinal sleeve and the outer sleeve are respectively provided with axially extending first openings, and the first opening connects the interior of the extended longitudinal sleeve with the exterior of the outer sleeve; A connecting structure is provided between the elongated longitudinal sleeve and the outer sleeve.

2. The double-layer sleeve tool capable of avoiding cables according to claim 1, characterized in that: The outer circumference of the other end of the extended longitudinal sleeve is cylindrical, the radial dimension of the middle part of the extended longitudinal sleeve is larger than the radial dimensions of the two ends of the extended longitudinal sleeve, and the other end and the middle part of the extended longitudinal sleeve are located inside the outer sleeve.

3. The double-layer sleeve tool capable of avoiding cables according to claim 2, characterized in that: The outer sleeve includes a first cylinder and a second cylinder arranged in a central position, the radial dimension of the first cylinder is larger than the radial dimension of the second cylinder, and the first cylinder and the second cylinder are penetrated by connecting circular holes of equal diameter, the connecting circular holes cooperate with the other end and the middle part of the extended longitudinal sleeve, and the middle end face of the extended longitudinal sleeve is clamped with the end face of the second cylinder.

4. The double-layer sleeve tool capable of avoiding cables according to claim 3, characterized in that: The outer surface of the first cylinder is knurled.

5. The double-layer sleeve tool capable of avoiding cables according to claim 3, characterized in that: The connection structure includes: An oblong positioning groove is provided in the middle of the elongated longitudinal sleeve; a first through hole, radially arranged on the first cylinder; A screw, the middle portion of which is screwed to the first through hole, and the tail portion of which extends into the oblong positioning groove.

6. The double-layer sleeve tool capable of avoiding cables according to claim 5, characterized in that: A countersunk hole is provided at one end of the outer side of the first through hole close to the outer sleeve, the head of the screw matches the countersunk hole, and a nylon washer is provided between the head of the screw and the countersunk hole.

7. The double-layer sleeve tool capable of avoiding cables according to claim 5, characterized in that: The connection structure further includes: an open bushing, disposed between the elongated longitudinal sleeve and the outer sleeve, the open bushing being provided with a second axially extending opening, the first opening and the second opening being in communication with each other; a second through hole, radially arranged on the first cylinder; a compression spring disposed in the second through hole, one end of the compression spring resting against an outer surface of the open bushing; An elastic retaining ring is clamped and arranged in the second through hole, and the other end of the compression spring abuts against the elastic retaining ring.

8. The double-layer sleeve tool capable of avoiding cables according to claim 7, characterized in that: The connection structure further includes a top screw, which is threadedly connected to the second through hole. One end of the top screw rests on the outer surface of the open bushing, and the other end of the top screw is provided with a slot.

9. The double-layer sleeve tool capable of avoiding cables according to claim 5, characterized in that: The length of the oblong positioning groove in the circumferential direction of the middle part of the extended longitudinal sleeve is not less than 1 / 4.

10. The double-layer sleeve tool capable of avoiding cables according to claim 1, characterized in that: The extended longitudinal sleeve and the outer sleeve are made of high-strength alloy structural steel 30CrMnSiA.

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