A fastener production and processing positioning device

Abstract

The application provides a fastener production and processing positioning device, and relates to the technical field of fastener production. The fastener production and processing positioning device comprises a machine tool, a fixed seat is fixedly arranged on one side of the upper end of the machine tool, a processing seat is slidably arranged on the other side of the machine tool, the processing seat is connected with a processing mechanism, a driving module is arranged in the machine tool, and is used for driving the fixed seat to rotate and driving the processing seat to slide, and a positioning mechanism is rotatably arranged in the fixed seat and is connected with the driving module. The positioning mechanism comprises a rotating shaft, one end of the rotating shaft is connected with the driving module, the other end of the rotating shaft is fixedly provided with a clamping seat, a plurality of positioning sliding blocks are slidably arranged in the clamping seat in the circumferential direction, a fixed block is fixedly arranged on one side of the positioning sliding block, a connecting block is fixedly arranged on the side surface of the fixed block, and a positioning assembly is arranged at the other end of the connecting block. The positioning strip is self-adaptively attached to increase the contact area, and the force limiting mechanism prevents the centrifugal force from overloading and damaging the workpiece.

Description

Technical Field

[0001] This invention relates to the field of fastener manufacturing technology, specifically to a fastener manufacturing and processing positioning device. Background Technology

[0002] Fasteners are a type of mechanical part used for fastening connections and are widely used in industries such as energy, electronics, electrical appliances, machinery, chemicals, metallurgy, mold making, and hydraulics. In the production and processing of threaded sleeve fasteners, the outer wall needs to be polished, requiring clamping and positioning. When clamping sleeve-type workpieces with internal threads, if the traditional external clamping method is used, the clamping force acts directly on the outer wall of the workpiece, easily causing radial shrinkage of the workpiece as a whole, leading to deformation of the internal threads and affecting thread accuracy. Therefore, some existing technologies have adopted an internal clamping method, positioning the fastener by extending the clamping component into the inner wall of the workpiece.

[0003] Chinese patent CN118752391B employs the aforementioned inner wall clamping concept. This device uses a pusher block and spring linkage to drive a pressure plate into the threaded groove of the inner threaded sleeve, and utilizes the centrifugal force generated during rotation to further press the pressure plate against the inner wall of the workpiece. The drawback of this device is that the contact area between the pressure plate and the threaded groove of the workpiece's inner wall is of a fixed shape, limiting the contact area. As the centrifugal force continuously increases with the rotational speed, the pressure exerted by the pressure plate on the threaded groove continuously increases. For thin-walled workpieces or workpieces made of low-strength materials, this local pressure can easily exceed the material's yield strength, causing irreversible crushing deformation at the edge of the threaded groove, ultimately leading to out-of-tolerance thread accuracy of the inner threaded sleeve and affecting subsequent assembly quality. Summary of the Invention

[0004] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a fastener production and processing positioning device that solves the problems of small contact area and excessive centrifugal force causing workpiece deformation when clamping internal threaded sleeves.

[0005] Technical solution To achieve the above objectives, the present invention provides the following technical solution: a fastener production and processing positioning device, comprising: A machine tool, with a fixed base fixedly mounted on one side of its upper end and a machining base slidably mounted on the other side, the machining base being connected to a machining mechanism; The drive module, located inside the machine tool, is used to drive the fixed seat to rotate and the machining seat to slide. The positioning mechanism is rotatably mounted inside the fixed base and connected to the drive module; The positioning mechanism includes a rotating shaft, one end of which is connected to a drive module, and the other end is fixedly provided with a clamping seat. Multiple positioning sliders are slidably arranged inside the clamping seat along its circumference. A fixing block is fixedly provided on one side of the positioning slider, a connecting block is fixedly provided on the side of the fixing block, and a positioning component is provided at the other end of the connecting block. The positioning component includes multiple positioning bars and multiple spring shafts, which are sequentially and alternately hinged together, with the middle positioning bar being fixedly connected to the connecting block.

[0006] Preferably, a plurality of support members are fixedly provided on the side of the fixed block near the connecting block. The plurality of support members are arranged at intervals along the extension direction of the positioning component, and the movable end of each support member abuts against the inner side of the positioning strip at the corresponding position.

[0007] Preferably, the support member is a retractable square frame structure, which has an outer limiting rod and an inner limiting rod inside, and the inner limiting rod is slidably sleeved inside the outer limiting rod.

[0008] Preferably, the density of the inner limiting rod is greater than the density of the outer limiting rod.

[0009] Preferably, one end of the limiting outer rod is fixedly connected to a connecting pipe, and the other end of the connecting pipe is connected to a buffer frame, the buffer frame being filled with hydraulic oil.

[0010] Preferably, a trigger post is slidably sleeved inside the limiting inner rod, and a baffle is fixedly provided at one end of the trigger post that extends into the buffer frame, and a spring is provided between the baffle and the inner wall of the buffer frame.

[0011] Preferably, the inner wall of the buffer frame near the connecting pipe has multiple flow ports, and a flow-blocking plate is fixedly sleeved on the body of the trigger post, with the flow-blocking plate located at the corresponding position of the flow port.

[0012] Preferably, the number of positioning sliders is three, and the three positioning sliders are evenly distributed along the circumference of the clamping seat. Each positioning slider and its corresponding fixing block, connecting block and positioning component constitute a clamping unit, and the three clamping units are arranged opposite to each other.

[0013] Preferably, each of the three positioning sliders has an inner clamping piece fixedly provided on one side opposite to the other, and the three inner clamping pieces together form an internal clamping space.

[0014] Preferably, the positioning strip is an arc-shaped plate structure, and its outer arc surface is used to contact the inner wall of the workpiece.

[0015] Beneficial effects This invention provides a positioning device for fastener production and processing. It has the following advantages: This invention provides a positioning device for fastener production and processing. The device uses a positioning assembly composed of multiple positioning bars and spring shafts that are hinged in an alternating manner. The positioning bars form a chain structure that can be relatively deflected through the spring shafts. When in contact with the inner wall of the workpiece, each positioning bar can adaptively deflect according to the actual contour of the inner wall, so that multiple positioning bars can jointly conform to different areas of the inner wall of the workpiece. This disperses the clamping force to a larger contact area, reduces the pressure per unit area of ​​the workpiece, and reduces local compression damage to the inner wall of the workpiece.

[0016] This invention provides a positioning device for fastener production and processing. The device features a buffer frame at one end of the outer limiting rod, filled with hydraulic oil and having a flow port. A flow-blocking plate is fitted onto the trigger post. When the positioning slider moves outward, the inner limiting rod slides relative to the outer limiting rod due to increased centrifugal force. The trigger post moves relative to the inner limiting rod under the counterforce of the positioning bar, causing the flow-blocking plate to gradually block the flow port. The flow area of ​​the flow port gradually decreases with increasing centrifugal force, and the resistance of the hydraulic oil to the extension of the inner limiting rod increases accordingly, causing the clamping force of the support member against the positioning bar to approach saturation. This structure limits the maximum clamping pressure while ensuring sufficient clamping force, avoiding overload damage to the workpiece caused by excessive centrifugal force. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention; Figure 2 This is an isometric view of the positioning mechanism of the present invention; Figure 3 This is an axonometric schematic diagram of the positioning strip and related structures of the present invention; Figure 4 This is an axonometric schematic diagram of the positioning bar and related structures of the present invention from another perspective; Figure 5 This is an axonometric schematic diagram of the positioning bar, spring shaft, and related structures of the present invention; Figure 6 This is a partial cross-sectional schematic diagram of the support member of the present invention; Figure 7 This is a cross-sectional schematic diagram of the limiting outer rod and its related structures of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of point A; Figure 9 This is a top-section schematic diagram of the limiting outer rod and its related structures of the present invention.

[0018] The components include: 1. Positioning mechanism; 2. Fixed seat; 3. Machining seat; 4. Machine tool; 5. Drive module; 101. Clamping seat; 102. Positioning slider; 103. Rotating shaft; 104. Fixed block; 105. Positioning strip; 106. Connecting block; 107. Support component; 108. Spring shaft; 109. Inner clamping plate; 110. Limiting outer rod; 111. Buffer frame; 112. Limiting inner rod; 113. Trigger post; 114. Connecting pipe; 115. Flow baffle; 116. Flow port; 117. Strong spring; 118. Baffle plate. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, a fastener manufacturing and processing positioning device includes a machine tool 4, a fixed base 2, a processing base 3, a drive module 5, and a positioning mechanism 1. The fixed base 2 is fixedly mounted on one side of the upper end of the machine tool 4, and the processing base 3 is slidably mounted on the other side. The processing base 3 is connected to an external processing mechanism, which can be a polishing wheel, a grinding brush, or a belt abrasive. The drive module 5 is located inside the machine tool 4, and its output shaft is connected to the fixed base 2 via a pulley or coupling to drive the fixed base 2 to rotate around its own axis. Simultaneously, the drive module 5 also drives the processing base 3 to reciprocate along the length of the machine tool 4 via a lead screw and nut pair or a hydraulic cylinder. The positioning mechanism 1 is rotatably disposed inside the fixed base 2, with one end connected to the output end of the drive module 5 and the other end extending beyond the end face of the fixed base 2.

[0021] Reference Figure 2The positioning mechanism 1 includes a rotating shaft 103, one end of which is connected to the drive module 5, and the other end is fixedly connected to a clamping seat 101. The clamping seat 101 is a disc-shaped component, and its central axis coincides with the axis of the rotating shaft 103. Three radial grooves are evenly distributed circumferentially inside the clamping seat 101, each groove extending radially from the center of the clamping seat 101 to the outer edge. A positioning slider 102 is slidably disposed in each groove, the cross-section of which is adapted to the cross-section of the groove, with a clearance fit of 0.03mm to 0.08mm. The positioning slider 102 is controlled to slide radially along the groove by an electromagnetic drive mechanism (not shown in the figure) embedded inside the clamping seat 101. This electromagnetic drive mechanism can be a linear electromagnet or a voice coil motor. Three positioning sliders 102 are each fixedly provided with an inner clamping piece 109 on one side opposite to each other. The three inner clamping pieces 109 together form a triangular clamping area for clamping small shaft or rod-like workpieces from the outside. Each positioning slider 102 is fixedly provided with a fixing block 104 on the side opposite to the center of the clamping seat 101. The fixing block 104 is roughly rectangular and its length is arranged radially along the slide groove.

[0022] Specifically, in the above-described embodiments, the clearance between the positioning slider 102 and the slide groove is controlled within the range of 0.03mm to 0.08mm. This is to ensure that the positioning slider 102 does not experience radial wobble due to excessive clearance or sliding resistance due to insufficient clearance during sliding. The selection of this clearance is related to the machining accuracy of the slide groove and the surface roughness of the positioning slider 102. Those skilled in the art can make appropriate adjustments within this range according to actual manufacturing conditions.

[0023] like Figure 3 and Figure 4As shown, a connecting block 106 is fixedly installed on the outer side of the fixing block 104 (i.e., the side away from the center of the clamping seat 101), and the connecting block 106 extends horizontally along the width direction of the fixing block 104. One end of the connecting block 106 is welded or bolted to the fixing block 104, and the other end is provided with a positioning component. The positioning component consists of multiple positioning strips 105 and multiple spring shafts 108. The positioning strips 105 are arc-shaped plate structures, with their outer arc surface used to form a surface contact with the inner wall of the workpiece, and their inner arc surface facing the fixing block 104. In this embodiment, there are ten positioning strips 105 and nine spring shafts 108. The ten positioning strips 105 and nine spring shafts 108 are arranged alternately in a straight line, and adjacent positioning strips 105 and spring shafts 108 are connected by hinges, with the middle positioning strip 105 fixedly connected to the end of the connecting block 106. The spring shaft 108 includes a central rotating shaft and a torsion spring fitted outside the rotating shaft. The two ends of the torsion spring are respectively fixed to the ends of two adjacent positioning bars 105, so that the adjacent positioning bars 105 can both deflect relative to each other and tend to the initial straight posture under the action of the torsion spring.

[0024] It is important to note that the torsional stiffness of the torsion spring within the spring shaft 108 determines the sensitivity of the positioning strip 105 to external forces. If the torsional stiffness is too high, the positioning strip 105 will struggle to deflect sufficiently according to the contour of the workpiece's inner wall, resulting in poor fit. Conversely, if the torsional stiffness is too low, the positioning strip 105 will easily deflect excessively under force during clamping, losing stable support for the workpiece. In this embodiment, the torsional stiffness of the torsion spring is set to 0.8 Nm / deg, a value that has been experimentally verified to balance both fit adaptability and support stability. Four positioning strips 105 are symmetrically arranged on either side of the central positioning strip 105. In their free state, each positioning strip 105 is evenly spaced along the length of the connecting block 106, and the spacing between adjacent positioning strips 105 is determined by the axial length of the spring shaft 108.

[0025] like Figure 3 and Figure 5 As shown, a plurality of support members 107 are fixedly disposed on the side of the fixing block 104 near the connecting block 106. The number of support members 107 is equal to the number of positioning strips 105, both being ten, and the support members 107 are arranged at equal intervals along the extension direction of the positioning assembly. One end of each support member 107 is fixedly connected to the side of the fixing block 104, and the other end (i.e., the movable end) abuts against the inner arc surface of the corresponding positioning strip 105. The support members 107 are fixed by bolt connection or welding to ensure that the support members 107 will not fall off the fixing block 104 when subjected to a large axial force. The arrangement direction of each support member 107 extends radially outward along the clamping seat 101.

[0026] Combination Figure 6 and Figure 7The support member 107 is a retractable square frame structure with a rectangular overall outline. It contains a limiting outer rod 110 and a limiting inner rod 112. The limiting outer rod 110 is a hollow rod-shaped structure with a circular cross-section of its inner hole. The limiting inner rod 112 is slidably fitted inside the limiting outer rod 110, with a sliding fit between them. The clearance between the outer diameter of the limiting inner rod 112 and the inner diameter of the limiting outer rod 110 is 0.05mm to 0.15mm, preferably 0.1mm in this embodiment. The mass of the limiting inner rod 112 is greater than the mass of the limiting outer rod 110. Specifically, the limiting inner rod 112 is made of 45# steel with a density of 7.85g / cm³, and the limiting outer rod 110 is made of 7075 aluminum alloy with a density of 2.7g / cm³. The mass ratio between the two is approximately 3:1 to ensure that the limiting inner rod 112 can obtain a significantly greater centrifugal force than the limiting outer rod 110 during rotation.

[0027] It is important to note that the fitting clearance between the inner limiting rod 112 and the outer limiting rod 110 is selected as 0.1mm, based on the following reasons: If the clearance is too small (e.g., less than 0.03mm), on the one hand, the requirements for the coaxiality and roundness of the parts are too high, increasing the processing cost; on the other hand, the sliding resistance of the inner limiting rod 112 inside the outer limiting rod 110 will increase significantly, and the response speed will decrease. If the clearance is too large (e.g., greater than 0.2mm), the inner limiting rod 112 will experience radial wobble inside the outer limiting rod 110, causing the movable end of the support 107 to be unstable when pressing against the positioning strip 105, affecting the clamping accuracy. After multiple tests, 0.05mm to 0.15mm is the reasonable range, and 0.1mm is the optimal value.

[0028] like Figure 7 and Figure 8As shown, a connecting pipe 114 is fixedly connected to one end of the outer limiting rod 110 away from the movable end of the support member 107. The connecting pipe 114 is a hollow tube with open ends, and its inner diameter is the same as that of the outer limiting rod 110. A buffer frame 111 is connected to the other end of the connecting pipe 114. The buffer frame 111 is a cylindrical cavity with one open end and the other closed end, and its open end is sealed to the end of the connecting pipe 114. The interior of the buffer frame 111 is filled with hydraulic oil. A guide hole is axially opened inside the inner limiting rod 112, and a trigger pin 113 is slidably sleeved in the guide hole. One end of the trigger pin 113 extends out of the inner limiting rod 112 and faces the inner arc surface of the positioning strip 105, and the other end passes through the bottom of the inner limiting rod 112 and extends into the interior of the buffer frame 111. The sliding damping between the trigger pin 113 and the inner limiting rod 112 is relatively large, and the sliding friction force between them is set to 10N~12N. A baffle 118 is fixedly installed at one end of the trigger post 113 that extends into the buffer frame 111, and a gap is left between the outer edge of the baffle 118 and the inner wall of the buffer frame 111. A spring 117 is connected between the baffle 118 and the inner wall of the buffer frame 111. The spring 117 is always in a compressed state and applies a spring force to the baffle 118 in the direction of the positioning strip 105.

[0029] like Figure 8 and Figure 9 As shown, the buffer frame 111 has multiple flow ports 116 inside the side near the connecting pipe 114, and the flow ports 116 are evenly distributed along the circumference of the buffer frame 111. In this embodiment, there are four flow ports 116, each of which is a circular through hole with a diameter of 2mm. A flow-blocking plate 115 is fixedly sleeved on the body of the trigger post 113. The flow-blocking plate 115 is a disc-shaped component, and its outer edge contour is adapted to the inner wall contour of the buffer frame 111. The flow-blocking plate 115 is located at the corresponding position of the flow ports 116. When the trigger post 113 moves axially, the flow-blocking plate 115 moves synchronously with the trigger post 113, gradually blocking the flow ports 116. After the flow ports 116 are blocked, the flow resistance of hydraulic oil between the buffer frame 111 and the connecting pipe 114 increases, which manifests as an increase in the oil pressure inside the buffer frame 111.

[0030] Specifically, in the above-described embodiment, the number and diameter of the flow ports 116 determine the initial flow capacity of the hydraulic oil. The total cross-sectional area of ​​the four 2mm diameter flow ports 116 in their fully open state is approximately 12.56mm², which is sufficient to meet the flow requirements of the hydraulic oil during the rapid extension and retraction of the support member 107. As the baffle plate 115 gradually blocks the flow ports 116, the flow area gradually decreases, and the hydraulic damping force increases non-linearly. When the baffle plate 115 blocks only one flow port 116 fully open, the flow area is approximately 3.14mm². At this point, the hydraulic damping force and the centrifugal force on the limiting inner rod 112 reach dynamic equilibrium, and the elongation of the support member 107 tends to stabilize.

[0031] Working principle: In the initial state, all three positioning sliders 102 are in the retracted position, and the positioning components are retracted within the outer edge of the clamping base 101. The operator places the internal threaded sleeve workpiece to be processed on the outside of the three clamping units and then starts the electromagnetic drive mechanism. The electromagnetic drive mechanism drives the three positioning sliders 102 to slide outward synchronously radially along their respective slides. The sliding speed is controlled by the input current of the electromagnetic drive mechanism, which is set to 2 mm / s in this embodiment.

[0032] When the positioning slider 102 slides outward, it drives the entire positioning assembly to move outward synchronously through the fixing block 104 and the connecting block 106. Each positioning strip 105 in the positioning assembly first contacts the inner wall of the workpiece. Since the positioning strips 105 are staggered and hinged by the spring shaft 108, and each positioning strip 105 is independently supported by the corresponding support member 107, each positioning strip 105 generates a corresponding deflection angle according to the curvature of the inner wall at its contact position. After deflection, the ten positioning strips 105 form an arc-shaped envelope that basically matches the contour of the inner wall of the workpiece, and the outer arc surface of each positioning strip 105 forms surface contact with different circumferential areas of the inner wall of the workpiece.

[0033] Subsequently, the operator activates the rotation output of drive module 5. Drive module 5 drives clamping seat 101 to rotate via rotating shaft 103, and clamping seat 101 further drives the entire positioning mechanism 1 to rotate. During rotation, the inner limiting rod 112 is subjected to centrifugal force. Since the mass of the inner limiting rod 112 is significantly greater than the mass of the outer limiting rod 110, the centrifugal force on the inner limiting rod 112 is much greater than the centrifugal force on the outer limiting rod 110. This centrifugal force causes the inner limiting rod 112 to slide outward relative to the outer limiting rod 110. The extended end of the inner limiting rod 112 pushes the support member 107 to extend as a whole. The movable end of the support member 107 applies greater resistance to the inner arc surface of the positioning strip 105, making the positioning strip 105 fit more tightly against the inner wall of the workpiece, thereby increasing the clamping force.

[0034] As the inner limiting rod 112 slides outward, the trigger pin 113 moves synchronously with the inner limiting rod 112 under the action of damping force. When the end of the trigger pin 113 contacts the inner arc surface of the positioning strip 105, the positioning strip 105 applies a reverse thrust to the trigger pin 113. This reverse thrust overcomes the sliding friction between the trigger pin 113 and the inner limiting rod 112, causing the trigger pin 113 to slide in the opposite direction relative to the inner limiting rod 112. The trigger pin 113 drives the flow-blocking plate 115 to move closer to the inside of the buffer frame 111, and the flow-blocking plate 115 gradually blocks the flow port 116.

[0035] As the flow port 116 is gradually blocked, the flow area of ​​the hydraulic oil decreases, and the damping force of the hydraulic oil on the continued extension of the limiting inner rod 112 increases. When the centrifugal force further increases, the degree of obstruction of the flow port 116 by the flow baffle 115 also increases. The rate of increase of the hydraulic damping force is higher than the rate of increase of the centrifugal force, causing the extension of the limiting inner rod 112 to tend to saturate. As a result, the clamping force of the support member 107 on the positioning strip 105 is limited to a preset range, avoiding overload damage to the workpiece caused by the unlimited increase of the clamping force at high speeds.

[0036] When it is time to unload the workpiece, the operator stops the rotation output of the drive module 5, the clamping seat 101 stops rotating, and the centrifugal force disappears. The spring 117 pushes the trigger post 113 and the flow deflector 115 back to their initial positions, and the flow port 116 returns to its fully open state. Under the push of the hydraulic oil flowing back from the buffer frame 111 to the connecting pipe 114 and the action of the limit inner rod 112 itself, the limit inner rod 112 retracts into the limit outer rod 110. Subsequently, the electromagnetic drive mechanism drives the positioning slider 102 to slide radially inward, the positioning component disengages from the inner wall of the workpiece, and the operator can then remove the processed workpiece.

[0037] Furthermore, when it is necessary to clamp small-sized workpieces such as shafts or rods, the workpiece can be placed between the three inner clamping plates 109, and the positioning slider 102 can be driven to retract inward, so that the three inner clamping plates 109 clamp the workpiece from the outside. This achieves the dual function of the same device for inner wall support clamping of internal threaded sleeve workpieces and outer wall clamping of shaft workpieces.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A positioning device for fastener production and processing, characterized in that, include: The machine tool (4) has a fixed seat (2) fixedly installed on one side of its upper end and a machining seat (3) slidably installed on the other side. The machining seat (3) is connected to the machining mechanism. The drive module (5) is located inside the machine tool (4) and is used to drive the fixed seat (2) to rotate and drive the machining seat (3) to slide. The positioning mechanism (1) is rotatably disposed inside the fixed base (2) and connected to the drive module (5); The positioning mechanism (1) includes a rotating shaft (103), one end of which is connected to the drive module (5), and the other end is fixedly provided with a clamping seat (101). Multiple positioning sliders (102) are slidably arranged inside the clamping seat (101) along its circumference. A fixing block (104) is fixedly provided on one side of the positioning slider (102), and a connecting block (106) is fixedly provided on the side of the fixing block (104). A positioning component is provided at the other end of the connecting block (106). The positioning component includes multiple positioning bars (105) and multiple spring shafts (108). The positioning bars (105) and spring shafts (108) are sequentially and interlocked, and the middle positioning bar (105) is fixedly connected to the connecting block (106).

2. The fastener production and processing positioning device according to claim 1, characterized in that: The fixing block (104) is fixedly provided with a plurality of support members (107) on the side near the connecting block (106). The plurality of support members (107) are arranged at intervals along the extension direction of the positioning component, and the movable end of each support member (107) abuts against the inner side of the positioning strip (105) at the corresponding position.

3. The fastener production and processing positioning device according to claim 2, characterized in that: The support member (107) is a retractable square frame structure, with a limiting outer rod (110) and a limiting inner rod (112) inside. The limiting inner rod (112) is slidably sleeved inside the limiting outer rod (110).

4. The fastener production and processing positioning device according to claim 3, characterized in that: The density of the inner limiting rod (112) is greater than the density of the outer limiting rod (110).

5. A fastener production and processing positioning device according to claim 3, characterized in that: One end of the limiting outer rod (110) is fixedly connected to a connecting pipe (114), and the other end of the connecting pipe (114) is connected to a buffer frame (111), which is filled with hydraulic oil.

6. A fastener production and processing positioning device according to claim 5, characterized in that: The inner limit rod (112) is slidably fitted with a trigger post (113). One end of the trigger post (113) that extends into the buffer frame (111) is fixedly fitted with a baffle (118). A spring (117) is provided between the baffle (118) and the inner wall of the buffer frame (111).

7. A fastener production and processing positioning device according to claim 6, characterized in that: The buffer frame (111) has multiple flow ports (116) on the inner wall of the side near the connecting pipe (114). A flow-blocking plate (115) is fixedly sleeved on the body of the trigger post (113), and the flow-blocking plate (115) is located at the corresponding position of the flow port (116).

8. A fastener production and processing positioning device according to claim 1, characterized in that: The number of positioning sliders (102) is three. The three positioning sliders (102) are evenly distributed along the circumference of the clamping seat (101). Each positioning slider (102) and its corresponding fixing block (104), connecting block (106) and positioning component constitute a clamping unit. The three clamping units are arranged opposite to each other.

9. A fastener production and processing positioning device according to claim 8, characterized in that: The three positioning sliders (102) are respectively fixedly provided with inner clamping pieces (109) on their opposite sides, and the three inner clamping pieces (109) together form an internal clamping space.

10. A fastener production and processing positioning device according to claim 1, characterized in that: The positioning strip (105) is an arc-shaped plate structure, and its outer arc surface is used to contact the inner wall of the workpiece.

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