A quick pin for workpiece hole positioning and clamping

Abstract

The utility model relates to the technical field of clamping pin, and disclose a kind of quick pin for workpiece hole positioning and clamping, comprising: pin shaft pipe;Self-locking handle;Cam portion;Movable pin, for adjusting the distance between cam portion and workpiece;Waist type slider, be equipped in movable pin one end, for when waist type slider vertical, pass through workpiece hole, when waist type slider transverse, it can prevent movable pin reset.The utility model is through the linkage structure of waist type slider and self-locking handle, realized the quick positioning and clamping integration operation of workpiece hole, positioning pin and clamping element are integrated into one, operator only needs to be placed vertically and enter workpiece hole after waist type slider, again, press down self-locking handle can be simultaneously completed radial positioning and axial clamping, without additional bolt, nut or C-shaped clamp, significantly simplify assembly process, shorten operating time, especially applicable to the scene of batch production or frequent disassembly and assembly, greatly improve production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of clamping pin technology, and specifically relates to a quick-release pin for positioning and clamping workpiece holes. Background Technology

[0002] In existing workpiece hole positioning and clamping technologies, especially for assembly scenarios involving workpieces with through-hole structures such as flanges and plates, a combination of split locating pins and independent clamping elements is typically used. The operator first inserts the cylindrical locating pin into the workpiece hole to achieve radial positioning, and then uses bolts, nuts, or C-clamps to apply axial clamping force, bringing multiple workpieces together.

[0003] However, traditional locating pins can only restrict the radial displacement of the workpiece and cannot provide axial clamping force, so an additional independent clamping element must be provided. During the assembly process, the operator must first complete the pin positioning, and then use tools such as wrenches and sockets to tighten the bolts one by one or operate the clamps. The process is cumbersome and time-consuming, which seriously restricts production efficiency, especially for mass production or scenarios that require frequent disassembly and assembly.

[0004] Meanwhile, the bolt tightening method is sensitive to the amount of preload. If the tightening torque is insufficient, the workpiece is prone to loosening after vibration or stress; if the torque is too large, it may damage the workpiece surface or threads, and disassembly will also be difficult.

[0005] Furthermore, while existing quick-clamping devices such as eccentric wheel clamps can achieve a certain degree of rapid operation, they are typically mounted on a fixed base and cannot simultaneously function as locating pins. If both pin-based positioning and quick clamping are required simultaneously, operators often need to operate two separate mechanisms, increasing not only the number of tooling components and costs but also extending auxiliary time due to the multiple steps. This is especially problematic in situations requiring repeated assembly and disassembly, such as workpiece inspection, rework, trial assembly, or process flow. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a quick-release pin for positioning and clamping workpiece holes.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a quick-release pin for positioning and clamping workpiece holes, comprising: a pin tube for passing through the workpiece hole; a self-locking handle, Y-shaped and rotatably connected to the circumference of the pin tube; a cam portion, located at both ends of the Y-shaped self-locking handle, for pressing the workpiece surface to form pressure fixation; a moving pin, located at one end of the pin tube and adjustable in distance from the pin tube, for adjusting the distance between the cam portion and the workpiece; and a waist-shaped slider, located at one end of the moving pin, for passing through the workpiece hole when the waist-shaped slider is vertical, and preventing the moving pin from resetting when the waist-shaped slider is horizontal.

[0008] Preferably, the inner wall of the pin tube is provided with a T-shaped shaft, both ends of which are rotatably connected to both ends of the self-locking handle, so that the self-locking handle and the pin tube can rotate relative to each other; one end of the moving pin is snapped with a rotating shaft, the circumferential surface of which is sleeved with the inner circumferential surface of the waist-shaped slider, so that the waist-shaped slider can change direction relative to the moving pin.

[0009] Preferably, the pin tube has a vertical sliding opening on its circumference that communicates with the central hole of the pin tube, and the T-shaped shaft is movably disposed in the vertical sliding opening on the pin tube. The horizontal section of the T-shaped shaft can move up and down along the vertical sliding opening, and the vertical section of the T-shaped shaft is slidably embedded in the central hole of the pin tube.

[0010] Preferably, an auxiliary spring is snapped onto one end of the T-shaped shaft to ensure that the cam portion fits tightly against the workpiece after the self-locking handle rotates and the T-shaped shaft moves upward; a mounting screw is attached to one end of the auxiliary spring, and the mounting screw is threaded to the inner wall of the other end of the pin tube for workers to adjust or replace the auxiliary spring.

[0011] Preferably, one end of the pin tube has a threaded groove, and the inner wall of the threaded groove is threaded with a threaded post. One end of the threaded post is snapped into the moving pin and is used to adjust the distance between the pin tube and the moving pin by rotation.

[0012] Preferably, one end of the threaded cylinder groove is set as a tapered end to improve the strength of the threaded cylinder groove end and prevent the threaded cylinder groove from deforming due to the T-shaped shaft squeezing the inner wall of the pin tube when the auxiliary spring is not compressed.

[0013] Preferably, one end of the T-shaped shaft is snapped with a large-diameter end, and the other end of the T-shaped shaft is inserted with a blocking end, which is used to limit the position of the two ends of the self-locking handle and prevent the self-locking handle from disengaging from the T-shaped shaft.

[0014] Preferably, the cam portion has anti-slip grooves arranged in a circumferential array, with the grooves facing the self-locking handle to prevent the self-locking handle from reversing.

[0015] Preferably, one end of the self-locking handle is symmetrically glued with rubber pads to provide anti-slip and cushioning for the worker's palm.

[0016] In summary, this utility model has the following beneficial effects:

[0017] 1. This utility model achieves integrated operation of rapid positioning and clamping of workpiece holes through the linkage structure of waist-shaped slider and self-locking handle. The positioning pin and clamping element are integrated into one unit. The operator only needs to place the waist-shaped slider vertically into the workpiece hole and then flatten it, and then press down the self-locking handle to complete radial positioning and axial clamping at the same time. There is no need to equip it with bolts, nuts or C-shaped clamps, which significantly simplifies the assembly process and shortens the operation time. It is especially suitable for batch production or frequent disassembly and assembly scenarios, and greatly improves production efficiency.

[0018] 2. This utility model achieves adaptive clamping of workpieces of different thicknesses through the adjustable distance structure between the moving pin and the pin tube. When the workpiece thickness changes, the operator only needs to rotate the moving pin to adjust the extension length of the pin tube, so that the cam part can always be closely fitted with the workpiece surface after the self-locking handle is pressed down, generating sufficient clamping force. This allows the same quick-release pin to be used for workpieces of various thicknesses without the need to replace positioning pins of different specifications, thus improving the versatility and flexibility of the tooling.

[0019] 3. This utility model achieves self-locking and anti-loosening in the clamping state through the cooperation structure of the anti-slip groove of the cam part and the auxiliary spring. When the self-locking handle is pressed down to the clamping position, the elastic force of the auxiliary spring pushes the T-shaped shaft and the cam part to continuously press the workpiece surface, while the friction between the anti-slip groove and the workpiece surface further prevents the cam part from rotating in the opposite direction due to vibration or external force, forming a double anti-loosening mechanism. This effectively avoids the loosening problem caused by vibration in traditional bolt fastening, ensuring the clamping reliability of the workpiece during processing or transportation. At the same time, it eliminates the need for frequent inspection or retightening, reducing the labor intensity of operators.

[0020] 4. This utility model can also be modified by changing the pin tube and moving pin to adapt to clamping and positioning operations with different hole diameters, thereby increasing the applicability of the equipment and the applicable equipment, and reducing the required production cost and the complexity of the device. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the self-locking handle of this utility model;

[0023] Figure 3 This is an exploded view of the pin shaft tube of this utility model;

[0024] Figure 4 This is an exploded view of the threaded column of this utility model;

[0025] Figure 5 This is a T-shaped sectional view of the present invention;

[0026] Figure 6This is a schematic diagram of the cam part of this utility model.

[0027] Figure label:

[0028] 1. Self-locking handle; 101. Cam part; 102. Moving pin; 103. Waist-shaped slider;

[0029] 2. Pin tube; 201. T-shaped shaft; 202. Rotary shaft component;

[0030] 3. Vertical sliding opening; 301. Auxiliary spring;

[0031] 4. Install the screws;

[0032] 5. Threaded column; 501. Threaded cylinder groove;

[0033] 6. Conical end;

[0034] 7. Large diameter end; 701. Stopping end;

[0035] 8. Anti-slip grooves;

[0036] 9. Rubber pad. Detailed Implementation

[0037] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0038] The specific embodiments of this utility model are described below with reference to the accompanying drawings: Example

[0039] refer to Figures 1-6 A quick-release pin for positioning and clamping workpiece holes includes: a pin tube 2 for passing through the workpiece hole; a self-locking handle 1, which is Y-shaped and rotatably connected to the circumference of the pin tube 2; a cam portion 101, located at both ends of the Y-shaped self-locking handle 1, for pressing the workpiece surface to form pressure fixation; a moving pin 102, located at one end of the pin tube 2 and adjustable in distance from the pin tube 2, for adjusting the distance between the cam portion 101 and the workpiece, thereby adjusting the clamping size so that the product can adapt to workpieces of different sizes and thicknesses; and a waist-shaped slider 103, located at one end of the moving pin 102, for passing through the workpiece hole when the waist-shaped slider 103 is vertical, and preventing the moving pin 102 from resetting when the waist-shaped slider 103 is horizontal.

[0040] Specifically, the operator only needs to vertically pass the waist-shaped slider 103 through the workpiece hole and rotate it to the horizontal position to prevent reset, and then press down the self-locking handle 1 to make the cam part 101 press against the workpiece surface, so that radial positioning and axial clamping can be completed at the same time. The positioning pin and clamping element are integrated into one piece, eliminating the need for additional bolts, nuts or C-shaped clamps, which significantly simplifies the assembly process and shortens the operation time. It is especially suitable for mass production or frequent disassembly and assembly scenarios, and greatly improves production efficiency.

[0041] The inner wall of the pin tube 2 is provided with a T-shaped shaft 201. Both ends of the T-shaped shaft 201 are rotatably connected to both ends of the self-locking handle 1, so that the self-locking handle 1 and the pin tube 2 can rotate relative to each other.

[0042] One end of the moving pin 102 is snapped with a rotating shaft 202. The circumferential surface of the rotating shaft 202 is fitted with the inner circumferential surface of the waist-shaped slider 103, so that the waist-shaped slider 103 can change direction relative to the moving pin 102.

[0043] Specifically, the T-shaped shaft 201 provides a stable rotation axis for the self-locking handle 1, ensuring that the self-locking handle 1 does not deviate or jam during frequent use;

[0044] The fitting of the rotating shaft 202 and the waist-shaped slider 103 allows the waist-shaped slider 103 to switch quickly between vertical and horizontal directions, and the positioning is accurate after switching, avoiding misoperation caused by unclear direction and improving the reliability of the device.

[0045] The pin tube 2 has a vertical sliding opening 3 on its circumference that communicates with the center hole of the pin tube 2. The T-shaped shaft 201 is movably disposed in the vertical sliding opening 3 on the pin tube 2. The horizontal section of the T-shaped shaft 201 can move up and down along the vertical sliding opening 3, and the vertical section of the T-shaped shaft 201 is slidably embedded in the center hole of the pin tube 2.

[0046] Specifically, through the linear guiding effect of the vertical sliding opening 3, it is ensured that the T-shaped shaft 201 moves only along the axial direction under the push of the auxiliary spring 301 without circumferential deflection. This ensures that the cam part 101 always presses the workpiece surface at the correct angle during the pressing of the self-locking handle 1, avoiding the deviation of the clamping force direction or the failure of self-locking caused by the rotation of the T-shaped shaft 201.

[0047] One end of the T-shaped shaft 201 is fitted with an auxiliary spring 301, which is used to make the cam part 101 fit tightly against the workpiece after the self-locking handle 1 is rotated and the T-shaped shaft 201 moves upward.

[0048] One end of the auxiliary spring 301 is fitted with a mounting screw 4, which is threaded to the inner wall of the other end of the pin tube 2, and is used by the staff to adjust or replace the auxiliary spring 301.

[0049] Specifically, the spring force of the auxiliary spring 301 pushes the T-shaped shaft 201 and the cam part 101 to continuously press the workpiece surface, forming a stable clamping force;

[0050] The detachable design of mounting screw 4 allows operators to replace springs with different elastic forces or perform maintenance without disassembling the overall structure, adapting to the clamping force requirements of different workpieces and extending the service life of the device.

[0051] One end of the pin tube 2 is provided with a threaded groove 501. A threaded post 5 is threadedly connected to the inner wall of the threaded groove 501. One end of the threaded post 5 is snapped into the moving pin 102 and is used to adjust the distance between the pin tube 2 and the moving pin 102 by rotation.

[0052] Specifically, the operator only needs to rotate the moving pin 102 to adjust the extension length of the pin tube 2, thereby changing the relative position between the cam part 101 and the workpiece. This allows the same quick-release pin to be used for workpieces of different thicknesses without the need to replace the positioning pins of different specifications, thus improving the versatility and flexibility of the tooling.

[0053] One end of the threaded cylinder groove 501 is set as a tapered end 6 to improve the end strength of the threaded cylinder groove 501 and prevent the threaded cylinder groove 501 from deforming when the auxiliary spring 301 is not compressed and the T-shaped shaft 201 squeezes the inner wall of the pin tube 2.

[0054] Specifically, the gradually expanding shape of the conical end 6 disperses the local stress when the end of the T-shaped shaft 201 contacts the inner wall of the pin tube 2, avoiding cracking or deformation of the end of the threaded cylinder groove 501 due to stress concentration, ensuring the fitting accuracy between the threaded column 5 and the threaded cylinder groove 501, and improving the mechanical durability of the device.

[0055] One end of the T-shaped shaft 201 is snapped with a large-diameter end 7, and the other end of the T-shaped shaft 201 is plugged with a stop end 701, which is used to limit the position of the two ends of the self-locking handle 1 and prevent the self-locking handle 1 from disengaging from the T-shaped shaft 201.

[0056] Specifically, the large-diameter end 7 and the blocking end 701 form an axial limit on both ends of the self-locking handle 1, preventing the self-locking handle 1 from slipping off both ends of the T-shaped shaft 201 when it is repeatedly rotated or subjected to accidental pulling force, while allowing the self-locking handle 1 to rotate freely, which not only ensures the smoothness of operation, but also avoids failure or safety accidents caused by the separation of parts.

[0057] The cam portion 101 has anti-slip grooves 8 arranged in a circumferential array on its circumferential surface. The anti-slip grooves 8 are oriented towards the self-locking handle 1 to prevent the self-locking handle 1 from reversing.

[0058] Specifically, when the self-locking handle 1 is pressed down to the clamping position, the anti-slip groove 8 forms a one-way frictional resistance with the workpiece surface. When the self-locking handle 1 has a tendency to reverse, the edge of the anti-slip groove 8 embeds into the workpiece surface to generate greater resistance, effectively preventing the cam part 101 from rotating in the opposite direction due to vibration or external force, thus forming a reliable anti-loosening mechanism. This avoids the loosening problem caused by vibration in traditional bolt fastening and ensures the clamping reliability of the workpiece during processing or transportation.

[0059] One end of the self-locking handle 1 is symmetrically glued with rubber pads 9 to provide anti-slip and cushioning for the worker's palm.

[0060] Specifically, when the operator presses down or lifts the self-locking handle 1, the rubber pad 9 increases the friction between the palm and the handle to prevent slippage caused by hand sweat or oil.

[0061] Meanwhile, the elastic material of the rubber pad 9 absorbs the impact force at the moment of pressing down, reducing the pressure on the palm and improving operating comfort. It is especially suitable for mass production scenarios that require frequent assembly and disassembly, reducing operator fatigue. Example

[0062] refer to Figures 1-6 The staff used the technology disclosed in this application on the engine cylinder head processing line of an auto parts manufacturing plant;

[0063] To meet the mass production demand of 100,000 cylinder heads per year, operators need to quickly clamp and disassemble the positioning holes on the cylinder heads.

[0064] In the traditional process, workers need to first insert the cylindrical pin into the hole for positioning, and then use a wrench to tighten the M10 bolt to apply axial clamping force. The clamping time for a single piece is about thirty seconds, and frequent tightening can easily lead to thread wear.

[0065] To address this, the workshop introduced a quick-release pin for workpiece hole positioning and clamping. The pin shaft tube 2 is made of 40Cr alloy steel, heat-treated, with a diameter of 12 mm and a length of 40 mm, and is hard chrome plated. One end of the pin shaft tube 2 is machined with an M8 internal thread of 20 mm depth as a threaded groove 501. The bottom of the threaded groove 501 has a tapered end 6 with a taper angle of 60 degrees to distribute stress.

[0066] A threaded post 5, also made of 40Cr material, is threaded into a threaded groove 501. A moving pin 102 is fixedly engaged at the end of the threaded post 5. The moving pin 102 is cylindrical, with a diameter of 10 mm and a length of 15 mm. An oblong slider 103 is fitted onto the end of the moving pin 102 via a rotating shaft 202. The oblong slider 103 is elliptical in shape, with a major axis of 12 mm, a minor axis of 8 mm, and a thickness of 5 mm. It is made of quenched and tempered 40Cr alloy steel and can rotate 90 degrees around the rotating shaft 202.

[0067] A vertical sliding opening 3, 7 mm wide and 25 mm long, is opened in the center of the pin tube 2 along the axial direction. A T-shaped shaft 201 is slidably fitted inside the vertical sliding opening 3. The horizontal crossbar of the T-shaped shaft 201 has a diameter of 6 mm, and Y-shaped forks of the self-locking handle 1 extend from both ends. They are locked by the large-diameter end 7 and the stop end 701 to prevent them from coming out.

[0068] The self-locking handle 1 is also made of 40Cr alloy steel with a heat treatment process. It is 80 mm long, with a Y-shaped fork arm width of 35 mm. Each end has a cam part 101 with an Archimedean spiral profile. The base circle radius is 8 mm, and the lift is 2.5 mm. Its circumferential surface has six anti-slip grooves 8 with a depth of 0.3 mm, and the grooves point towards the gripping end of the self-locking handle 1. A piano wire auxiliary spring 301 is fitted on the vertical rod of the T-shaped shaft 201. The wire diameter is 1.2 mm, the outer diameter is 9 mm, and the free length is 28 mm. The lower end of the spring is supported by a mounting screw 4 screwed into the tail of the pin tube 2. The gripping end of the self-locking handle 1 is symmetrically pasted with 3 mm thick nitrile rubber pads 9, and the surface is provided with diamond-shaped anti-slip texture.

[0069] Before machining a batch of cast iron cylinder heads, the cylinder heads are 35 mm thick, with a 12 mm diameter through hole pre-drilled on their side. The operator first adjusts the axial length of the quick-release pin according to the cylinder head thickness, rotating the moving pin 102 to screw the threaded post 5 into or out of the threaded groove 501 until the distance between the end face of the pin tube 2 and the bottom surface of the waist-shaped slider 103 is approximately 2 mm greater than the cylinder head thickness. Then, the waist-shaped slider 103 is rotated around the rotating shaft 202 to a vertical position, aligning its short axis (8 mm) with the cylinder head through hole. The pin tube 2, along with the waist-shaped slider 103, is then passed through the cylinder head through hole until the waist-shaped slider 103 is completely exposed on the other side of the cylinder head.

[0070] Next, the operator uses their finger to rotate the waist-shaped slider 103 90 degrees to a horizontal position. At this point, the long axis of the waist-shaped slider 103, 12 mm long, is perpendicular to the direction of the through hole and cannot retract from the 12 mm diameter hole, thus forming a preliminary axial stop. Then, the operator grasps the rubber pad 9 of the self-locking handle 1 and presses it downwards. The self-locking handle 1 rotates around the T-shaped shaft 201, and the cam portion 101 at the Y-shaped fork arm gradually contacts the cylinder head surface. When the handle rotates downwards approximately 45 degrees from its vertically raised position, the distal end of the cam portion 101 begins to press against the cylinder head surface, while the T-shaped shaft 201 slides upwards along the vertical sliding opening 3, compressing the auxiliary spring 301. As the handle continues to be pressed down to the horizontal position, the cam portion 101 reaches its maximum lift, generating an axial clamping force of approximately 500 Newtons on the cylinder head surface; the compressed auxiliary spring 301 applies a continuous thrust of approximately 80 Newtons to the T-shaped shaft 201, ensuring that the cam portion 101 remains in contact with the cylinder head. The anti-slip groove 8 is embedded in the cast iron surface of the cylinder head to prevent the cam section 101 from rotating in the opposite direction due to vibration. The entire pressing process takes only two seconds to complete the clamping.

[0071] During subsequent milling, the quick-release pin withstood a cutting load of 3,000 rpm and a feed rate of 0.1 mm / s without any workpiece displacement or loosening. After machining, the operator lifts the self-locking handle 1 upwards, disengaging the cam 101 from the cylinder head surface. Then, the waist-shaped slider 103 is rotated back to the vertical position, allowing the quick-release pin to be easily removed. Field statistics show that using this quick-release pin reduces single-piece clamping time from 30 seconds to 5 seconds, saving approximately 700 hours of labor annually. Furthermore, because no bolt tightening is required, it completely eliminates thread stripping and workpiece surface indentation problems, significantly improving production line cycle time and product quality consistency. This quick-release pin is also suitable for quick positioning and clamping of various perforated workpieces such as cylinder heads, connecting rods, and flanges, demonstrating its high versatility.

[0072] The working principle of this utility model:

[0073] Quick-release pins are mainly composed of the following components:

[0074] Pin tube 2 is used to pass through the workpiece hole and serves as a radial positioning function.

[0075] The self-locking handle 1 is Y-shaped, with cam portions 101 at both ends for pressing the surface of the workpiece. The self-locking handle 1 is rotatably connected to the pin tube 2 via a T-shaped shaft 201. The T-shaped shaft 201 can slide axially within the vertical sliding opening 3 on the surface of the pin tube 2, but cannot rotate.

[0076] The moving pin 102 is located at one end of the pin tube 2 and is connected to the threaded groove 501 inside the pin tube 2 through the threaded post 5, and its extension length can be adjusted by rotation.

[0077] The waist-shaped slider 103 is rotatably connected to one end of the moving pin 102 via the rotating shaft 202, and can switch between vertical and horizontal directions.

[0078] The auxiliary spring 301 is fitted onto the T-shaped shaft 201, with one end abutting against the T-shaped shaft 201 and the other end abutting against the mounting screw 4, providing axial elastic force.

[0079] Step 1: In the initial state, without clamping, the self-locking handle 1 is in the raised position, the cam part 101 is away from the pin tube 2; the waist-shaped slider 103 is in the horizontal or vertical state; the auxiliary spring 301 is in the free or slightly compressed state.

[0080] Step Two: Based on the thickness of the workpiece to be clamped, the operator pre-adjusts the extension length of the moving pin 102 by rotating it. Rotating the moving pin 102 causes the threaded post 5 to rotate within the threaded groove 501, thereby changing the axial distance between the moving pin 102 and the pin tube 2, ensuring the total length of the quick-release pin matches the workpiece thickness. After adjustment, the waist-shaped slider 103 is rotated to a vertical position, with its narrow side facing the workpiece hole. Then, the pin tube 2 and the waist-shaped slider 103 are passed sequentially through the through hole of the workpiece until the waist-shaped slider 103 is fully exposed on the other side of the workpiece.

[0081] Step 3: After the waist-shaped slider 103 passes through the workpiece hole, the operator rotates it 90 degrees around the rotating shaft 202 to bring it into a horizontal position. At this time, the length direction of the waist-shaped slider 103 is perpendicular to the long side of the workpiece hole, and its width is greater than the diameter of the workpiece hole. Therefore, it cannot retract from the workpiece hole, thus preventing the moving pin 102 and the entire quick-release pin from being accidentally pulled out before clamping, and playing a preliminary axial positioning role.

[0082] Step 4: The operator holds the handle of the self-locking handle 1 and presses it downwards. Since the self-locking handle 1 is connected to the pin tube 2 via the T-shaped shaft 201, and the T-shaped shaft 201 can slide axially in the vertical sliding opening 3.

[0083] When the self-locking handle 1 is pressed down to a near-horizontal position, the distal end of the cam portion 101 begins to contact the workpiece surface. Its Y-shaped fork end drives the T-shaped shaft 201 to slide upward in the vertical sliding opening 3, compressing the auxiliary spring 301. Due to the eccentric effect of the cam profile, as the handle is pressed down further, the cam portion 101 generates a gradually increasing positive pressure on the workpiece. At the same time, the compressed auxiliary spring 301 applies a downward thrust to the T-shaped shaft 201, causing the cam portion 101 to continuously press against the workpiece surface, forming a stable axial clamping force.

[0084] Step 5: When the self-locking handle 1 is fully pressed down to the horizontal or slightly below horizontal position, the mechanism enters the self-locking state;

[0085] The profile design of the cam section 101 ensures that, in the clamping position, the reaction force of the workpiece on the cam passes through the cam rotation center and does not generate a torque component that would cause the handle to reverse, thereby achieving geometric self-locking.

[0086] The cam portion 101 has anti-slip grooves 8 arranged in a circumferential array on its circumferential surface, with the grooves facing the self-locking handle 1. When the cam presses against the workpiece, the edge of the anti-slip groove 8 embeds into the workpiece surface, generating unidirectional frictional resistance, which further prevents the self-locking handle 1 from rotating in the opposite direction due to vibration or external force.

[0087] The spring force of the auxiliary spring 301 always pushes the T-shaped shaft 201 and the cam part 101 to press against the workpiece. Even if there is slight wear on the cam surface or thermal expansion and contraction of the workpiece, the spring can automatically compensate and maintain a constant clamping force.

[0088] Step Six: When it is necessary to disassemble the workpiece, the operator lifts the self-locking handle 1 upwards. First, the spring force of the auxiliary spring 301 and the friction between the cam and the workpiece are overcome, causing the cam part 101 to disengage from the workpiece surface. Then, the waist-shaped slider 103 is rotated back to the vertical direction. At this time, the waist-shaped slider 103 can freely pass through the workpiece hole. Finally, the entire quick pin is pulled out of the workpiece hole, completing the disassembly.

[0089] Step 7: For workpieces of different thicknesses, the operator only needs to rotate the moving pin 102 before first use. Rotating the moving pin 102 causes the threaded post 5 to screw into or out of the threaded cylinder groove 501, thereby changing the total length between the pin tube 2 and the moving pin 102, ensuring that when the self-locking handle 1 is pressed down to the horizontal position, the cam part 101 can just press against the workpiece surface. The design of the tapered end 6 improves the strength of the end of the threaded cylinder groove 501 and prevents deformation caused by the extrusion of the end of the T-shaped shaft 201.

[0090] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0091] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A quick-release pin for positioning and clamping workpiece holes, characterized in that, include: Pin tube (2), used to pass through the workpiece hole; The self-locking handle (1) is Y-shaped and rotatably connected to the circumferential surface of the pin tube (2); The cam portion (101) is located at both ends of the Y-shaped self-locking handle (1) and is used to press the surface of the workpiece to form pressure fixation. A movable pin (102) is provided at one end of the pin tube (2) and the distance between it and the pin tube (2) can be adjusted for adjusting the clamping size; The waist-shaped slider (103) is located at one end of the moving pin (102). When the waist-shaped slider (103) is vertical, it can pass through the workpiece hole. When the waist-shaped slider (103) is horizontal, it can prevent the moving pin (102) from resetting and leaving the workpiece hole.

2. A quick-release pin for positioning and clamping workpiece holes according to claim 1, characterized in that: The inner wall of the pin tube (2) is provided with a T-shaped shaft (201), and both ends of the T-shaped shaft (201) are rotatably connected to both ends of the self-locking handle (1) to enable the self-locking handle (1) and the pin tube (2) to rotate relative to each other; One end of the moving pin (102) is fitted with a rotating shaft (202), and the circumferential surface of the rotating shaft (202) is sleeved with the inner circumferential surface of the waist-shaped slider (103) to allow the waist-shaped slider (103) to change direction relative to the moving pin (102).

3. A quick-release pin for positioning and clamping workpiece holes according to claim 2, characterized in that: The pin tube (2) has a vertical sliding opening (3) that communicates with the central hole of the pin tube (2) on its circumference. The T-shaped shaft (201) is movably disposed in the vertical sliding opening (3) on the pin tube (2). The horizontal section of the T-shaped shaft (201) can move up and down along the vertical sliding opening (3), and the vertical section of the T-shaped shaft (201) is slidably embedded in the central hole of the pin tube (2).

4. A quick-release pin for positioning and clamping workpiece holes according to claim 3, characterized in that: An auxiliary spring (301) is snapped onto one end of the T-shaped shaft (201) to ensure that the cam part (101) fits tightly against the workpiece and prevents wear of the cam part (101) after the self-locking handle (1) rotates and the T-shaped shaft (201) moves upward. The auxiliary spring (301) has a mounting screw (4) attached to one end, and the mounting screw (4) is threaded to the inner wall of the other end of the pin tube (2) to facilitate the worker to adjust or replace the auxiliary spring (301).

5. A quick-release pin for positioning and clamping workpiece holes according to claim 2, characterized in that: One end of the pin tube (2) is provided with a threaded cylindrical groove (501), and a threaded column (5) is threadedly connected to the inner wall of the threaded cylindrical groove (501). One end of the threaded column (5) is snapped into the moving pin (102) and is used to adjust the distance between the pin tube (2) and the moving pin (102) by rotation.

6. A quick-release pin for positioning and clamping workpiece holes according to claim 5, characterized in that: One end of the threaded cylinder groove (501) is set as a tapered end (6) to improve the end strength of the threaded cylinder groove (501) and prevent the auxiliary spring (301) from deforming the threaded cylinder groove (501) by squeezing the inner wall of the pin tube (2) when the T-shaped shaft (201) is not compressed.

7. A quick-release pin for positioning and clamping workpiece holes according to claim 2, characterized in that: One end of the T-shaped shaft (201) is snapped with a large-diameter end (7), and the other end of the T-shaped shaft (201) is plugged with a stop end (701) to limit the position of the two ends of the self-locking handle (1) and prevent the self-locking handle (1) from disengaging from the T-shaped shaft (201).

8. A quick-release pin for positioning and clamping workpiece holes according to claim 1, characterized in that: The cam part (101) has anti-slip grooves (8) arranged in a circumferential array on its circumferential surface. The anti-slip grooves (8) are grooved in the direction of the self-locking handle (1) to prevent the self-locking handle (1) from reversing.

9. A quick-release pin for positioning and clamping workpiece holes according to claim 1, characterized in that: The self-locking handle (1) has a rubber pad (9) symmetrically glued to one end to provide anti-slip and cushioning for the worker's palm.

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