Hole opener

Abstract

The utility model provides a tapper which comprises a cutter handle, a drill bit arranged in the middle of the cutter handle and a plurality of blade assemblies arranged on the cutter handle in the circumferential direction of the drill bit at intervals, and each blade assembly is provided with a blade. The multiple blade assemblies are in transmission connection through a transmission mechanism, and the blades of the multiple blade assemblies can be synchronously close to or away from the drill bit through the transmission mechanism. According to the tapper, the multiple blade assemblies are in transmission connection through the transmission mechanism, the blades of the multiple blade assemblies can be synchronously close to or away from the drill bit through the transmission mechanism, linkage adjustment of the positions of the multiple blades is facilitated, through holes with different diameters can be formed in the tapper, and the tapper has good universality; and compared with a traditional mode that the positions of all the blades are adjusted independently, the adjusting efficiency is high.

Description

Technical Field

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

[0002] A hole opener is a common tool for thin plate products. It is installed on drilling equipment to process holes in products or parts according to the hole diameter requirements. There are two common types of hole openers: one is fixed and the other is adjustable. The fixed hole opener is cylindrical, with a drill bit installed in the center for centering. Several blades are welded on the port. The outer diameter of the blade determines the diameter of the processed hole. The adjustable hole opener is also called an airplane-type hole opener. It consists of a handle, a crossbeam, a blade, a center drill bit, etc. The blade can move on the crossbeam, and the moving distance and size are determined by the positioning holes or positioning grooves on the crossbeam.

[0003] The diameter of the fixed hole opener in the prior art is fixed, and each hole opener can only process holes of one size. If a product has multiple holes of different sizes, it is necessary to prepare a hole opener for each size, which directly increases the production cost of the product.

[0004] However, the adjustable hole opener in the prior art is too simple in structure with only two blades, poor overall strength and rigidity, poor stability during use, and easy to be damaged when rotating at high speed, causing the blades to fly out and cause danger. The adjustable size range can only be determined by the positioning holes or positioning slots of the crossbeam, and the size between adjacent positioning holes or positioning slots cannot be adjusted. The two blades need to be adjusted separately, which makes the blade adjustment process complicated and difficult to operate. In addition, the blades are all connected by welding, which makes it difficult to replace the blades after they are damaged. Utility Model Content

[0005] In view of this, the utility model aims to provide a hole opener to improve its versatility.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A hole opener comprises a tool handle, a drill bit arranged in the middle of the tool handle, and a plurality of blade assemblies arranged on the tool handle at intervals along the circumference of the drill bit, each of the blade assemblies having a blade; the plurality of blade assemblies are connected to each other through a transmission mechanism, and the blades of the plurality of blade assemblies can synchronously approach or move away from the drill bit through the transmission mechanism.

[0008] Furthermore, each of the blade assemblies includes a lead screw rotatably mounted on the tool handle, and a mounting seat mounted on the lead screw, and a limiting portion for limiting the rotation of the mounting seat is provided between the mounting seat and the tool handle; the blade of each blade assembly is provided on the mounting seat.

[0009] Furthermore, the transmission mechanism includes a first bevel gear rotatably arranged on the tool handle, and a plurality of second bevel gears arranged one-to-one corresponding to the plurality of blade assemblies; each of the second bevel gears is coaxially arranged with the lead screw of each of the blade assemblies and connected together.

[0010] Furthermore, the mounting seat has two clamping blocks arranged opposite to each other, a clamping space for clamping the blade is formed between the two clamping blocks, the two clamping blocks are connected by a threaded connector, and the blade is clamped in the clamping space; and / or, corresponding to the two ends of each lead screw, two fixing blocks connected by threaded connection are provided on the tool handle, and the two fixing blocks at the same end are surrounded by a mounting hole, and the two ends of the lead screw are respectively rotatably arranged in the corresponding mounting holes.

[0011] Furthermore, the limiting portion includes a limiting groove provided on the tool handle along the axial direction of the lead screw, and a limiting protrusion provided on the mounting seat; the limiting protrusion is inserted in the limiting groove.

[0012] Furthermore, the tool handle is provided with scale lines for indicating the sliding displacement of the mounting seat; and / or, the tool handle includes a main body, and a mounting body arranged outside the main body, the mounting body has mounting arms corresponding to multiple blade assemblies one by one, each of the mounting arms extends radially along the main body, the drill bit is arranged on the main body, and each of the blade assemblies is arranged on the corresponding mounting arm.

[0013] Furthermore, the hole opener also includes a discharge spring arranged on the tool handle, and the discharge spring is sleeved outside the drill bit.

[0014] Furthermore, along the direction pointing to the free end of the drill bit, the outer diameter of the unloading spring gradually increases.

[0015] Furthermore, the drill bit is inserted into the tool handle, and a limiting structure is provided between the tool handle and the drill bit, wherein the limiting structure is used to limit the rotation of the drill bit relative to the tool handle.

[0016] Furthermore, the limiting structure includes a groove provided on the outer wall of the drill bit, and a top screw threaded on the tool handle, one end of the top screw is inserted into the groove and pressed against the drill bit.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The hole opener described in the utility model enables multiple blade assemblies to be connected through a transmission mechanism, and the blades of the multiple blade assemblies can be synchronously moved closer to or away from the drill bit through the transmission mechanism, which is conducive to the linkage adjustment of multiple blade positions. Not only can the hole opener open through holes with different diameters and has good versatility, but also has higher adjustment efficiency compared with the traditional method of adjusting each blade position separately.

[0019] In addition, the screw is rotatably arranged on the mounting seat, which is convenient for the arrangement and installation of the screw. The limit part is convenient for preventing the mounting seat from rotating synchronously with the screw. The blade assembly is arranged on the mounting seat, which has a high adjustment accuracy. The mounting block can also be adjusted to any position, thereby realizing stepless adjustment of the blade position, and further improving the adjustment flexibility of the hole opener. The arrangement of the first bevel gear and multiple second bevel gears in the transmission mechanism is convenient for realizing the linkage between the blade assemblies, and the structure of the bevel gear is simple, which is convenient for arrangement and implementation while having a high adjustment accuracy. The two clamping blocks cooperate with the connecting piece to install the blade on the mounting seat, which is convenient for installing and disassembling the blade, thereby meeting different usage requirements and facilitating the maintenance of the blade. The arrangement of the two fixed blocks is convenient for the rotation and installation of the screw on the handle.

[0020] In addition, the structures of the limiting groove and the limiting protrusion are simple, and the limiting effect of the two is good. By setting a scale line on the shank, it is convenient to indicate the sliding displacement of the mounting seat, that is, the sliding displacement of the blade, so as to further improve the convenience of adjusting the blade position; the structure of the main body and the mounting body is simple, which is convenient for arrangement and implementation; by setting a plurality of mounting arms, it is convenient for arranging the blade assembly, and it is also convenient to reduce the weight of the mounting body, so as to facilitate the lightweighting of the hole opener. The discharge spring is arranged outside the drill bit, which is convenient for separating the waste material formed by the hole from the blade, and further improving the use effect of the hole opener. The outer diameter of the discharge spring is gradually increased in the direction pointing to the free end of the drill bit, which is conducive to improving the pushing effect of the discharge spring on the waste material. The limiting structure is arranged between the shank and the drill bit, which is conducive to further improving the use stability of the drill bit. The structure of the groove and the top screw is simple, which is convenient for arrangement and implementation, and the limiting effect of the two is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic structural diagram of the hole opener according to an embodiment of the utility model at a first viewing angle;

[0023] Figure 2 It is a schematic structural diagram of the hole opener according to an embodiment of the utility model at a second viewing angle;

[0024] Figure 3 It is a schematic structural diagram of the embodiment of the present utility model from the third perspective;

[0025] Figure 4 It is a schematic structural diagram of the installation body of the embodiment of the present utility model from one perspective;

[0026] Figure 5 It is a schematic structural diagram of the installation body of the embodiment of the present utility model from another perspective;

[0027] Figure 6 It is a schematic structural diagram of one installation arm of the embodiment of the present utility model; Figure 7 It is a schematic structural diagram of the transmission mechanism of the embodiment of the present utility model;

[0028] Figure 8 It is a schematic structural diagram of the first bevel gear of the embodiment of the present utility model;

[0029] Figure 9 It is a schematic structural diagram of the mounting base of the embodiment of the present utility model from one perspective;

[0030] Figure 10 It is a schematic structural diagram of the mounting base of the embodiment of the present utility model from another perspective;

[0031] Figure 11 It is a schematic structural diagram of two fixing blocks of the embodiment of the present utility model;

[0032] Figure 12 It is a schematic structural diagram of the drill bit of the embodiment of the present utility model.

[0033] Explanation of reference numerals:

[0034] 1, main body; 2, installation body; 3, drill bit; 4, blade; 5, lead screw; 6, mounting base; 7, unloading spring;

[0035] 100, tool handle; 101, first bevel gear; 102, fixing block; 103, first connecting piece; 104, first set screw; 105, mounting hole;

[0036] 201, installation arm; 202, limiting groove; 203, scale line;

[0037] 301, groove; 302, second set screw;

[0038] 501, second bevel gear; 502, operating block;

[0039] 601, second connecting piece; 602, clamping block; 603, limiting protrusion; 604, indicating arrow; 605, clamping space. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0044] This embodiment relates to a hole opener, which improves the versatility of use and the convenience of adjustment of the hole opener by optimizing its own structure.

[0045] In terms of overall structure, the hole opener includes a handle 100, a drill bit 3 disposed in the middle of the handle 100, and a plurality of blade assemblies disposed on the handle 100 at intervals along the circumference of the drill bit 3, each blade assembly having a blade 4. The plurality of blade assemblies are connected to each other through a transmission mechanism, and the blades 4 of the plurality of blade assemblies can be synchronously moved close to or away from the drill bit 3 through the transmission mechanism.

[0046] The hole opener described in this embodiment enables multiple blade assemblies to be connected to each other through a transmission mechanism, and the blades 4 of the multiple blade assemblies can be synchronously moved close to or away from the drill bit 3 through the transmission mechanism, which is beneficial to the linkage adjustment of the positions of the multiple blades 4. Not only does the hole opener enable through holes of different diameters to be opened, which has good versatility, but it also has higher adjustment efficiency compared to the traditional method of adjusting the position of each blade 4 individually.

[0047] Based on the above overall introduction, an exemplary structure of the hole opener in this embodiment is as follows: Figures 1 to 3As shown in the figure. As a preferred embodiment, each blade assembly includes a lead screw 5 rotatably arranged on the tool handle 100, and a mounting seat 6 arranged on the lead screw 5, and a limiting portion for restricting the rotation of the mounting seat 6 is provided between the mounting seat 6 and the tool handle 100. The blade 4 of each blade assembly is arranged on the mounting seat 6. Here, the rotation setting of the lead screw 5 on the installation is conducive to the installation of the lead screw 5, the limiting portion is conducive to preventing the mounting seat 6 from rotating synchronously with the lead screw 5, and the blade assembly is arranged on the mounting seat 6, which has a high adjustment accuracy, and the mounting seat 6, that is, the blade 4, can also be adjusted to any position, so as to realize the stepless adjustment of the position of the blade 4, which is conducive to further improving the adjustment flexibility of the hole opener.

[0048] Specifically, as shown in Figure 1 In the figure, the tool handle 100 in this embodiment includes a main body 1 and a mounting body 2 arranged outside the main body 1. The mounting body 2 has mounting arms 201 corresponding to a plurality of blade assemblies one by one. Each mounting arm 201 extends radially along the main body 1. The drill bit 3 is arranged on the main body 1, and each blade assembly is arranged on the corresponding mounting arm 201. In this embodiment, the main body 1 is used to be mounted on a drilling device. The main body 1 and the mounting body 2 are relatively fixedly arranged. The main body 1 can be driven to rotate to drive the mounting arms 201 to rotate synchronously, and the blade 4 is used to open a hole in the workpiece to be opened.

[0049] Among them, in addition to being circular as shown in the figure, the cross-section of the main body 1 can also be other polygons. The drill bit 3 is mounted on one side of the main body 1 facing the workpiece to be opened, and the drill bit 3 is used for determining the center position of the hole opening and centering during the drilling process to ensure its stability. Here, the structures of the main body 1 and the mounting body 2 are simple and convenient for layout and implementation. By arranging a plurality of mounting arms 201, while facilitating the arrangement of the blade assemblies, it is also conducive to reducing the weight of the mounting body 2, thereby facilitating the lightweight of the hole opener.

[0050] As a feasible embodiment, as shown in Figure 1 In the figure, the number of blade assemblies is four, and the mounting arms 201 are four arranged at equal angular intervals along the circumference of the main body 1. Through the cooperation of the four blades 4, it is conducive to improving the hole opening efficiency of the hole opener and the stability during the hole opening process. Of course, during specific implementation, the number of blade assemblies can still be adjusted according to the use requirements. At this time, the number of mounting arms 201 is set corresponding to the number of blade assemblies one by one.

[0051] As a preferred embodiment, as shown in Figure 3 and Figure 7As shown in the figure, the transmission mechanism in this embodiment includes a first bevel gear 101 rotatably provided on the tool shank 100, and a plurality of second bevel gears 501 provided corresponding to the plurality of blade assemblies one by one. Each second bevel gear 501 is coaxially arranged with the lead screw 5 of each blade assembly and connected together. The arrangement of the first bevel gear 101 and the plurality of second bevel gears 501 in the transmission mechanism facilitates the realization of the linkage between the blade assemblies, and the structure of the bevel gear is simple, which is convenient for layout and implementation, and at the same time has high transmission stability and adjustment accuracy.

[0052] Specifically, the first bevel gear 101 is rotatably arranged on the main body 1 and is located on the side of the mounting body 2 facing the workpiece to be drilled. Each second bevel gear 501 is respectively fixed to one end of the lead screw 5 facing the main body 1 and is meshed and connected to the first bevel gear 101. When any one of the lead screws 5 is driven to rotate, the first bevel gear 101 can be driven to rotate through the second bevel gear 501 thereon, and then the other second bevel gears 501 can be synchronously driven to rotate, so that the position of the mounting seat 6 on the corresponding lead screw 5 is adjustable, and the plurality of blades 4 can approach or move away from the drill bit 3 synchronously, thereby adjusting the drilling diameter of the drill.

[0053] For the convenience of installing the lead screw 5, in this embodiment, as Figure 3 shown in the figure, corresponding to both ends of each lead screw 5, two fixing blocks 102 are provided on the tool shank 100 and are screwed together, and two fixing blocks 102 at the same end enclose an installation hole 105, and both ends of the lead screw 5 are respectively rotatably arranged in the corresponding installation holes 105. The arrangement of the two fixing blocks 102 cooperating to form the installation hole 105 here is conducive to the installation of the lead screw 5.

[0054] In terms of the specific structure, as Figure 11 shown in the figure, the two fixing blocks 102 are arranged up and down, and each fixing block 102 is provided with a semi-circular hole. The first connecting member 103, such as a bolt, etc., passes through the lower fixing block 102 and the upper fixing block 102 in sequence and is screwed to the mounting arm 201, so that the semi-circles on the two fixing blocks 102 are spliced into a complete installation hole 105. The second bevel gear 501 is located on the side of the fixing block 102 facing the first bevel gear 101. Among them, two bolts can be arranged at intervals here, which is conducive to improving the connection firmness of the two fixing blocks 102 on the mounting arm 201.

[0055] In this embodiment, both ends of the lead screw 5 are rotatably arranged on the mounting arm 201 through the cooperation of the two fixing blocks 102 to form the installation hole 105, which has the advantages of convenient installation and disassembly. At the same time, it is also conducive to improving the stability of the lead screw 5 during use, so that the lead screw 5 can only rotate around its own axis and cannot move along its own axis.

[0056] The structure of the mounting seat 6 in this embodiment is as Figure 9 and Figure 10As shown in , the mounting seat 6 is provided with a threaded hole which is sleeved on the lead screw 5 and is threadedly connected to the lead screw 5, and the top of the mounting seat 6 is slidably arranged on the corresponding mounting arm 201. As a preferred embodiment, the limiting portion includes a limiting groove 202 arranged on the shank 100 along the axial direction of the lead screw 5, and a limiting protrusion 603 arranged on the mounting seat 6, and the limiting protrusion 603 is inserted into the limiting groove 202. Here, the limiting groove 202 and the limiting protrusion 603 have simple structures, and the limiting effect of the cooperation between the two is good.

[0057] In terms of specific structure, Figure 5 and Figure 9 As shown in the figure, the cross section of the limiting groove 202 is in the shape of an "I" character, and the shape of the limiting protrusion 603 is adapted to the shape of the limiting groove 202 and is also in the shape of an "I" character, which is not only convenient for processing and forming, but also can effectively prevent the mounting seat 6 from rotating relative to the mounting arm 201, thereby ensuring that the blade 4 can only move along the axial direction of the lead screw 5, and has good adjustment accuracy. At the same time, the sliding of the limiting protrusion 603 in the limiting groove 202 is also conducive to improving the stability of the mounting seat 6 during movement. Of course, in the specific implementation, the cross-sectional shape of the limiting groove 202 can be other non-circular geometric shapes in addition to the "I" shape shown in the figure. At this time, the shape of the limiting protrusion 603 is adapted to the shape of the limiting groove 202, so that the mounting seat 6 cannot rotate with the lead screw 5.

[0058] like Figure 9 and Figure 10 As shown in the figure, the blade 4 is installed on the top of the mounting seat 6 to facilitate the arrangement and installation of the blade 4. In this embodiment, the mounting seat 6 has two clamping blocks 602 arranged opposite to each other, and a clamping space 605 for clamping the blade 4 is formed between the two clamping blocks 602. The two clamping blocks 602 are connected by a connecting member with a thread, and the blade 4 is clamped in the clamping space 605. In order to distinguish it from the first connecting member 103 mentioned above, the connecting member used for installation on the clamping block 602 is called the second connecting member 601. The two clamping blocks 602 cooperate with the second connecting member 601 to install the blade 4 on the mounting seat 6, which is convenient for disassembly of the blade 4, thereby facilitating meeting different usage requirements, and at the same time, it is also convenient for maintenance of the blade 4.

[0059] In terms of detailed structure, the tops of the two clamping blocks 602 are abutted, the clamping space 605 is located at the bottom of the two clamping blocks 602, and the top of the blade 4 in the installed state abuts the top of the clamping space 605, and the two sides abut against the two clamping blocks 602 respectively. The second connecting member 601 is specifically connected to the tops of the two clamping blocks 602. The second connecting member 601 here can also be a bolt, which passes through one clamping block 602 and is screwed to the other clamping block 602, thereby clamping the blade 4 between the two clamping blocks 602.

[0060] In this embodiment,Figure 2 As shown, to facilitate the adjustment of the lead screw 5, at one end of each lead screw 5 away from the main body 1, there is an operating block 502 located outside the fixing block 102 at this end. The cross-section of the operating block 502 is polygonal, so as to facilitate the external force to operate the operating block 502 to rotate, and then drive the lead screw 5 to rotate, thereby adjusting the position of the blade 4. Here, the structure of the operating block 502 is simple, easy to arrange and implement, and has a good use effect.

[0061] In this embodiment, to lock the mounting seat 6 that has moved in place and prevent the rotation of the lead screw 5 from affecting the position of the blade 4. As Figure 2 shown, a first set screw 104 is screwed on the fixing block 102 arranged lower. One end of the first set screw 104 is inserted into the mounting hole 105 and abuts against the lead screw 5, thereby locking the adjusted lead screw 5 so that the lead screw 5 cannot rotate, that is, the mounting seat 6 and the blade 4 thereon are fixedly arranged relative to the lead screw 5.

[0062] To further improve the use effect of the hole opener, as Figure 2 and Figure 6 shown, a scale line 203 for indicating the sliding displacement of the mounting seat 6 is provided on the tool handle 100. By providing the scale line 203 on the tool handle 100, it is beneficial to indicate the sliding displacement of the mounting seat 6, that is, the displacement of the blade 4, thereby further improving the convenience when adjusting the position of the blade 4. Specifically, the scale line 203 is arranged at intervals along the length direction of the mounting arm 201 on one side in the width direction of the mounting arm 201, and is arranged close to the lower edge of the mounting arm 201.

[0063] In addition, an indicating arrow 604 is provided at the top on one side in the width direction of the mounting seat 6 and is arranged towards the scale line 203. By making the indicating arrow 604 point to the corresponding scale line 203, the sliding displacement of the mounting seat 6 can be known, so as to facilitate adjusting the opening diameter of multiple blades 4 to the target value, which is beneficial to further improving the opening efficiency.

[0064] To facilitate directly reading the displacement amount of the mounting seat 6, as Figure 6 shown, scale values corresponding to some of the scale lines 203 are also provided on the mounting arm 201 at intervals. Among them, the zero point of the scale value is located on the axis of the main body 1, and in the extending direction of the mounting arm 201, the scale value gradually increases along the direction away from the main body 1. The scale value corresponding to the scale line 203 pointed by the indicating arrow 604 is specifically: the distance between the mounting seat 6 and the axis of the main body 1. Of course, the indicating arrow 604 can also be made to correspond one by one with the position of the blade 4 up and down. At this time, the scale value pointed by the indicating arrow 604 is equal to the radius that the blade assembly can open a hole. In this embodiment, when adjusting the position of the blade 4, by reading the scale value pointed by the indicating arrow 604, it can be determined whether the mounting seat 6 has moved in place.

[0065] In addition, as shown in Figure 2 and Figure 8 , the hole opener in this embodiment further includes a discharge spring 7 provided on the tool handle 100, and the discharge spring 7 is sleeved outside the drill bit 3. By sleeving the discharge spring 7 outside the drill bit 3 here, it is beneficial for the waste formed by the hole opening to be separated from the blade 4, and further improves the use effect of the drill bit 3. As a preferred implementation manner, the top end of the discharge spring 7 is fixed to the main body 1. Along the direction pointing to the free end of the drill bit 3, the outer diameter of the discharge spring 7 gradually increases, which is beneficial to improving the pushing effect of the discharge spring 7 on the waste, and thus is beneficial to improving the blanking efficiency of the waste.

[0066] As a preferred implementation manner, the drill bit 3 in this embodiment is inserted into the tool handle 100, and a limiting structure is provided between the tool handle 100 and the drill bit 3, and the limiting structure is used to limit the rotation of the drill bit 3 relative to the tool handle 100. By providing the limiting structure between the tool handle 100 and the drill bit 3 here, it is beneficial to further improve the use stability of the drill bit 3.

[0067] Specifically, as shown in Figure 8 and Figure 12 , the drill bit 3 is specifically inserted on the main body 1. The limiting structure in this embodiment includes a groove 301 provided on the outer wall of the drill bit 3, and a setscrew screwed on the tool handle 100. One end of the setscrew is inserted into the groove 301 and abuts against the drill bit 3. To distinguish it from the above-mentioned first setscrew 104, the setscrew in the limiting structure is called the second setscrew 302. Among them, the groove 301 is in a "U" shape, and the bottom of the groove 301 is a cutting plane, which is beneficial to preventing the drill bit 3 from rotating relative to the main body 1 and axial movement. The structures of the groove 301 and the second setscrew 302 here are simple and convenient to arrange and implement, and the limiting effect of their cooperation is good. The drill bit 3 can be locked on the main body 1 to prevent the drill bit 3 from rotating relative to the main body 1, and at the same time, the axial displacement of the drill bit 3 can also be restricted.

[0068] When the hole opener in this embodiment is in use, the main body 1 of the hole opener is installed on the drilling equipment, the first setscrew 104 is loosened, and the operating block 502 is rotated to adjust the radial dimension of the circumferentially distributed blades 4 (taking the hole opening size of φ72mm as an example). Rotate the operating block 502 to make the lead screw 5 rotate. The second bevel gear 501 at the other end of the lead screw 5 drives the first bevel gear 101 at the center to rotate. All the other second bevel gears 501 meshed with the first bevel gear 101 rotate simultaneously and drive all the lead screws 5 to rotate. The rotation of the lead screws 5 drives all the mounting seats 6 to slide. When reaching the scale of 72mm to be reached, at this time, the tool diameter is adjusted to 72mm, and then the first setscrew 104 is tightened to complete the adjustment of the hole opener.

[0069] Then the drilling device is started, the handle 100 of the hole opener rotates at high speed, and the drill bit 3 is aligned with the center of the processed hole for axial feeding. As the cutting depth of the blade 4 increases, the depth of the drill bit 3 inserted into the waste material also increases, and the discharge spring 7 is compressed to store energy. Until the blade 4 completes the hole opening, the hole opener withdraws from the processed part axially, and the rotation of the drilling device is stopped. At this time, the discharge spring 7 releases the stored energy and removes the waste material from the hole opener, thereby completing the hole opening operation of the hole opener.

[0070] All parts of the hole opener of this embodiment are flexibly connected to facilitate assembly and disassembly. Bolts, gears, blades 4, drill bits 3 and unloading springs 7 are standard parts to facilitate replacement and maintenance of damaged parts. In addition, the position of the blade 4 in the hole opener is adjusted by thread adjustment in conjunction with the lead screw 5, with high adjustment accuracy and stepless adjustment. Moreover, all the lead screws 5 are connected by bevel gear meshing, so that all the lead screws 5 can be linked by adjusting any one of the lead screws 5, which is beneficial to improving the adjustment efficiency and convenience. Moreover, the blade 4 is pressed in a clamping manner instead of the traditional blade 4 welding fixing method, which is beneficial to the rapid replacement of the blade 4, thereby having better flexibility of use and helping to extend the service life of the hole opener.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hole opener, characterized in that: The invention comprises a tool handle (100), a drill bit (3) arranged in the middle of the tool handle (100), and a plurality of blade assemblies arranged on the tool handle (100) at intervals along the circumference of the drill bit (3), each blade assembly comprising a blade (4); The plurality of blade assemblies are connected to each other through a transmission mechanism, and the blades (4) of the plurality of blade assemblies can synchronously approach or move away from the drill bit (3) through the transmission mechanism.

2. The hole opener according to claim 1, characterized in that: Each of the blade assemblies comprises a lead screw (5) rotatably arranged on the knife handle (100), and a mounting seat (6) arranged on the lead screw (5), and a limiting portion for limiting the rotation of the mounting seat (6) is provided between the mounting seat (6) and the knife handle (100); The blade (4) of each blade assembly is arranged on the mounting seat (6).

3. The hole opener according to claim 2, characterized in that: The transmission mechanism comprises a first bevel gear (101) rotatably arranged on the knife handle (100), and a plurality of second bevel gears (501) arranged in one-to-one correspondence with the plurality of blade assemblies; Each of the second bevel gears (501) is coaxially arranged with the lead screw (5) of each of the blade assemblies and is connected together.

4. The hole opener according to claim 3, characterized in that: The mounting seat (6) has two clamping blocks (602) arranged opposite to each other, a clamping space (605) for clamping the blade (4) is formed between the two clamping blocks (602), and the two clamping blocks (602) are connected via a connecting piece having a thread, and the blade (4) is clamped in the clamping space (605); and / or, Corresponding to the two ends of each lead screw (5), the tool handle (100) is provided with two fixing blocks (102) which are screwed together, and the two fixing blocks (102) at the same end are surrounded by a mounting hole (105), and the two ends of the lead screw (5) are respectively rotatably arranged in the corresponding mounting holes (105).

5. The hole opener according to claim 2, characterized in that: The limiting portion comprises a limiting groove (202) provided on the tool handle (100) along the axial direction of the lead screw (5), and a limiting protrusion (603) provided on the mounting seat (6); The limiting protrusion (603) is inserted into the limiting groove (202).

6. The hole opener according to claim 2, characterized in that: The knife handle (100) is provided with a scale line (203) for indicating the sliding displacement of the mounting seat (6); and / or, The tool handle (100) comprises a main body (1) and a mounting body (2) arranged outside the main body (1), the mounting body (2) having mounting arms (201) corresponding to a plurality of blade assemblies one by one, each of the mounting arms (201) extending radially along the main body (1), the drill bit (3) being arranged on the main body (1), and each of the blade assemblies being arranged on a corresponding mounting arm (201).

7. The hole opener according to claim 1, characterized in that: The hole opener also includes a discharge spring (7) arranged on the tool handle (100), and the discharge spring (7) is sleeved outside the drill bit (3).

8. The hole opener according to claim 7, characterized in that: Along the direction pointing to the free end of the drill bit (3), the outer diameter of the discharge spring (7) gradually increases.

9. The hole opener according to any one of claims 1 to 8, characterized in that: The drill bit (3) is inserted into the tool handle (100), and a limiting structure is provided between the tool handle (100) and the drill bit (3), wherein the limiting structure is used to limit the rotation of the drill bit (3) relative to the tool handle (100).

10. The hole opener according to claim 9, characterized in that: The limiting structure comprises a groove (301) provided on the outer wall of the drill bit (3), and a top screw threadedly connected to the tool handle (100); one end of the top screw is inserted into the groove (301) and pressed against the drill bit (3).

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