An improved and efficient tail handle punching device for a precision wire thread insert to prevent tail handle omission

Abstract

The present invention provides an improved efficient wire thread insert tail handle punching device for preventing tail handle omission, which includes a first sleeve with an air hole opened at the top and an opening provided at the bottom; the top of the second sleeve is inserted into the first sleeve and is tangentially arranged with the inner wall of the first sleeve, and the first sleeve moves up and down along the outer wall of the second sleeve; a punch is inserted into the port of the second sleeve away from the first sleeve; a punch retaining ring is installed between the punch and the second sleeve, and the head of the punch extends out of the punch retaining ring; a strong magnet is sleeved on the second guiding section. The present invention takes the second sleeve as a fixed reference, and the first sleeve impacts downward under the action of manual driving, so that the punch obtains a punching force; a punch retaining ring is equipped, which is perpendicular to the base material and is beneficial to punching the tail handle, is convenient for replacement, and adapts to different specifications of tail handles; the strong magnet transmits magnetism to the punch and the punch retaining ring, and the strong magnet is not stressed during the whole movement, reducing the risk of fragmentation caused by direct contact, and sucking out the tail handle directly through the punch.

Description

Technical Field

[0001] The present invention relates to the field of installation of wire thread inserts, especially the field of removal of the shanks of wire thread inserts, and specifically to an improved efficient and strict wire thread insert shank punching device for preventing shank omission. Background Art

[0002] As an internal thread fastener, a wire thread insert is screwed into a mating hole through an installation tool. Due to its own characteristics, an installation shank, that is, a shank, which bends towards the center is formed at the end of the wire thread insert. Before the workpiece product is installed into the wire thread insert, the shank needs to be removed.

[0003] When the workpiece to be installed by the customer is a blind hole, considering that the shank needs to be removed after the wire thread insert is installed, the shank will remain in the blind hole after being punched off and needs to be taken out specifically.

[0004] However, in the process or step of taking out the shank, since it is manually operated, it is inevitable that there will be omissions, which will cause individual shanks to still be in the blind hole, leading to abnormal noises or even short - circuit problems in subsequent use and production.

[0005] A prior art discloses a screw sleeve tail wire punching device with the patent number CN208600630U, which discloses a screw sleeve tail wire punching device including an upper sleeve and a lower sleeve. The lower sleeve is inserted into the upper sleeve from the lower port of the upper sleeve and can slide up and down along the inner wall of the upper sleeve. A lower sleeve limit and stop structure is provided between the upper sleeve and the lower sleeve. A punch and a return spring are provided in the lower sleeve. A guide hole for sliding the punch up and down is provided at the lower end of the lower sleeve. A punch limit and stop structure is provided between the lower sleeve and the punch. The lower end of the return spring presses against the punch. A punch rod that slides up and down along the inner wall of the lower sleeve and a punching spring connected to the upper end of the punch rod are provided in the upper sleeve. The upper end of the punching spring presses against the upper end of the upper sleeve. The upper end of the return spring presses against the upper end of the punch rod. A spring pin is provided on the punch rod, and a trigger part for triggering the spring pin is provided on the inner wall of the upper sleeve. The present invention only needs to use one hand to complete all the operations of punching the screw sleeve tail wire, with high punching efficiency and without damaging the screw sleeve.

[0006] However, in the above - mentioned technical solution, it only uses the punching device to achieve the function of punching the shank of the wire thread insert, and does not have the function of taking out the shank remaining in the structural part or the blind - hole structural part.

[0007] A prior art also discloses a shank breaking tool with a spring - driven impact device, with the patent number US3385380A. In the disclosed structure, since the punch directly contacts the shank and there is no protection device, the service life of the punch will be affected after long - term use.

[0008] Also disclosed is a tool for the breakage and removal of the shank of a coil insert. The structure for removing the shank disclosed in Patent No. US5172842A is too complex, which is not conducive to production, installation, and use;

[0009] Also disclosed is a helical insert insertion jig. Patent No. JP2000061860 discloses that a groove extending perpendicular to the extending direction of the jig body is formed at the top end of the jig body. The groove is wider than the tongue portion of the helical insertion portion and opens toward the tip of the jig body. Two magnets are installed at the tip of the jig body, and the groove is inserted between the jig bodies. The magnets are embedded in the tip of the jig body, and a part of the corresponding magnet is exposed in the groove, exceeding the opposite wall surfaces of the groove, and the exposed surface of the magnet is almost as high as the wall surface of the groove;

[0010] Furthermore, a shank breaking tool is also disclosed. Patent No. EP1078719A2 discloses a shank breaking tool that can break the shank after introducing a helical coil with a shank into a hole of a workpiece, and further, can easily and deterministically remove the broken shank. The tool has a holding portion and an operating portion, and a permanent magnet is provided at the front end of the operating portion;

[0011] Although the above two technical solutions adopt a structure of using magnetic materials to remove the tail shank, however, the magnetic materials are in direct contact with the tail shank, and there is no protection mechanism for the magnetic materials during the punching process. Therefore, over time, there is a risk of damage and breakage of the magnetic materials. Summary of the Invention

[0012] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an improved and efficient anti-tail shank omission and tight wire thread insert tail shank punching device to solve the difficulties of the prior art.

[0013] To achieve the above object and other related objects, the present invention provides an improved and efficient anti-tail shank omission and tight wire thread insert tail shank punching device, including:

[0014] A first sleeve 1, with an air hole opened at the top of the first sleeve 1, an opening provided at the bottom, and a cylindrical cavity 101 formed inside;

[0015] A second sleeve 2, which is configured with openings at both ends and a communicating structure in the middle;

[0016] The top of the second sleeve 2 is inserted into the opening of the first sleeve 1 and is tangent to the inner wall of the first sleeve 1, and the first sleeve 1 moves up and down along the outer wall of the second sleeve 2;

[0017] On the outer peripheral circle of the bottom of the second sleeve 2, a strong magnet 6 and a second guiding section 3 are installed from top to bottom. The strong magnet 6 is press-fitted into the second sleeve 2 through the second guiding section 3 at the bottom to form a fixed installation structure.

[0018] A firing pin 4, and the firing pin 4 is inserted into the port of the second sleeve 2 away from the first sleeve 1.

[0019] A firing pin retaining ring 5, and the firing pin retaining ring 5 is installed between the firing pin 4 and the second sleeve 2 to form a clearance fit among the firing pin 4, the firing pin retaining ring 5 and the second sleeve 2, and the head of the firing pin 4 extends out of the firing pin retaining ring 5.

[0020] A strong magnet 6, and the strong magnet 6 is sleeved on the second guiding section 3 at the bottom of the second sleeve 2 and is in close contact with the firing pin retaining ring 5 and the firing pin 4.

[0021] A limiting structure is arranged between the first sleeve 1 and the second sleeve 2.

[0022] In the initial state, the limiting structure is arranged at the top of the second sleeve 2.

[0023] When a downward pressure is applied to the first sleeve 1, the second sleeve 2 pushes the small steel ball 10 in the limiting structure to retract into the limiting groove 8. Since the first return spring 12 in the first sleeve 1 is pressed against the top of the second sleeve 2, when the first return spring 12 is instantaneously released, the limiting structure hits the firing pin 4 forward under the driving force of the first return spring 12 to break off the tail handle of the wire thread insert.

[0024] According to the preferred scheme, both ends of the firing pin 4 are located outside both sides of the firing pin retaining ring 5.

[0025] According to the preferred scheme, the first sleeve 1 and the second sleeve 2 are coaxially arranged.

[0026] According to the preferred scheme, the limiting structure includes:

[0027] A limiting post 7, and the outer diameter of the limiting post 7 is not greater than the inner diameter of the second sleeve 2.

[0028] A limiting groove 8, which is horizontally opened at the end of the limiting post 7, with one side open and the other side located inside the limiting post 7 to form a closed structure.

[0029] A compression spring 9, and the compression spring 9 is arranged in the limiting groove 8.

[0030] A small steel ball 10, and the small steel ball 10 is connected to the end of the compression spring 9 away from the limiting groove 8.

[0031] According to the preferred scheme, chamfers 11 are arranged on the peripheral circle at the bottom of the limiting post 7.

[0032] According to the preferred solution, in the initial state, the small steel ball 10 abuts between the inside of the first sleeve 1 and the compression spring 9, and is located above the top of the second sleeve 2.

[0033] According to the preferred solution, return springs are provided at both the top and bottom of the limit structure, and the return springs include a first return spring 12 and a second return spring 13;

[0034] The top of the first return spring 12 is connected to the inner wall of the top end of the first sleeve 1, and the other end is sleeved on the top of the limit structure;

[0035] The top of the second return spring 13 abuts against the bottom of the limit structure, and the other end is sleeved on the end of the striker 4 away from the needle tip 43.

[0036] According to the preferred solution, the number of turns of the first return spring 12 is greater than the number of turns of the second return spring 13.

[0037] According to the preferred solution, an upper connecting column 14 for correspondingly installing the first return spring 12 is provided upward at the top of the limit post 7, and the outer diameter of the upper connecting column 14 is smaller than the outer diameter of the limit post 7.

[0038] According to the preferred solution, a stepped surface 102 is provided in the cylindrical cavity 101, and the inner diameter of the end of the stepped surface 102 close to the first sleeve 1 is smaller than the diameter close to the second sleeve 2;

[0039] The inner diameter of the upper hole of the stepped surface 102 is not less than the outer diameter of the limit post 7.

[0040] According to the preferred solution, the cross section of the stepped surface 102 is inclined, and correspondingly, the circumference of the limit post 7 on the side close to the upper connecting column 14 is correspondingly inclined.

[0041] According to the preferred solution, an annular first guiding section 15 is installed on the outer circumference of the first sleeve 1 close to the second sleeve 2, and the bottom annular structure 151 of the first guiding section 15 is screwed onto the external thread of the second sleeve 2 through an internal thread;

[0042] The second sleeve 2 is provided with a limiting end 16 extending towards the outer circumference corresponding to the bottom annular structure 151, and the bottom annular structure 151 is restricted within a height not exceeding the limiting end 16 during movement.

[0043] According to the preferred solution, a folding area 17 is provided at the top of the first guiding section 15, and the folding area 17 is screwed into the side wall of the first sleeve 1.

[0044] According to the preferred solution, a knurled structure 18 is provided on the outer circumference of the first guiding section 15.

[0045] According to the preferred embodiment, the knurling structure 18 adopts diagonal knurling or diamond knurling or bolt knurling.

[0046] According to the preferred embodiment, the firing pin 4 successively includes from top to bottom:

[0047] A lower connecting column 41, on which a second return spring 13 is sleeved and installed, located in the cavity of the second sleeve 2;

[0048] A needle rod 42, which is coaxially arranged at the bottom of the lower connecting column 41, located in the second sleeve 2 and the second guiding section 3, and forms an installation gap with the inner cavities of the second sleeve 2 and the second guiding section 3;

[0049] A needle tip 43, which is coaxially arranged at the bottom of the needle rod 42, with the top extending into the second guiding section 3 and the bottom extending outside the second guiding section 3;

[0050] The outer diameters of the lower connecting column 41, the needle rod 42, and the needle tip 43 gradually decrease in sequence.

[0051] According to the preferred embodiment, the firing pin retaining ring 5 successively includes from top to bottom:

[0052] A connecting platform 51, the top of which supports the bottom of the lower connecting column 41, and the outer peripheral circle abuts against the inner cavity wall of the second sleeve 2;

[0053] A connecting sleeve 52, which is integrally arranged at the bottom of the connecting platform 51, extends from the second sleeve 2 to the cavity of the second guiding section 3, and the connecting sleeve 52 is tightly arranged in the gap between the needle rod 42 and the second sleeve 2 and the second guiding section 3;

[0054] A retaining ring 53, which is integrally arranged below the connecting sleeve 52, extends from the bottom outlet end of the second guiding section 3 to the upper region of the needle tip 43.

[0055] According to the preferred embodiment, a supporting step surface 201 for supporting the connecting platform 51 is formed in the inner cavity of the second sleeve 2 corresponding to the connecting platform 51. The supporting step surface 201 is located below the connecting platform 51, and the inner diameter of the lower surface is smaller than the outer diameter of the connecting sleeve 52.

[0056] According to the preferred embodiment, the strong magnet 6 adopts an annular structure.

[0057] According to the preferred embodiment, the outer diameter of the strong magnet 6 is greater than or equal to the outer diameter of the second guiding section 3, and the inner hole diameter is greater than or equal to the inner diameter of the second guiding section 3.

[0058] According to the preferred embodiment, the horizontal distance between the strong magnet 6 and the firing pin 4 is smaller than the distance between the second guiding section 3 and the firing pin 4.

[0059] The present invention obtains the following beneficial effects:

[0060] (1) Obtaining the punching force: Taking the second sleeve as the fixed reference, the first sleeve strikes downward under the action of manual drive, so that the punch obtains the punching force;

[0061] (2) Equipped with a punch retaining ring: When the first sleeve strikes downward, it can disperse the direct impact of the punching force on the punch, playing an effective protective role and extending the service life. In addition, the outer diameter of the retaining ring is smaller than the inner diameter of the wire thread insert after installation. When the puncher is inserted into the wire thread insert, it can ensure perpendicularity to the base material, so as to better punch off the tail handle;

[0062] (3) The punch and the retaining ring are two separate and replaceable structures: After using for a period of time, once the punch is damaged, the structure can be conveniently disassembled to replace the punch, and then it can be used continuously without affecting the efficiency;

[0063] (4) The punch and the retaining ring can be adapted to remove tail handles of different specifications: In order to adapt to removing the tail handles of wire thread inserts of different specifications, the punch and the punch retaining ring can be replaced with corresponding specifications and models, that is, the purpose of using this tail handle puncher to remove the tail handles of wire thread inserts of different specifications can be achieved;

[0064] (5) Installed a strong magnet: Using the strong magnet to transmit the magnetism to the punch and the punch retaining ring, and directly sucking out the tail handle accurately and efficiently by the punch at the punching station;

[0065] (6) The strong magnet does not directly contact the workpiece: The strong magnet is installed at the top of the second guiding section, effectively avoiding direct contact with the workpiece. There is a spacing between the strong magnet and the workpiece during work, and the strong magnet is not stressed during the whole movement, improving the service life and reducing the risk of fragmentation caused by direct contact.

[0066] In the following, the optimal embodiments of implementing the present invention will be described in more detail with reference to the accompanying drawings, so as to easily understand the features and advantages of the present invention. Brief Description of the Drawings

[0067] Figure 1 Showing a three-dimensional structural schematic diagram of the present invention;

[0068] Figure 2 Showing a half-sectional view of the present invention;

[0069] Figure 3 Showing a top view of the present invention;

[0070] Figure 4 Showing a sectional view of the present invention;

[0071] Figure 5 Showing as Figure 4 An enlarged structural schematic diagram of point A;

[0072] Figure 6 Shown as Figure 4 Schematic diagram of the enlarged structure of the midpoint B;

[0073] Figure 7 Shown as Figure 4 Schematic diagram of the enlarged structure of the midpoint C;

[0074] Figure 8 Shown as the three-dimensional structure diagram of the first sleeve in the present invention;

[0075] Figure 9 Shown as the three-dimensional structure diagram of the limit structure in the present invention;

[0076] Figure 10 Shown as the three-dimensional structure diagram of the firing pin in the present invention;

[0077] Figure 11 Shown as the three-dimensional structure diagram of the firing pin retaining ring in the present invention;

[0078] Figure 12 Shown as the three-dimensional structure diagram of the assembled firing pin and firing pin retaining ring in the present invention;

[0079] Label description

[0080] 1. First sleeve,

[0081] 101. Cylindrical cavity,

[0082] 102. Step surface;

[0083] 2. Second sleeve,

[0084] 201. Support step surface;

[0085] 3. Second guiding section;

[0086] 4. Firing pin,

[0087] 41. Lower connecting column,

[0088] 42. Needle rod,

[0089] 43. Needle tip;

[0090] 5. Firing pin retaining ring,

[0091] 51. Connecting platform,

[0092] 52. Connecting sleeve,

[0093] 53. Retaining ring;

[0094] 6. Strong magnet;

[0095] 7. Limit post;

[0096] 8. Limit groove;

[0097] 9. Compression spring;

[0098] 10. Small steel ball;

[0099] 11. Chamfer;

[0100] 12. First return spring;

[0101] 13. Second return spring;

[0102] 14. Upper connecting post;

[0103] 15. First guiding section,

[0104] 151. Bottom annular structure;

[0105] 16. Limit end;

[0106] 17. Folding area;

[0107] 18. Knurled structure. Detailed implementation manners

[0108] In order to make the objectives, technical solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the specific embodiments of the present invention. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are 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 described embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0109] Compared with the embodiments shown in the drawings, the feasible implementation solutions within the protection scope of the present invention may have fewer components, have other components not shown in the drawings, different components, differently arranged components or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0110] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present invention pertains. The terms "first", "second" and similar terms used in the description and claims of this patent application for the invention do not denote any order, quantity or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not necessarily denote a quantity limitation. Terms such as "comprising" or "including" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0111] The present invention provides an improved high-efficiency and tight wire thread insert tail stock punching device for preventing tail stock omission, which is used for the requirement of removing and taking out the tail stock after the wire thread insert is installed. The present invention does not limit the type of the wire thread insert, but the structure of this tail stock punch is particularly suitable for the structure where the workpiece to be installed is a blind hole.

[0112] Generally, the improved high-efficiency and tight wire thread insert tail stock punching device provided by the present invention mainly includes a first sleeve 1, a second sleeve 2, a punch pin 4, a punch pin retaining ring 5 and a strong magnet 6. Among them, reference can be made to Figure 1 , which shows the layout relationship of the first sleeve 1, the second sleeve 2, the punch pin 4, the punch pin retaining ring 5 and the strong magnet 6.

[0113] In order to achieve the purpose of removing the tail stock before the workpiece product is installed into the wire thread insert and avoiding omission of taking out, and to solve the problem in the background technology that when the workpiece to be installed by the customer is a blind hole, after the wire thread insert is installed, the tail stock needs to be removed, and then the tail stock will remain in the blind hole after being punched and needs to be taken out specially. Therefore, in the technical solution provided in this embodiment, an improved high-efficiency and tight wire thread insert tail stock punching device for preventing tail stock omission is provided.

[0114] As Figure 1 shown, according to the purpose of using the punch, a first sleeve 1 and a second sleeve 2 which are coaxially arranged and inserted into each other are provided, and the internal structures of the first sleeve 1 and the second sleeve 2 are as shown in Figure 2 and Figure 4As shown in the figure, the top of the first sleeve 1 is provided with air holes for exhausting air, the bottom is provided with an opening, and a cylindrical cavity 101 is formed inside for inserting the second sleeve 2; the second sleeve 2 is set with openings at both ends and a communicating structure in the middle. In this embodiment, with the second sleeve 2 as the fixed reference, the top of the second sleeve 2 is inserted into the opening of the first sleeve 1 and is tangent to the inner wall of the first sleeve 1. The first sleeve 1 moves along the outer wall of the second sleeve 2 under manual driving. A limiting structure is arranged between the first sleeve 1 and the second sleeve 2. In the initial state, the limiting structure is arranged at the top of the second sleeve 2; when a downward pressure is applied to the first sleeve 1, the second sleeve 2 pushes the small steel ball 10 in the limiting structure to retract into the limiting groove 8. Since the first return spring 12 in the first sleeve 1 is pressed against the top of the second sleeve 2 and the first return spring 12 is harder than the second return spring 13, when the first return spring 12 is instantaneously released, an impact force is obtained. The limiting structure hits the ejector pin 4 forward under the driving force of the first return spring 12 to break the tail handle of the wire thread insert.

[0115] The ejector pin 4 acting on the tail handle of the wire thread insert is inserted into the port of the second sleeve 2 far from the first sleeve 1. The head of the ejector pin 4 extends out of the ejector pin retaining ring 5, which does not affect the use effect of the ejector pin 4; in addition, considering that the ejector pin 4 needs to be hit multiple times during use, in order to reduce the damage caused by the reaction force and reduce the impact on the service life, therefore, a ejector pin retaining ring 5 is also installed between the ejector pin 4 and the second sleeve 2. The ejector pin retaining ring 5 is sleeved on the ejector pin 4 to form a clearance fit among the ejector pin 4, the ejector pin retaining ring 5 and the second sleeve 2, obtaining a tightly arranged effect, dispersing the direct impact of the breaking force on the ejector pin 4, and being able to play an effective protective role. It should be further noted that because there is an ejector pin retaining ring 5, the outer diameter of the retaining ring 53 can be slightly smaller than the inner diameter of the wire thread insert after installation. When the wire thread insert is inserted into the wire thread insert, the perpendicularity to the base material can be ensured, so as to better break the tail handle.

[0116] In addition, there are also the following advantages: when the structure provided in this embodiment is used for a period of time, once the ejector pin 4 is damaged, the structure can be easily disassembled to replace the ejector pin 4, and then it can be used continuously without affecting the efficiency;

[0117] When the structure provided in this embodiment expands its applicability to adapt to removing the tail handles of wire thread inserts of different specifications, the ejector pin 4 and the ejector pin retaining ring 5 can also be replaced with corresponding specifications and models, that is, the purpose of using this tail handle breaker to remove the tail handles of wire thread inserts of different specifications can be achieved.

[0118] In order to stably install the ejector pin 4 and obtain a stable structure between the ejector pin 4 and the ejector pin retaining ring 5, specifically, as Figure 10As shown, the structure of the firing pin 4 is arranged as a lower connecting column 41, a needle rod 42, and a needle tip 41 that are integrally arranged in sequence from top to bottom. In terms of consistent stability and acting force, the lower connecting column 41, the needle rod 42, and the needle tip 41 are coaxially arranged; in addition, as Figure 11 shown, the firing pin buckle 5 is arranged with a connecting platform 51, a connecting sleeve 52, and a buckle 53 in sequence from top to bottom. Since the firing pin buckle 5 is sleeved outside the firing pin 4, it is correspondingly arranged in a coaxial structure.

[0119] During use, since the firing pin 4 and the firing pin buckle 5 are stationary and do not move relative to each other, on the one hand, in terms of their own structures, as Figure 12 shown, the bottom of the lower connecting column 41 of the firing pin 4 is supported by the connecting platform 51, which plays a supporting role and serves the purpose of preventing downward movement; the outer side of the needle rod 42 is covered by the connecting sleeve 52. Since the outer diameter of the needle rod 42 is larger than the outer diameter of the needle tip 41, the connecting sleeve 52 extends from the needle rod 42 to the needle tip 41, playing a continuous protective role; further, the buckle 53 is arranged to cover the outer circumference of the needle tip 41, exposing the end of the needle tip 41, without affecting the actual use effect;

[0120] On the other hand, in terms of structural installation, the firing pin 4 and the firing pin buckle 5 are located in the second sleeve 2 and the second guiding section 3 at the bottom of the second sleeve 2. In order to play a supporting and limiting role for the firing pin 4, for this reason, combined with Figure 7 , a supporting step surface 201 for supporting the connecting platform 51 is formed in the cavity of the second sleeve 2 corresponding to the connecting platform 51. The supporting step surface 201 is located below the connecting platform 51, and the inner diameter of the lower hole of the step surface 201 is smaller than the outer diameter of the connecting sleeve 52, so as to achieve the effects of support and limitation and prevent the firing pin 41 from moving downward;

[0121] Further, as Figure 2 and Figure 4 shown, only the lower connecting column 41 is provided in the cavity of the second sleeve 2, and the supporting connecting platform 51 is placed on the supporting step surface 201; the needle rod 42 and the connecting sleeve 52 are both located at the bottom of the lower connecting column 41 and inside the second sleeve 2; one end of the needle tip 43 is located in the second guiding section 3, and the other end extends outside the second sleeve 2, and the correspondingly sleeved buckle 53 extends from the bottom outlet end of the second guiding section 3 to the upper region of the needle tip 43.

[0122] In this embodiment, the ejector pin 4 and the ejector pin retaining ring 5 can be two separate and independent structures. On the one hand, they are used to correspond to large-sized wire thread inserts. Also, according to different product specifications, the corresponding matching-sized ejector pin 4 and ejector pin retaining ring 5 can be replaced to adapt to removing the shanks of different-sized wire thread inserts, so as to achieve the purpose of using this shank punch to remove the shanks of different-sized wire thread inserts. On the other hand, if any structure of the ejector pin 4 and the ejector pin retaining ring 5 is damaged or worn, the structure can be conveniently disassembled for replacement and continued use without affecting efficiency. Thirdly, the ejector pin retaining ring 5 can be made smaller than the inner diameter according to the actual wire thread insert specifications. When the punch is inserted into the wire thread insert, it can ensure perpendicularity to the base material, thereby better punching off the shank. In addition, they can also be integrally arranged structures for small-sized wire thread inserts.

[0123] Specifically, when the ejector pin 4 completes the punching, to avoid the remaining of the shank, in this embodiment, as Figure 1 , 2 and Figure 4 shown, a strong magnet 6 is sleeved on the second guiding section 3 at the bottom of the second sleeve 2 to prevent the strong magnet 6 from directly contacting the workpiece, which improves the service life and reduces the risk of fragmentation caused by direct contact. The strong magnet 6 is preferably in a circular ring structure, and there is no restriction on the outer peripheral structure. The inner peripheral ring corresponds to the external structure of the second sleeve 2. In addition, the purpose of setting the strong magnet 6 here is to transmit the magnetism to the ejector pin 4 and the ejector pin retaining ring 5 through the strong magnet 6, and directly suck out the shank by the ejector pin 4 at the punching station. Therefore, it is necessary to ensure that the gap between the strong magnet 6, the ejector pin 4 and the ejector pin retaining ring 5 does not affect the transmission of magnetism. In this embodiment, on the one hand, the outer diameter of the strong magnet 6 is greater than or equal to the outer diameter of the second guiding section 3 to ensure that the thickness of the strong magnet 6 has sufficient magnetism. On the other hand, the inner hole diameter of the strong magnet 6 is greater than or equal to the inner diameter of the second guiding section 3, that is, an installation area is provided inwardly in the area where the second sleeve 2 installs the strong magnet 6, and the outer diameter of this installation area is smaller than the outer diameter of the second sleeve 2 body, that is, the horizontal distance between the inner wall of the strong magnet 6 and the ejector pin 4 is smaller than the distance between the inner wall of the second guiding section 3 and the ejector pin 4.

[0124] After the shank punch completes the punching, the first sleeve 1 needs to be reset and move upward in the reverse direction along the second sleeve 2. Also, considering the positioning function of the first sleeve 1 after resetting, first, a limiting structure is provided between the first sleeve 1 and the second sleeve 2, so that in the initial state and the reset state of the first sleeve 1, the limiting structure can be clamped at the top of the second sleeve 2 to achieve the purpose of holding the first sleeve 1 in the initial position. In addition, when performing the punching action, after the first sleeve 1 applies downward pressure, the limiting structure can be squeezed into the inner cavity of the second sleeve 2 and play a role in transmitting the punching force.

[0125] Specifically, Figure 2 , 4 As shown in Figures 1 and 9, a limiting column 7 is provided in the limiting structure, and the limiting column 7 can move up and down in the cavity in the first sleeve 1 and the second sleeve 2, so the outer diameter of the limiting column 7 is not greater than the inner diameter of the second sleeve 2; secondly, a limiting groove 8 for horizontally installing the compression spring 9 is provided on the end of the limiting column 7, and one side of the limiting groove 8 is opened to insert the compression spring 9, and the other side is located in the column of the limiting column 7 to form a closed structure, which is used to resist the other end of the compression spring 9, and the small steel ball 10 used to protrude or be stuck in the limiting groove 8 is connected to the end of the compression spring 9 away from the limiting groove 8;

[0126] When the first sleeve 1 is compressed downward, the second sleeve 2 pushes the small steel ball 10 and the compression spring 9 to be squeezed back into the limiting groove 8. Since the No. 1 reset spring 12 has a greater elastic force than the No. 2 reset spring 13, once the limiting column 7 drives the small steel ball 10 into the cavity of the second sleeve 2, the No. 1 reset spring 12 will be instantly and quickly released during this time, causing the limiting column 7 to run forward quickly and hit the firing pin 4, so that the firing pin 4 can achieve the purpose of breaking the tail handle of the wire thread sleeve.

[0127] like Figure 4 and 9 As shown, in order to increase the connectivity between the No. 1 return spring 12 and the limit column 7 and prevent the two from loosening when they are compressed and rebounded, an upper connecting column 14 corresponding to the No. 1 return spring 12 is arranged upward on the top of the limit column 7, and the outer diameter of the upper connecting column 14 is smaller than the outer diameter of the limit column 7; in addition, as shown in FIG. Figure 6 As described above, during use, due to the up and down movement, in order to prevent the No. 2 return spring 13 from getting stuck, chamfers 11 are provided around the bottom of the limiting column 7 .

[0128] Here, in order to enable the first sleeve 1 to form a coaxial motion stroke in the same direction when moving rapidly toward the second sleeve 2, as shown in FIG. Figure 5 As shown, an inclined step surface 102 corresponding to the truncated cone structure around the top of the limiting column 7 is provided in the cylindrical cavity 101, and the inner diameter of the end of the step surface 102 close to the first sleeve 1 is smaller than the diameter close to the second sleeve 2;

[0129] On this basis, it is preferred that Figure 6 andFigure 8 As shown in the figure, a ring-shaped first guiding section 15 is installed on the outer peripheral circle of the first sleeve 1 close to the second sleeve 2. A knurling structure 18 is arranged on the outer peripheral circle of the first guiding section 15. The knurling structure 18 adopts diagonal knurling or diamond knurling or bolt knurling, which effectively increases the friction force for the operator and improves work efficiency. At the same time, to avoid the separation between the first guiding section 15 and the first sleeve 1 due to repeated use, a folding area 17 is provided at the top of the first guiding section 15. The folding area 17 is screwed into the side wall of the first sleeve 1. The first guiding section 15 is screwed onto the external thread of the second sleeve 2 through the internal thread of the bottom annular structure 151. Since the minimum inner diameter of the folding area 17 is smaller than the maximum outer diameter of the second sleeve 2, after the first guiding section 15 is tightened on the first sleeve 1, the second sleeve 2 will not fall out of the first sleeve 1. The second sleeve 2 is provided with a limiting end 16 extending towards the outer peripheral circle corresponding to the bottom annular structure 151. The bottom annular structure 151 is restricted to a height not exceeding that of the limiting end 16 during movement.

[0130] Correspondingly, the bottom outer diameter of the second sleeve 2 is slightly larger than the other outer diameters by 1-2 mm. The second guiding section 3 is made of plastic, so that the second guiding section 3 can be installed on the second sleeve 2 by means of interference pressing. During use, the second guiding section 3 will not fall off the second sleeve 2. And after the punching tail handle is broken off, the plastic second guiding section 3 abuts against the aluminum plate of the product and will not damage the product.

[0131] The above embodiments merely illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An improved and efficient tail handle punching device for preventing omission of tail handles of precision wire thread inserts, characterized in that, Comprising: A first sleeve (1), with air holes opened at the top of the first sleeve (1), an opening provided at the bottom, and a cylindrical cavity (101) formed inside; A second sleeve (2), which is arranged with openings at both ends and a structure with a connection in the middle; The top of the second sleeve (2) is inserted into the opening of the first sleeve (1) and is tangent to the inner wall of the first sleeve (1), and the first sleeve (1) moves up and down along the outer wall of the second sleeve (2); A strong magnet (6) and a second guiding section (3) are installed on the outer circumference of the bottom of the second sleeve (2) from top to bottom, and the strong magnet (6) is press-fitted into the second sleeve (2) through the second guiding section (3) at the bottom to form a fixed installation structure; A firing pin (4), which is inserted into the port of the second sleeve (2) away from the first sleeve (1); A firing pin retaining ring (5), which is installed between the firing pin (4) and the second sleeve (2) to form a clearance fit among the firing pin (4), the firing pin retaining ring (5) and the second sleeve (2), and the head of the firing pin (4) extends out of the firing pin retaining ring (5); A limiting structure is provided between the first sleeve (1) and the second sleeve (2); In the initial state, the limiting structure is arranged at the top of the second sleeve (2); When a downward pressure is applied to the first sleeve (1), the second sleeve (2) pushes the small steel balls (10) in the limiting structure to retract into the limiting groove (8). Since the first return spring (12) in the first sleeve (1) is pressed against the top of the second sleeve (2), when the first return spring (12) is instantly released, the limiting structure hits the firing pin (4) forward under the driving force of the first return spring (12) to break off the tail handle of the wire thread insert; The limiting structure includes: A limiting post (7), the outer diameter of the limiting post (7) is not greater than the inner diameter of the second sleeve (2); A limiting groove (8), which is horizontally opened at the end of the limiting post (7), with one side open and the other side forming a closed structure inside the limiting post (7); A compression spring (9), which is arranged in the limiting groove (8); A small steel ball (10), which is connected to the end of the compression spring (9) away from the limiting groove (8).

2. The improved efficient wire thread insert shank punching device for preventing shank omission tightly according to claim 1, wherein In the initial state, the small steel ball (10) abuts between the inside of the first sleeve (1) and the compression spring (9), and is above the top of the second sleeve (2).

3. The improved efficient wire thread insert shank punching device for preventing shank omission tightly according to claim 2, characterized in that, Return springs are provided at both the top and the bottom of the limiting structure, and the return springs include a first return spring (12) and a second return spring (13); The top of the first return spring (12) is connected to the inner wall at the top end of the first sleeve (1), and the other end is sleeved on the top of the limiting structure; The top of the second return spring (13) abuts against the bottom of the limiting structure, and the other end is sleeved on the end of the firing pin (4) away from the needle tip (43).

4. The improved efficient wire thread insert shank punching-off device for preventing shank omission tightly according to claim 3, characterized in that, The top of the limiting post (7) is provided with an upper connecting post (14) for correspondingly installing the first return spring (12) facing upward, and the outer diameter of the upper connecting post (14) is smaller than the outer diameter of the limiting post (7).

5. The improved efficient wire thread insert shank punching device for preventing shank omission tightly according to claim 4, characterized in that, A stepped surface (102) is provided inside the cylindrical cavity (101), and the inner diameter of the stepped surface (102) near one end of the first sleeve (1) is smaller than the diameter near the second sleeve (2). The inner diameter of the upper hole of the stepped surface (102) is not less than the outer diameter of the limit post (7).

6. The improved efficient wire thread insert shank punching device for preventing shank omission tightly according to claim 5, characterized in that, An annular first guiding section (15) is installed on the outer peripheral circle of the first sleeve (1) near the second sleeve (2), and the bottom annular structure (151) of the first guiding section (15) is screwed onto the external thread of the second sleeve (2) through an internal thread. The second sleeve (2) is provided with a limiting end (16) extending towards the outer peripheral circle corresponding to the bottom annular structure (151), and the bottom annular structure (151) is restricted within a height not exceeding that of the limiting end (16) during movement.

7. The improved efficient wire thread insert shank punching device for preventing shank omission tightly according to claim 6, characterized in that, A knurled structure (18) is provided on the outer peripheral circle of the first guiding section (15).

8. The improved efficient wire thread insert shank punching device for preventing shank omission tightly according to claim 7, characterized in that, The striker (4) includes successively from top to bottom: A lower connecting column (41), on which a second return spring (13) is sleeved and installed, located inside the cavity of the second sleeve (2). A needle rod (42), which is coaxially arranged at the bottom of the lower connecting column (41), located inside the second sleeve (2) and the second guiding section (3), and forms an installation gap with the inner cavities of the second sleeve (2) and the second guiding section (3). A needle tip (43), which is coaxially arranged at the bottom of the needle rod (42), with the top extending into the second guiding section (3) and the bottom extending outside the second guiding section (3). The outer diameters of the lower connecting column (41), the needle rod (42), and the needle tip (43) gradually decrease in sequence.

9. The improved efficient wire thread insert shank punching device for preventing shank omission tightly according to claim 8, characterized in that, The striker retaining ring (5) includes successively from top to bottom: A connecting platform (51), the top of which supports the bottom of the lower connecting column (41), and the outer peripheral circle abuts against the inner cavity wall of the second sleeve (2). A connecting sleeve (52), which is integrally provided at the bottom of the connecting platform (51), extends from the second sleeve (2) into the cavity of the second guiding section (3), and the connecting sleeve (52) is tightly arranged in the gap between the needle rod (42) and the second sleeve (2) and the second guiding section (3). A retaining ring (53), which is integrally provided below the connecting sleeve (52), extends from the bottom outlet end of the second guiding section (3) to the upper region of the needle tip (43).

10. The improved efficient wire thread insert shank punching device for preventing shank omission tightly according to claim 9, characterized in that The strong magnet (6) adopts a circular ring structure.

11. The improved efficient tail handle omission-proof tight wire thread insert tail handle punching device according to claim 10, characterized in that, The outer diameter of the strong magnet (6) is greater than or equal to the outer diameter of the second guiding section (3), and the inner hole diameter is greater than or equal to the inner diameter of the second guiding section (3).

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