A nail gun punch automatic centering structure for the needle assembly

Abstract

This utility model discloses an automatic centering structure for a nail gun punch assembly, relating to the field of electric nail guns. It includes a piston and a punch. The piston is installed inside a cylinder. A central hole is formed at the front end of the piston, into which a pad is inserted. Installation grooves are radially formed on both sides of the central hole, into which the punch is inserted. A gap is left between the upper and lower surfaces of the punch and the installation grooves. Symmetrical lugs are provided at the end of the punch inserted into the installation groove. The end of the punch away from the piston engages with a nail ejection guide in a slotted manner. A fixing pin is inserted on the piston at a position corresponding to the lug, positioning the lug between the fixing pin and the pad. A gap is also left between the lug and the corresponding fixing pin. When the piston slides back and forth along the axis of the cylinder, and the punch slides back and forth along the axis of the nail ejection guide, the punch and piston move relative to each other within the gap range. This utility model employs a completely free connection between the punch and the piston, preventing jamming or forced movement during the movement of the punch assembly.

Description

Technical Field

[0001] This utility model relates to the field of electric nail guns, specifically to a nail gun punch automatic centering structure needle assembly. Background Technology

[0002] Nail guns are commonly used electric nailing tools. After assembly, the cylinder, gun head, gun cover and other guide parts of the existing nail gun are fixed on the cylinder head seat. Since each part has machining errors (tolerances), it is difficult for the cylinder axis and the guide axis of the gun head and gun cover to be on the same axis. In addition, there is a gap between the punch and the guide parts, so there will inevitably be errors in concentricity and perpendicularity.

[0003] In this situation, it's impossible to guarantee that the needle assembly moves in a straight line; there will be tilting. The piston cannot move concentrically up and down along the cylinder, and the punch cannot move up and down along the axis of the guide. If the needle assembly has a tight connection between the piston and the punch (without degrees of freedom), it will inevitably cause the needle assembly to jam or move forcibly during its movement, leading to various unpredictable problems such as power loss, wear of parts, and wear and leakage of seals on the piston. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a nail gun punch automatic centering structure needle assembly. The punch and piston are connected in a completely free manner, so that the needle assembly will not get stuck or forced during the movement of the needle assembly, thus ensuring the stability and reliability of the nail gun and extending its service life.

[0005] The purpose of this utility model is achieved through the following technical solution: This nail gun punch automatic centering structure needle assembly is installed inside the nail gun body. The nail gun body has a nail ejection guide at the front and a cylinder at the rear. The needle assembly includes a piston and a punch. The piston is installed inside the cylinder. A central hole is opened at the front end of the piston for inserting a pad. Installation grooves are radially opened on both sides of the central hole for inserting the punch. A gap is left between the upper and lower surfaces of the punch and the installation groove. A hanging ear is symmetrically provided at the end of the punch that is inserted into the installation groove. The end of the punch away from the piston is engaged with the nail ejection guide in a slotted manner. A fixing pin is inserted on the piston at a position corresponding to the hanging ear, so that the hanging ear is located between the fixing pin and the pad. A gap is also left between the hanging ear and the corresponding fixing pin. When the piston slides back and forth along the axis of the cylinder and the punch slides back and forth along the axis of the nail ejection guide, the punch and the piston also move relative to each other within the gap range.

[0006] As a further technical solution, a pin hole is made through the piston for inserting a fixing pin.

[0007] As a further technical solution, a guide groove is opened on the surface of the punch to cooperate with the guide boss on the nail guide body.

[0008] As a further technical solution, several slots are opened along the circumferential direction of the outer wall of the piston. Each slot is annular and distributed along the axial direction of the piston. A piston ring is installed in at least one slot. The piston ring guides the piston's movement along the cylinder and isolates the piston from the cylinder wall. Sealing rings are installed in the remaining slots to fit the cylinder wall.

[0009] As a further technical solution, a punch guide sleeve is provided between the front end of the cylinder and the nail ejector guide to guide the punch.

[0010] As a further technical solution, a buffer pad is embedded in the punch guide sleeve, and the buffer pad abuts against the front end face of the cylinder to limit the piston's sliding stroke along the cylinder and buffer the piston.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. The punch and piston can move relative to each other within a certain range through the reserved gap. Even if there are concentricity or perpendicularity errors between the cylinder axis and the guide axis of the gun head and gun cover during production and assembly, the gap range can be used for adjustment, avoiding wear and scrap of parts caused by long-term use, improving reliability and extending service life.

[0013] 2. The punch is equipped with a lug, which is inserted into the mounting groove of the piston and positioned and fixed with a fixing pin. While leaving a gap, it also ensures that the punch will not detach from the piston, forming an integral gun needle assembly with strong stability.

[0014] 3. A pad is installed inside the piston to press against the punch. During transmission, the pad can act as a buffer to avoid damage to the punch caused by hard collision. The piston is buffered by the buffer pad at the front end of the cylinder to ensure stable and reliable operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the nail gun body in this utility model.

[0016] Figure 2 This is a cross-sectional structural diagram of the nail gun body in this utility model.

[0017] Figure 3 for Figure 2 A magnified view of a portion of region A in the middle.

[0018] Figure 4 This is an exploded view of the piston and punch structure in this utility model.

[0019] Figure 5 This is a cross-sectional view of the piston and punch assembled in this utility model.

[0020] Figure 6 for Figure 5 A bottom view.

[0021] Figure 7 This is a schematic diagram of the structure of the piston and punch after assembly in this utility model.

[0022] Explanation of reference numerals in the attached drawings: Cylinder 1, Piston 2, Center Hole 21, Mounting Slot 22, Pin Hole 23, Slot 24, Punch 3, Hanging Ear 31, Guide Slot 32, Buffer Pad 4, Punch Guide Sleeve 5, Nail Discharge Guide Body 6, Guide Boss 61, Piston Ring 7, Pad Block 8, Fixing Pin 9, Sealing Ring 10, Nail Gun Body 11, Gap 12. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings:

[0024] Example: As attached Figures 1-7 As shown, this nail gun punch automatic centering structure includes a cylinder 1, a piston 2, a center hole 21, a mounting groove 22, a pin hole 23, a slot 24, a punch 3, a hanging ear 31, a guide groove 32, a buffer pad 4, a punch guide sleeve 5, a nail ejection guide body 6, a guide boss 61, a piston ring 7, a pad block 8, a fixing pin 9, a sealing ring 10, a nail gun body 11, and a gap 12.

[0025] Reference Appendix Figure 1 , 2 The nail gun assembly is installed inside the nail gun body 11. A nail guide 6 is provided at the front of the nail gun body 11, and a cylinder 1 is provided at the rear of the nail gun body 11. The nail gun body 11 also includes a battery pack for power supply and a nail clip for storing nails, all of which are existing structures and will not be described in detail here.

[0026] like Figure 2 , 3 As shown in Figure 4, piston 2 is installed inside cylinder 1. A central hole 21 is opened at the front end of piston 2, and a pad 8 is inserted into the central hole 21. Mounting grooves 22 are radially opened on both sides of the central hole 21, and punches 3 are inserted into the mounting grooves 22. Figure 6 As shown, after the punch 3 is inserted into the mounting slot 22, a certain gap 12 remains between the upper and lower surfaces of the punch 3 and the mounting slot 22. Further, as... Figure 4 , 5As shown in Figure 7, one end of the punch 3 inserted into the mounting groove 22 is symmetrically provided with a lug 31. At the same time, the end of the punch 3 away from the piston 2 is engaged with the nail guide 6 in a slotted manner (preferably, a guide groove 32 is opened on the surface of the punch 3, and the guide groove 32 is used to engage with the guide boss 61 on the nail guide 6). A fixing pin 9 is inserted on the piston 2 at the position corresponding to the lug 31, so that the lug 31 is located between the fixing pin 9 and the pad 8, and a gap 12 is also left between the lug 31 and the corresponding fixing pin 9. When the piston 2 slides back and forth along the axis of the cylinder 1, and the punch 3 slides back and forth along the axis of the nail guide 6, the punch 3 and the piston 2 can also move relative to each other within the gap 12 to achieve adjustment and adaptation.

[0027] Preferably, a pin hole 23 is formed through the piston 2, and a fixing pin 9 is inserted into the pin hole 23. The fixing pin 9 and the piston 2 are fitted with an interference fit or a clearance fit. The left and right ends of the piston are riveted together to form a single gun needle component.

[0028] Reference Appendix Figure 3 , 4 Four grooves 24 are formed along the circumference of the outer wall of the piston 2. Each groove 24 is annular and distributed along the axial direction of the piston 2. Piston rings 7 are installed in the front and rear grooves 24. Preferably, the piston rings 7 are made of polytetrafluoroethylene (Teflon) or POM (acetal). The piston rings 7 can guide the piston 2 during its movement relative to the cylinder 1, and at the same time isolate the piston 2 from the inner wall of the cylinder 1, preventing the piston 2 from scratching the inner wall of the cylinder 1. In addition, sealing rings 10 are installed in the two middle grooves 24. The sealing rings 10 can cooperate with the inner wall of the cylinder 1 to achieve a seal.

[0029] In addition, such as Figure 2 , 3 As shown, a punch guide sleeve 5 is provided between the front end of the cylinder 1 and the ejector guide 6 to guide the punch 3. A buffer pad 4 is embedded in the punch guide sleeve 5 and abuts against the front end face of the cylinder 1, thereby limiting the stroke of the piston 2 along the cylinder 1 and buffering the piston 2.

[0030] The working process of this utility model:

[0031] During assembly, the lug 31 on the punch 3 is inserted into the mounting groove 22 of the piston 2. The punch 3 is then connected to the piston 2 via a fixing pin 9. The fixing pin 9 and the piston 2 are either interference-fitted or clearance-fitted. The left and right ends of the piston 2 are riveted together to secure the fixing pin 9 and the piston 2, forming a single, integrated gun needle component. A gap 12 is left between the punch 3 and the mounting groove 22 of the piston (e.g., ...). Figure 6 As shown), a gap 12 is also left between the lug 31 on the punch 3 and the fixing pin 9 (as shown). Figure 5As shown in the figure, this forms a completely free connection between the punch 3 and the piston 2, allowing them to move relative to each other within the range of the gap 12, thus achieving adjustment and adaptation.

[0032] Because the connection between the punch 3 and the piston 2 is completely free, the piston 2 will always move concentrically back and forth along the axial direction in the cylinder 1, while the punch 3 moves along the axis of the ejector guide 6. Both move along their own paths, but they can also be linked, such as... Figure 2 As shown, when moving to the left, piston 2 pushes punch 3 to the left through pad block 8. When moving to the right, piston 2 pulls the hanging lug 31 of punch 3 to the right through fixing pin 9. This can successfully solve the problem of concentricity and perpendicularity errors between the cylinder axis and the guide axis of the gun head and gun cover, which can cause the gun needle assembly to get stuck or be forced to move during the movement, resulting in various unpredictable problems such as loss of force, wear of parts, wear and leakage of seals on the piston.

[0033] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. A nail gun punch automatic centering structure needle assembly, installed inside the nail gun body (11), wherein a nail guide (6) is provided at the front of the nail gun body (11) and a cylinder (1) is provided at the rear of the nail gun body (11), characterized in that: The cylinder (1) includes a piston (2) and a punch (3). The piston (2) is installed inside the cylinder (1). A central hole (21) is opened at the front end of the piston (2) for inserting a pad (8). A mounting groove (22) is opened radially on both sides of the central hole (21) for inserting the punch (3). A gap (12) is left between the upper and lower surfaces of the punch (3) and the mounting groove (22). The end of the punch (3) that is inserted into the mounting groove (22) is symmetrically provided with a lug (31). The end of the punch (3) away from the piston (2) is connected to the ejector pin. The guide body (6) is slotted, and a fixing pin (9) is inserted on the piston (2) at the position corresponding to the hanging ear (31), so that the hanging ear (31) is located between the fixing pin (9) and the pad (8), and there is also a gap (12) between the hanging ear (31) and the corresponding fixing pin (9). When the piston (2) slides back and forth along the axis of the cylinder (1), and the punch (3) slides back and forth along the axis of the pin guide body (6), the punch (3) and the piston (2) are still moving relative to each other within the gap (12).

2. The nail gun punch automatic centering structure needle assembly according to claim 1, characterized in that: The piston (2) has a through-hole (23) for inserting a fixing pin (9).

3. The nail gun punch automatic centering structure needle assembly according to claim 1, characterized in that: Several slots (24) are opened along the circumferential direction of the outer wall of the piston (2). Each slot (24) is annular and distributed along the axial direction of the piston (2). A piston ring (7) is installed in at least one slot (24). The piston ring (7) guides the movement of the piston (2) along the cylinder (1) and isolates the piston (2) from the inner wall of the cylinder (1). Sealing rings (10) are installed in the remaining slots (24) to cooperate with the inner wall of the cylinder (1).

4. The nail gun punch automatic centering structure needle assembly according to claim 1, characterized in that: The punch (3) has a guide groove (32) on its surface to cooperate with the guide boss (61) on the nail guide (6).

5. The nail gun punch automatic centering structure needle assembly according to claim 1, characterized in that: A punch guide sleeve (5) is provided between the front end of the cylinder (1) and the nail guide body (6) to guide the punch (3).

6. The nail gun punch automatic centering structure needle assembly according to claim 5, characterized in that: The punch guide sleeve (5) is embedded with a buffer pad (4), and the buffer pad (4) abuts against the front end face of the cylinder (1) to limit the stroke of the piston (2) sliding along the cylinder (1) and to buffer the piston (2).

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