Connecting rod of tapper

Abstract

The utility model discloses a tapper connecting rod which comprises a rotating handle assembly and a tapping assembly, the rotating handle assembly comprises a drill bit limiting sleeve and a limiting mechanism, and the tapping assembly comprises a hexagonal center drill and a cylindrical tapper. The limiting mechanism comprises a limiting steel ball and a sliding sleeve; the drill bit limiting sleeve and the cylindrical tapper are detachably connected to form a whole. A limiting hole is formed in the drill bit limiting sleeve; the limiting steel balls are installed in the limiting holes in a matched mode. A positioning groove is formed in the hexagonal center drill. The limiting steel balls are matched with the positioning grooves for limiting; a limiting part is arranged on the inner side wall of the sliding sleeve; the drill bit limiting sleeve is movably sleeved with the sliding sleeve in the axial direction of the drill bit limiting sleeve. And the sliding sleeve axially moves along the drill bit limiting sleeve, so that the limiting part is matched with or separated from the limiting steel ball, and a locking state and an unlocking state are formed, so that the drill bit limiting sleeve and the hexagonal center drill are locked or unlocked. The purpose of rapidly returning waste materials or rapidly replacing the cylindrical tapper is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hole openers, in particular to a hole opener connecting rod. Background Art

[0002] A hole opener is a circular saw that is used to cut circular holes. It can be used to open holes in metal, wood, plastic, glass and other materials. It is easy to operate and carry, and has a wide range of uses.

[0003] The existing hole opener is mainly composed of a rotating handle and a hole opener body. The rotating handle and the hole opener body are generally connected together by threads. If the hole opener body needs to be replaced, the original hole opener screw must be unscrewed first, and then the new hole opener body must be installed. However, since the hole opener body has been drilled, the threads may slip or get stuck, making it difficult to disassemble. It is also difficult to quickly clean out the waste in the hole opener body. Utility Model Content

[0004] The utility model aims to provide a hole opener connecting rod, so that the hexagonal center drill and the cylindrical hole opener can be easily disassembled and pulled out together, so as to realize the purpose of quickly returning waste materials or quickly replacing the cylindrical hole opener.

[0005] The utility model is realized by the following technical solutions:

[0006] A hole opener connecting rod comprises a handle assembly and a hole opener assembly, wherein the upper end of the handle assembly is detachably connected to the hole opener assembly, and the lower end of the handle assembly is connected to a driving assembly to drive the hole opener assembly to rotate; wherein: the handle assembly comprises a drill stop sleeve and a stop mechanism, the hole opener assembly comprises a hexagonal center drill and a cylindrical hole opener; the stop mechanism comprises a stop steel ball and a sliding sleeve; the drill stop sleeve is detachably connected to the cylindrical hole opener to form a whole; a stop mechanism is arranged on the drill stop sleeve A limiting hole; the limiting steel ball is installed in the limiting hole, and a positioning groove is provided on the hexagonal center drill; the limiting steel ball cooperates with the positioning groove to limit; a limiting portion is provided on the inner side wall of the sliding sleeve; the sliding sleeve is movably sleeved on the drill limiting sleeve along the axial direction of the drill limiting sleeve; the sliding sleeve moves axially along the drill limiting sleeve to make the limiting portion cooperate or separate with the limiting steel ball, forming a locked state and an unlocked state so that the drill limiting sleeve and the hexagonal center drill are locked or unlocked.

[0007] As a further improvement on the technical solution of the utility model, a slide groove with an open end is provided on the top of the drill limit sleeve; a pressing assembly is encapsulated on the slide groove through an end cover; the pressing assembly includes a pressing slider, a fixed block and a pressing spring; the fixed block is fixedly installed on the drill slide groove; the pressing slider can be slidably installed on the slide groove; one end of the pressing slider is respectively provided with a first semi-cylindrical mounting portion and a first spring mounting hole; one end of the fixed block is provided with a second semi-cylindrical mounting portion and a second spring mounting hole; the first semi-cylindrical mounting portion is combined with the second semi-cylindrical mounting portion by movement to form a mounting portion that is assembled with the cylindrical hole opener and avoids the hexagonal center drill; one end of the pressing spring is connected to the first spring mounting hole, and the other end is connected to the second spring mounting hole.

[0008] As a further improvement of the technical solution of the utility model, the sliding sleeve is movably mounted on the drill limit sleeve through a reset assembly; the reset assembly includes a reset spring and a reset clamping ring; the upper end of the reset spring abuts against the lower end surface of the limiting portion; the lower end of the reset spring abuts against the circular protrusion at the lower end of the drill limit sleeve; the reset clamping ring is clamped in the upper end groove of the drill limit sleeve; when the reset spring is in a state of natural reset, the top of the sliding sleeve abuts against the reset clamping ring, and the hexagonal center drill is in a locked state.

[0009] As a further improvement on the technical solution of the utility model, the sliding sleeve is movably mounted on the drill limit sleeve through a reset assembly; the reset assembly includes a reset spring, a reset clamp and a reset guide cylinder; the reset guide cylinder is sleeved on the upper end of the drill limit sleeve; the lower end of the reset guide cylinder is connected to the upper end of the sliding sleeve; the upper end of the reset spring abuts against the top inner end surface of the reset guide cylinder; the lower end of the reset spring abuts against the upper end surface of the limiting portion; the reset clamp is clamped in the lower end groove of the drill limit sleeve; when the reset spring is naturally reset, the bottom of the sliding sleeve abuts against the reset clamp, and the hexagonal center drill is in a locked state.

[0010] As a further improvement of the technical solution of the utility model, positioning pin holes are symmetrically arranged on the top of the sliding sleeve; and positioning pins passing through the cylindrical hole opener are inserted into the positioning pin holes.

[0011] As a further improvement of the technical solution of the utility model, an arc-shaped pressing portion is provided at the other end of the pressing slider.

[0012] As a further improvement of the technical solution of the utility model, the cylindrical hole opener is detachably connected to the drill bit limiting sleeve via a converter.

[0013] As a further improvement of the technical solution of the utility model, the pressing slider, the fixing block and the end cover are all provided with through holes for the positioning pin to pass through.

[0014] As a further improvement of the technical solution of the utility model, the end cover is packaged on the top of the drill limit sleeve by rivets.

[0015] As a further improvement of the technical solution of the utility model, a chip removal groove is provided on the side wall of the cylindrical hole opener.

[0016] In summary, the utility model has the following beneficial effects:

[0017] The utility model is that the drill bit limiting sleeve and the cylindrical hole opener are detachably connected to form a whole. After the hole opening processing is completed, the sliding sleeve is pulled or pushed along the axial direction of the drill bit limiting sleeve. When the limiting part cooperates with the limiting steel ball, the limiting steel ball cooperates with the positioning groove to lock, and the limiting steel ball and the positioning groove are in a locked state; as the sliding sleeve moves, when the limiting part and the limiting steel ball are separated, the force applied by the limiting part on the limiting steel ball disappears, and the limiting steel ball can leave the positioning groove and enter the avoidance part of the sliding sleeve. At this time, the limiting steel ball and the positioning groove are in an unlocked state, the hexagonal center drill is pulled out, and then the cylindrical hole opener is disassembled and taken out, so as to achieve the purpose of quickly returning waste materials or quickly replacing the cylindrical hole opener. The utility model is easy to use, has a good user experience effect, is novel in structure, has a low manufacturing cost, has good economic benefits, and can be widely promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a hole opener connecting rod according to Embodiment 1 of the utility model;

[0019] Figure 2 This is a schematic diagram of a top view of a hole opener connecting rod according to Embodiment 1 of the utility model;

[0020] Figure 3 yes Figure 2 AA section view;

[0021] Figure 4 This is a schematic diagram of the exploded structure of a hole opener connecting rod in Example 1 of the utility model;

[0022] Figure 5 It is a three-dimensional structural schematic diagram of the sliding sleeve of Embodiment 1 of the utility model;

[0023] Figure 6 It is a three-dimensional structural schematic diagram of a drill bit limiting sleeve of Embodiment 1 of the utility model;

[0024] Figure 7 This is a schematic diagram of the three-dimensional structure of the hexagonal center drill of Example 1 of the utility model;

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the cylindrical hole opener of Example 1 of the utility model;

[0026] Fig. 9 This is one of the overall structural schematic diagrams of a hole opener connecting rod in Embodiment 2 of the utility model;

[0027] Fig.10 This is the second schematic diagram of the overall structure of a hole opener connecting rod according to Embodiment 2 of the present utility model;

[0028] Fig.11 This is a schematic diagram of the top view of a hole opener connecting rod according to Embodiment 2 of the present utility model;

[0029] Fig.12 yes Fig.11 BB cross-sectional view;

[0030] Fig.13 This is a schematic diagram of the exploded structure of a hole opener connecting rod in Embodiment 2 of the utility model;

[0031] Fig.14 It is a schematic diagram of the three-dimensional structure of the drill bit limiting sleeve of Embodiment 2 of the utility model;

[0032] Fig.15 It is a three-dimensional structural schematic diagram of the sliding sleeve of Embodiment 2 of the utility model;

[0033] Fig.16 This is a schematic diagram of the three-dimensional structure of the pressing slider of Embodiment 2 of the utility model;

[0034] Fig.17 It is a schematic diagram of the three-dimensional structure of the fixing block of Example 2 of the utility model.

[0035] In the accompanying drawings: 1-handle assembly; 2-hole opening assembly; 3-reset assembly; 4-converter; 5-end cover; 6-pressing assembly; 7-positioning pin; 8-rivet; 11-drill limit sleeve; 12-limiting mechanism; 21-hexagonal center drill; 22-cylindrical hole opener; 31-reset spring; 32-reset clamp; 33-reset guide cylinder; 61-pressing slider; 62-fixing block; 63-pressing spring; 111-limiting hole; 112-slide groove; 121-limiting steel ball; 122-slide sleeve; 211-positioning groove; 221-chip removal groove; 600-mounting part; 611-first semi-cylindrical mounting part; 612-first spring mounting hole; 613-arc-shaped pressing part; 621-second semi-cylindrical mounting part; 622-second spring mounting hole; 1221-limiting part; 1222-positioning pin hole. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their 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 at least one of the features; in addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] The following is combined with Figure 1-17 The utility model is described in further detail.

[0041] Embodiment 1:

[0042] like Figures 1 to 8As shown, a hole opener connecting rod comprises a handle assembly 1 and a hole opener assembly 2, wherein the upper end of the handle assembly 1 is detachably connected to the hole opener assembly 2, and the lower end of the handle assembly 1 is connected to a driving assembly to drive the hole opener assembly 2 to rotate; wherein: the handle assembly 1 comprises a drill stop sleeve 11 and a stop mechanism 12, the hole opener assembly 2 comprises a hexagonal center drill 21 and a cylindrical hole opener 22; the stop mechanism 12 comprises a stop steel ball 121 and a sliding sleeve 122; the drill stop sleeve 11 is detachably connected to the cylindrical hole opener 22 to form a whole; a stop hole 111 is provided on the drill stop sleeve 11; the stop steel ball 12 1 is installed in the limiting hole 111, and a positioning groove 211 is provided on the hexagonal center drill 21; the positioning groove 211 is semicircular or arc-shaped; the limiting steel ball 121 is limited by the positioning groove 211; a limiting portion 1221 is provided on the inner wall of the sliding sleeve 122; the sliding sleeve 122 is movably sleeved on the drill limiting sleeve 11 along the axial direction of the drill limiting sleeve 11; the sliding sleeve 122 moves axially along the drill limiting sleeve 11, so that the limiting portion 1221 is matched or separated with the limiting steel ball 121, forming a locked state and an unlocked state so that the drill limiting sleeve 11 and the hexagonal center drill 21 are locked or unlocked. The utility model forms a whole by detachably connecting the drill bit limiting sleeve 11 and the cylindrical hole opener 22. After the hole opening process is completed, the sliding sleeve 122 is pulled or pushed along the axial direction of the drill bit limiting sleeve 11. When the limiting portion 1221 cooperates with the limiting steel ball 121, the limiting steel ball 121 cooperates with the positioning groove 211 to lock, and the limiting steel ball 121 and the positioning groove 211 are in a locked state; as the sliding sleeve 122 moves, when the limiting portion 1221 separates from the limiting steel ball 121, the limiting portion 122 When the force applied to the limiting steel ball 121 disappears, the limiting steel ball 121 can leave the positioning groove 211 and enter the avoidance portion of the sliding sleeve 122. At this time, the limiting steel ball 121 and the positioning groove 211 are in an unlocked state, the hexagonal center drill 21 is pulled out, and then the cylindrical hole opener 22 is disassembled and taken out, so as to achieve the purpose of quickly returning waste or quickly replacing the cylindrical hole opener 22. The utility model is easy to use, has a good user experience effect, is novel in structure, has a low manufacturing cost, has good economic benefits, and can be widely promoted.

[0043] Specifically, in this embodiment, the sliding sleeve 122 is movably mounted on the drill limit sleeve 11 through the reset assembly 3; the reset assembly 3 includes a reset spring 31 and a reset snap ring 32; the upper end of the reset spring 31 abuts against the lower end surface of the limiting portion 1221; the lower end of the reset spring 31 abuts against the lower end circular protrusion of the drill limit sleeve 11; the reset snap ring 32 is clamped in the upper end groove of the drill limit sleeve 11; when the reset spring 31 is naturally reset, the top of the sliding sleeve 122 abuts against the reset snap ring 32, and the hexagonal center drill 21 is in a locked state. It should be noted that when the hexagonal center drill 21 needs to be removed, the sleeve 122 is pulled downward along the axial direction of the drill limit sleeve 11. At this time, the sleeve 122 compresses the reset spring 31, and the limiting portion 1221 gradually leaves the limiting steel ball 121, so that the limiting steel ball 121 obtains a larger displacement space. When the limiting portion 1221 is completely separated from the limiting steel ball 121, the force applied by the limiting portion 1221 to the limiting steel ball 121 disappears, and the limiting steel ball 121 can leave the positioning groove 211 and enter the avoidance portion of the sleeve 122, thereby unlocking the hexagonal center drill 21 and quickly removing the hexagonal center drill 21. It should be noted that the natural reset state of the sliding sleeve 122 is the state of locking the hexagonal center drill 21. When the sliding sleeve 122 is pulled downward, the limiting steel ball 121 can have a larger displacement space to accommodate the limiting steel ball 121 so as to unlock the hexagonal center drill 21. The locking and release can be installed quickly, which is more convenient and efficient than the conventional use of fastening screws to lock and fix the center drill.

[0044] Specifically, in this embodiment, the cylindrical hole opener 22 is detachably connected to the drill stopper sleeve 11 via the converter 4. It should be noted that the cylindrical hole openers 22 of different specifications can be quickly replaced by providing the converter 4, which effectively improves the work efficiency.

[0045] Specifically, in this embodiment, the top of the sleeve 122 is symmetrically provided with positioning pin holes 1222; the positioning pin holes 1222 are provided with positioning pins 7 passing through the cylindrical hole opener 22. It should be noted that the positioning pins 7 are provided to resist the torque generated by the cylindrical hole opener 22 during chip cutting.

[0046] Specifically, in this embodiment, a chip removal groove 221 is provided on the side wall of the cylindrical hole opener 22 to facilitate the discharge of waste chips, which is beneficial to improving the hole opening accuracy and work efficiency.

[0047] Embodiment 2: Based on Embodiment 1, the drill bit limiting sleeve 11 is further improved:

[0048] Reference Figures 8 to 17Specifically, in the present embodiment, a slide groove 112 with an opening at one end is provided on the top of the drill limit sleeve 11; a pressing assembly 6 is encapsulated on the slide groove 112 through an end cover 5; the pressing assembly 6 includes a pressing slider 61, a fixing block 62 and a pressing spring 63; the fixing block 62 is fixedly installed on the drill slide groove 112; the pressing slider 61 can be slidably installed on the slide groove 112; one end of the pressing slider 61 is respectively provided with a first semi-cylindrical mounting portion 611 and a first spring mounting hole 612; one end of the fixing block 62 is provided with a second semi-cylindrical mounting portion 621 and a second spring mounting hole 622; the first semi-cylindrical mounting portion 611 is combined with the second semi-cylindrical mounting portion 621 by movement to form a mounting portion 600 assembled with the cylindrical hole opener 22 and avoiding the hexagonal center drill 21; one end of the pressing spring 63 is connected to the first spring mounting hole 612, and the other end is connected to the second spring mounting hole 622. It should be noted that when the cylindrical hole opener 22 needs to be removed, the pressing slider 61 is pressed to overcome the elastic force of the pressing spring 63 and move toward the fixed block 62. At this time, as the pressing slider 61 slides, the first semi-cylindrical mounting portion 611 gradually approaches the second semi-cylindrical mounting portion 621, thereby reducing the overall diameter of the mounting portion 600. The cylindrical hole opener 22 clamped on the mounting portion 600 has a larger displacement space to accommodate the bottom hole of the cylindrical hole opener 22 for unlocking as the diameter of the mounting portion 600 is reduced, so that the cylindrical hole opener 22 is disengaged from the drill bit limit sleeve 11, and the cylindrical hole openers 22 of different specifications can be quickly installed, locked and released, which is more convenient and efficient than the conventional structure of screwing and connecting, and achieves the purpose of quickly returning waste or quickly replacing the cylindrical hole opener 22. It should be noted that the state of the natural reset of the pressing slider 61 is the state of locking the cylindrical hole opener 22.

[0049] Specifically, in the present embodiment, the sleeve 122 is movably sleeved on the drill limit sleeve 11 through the reset assembly 3; the reset assembly 3 includes a reset spring 31, a reset clamping ring 32 and a reset guide cylinder 33; the reset guide cylinder 33 is sleeved on the upper end of the drill limit sleeve 11; the lower end of the reset guide cylinder 33 is connected with the upper end of the sleeve 122; the upper end of the reset spring 31 abuts against the top inner end surface of the reset guide cylinder 33; the lower end of the reset spring 31 abuts against the upper end surface of the limiting portion 1221; the reset clamping ring 32 is clamped in the lower end groove of the drill limit sleeve 11; when the reset spring 31 is naturally reset, the bottom of the sleeve 122 abuts against the reset clamping ring 32, and the hexagonal center drill 21 is in a locked state. It should be noted that when the hexagonal center drill 21 needs to be removed, the sleeve 122 is pushed upward along the axial direction of the drill limit sleeve 11. At this time, the sleeve 122 compresses the reset spring 31 and moves upward along the reset guide cylinder 33. The limiting portion 1221 gradually leaves the limiting steel ball 121, so that the limiting steel ball 121 obtains a larger displacement space. When the limiting portion 1221 is completely separated from the limiting steel ball 121, the force applied by the limiting portion 1221 to the limiting steel ball 121 disappears, and the limiting steel ball 121 can leave the positioning groove 211 and enter the avoidance portion of the sleeve 122, thereby unlocking the hexagonal center drill 21 and quickly removing the hexagonal center drill 21. It should be noted that the natural reset state of the sliding sleeve 122 is the state of locking the hexagonal center drill 21. When the sliding sleeve 122 is pushed forward, the limiting steel ball 121 can have a larger displacement space to accommodate the limiting steel ball 121 so as to unlock the hexagonal center drill 21. The locking and release can be installed quickly, which is more convenient and efficient than the conventional use of fastening screws to lock and fix the center drill.

[0050] Specifically, in this embodiment, the top of the drill stop sleeve 11 is symmetrically provided with positioning pin holes 1222; the positioning pin holes 1222 are provided with positioning pins 7 passing through the cylindrical hole opener 22. It should be noted that the positioning pins 7 are provided to resist the torque generated by the cylindrical hole opener 22 during chip cutting.

[0051] Specifically, in this embodiment, the other end of the pressing slider 61 is provided with an arc-shaped pressing portion 613 to facilitate the pressing operation by the staff, thereby effectively improving the disassembly efficiency of the cylindrical hole opener 22 .

[0052] Specifically, in the present embodiment, the pressing slider 61 , the fixing block 62 and the end cover 5 are all provided with through holes for the positioning pin 7 to pass through, so as to facilitate the installation of the positioning pin 7 .

[0053] Specifically, in this embodiment, the end cover 5 is packaged on the top of the drill bit limiting sleeve 11 through the rivet 8.

[0054] In summary, the utility model has the following beneficial effects:

[0055] The hole opener connecting rod of the utility model is an improvement on the quick replacement of the hole opener, which makes customers more labor-saving and convenient, and greatly improves work efficiency. The utility model is detachably connected with the cylindrical hole opener 22 through the drill bit limiting sleeve 11 to form a whole. After the hole opening process is completed, the sliding sleeve 122 is pulled or pushed along the axial direction of the drill bit limiting sleeve 11. When the limiting portion 1221 cooperates with the limiting steel ball 121, the limiting steel ball 121 cooperates with the positioning groove 211 to lock, and the limiting steel ball 121 and the positioning groove 211 are locked. 1 is in a locked state; as the sliding sleeve 122 moves, when the limiting portion 1221 separates from the limiting steel ball 121, the force exerted by the limiting portion 1221 on the limiting steel ball 121 disappears, and the limiting steel ball 121 can leave the positioning groove 211 and enter the avoidance portion of the sliding sleeve 122. At this time, the limiting steel ball 121 and the positioning groove 211 are in an unlocked state, the hexagonal center drill 21 is pulled out, and then the cylindrical hole opener 22 is disassembled and taken out, so as to achieve the purpose of quickly returning waste or quickly replacing the cylindrical hole opener 22.

[0056] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A hole opener connecting rod, comprising a handle assembly and a hole opening assembly, wherein the upper end of the handle assembly is detachably connected to the hole opening assembly, and the lower end of the handle assembly is connected to a driving assembly to drive the hole opening assembly to rotate; characterized in that: The turning handle assembly includes a drill limit sleeve and a limit mechanism, and the hole opening assembly includes a hexagonal center drill and a cylindrical hole opener; the limit mechanism includes a limit steel ball and a sliding sleeve; the drill limit sleeve and the cylindrical hole opener are detachably connected to form a whole; a limit hole is provided on the drill limit sleeve; the limit steel ball is installed in the limit hole, and the hexagonal center drill is provided with a positioning groove; the limit steel ball cooperates with the positioning groove for limiting; a limit portion is provided on the inner side wall of the sliding sleeve; the sliding sleeve is movably sleeved on the drill limit sleeve along the axial direction of the drill limit sleeve; the sliding sleeve moves axially along the drill limit sleeve, so that the limit portion cooperates or separates with the limit steel ball, forming a locked state and an unlocked state to lock or unlock the drill limit sleeve and the hexagonal center drill.

2. A hole opener connecting rod according to claim 1, characterized in that: A slide groove with an open end is provided on the top of the drill limit sleeve; a pressing assembly is encapsulated on the slide groove through an end cover; the pressing assembly includes a pressing slider, a fixing block and a pressing spring; the fixing block is fixedly installed on the slide groove; the pressing slider can be slidably installed on the slide groove; one end of the pressing slider is respectively provided with a first semi-cylindrical mounting portion and a first spring mounting hole; one end of the fixed block is provided with a second semi-cylindrical mounting portion and a second spring mounting hole; the first semi-cylindrical mounting portion is combined with the second semi-cylindrical mounting portion by movement to form a mounting portion that is assembled with the cylindrical hole opener and avoids the hexagonal center drill; one end of the pressing spring is connected to the first spring mounting hole, and the other end is connected to the second spring mounting hole.

3. The hole opener connecting rod according to claim 1, characterized in that: The sliding sleeve is movably mounted on the drill limit sleeve through a reset assembly; the reset assembly includes a reset spring and a reset clamp ring; the upper end of the reset spring abuts against the lower end surface of the limit portion; the lower end of the reset spring abuts against the circular protrusion at the lower end of the drill limit sleeve; the reset clamp ring is clamped in the upper end groove of the drill limit sleeve; when the reset spring is naturally reset, the top of the sliding sleeve abuts against the reset clamp ring, and the hexagonal center drill is in a locked state.

4. A hole opener connecting rod according to claim 3, characterized in that: The reset assembly includes a reset spring, a reset clamp and a reset guide cylinder; the reset guide cylinder is sleeved on the upper end of the drill limit sleeve; the lower end of the reset guide cylinder is connected to the upper end of the sliding sleeve; the upper end of the reset spring abuts against the top inner end surface of the reset guide cylinder; the lower end of the reset spring abuts against the upper end surface of the limiting portion; the reset clamp is clamped in the lower end groove of the drill limit sleeve; when the reset spring is naturally reset, the bottom of the sliding sleeve abuts against the reset clamp, and the hexagonal center drill is in a locked state.

5. The hole opener connecting rod according to claim 2, characterized in that: Positioning pin holes are symmetrically arranged on the top of the sliding sleeve; positioning pins passing through the cylindrical hole opener are inserted into the positioning pin holes.

6. The hole opener connecting rod according to claim 2, characterized in that: The other end of the pressing slider is provided with an arc-shaped pressing portion.

7. The hole opener connecting rod according to claim 1, characterized in that: The cylindrical hole opener is detachably connected to the drill bit limiting sleeve via a converter.

8. The hole opener connecting rod according to claim 5, characterized in that: The pressing slider, the fixing block and the end cover are all provided with through holes for the positioning pin to pass through.

9. The hole opener connecting rod according to claim 2, characterized in that: The end cover is packaged on the top of the drill bit limiting sleeve through rivets.

10. The hole opener connecting rod according to claim 1, characterized in that: A chip removal groove is provided on the side wall of the cylindrical hole opener.

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