drive wheel

Abstract

The utility model discloses a drive wheel, including first board, second board, drive pin and the elastic ring of providing radial constraint for drive pin, drive pin one end is connected with first board swing, and drive pin other end is connected with second board swing, second board has first radial position and second radial position, when normally driving, drive pin is restricted by elastic ring and is in first radial position, when drive pin is restricted by radial resistance that exceeds threshold value, drive pin overcomes the constraint force of elastic ring and moves to second radial position radially. Discard the complex electrical sensing and locking system, and only through the mechanical cooperation of drive pin, elastic ring first board and second board, the overload protection is realized, when the staple is overload, and drive pin is blocked and directly contracts radially in straight line, and its stress direction is consistent with the direction of movement, and there is no intermediate conversion link, and the response is extremely rapid and direct, can effectively avoid the rigid impact of the pin catch, and the core transmission component is protected.

Description

Technical Field

[0001] This utility model relates to the field of nail gun technology, specifically to a drive wheel. Background Technology

[0002] An electric nail gun is a device that uses a motor as a drive source to drive a firing pin in a reciprocating motion to drive nails. With product upgrades, electric nail guns have gradually evolved from the original dual-cylinder structure to a single-cylinder structure. A single-cylinder electric nail gun generally includes a cylinder as an energy storage device, a piston-firing pin assembly that matches the cylinder, and a lifting wheel that rotates unidirectionally driven by a motor. The lifting wheel uses multiple pins on its circumference to engage with teeth on one side of the firing pin, thus enabling the firing pin to move between a first position (upper stop) and a second position (lower stop). However, sometimes, during use, single-cylinder electric nail guns... When a pin gets stuck (i.e., the pin gets stuck in the movement path of the firing pin, and the firing pin cannot fully return to the second position), when the lifting wheel rotates, the pin at the head of the lifting wheel may collide with any of the teeth of the firing pin, which may cause the pin at the head to be squeezed, collide, or break. To avoid the pin getting stuck and breaking, similar products usually adopt overload protection and other methods. When the pin is squeezed with the firing pin, the firing pin needs to be moved manually before it can work normally. As a result, problems such as complex structure, low production efficiency, high manufacturing cost, reduced work efficiency, and increased cost arise.

[0003] Patent CN202322305976.7 discloses a striker anti-jamming structure for a single-cylinder electric nail gun. When the striker reaches the first position (upper stop), the locking mechanism of the electric nail gun locks at the locking position to restrict the firing of the striker. When the lifting wheel rotates to the set position, the magnet approaches the Hall sensor and sends a signal to control the motor to stop, thus stopping the lifting wheel. In this way, when nail jamming occurs, regardless of the striker's position, the rotation of the lifting wheel can drive the striker to return to the first position (upper stop). Furthermore, when the lifting wheel rotates to the notch corresponding to the striker, it will automatically stop, and then the locking mechanism will unlock, allowing the striker to fire and nail. Although this structure can adjust the relative position of the lifting wheel and the locking teeth, the structure is quite complex with many parts, resulting in high cost. Utility Model Content

[0004] To address the technical problems of existing anti-jamming structures relying on complex electrical detection, locking mechanisms, and program control, resulting in complex systems and numerous components, this utility model proposes a drive wheel that eliminates the complex electrical sensing and locking system. Overload protection is achieved solely through the mechanical cooperation of a drive pin and an elastic ring, resulting in an extremely simple structure that greatly reduces material and manufacturing costs.

[0005] The technical solution adopted by this utility model is as follows: A drive wheel includes a first plate, a second plate, a drive pin, and an elastic ring that provides radial constraint for the drive pin. One end of the drive pin is movably connected to the first plate, and the other end of the drive pin is movably connected to the second plate. The second plate has a first radial position and a second radial position. During normal driving, the drive pin is constrained by the elastic ring and is located in the first radial position. When the drive pin is subjected to radial resistance exceeding a threshold, the drive pin overcomes the constraint force of the elastic ring and moves radially to the second radial position.

[0006] Optionally, the second plate is provided with a plurality of radially extending first strip grooves along the circumferential direction, the first radial position corresponding to the far end of the first strip groove, and the second radial position corresponding to the near end of the first strip groove.

[0007] Optionally, the second plate has a connecting block protruding from its surface. The connecting block has multiple grooves along its circumference, and a tooth is formed between two adjacent grooves. The elastic ring is fitted around the outer periphery of all the teeth.

[0008] Optionally, the first strip groove and the groove are provided in a one-to-one correspondence, and the proximal end of the first strip groove extends to the corresponding groove area.

[0009] Optionally, the second plate is further provided with a limiting ring, which has a plurality of notches corresponding one-to-one with the plurality of first strip grooves. Each notch corresponds to the radial proximal end of the first strip groove, and the elastic ring is located between the limiting ring and the protruding tooth.

[0010] Optionally, the first plate is provided with a plurality of radially extending second strip grooves, the second strip grooves corresponding to the first strip grooves of the second plate, and the two ends of the drive pin are respectively movably disposed in the second strip grooves and the first strip grooves.

[0011] Optionally, the first plate is provided with a polygonal card block, and the second plate is provided with a polygonal card slot that cooperates with the polygonal card block.

[0012] Optionally, the first plate and the second plate are arranged in parallel.

[0013] The beneficial effects of this invention are as follows: It eliminates the complex electrical sensing and locking system, achieving overload protection solely through the mechanical cooperation of the drive pin, the first plate of the elastic ring, and the second plate. When a jamming or overload occurs, the drive pin directly contracts radially in a linear fashion due to resistance. Its force direction is consistent with its movement direction, with no intermediate conversion link, resulting in an extremely rapid and direct response. This effectively avoids rigid impacts with the striking pin teeth, protecting the core transmission components. After the jamming disappears, the drive pin automatically resets to its normal working position under the elastic restoring force of the elastic ring, requiring no manual operation or waiting for a system response. This significantly improves the continuity of use and work efficiency, greatly reduces the number of parts, simplifies the structure, and significantly lowers material and manufacturing costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the drive wheel structure proposed in an embodiment of the present invention;

[0015] Figure 2 This is an exploded view of the drive wheel proposed in an embodiment of this utility model;

[0016] Figure 3 This is a schematic diagram of the second plate of the drive wheel according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the first plate of the drive wheel proposed in an embodiment of the present invention.

[0018] The markings in the attached figures are as follows: 1. First plate; 11. Second strip groove; 12. Polygonal locking block; 2. Second plate; 21. First strip groove; 211. First radial position; 212. Second radial position; 22. Polygonal locking groove; 3. Drive pin; 4. Elastic ring; 5. Connecting block; 51. Groove; 52. Protruding tooth; 6. Limiting ring; 61. Notch; 7. Screw. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 4As shown, this embodiment discloses a drive wheel, including a first plate 1 and a second plate 2. Multiple drive pins 3 are movably connected at both ends to the first plate 1 and the second plate 2, allowing the drive pins 3 to move radially relative to the two plates. An elastic ring 4 is an annular elastic element that provides a continuous, radially outward constraint force to all drive pins 3. During normal operation, the drive pins 3 are in a radially outward position (first radial position 211) under the constraint of the elastic ring 4, reliably driving the striker. When an overload occurs, such as a jamming, the radial resistance on the drive pins 3 increases, overcoming the constraint force of the elastic ring 4, and the entire drive pin moves towards the center to a radially inward position (second radial position 212), thereby avoiding a rigid collision with the striker and protecting the drive pins 3 and the jamming teeth on the striker.

[0021] On the second plate 2, multiple radially extending first strip grooves 21 are uniformly formed along its circumference. These first strip grooves 21 provide a precise track and limit for the movement of the drive pin 3. The first radial position 211 is when the drive pin 3 is located at the far end of the first strip groove 21, at which point the drive pin 3 extends to its maximum length, and the transmission is most reliable. The second radial position 212 is when the drive pin 3 is located at the near end of the first strip groove 21, at which point the drive pin 3 achieves maximum retraction and avoidance. The structure of the first strip groove 21 makes the movement of the drive pin 3 linear, with rapid response and no oscillation uncertainty.

[0022] A connecting block 5 is formed by protrusion on the surface of the second plate 2. Multiple circumferentially distributed grooves 51 are machined into the outer peripheral wall of the connecting block 5. The portion between two adjacent grooves 51 naturally forms protruding teeth 52. An elastic ring 4 is directly fitted around the outer periphery of all the protruding teeth 52. Through the structure of the protruding teeth 52, the circumferential clamping force of the elastic ring 4 is effectively converted into a radially outward thrust acting on the drive pin 3. This structure is simple, easy to assemble, and eliminates the complex structure of individually setting elastic elements for each drive pin 3. The first strip groove 21 corresponds one-to-one with the grooves 51 in both number and position. Furthermore, the proximal end of the first strip groove 21 extends directly and connects to the area of ​​the corresponding groove 51, ensuring that the drive pin 3 has sufficient clearance during overload and can smoothly switch from the first radial position 211 to the second radial position 212.

[0023] The second plate 2 is also provided with an annular limiting ring 6. The limiting ring 6 has notches 61 that correspond one-to-one with each of the first strip grooves 21. Each notch 61 is exactly aligned with the radial proximal end of the corresponding first strip groove 21. The elastic ring 4 is accommodated in the annular space between the inner wall of the limiting ring 6 and the outer peripheral surface of the protrusion 52. The limiting ring 6 forms a reliable limiting and protective structure for the elastic ring 4 from the radial outside, ensuring that the elastic ring 4 is always in the correct working position. The notches 61 on it provide a channel for the drive pin 3 to move from the strip groove to the groove 51 area.

[0024] The first plate 1 also has multiple radially extending second strip grooves 11. The position, shape, and number of these second strip grooves 11 completely correspond to the first strip grooves 21 on the second plate 2. The two ends of the drive pin 3 are respectively embedded in the second strip grooves 11 of the first plate 1 and the first strip grooves 21 of the second plate 2. The first strip grooves 21 and the second strip grooves 11 simultaneously guide and support the two ends of the drive pin 3, making the radial movement of the drive pin 3 more stable and preventing deflection or jamming. It also improves the overall mechanical strength of the drive wheel. The first plate 1 may also have connecting blocks 5, limiting rings 6, and other structures corresponding to the second plate 2.

[0025] A polygonal locking block 12 is located at the center of the first plate 1, and a polygonal locking groove 22 with a matching shape is located at the center of the second plate 2. The assembly of the polygonal locking block 12 and the polygonal locking groove 22 provides strong torque transmission capability, prevents slippage between the two plates, ensures the synchronization of all drive pins 3, and makes power transmission smoother and more reliable. The first plate 1 and the second plate 2 are set in parallel relative to each other. After the polygonal locking block 12 and the polygonal locking groove 22 are aligned, they are usually fastened together with screws 7 to form a rigid rotor assembly. During assembly, the drive pin 3 is placed into the first slot 21 of the second plate 2, the elastic ring 4 is put on, and then the first plate 1 is covered, so that the other end of the drive pin 3 enters the second slot 11, and finally it is locked with screws 7. During operation, the motor drives the drive wheel to rotate through the reduction mechanism. Under normal conditions, the drive pin 3 is located at the far end of the slot under the action of the elastic ring 4, and engages the striking pin locking teeth. When overloaded, the drive pin 3 is compressed, overcoming the force of the elastic ring 4 and moving towards the center to the near end of the strip groove and the groove 51 area, thus avoiding overload. After the overload disappears, it automatically resets under the action of the elastic ring 4. This drive wheel structure integrates the overload protection function into the drive wheel itself, resulting in a simple structure, fewer parts, high reliability, and low cost, effectively solving the problem of nail jamming and damage in electric nail guns.

[0026] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. A drive wheel, characterized in that, It includes a first plate, a second plate, a drive pin, and an elastic ring that provides radial constraint for the drive pin. One end of the drive pin is movably connected to the first plate, and the other end of the drive pin is movably connected to the second plate. The second plate has a first radial position and a second radial position. During normal driving, the drive pin is constrained by the elastic ring and is located in the first radial position. When the drive pin is subjected to radial resistance exceeding a threshold, the drive pin overcomes the constraint force of the elastic ring and moves radially to the second radial position.

2. The drive wheel according to claim 1, characterized in that, The second plate is provided with a plurality of radially extending first strip grooves along the circumference, the first radial position corresponding to the far end of the first strip groove, and the second radial position corresponding to the near end of the first strip groove.

3. The drive wheel according to claim 2, characterized in that, The second plate has a connecting block protruding from its surface. The connecting block has multiple grooves along its circumference, and a tooth is formed between two adjacent grooves. The elastic ring is fitted around the outer periphery of all the teeth.

4. The drive wheel according to claim 3, characterized in that, The first strip groove and the groove are provided in a one-to-one correspondence, and the proximal end of the first strip groove extends to the corresponding groove.

5. The drive wheel according to claim 3, characterized in that, The second plate is also provided with a limiting ring, which has a plurality of notches corresponding one-to-one with the plurality of first strip grooves. Each notch corresponds to the radial proximal end of the first strip groove, and the elastic ring is located between the limiting ring and the protruding tooth.

6. The drive wheel according to claim 2, characterized in that, The first plate is provided with a plurality of radially extending second strip grooves, the second strip grooves corresponding to the first strip grooves of the second plate, and the two ends of the drive pin are respectively movably disposed in the second strip grooves and the first strip grooves.

7. The drive wheel according to claim 1, characterized in that, The first plate is provided with polygonal card blocks, and the second plate is provided with polygonal card slots that cooperate with the polygonal card blocks.

8. The drive wheel according to claim 1, characterized in that, The first plate and the second plate are arranged in parallel.

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