Sleeve extension bar

Abstract

The sleeve lengthening rod comprises a first lining rod, a second lining rod and a positioning piece, a first connecting part used for being matched with a sleeve is arranged at one end of the first lining rod, a positioning hole is formed in the outer surface of the first lining rod, and a second connecting part used for being matched with a wrench is arranged at one end of the second lining rod; the outer surface of the second lining rod is provided with a plurality of fixing holes arranged at intervals in the length direction of the second lining rod, the positioning piece comprises an elastic piece and a positioning block, the elastic piece and the positioning block are arranged in the positioning hole, one end of the elastic piece is connected with the hole wall of the positioning hole, and the other end of the elastic piece is connected with the hole wall of the positioning hole. The end, away from the elastic piece, of the positioning block can penetrate out of the positioning hole and be inserted into one fixing hole under the action of the elastic piece. The length of the sleeve lengthening rod can be adjusted according to actual requirements so as to meet the requirements of disassembly and assembly objects with different space distances.

Description

Technical Field

[0001] The present application relates to the technical field of auxiliary maintenance tools, and in particular to a sleeve extension rod. Background Art

[0002] At present, most of the various parts of the car are fixed by bolts or nuts to achieve their functions such as fastening and sealing. Therefore, when performing vehicle analysis or repair work, it is necessary to loosen or tighten the bolts or nuts of the parts to achieve disassembly and installation. Generally, the sleeve usually needs to be used with a sleeve extension rod so that the sleeve can disassemble or install bolts in different spatial positions.

[0003] However, since the length of the current sleeve extension rod is fixed, when the length of the sleeve extension rod is not compatible with the spatial position distance of the bolt, the bolt will be unable to be disassembled or more parts will need to be disassembled to obtain more disassembly space, which is not conducive to improving work efficiency and even increases the possibility of quality risks. Utility Model Content

[0004] Based on this, it is necessary to provide a sleeve extension rod to address the above problems. The length of the sleeve extension rod can be adjusted according to actual conditions to meet the requirements of different spatial distances of disassembly and assembly objects, thereby achieving convenient disassembly and assembly of different parts and reducing quality risks caused by disassembly and assembly of more parts.

[0005] The technical solution is as follows:

[0006] A sleeve extension rod, comprising:

[0007] A first lining rod, one end of which is provided with a first connecting portion, the first connecting portion being used to cooperate with the sleeve; a positioning hole is provided on the outer surface of the first lining rod;

[0008] A second lining rod, wherein one end of the second lining rod is provided with a second connecting portion for cooperating with a wrench, and the other end is provided with an adjustment hole extending along the length direction of the second lining rod, and the end of the first lining rod away from the first connecting portion is slidably inserted into the adjustment hole, and the outer surface of the second lining rod is provided with a plurality of fixing holes, and the plurality of fixing holes are arranged at intervals along the length direction of the second lining rod and are all connected to the adjustment hole;

[0009] A positioning member, the positioning member includes an elastic member and a positioning block, the elastic member is arranged in the positioning hole, the positioning block is movably arranged in the positioning hole, one end of the elastic member is connected to the hole wall of the positioning hole, and the other end is connected to one end of the positioning block, and the end of the positioning block that is away from the elastic member can pass through the positioning hole and be inserted into one of the fixing holes under the action of the elastic member.

[0010] In the above-mentioned sleeve extension rod, since the first connecting portion can be adapted to the sleeve, the second connecting portion can be adapted to the wrench, and the second liner rod is movably sleeved on the outer periphery of the first liner rod, the second liner rod can adjust the length of the sleeve extension rod by sliding relative to the first liner rod, so that the sleeve extension rod can disassemble or install the disassembly object at different spatial distances. Also, since the second liner rod is provided with a plurality of fixing holes arranged along its length direction, the fixing holes of the first liner rod are provided with movable positioning blocks, and the positioning blocks can be inserted into one of the fixing holes under the action of the elastic member, so the positioning blocks can lock the first liner rod and the second liner rod by being inserted into the fixing holes. Furthermore, during the process of the second liner rod sliding relative to the first liner rod, the sleeve extension rod can be stably maintained at different lengths by inserting the positioning blocks into different fixing holes, so that the sleeve extension rod can reliably perform its function during disassembly or installation. Therefore, the sleeve extension rod can adjust its length according to actual needs to meet the requirements of disassembly and assembly objects at different spatial distances, effectively avoiding the situation where bolts cannot be disassembled or installed, or more parts need to be disassembled to obtain more disassembly and assembly space, ensuring disassembly and repair and reducing the quality risks caused by disassembling and installing more parts. The technical solution will be further described below:

[0011] In one embodiment, the number of the positioning holes is at least two, at least two of the positioning holes are spaced apart in the circumferential direction of the first liner rod, the plurality of fixing holes form a first row of holes, the outer surface of the second liner rod is provided with at least two of the first rows of holes, at least two of the first rows of holes are spaced apart in the circumferential direction of the second liner rod, at least two of the first rows of holes are arranged in one-to-one correspondence with at least two of the positioning holes, each of the positioning holes is provided with the positioning member, and the positioning blocks in each of the positioning holes can be inserted into one of the fixing holes of the corresponding first row of holes.

[0012] In one embodiment, two adjacent positioning holes are spaced apart in the length direction of the first liner rod, and the fixing holes of two adjacent first rows of holes are staggered along the length direction of the second liner rod.

[0013] In one embodiment, the plurality of fixing holes in the first row of holes are evenly spaced along the length direction of the second liner rod.

[0014] In one embodiment, both the number of the positioning holes and the number of the first rows of holes are two.

[0015] In one embodiment, the cross-section of the first lining rod and the cross-section of the adjusting hole are both polygonal, and the first lining rod is adapted to the adjusting hole. The first lining rod has a first side surface and a second side surface that are not coplanar. One of the two positioning holes is opened on the first side surface, and the other of the two positioning holes is opened on the second side surface.

[0016] In one embodiment, the cross-section of the first lining rod and the cross-section of the adjusting hole are both quadrilateral.

[0017] In one embodiment, the cross-section of the positioning block is circular.

[0018] In one embodiment, the diameter of the positioning block gradually decreases from one end close to the elastic member to the other end.

[0019] In one embodiment, a limiting hole is formed in the outer surface of the second connecting portion. A limiting member is arranged in the limiting hole. The limiting member includes a limiting protrusion, an elastic pressing member and a limiting ring. The limiting protrusion is movably arranged in the limiting hole. The elastic pressing member is arranged in the limiting hole. One end of the elastic pressing member is connected to the hole wall of the limiting hole, and the other end is connected to the limiting protrusion. The limiting protrusion can protrude from the outer surface of the second connecting portion under the action of the elastic pressing member. The limiting protrusion is used for abutting against the wrench. The limiting ring is fixed in the limiting hole and sleeved on the outer periphery of the limiting protrusion. The limiting ring is used for limiting the limiting protrusion in the limiting hole. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a sleeve extension rod in an embodiment.

[0021] Figure 2 It is a partial sectional structural schematic diagram when the positioning block locks the first lining rod and the second lining rod in an embodiment.

[0022] Figure 3 It is a partial sectional structural schematic diagram at the second connecting member in an embodiment.

[0023] Description of the Reference Numerals:

[0024] 100, sleeve extension rod; 1, first connecting portion; 11, connecting groove; 2, first lining rod; 21, first side surface; 23, positioning hole; 22, second side surface; 3, second lining rod; 31, fixing hole; 32, first hole row; 4, second connecting portion; 41, limiting hole; 5, positioning member; 51, elastic member; 52, positioning block; 6, limiting member; 61, limiting ring; 62, limiting protrusion; 63, elastic pressing member. Detailed Description of the Embodiments

[0025] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0027] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] In the present application, unless otherwise clearly specified and limited, if terms such as "install", "connect", "link", "fix", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0031] See also Figures 1 to 2 , a sleeve extension rod 100 provided in one embodiment of the present application includes a first lining rod 2, a second lining rod 3 and a positioning member 5, wherein:

[0032] A first connecting portion 1 is provided at one end of the first lining rod 2, and the first connecting portion 1 is used to cooperate with the sleeve. A positioning hole 23 is provided on the outer surface of the first lining rod 2, a second connecting portion 4 for cooperating with a wrench is provided at one end of the second lining rod 3, and an adjustment hole extending along the length direction of the second lining rod 3 is provided at the other end. The end of the first lining rod 2 away from the first connecting portion 1 can be slidably inserted into the adjustment hole, and a plurality of fixing holes 31 are provided on the outer surface of the second lining rod 3. The plurality of fixing holes 31 are arranged at intervals along the length direction of the second lining rod 3 and are all connected to the adjustment hole. The positioning member 5 includes an elastic member 51 and a positioning block 52. The elastic member 51 is provided in the positioning hole 23, and the positioning block 52 is movably provided in the positioning hole 23. One end of the elastic member 51 is connected to the hole wall of the positioning hole 23, and the other end is connected to one end of the positioning block 52. The end of the positioning block 52 away from the elastic member 51 can pass through the positioning hole 23 and be inserted into one of the fixing holes 31 under the action of the elastic member 51.

[0033] In the above-mentioned sleeve extension rod 100, since the first connecting portion 1 can be adapted to the sleeve, the second connecting portion 4 can be adapted to the wrench, and the second liner rod 3 is movably sleeved on the outer periphery of the first liner rod 2, the second liner rod 3 can adjust the length of the sleeve extension rod 100 by sliding relative to the first liner rod 2, so that the sleeve extension rod 100 can disassemble or install a disassembly object at different spatial distances. Also, since the second liner rod 3 is provided with a plurality of fixing holes 31 arranged along its length direction, the fixing holes 31 of the first liner rod 2 are provided with movable positioning blocks 52, and the positioning blocks 52 can be inserted into one of the fixing holes 31 under the action of the elastic member 51, the positioning blocks 52 can lock the first liner rod 2 and the second liner rod 3 by being inserted into the fixing holes 31. Furthermore, during the process of the second liner rod 3 sliding relative to the first liner rod 2, the sleeve extension rod 100 can be stably maintained at different lengths by inserting the positioning blocks 52 into different fixing holes 31, so that the sleeve extension rod 100 can reliably perform its function during disassembly or installation. Therefore, the sleeve extension rod 100 can adjust its length according to actual needs to meet the requirements of disassembly and assembly objects at different spatial distances, effectively avoiding the situation where bolts cannot be disassembled or installed or more parts need to be disassembled to obtain more disassembly and assembly space, ensuring disassembly and repair and reducing the quality risks caused by disassembling and installing more parts.

[0034] Schematically, at one end of the first connecting portion 1 facing away from the first liner rod 2, a connecting groove 11 is formed, and the connecting groove 11 is used for mating connection with the sleeve.

[0035] Schematically, as Figure 1 shown, the first connecting portion 1 is a cylinder with a diameter of 23 mm and a length of 24 mm. The cross-sectional shape of the connecting groove 11 is a square, and the side length of the square is 13 mm. The depth of the connecting groove 11 is 17 mm.

[0036] Furthermore, in one embodiment, in combination with Figure 1 and Figure 2As shown, the number of positioning holes 23 is at least two. At least two positioning holes 23 are arranged at intervals in the circumferential direction of the first lining rod 2. A plurality of fixing holes 31 form a first row of holes 32. At least two first rows of holes 32 are formed on the outer surface of the second lining rod 3. At least two first rows of holes 32 are arranged at intervals in the circumferential direction of the second lining rod 3. At least two first rows of holes 32 are arranged in one-to-one correspondence with at least two positioning holes 23. A positioning member 5 is arranged in each positioning hole 23. The positioning block 52 in each positioning hole 23 can be inserted into one of the fixing holes 31 of the corresponding first row of holes 32. In this way, since at least two positioning holes 23 are arranged at intervals in the circumferential direction and the fixing holes 31 are arranged in one-to-one correspondence with the first row of holes 32, a plurality of positioning blocks 52 can lock the second lining rod 3 in a plurality of different directions at the same time, which is beneficial to ensuring the balance of the second lining rod 3. In addition, since it is necessary to unlock the locking of the second lining rod 3 by a plurality of positioning blocks 52 synchronously to slide the second lining rod 3, this design effectively avoids the situation that the second lining rod 3 slides due to accidentally touching one positioning block 52, and effectively improves the stability of the sleeve extension rod 100 during operation.

[0037] Further, in one embodiment, as Figure 1 shown, two adjacent positioning holes 23 are arranged at intervals in the length direction of the first lining rod 2, and the fixing holes 31 of two adjacent first rows of holes 32 are arranged staggeredly in the length direction of the second lining rod 3. In this way, a plurality of positioning holes 23 do not interfere with each other, so that the elastic member 51 and the positioning block 52 can be reliably installed in the positioning holes 23. In addition, when the positioning block 52 is inserted into the fixing hole 31, the convex portions of a plurality of positioning blocks 52 can be spaced not only in the circumferential direction of the first lining rod 2 but also in the length direction, which effectively avoids the situation of accidentally touching a plurality of limiting members 6 at the same time to unlock the second lining rod 3, and effectively improves the stability of the sleeve extension rod 100 during operation.

[0038] Further, in one embodiment, as Figure 1 shown, a plurality of fixing holes 31 in the first row of holes 32 are evenly spaced in the length direction of the second lining rod 3. In this way, every time the position of the second lining rod 3 is adjusted, the length of the current extension rod can be quickly obtained, which is beneficial to improving the operation efficiency. Schematically, the distance between two adjacent positioning holes 23 is 20 mm.

[0039] Schematically, in other embodiments, the distance between the positioning holes 23 in the same first row of holes 32 can also be increased or decreased in sequence.

[0040] Schematically, the number of positioning holes 23 in the first row of holes 32 can be designed as required. For example, it can be two, three or more. Preferably, the number of positioning holes 23 in the first row of holes 32 is five.

[0041] Further, in one embodiment, the number of positioning holes 23 and the number of the first row of holes 32 are both two. In this way, not only can the unlocking of the first lining rod 2 and the second lining rod 3 due to accidental touch be effectively avoided, improving the connection stability of the sleeve extension rod 100, but also the efficiency of unlocking the first lining rod 2 and the second lining rod 3 can be ensured, thus facilitating the improvement of the operation speed.

[0042] Further, in one embodiment, as Figure 1 shown, the cross-sections of the first lining rod 2 and the adjusting hole are both polygons, and the first lining rod 2 is adapted to the adjusting hole. The first lining rod 2 has a first side surface 21 and a second side surface 22 that are not coplanar. One of the two positioning holes 23 is opened on the first side surface 21, and the other of the two positioning holes 23 is opened on the second side surface 22. In this way, during the process of adjusting the length of the sleeve extension rod 100, the rotation of the first lining rod 2 relative to the second lining rod 3 can be restricted by the cooperation between the outer surface of the first lining rod 2 and the inner wall of the adjusting hole, so that the positioning block 52 can be reliably inserted into the corresponding fixing hole 31, thereby effectively ensuring the reliability of the sleeve extension rod 100. Among them, by respectively arranging the two positioning holes 23 on two non-coplanar side surfaces, the two positioning holes 23 can be effectively spaced apart, thus ensuring the strength of the first lining rod 2.

[0043] Preferably, as Figure 1 shown, the cross-sections of the first lining rod 2 and the adjusting hole are both quadrilaterals. In this way, not only can the rotation of the first lining rod 2 relative to the second lining rod 3 be restricted by the cooperation between the outer surface of the first lining rod 2 and the inner wall of the adjusting hole, but also the first lining rod 2 and the second lining rod 3 can be quickly assembled in alignment.

[0044] Schematically, as Figure 1 shown, the first side surface 21 and the second side surface 22 are adjacent to each other in the circumferential direction of the first lining rod 2. In this way, it is beneficial to conveniently unlock the two positioning blocks 52 synchronously so that the length of the sleeve extension rod 100 can be conveniently adjusted. Further, the depth directions of the two positioning holes 23 are perpendicular to each other.

[0045] In one embodiment, as Figure 2 shown, the cross-section of the positioning block 52 is circular. In this way, the positioning block 52 is cylindrical, which enables the positioning block 52 to be conveniently inserted into the corresponding fixing hole 31 without alignment, contributing to the convenient adjustment of the length of the sleeve extension rod 100.

[0046] Preferably, as Figure 2As shown, the diameter of the positioning block 52 gradually decreases from one end close to the elastic member 51 to the other end. In this way, when the second liner rod 3 is slid, the positioning block 52 can be quickly inserted into the corresponding fixing hole 31 under the action of the elastic member 51 to lock the first liner rod 2 and the second liner rod 3.

[0047] Schematically, the cross-section of the first liner rod 2 is a square with a side length of 8 mm, and the length of the first liner rod 2 is 120 mm. The diameter of the positioning hole 23 is 3 mm, and the depth of the positioning hole 23 is 5 mm. In the length direction of the first liner rod 2, the distance between two adjacent positioning holes 23 is 10 mm.

[0048] Schematically, the elastic member 51 is a spring. Further, the length of the spring is 2.5 mm, and the outer diameter is 2.95 mm. The diameter of one end of the positioning block 52 close to the elastic member 51 is 2.95, the diameter of the other end is 2.7 mm, and the length is 2.5 mm.

[0049] Schematically, as Figure 1 shown, the second liner rod 3 is a cylinder, and its diameter is 16.2 mm and the length is 100 mm. The side length of the adjustment hole is 8.1 mm and the depth is 90 mm. The diameter of the positioning hole 23 is 2.8 mm and the depth is 15 mm.

[0050] In one embodiment, as Figure 1 and Figure 3 shown, a limiting hole 41 is formed on the outer surface of the second connecting portion 4, and a limiting member 6 is arranged in the limiting hole 41. The limiting member 6 includes a limiting protrusion 62, an elastic pressing member 63 and a limiting ring 61. The limiting protrusion 62 is movably arranged in the limiting hole 41. The elastic pressing member 63 is arranged in the limiting hole 41. One end of the elastic pressing member 63 is connected to the hole wall of the limiting hole 41, and the other end is connected to the limiting protrusion 62. The limiting protrusion 62 can protrude from the outer surface of the second connecting portion 4 under the action of the elastic pressing member 63. The limiting protrusion 62 is used for abutting against a wrench. The limiting ring 61 is fixed in the limiting hole 41 and sleeved on the outer periphery of the limiting protrusion 62. The limiting ring 61 is used for restricting the limiting protrusion 62 in the limiting hole 41. In this way, when the second connecting portion 4 cooperates with the wrench to disassemble and assemble the bolt, the limiting protrusion 62 can keep abutting against the wrench under the action of the elastic pressing member 63. Thus, when the wrench drives the socket extension rod 100 through the second connecting portion 4, the limiting protrusion 62 can increase the frictional force between the second connecting portion 4 and the wrench, so that it is not easy for the wrench and the second connecting portion 4 to rotate, ensuring that the second connecting portion 4 is not easy to fall off from the wrench and effectively ensuring the progress of the disassembly work. The setting of the limiting ring 61 can effectively prevent the limiting protrusion 62 from passing out of the opening of the limiting hole 41, so that the limiting protrusion 62 can effectively press the wrench and ensure the connection reliability between the wrench and the second connecting portion 4.

[0051] Preferably, the limiting protrusion 62 is a steel ball. The steel ball not only has relatively high strength and hardness but also has good wear resistance. Therefore, setting the limiting protrusion 62 as a steel ball is beneficial to improving the service life of the sleeve extension rod 100.

[0052] Illustratively, in combination with Figure 1 and Figure 3 as shown, the second connecting portion 4 is a cube with a side length of 10.6 mm and a length of 15 mm. The diameter of the limiting hole 41 is 6 mm and the depth is 7 mm. The length of the elastic pressing member 63 is 2.5, and the outer diameter is 5.8. The outer diameter of the limiting ring 61 is 6.01 mm and the inner diameter is 5.6 mm. The outer diameter of the steel ball is 5.8 mm.

[0053] Illustratively, the elastic pressing member 63 is a spring.

[0054] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0055] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A sleeve extension rod, characterized in that, include: A first lining rod, one end of which is provided with a first connecting portion, the first connecting portion being used to cooperate with the sleeve; a positioning hole is provided on the outer surface of the first lining rod; A second lining rod, wherein one end of the second lining rod is provided with a second connecting portion for cooperating with a wrench, and the other end is provided with an adjustment hole extending along the length direction of the second lining rod, and the end of the first lining rod away from the first connecting portion is slidably inserted into the adjustment hole, and the outer surface of the second lining rod is provided with a plurality of fixing holes, and the plurality of fixing holes are arranged at intervals along the length direction of the second lining rod and are all connected to the adjustment hole; A positioning member, the positioning member includes an elastic member and a positioning block, the elastic member is arranged in the positioning hole, the positioning block is movably arranged in the positioning hole, one end of the elastic member is connected to the hole wall of the positioning hole, and the other end is connected to one end of the positioning block, and the end of the positioning block that is away from the elastic member can pass through the positioning hole and be inserted into one of the fixing holes under the action of the elastic member.

2. The sleeve extension rod according to claim 1, characterized in that, The number of the positioning holes is at least two, at least two of the positioning holes are spaced apart in the circumferential direction of the first liner rod, the multiple fixing holes form a first hole row, the outer surface of the second liner rod is provided with at least two of the first hole rows, at least two of the first hole rows are spaced apart along the circumferential direction of the second liner rod, at least two of the first hole rows are arranged one-to-one with at least two of the positioning holes, each of the positioning holes is provided with the positioning piece, and the positioning block in each of the positioning holes can be inserted into one of the fixing holes in the corresponding first hole row.

3. The sleeve extension rod according to claim 2, wherein, Two adjacent positioning holes are spaced apart in the length direction of the first liner rod, and the fixing holes in two adjacent first hole rows are staggered along the length direction of the second liner rod.

4. The sleeve extension rod according to claim 2 or 3, characterized in that, The plurality of fixing holes in the first hole row are evenly spaced apart along the length direction of the second liner rod.

5. The sleeve extension rod according to claim 2 or 3, characterized in that, The number of the positioning holes and the number of the first hole rows are both two.

6. The sleeve extension rod according to claim 5, wherein The cross-section of the first backing rod and the cross-section of the adjustment hole are both polygonal, and the first backing rod is adapted to the adjustment hole. The first backing rod has a first side surface and a second side surface that are not coplanar. One of the two positioning holes is opened on the first side surface, and the other of the two positioning holes is opened on the second side surface.

7. The sleeve extension rod according to claim 6, wherein The cross-section of the first liner rod and the cross-section of the adjustment hole are both quadrilaterals.

8. The sleeve extension rod according to claim 1, characterized in that, The cross section of the positioning block is circular.

9. The sleeve extension rod according to claim 8, wherein, The diameter of the positioning block gradually decreases from one end close to the elastic member to the other end.

10. The sleeve extension rod according to claim 1, wherein, A limiting hole is formed in the outer surface of the second connecting portion. A limiting member is arranged in the limiting hole. The limiting member includes a limiting protrusion, an elastic pressing member and a limiting ring. The limiting protrusion is movably arranged in the limiting hole. The elastic pressing member is arranged in the limiting hole. One end of the elastic pressing member is connected to the hole wall of the limiting hole, and the other end is connected to the limiting protrusion. The limiting protrusion can protrude from the outer surface of the second connecting portion under the action of the elastic pressing member. The limiting protrusion is used for abutting against the wrench. The limiting ring is fixed in the limiting hole and sleeved on the outer periphery of the limiting protrusion. The limiting ring is used for restricting the limiting protrusion in the limiting hole.

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