Novel hole saw extension rod

Abstract

Disclosed in the present invention is a novel hole saw extension rod, comprising a rotating shank assembly and a trepanning assembly, wherein the rotating shank assembly comprises a drill bit limiting sleeve and a limiting mechanism; the trepanning assembly comprises a rapid adapter and a cylindrical hole saw; the limiting mechanism comprises a limiting steel ball, an upper cover and a sliding sleeve; a first accommodating cavity fitted with the lower end of the rapid adapter is formed in the upper end of the drill bit limiting sleeve; an ejection mechanism is arranged in the first accommodating cavity; the upper end of the rapid adapter and the cylindrical hole saw are threadedly connected into a whole; a first limiting hole penetrating through the side wall of the first accommodating cavity is formed in the drill bit limiting sleeve, the limiting steel ball is fitted and installed in the first limiting hole, a first positioning groove is formed in the lower end of the rapid adapter, and the limiting steel ball matches with the first positioning groove for limiting. The rapid adapter and the cylindrical hole saw of the present invention can be easily pulled out downwards together, thereby achieving the purpose of rapid waste removal or rapid replacement of the cylindrical hole saw.

Description

A new type of hole opener connecting rod Technical Field

[0001] The invention relates to the technical field of hole openers, in particular to a novel 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 a thread. 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 inside the hole opener body.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to provide a new type of hole opener connecting rod, the quick conversion head and the cylindrical hole opener can be easily pulled out downward together, so as to achieve the purpose of quickly returning waste materials or quickly replacing the cylindrical hole opener.

[0006] The present invention is achieved through the following technical solutions:

[0007] The cam is connected to the drive assembly to rotate the drill bit assembly.

[0008] As a further improvement to the technical solution of the present invention, a first limiting portion and a second limiting portion are provided on the upper cover, the inner diameter of the first limiting portion is smaller than the inner diameter of the second limiting portion, and 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, so that the first limiting portion and the second limiting portion respectively cooperate with the limiting steel ball to form a locked state and an unlocked state so that the drill limiting sleeve is locked or unlocked with the quick conversion head.

[0009] As a further improvement of the technical solution of the present invention, the limiting mechanism includes a positioning member for limiting the downward displacement of the sliding sleeve; the positioning member is arranged on the outer wall of the lower end of the drill limit sleeve, and the lower end of the upper cover is provided with a first cavity, and the outer wall of the drill limit sleeve cooperates with the inner wall of the first cavity for guidance.

[0010] As a further improvement of the technical solution of the present invention, the upper cover is provided with a third accommodating cavity located on the first cavity, the inner diameter of the third accommodating cavity is smaller than the inner diameter of the first cavity, and an elastic component is contained in the third accommodating cavity. The elastic component is axially movably sleeved on the outer circle of the main body, and the lower end of the elastic component passes through the first cavity and abuts against the upper surface of the positioning member.

[0011] As a further improvement of the technical solution of the present invention, the ejection mechanism includes an ejection block, an ejection spring and a spring fixing ring; the ejection spring is installed in the first accommodating cavity through the spring fixing ring; one end of the ejection block abuts against the ejection spring, and the other end abuts against the quick conversion head.

[0012] As a further improvement to the technical solution of the present invention, a drill positioning hole is provided at the lower end of the drill limiting sleeve; after the positioning drill bit is assembled on the drill limiting sleeve, it is limited by a drill limiting screw.

[0013] As a further improvement to the technical solution of the present invention, a drill bit positioning hole is provided in the middle of the quick-change head; after the positioning drill bit is assembled on the quick-change head, it is limited by a drill bit limiting screw.

[0014] As a further improvement to the technical solution of the present invention, a chip removal groove is provided on the side wall of the cylindrical hole opener.

[0015] As a further improvement of the technical solution of the present invention, two first limiting holes are provided, two limiting steel balls are provided, the limiting steel balls are installed in the first limiting holes, and the limiting steel balls cooperate with the first positioning grooves to limit.

[0016] As a further improvement to the technical solution of the present invention, the sliding sleeve is a plastic sliding sleeve or a metal sliding sleeve.

[0017] As a further improvement of the technical solution of the present invention, a new hole opener connecting rod includes a handle assembly and a hole opening assembly, the upper end of the handle assembly is connected to the hole opening assembly, the lower end of the handle assembly is connected to the driving assembly to drive the hole opening assembly to rotate, the handle assembly and the hole opening assembly are detachably connected, the handle assembly includes a drill limit sleeve and a limiting mechanism, and the hole opening assembly includes a quick-change head; the limiting mechanism includes a limiting steel ball, a sliding sleeve and an upper cover; the upper end of the drill limit sleeve is provided with a first accommodating cavity for cooperating with the lower end of the quick-change head; an ejection mechanism is provided in the first accommodating cavity; the inner circular side wall of the sliding sleeve is divided into an upper inner circular side wall and a lower inner circular side wall; the diameter of the upper inner circular side wall is smaller than the diameter of the lower inner circular side wall; the upper inner circular side wall is provided with a mounting mechanism for installing the The tool is fixed with a steel ball fixing hole for the limiting steel ball; the lower end of the quick-changing head is provided with a first positioning groove, and the limiting steel ball cooperates with the first positioning groove for limiting position; the upper cover is fixedly connected to the drill limit sleeve; when the sliding sleeve is pulled back along the axial direction of the drill limit sleeve, the upper inner circle side wall leaves the limiting steel ball so that the limiting steel ball has an air-avoiding space to reach an unlocked state, and at the same time, the quick-changing head is ejected by the ejection mechanism; when the sliding sleeve is reset to the normal position by the reset assembly, when the limiting steel ball is in the cooperating position of the upper inner circle side wall, the limiting steel ball cooperates with the upper inner circle side wall to lock and reach a locked state; the cooperation between the limiting steel ball and the sliding sleeve forms a locked state and an unlocked state so that the drill limit sleeve and the quick-changing head are locked or unlocked.

[0018] As a further improvement of the technical solution of the present invention, the reset assembly includes a positioning pin and a reset spring; the positioning pin passes through the drill limit sleeve and the upper cover in sequence; the lower end of the positioning pin is knurled and riveted to the sliding sleeve; the reset spring is sleeved on the positioning pin; a limiting end is provided at the upper end of the positioning pin; the upper end of the reset spring abuts against the limiting end; the lower end of the reset spring abuts against the inner hole of the upper cover; when the sliding sleeve is pulled backward along the axial direction of the drill limit sleeve, the reset spring is in a compressed state.

[0019] As a further improvement to the technical solution of the present invention, the upper cover is fixedly connected to the drill limit sleeve by screws.

[0020] As a further improvement to the technical solution of the present invention, two positioning planes are symmetrically provided at the opening of the first accommodating cavity.

[0021] In summary, the present invention has the following beneficial effects:

[0022] The present invention forms a whole by connecting the quick-changing head with the cylindrical hole opener, and the quick-changing head, the drill bit limiting sleeve and the upper cover are matched and connected. After the hole opening processing is completed, the sliding sleeve is pulled backward along the axial direction of the drill bit limiting sleeve, and when the first limiting part cooperates with the limiting steel ball, the limiting steel ball cooperates and locks with the first positioning groove. When the second limiting part, the first limiting hole and the first positioning groove are located on the same straight line, the limiting steel ball cooperates with the second limiting part, and the limiting steel ball and the first positioning groove are in an unlocked state, and the cylindrical hole opener is pulled downward, and the limiting steel ball partially passes through the first limiting hole and slides to the second limiting part and disengages from the first positioning groove; or when the sliding sleeve is pulled backward along the axial direction of the drill bit limiting sleeve, the upper inner circular side wall leaves the limiting steel ball to make The limiting steel ball has an air-avoiding space to reach an unlocked state, and the quick-conversion head is ejected by the ejection mechanism; when the sliding sleeve is reset to the normal position by the reset assembly, the limiting steel ball is in the matching position of the upper inner circle side wall, and the limiting steel ball and the upper inner circle side wall are locked to reach a locked state; the matching of the limiting steel ball and the sliding sleeve forms a locked state and an unlocked state so that the drill bit limiting sleeve and the quick-conversion head are locked or unlocked; the quick-conversion head and the cylindrical hole opener can be easily pulled downward together to achieve the purpose of quickly returning waste materials or quickly replacing the cylindrical hole opener. The present invention is easy to use, has a good user experience effect, is novel in structure, has a low production cost, has good economic benefits, and can be widely promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of the overall structure of a new hole opener connecting rod according to Example 1 of the present invention;

[0024] FIG2 is a schematic diagram of the exploded structure of a novel hole opener connecting rod according to Example 1 of the present invention;

[0025] FIG3 is a schematic diagram of the three-dimensional structure of the quick-change head according to Example 1 of the present invention;

[0026] FIG4 is a schematic diagram of the three-dimensional structure of the upper cover of Example 1 of the present invention;

[0027] FIG5 is a schematic diagram of the three-dimensional structure of the drill bit limiting sleeve according to embodiment 1 of the present invention;

[0028] FIG6 is a schematic diagram of the three-dimensional structure of a cylindrical hole opener according to Example 1 of the present invention;

[0029] FIG7 is a schematic diagram of the exploded structure of a new hole opener connecting rod according to Example 2 of the present invention;

[0030] FIG8 is a schematic diagram of the three-dimensional structure of a quick-change head according to embodiment 2 of the present invention;

[0031] FIG9 is a schematic diagram of the three-dimensional structure of a drill bit limiting sleeve according to embodiment 2 of the present invention;

[0032] 10 is a schematic diagram of the overall structure of a new hole opener connecting rod according to Example 3 of the present invention;

[0033] FIG11 is a schematic diagram of the exploded structure of a novel hole opener connecting rod according to Example 3 of the present invention;

[0034] 12 is a schematic diagram of the three-dimensional structure of the sliding sleeve, upper cover, quick-change head and drill bit limiter assembly according to embodiment 3 of the present invention;

[0035] FIG13 is a cross-sectional view of the internal structure of FIG12;

[0036] FIG14 is a schematic diagram of the three-dimensional structure of the sliding sleeve according to embodiment 3 of the present invention;

[0037] 15 is a schematic diagram of the three-dimensional structure of the drill bit limit sleeve of Example 3 of the present invention;

[0038] 16 is a schematic diagram of the three-dimensional structure of the quick conversion head according to Example 2 of the present invention;

[0039] FIG17 is a schematic diagram of the three-dimensional structure of the upper cover of Example 3 of the present invention.

[0040] In the accompanying drawings: 400 - elastic component; 1 - handle assembly; 2 - hole opening assembly; 3 - ejection mechanism; 4 - reset assembly; 5 - positioning drill bit; 7 - screw; 11 - drill bit limiting sleeve; 12 - limiting mechanism; 21 - quick-change head; 22 - cylindrical hole opener; 31 - ejection block; 32 - ejection spring; 33 - spring fixing ring; 41 - positioning pin; 42 - reset spring; 111 - first accommodating chamber; 112 -First limiting hole; 113-drill bit positioning hole; 114-drill bit limiting screw; 121-limiting steel ball; 122-sleeve; 123-upper cover; 124-positioning piece; 211-first positioning groove; 221-chip groove; 1111-positioning plane; 1223-upper inner circular side wall; 1224-lower inner circular side wall; 1232-positioning hole; 1233-first limiting part; 1234-second limiting part. DETAILED DESCRIPTION

[0041] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0042] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In the present invention, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, "connection" can mean fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two elements, or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one such feature. Furthermore, the technical solutions of various embodiments may be combined with each other, but only on the basis that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions contradicts or cannot be implemented, it shall be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this disclosure.

[0045] The present invention will be further described in detail below with reference to the accompanying drawings.

[0046] Example 1: As shown in Figures 1 to 6, a new type of hole opener connecting rod includes a handle assembly 1 and a hole opening assembly 2. The upper end of the handle assembly 1 is detachably connected to the hole opening assembly 2, and the lower end of the handle assembly 1 is connected to the driving assembly to drive the hole opening assembly 2 to rotate; the handle assembly 1 includes a drill bit limiting sleeve 11 and a limiting mechanism 12, the hole opening assembly 2 includes a quick conversion head 21 and a cylindrical hole opener 22, the limiting mechanism 12 includes a limiting steel ball 121, an upper cover 123 and a sliding sleeve 122; the upper end of the drill bit limiting sleeve 11 is provided with a The lower end of the quick-change head 21 is fitted with a first accommodating chamber 111; an ejection mechanism 3 is provided in the first accommodating chamber 111; the upper end of the quick-change head 21 is threadedly connected to the cylindrical hole opener 22 to form a whole; the drill bit limiting sleeve 11 is provided with a first limiting hole 112 that passes through the side wall of the first accommodating chamber 111, and the limiting steel ball 121 is fitted in the first limiting hole 112; the lower end of the quick-change head 21 is provided with a first positioning groove 211, and the limiting steel ball 121 cooperates with the first positioning groove 211 for limiting. It should be noted that the drill limit sleeve 11 (main body) is installed in conjunction with the quick-change head 21, and the quick-change head 21 is connected to the cylindrical hole opener 22 to form a whole; the drill limit sleeve 11 is provided with a first limit hole 112 for cooperating with the installation of the limit steel ball 121, and the quick-change head 21 is provided with a first positioning groove 211 cooperating with the limit steel ball 121, and the upper cover 123 is provided with a first limit part 1233 and a second limit part 1234, the sliding sleeve 122 and the upper cover 123 are interference fit or undercut fit, the sliding sleeve 122 is provided on the drill limit sleeve 11, and the sliding sleeve 122 moves axially along the drill limit sleeve 11, so that the first limit part 1233 and the second limit part 1234 respectively cooperate with the limit steel ball 121 to form a locked state and an unlocked state. The quick-change head 21 and the cylindrical hole opener 22 are connected to form a whole. After the hole opening is completed, the quick-change head 21 and the cylindrical hole opener 22 are pulled out together to achieve the purpose of quickly returning waste materials or quickly replacing the hole opener.

[0047] Specifically, in this embodiment, the inner diameter of the first limiting portion 1233 is smaller than the inner diameter of the second limiting portion 1234, and 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 first limiting portion 1233 and the second limiting portion 1234 respectively cooperate with the limiting steel ball 121 to form a locked state and an unlocked state so that the drill limiting sleeve 11 and the quick conversion head 21 are locked or unlocked. It should be noted that the present invention forms a whole by connecting the quick-change head 21 with the cylindrical hole opener 22. The quick-change head 21, the drill bit limiting sleeve 11 and the upper cover 123 are connected in a coordinated manner. After the hole opening process is completed, the sliding sleeve 122 is pulled backward along the axial direction of the drill bit limiting sleeve 11. When the first limiting portion 1233 cooperates with the limiting steel ball 121, the limiting steel ball 121 cooperates with the first positioning groove 211 to lock. When the second limiting portion 1234, the first limiting hole 112 and the first limiting hole 113 are locked, the first limiting hole 113 is locked. When the positioning grooves 211 are located on the same straight line, the limiting steel ball 121 cooperates with the second limiting portion 1234, and the limiting steel ball 121 and the first positioning groove 211 are in an unlocked state. The cylindrical hole opener 22 is pulled downward, and the limiting steel ball 121 partially passes through the first limiting hole 112 and slides to the second limiting portion 1234 and disengages from the first positioning groove 211. The quick conversion head 21 and the cylindrical hole opener 22 can be easily pulled downward together, thereby achieving the purpose of quickly returning waste materials or quickly replacing the cylindrical hole opener 22.

[0048] Specifically, in this embodiment, the limiting mechanism 12 includes a positioning member 124 for limiting the downward displacement of the sliding sleeve 122; the positioning member 124 is arranged on the outer wall of the lower end of the drill limit sleeve 11, and the lower end of the upper cover 123 is provided with a first cavity, and the outer wall of the drill limit sleeve 11 cooperates with the inner wall of the first cavity for guidance.

[0049] Specifically, in this embodiment, the upper cover 123 is provided with a third accommodating cavity located on the first cavity, the inner diameter of the third accommodating cavity is smaller than the inner diameter of the first cavity, and the third accommodating cavity contains an elastic component 400, which is movably axially sleeved on the outer circle of the main body, and the lower end of the elastic component 400 passes through the first cavity and abuts against the upper surface of the positioning member 124. It should be noted that the upper surface of the positioning member 124 is used to support the elastic component 400, and the sleeve 122 is reset after being unlocked by the tension of the elastic component 400. The boss surface at the top of the drill limit sleeve 11 limits the downward displacement of the sleeve 122, and at the same time guides the inner wall of the sleeve 122. A third limiting portion is provided to cooperate with the first limiting portion 1233 and the second limiting portion 1234 to limit the upward movement stroke of the sleeve 122, so that the axial movement of the sleeve 122 along the drill limit sleeve 11 is smoother, easier to operate, and the structural connection is more compact.

[0050] Specifically, in this embodiment, the ejection mechanism 3 includes an ejection block 31, an ejection spring 32, and a spring retaining ring 33. The ejection spring 32 is mounted within the first accommodating chamber 111 via the spring retaining ring 33. One end of the ejection block 31 abuts against the ejection spring 32, and the other end abuts against the quick-change head 21. It should be noted that when the sliding sleeve 122 is pulled rearward along the axial direction of the drill stop sleeve 11, the ejection block 31 enters the unlocked state, at which point the ejection block 31 pushes the quick-change head 21 axially out, facilitating removal of the drilling assembly 2.

[0051] Specifically, in this embodiment, the lower end of the drill stop sleeve 11 is provided with a drill positioning hole 113. After the positioning drill bit 5 is assembled in the drill stop sleeve 11, it is restrained in position by a drill stop screw 114. It should be noted that the drill stop screw 114 restrains the positioning drill bit 5, preventing it from shifting during the drilling operation, which could affect drilling accuracy and efficiency. The positioning drill bit 5 serves as a positioning and guide for the cylindrical hole saw 22 during drilling, thereby improving drilling accuracy.

[0052] 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.

[0053] Specifically, in this embodiment, the sliding sleeve 122 is a plastic sliding sleeve or a metal sliding sleeve.

[0054] Specifically, in this embodiment, the inner square hole of the drill bit limiting sleeve 11 cooperates with the outer square shank of the quick-change head 21 to resist the torque generated by the chip cutting operation.

[0055] Specifically, in this embodiment, the countersunk hole on the end surface of the drill bit limiting sleeve 11 serves to guide and position the quick-change head 21 components to ensure working concentricity.

[0056] Example 2: Referring to Figures 7 to 9 , the quick-change head 21 is improved upon Example 1 by placing a drill positioning hole 113 in the center of the quick-change head 21. It should be noted that a drill stop screw 114 limits the positioning drill bit 5, preventing it from shifting during drilling, which could affect drilling accuracy and efficiency. The positioning drill bit 5 serves as a positioning and guide for the cylindrical hole saw 22 during drilling, thereby improving drilling accuracy.

[0057] On the basis of Example 1, the drill limit sleeve 11 is improved, and the drill positioning hole 113 set on the drill limit sleeve 11 is cancelled; two first limiting holes 112 that pass through the side wall of the first accommodating cavity are symmetrically provided on the drill limit sleeve 11, and two limiting steel balls 121 are respectively installed in the two first limiting holes 112. At the same time, the two limiting steel balls 121 respectively cooperate with the first positioning groove 211 for limiting.

[0058] Example 3: Referring to Figures 10 to 17, a new hole opener connecting rod includes a handle assembly 1 and a hole opening assembly 2. The upper end of the handle assembly 1 is connected to the hole opening assembly 2, and the lower end of the handle assembly 1 is connected to the driving assembly to drive the hole opening assembly 2 to rotate. The handle assembly 1 and the hole opening assembly 2 are detachably connected. The handle assembly 1 includes a drill bit limiting sleeve 11 and a limiting mechanism 12. The hole opening assembly 2 includes a quick conversion head 21; the limiting mechanism 12 includes a limiting The upper end of the drill bit limiting sleeve 11 is provided with a first accommodating cavity for fitting with the lower end of the quick conversion head 21; the first accommodating cavity is provided with an ejection mechanism 3; the inner circular side wall of the sliding sleeve 122 is divided into an upper inner circular side wall 1223 and a lower inner circular side wall 1224; the diameter of the upper inner circular side wall 1223 is smaller than the diameter of the lower inner circular side wall 1224; the upper inner circular side wall 1223 is provided with a cavity for fitting the limiting steel ball 12 1 steel ball fixing hole; the lower end of the quick conversion head 21 is provided with a first positioning groove 211, and the limiting steel ball 121 cooperates with the first positioning groove 211 to limit the position; the upper cover 123 is fixedly connected to the drill bit limiting sleeve 11; when the sliding sleeve 122 is pulled back along the axial direction of the drill bit limiting sleeve 11, the upper inner circular side wall 1223 leaves the limiting steel ball 121 so that the limiting steel ball 121 has an air-avoiding space to reach the unlocked state, and at the same time, the quick The quick-change head 21 is ejected by the ejection mechanism 3; when the sliding sleeve 122 is reset to the normal position by the reset assembly, the limiting steel ball 121 is in the cooperation position of the upper inner circular side wall 1223, and the limiting steel ball 121 cooperates with the upper inner circular side wall 1223 to lock and reach a locked state; the cooperation between the limiting steel ball 121 and the sliding sleeve 122 forms a locked state and an unlocked state so that the drill limit sleeve 11 and the quick-change head 21 are locked or unlocked.

[0059] It should be noted that when the present invention is used, the quick-change head 21 is connected to the cylindrical hole opener 22 to form a whole, and the quick-change head 21 is matched with the drill limit sleeve 11. After the hole opening process is completed, when the sliding sleeve 122 is pulled back, the limit steel ball 121 can be moved to an unlocked state, so that the quick-change head 21 is ejected by the ejection mechanism 3 so that it can be better taken out and replaced. When the sliding sleeve 122 is pulled back along the axial direction of the drill limit sleeve 11, the upper inner circular side wall 1223 leaves the limiting steel ball 121 so that the limiting steel ball 121 has an air-avoiding space to reach the unlocked state, and at the same time, the quick-changing head 21 is ejected by the ejection mechanism 3; when the sliding sleeve 122 is reset to the normal position by the resetting assembly 4, and the limiting steel ball 121 is in the matching position of the upper inner circular side wall 1223, the limiting steel ball 121 cooperates with the upper inner circular side wall 1223 to lock and reach the locked state; the cooperation between the limiting steel ball 121 and the sliding sleeve 122 forms a locked state and an unlocked state so that the drill limit sleeve 11 and the quick-changing head 21 are locked or unlocked; the quick-changing head 21 and the cylindrical hole opener 22 can be easily pulled downward together, so as to achieve the purpose of quickly withdrawing waste material or quickly replacing the cylindrical hole opener 22.

[0060] Specifically, in this embodiment, the reset assembly 4 includes a positioning pin 41 and a reset spring 42; the positioning pin 41 passes through the drill limit sleeve 11 and the upper cover 123 in sequence; the lower end of the positioning pin 41 is knurled and riveted to the sliding sleeve 122; the reset spring 42 is sleeved on the positioning pin 41; the upper end of the positioning pin 41 is provided with a limiting end 411; the upper end of the reset spring 42 abuts on the limiting end 411; the lower end of the reset spring 42 abuts in the inner hole of the upper cover 123; when the sliding sleeve 122 is pulled backward along the axial direction of the drill limit sleeve 11, the reset spring 42 is in a compressed state. It should be noted that the tension of the reset spring 42 can stretch and reset the sleeve 122, so that the sleeve 122 can be naturally reset after being unlocked. A positioning hole 1232 is provided on the upper cover 123; the positioning hole 1232 of the upper cover cooperates with the limit to limit the axial position and radial movement deflection of the sleeve 122, and at the same time has a guiding effect, so that the sleeve 122 can move along the axial direction of the main body more smoothly, and is easy to operate, and the structural connection is also more compact.

[0061] Specifically, in this embodiment, the ejection mechanism 3 includes an ejection block 31, an ejection spring 32, and a spring retaining ring 33. The ejection spring 32 is installed in the first accommodating chamber 111 via the spring retaining ring 33. One end of the ejection block 31 abuts the ejection spring 32, and the other end abuts the quick-change head 21. It should be noted that when the sliding sleeve 122 is pulled backward, it drives the limiting steel ball 121 to move to an unlocked state, causing the quick-change head 21 to naturally exit the first accommodating chamber 111 of the drill bit limiting sleeve 11 to form an unlocked state. At this time, the ejection block 31 will push the quick-change head 21 out in the axial direction, making it easier to remove the hole-opening mechanism assembly.

[0062] Specifically, in this embodiment, the upper cover 123 is fixedly connected to the drill bit limiting sleeve 11 by screws 7 .

[0063] Specifically, in this embodiment, two positioning planes 1111 are symmetrically provided at the opening of the first accommodating cavity 111 to facilitate the positioning and installation of the quick conversion head 21 .

[0064] In summary, the present invention has the following beneficial effects:

[0065] The hole opener connecting rod of the present invention 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 present invention forms a whole by connecting the quick conversion head 21 with the cylindrical hole opener 22. The quick conversion head 21, the drill bit limiting sleeve 11 and the upper cover 123 are connected in a coordinated manner. After the hole opening processing is completed, the sliding sleeve 122 is pulled backward along the axial direction of the drill bit limiting sleeve 11. When the first limiting portion 1233 cooperates with the limiting steel ball 121, the limiting steel ball 121 cooperates with the first positioning groove 211 to lock. When the second limiting portion 1233 cooperates with the limiting steel ball 121, the limiting steel ball 121 cooperates with the first positioning groove 211 to lock. When the part 1234, the first limiting hole 112 and the first positioning groove 211 are located on the same straight line, the limiting steel ball 121 cooperates with the second limiting part 1234, and the limiting steel ball 121 and the first positioning groove 211 are in an unlocked state. Pull the cylindrical hole opener 22 downward, and the limiting steel ball 121 partially passes through the first limiting hole 112 and slides to the second limiting part 1234 and disengages from the first positioning groove 211. The quick conversion head 21 and the cylindrical hole opener 22 can be easily pulled downward together, thereby achieving the purpose of quickly returning waste or quickly replacing the cylindrical hole opener 22. Or when the sliding sleeve 122 is pulled back along the axial direction of the drill limit sleeve 11, the upper inner circular side wall 1223 leaves the limiting steel ball 121 so that the limiting steel ball 121 has an air-avoiding space to reach the unlocked state, and at the same time, the quick-changing head 21 is ejected by the ejection mechanism 3; when the sliding sleeve 122 is reset to the normal position by the reset assembly, and the limiting steel ball 121 is in the matching position of the upper inner circular side wall 1223, the limiting steel ball 121 cooperates with the upper inner circular side wall 1223 to lock and reach the locked state; the cooperation between the limiting steel ball 121 and the sliding sleeve 122 forms a locked state and an unlocked state so that the drill limit sleeve 11 and the quick-changing head 21 are locked or unlocked; the quick-changing head 21 and the cylindrical hole opener 22 can be easily pulled downward together, so as to achieve the purpose of quickly withdrawing waste material or quickly replacing the cylindrical hole opener 22. The present invention is easy to use, has a good user experience effect, is novel in structure, has a low production cost, has good economic benefits, and can be widely promoted.

[0066] The technical solutions provided by the embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only intended 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 may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A new type of hole opener connecting rod, characterized in that: It comprises a handle assembly and a hole opening assembly, 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; the handle assembly comprises a drill limit sleeve and a limit mechanism, the hole opening assembly comprises a quick-change head and a cylindrical hole opener, and the limit mechanism comprises a limit steel ball, an upper cover and a sliding sleeve; the upper end of the drill limit sleeve is provided with a first accommodating chamber which is mounted in cooperation with the lower end of the quick-change head; an ejection mechanism is arranged in the first accommodating chamber; the upper end thread of the quick-change head is connected to the cylindrical hole opener to form a whole; the drill limit sleeve is provided with a through-hole The first limiting hole on the side wall of the first accommodating cavity, the limiting steel ball is installed in the first limiting hole, the lower end of the quick-conversion head is provided with a first positioning groove, and the limiting steel ball cooperates with the first positioning groove for limiting; the upper cover is provided with a first limiting part and a second limiting part, the inner diameter of the first limiting part is smaller than the inner diameter of the second limiting part, and 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, so that the first limiting part and the second limiting part cooperate with the limiting steel ball respectively, forming a locked state and an unlocked state so that the drill limiting sleeve and the quick-conversion head are locked or unlocked.

2. A novel hole opener connecting rod according to claim 1, characterized in that: The limiting mechanism includes a positioning member for limiting the downward displacement of the sliding sleeve; the positioning member is arranged on the outer wall of the lower end of the drill bit limiting sleeve, and a first cavity is provided at the lower end of the upper cover, and the outer wall of the drill bit limiting sleeve cooperates with the inner wall of the first cavity for guidance.

3. A novel hole opener connecting rod according to claim 2, characterized in that: The upper cover is provided with a third accommodating cavity located on the first cavity, the inner diameter of the third accommodating cavity is smaller than the inner diameter of the first cavity, and an elastic component is accommodated in the third accommodating cavity. The elastic component is axially movably sleeved on the outer circle of the main body, and the lower end of the elastic component passes through the first cavity and abuts against the upper surface of the positioning member.

4. The novel hole opener connecting rod according to claim 1 is characterized in that: The ejection mechanism comprises an ejection block, an ejection spring and a spring fixing ring; the ejection spring is installed in the first accommodating cavity through the spring fixing ring; one end of the ejection block abuts against the ejection spring, and the other end abuts against the quick conversion head.

5. The novel hole opener connecting rod according to claim 1 is characterized in that: A drill positioning hole is provided at the lower end or the middle part of the drill limiting sleeve; after the positioning drill is assembled on the drill limiting sleeve, the positioning drill is limited by a drill limiting screw.

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

7. A new type of hole opener connecting rod, characterized in that: It comprises a handle assembly and a hole-opening assembly, the upper end of the handle assembly is connected to the hole-opening assembly, the lower end of the handle assembly is connected to a driving assembly to drive the hole-opening assembly to rotate, the handle assembly is detachably connected to the hole-opening assembly, the handle assembly comprises a drill limit sleeve and a limit mechanism, the hole-opening assembly comprises a quick-conversion head; the limit mechanism comprises a limit steel ball, a sliding sleeve and an upper cover; the upper end of the drill limit sleeve is provided with a first accommodating cavity which is mounted in cooperation with the lower end of the quick-conversion head; an ejection mechanism is arranged in the first accommodating cavity; the inner circular side wall of the sliding sleeve is divided into an upper inner circular side wall and a lower inner circular side wall; the diameter of the upper inner circular side wall is smaller than the diameter of the lower inner circular side wall; a steel ball fixing hole for mounting the limit steel ball is arranged on the upper inner circular side wall; the A first positioning groove is provided at the lower end of the quick-change head, and the limiting steel ball cooperates with the first positioning groove to limit the position; the upper cover is fixedly connected to the drill bit limiting sleeve; when the sliding sleeve is pulled backward along the axial direction of the drill bit limiting sleeve, the upper inner circular side wall leaves the limiting steel ball so that the limiting steel ball has an air-avoiding space to reach an unlocked state, and at the same time the quick-change head is ejected by the ejection mechanism; when the sliding sleeve is reset to the normal position by the reset assembly, the limiting steel ball is in the matching position of the upper inner circular side wall, and the limiting steel ball cooperates with the upper inner circular side wall to lock and reach a locked state; the locking state and the unlocking state are formed by the cooperation between the limiting steel ball and the sliding sleeve so that the drill bit limiting sleeve and the quick-change head are locked or unlocked.

8. The novel hole opener connecting rod according to claim 7 is characterized in that: The reset assembly includes a positioning pin and a reset spring; the positioning pin passes through the drill limit sleeve and the upper cover in sequence; the lower end of the positioning pin is knurled and riveted to the sliding sleeve; the reset spring is sleeved on the positioning pin; a limited end is provided at the upper end of the positioning pin; the upper end of the reset spring abuts against the limited end; the lower end of the reset spring abuts against the inner hole of the upper cover; when the sliding sleeve is pulled backward along the axial direction of the drill limit sleeve, the reset spring is in a compressed state.

9. The novel hole opener connecting rod according to claim 7, characterized in that: The upper cover is fixedly connected to the drill bit limiting sleeve by screws.

10. The novel hole opener connecting rod according to claim 7, characterized in that: Two positioning planes are symmetrically arranged at the opening of the first accommodating cavity.

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