A locking pin structure for connecting a nail feed tube of a gun body of a nail gun and a transfer joint

Abstract

The utility model provides a kind of lock pin structure of connecting welding nail gun gun body nail feeding pipe and transfer joint, gun body nail feeding pipe and transfer joint are connected and fixed by lock pin structure;The end of gun body nail feeding pipe is provided with nail inlet, the profile of nail inlet is set as the arch shape of being convenient for welding nail import, and the arch shape is made of a flat bottom and the arc side extending from the bottom two ends upwards;The end of transfer joint is provided with connecting portion, and the connecting portion is set as at least partially nested in the inside of nail inlet, so that the inner hole of gun body nail feeding pipe and the inner hole of connecting portion are smoothly transitioned at connecting portion, so that welding nail is not moved when passing;Lock pin structure includes first locking member and first locking position;First through hole is provided on the pipe wall of nail inlet, and first locking member is rotatably arranged in first through hole, and first locking position is arranged on connecting portion in the circumferential direction;By driving first locking member radial rotation, make first locking member and first locking position engage or separate, and then realize the locking or release of nail inlet and connecting portion.

Description

Technical Field

[0001] This utility model belongs to the technical field of stud nailing machine welding nail gun, specifically relating to a locking pin structure that connects the nail feeding tube of the welding nail gun body and the intermediate connector. Background Technology

[0002] A stud welding gun is a device used to weld and fix studs, mainly used in high-rise steel structure buildings, industrial plant buildings, highways, railways, bridges, and other fields. A stud welding machine works by using a burst of high current to firmly weld the stud to a metal panel. Stud welding machines are increasingly used in sheet metal manufacturing, and stud welding guns are involved in multiple fields such as welding equipment, automation equipment, electrical equipment, and mechanical equipment research and development.

[0003] In traditional welding nail guns, the welding nails must be kept perpendicular to the surface of the workpiece to maintain welding quality. In automatic welding nail guns, the nail feed tube is a channel connecting the main body of the welding gun and the head of the gun. It is used to accurately guide the welding nails from the nail feeder or rubber / plastic nail feed tube to the nail gripping mechanism at the head of the gun, and to protect the welding nails from getting stuck, worn, or deformed during the feeding process.

[0004] The nail feed tube of the welding gun and the rubber / plastic nail feed tube are usually connected by an adapter. The adapter and the nail inlet of the nail feed tube are usually connected by threads. During the vibration and movement of the welding nail gun, this threaded connection structure is prone to loosening. During installation and subsequent use, gaps may appear at the connection section, which can easily cause nail jamming, affect the progress of the work, and cause losses. Alternatively, the presence of gaps may cause slight displacement of the tube, resulting in a slight displacement of the nail's central axis during nail feeding. This can lead to a deviation in the perpendicular angle between the welding nail's central axis and the workpiece surface, affecting the welding effect.

[0005] To ensure that the center axis of the welding stud remains perpendicular to the surface of the workpiece to be welded, it is necessary to ensure that the angle at which the welding stud is fed through the stud feeding tube into the welding gun head remains accurate. Therefore, it is necessary to design a connection structure between the stud feeding tube and the transfer joint that is different from the traditional threaded connection. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that the threaded connection between the nail feed tube and the transfer connector in the prior art easily leads to nail jamming or misalignment. Therefore, this invention provides a locking pin structure for connecting the nail feed tube and the transfer connector of a welding nail gun.

[0007] To achieve the above objectives, the present invention proposes the following technical solution: A locking pin structure for connecting the nail feeding tube of a welding nail gun body and the intermediate connector, wherein the nail feeding tube of the gun body and the intermediate connector are connected and fixed by the locking pin structure; The end of the nail feeding tube of the gun body is provided with a nail inlet. The outline of the nail inlet is set as an arch shape to facilitate the introduction of the welding nail. The arch shape is composed of a flat bottom edge and arc-shaped side edges extending upward from both ends of the bottom edge. The end of the transfer connector is provided with a connecting part, which is configured to be at least partially nested inside the nail inlet, so that the inner hole of the nail feeding tube of the gun body and the inner hole of the connecting part are smoothly transitioned at the connection, so that the welding nail has no movement interference when it passes through. The locking pin structure includes a first locking element and a first locking position; The tube wall of the nail inlet is provided with a first through hole, the first locking member is rotatably inserted into the first through hole, and the connecting part is provided with a first locking position circumferentially; By driving the first locking member to rotate radially, the first locking member engages or disengages from the first locking position, thereby achieving the locking or releasing of the nail inlet and the connecting part.

[0008] Furthermore, the first locking member includes a first locking pin, and a relief portion is provided on the radial side of the first locking pin; When the first locking pin passes through the first through hole, the first locking pin has a first position and a second position; In the first position, the receptive portion faces the inside of the nail inlet, and the surface of the receptive portion and the inner wall of the nail inlet together form a smooth and continuous guide surface, allowing the connecting portion to be inserted into or removed from the nail inlet; In the second position, the first locking pin rotates radially, causing the accommodating portion to deviate from the position corresponding to the first position. The side of the first locking pin is at least partially embedded in the first locking position, thereby forming axial interference with the outer surface of the connecting portion and preventing the connecting portion from coming out of the pin inlet.

[0009] Furthermore, the accommodating portion is an axially recessed plane machined on the cylindrical surface of the first locking pin; The depth of the axial recessed plane is adapted to the radial gap between the first locking pin and the first through hole, so that when the first locking pin is in the first position, the axial recessed plane is flush with the inner wall of the pin inlet.

[0010] Furthermore, the first locking position is an annular groove disposed on the outer wall of the connecting part and surrounding the outer periphery of the connecting part; When the first locking pin is rotated to the second position, the radial side cylindrical portion of the first locking pin abuts against the sidewall of the annular groove.

[0011] Furthermore, the first locking element also includes an elastic element; The tail end face of the first locking pin is provided with a mounting hole. One end of the elastic element is installed and fixed in the mounting hole, and the other end is in contact with the bottom wall of the first through hole, so that the elastic element continuously applies axial force to the first locking pin, so that the first locking pin has an outward first axial position. When the first locking pin is under pressure from the head toward the tail, the first locking pin has an inward second axial position.

[0012] Furthermore, the locking pin structure also includes a second locking element; A locking hole is provided on the plane of the nail inlet facing the end of the connecting part, and the central axis of the locking hole is perpendicular to the central axis of the first locking member. The second locking member is detachably or fixedly installed in the locking hole; The head of the first locking pin is provided with a boss, and the side wall of the boss is provided with a first sliding groove in the circumferential direction. The second locking member extends into the first sliding groove to restrict its axial displacement while the first locking pin rotates.

[0013] Furthermore, the first groove is a partial annular groove surrounding the outer periphery of the side wall of the head of the first locking pin, and the end of the second locking member is embedded in the partial annular groove.

[0014] Furthermore, the circumferential range of the partial annular groove is adapted to the rotation angle of the first locking pin between the first position and the second position.

[0015] Furthermore, the sidewall of the boss is also provided with a second sliding groove, which is disposed at at least one end of the first sliding groove; The width of the second groove in the direction parallel to the central axis of the first locking pin is greater than the width of the first groove in that direction. When the first locking pin is in the second axial position, the end of the second locking member is in the first groove; When the first locking pin is in the first axial position, the extension direction of the second groove is parallel to the extension direction of the locking hole, forming an open channel that allows the second locking member to enter.

[0016] Furthermore, the outer end face of the head of the first locking pin is provided with a tool interface for cooperating with a tool to drive the first locking pin to rotate; The tool interface is a groove formed on the outer end face of the head of the first locking pin, and the groove is one of a slotted groove, a cross groove, an internal hexagonal hole, or a Phillips head groove.

[0017] The beneficial effects of this utility model are: This utility model addresses the problem in existing technologies where the threaded connection between the nail feed tube and the adapter easily leads to nail jamming or misalignment. It designs a locking pin structure with multiple combined tightening and fixing mechanisms, achieving a highly stable and high-quality connection between the nail feed tube and the adapter. Specifically, it includes: (1) By setting a first locking pin and a first through hole, the present invention specifically sets a relief part on the first locking pin. When the recessed plane of the relief part is facing the first through hole towards the inner wall of the nail inlet, it forms a smooth surface with the surrounding inner wall of the nail inlet. There are no depressions or grooves, ensuring that the inner wall of the pipe is smooth when the connecting part enters the nail inlet, forming a continuous surface without steps in both visual and tactile senses. This ensures that when the welding nail is transported in this pipe, its surface or tail will not scratch the inner wall of the pipe or the edge of the groove, thus eliminating the risk of nail jamming.

[0018] (2) This utility model provides a first locking position on the connecting part of the transfer connector. Specifically, the first locking position is set as an annular groove. At the same time, by only the radial rotation of the first locking pin, its complete cylindrical surface, that is, the recessed part where the non-relief part is located, is turned towards the direction of the nail inlet tube wall. This causes the side cylindrical surface of the first locking pin to be embedded in the first locking position and to fit tightly against its surface, generating huge friction and mechanical interference, thereby firmly locking the connecting part into the nail inlet, forming the first compression and fixing mechanism. At the same time, the cooperative structure of the first locking position and the first locking pin allows the connecting part to rotate on its own after being inserted into the nail inlet. It can be locked by the first locking pin at any circumferential angle, which is convenient for assembly and fixing.

[0019] (3) By setting the elastic locking pin mechanism of the first locking member and the second locking member and locking hole that work together with it, on the one hand, the axial direction of the second locking member is set perpendicular to the axial direction of the first locking pin, and a first sliding groove is set at the head of the first locking pin, so that when the first locking pin rotates, the inner end of the second locking member is in the first sliding groove, which does not affect the rotation of the first locking pin and prevents mechanical jamming and other faults. At the same time, it ensures that the first locking pin will not pop out or fall out axially in the high-speed and high-frequency vibration environment, thus enhancing the locking function. On the other hand, the first locking pin is combined with the elastic member at the tail end, and its elastic locking pin mechanism is combined with the second locking member. That is, the first locking pin can only be rotated in the pressing state, and the first locking pin is fixed in the reset state, so that it cannot rotate on its own in the normal state, forming a double compression and fixing mechanism with the cooperation of the second locking member and the elastic member, which further improves the safety and reliability of the entire locking pin structure.

[0020] (3) Based on the above technical solution, the present invention provides a second slide groove at the head of the first locking pin and one end of the first slide groove, and precisely limits the device size of the first slide groove, the second slide groove and the second locking member, so as to ensure that the second locking member can be installed through the second slide groove when the first locking pin is in the reset state, making the assembly more convenient; at the same time, keyway-shaped groove inlets are provided at both ends of the first slide groove, avoiding the need for the second locking member to be precisely aligned with the tiny opening of the first slide groove during the assembly process, which greatly improves the assembly efficiency.

[0021] (4) Based on the above technical solution, the present invention provides a tool interface on the outer end face of the head of the first locking pin, which is used to cooperate with the tool to drive the first locking pin to rotate, thereby improving the convenience of use and improving the assembly and use efficiency.

[0022] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0023] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0024] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings. The embodiments in the drawings do not constitute any limitation on the present invention. Other drawings can be obtained by those skilled in the art based on the following drawings without inventive effort: Figure 1 This is a schematic diagram of the overall structure of the nail feeding tube and the transfer joint of the welding nail gun body in this embodiment of the utility model; Figure 2 This is a schematic diagram of the adapter structure in an embodiment of this utility model; Figure 3 This is a schematic diagram of the nail feeding tube of the welding nail gun body in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the first locking member of the locking pin structure in this utility model embodiment; Figure 5 This is a side view of the first locking member of the locking pin structure in an embodiment of this utility model. Figure 1 ; Figure 6 This is a side view of the first locking member of the locking pin structure in an embodiment of this utility model. Figure 2 ; Figure 7 This is a side view of the first locking member of the locking pin structure in an embodiment of this utility model. Figure 3 .

[0025] Legend: 1. Nail feed tube; 11. Nail inlet; 12. First through hole; 13. Locking hole; 2. Adapter; 21. Connecting part; 22. First locking position; 3. First locking element; 31. First locking pin; 311. Relief part; 312. First slide groove; 313. Second slide groove; 314. Tool interface; 315. Mounting hole; 32. Elastic element. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0027] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] See attached document Figure 1 As shown, this utility model provides a locking pin structure for connecting the nail feeding tube of the welding nail gun body and the intermediate connector.

[0029] See attached document Figure 2 As shown, the end of the nail feeding tube 1 of the gun body is provided with a nail inlet 11. The outline of the nail inlet 11 is arched, consisting of a flat bottom edge and arc-shaped side edges extending upward from both ends of the bottom edge.

[0030] See attached document Figure 3 As shown, the end of the transfer connector 2 is provided with a connecting part 21, which is adapted to and connected to the aforementioned nail inlet 11.

[0031] Specifically, the connecting part 21 is configured to be at least partially nested inside the nail inlet 11, thereby allowing the inner hole of the nail feeding tube 1 of the gun body and the inner hole of the connecting part 21 to smoothly transition at the connection point, so that the welding nail does not move and interfere when passing through.

[0032] Specifically, the inner diameter of the nail feed tube 1 is equal to the inner diameter of the transfer connector 2, and they are aligned at the connection point. The inner wall of the nail feed tube 1 and the inner wall of the transfer connector 2 together form a continuous feeding channel at the connection point.

[0033] Specifically, the inner diameter of the connecting part 21 is the same as the inner diameter of the nail feeding tube 1 of the gun body. In order to adapt to the connecting part 21, the inner diameter of the nail inlet 11 is adapted to the outer diameter of the connecting part 21 and is larger than the inner diameter of the nail feeding tube 1 of the gun body.

[0034] See attached document Figure 4 -Appendix Figure 7 As shown, the locking pin structure is used to connect and fasten the connecting part 21 and the nail inlet 11, and specifically includes a first locking member 3, a second locking member and a first locking position 22.

[0035] The first locking element 3 is an elastic locking pin assembly, including a first locking pin 31 and an elastic element 32.

[0036] The radial side of the first locking pin 31 is provided with a relief portion 311, which is an axially recessed plane formed on the cylindrical surface of the first locking pin 31.

[0037] Specifically, a portion of the cylindrical surface of the first locking pin 31 is milled along its axial direction to form a recessed plane, the cross-section of which can be D-shaped. The shape of the recessed plane corresponds to the shape of the first through hole 12 that is correspondingly carved out in the inner wall of the nail inlet 11. When the recessed plane is facing the first through hole 11 toward the inner wall of the nail inlet 11, it forms a smooth surface with the surrounding inner wall of the nail inlet 11, without any depressions or grooves, ensuring that the inner wall of the latter is smooth when the connecting part 21 enters the nail inlet 11.

[0038] The head outer end face of the first locking pin 31 is provided with a tool interface 314 for cooperating with a tool to drive the first locking pin 31 to rotate.

[0039] Specifically, the tool interface 314 is a groove formed on the outer end face of the head of the first locking pin 31. The groove is one of a slotted groove, a cross groove, an internal hexagonal hole, or a Phillips head groove. Different tools are selected for use according to the specifications and shape of the groove.

[0040] The tube wall of the nail inlet 11 is provided with a first through hole 12, which can be a threaded hole. The first locking member 3 is rotatably inserted into the first through hole 12 through thread engagement.

[0041] The connecting part 21 is provided with a first locking position 22 in the circumferential direction, which is a circumferential groove arranged around its central axis along the circumferential direction of the outer wall of the connecting part 21. The first locking position 22 is an annular groove provided on the outer wall of the connecting part 21 and surrounding the outer circumference of the connecting part 21, and is used in conjunction with the first locking pin 31.

[0042] Specifically, by driving the first locking member 3 to move radially, the first locking member 3 is engaged or disengaged from the first locking position 22, thereby locking or releasing the nail inlet 11 and the connecting part 21.

[0043] When the first locking pin 31 is inserted into the first through hole 12, the first locking pin 31 has a first position and a second position.

[0044] In the first position, the receptive portion 311 faces the inside of the nail inlet 11, and the surface of the receptive portion 311 and the inner wall of the nail inlet 11 together form a smooth and continuous guide surface, allowing the connecting portion 21 to be inserted into or removed from the nail inlet 11.

[0045] Specifically, the depth of the axial recessed plane of the accommodating part 311 is adapted to the radial gap between the first locking pin 31 and the first through hole 12, so that when the first locking pin 31 is in the first position, the axial recessed plane is flush with the inner wall of the nail inlet 11. At this time, it is in the unlocked state, and the recessed plane of the accommodating part 311 is directly facing the internal space of the nail inlet 11, and the connecting part 21 can be inserted or removed without obstruction.

[0046] The depth of the axial recessed plane of the relief part 311 is precisely designed to be equal to or slightly greater than the radial gap between the outer surface of the first locking pin 31 and the inner wall of the first through hole 12. Therefore, when the first locking pin 31 is rotated to the first position, the axial recessed plane of the relief part 311 is smoothly connected to the inner wall of the nail inlet 11, forming a continuous surface without steps in both visual and tactile senses. This ensures that when the welding nail is transported in this pipe, its surface or tail will not scratch the inner wall of the pipe or the edge of the groove, eliminating the risk of nail jamming.

[0047] In the second position, the first locking pin 31 rotates radially, causing the accommodating part 311 to deviate from the position corresponding to the first position. The cylindrical side of the first locking pin 31 is at least partially embedded in the first locking position 22, thereby forming axial interference with the outer surface of the connecting part 21 and preventing the connecting part 21 from coming out of the pin inlet 11.

[0048] Specifically, when the first locking pin 31 is rotated to the second position, the radial cylindrical surface of the first locking pin 31 abuts against the side wall of the annular groove. This is the locked state. After inserting the connecting part 21 into the nail inlet 11 through the aforementioned retrieval state, to prevent it from dislodging, after the connecting part 21 is inserted, the first locking pin 31 is rotated so that its complete cylindrical surface, i.e., the non-recessed portion, faces the wall of the nail inlet 11. At this time, the cylindrical surface of the first locking pin 31 is embedded in the first locking position 22 and tightly adheres to its surface, generating significant friction and mechanical interference, thereby firmly locking the connecting part 21 into the nail inlet 11.

[0049] The above-mentioned annular groove design allows the connecting part 21 to rotate on its own after being inserted into the nail inlet 11, and it can be locked by the first locking pin 31 at any circumferential angle, which facilitates assembly and fixation.

[0050] A locking hole 13 is provided on the end plane of the nail inlet 11 facing the connecting part 21. The central axis of the locking hole 13 is perpendicular to the central axis of the first locking member 3. The second locking member is detachably or fixedly installed in the locking hole 13.

[0051] The second locking component can be a cylindrical metal locating pin, which is fixed in the locking hole 13 by thread or press fitting. Its main function is to fix the first locking pin 31 so that it cannot rotate on its own under normal conditions.

[0052] To ensure that the first locking pin 31 will not pop out or come off axially under high-speed and high-frequency vibration, this embodiment sets a second locking member as a second safety measure, which works in conjunction with the first locking pin 31 to enhance the locking function.

[0053] The head of the first locking pin 31 is provided with a boss, and the side wall of the boss is provided with a first sliding groove 312. The second locking part extends into the first sliding groove 312 to restrict its axial displacement while the first locking pin 31 rotates.

[0054] The first groove 312 is a partial annular groove surrounding the outer periphery of the head side wall of the first locking pin 31, and the end of the second locking member is embedded in the partial annular groove.

[0055] The circumferential range of the aforementioned annular groove is adapted to the rotation angle of the first locking pin 31 between the first position and the second position.

[0056] Specifically, on the head sidewall of the first locking pin 31, a partial annular groove structure is machined. It is not a complete circle around the head sidewall of the first locking pin 31, but maintains the original cylindrical outer diameter within an arc length of about 80° to 100°, with the rest being set as a groove.

[0057] The boss sidewall is also provided with a second slide groove 313, which is located at at least one end of the first slide groove 312. The profile width of the second slide groove 313 in the direction parallel to the central axis of the first locking pin 31 is greater than the profile width of the first slide groove 312 in that direction, and the profile width of the first slide groove 312 in that direction is greater than the diameter of the second locking member, thereby ensuring that the second locking member can enter the locking hole 13 along the open port of the second slide groove 313.

[0058] The depth of the first groove 312 is set such that when the first locking pin 31 is pressed to its axial movement limit distance, the second locking member still has a gap with the two axial sidewalls of the first groove 312, thereby ensuring that the first locking pin 31 will not have a hard collision or jam in any operating position under the pressing state, thus improving the reliability and durability of the locking pin structure.

[0059] The tail end face of the first locking pin 31 is provided with a mounting hole 315. The mounting hole 315 is a blind hole with an inner diameter that matches the outer diameter of the elastic member 32. One end of the elastic member 32 is installed and fixed in the mounting hole 315, and the other end is in contact with the bottom wall of the first through hole 12, so that the elastic member 32 continuously applies an axial force to the first locking pin 31, so that the first locking pin 31 has an outward first axial position under the action of the elastic member 32, which is the reset state; when the first locking pin 31 is under the pressing force from the head to the tail, that is, under the condition of overcoming the continuous pre-tightening force provided by the elastic member 32, the first locking pin 31 has an inward second axial position, which is the pressing state.

[0060] Specifically, the elastic element 32 can be a helical spring or a torsion spring, and the mounting hole 315 can be a blind hole or a circular groove machined at the tail end of the first locking pin 31.

[0061] Preferably, the elastic element 32 is a small spring, and the mounting hole 315 is a circular groove. The inner diameter of the circular groove is compatible with the outer diameter of the small spring, so that one end of the small spring can be fixed inside the circular groove.

[0062] When the first locking pin 31 is in the pressed state, the end of the second locking member is in the first groove 312, and the first locking pin 31 can rotate; when the first locking pin 31 is in the reset state, the extension direction of the second groove 313 is parallel to the extension direction of the locking hole 13, forming an open channel that allows the second locking member to enter.

[0063] During assembly, first align the elastic element 32 with the mounting hole 315 at the tail of the first locking pin 31 and press it in, so that the elastic element 32 is partially embedded in the mounting hole 315. Then, insert the first locking pin 31 into the first through hole 12 and it is in a reset state under the action of the elastic element 32. Then, press the first locking pin 31 along its axial direction and rotate to adjust the angle of the first locking pin 31 until the extension direction of its second sliding groove 313 is parallel to the extension direction of the locking hole 13. Insert the second locking element into the locking hole 13 and remove the pressing force. The inner end plug of the second locking element will be embedded in the first sliding groove 312 at the head of the first locking pin 31, allowing the first locking pin 31 to rotate freely within the allowable angle range corresponding to the groove structure of the first sliding groove 312. However, its axial movement is restricted by the engagement of the second locking element with the bosses on both sides of the groove of the first sliding groove 312, and it cannot pop out.

[0064] Meanwhile, when the first locking pin 31 is in the reset state, the second locking member cannot be removed. When the extension direction of the second slide groove 313 is offset from the extension direction of the locking hole 13, the inner end plug of the second locking member will be restricted by the boss in the same radial direction of the second slide groove 313. This ensures that when the first locking pin is in the reset state, the first locking pin 31 cannot be rotated through the tool interface 314. A pressing force must be applied to it to make it in the pressed state before the first locking pin 31 can be rotated, which further improves the safety and reliability of the entire locking pin structure.

[0065] In some alternative embodiments, at least one end of the partial annular groove of the first slide groove 312 is provided with a groove inlet, which extends circumferentially along the sidewall of the head of the first locking pin 31; the profile of the groove inlet is consistent with and smoothly connected to the partial annular groove, forming an open channel that allows the second locking member to enter. The profile formed by the partial annular groove and the groove inlet together forms an open keyway-like structure on the outer cylindrical sidewall of the head of the first locking pin 31.

[0066] Specifically, the aforementioned groove inlet is used to guide the second locking member into the first slide groove 312 during assembly. To simplify assembly, a groove inlet is provided at the end of the first slide groove 312. The groove inlet is a direct extension and opening of the groove of the first slide groove 312 along the circumferential direction of the head side of the first locking pin 31. Its cross-sectional profile can be U-shaped, and its depth and width are set to allow the cylindrical second locking member to pass smoothly.

[0067] The aforementioned groove inlet structure avoids the need for the second locking component to be precisely aligned with the tiny opening of the first slide groove 312 during assembly, greatly improving assembly efficiency.

[0068] In this embodiment, the assembly and usage process of the locking pin structure connecting the nail feed tube of the welding nail gun body and the intermediate connector is as follows: First, press the elastic element 32 into the mounting hole 315 at the tail end of the first locking pin 31, and insert the first locking pin 31 into the first through hole 12 from the tail end where the elastic element 32 is located. Use a tool to apply pressure to the first locking pin 31, and rotate and adjust its direction through the tool interface 314 so that the extension direction of the second slide groove 313 is parallel to the extension direction of the locking hole 13.

[0069] Then, the second locking member is inserted into the second sliding groove 313 in the locking hole 13, the pressing pressure is removed, and the inner end plug of the second locking member is embedded in the first sliding groove 312 of the head of the first locking pin 31.

[0070] At this point, the assembly of the locking pin structure is complete.

[0071] When in use, apply pressure to the first locking pin 31 using a tool, and rotate and adjust its direction through the tool interface 314 so that the receiving part 311 of the first locking pin 31 is aligned with the inner wall of the nail inlet 11 and forms a continuous and smooth connecting surface. Remove the pressure, and then insert the connecting part 21 of the intermediate connector 2 into the nail inlet 11 until its inner hole smoothly transitions at the connection point.

[0072] Then, apply pressure to the first locking pin 31 again using the tool, and rotate and adjust its direction through the tool interface 314, so that the receiving part 311 of the first locking pin 31 is offset from its installation position, until its cylindrical part is embedded in the first locking position 22 of the connecting part 21, and the connecting part 21 cannot be dislodged.

[0073] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

[0074] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. Technical details not described in detail in this utility model can all be implemented by any existing technology in the art. In particular, all technical features not described in detail in this utility model can be implemented by any existing technology.

Claims

1. A locking pin structure for connecting the nail feed tube of a welding nail gun body and a transfer joint, characterized in that, The nail feed tube and the transfer connector are connected and fixed by a locking pin structure; The end of the nail feeding tube of the gun body is provided with a nail inlet. The outline of the nail inlet is set as an arch shape to facilitate the introduction of the welding nail. The arch shape is composed of a flat bottom edge and arc-shaped side edges extending upward from both ends of the bottom edge. The end of the transfer connector is provided with a connecting part, which is configured to be at least partially nested inside the nail inlet, so that the inner hole of the nail feeding tube of the gun body and the inner hole of the connecting part are smoothly transitioned at the connection, so that the welding nail has no movement interference when it passes through. The locking pin structure includes a first locking element and a first locking position; The tube wall of the nail inlet is provided with a first through hole, the first locking member is rotatably inserted into the first through hole, and the connecting part is provided with a first locking position circumferentially; By driving the first locking member to rotate radially, the first locking member engages or disengages from the first locking position, thereby achieving the locking or releasing of the nail inlet and the connecting part.

2. The locking pin structure for connecting the nail feed tube of a welding nail gun body and the intermediate connector according to claim 1, characterized in that, The first locking member includes a first locking pin, and a relief portion is provided on the radial side of the first locking pin; When the first locking pin passes through the first through hole, the first locking pin has a first position and a second position; In the first position, the receptive portion faces the inside of the nail inlet, and the surface of the receptive portion and the inner wall of the nail inlet together form a smooth and continuous guide surface, allowing the connecting portion to be inserted into or removed from the nail inlet; In the second position, the first locking pin rotates radially, causing the accommodating portion to deviate from the position corresponding to the first position. The side of the first locking pin is at least partially embedded in the first locking position, thereby forming axial interference with the outer surface of the connecting portion and preventing the connecting portion from coming out of the pin inlet.

3. The locking pin structure for connecting the nail feed tube of a welding nail gun body and the intermediate connector according to claim 2, characterized in that, The allowable portion is an axially recessed plane machined on the cylindrical surface of the first locking pin; The depth of the axial recessed plane is adapted to the radial gap between the first locking pin and the first through hole, so that when the first locking pin is in the first position, the axial recessed plane is flush with the inner wall of the pin inlet.

4. The locking pin structure for connecting the nail feed tube of the welding nail gun body and the intermediate connector according to claim 3, characterized in that, The first locking position is an annular groove disposed on the outer wall of the connecting part and surrounding the outer periphery of the connecting part; When the first locking pin is rotated to the second position, the radial side cylindrical portion of the first locking pin abuts against the sidewall of the annular groove.

5. A locking pin structure for connecting the nail feed tube of a welding nail gun body and a transfer joint according to claim 2, characterized in that, The first locking element also includes an elastic element; The tail end face of the first locking pin is provided with a mounting hole. One end of the elastic element is installed and fixed in the mounting hole, and the other end is in contact with the bottom wall of the first through hole, so that the elastic element continuously applies axial force to the first locking pin, so that the first locking pin has an outward first axial position. When the first locking pin is under pressure from the head toward the tail, the first locking pin has an inward second axial position.

6. The locking pin structure for connecting the nail feed tube of the welding nail gun body and the intermediate connector according to claim 5, characterized in that, The locking pin structure also includes a second locking element; A locking hole is provided on the plane of the nail inlet facing the end of the connecting part, and the central axis of the locking hole is perpendicular to the central axis of the first locking member. The second locking member is detachably or fixedly installed in the locking hole; The head of the first locking pin is provided with a boss, and the side wall of the boss is provided with a first sliding groove in the circumferential direction. The second locking member extends into the first sliding groove to restrict its axial displacement while the first locking pin rotates.

7. A locking pin structure for connecting the nail feed tube of a welding nail gun body and a transfer joint according to claim 6, characterized in that, The first groove is a partial annular groove surrounding the outer periphery of the side wall of the head of the first locking pin, and the end of the second locking member is embedded in the partial annular groove.

8. The locking pin structure for connecting the nail feed tube of a welding nail gun body and the intermediate connector according to claim 7, characterized in that, The circumferential range of the partial annular groove is adapted to the rotation angle of the first locking pin between the first position and the second position.

9. A locking pin structure for connecting the nail feed tube of a welding nail gun body and a transfer joint according to claim 7, characterized in that, The side wall of the boss is also provided with a second sliding groove, which is located at at least one end of the first sliding groove; The width of the second groove in the direction parallel to the central axis of the first locking pin is greater than the width of the first groove in that direction. When the first locking pin is in the second axial position, the end of the second locking member is in the first groove; When the first locking pin is in the first axial position, the extension direction of the second groove is parallel to the extension direction of the locking hole, forming an open channel that allows the second locking member to enter.

10. A locking pin structure for connecting the nail feed tube of a welding nail gun body and a transfer joint according to claim 2, characterized in that, The head outer end face of the first locking pin is provided with a tool interface for cooperating with a tool to drive the first locking pin to rotate; The tool interface is a groove formed on the outer end face of the head of the first locking pin, and the groove is one of a slotted groove, a cross groove, an internal hexagonal hole, or a Phillips head groove.

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