A high-strength bolt tapping device

Abstract

The present invention relates to the technical field of bolt production and processing, and specifically provides a high-strength bolt tapping device, which includes a frame. A turning tool and a sliding frame are arranged on the frame. A main shaft is arranged inside the sliding frame. The main shaft can clamp one end of a cylindrical bar, and a rotating guide sleeve is also arranged on the frame to position the other end of the cylindrical bar. An auxiliary positioning component is arranged inside the rotating guide sleeve. The auxiliary positioning component can make the positioned position on the outer circumference of the cylindrical bar close to the turning tool and the positioned position does not change, thereby preventing the problem of decreased turning thread accuracy caused by the positioned position on the outer circumference of the cylindrical bar being too far from the turning tool or disengaging from the auxiliary positioning component. Furthermore, it can adapt to the positioning of cylindrical bars with different diameters, and at the same time, the cylindrical bar does not need to be processed in segments when processing a long thread, but can be directly processed to the required length, greatly improving the processing efficiency of long threads.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt production and processing, and particularly to a tapping device for high-strength bolts. Background Art

[0002] Bolts are widely used and there are many classifications of bolts. Bolt production and processing is aimed at producing bolts suitable for corresponding occasions under different usage scenarios, and different processing methods are used for different bolts.

[0003] For example, a bolt tapping device grinds the surface of a bolt to process threads. Specifically, a grinding tool is arranged on a frame, the other end of the bolt is clamped by a sliding headstock, and while the sliding headstock drives the whole bolt to rotate at a high speed, it moves along the axial direction of the bolt to process the surface threads. However, when processing high-strength bolts with a long length, in order to ensure the positioning effect of the guide sleeve on the bolt, the sliding headstock needs to process in sections, that is, the grinding tool needs to process in sections, and the sliding headstock clamps the bolt in sections. It is necessary for the sliding headstock to drive the bolt to move back and forth several times to complete the processing, which reduces the efficiency. Moreover, the traditional guide sleeve will cause a large eccentric force on the long bolt during positioning, affecting the processing accuracy of the bolt. Summary of the Invention

[0004] Based on this, in view of the problems of low bolt processing efficiency and poor accuracy existing in the current bolt tapping device when processing long bolts, it is necessary to provide a tapping device for high-strength bolts.

[0005] The above object is achieved by the following technical solutions:

[0006] A tapping device for high-strength bolts, comprising:

[0007] A frame, on which a main shaft and a rotating guide sleeve are arranged. The main shaft can clamp a cylindrical bar and rotate around its own axis and move along the axial direction of the cylindrical bar. The rotating guide sleeve is rotatably arranged on the frame. The cylindrical bar is coaxially arranged and passes through the inner circumference of the rotating guide sleeve. The main shaft is coaxially and telescopically connected to the rotating guide sleeve, and the main shaft drives the rotating guide sleeve to rotate synchronously;

[0008] A driving component, which can drive the main shaft to rotate around its own axis and can drive the main shaft to move along its axial direction;

[0009] A turning tool, which is arranged on the frame and close to one end of the rotating guide sleeve. The turning tool can turn threads on the outer circumference of the cylindrical bar;

[0010] Auxiliary positioning component, the auxiliary positioning component includes a guiding head, a plurality of abutting blocks, a sliding rod and an elastic member. The guiding head is slidably disposed on the inner circumference of the rotating guide sleeve and can axially slide along the inner circumference of the rotating guide sleeve. The plurality of abutting blocks are slidably disposed on the side wall of the guiding head and can move radially along the guiding head. The plurality of abutting blocks can abut against the outer circumference of the cylindrical bar stock. The sliding rod is slidably inserted through the side wall of the guiding head and is distributed radially along the side wall of the guiding head. One end of the sliding rod is hinged in the middle of the abutting block, and the other end of the sliding rod slidably abuts against the inner circumference of the rotating guide sleeve. The inner circumference of the rotating guide sleeve has a first tapered surface, and the end of the sliding rod that abuts against the inner circumference of the rotating guide sleeve has a second tapered surface. The first tapered surface and the second tapered surface are adapted to each other. One end of the elastic member is connected to the guiding head, and the other end of the elastic member is connected to the rotating guide sleeve. The elastic member can push the guiding head to axially move along the rotating guide sleeve;

[0011] Connecting rod, one end of the connecting rod is hinged to the abutting block, and the other end of the connecting rod is hinged to the inner circumference of the guiding head. And the end of the connecting rod hinged to the inner circumference of the guiding head can axially slide along the guiding head. During the axial movement of the cylindrical bar stock, different diameters of the outer circumference of the cylindrical bar stock abut against the connecting rod;

[0012] When the abutting block is in a horizontal state, the abutting block abuts against the outer circumference of the cylindrical bar stock or the outer circumference of the processed thread;

[0013] When the abutting block is in an inclined state, the abutting block abuts against both the outer circumference of the cylindrical bar stock and the outer circumference of the processed thread at the same time.

[0014] Further, the auxiliary positioning component further includes a sliding rod and an elastic member. One end of the sliding rod is hinged in the middle of the abutting block, and the other end of the sliding rod slidably abuts against the inner circumference of the rotating guide sleeve. The inner circumference of the rotating guide sleeve has a first tapered surface, and the end of the sliding rod that abuts against the inner circumference of the rotating guide sleeve has a second tapered surface. One end of the elastic member is connected to the guiding head, and the other end of the elastic member is connected to the rotating guide sleeve. The elastic member can push the guiding head to axially move along the rotating guide sleeve.

[0015] Further, a connecting plate is detachably disposed between the elastic member and the guiding head.

[0016] Further, the elastic member is a compression spring.

[0017] Further, a roller is rotatably disposed at one end of the abutting block away from the connecting rod, and the axis of the roller is perpendicular to the axis of the cylindrical bar stock. The roller is in rolling contact with the outer circumference of the cylindrical bar stock or the outer circumference of the processed thread.

[0018] Furthermore, a slide groove is provided on the inner side wall of the guide head, and there are multiple slide grooves, which are arranged in a circular array on the inner periphery of the guide head. The multiple slide grooves extend along the axial direction of the guide head, and a slider is hinged at one end of the connecting rod, and the slider is slidably arranged in the slide groove.

[0019] Furthermore, a telescopic sleeve is provided between the main shaft and the rotating guide sleeve. The telescopic sleeve can be telescoped along the axial direction of the main shaft. One end of the telescopic sleeve is connected to the rotating guide sleeve, and the other end of the telescopic sleeve is connected to the main shaft.

[0020] Furthermore, the telescopic sleeve includes a first sleeve and a second sleeve, the first sleeve and the second sleeve are socketed with each other, a limiting groove distributed along its axial direction is provided on the side wall of the first sleeve, a protrusion is provided on the outer periphery of the second sleeve, and the protrusion is located in the limiting groove, and the ends of the first sleeve and the second sleeve that are away from each other are respectively connected to the main shaft and the rotating guide sleeve.

[0021] Furthermore, the drive assembly includes a first drive motor and a second drive motor, the rotating shaft of the first drive motor is engaged with the main shaft, the rotation of the first drive motor drives the main shaft to rotate, a sliding frame is provided on the frame, the sliding frame can move along the axial direction of the main shaft on the frame, and the second drive motor can drive the sliding frame to move.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides an auxiliary positioning component inside the rotating guide sleeve. The auxiliary positioning component can position the outer periphery of the cylindrical bar close to the turning tool and the positioning position does not change, thereby preventing the problem of reduced turning thread accuracy caused by the positioning position of the outer periphery of the cylindrical bar being too far away from the turning tool or being separated from the auxiliary positioning component. It can adapt to the positioning of cylindrical bars with different diameters, and at the same time, when processing longer threads, the cylindrical bar does not need to be processed in sections, but can be directly processed to the required length, thereby greatly improving the processing efficiency of longer threads.

[0024] The present invention provides a roller rotatably arranged on the abutment block, and the roller can convert sliding friction into rolling friction, thereby reducing the friction force of the abutment block on the outer periphery of the cylindrical bar when the abutment block is in an inclined state. At the same time, the setting of the roller can reduce the wear on the processed surface of the cylindrical bar, further improving the accuracy of thread processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a high-strength bolt tapping device provided by one embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the spindle and the rotating guide sleeve of the high-strength bolt tapping device provided by an embodiment of the present invention;

[0027] Figure 3 For Figure 2 Top view of the spindle and the rotating guide sleeve of the high-strength bolt tapping device provided by an embodiment in

[0028] Figure 4 For Figure 3 Cross-sectional view of the spindle and the rotating guide sleeve of the high-strength bolt tapping device provided by an embodiment in

[0029] Figure 5 For Figure 4 Partial enlarged view of part X when the abutting block in the spindle and the rotating guide sleeve of the high-strength bolt tapping device provided by an embodiment in

[0030] Figure 6 For Figure 4 Partial enlarged view of part X when the abutting block in the spindle and the rotating guide sleeve of the high-strength bolt tapping device provided by an embodiment in

[0031] Figure 7 Sectional view of the spindle and the rotating guide sleeve of the high-strength bolt tapping device provided by an embodiment of the present invention;

[0032] Figure 8 For Figure 7 Partial enlarged view of part Y of the spindle and the rotating guide sleeve of the high-strength bolt tapping device provided by an embodiment in

[0033] Figure 9 Schematic diagram of the guide head of the high-strength bolt tapping device provided by an embodiment of the present invention;

[0034] Figure 10 For Figure 9 Sectional view of the guide head of the high-strength bolt tapping device provided by an embodiment in

[0035] Wherein:

[0036] 100, frame; 110, sliding frame; 120, spindle; 130, rotating guide sleeve; 140, first conical surface; 150, turning tool;

[0037] 200, guide head; 201, chute; 210, abutting block; 211, roller; 220, connecting rod; 230, sliding rod; 231, second conical surface; 240, elastic member; 250, connecting plate;

[0038] 300, Telescopic sleeve; 310, First sleeve; 311, Limiting groove; 320, Second sleeve; 321, Protrusion;

[0039] 400, Cylindrical bar stock. Detailed implementation manner

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 a limitation to the present invention.

[0042] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0043] Next, refer to Figures 1 - 10 to describe a high-strength bolt tapping device provided by the present invention.

[0044] A high-strength bolt tapping device, suitable for tapping bolts with a relatively long length, includes a frame 100. A core-passing mechanism is arranged on the frame 100. The core-passing mechanism includes a main shaft 120 and a rotating guide sleeve 130. One end of a cylindrical bar 400 can be clamped and rotated by the main shaft 120. The main shaft 120 drives the cylindrical bar 400 to rotate around its own axis. At the same time, a sliding frame 110 is also arranged on the frame 100. The main shaft 120 is located inside the sliding frame 110. The sliding frame 110 can drive the main shaft 120 to move axially along the axis of the main shaft 120, so that the main shaft 120 drives the cylindrical bar 400 to move axially. Since the main shaft 120 clamps one end of the cylindrical bar 400, it is necessary to use the rotating guide sleeve 130 to limit the other end of the cylindrical bar 400. The cylindrical bar 400 is coaxially arranged and passes through the inner circumference of the rotating guide sleeve 130. The rotating guide sleeve 130 is rotatably arranged on the frame 100, specifically connected to the frame 100 through a bearing (not shown in the figure). The main shaft 120 is coaxially connected to the rotating guide sleeve 130. The main shaft 120 can drive the rotating guide sleeve 130 to rotate synchronously, but the main shaft 120 cannot drive the rotating guide sleeve 130 to move axially.

[0045] A turning tool 150 is arranged on the frame 100. The position where the turning tool 150 is arranged is close to one end of the rotating guide sleeve 130. When the main shaft 120 drives the cylindrical bar 400 to rotate and axially extends out of the rotating guide sleeve 130, the turning tool 150 abuts against the outer circumference of the cylindrical bar 400, and then a thread can be turned on the outer circumference of the cylindrical bar 400. Generally, the bolt tapping devices in the prior art can only process bolts with a relatively short length. When processing longer bolts, since a part of the outer circumference of the cylindrical bar 400 that needs to be turned into a thread will be turned first, the diameter of this part will decrease, resulting in a gap between the original rotating guide sleeve 130 that can play a positioning role and the cylindrical bar 400 with a threaded part, so that the rotating guide sleeve 130 can no longer play a positioning role. Therefore, when overcoming this problem in the prior art, a method of clamping the cylindrical bar 400 in segments is adopted to Figure 5 As shown, in the prior art, after turning the outer circumference of the rightmost cylindrical bar 400 into a thread first, the main shaft 120 first extends the cylindrical bar 400 to the right so that the rotating guide sleeve 130 positions the outer circumference of the unturned cylindrical bar 400, and then the above operation is repeated until the required length of the thread is turned and then stopped. Therefore, when processing longer bolts in the prior art, the efficiency is greatly reduced. When the positioning length of the rotating guide sleeve 130 is set too long, the distance between the turning position and the positioning position of the cylindrical bar 400 is too large, which easily causes the cylindrical bar 400 to be subjected to a large eccentric force during turning, thereby reducing the precision of turning the thread.

[0046] The present invention is provided with an auxiliary positioning component inside the rotating guide sleeve 130. The auxiliary positioning component can position the outer periphery of the cylindrical bar 400 close to the turning tool 150 and the positioning position does not change, thereby preventing the problem of reduced turning thread accuracy caused by the outer periphery of the cylindrical bar 400 being positioned too far away from the turning tool 150 or being separated from the auxiliary positioning component. At the same time, the cylindrical bar 400 does not need to be processed in sections when processing longer threads, but can be directly processed to the required length, greatly improving the processing efficiency of longer threads.

[0047] Specifically, the auxiliary positioning assembly of the present invention includes a guide head 200 and a plurality of abutment blocks 210. The guide head 200 is slidably arranged on the inner periphery of the rotating guide sleeve 130 and can slide axially along the inner periphery of the rotating guide sleeve 130. The interior of the guide head 200 is hollow, and the cylindrical bar 400 passes through the guide head 200. The plurality of abutment blocks 210 are slidably arranged on the side wall of the guide head 200. The plurality of abutment blocks 210 can slide along the radial direction of the guide head 200 so that the abutment blocks 210 can abut against the outer periphery of the cylindrical bar 400. A connecting rod 220 is hinged on the abutment block 210, and the other end of the connecting rod 220 is slidably hinged on the inner peripheral wall of the guide head 200, as shown in FIG. Figure 5 As shown, the hinge position of the connecting rod 220 and the abutment block 210 is on the left side of the abutment block 210. When the abutment block 210 passes through positions with different diameters on the outer circumference of the cylindrical bar 400, that is, the transition zone between the unprocessed thread and the processed thread on the surface of the cylindrical bar 400, the transition zone of the cylindrical bar 400 will push the connecting rod 220, causing the connecting rod 220 to move radially outward along the guide head 200, and the connecting rod 220 drives the abutment block 210 to move. The state of the abutment block 210 has a first state and a second state.

[0048] When in the first state, the abutment block 210 abuts parallel to the unmachined surface or the surface of the machined thread of the cylindrical bar 400. When in the second state, the abutment block 210 abuts obliquely against the unmachined surface and the machined surface of the cylindrical bar 400, that is, abuts against the transition zone. Since the diameter of the machined surface is smaller than the diameter of the unmachined surface, the abutment block 210 is in an inclined state, but the abutment block 210 can still abut against the outer periphery of the cylindrical bar 400 to play a positioning role, which means that the outer periphery of the cylindrical bar 400 does not need to be segmented to position when processing longer threads, thereby improving processing efficiency.

[0049] It should be noted that the diameter of the processed surface of the cylindrical bar 400 is smaller than the diameter of the unprocessed surface. This is because one end of the bolt has a hexagonal head, so the hexagonal head structure needs to be reserved when processing the bolt, which makes the diameter of the processed surface smaller than the diameter of the unprocessed surface.

[0050] More specifically, through the following structure, the abutting block 210 can always abut against the outer periphery of the cylindrical bar 400. That is, the auxiliary positioning assembly further includes a sliding rod 230 and an elastic member 240. The sliding rod 230 is slidably disposed through the side wall of the guiding head 200 and is radially distributed along the side wall of the guiding head 200. For the convenience of arranging the sliding rod 230, as Figure 8 shown, a plurality of square holes extending radially along the side wall of the guiding head 200 are formed on the side wall of the guiding head 200. The cross-section of the sliding rod 230 is also square. The sliding rod 230 is slidably disposed in the square hole. One end of the sliding rod 230 is located inside the guiding head 200 and is hinged to the middle of the abutting block 210. The other end of the sliding rod 230 is slidably abutted against the inner periphery of the rotating guide sleeve 130. The inner periphery of the rotating guide sleeve 130 has a first tapered surface 140. As Figure 5 shown, the small end of the first tapered surface 140 faces outward and the large end faces inward. And a second tapered surface 231 is provided on one end of the sliding rod 230 that is slidably abutted against the inner periphery of the guiding head 200. The second tapered surface 231 is adapted to the first tapered surface 140. When the abutting block 210 is subjected to a radial force, it will push the connecting rod 220 to axially translate in the rotating guide sleeve 130. Since the connecting rod 220 is provided on the side wall of the guiding head 200, the guiding head 200 can be driven to move along its own axis. The elastic member 240 is disposed between the guiding head 200 and the rotating guide sleeve 130. As Figure 4 and Figure 5 shown, one end of the elastic member 240 is fixed on the rotating guide sleeve 130, and the other end of the elastic member 240 is connected to the guiding head 200. The elastic member 240 is in a compressed state, so that the guiding head 200 has a tendency to move to the right, which also enables the sliding rod 230 to push the abutting block 210 to abut against the outer periphery of the cylindrical bar 400, thereby positioning the cylindrical bar 400.

[0051] When the main shaft 120 drives the cylindrical bar 400 to move axially and the transition area on the cylindrical bar 400 passes through the abutting block 210, the abutting block 210 at this time will switch from a parallel state to an inclined state through the connecting rod 220, such as Figure 6 the state change to Figure 5 shown state change. At this time, the guiding head 200 will be pushed to move to the left. Specifically, after the abutting block 210 changes from a parallel state to an inclined state, the sliding rod 230 hinged to the middle of the abutting block 210 slides from right to left on the first tapered surface 140 of the inner periphery of the rotating guide sleeve 130, thereby driving the guiding head 200 to move to the left. At this time, the elastic member 240 is still compressed, and the elastic force of the elastic member 240 enables the abutting block 210 in the inclined state to still play a positioning role to prevent the cylindrical bar 400 from disengaging from the positioning of the abutting block 210.

[0052] Specifically, for the convenience of installing the guiding head 200 and the elastic member 240, a connecting plate 250 is detachably installed at one end of the guiding head 200 close to the elastic member 240, specifically detachably connected by screws. The other end of the connecting plate 250 is abutted by the elastic member 240.

[0053] It should be noted that the elastic member 240 in the embodiment of the present invention is a compression spring, and the elastic coefficient of the compression spring is related to the processed thread size. When the processed size of the thread is larger, a larger turning force of the turning tool 150 on the cylindrical bar 400 is required, that is, a larger abutting force of the abutting block 210 is required to avoid the failure of the positioning function of the abutting block 210. Therefore, an elastic member 240 with a larger elastic coefficient is required. Similarly, when the processed size of the thread is smaller, a larger abutting force is not required, so the elastic member 240 with a smaller elastic coefficient can be replaced.

[0054] In a further embodiment, a roller 211 is rotatably connected to one end of the abutting block 210 of the present invention away from the hinge with the connecting rod 220, and the axis of the roller 211 is perpendicular to the axis of the cylindrical bar 400. When the abutting block 210 abuts on the cylindrical bar 400, the roller 211 can rollingly contact the outer periphery of the cylindrical bar 400, as Figure 6 shown. When the abutting block 210 is in an inclined state, the roller 211 can tightly abut on the outer periphery of the cylindrical bar 400. And since the cylindrical bar 400 needs to axially move relative to the guiding head 200, the roller 211 is provided to convert sliding friction into rolling friction, reduce the friction force of the abutting block 210 on the outer periphery of the cylindrical bar 400 when in an inclined state. At the same time, the setting of the roller 211 can reduce the wear of the processed surface of the cylindrical bar 400 and improve the precision of thread processing.

[0055] Specifically, to enable the connecting rod 220 to slide in the guiding head 200, a plurality of sliding grooves 201 are opened on the side wall of the guiding head 200. The plurality of sliding grooves 201 are circumferentially arranged on the inner circumference of the guiding head 200, and the sliding grooves 201 extend along the axial direction of the guiding head 200, as Figure 5 、 Figure 9 and Figure 10 shown. One end of the connecting rod 220 is hinged with a slider, and the slider is slidably arranged in the sliding groove 201, so that one end of the connecting rod 220 is slidably hinged in the guiding head 200. When the transition area on the outer periphery of the cylindrical bar 400 passes through the connecting rod 220, the transition area position of the cylindrical bar 400 abuts the inner side of the connecting rod 220. And since one end of the connecting rod 220 is slidably hinged in the guiding head 200, the connecting rod 220 can drive the abutting block 210 to move radially outward along the guiding head 200, that is, drive the sliding rod 230 to move outward, as Figure 6As shown, it is set that the cylindrical bar 400 moves from left to right. At different diameter positions on the cylindrical bar 400, that is, the transition zone will abut against the connecting rod 220. Since the connecting rod 220 is in an inclined state, as the cylindrical bar 400 moves from left to right, the connecting rod 220 will be pushed by the cylindrical bar 400 to drive the abutting block 210 to be in an inclined state. When the abutting block 210 is in an inclined state, it can still tightly abut against the outer circumference of the cylindrical bar 400 to play a positioning role.

[0056] More specifically, to achieve the function that the main shaft 120 can rotate synchronously with the rotating guide sleeve 130 but the main shaft 120 and the rotating guide sleeve 130 can move relative to each other axially, a telescopic sleeve 300 is provided between the main shaft 120 and the rotating guide sleeve 130. The telescopic sleeve 300 includes a first sleeve 310 and a second sleeve 320. The first sleeve 310 and the second sleeve 320 are sleeved with each other. A limiting groove 311 is formed on the side wall of the first sleeve 310 and is distributed along its axial direction. And a convex block 321 is fixedly arranged on the outer circumference of the second sleeve 320. The convex block 321 is located in the limiting groove 311. The convex block 321 can slide along the limiting groove 311 in the limiting groove 311. Through the arrangement of the convex block 321 and the limiting groove 311, the first sleeve 310 and the second sleeve 320 can move relative to each other axially but the two cannot rotate relative to each other. One end of the first sleeve 310 far from the connection with the second sleeve 320 is slidably connected to the main shaft 120, and the connection method is the same as the connection method between the first sleeve 310 and the second sleeve 320, so that the main shaft 120 can axially slide relative to the first sleeve 310, which can increase the distance that the main shaft 120 drives the cylindrical bar 400 to move axially. And one end of the second sleeve 320 far from the connection with the first sleeve 310 is fixed on the rotating guide sleeve 130. When the main shaft 120 rotates, it can drive the rotating guide sleeve 130 to rotate synchronously through the first sleeve 310 and the second sleeve 320. When the main shaft 120 moves axially, since the rotating guide sleeve 130 is rotatably connected to the frame 100 and the rotating guide sleeve 130 cannot move, when the main shaft 120 moves axially, the first sleeve 310 and the second sleeve 320 can be telescopic, so as to adapt to the processing steps of the cylindrical bar 400.

[0057] It should be noted that the structure capable of realizing the telescopic connection between the main shaft 120 and the rotating guide sleeve 130 is not limited to the structure of the telescopic sleeve 300 described above. For example, a plurality of telescopic rods are used to connect the main shaft 120 and the rotating guide sleeve 130. One ends of the plurality of telescopic rods are circumferentially and uniformly distributed on the main shaft 120 and are fixedly connected. The axes of the plurality of telescopic rods are parallel to the axis of the main shaft 120. The other ends of the plurality of telescopic rods are fixedly connected to the rotating guide sleeve 130 and are also circumferentially and uniformly distributed and fixedly connected at the same time, so that the main shaft 120 and the rotating guide sleeve 130 can rotate synchronously and have the function of telescoping. Of course, other telescopic structures are also possible and are not specifically limited here.

[0058] In a further embodiment, a driving assembly is provided on the frame 100. The driving assembly can drive the main shaft 120 to rotate around its own axis and can move along the axial direction of the main shaft 120.

[0059] Specifically, the driving assembly includes a first driving motor (not shown in the figure) and a second driving motor (not shown in the figure). The first driving motor is fixedly arranged in the sliding frame 110. The rotating shaft of the first driving motor is engaged with the main shaft 120. When the first driving motor rotates, it can drive the main shaft 120 to rotate around its own axis. The second driving motor is fixedly arranged on the frame 100. A slide rail (not shown in the figure) is provided at the sliding connection between the frame 100 and the sliding frame 110. The slide rail extends along the axial direction of the main shaft 120. A rack (not shown in the figure) is arranged in the slide rail. The rotating shaft of the second driving motor is engaged with the rack. Therefore, when the second driving motor rotates, it can drive the sliding frame 110 to move through the engagement of the rotating shaft and the rack, and the main shaft 120 on the sliding frame 110 moves along its axial direction.

[0060] It should be noted that the driving assembly is not limited to the above structure and can also be other driving elements, which are not specifically limited here.

[0061] Combined with the above embodiments, the specific working process of a high-strength bolt tapping device provided by the present invention is described as follows:

[0062] Clamp the cylindrical rod 400 to be threaded on the main shaft 120, as Figure 4 and Figure 5As shown, the cylindrical bar stock 400 passes through the first sleeve 310, the second sleeve 320, the guiding head 200, and the rotating guide sleeve 130 and extends a certain distance, and approaches the turning tool 150. At this time, the elastic member 240 is in a compressed state. The elastic member 240 pushes the guiding head 200 to have a tendency to move to the right. The guiding head 200 pushes the sliding rod 230 to move on the first tapered surface 140 on the inner circumference of the rotating guide sleeve 130. Under the action of the first tapered surface 140, the sliding rod 230 moves in the direction close to the cylindrical bar stock 400 and then pushes the abutting block 210 to abut against the outer circumference of the cylindrical bar stock 400. The number of the abutting blocks 210 is multiple and they are circumferentially arrayed on the outer circumference of the cylindrical bar stock 400, so as to be able to position the cylindrical bar stock 400 and prevent the cylindrical bar stock 400 from shifting. <00001

[0063] After adjusting the angle of the turning tool 150 and the rotation speeds of the first driving motor and the second driving motor, the machining of the thread on the surface of the cylindrical bar stock 400 begins. First, the area on the cylindrical bar stock 400 that needs to be machined with the thread is machined as a whole, and the diameter of this area is machined to be smaller than the area of the part that does not need to be machined with the thread, so as to make a reserved area for machining the hexagonal head of the bolt.

[0064] After the turning is completed, the thread machining of the area with a smaller diameter begins. As the cylindrical bar stock 400 rotates and axially moves, the thread is gradually machined on the surface of the cylindrical bar stock 400. Since the required thread cannot be machined in one go during the machining process but needs to be machined layer by layer, it is similar to when grinding and turning shaft parts, the bar stock needs to be turned layer by layer to reach the required size. Therefore, after the main shaft 120 moves the cylindrical bar stock 400 from the left end to the right end, it needs to return from the right end to the left end to perform multiple turnings to gradually machine the required thread. During the reciprocating movement of the cylindrical bar stock 400, different diameter areas on the outer circumference of the cylindrical bar stock 400 will pass through the inclined connecting rod 220, that is, the transition area between the machined thread and the non-machined thread on the outer circumference of the cylindrical bar stock 400 will pass through the connecting rod 220. Under the action of the connecting rod 220, the abutting block 210 can smoothly pass through the transition area on the outer circumference of the cylindrical bar stock 400, and the abutting block

[0065] During the transition area moving from the position of the connecting rod 220 to the position of the abutting block 210, the connecting rod 220 will be extruded by the transition area and move in a direction away from the transition area. The connecting rod 220 drives one end of the abutting block 210 to move synchronously. Since the middle position of the abutting block 210 is hinged to the sliding rod 230, the abutting block 210 deflects around the middle hinge position, making the abutting block 210 in an inclined state. The abutting block 210 will press against the sliding rod 230, causing the sliding rod 230 to slide on the first tapered surface 140. The sliding rod 230 drives the guiding head 200 to move to the left, thereby compressing the elastic member 240. The reaction of the elastic member 240 makes the abutting block 210 tightly abut against the outer circumference of the cylindrical bar stock 400. At the same time, the roller 211 rotatably connected to the other end of the abutting block 210 rolls on the surface of the cylindrical bar stock 400 where the thread is processed, thereby reducing the frictional force on the axial movement of the cylindrical bar stock 400. Subsequently, the abutting block 210 gradually returns to the state as shown in Figure 5 . When the transition area of the cylindrical bar stock 400 passes through the abutting block 210, it can play a role in positioning the cylindrical bar stock 400 throughout the process, thereby improving the positioning accuracy of the cylindrical bar stock 400, and further improving the accuracy of thread processing.

[0066] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0067] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A high-strength bolt tapping device, characterized in that Comprising: A frame, on which a main shaft and a rotating guide sleeve are provided. The main shaft can clamp a cylindrical bar and rotate around its own axis and move axially along the cylindrical bar. The rotating guide sleeve is rotatably arranged on the frame. The cylindrical bar is coaxially arranged and passes through the inner circumference of the rotating guide sleeve. The main shaft is coaxially and telescopically connected to the rotating guide sleeve, and the main shaft drives the rotating guide sleeve to rotate synchronously; A driving assembly, which can drive the main shaft to rotate around its own axis and can drive the main shaft to move axially along it; A turning tool, which is arranged on the frame and near one end of the rotating guide sleeve. The turning tool can turn a thread on the outer circumference of the cylindrical bar; An auxiliary positioning assembly, which includes a guiding head, a plurality of abutting blocks, a sliding rod and an elastic member. The guiding head is slidably arranged on the inner circumference of the rotating guide sleeve and can slide axially along the inner circumference of the rotating guide sleeve. The plurality of abutting blocks are slidably arranged on the side wall of the guiding head and can move radially along the guiding head. The plurality of abutting blocks can abut against the outer circumference of the cylindrical bar. The sliding rod is slidably inserted through the side wall of the guiding head and is distributed radially along the side wall of the guiding head. One end of the sliding rod is hinged in the middle of the abutting block, and the other end of the sliding rod is slidably abutted against the inner circumference of the rotating guide sleeve. The inner circumference of the rotating guide sleeve has a first conical surface, and the end of the sliding rod abutted against the inner circumference of the rotating guide sleeve has a second conical surface, and the first conical surface and the second conical surface are adapted to each other. One end of the elastic member is connected to the guiding head, and the other end of the elastic member is connected to the rotating guide sleeve. The elastic member can push the guiding head to move axially along the rotating guide sleeve; A connecting rod, one end of which is hinged to the abutting block, and the other end of the connecting rod is hinged to the inner circumference of the guiding head, and the end of the connecting rod hinged to the inner circumference of the guiding head can slide axially along the guiding head. During the axial movement of the cylindrical bar, different diameters of the outer circumference of the cylindrical bar abut against the connecting rod; When the abutting block is in a horizontal state, the abutting block abuts against the outer circumference of the cylindrical bar or the outer circumference of the processed thread; When the abutting block is in an inclined state, the abutting block abuts against both the outer circumference of the cylindrical bar and the outer circumference of the processed thread at the same time.

2. The high-strength bolt tapping device according to claim 1, wherein A connecting plate is detachably arranged between the elastic member and the guiding head.

3. The high-strength bolt tapping device according to claim 1, wherein The elastic member is a compression spring.

4. The high-strength bolt tapping device according to claim 1, characterized in that, A roller is rotatably arranged at one end of the abutting block away from the connecting rod, and the axis of the roller is perpendicular to the axis of the cylindrical bar. The roller is in rolling contact with the outer circumference of the cylindrical bar or the outer circumference of the processed thread.

5. The high-strength bolt tapping device according to claim 1, characterized in that, A plurality of chutes are formed on the inner side wall of the guiding head. The plurality of chutes are arranged in a circumferential array on the inner circumference of the guiding head and extend axially along the guiding head. One end of the connecting rod is hinged with a slider, and the slider is slidably arranged in the chute.

6. The high-strength bolt tapping device according to claim 1, characterized in that, A telescopic sleeve is provided between the main shaft and the rotating guide sleeve. The telescopic sleeve can telescopically move along the axial direction of the main shaft. One end of the telescopic sleeve is connected to the rotating guide sleeve, and the other end of the telescopic sleeve is connected to the main shaft.

7. The high-strength bolt tapping device according to claim 6, characterized in that, The telescopic sleeve includes a first sleeve and a second sleeve. The first sleeve and the second sleeve are sleeved with each other. A limiting groove distributed along its axial direction is formed on the side wall of the first sleeve. A convex block is arranged on the outer periphery of the second sleeve, and the convex block is located in the limiting groove. The ends of the first sleeve and the second sleeve away from each other are respectively connected to the main shaft and the rotating guide sleeve.

8. The tapping device for high-strength bolts according to claim 1, characterized in that, The driving assembly includes a first driving motor and a second driving motor. The rotating shaft of the first driving motor is engaged with the main shaft. When the first driving motor rotates, the main shaft is driven to rotate. A sliding frame is arranged on the frame, and the sliding frame can move along the axial direction of the main shaft on the frame. The second driving motor can drive the sliding frame to move.

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