Advancing and retracting tool structure and control method of a full-automatic beveling machine

Abstract

The present invention discloses a feed-in and feed-out structure of a full-automatic beveling machine, which includes a main machine housing, a driving device, a first transmission assembly, a feed nut, a feed gear assembly, and a tool shaft; the tool shaft includes a main body rod and a threaded rod, the feed nut is sleeved on the threaded rod through a thread, and the feed gear assembly is sleeved on the outer side of the feed nut; a positioning sleeve is fixedly sleeved on the upper end of the threaded rod, and a retaining sleeve is sleeved on the lower end of the threaded rod; the tool shaft includes a positioning rod fixedly connected to the upper end of the threaded rod, the positioning rod is fixedly connected with an axial ring, an annular groove is provided on the outer peripheral side of the axial ring, and the main machine housing is provided with an elastic clamping member that is clamped and matched with the annular groove; by setting the elastic clamping member in the present invention, after the tool shaft retracts to the in-place position, the elastic clamping member is snapped into the annular groove, so that a gap is formed between the upper end surface of the feed nut and the upper end cover, avoiding contact wear between the feed nut and the upper end cover during idling, and reducing noise.

Description

Technical Field

[0001] The present invention relates to the technical field of beveling machines, and particularly relates to a feed and retraction structure and control method for a full-automatic beveling machine. Background Art

[0002] A beveling machine is a special tool for chamfering the front end face of a pipeline or a flat plate, which solves the disadvantages of non-standard angles, rough slopes, and high working noise in operation processes such as flame cutting and grinding by a grinding machine, and has the advantages of simple operation, standard angles, and smooth surfaces; most of the current beveling machines adopt a manual feed and retraction method, with low efficiency, high labor intensity, and low precision. There are also a small number of beveling machines that adopt an automatic feed and retraction method, but all have certain defects.

[0003] For example, the invention patent with the publication number CN204800348U was published on November 25, 2015, and discloses a new type of two-way limit automatic beveling machine, which relates to a pipeline beveling machine and includes a feed gearbox, a main gearbox, and a cutter. Among them, a two-way limit device is provided in the feed gearbox. The upper end cover, the feed gear, and the lower end cover of the feed gear in it are connected by screws. The feed nut is concentrically matched with the feed gear. Two mounting holes are symmetrically arranged on the upper surface and the lower surface of the feed nut. Springs and detent pins are fixedly arranged in the mounting holes. Stoppers adapted to the detent pins are arranged on the lower surface of the upper end cover of the feed gear and the upper surface of the lower end cover of the feed gear. A limit piece is arranged at the upper end of the main shaft. A retaining sleeve is arranged in the lower end cover of the feed gear, and the lower end of the retaining sleeve is matched with the shoulder of the main shaft.

[0004] In the above solution, at the end of the feed and retraction stroke, a two-way limit device is provided to eliminate the phenomenon of the cutting block being cut and the main shaft burning out when the machine tool malfunctions. However, after the feed and retraction are completed, there is contact friction between the feed nut and the feed gear, which has a certain noise and is prone to wear after long-term use. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art, and provide a feed and retraction structure and control method for a full-automatic beveling machine. An elastic clamping member is provided. After the cutter shaft retracts to the in-place position, the elastic clamping member is clamped into the annular slot to finely adjust the position of the feed nut, so that a gap is formed between the upper end surface of the feed nut and the upper end cover, avoiding contact wear between the feed nut and the upper end cover during idling and reducing noise.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A feed and retraction structure for a full-automatic beveling machine includes a main machine housing, a driving device, a first transmission assembly, and a cutter shaft. The cutter shaft is rotatably connected to the main machine housing through a bearing, and the driving device is connected to the first transmission assembly to drive the cutter shaft to rotate;

[0008] The tool shaft includes a main body rod and a threaded rod fixedly connected to the upper end of the main body rod. The diameter of the threaded rod is smaller than that of the main body rod, and there is a shoulder between the threaded rod and the main body rod;

[0009] It includes a feed nut. The feed nut is sleeved on the threaded rod through a thread. An upper blind groove is provided on the upper end face of the feed nut. An upper pin shaft is slidably arranged in the upper blind groove, and a first spring is arranged between the upper pin shaft and the bottom of the upper blind groove; A lower blind groove is provided on the lower end face of the feed nut. A lower pin shaft is slidably arranged in the lower blind groove, and a second spring is arranged between the lower pin shaft and the bottom of the lower blind groove;

[0010] It includes a feed gear assembly. The driving device is connected to a second transmission assembly to drive the feed gear assembly to rotate. The feed gear assembly is sleeved outside the feed nut. The outside of the feed gear assembly is rotatably connected to the main machine housing through a bearing, and there is a space gap between the inside of the feed gear assembly and the feed nut;

[0011] The feed gear assembly includes a main gear ring, an upper end cover fixedly connected to the upper end face of the main gear ring, and a lower end cover fixedly connected to the lower end face of the main gear ring. A first arc platform coaxial with it is provided on the bottom surface of the upper end cover. One end of the first arc platform is provided with a slope wall for the upper pin shaft to slide through, and the other end is provided with a stop wall for blocking the upper pin shaft from passing through; A second arc platform coaxial with it is provided on the top surface of the lower end cover. One end of the second arc platform is provided with a slope wall for the lower pin shaft to slide through, and the other end is provided with a stop wall for blocking the lower pin shaft from passing through; The position of the slope wall of the first arc platform relative to the stop wall is opposite to the position of the slope wall of the second arc platform relative to the stop wall;

[0012] A positioning sleeve is fixedly sleeved on the upper end of the threaded rod. The positioning sleeve is used to pass through the inner hole of the upper end cover to press the upper pin shaft back into the upper blind groove; A retaining sleeve is sleeved on the lower end of the threaded rod. The bottom of the retaining sleeve abuts against the shoulder. The retaining sleeve is used to pass through the inner hole of the lower end cover to press the lower pin shaft back into the upper blind groove;

[0013] The tool shaft includes a positioning rod fixedly connected to the upper end of the threaded rod. The positioning rod is fixedly connected with a shaft ring. An annular clamping groove is provided on the outer peripheral side of the shaft ring. The main machine housing is provided with an elastic clamping member that is clamped and matched with the annular clamping groove.

[0014] An inner groove is provided on the inner wall of the main machine housing at the position of the annular clamping groove. The elastic clamping member includes a spring arranged in the inner groove and a ball block connected to the spring.

[0015] The cross section of the annular clamping groove is triangular.

[0016] The upper end cover, the main gear ring and the lower end cover are connected through bolts penetrating them.

[0017] On the bottom surface of the upper end cover, a plurality of the first arc-shaped platforms coaxial with it are evenly spaced; on the top surface of the lower end cover, a plurality of the second arc-shaped platforms coaxial with it are evenly spaced.

[0018] On the upper end surface of the feed nut, a plurality of the upper blind grooves are evenly spaced. Each upper blind groove is slidably provided with an upper pin shaft. Between each upper pin shaft and the bottom of the corresponding upper blind groove, a first spring is provided; the plurality of upper pin shafts correspond one by one to the plurality of the first arc-shaped platforms;

[0019] On the lower end surface of the feed nut, a plurality of the lower blind grooves are evenly spaced. Each lower blind groove is slidably provided with a lower pin shaft. Between each lower pin shaft and the bottom of the corresponding lower blind groove, a second spring is provided; the plurality of lower pin shafts correspond one by one to the plurality of the second arc-shaped platforms.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] An elastic clamping member is provided. When the tool axially retracts, the upper end surface of the feed nut is actually in a contact friction state with the upper end cover. After the tool axially retracts to the position, the elastic clamping member snaps into the annular card slot to finely adjust the position of the feed nut, so that a gap is formed between the upper end surface of the feed nut and the upper end cover, and a gap is formed between the lower end surface and the lower end cover, avoiding contact wear between the lower end surface of the feed nut and the lower end cover under the action of gravity during idling, and reducing noise;

[0022] For the entire automatic feed and retract process, only the disconnection and connection of the driving device and the second transmission component need to be controlled, without the need for additional manual control or program setting of the feed and retract distances, realizing automatic feed and retract, with simple and convenient control, and optimizing the process steps;

[0023] By pressing the upper pin shaft back into the upper blind groove through the positioning sleeve, the lower limit of the tool shaft is carried out, and by pressing the lower pin shaft back into the lower blind groove through the retaining sleeve, the upper limit of the tool shaft is carried out, that is, the upper and lower limits of the tool shaft are realized in a hardware manner, increasing safety. During the process of the tool shaft feeding and retracting, the tool shaft can always be in a rotating state, preparing for preheating for the next processing, without the need to repeatedly drive the tool shaft, reducing the preheating time, and improving the efficiency of batch bevel processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the feed and retract structure of the full-automatic beveling machine of the present invention;

[0025] Figure 2 For the present inventionFigure 1 Partial enlarged view at A in the [specific context];

[0026] Figure 3 Cross-sectional view of the upper end cover of the present invention;

[0027] Figure 4 Bottom view of the upper end cover of the present invention;

[0028] Figure 5 Cross-sectional view of the lower end cover of the present invention;

[0029] Figure 6 Top view of the lower end cover of the present invention;

[0030] In the figure: 1, main machine housing; 2, first transmission assembly; 3, main body rod; 4, threaded rod; 5, feed nut; 6, first spring; 7, upper pin shaft; 8, lower pin shaft; 9, second spring; 10, feed gear assembly; 11, second transmission assembly; 12, main gear ring; 13, upper end cover; 14, lower end cover; 15, first arc platform; 16, second arc platform; 17, positioning sleeve; 18, retaining sleeve; 19, positioning rod; 20, shaft ring; 21, annular card slot; 22, third spring; 23, ball block. Detailed implementation manners

[0031] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "horizontal", "vertical", etc. are all based on the orientation or positional relationships shown in the accompanying drawings. It 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 should not be construed as a limitation of the present invention.

[0033] Such as Figure 1 and Figure 2As shown in the figure, a feed structure of a full-automatic beveling machine includes a main machine housing 1, a driving device, a first transmission component 2 and a tool shaft. The tool shaft is rotatably connected to the main machine housing 1 through bearings, and the driving device is connected to the first transmission component 2 to drive the tool shaft to rotate; the driving device can be a motor or a diesel engine. The first transmission component 2 is a design of the prior art. A common way of the first transmission component 2 is that the first transmission component 2 is a gear, which is transversely matched with the gear of the tool shaft, so as to realize both driving the tool shaft to rotate and not affecting the up and down displacement of the tool shaft.

[0034] The tool axis includes a main body rod 3 and a threaded rod 4 fixedly connected to the upper end of the main body rod 3. The diameter of the threaded rod 4 is smaller than that of the main body rod 3, and there is a shoulder between the threaded rod 4 and the main body rod 3. It includes a feed nut. The feed nut 5 is threadedly sleeved on the threaded rod 4. An upper blind groove is provided on the upper end face of the feed nut 5. An upper pin shaft 7 is slidably arranged in the upper blind groove. A first spring 6 is arranged between the upper pin shaft 7 and the bottom of the upper blind groove. A lower blind groove is provided on the lower end face of the feed nut 5. A lower pin shaft 8 is slidably arranged in the lower blind groove. A second spring 9 is arranged between the lower pin shaft 8 and the bottom of the lower blind groove. It includes a feed gear assembly 10. The driving device is connected to a second transmission assembly 11 to drive the feed gear assembly 10 to rotate. The feed gear assembly 10 is sleeved on the outside of the feed nut 5. The outside of the feed gear assembly 10 is rotatably connected to the main machine housing 1 through a bearing, and there is a space gap between the inner side of the feed gear assembly 10 and the feed nut 5. The feed gear assembly 10 includes a main gear ring 12, an upper end cover 13 fixedly connected to the upper end face of the main gear ring 12, and a lower end cover 14 fixedly connected to the lower end face of the main gear ring 12. A first arc platform 15 coaxial with it is provided on the bottom surface of the upper end cover 13. One end of the first arc platform 15 is provided with a slope wall for the upper pin shaft 7 to slide through, and the other end is provided with a stop wall for blocking the upper pin shaft 7 from passing through. A second arc platform 16 coaxial with it is provided on the top surface of the lower end cover 14. One end of the second arc platform 16 is provided with a slope wall for the lower pin shaft to slide through, and the other end is provided with a stop wall for blocking the lower pin shaft 8 from passing through. The position of the slope wall of the first arc platform 15 relative to the stop wall is opposite to the position of the slope wall of the second arc platform 16 relative to the stop wall. An annular positioning sleeve 17 is fixedly arranged at the upper end of the threaded rod 4. The positioning sleeve 17 is used to pass through the inner hole of the upper end cover 13 to press the upper pin shaft 7 back into the upper blind groove. A retaining sleeve 18 is sleeved on the lower end of the threaded rod 4. The bottom of the retaining sleeve 18 abuts against the shoulder. The retaining sleeve 18 is used to pass through the inner hole of the lower end cover to press the lower pin shaft 8 back into the lower blind groove. A part of the orthographic projection of the upper pin shaft 7 on the upper end cover 13 falls within the contour circle range of the inner hole of the upper end cover 13, so that after the positioning sleeve 17 passes through the inner hole of the upper end cover 13, it can contact the upper pin shaft 7 and press the upper pin shaft 7 back into the upper blind groove. A part of the orthographic projection of the lower pin shaft 8 on the lower end cover 14 falls within the contour circle range of the inner hole of the lower end cover 14, so that after the retaining sleeve 18 passes through the inner hole of the lower end cover 14, it can contact the lower pin shaft 8 and press the lower pin shaft 8 back into the upper blind groove.

[0035] When automatic feed is required, the control drive device is connected to the second transmission component 11, so that the rotational speed of the feed gear assembly 10 is greater than that of the tool shaft to form a positive slip, and the feed gear assembly 10 drives the feed nut 5 to rotate clockwise relative to the tool shaft, so that the tool shaft extends downward until the positioning sleeve 17 presses the upper pin shaft 7 back into the upper blind groove. After the tool shaft descends a predetermined distance, it no longer descends, realizing automatic feed; when automatic retraction is required, the drive device is disconnected from the second transmission component 11, and the feed gear assembly 10 is clamped and stationary. The feed gear assembly 10 rotates counterclockwise relative to the tool shaft, and the retaining wall of the second arc-shaped platform 16 abuts against the lower pin shaft 8, causing the feed nut 5 to also stop with the feed gear assembly 10, making the feed nut 5 rotate counterclockwise relative to the tool shaft, causing the tool shaft to retract upward until the retaining sleeve 18 presses the lower pin shaft 8 back into the lower blind groove, and the tool shaft no longer retracts upward, realizing automatic retraction.

[0036] Among them, the second transmission component 11 is a conventional design. For example, the second transmission component 11 is a gear that meshes with the outer teeth of the main gear ring 12. The first transmission component 2 and the second transmission component 11 are in an existing clutch connection mode, and the disconnection and connection of the first transmission component 2 and the second transmission component 11 are controlled by a handle, so as to control the transmission of the power of the drive device to the feed gear assembly.

[0037] The entire automatic feed and retraction process only needs to control the disconnection and connection of the drive device and the second transmission component 11, without the need for additional manual control or program setting of the feed and retraction distances, realizing automatic feed and retraction, which is simple and convenient and optimizes the process steps.

[0038] The upper pin shaft 7 is pressed back into the upper blind groove by the positioning sleeve 17 to limit the downward movement of the tool shaft, and the lower pin shaft 8 is pressed back into the lower blind groove by the retaining sleeve 18 to limit the upward movement of the tool shaft, that is, the upper and lower limits of the tool shaft are realized in a hardware manner, increasing safety. During the process of the tool shaft feeding and retracting, the tool shaft can always be in a rotating state, preparing for preheating for the next processing, without the need to repeatedly drive the tool shaft, reducing the preheating time and improving the efficiency of batch bevel processing.

[0039] The tool shaft includes a positioning rod 19 fixedly connected to the upper end of the threaded rod 4. The positioning rod 19 is fixedly connected with a shaft ring 20, and an annular card slot 21 is arranged on the outer peripheral side of the shaft ring 20. The main machine housing 1 is provided with an elastic card member that is clamped and matched with the annular card slot 21. The function of setting the elastic card member is that when the tool shaft retracts upward, the upper end surface of the feed nut 5 is actually in a contact friction state with the upper end cover 13. After the tool shaft retracts to the position, the elastic card member is clamped into the annular card slot 21 to finely adjust the position of the feed nut 5, so that a gap is formed between the upper end surface of the feed nut 5 and the upper end cover 13, and a gap is formed between the lower end surface and the lower end cover 13, avoiding contact wear between the lower end surface of the feed nut 5 and the lower end cover 13 under the action of gravity during idling and reducing noise.

[0040] An inner groove is provided on the inner wall of the annular card slot 21 of the main body housing 1. The elastic clamping member includes a third spring 22 provided in the inner groove and a ball block 23 connected to the third spring 22. The cross-section of the annular card slot 21 is triangular. By arranging the cooperation of the ball block 23 and the annular card slot 21 with a triangular cross-section, it is convenient for the ball block 23 to be inserted and detached, avoiding jamming and affecting the lifting of the tool shaft.

[0041] The upper end cover 13, the main gear ring 12 and the lower end cover 14 are connected through bolts passing through. This detachable connection method is convenient for separately processing the upper end cover 13, the main gear ring 12 and the lower end cover 14, reducing the processing difficulty and facilitating maintenance after damage.

[0042] A plurality of first arc platforms 15 coaxial with the upper end cover 13 are evenly spaced on the bottom surface of the upper end cover 13. A plurality of second arc platforms 16 coaxial with the lower end cover 14 are evenly spaced on the top surface of the lower end cover 14. A plurality of upper blind grooves are evenly spaced on the upper end surface of the feed nut 5. An upper pin shaft 7 is slidably arranged in each upper blind groove. A first spring 6 is arranged between the bottom of each upper pin shaft 7 and the bottom of the corresponding upper blind groove. A plurality of lower blind grooves are evenly spaced on the lower end surface of the feed nut 5. A lower pin shaft 8 is slidably arranged in each lower blind groove. A second spring 9 is arranged between the bottom of each lower pin shaft 8 and the bottom of the corresponding lower blind groove. By arranging the cooperation of a plurality of first arc platforms 15 and a plurality of upper pin shafts 7 one by one, and by arranging the cooperation of a plurality of second arc platforms 16 and a plurality of lower pin shafts 8 one by one, the contact stability is increased, avoiding the single pin shaft being damaged and unhooked, which affects the safety.

[0043] A control method for the feed and retraction structure of a full-automatic beveling machine includes the following specific steps:

[0044] S1. The tool shaft is in the retracted state to be processed. The driving device drives the tool shaft to rotate clockwise through the connection of the first transmission component 2. At this time, the upper pin shaft 7 extends out and contacts and slides along the slope wall of the first arc platform 15. The first arc platform 15 does not block the circumferential rotation movement of the upper pin shaft 7. The bottom of the retaining sleeve 18 abuts against the shoulder, and the top of the retaining sleeve 18 pushes the lower pin shaft 8 back into the lower blind groove, so that the second arc platform 16 also does not block the circumferential rotation movement of the lower pin shaft 8.

[0045] S2. The driving device drives the feed gear assembly 10 to rotate by connecting the second transmission assembly 11, so that the rotational speed of the feed gear assembly 10 is greater than that of the tool shaft to form a positive slip. The feed gear assembly 10 rotates clockwise relative to the tool shaft. The retaining wall of the first arc table 15 abuts against the upper pin shaft 7, causing the feed nut 5 to also rotate at the same speed as the feed gear assembly 10, so that the feed nut 5 rotates clockwise relative to the tool shaft. The feed nut 5 causes the tool shaft to extend downward through the thread until the positioning sleeve 17 presses the upper pin shaft 7 back into the upper blind groove, and the tool shaft no longer descends, realizing automatic feeding; at this time, although the top of the retaining sleeve 18 no longer abuts against the lower pin shaft, the lower pin shaft 8 contacts and slides along the slope wall of the second arc table 16, and the second arc table 16 does not block the rotation of the feed nut 5.

[0046] S3. The driving device is disconnected from the second transmission assembly 11, and the feed gear assembly 10 is clamped and stationary. The rotational speed of the feed gear assembly 10 is less than that of the tool shaft to form a reverse slip. The feed gear assembly 10 rotates counterclockwise relative to the tool shaft. The retaining wall of the second arc table 16 abuts against the lower pin shaft 8, causing the feed nut 5 to also be stationary with the feed gear assembly 10, so that the feed nut 5 rotates counterclockwise relative to the tool shaft. The feed nut 5 causes the tool shaft to retract upward through the thread until the retaining sleeve 18 presses the lower pin shaft 8 back into the lower blind groove, and the tool shaft no longer retracts upward, realizing automatic retraction; at this time, although the positioning sleeve 17 no longer presses the upper pin shaft 7, the upper pin shaft 7 contacts and slides along the slope wall of the first arc table 15, and the first arc table 15 does not block the rotation of the feed nut 5.

[0047] S4. When the tool shaft retracts upward to the in-place position, the elastic clip is inserted into the annular card slot 21 to finely adjust the position of the feed nut 5, so that a gap is formed between the upper end surface of the feed nut 5 and the upper end cover 13, and a gap is also formed between the lower end surface of the feed nut 5 and the lower end cover 14.

[0048] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The feeding and retracting structure of a full-automatic beveling machine, comprising a main machine housing (1), a driving device, a first transmission assembly (2) and a cutter shaft. The cutter shaft is rotatably connected to the main machine housing (1) through a bearing, and the driving device is connected to the first transmission assembly (2) to drive the cutter shaft to rotate; The cutter shaft includes a main body rod (3) and a threaded rod (4) fixedly connected to the upper end of the main body rod (3). The diameter of the threaded rod (4) is smaller than that of the main body rod (3), and there is a shoulder between the threaded rod (4) and the main body rod (3); It includes a feed nut (5). The feed nut (5) is sleeved on the threaded rod (4) through a thread. An upper blind groove is provided on the upper end face of the feed nut (5), and an upper pin shaft (7) is slidably arranged in the upper blind groove. A first spring (6) is arranged between the upper pin shaft (7) and the bottom of the upper blind groove; A lower blind groove is provided on the lower end face of the feed nut (5), and a lower pin shaft (8) is slidably arranged in the lower blind groove. A second spring (9) is arranged between the lower pin shaft (8) and the bottom of the lower blind groove; It includes a feed gear assembly (10). The driving device is connected to a second transmission assembly (11) to drive the feed gear assembly (10) to rotate. The feed gear assembly (10) is sleeved on the outside of the feed nut (5). The outside of the feed gear assembly (10) is rotatably connected to the main machine housing (1) through a bearing, and there is a space gap between the inside of the feed gear assembly (10) and the feed nut (5); The feed gear assembly (10) includes a main gear ring (12), an upper end cover (13) fixedly connected to the upper end face of the main gear ring (12) and a lower end cover (14) fixedly connected to the lower end face of the main gear ring (12). A first arc platform (15) coaxial with it is provided on the bottom surface of the upper end cover (13). One end of the first arc platform (15) is provided with a slope wall for the upper pin shaft (7) to slide through, and the other end is provided with a stop wall for blocking the upper pin shaft (7) from passing through; A second arc platform (16) coaxial with it is provided on the top surface of the lower end cover (14). One end of the second arc platform (16) is provided with a slope wall for the lower pin shaft (8) to slide through, and the other end is provided with a stop wall for blocking the lower pin shaft (8) from passing through; The position of the slope wall of the first arc platform (15) relative to the stop wall is opposite to the position of the slope wall of the second arc platform (16) relative to the stop wall; A positioning sleeve (17) is fixedly sleeved on the upper end of the threaded rod (4). The positioning sleeve (17) is used to pass through the inner hole of the upper end cover to press the upper pin shaft (7) back into the upper blind groove; A retaining sleeve (18) is sleeved on the lower end of the threaded rod (4). The bottom of the retaining sleeve (18) abuts against the shoulder. The retaining sleeve (18) is used to pass through the inner hole of the lower end cover (14) to press the lower pin shaft (8) back into the lower blind groove; It is characterized in that: The tool shaft includes a positioning rod (19) fixedly connected to the upper end of the threaded rod (4). The positioning rod (19) is fixedly connected with a shaft ring (20). An annular clamping groove (21) is provided on the outer peripheral side of the shaft ring (20). The main machine housing (1) is provided with an elastic clamping member that is in clamping fit with the annular clamping groove (21). An inner groove is provided on the corresponding inner wall of the main machine housing (1) where the annular clamping groove (21) is located. The elastic clamping member includes a third spring (22) provided in the inner groove and a ball block (23) connected to the third spring (22). A plurality of the first arc-shaped platforms (15) coaxial with it are evenly spaced on the bottom surface of the upper end cover (13). A plurality of the second arc-shaped platforms (16) coaxial with it are evenly spaced on the top surface of the lower end cover (14). A plurality of the upper blind grooves are evenly spaced on the upper end surface of the feed nut (5). The upper pin shafts (7) are slidably arranged in each of the upper blind grooves. A first spring (6) is provided between each upper pin shaft (7) and the bottom of the corresponding upper blind groove. The plurality of upper pin shafts (7) correspond to the plurality of first arc-shaped platforms (15) one by one. A plurality of the lower blind grooves are evenly spaced on the lower end surface of the feed nut (5). The lower pin shafts (8) are slidably arranged in each of the lower blind grooves. A second spring (9) is provided between each lower pin shaft (8) and the bottom of the corresponding lower blind groove. The plurality of lower pin shafts (8) correspond to the plurality of second arc-shaped platforms (16) one by one.

2. The feed and retract structure of a full-automatic beveling machine according to claim 1, characterized in that, the cross-section of the annular clamping groove is triangular.

3. The feed and retract structure of a full-automatic beveling machine according to claim 1, characterized in that, the upper end cover (13), the main gear ring (12) and the lower end cover (14) are fixedly connected by bolts.

4. The control method of the feed and retract structure of a full-automatic beveling machine according to any one of claims 1 to 3 includes the following specific steps: S1. The tool shaft is in the retracted state waiting for processing. The driving device drives the tool shaft to rotate clockwise through the connection of the first transmission component (2). At this time, the upper pin shaft (7) extends out and contacts and slides on the slope wall of the first arc-shaped platform (15). The first arc-shaped platform (15) does not block the circumferential rotation movement of the upper pin shaft (7). The bottom of the retaining sleeve (18) abuts against the shoulder. The top of the retaining sleeve (18) pushes the lower pin shaft (8) back into the lower blind groove, so that the second arc-shaped platform (16) also does not block the circumferential rotation movement of the lower pin shaft (8). S2. The driving device drives the feed gear assembly (10) to rotate by connecting the second transmission assembly (11), so that the rotational speed of the feed gear assembly (10) is greater than that of the tool shaft to form a positive slip. The feed gear assembly (10) rotates clockwise relative to the tool shaft. The retaining wall of the first arc platform (15) abuts against the upper pin shaft (7) to make the feed nut (5) also rotate at the same speed as the feed gear assembly (10), so that the feed nut (5) rotates clockwise relative to the tool shaft. The feed nut (5) makes the tool shaft extend downward through the thread until the positioning sleeve (17) presses the upper pin shaft (7) back into the upper blind groove, and the tool shaft no longer descends, realizing automatic feeding; at this time, although the top of the retaining sleeve (18) no longer abuts against the lower pin shaft, the lower pin shaft (8) contacts and slides along the slope wall of the second arc platform (16), and the second arc platform (16) does not block the rotation of the feed nut (5). S3. The driving device is disconnected from the second transmission assembly (11), and the feed gear assembly (10) is clamped and stationary. The rotational speed of the feed gear assembly (10) is less than that of the tool shaft to form a reverse slip. The feed gear assembly (10) rotates counterclockwise relative to the tool shaft. The retaining wall of the second arc platform (16) abuts against the lower pin shaft (8) to make the feed nut (5) also stationary with the feed gear assembly (10), so that the feed nut (5) rotates counterclockwise relative to the tool shaft. The feed nut (5) makes the tool shaft retract upward through the thread until the retaining sleeve (18) presses the lower pin shaft (8) back into the lower blind groove, and the tool shaft no longer retracts upward, realizing automatic retraction; at this time, although the positioning sleeve (17) no longer presses the upper pin shaft (7), the upper pin shaft (7) contacts and slides along the slope wall of the first arc platform (15), and the first arc platform (15) does not block the rotation of the feed nut (5). S4. When the tool shaft retracts upward to the in-place position, the elastic clamping member snaps into the annular card slot (21) to finely adjust the position of the feed nut (5), so that a gap is formed between the upper end face of the feed nut (5) and the upper end cover (13), and a gap is also formed between the lower end face of the feed nut (5) and the lower end cover (14).

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