A double-ended pin extractor

Abstract

The utility model discloses a double -end puller belongs to actuator technical field. It includes the casing of two ends are equipped with through -hole, the electromagnetic subassembly of drive sliding sleeve, locking mechanism, and locking mechanism includes two root pull rod with butt joint part, the fixed sleeve fixed in through -hole, two pull rod respectively partial extension in fixed sleeve, and fixed sleeve forms the passageway for pull rod axial sliding with through -hole, and pull rod is pre -tensioned in passageway by second elastic part and has the tendency of axial displacement to passageway inside, and the circumference of the corresponding position of fixed sleeve and two pull rod all is equipped with the opening, and the opening is equipped with butt joint piece, and the outside axial sliding sleeve of fixed sleeve is equipped with sliding sleeve, and sliding sleeve has the locking position of making butt joint piece with butt joint part butt joint and the unlocking position of butt joint piece disengaging butt joint part. The device can be repeatedly used through elastic pre -tensioning and electromagnetic drive cooperation, can provide stable separation environment for connecting equipment, and the structure is compact and reliable.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, and in particular to a double-headed pin puller. Background Technology

[0002] A pin puller is an actuator with a pushing or pulling function, widely used in aerospace and other fields, especially in airdrop supply systems where it plays a crucial role in unlocking and releasing. Currently, most pin pullers are pyrotechnic actuators, typically using explosive bolts for unlocking and releasing. This unlocking and releasing method has significant drawbacks: firstly, it can only complete the unlocking task once and cannot be reused, resulting in high costs and significant risks; secondly, explosive bolts have poor stability during use and can easily cause additional disturbances to the connected equipment. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a double-headed pin puller that is reusable and provides a stable separation environment for connected devices.

[0004] The specific technical solution of this utility model is as follows: a double-headed pin puller, comprising a housing with through holes at both ends, and a locking mechanism and an electromagnetic component inside the housing;

[0005] The locking mechanism includes two pull rods with abutment portions and a fixed sleeve fixed in a through hole. The two pull rods are partially inserted into the fixed sleeve. The fixed sleeve and the through hole form a channel for the pull rods to slide axially. The pull rods are pre-tightened in the channel by a second elastic element and have a tendency to move axially inward in the channel. The fixed sleeve and the two pull rods are provided with openings in the circumferential direction at corresponding positions. The openings are provided with abutment portions. The fixed sleeve is axially slidably fitted with a sliding sleeve on the outside. The sliding sleeve has a locked position and an unlocked position. When the sliding sleeve is in the locked position, the sliding sleeve constrains the abutment portion to the position of abutment, thereby limiting the axial movement of the pull rods inward in the channel. When the sliding sleeve is in the unlocked position, the abutment portion can move away from and release the constraint on the abutment portion.

[0006] The electromagnetic component includes a drive slider connected to a sliding sleeve, which drives the sliding sleeve to switch between a locked position and an unlocked position.

[0007] In the locked state of the double-headed pin puller, the drive slider moves the sliding sleeve to the locked position. The sliding sleeve presses the abutment towards the pull rod, constraining the abutment at the position where it abuts against the abutment part. The second elastic element is in a compressed state, and the axial constraint force between the pull rod and the abutment is greater than the preload of the second elastic element, thus locking the position of the pull rod. The pull rod located on the outside of the housing is locked to the connecting device. When the drive slider moves the sliding sleeve axially to the unlocked position, the sliding sleeve releases the constraint on the abutment, and the axial constraint force between the pull rod and the abutment gradually decreases. The preload of the second elastic element, pushed by the second elastic element, causes the abutment to move away from the abutment part, releasing the lock on the pull rod. The pull rod moves into the housing, thus unlocking the pull rod located outside the housing from the connecting device. After power failure, manually pulling the pull rod compresses the second elastic element to store energy. When the second elastic element is compressed to a certain extent, the abutment part passes through the opening of the fixed sleeve, driving the slider to drive the sliding sleeve back to the locked position. The sliding sleeve presses against the abutment, causing the abutment to re-abut against the abutment, limiting the pull rod and restoring the locked state. The above-mentioned double-headed pin puller does not rely on one-time, high-impact unlocking methods such as explosion bolts. Instead, it controls the axial displacement of the sliding sleeve relative to the fixed sleeve by energizing and de-energizing the electromagnetic component, allowing the abutment to switch between the locked and unlocked positions. This enables the device to be reused. At the same time, the electromagnetic component can precisely control the unlocking speed and separation timing by adjusting parameters such as current magnitude and energizing / de-energizing sequence, thereby providing a stable separation environment for the connecting device.

[0008] Optionally, the sliding sleeve includes a pressing part and an unlocking groove. The pressing part protrudes towards the axis of the fixed sleeve relative to the unlocking groove. When the sliding sleeve is in the locked position, the pressing part is aligned with the corresponding opening, and the pressing part constrains the abutment member to the position of abutting with the abutment part. When the sliding sleeve is in the unlocked position, the unlocking groove is aligned with the corresponding opening, forming a storage space that can accommodate the abutment member. The second elastic member pushes the abutment member into the storage space.

[0009] In the above technical solution, the axial sliding of the sleeve allows the pressing part and the unlocking groove to be aligned with the opening, thereby realizing the switching between the locking and unlocking positions of the sleeve. The pressing part and the unlocking groove occupy the opening position in a time-sharing manner, eliminating static redundant space and making the structure compact.

[0010] Optionally, the electromagnetic assembly further includes an electromagnetic coil and a yoke, the driving slider is an armature, the armature is pre-tightened between the yoke and the housing by a first elastic element and axially displaced between the yoke and the housing in response to changes in magnetic force, and the pre-tightening direction of the first elastic element is opposite to the magnetic attraction direction.

[0011] In the above technical solution, in the locked state where the electromagnetic coil is not energized, the first elastic element moves the armature away from the yoke, and the sliding sleeve is in the locked position. When the electromagnetic coil is energized and generates magnetic force, the armature overcomes the preload of the first elastic element and slides towards the yoke, simultaneously driving the sliding sleeve to slide axially and reach the unlocked position. After power is cut off, the first elastic element pushes the armature back to its original position, driving the sliding sleeve back to the locked position. This energized unlocking method ensures rapid unlocking via electrical signal during normal power supply, while automatically maintaining the locked position during abnormal power outages, preventing accidental separation due to power failure.

[0012] Optionally, the opposing ends of the yoke and armature are respectively set as inclined surfaces, with the inclination directions of the two inclined surfaces being opposite, forming a symmetrical complementary structure.

[0013] In the above technical solution, when the yoke and the armature are attracted by the inclined surfaces, the contact point gradually approaches the center from the edge. The equivalent air gap length is shorter than that of the planar structure, and the effective cross-sectional area of ​​the air gap is increased to reduce the air gap magnetic resistance during attraction. In addition, the symmetrical complementary design of the inclined surfaces ensures that the radial component of the magnetic attraction force always points to the central axis, producing a bidirectional centering effect and avoiding the armature tilting and jamming due to external vibration or assembly errors.

[0014] Optionally, the yoke is provided with a bent portion, and a semi-enclosed installation space is formed between the bent portion and the housing, and the electromagnetic coil is installed in the installation space.

[0015] In the above technical solution, the cross-sectional area of ​​the bend corner is reduced, generating a "magnetic yoke" effect. Magnetic lines converge in this area, effectively enhancing the local magnetic induction intensity and improving the electromagnetic conversion efficiency. In addition, the electromagnetic wire is installed in the semi-enclosed space formed by the bend and the shell, which is compact and saves internal space of the equipment.

[0016] Optionally, the electromagnetic coil is at least partially enclosed by a coil housing, and the electromagnetic coil is connected to the yoke through the coil housing.

[0017] In the above technical solution, the electromagnetic coil is fixed in the installation space by the coil shell to prevent the electromagnetic coil from shifting and improve the stability of the equipment. At the same time, the coil shell acts as a barrier for mechanical buffering and physical isolation, extending the service life of the electromagnetic coil and ensuring the long-term stable operation of the equipment.

[0018] Optionally, the end of the pull rod that extends into the fixed sleeve is provided with a narrowed diameter section, and a step is formed between the narrowed diameter section and the pull rod as an abutment part.

[0019] In the above technical solution, the steps include flat steps or inclined steps. The narrow section and the connecting part can be precisely formed by conventional machining methods such as turning and grinding, without the need for complex processes or molds, which greatly reduces production costs and improves production efficiency.

[0020] Optionally, a transition fillet or transition chamfer is provided between the diameter narrowing section, the abutment portion and the pull rod.

[0021] In the above technical solution, the transition rounded corner or transition chamfer provides a smooth sliding path for the abutment, which can guide the abutment into the storage space and prevent the abutment from being blocked due to jamming; at the same time, it reduces the risk of the abutment being damaged by sharp corners during the activity.

[0022] Optionally, the pull rod has a protruding connecting part on a section located inside the through hole, and the second elastic element is sleeved on the pull rod, with one end connected to the housing and the other end connected to the connecting part.

[0023] In the above technical solution, the second elastic element is sleeved on the pull rod, eliminating the need for additional space for its placement. This effectively saves internal space and achieves a compact layout. Furthermore, the second elastic element forms a guide structure on the pull rod. When the pull rod moves axially under external force or pre-tightening force, the second elastic element can limit the radial sway of the pull rod, thus improving the overall stability and reliability of the pin puller.

[0024] Optionally, the end of the through hole near the fixed sleeve is provided with a small-diameter section, the diameter of which is smaller than the size of the connecting part, so as to restrict the passage of the connecting part.

[0025] In the above technical solution, since the diameter of the small-diameter section is smaller than the size of the connecting part, when the pull rod moves axially into the housing under the action of the second elastic element, the connecting part will be blocked by the small-diameter section, thereby limiting the depth of the pull rod entering the fixed sleeve. This effectively avoids the two pull rods colliding inside the housing due to excessive movement, ensuring that the components of the double-headed pin puller maintain normal cooperation and stable performance during operation.

[0026] Optionally, the housing has a slot on the side facing the fixing sleeve, the bottom of the slot is penetrated by a small diameter section, and both ends of the fixing sleeve extend into the slot and engage with the housing.

[0027] In the above technical solution, the fixing sleeve can be snapped into the housing, making the connection convenient and quick. At the same time, the structure in which the bottom of the slot and the small-diameter section penetrate through can accurately guide the fixing sleeve and the through hole to be aligned coaxially, so that the sliding path of the pull rod is always in a straight line, effectively reducing the wear between the pull rod and the inner wall of the fixing sleeve caused by eccentricity.

[0028] Optionally, the electromagnetic components are provided in two sets, symmetrically arranged on opposite sides of the fixed sleeve, with the two driving sliders jointly driving the sliding sleeve.

[0029] In the above technical solution, when the two sets of symmetrical excitation are used, the magnetic attraction forces on both sides are balanced, eliminating the lateral magnetic attraction force generated by the single-sided excitation of the single coil on the pull rod, thus avoiding problems such as low unlocking efficiency and poor stability. At the same time, the magnetic force superposition provides a stronger driving force for the sliding sleeve, enabling it to slide quickly and achieve efficient and stable fast unlocking.

[0030] Compared with the prior art, the present invention has at least the following advantages:

[0031] (1) Reusable and highly stable: The above-mentioned double-headed pin puller does not rely on one-time, high-impact unlocking methods such as explosion bolts. Instead, it controls the axial displacement of the sliding sleeve relative to the fixed sleeve by controlling the power on and off of the electromagnetic component, so that the abutting part switches between the "locked state of abutting the pull rod" and the "unlocked state of entering the storage space", realizing the reusability of the device. At the same time, the electromagnetic component can precisely control the unlocking speed and separation timing by adjusting parameters such as the current magnitude and the power on and off sequence, thereby providing a stable separation environment for the connected equipment.

[0032] (2) Quick unlocking: Two sets of electromagnetic components are set to provide stronger driving force for the sliding sleeve, enabling it to slide quickly. The transition rounded corners or transition chamfers provide a smooth sliding path for the abutment, which can guide the abutment into the storage space and prevent the abutment from being blocked due to jamming, thereby achieving efficient and stable quick unlocking. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the external shape of the double-headed pin puller of this utility model;

[0034] Figure 2 This is a schematic diagram of the locked state of the double-headed pin puller of this utility model;

[0035] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0036] Figure 4 This is a structural diagram of the unlocked state of the double-headed pin puller of this utility model;

[0037] Figure 5 yes Figure 4 A magnified view of a section at point B.

[0038] The attached figures are labeled as follows: 1. Pull rod; 2. Housing; 3. Second elastic element; 4. Through hole; 41. Small diameter section; 5. Yoke; 51. Bending part; 6. Electromagnetic coil; 7. Armature; 8. First elastic element; 9. Sliding sleeve; 91. Compression sleeve; 92. Sleeve body; 10. Abutment; 11. Fixing sleeve; 12. Opening; 13. Abutment; 14. Diameter narrowing section; 15. Unlocking groove; 16. Connecting part; 17. Coil housing; 18. Installation space; 19. Storage space; 20. Slot; 21. Housing sleeve; 22. Support base; 23. Flange; 24. Compression part. Detailed Implementation

[0039] The present invention will be further described below with reference to embodiments. Unless otherwise specified, all devices, connection structures, and methods involved in this invention are known in the art.

[0040] Example 1

[0041] Reference Figures 1 to 5 As shown, this utility model provides a double-headed pin puller, including a housing 2 with through holes 4 at both ends, and a locking mechanism and an electromagnetic component inside the housing 2.

[0042] The housing 2 adopts a modular assembly structure, including a support base 22, a flange 23, and two outer shell sleeves 21. The two outer shell sleeves 21 are respectively located at both ends of the housing 2 and are connected to the support base 22 and the flange 23 by screws. The support base 22 and the flange 23 are arranged opposite to each other and connected by screws to form the central load-bearing frame of the housing 2. The through hole 4 uses the sleeves of the outer shell sleeves 21 at both ends as the inlet and is axially arranged through the support base 22 and the flange 23 to form a straight channel that runs through the housing 2.

[0043] The locking mechanism includes two pull rods 1 with abutment portions 13 and a fixing sleeve 11 fixed in a through hole 4. The two pull rods 1 are partially inserted into the fixing sleeve 11. The fixing sleeve 11 and the through hole 4 form a channel for the pull rods 1 to slide axially. The pull rods 1 are pre-tightened in the channel by the second elastic member 3 and have a tendency to move axially inward in the channel. The fixing sleeve 11 and the two pull rods 1 are provided with openings 12 in the circumferential direction at corresponding positions. That is, the opening position of the opening 12 corresponds to the sliding path of the pull rod 1 in the sliding sleeve 9. The abutment member 10 is provided in the opening 12. The sliding sleeve 9 is axially slidably fitted on the outside of the fixing sleeve 11. The sliding sleeve 9 has a locked position and an unlocked position. When the sliding sleeve 9 is in the locked position, the sliding sleeve 9 constrains the abutment member 10 to the position of abutting with the abutment portion 13 to limit the axial displacement of the pull rod 1 inward in the channel. When the sliding sleeve 9 is in the unlocked position, the abutment member 10 can move away from and release the constraint on the abutment portion 13. The sliding sleeve 9 includes a pressing part 24 and an unlocking groove 15. The pressing part 24 protrudes towards the axis of the fixed sleeve 11 relative to the unlocking groove 15. When the sliding sleeve 9 is in the locked position, the pressing part 24 is approximately or completely aligned with the corresponding opening 12, and the pressing part 24 constrains the abutment member 10 to abut against the abutment part 13. When the sliding sleeve 9 is in the unlocked position, the unlocking groove 15 is aligned with the corresponding opening 12, forming a storage space that can accommodate the abutment member. The second elastic member 3 pushes the abutment member 10 into the storage space. In this embodiment, a steel ball is used as the abutment member 10. The steel ball is placed at the opening 12, and the diameter of the opening 12 is slightly larger than the diameter of the steel ball, so that the steel ball has room for movement. When energized, it can move radially and fall into the storage space 19 formed by the unlocking groove 15 and the opening 12. In this embodiment, the pressing part 24 is flush with the end face of the sliding sleeve. It can be understood that in other embodiments, the pressing part 24 may also protrude towards the axis of the fixed sleeve 11 relative to the end face of the sliding sleeve.

[0044] The electromagnetic assembly includes an electromagnetic coil 6, an armature 7, and a yoke 5. The yoke 5 is connected to the housing 2 by screws. The armature 7 is pre-tightened between the yoke 5 and the housing 2 by a first elastic member 8 and moves axially between the yoke 5 and the housing 2 in response to changes in magnetic force. The pre-tightening direction of the first elastic member 8 is opposite to the magnetic attraction direction. A sliding sleeve 9 is connected to the side of the armature 7 facing the fixed sleeve 11. When the armature 7 and the yoke 5 are attracted, the armature 7 drives the sliding sleeve 9 to slide axially. The unlocking groove 15 aligns with the corresponding opening 12 to form a storage space 19. The second elastic member 3 overcomes the axial constraint force and pushes the pull rod 1 inward, so that the abutment 10 enters the storage space 19. In this embodiment, the first elastic member 8 is a wave spring, and the second elastic member 3 is a spring.

[0045] In the locked state where the electromagnetic coil 6 is not energized, the first elastic element 8 moves the armature 7 away from the yoke 5, and the pressing part 24 above the opening 12 of the fixing sleeve 11 presses the abutment 10 towards the pull rod 1, constraining the abutment 10 to the position of abutting with the abutment part 13. The second elastic element 3 is in a compressed state, and the axial constraint force between the pull rod 1 and the abutment 10 is greater than the preload of the second elastic element 3, thus locking the position of the pull rod 1. The pull rod 1 located outside the housing 2 is locked to the connecting device. When unlocking is required, the electromagnetic coil 6 is energized, and the electromagnetic coil 6 generates a magnetic field. The armature 7 and the yoke 5 are attracted, and the yoke 5 is fixed. The armature 7 overcomes the preload of the first elastic element 8 and slides towards the yoke 5, while simultaneously driving the sliding sleeve 9 to slide axially. When the armature 7 and the yoke 5 are in contact, the unlocking groove 1515 of the sliding sleeve 9 is approximately or completely aligned with the opening of the fixing sleeve 11. The opening 12 forms a storage space 19, and the abutment 10 has a movable space. The axial constraint force between the pull rod 1 and the abutment 10 gradually becomes less than the preload force of the second elastic element 3. Under the push of the second elastic element 3, the abutment 10 is pushed into the storage space 19 by the pull rod 1 and the fixed sleeve 11. The sliding sleeve 9 loses its constraint on the abutment 10, and the abutment 10 releases its lock on the pull rod 1. The pull rod 1 moves into the housing 2 to unlock the pull rod 1 located outside the housing 2 from the connecting device. After power failure, the pull rod 1 is manually pulled to compress and store energy in the second elastic element 3. When the second elastic element 3 is compressed to a certain extent, the abutment 13 passes through the opening 12 of the fixed sleeve 11, the first elastic element 8 pushes the armature 7 to reset, and the sliding sleeve 9 squeezes the abutment 10, so that the abutment 10 abuts against the pull rod 1 again, thus limiting the pull rod 1 and restoring the locked state.

[0046] The aforementioned double-headed pin puller does not rely on one-time, high-impact unlocking methods such as explosive bolts. Instead, it controls the axial displacement of the sliding sleeve 9 relative to the fixed sleeve 11 by switching the electromagnetic component on and off. This allows the abutting part 10 to switch between a "locked state abutting against the pull rod 1" and an "unlocked state entering the storage space 19", enabling the device to be reused. At the same time, the electromagnetic component can precisely control the unlocking speed and separation timing by adjusting parameters such as the current magnitude and the power-on / off sequence, thereby providing a stable separation environment for the connected equipment.

[0047] In this embodiment, the through hole 4 and the fixing sleeve 11 cooperate to form a continuous straight channel. The two pull rods 1 slide relative to each other along the same channel, and the locking and unlocking functions are achieved by moving towards or away from each other. This structure utilizes the coaxial characteristics of a single channel to ensure the symmetry and synchronization of the movement of the two pull rods 1, which facilitates the precise engagement of the abutment 10 at the opening 12 of the fixing sleeve 11. In another embodiment, the through hole 4 uses the sleeves of the outer casing 21 at both ends as the entrance and axially penetrates the support 22 or flange 23 respectively to form two relatively independent straight channels. The two pull rods 1 slide along their respective channels. This design avoids direct contact between the two pull rods 1 in the same space through the separated channels, reducing the risk of movement interference. At the same time, the stroke of a single pull rod 1 can be flexibly adjusted according to different working conditions, improving the adaptability of the pin puller to complex application scenarios.

[0048] Example 2

[0049] Based on Example 1, such as Figure 2 and Figure 4 As shown, this utility model provides a double-headed pin puller. The fixing sleeve 11 has two opposing openings 12 at each end, and each opening 12 is equipped with an abutment 10, so that each pull rod 1 is radially limited by the two abutment members 10. The two abutment members 10 limit the pull rod 1 from both radial sides, effectively counteracting the lateral force on the pull rod 1, preventing it from shifting or shaking in the locked state, and ensuring that the pull rod 1 remains stable even in complex external force or vibration environments.

[0050] The electromagnetic components employ a symmetrical layout, positioned on opposite sides of the fixed sleeve 11. Two armatures 7 are fixedly connected to opposite sides of the sliding sleeve 9, enabling synchronous driving of the sliding sleeve 9. When the electromagnetic coil 6 is energized, the two sets of armatures 7 respond synchronously to the magnetic field force through their symmetrically distributed magnetic force, jointly driving the sliding sleeve 9 to slide axially along the fixed sleeve 11. This design not only eliminates the lateral magnetic attraction force generated by the single-sided energization of a single coil on the pull rod 1, avoiding problems such as low unlocking efficiency and poor stability; but also provides a stronger driving force to the sliding sleeve 9 through magnetic force superposition, enabling it to overcome the axial constraint force of the two abutment parts 10 and slide quickly, achieving efficient and stable rapid unlocking. It should be noted that the shapes of the two yokes 5 and armatures 7 can be adapted to the spatial dimensions and installation requirements of the supporting frame in the middle of the housing 2. The key is that the spacing between the two armatures 7 and the corresponding yokes 5 must be consistent, and the radial positions between the two armatures 7 and the two yokes 5 must correspond, so that when the two armatures 7 are energized, they can form a synchronous motion trajectory in the axial direction, avoiding magnetic imbalance or motion interference caused by spacing or radial position deviation.

[0051] Reference Figure 2 and Figure 4In the electromagnetic assembly, the opposing ends of the yoke 5 and armature 7 are respectively set as inclined surfaces, with opposite inclination directions, forming a symmetrical complementary structure. When the inclined surfaces of the yoke 5 and armature 7 are attracted together, the contact point gradually approaches the center from the edge, resulting in a shorter equivalent air gap length compared to the planar structure and an increased effective cross-sectional area of ​​the air gap, thereby reducing the air gap magnetic resistance during attraction. In addition, the symmetrical complementary design of the inclined surfaces ensures that the radial component of the magnetic attraction force always points towards the central axis, producing a bidirectional centering effect and preventing the armature 7 from tilting or jamming due to external vibration or assembly errors.

[0052] Reference Figure 2 and Figure 4 In the electromagnetic assembly, the yoke 5 has a bent portion 51, which forms a semi-enclosed mounting space 18 with the housing 2. The electromagnetic coil 6 is installed within the mounting space 18. The cross-sectional area of ​​the bend 51 is reduced at the corner, generating a "magnetic yoke" effect, where magnetic lines of force converge, effectively enhancing the local magnetic induction intensity and improving the electromagnetic conversion efficiency. In addition, the electromagnetic coil 6 is installed in the semi-enclosed space formed by the bent portion 51 and the housing 2, resulting in a compact layout and saving internal space of the equipment.

[0053] Reference Figure 2 and Figure 4 In the electromagnetic assembly, the electromagnetic coil 6 is partially enclosed by the coil housing 17. The electromagnetic coil 6 is fixedly connected to the yoke 5 via the coil housing 17, and the flange 23 is fixedly connected to the coil housing 17 with screws. The coil housing 17 secures the electromagnetic coil 6 in the installation space 18, preventing displacement and improving equipment stability. Simultaneously, the coil housing 17 acts as a mechanical buffer and physical isolation barrier, extending the service life of the electromagnetic coil 6 and ensuring long-term stable operation of the equipment.

[0054] Reference Figure 3 and Figure 5 In the electromagnetic assembly, the sliding sleeve 9 is a split structure, including a detachably connected sleeve body 92 and a compression sleeve 91. The compression sleeve 91 is located at the end of the sleeve body 92 facing the outer casing 21 and is threadedly connected to the sleeve body 92. The compression part 24 and the unlocking groove 15 are provided on the compression sleeve 91 at this end. By adjusting the thread engagement depth between the compression sleeve 91 and the sleeve body 92, the overall length of the sliding sleeve 9 or the size of the internal storage space 19 can be finely adjusted, improving its adaptability.

[0055] Reference Figure 3 and Figure 5In the locking mechanism, the end of the pull rod 1 that extends into the fixed sleeve 11 has a narrowed diameter section 14, forming a step between the narrowed diameter section 14 and the pull rod 1 as an abutment part 13. The step can be a flat step or a sloped step. The narrowed section and the abutment part 13 can be precisely formed using conventional machining methods such as turning and grinding, eliminating the need for complex processes or molds, significantly reducing production costs and improving production efficiency. Understandably, in another embodiment, the end of the pull rod 1 that extends into the fixed sleeve 11 has a groove-like structure as the abutment part 13.

[0056] In this preferred embodiment, a transition fillet or transition chamfer is provided between the narrowed diameter section 14, the abutment portion 13, and the pull rod 1. The transition fillet or transition chamfer provides a smooth sliding path for the abutment 10, guiding the abutment 10 into the storage space 19 and preventing the abutment 10 from being blocked due to jamming; at the same time, it reduces the risk of the abutment 10 being damaged by sharp corners during the movement.

[0057] Reference Figure 2 and Figure 4 In the locking mechanism, the second elastic element 3 is installed in the outer casing 21. A protruding connecting portion 16 is provided on a section of the pull rod 1 located within the through hole 4. The second elastic element 3 is sleeved on the pull rod 1, with one end connected to or abutting against the casing 2, and the other end connected to or abutting against the connecting portion 16. The second elastic element 3 is sleeved on the pull rod 1, eliminating the need for additional space for its placement, effectively saving internal space in the casing 2 and achieving a compact layout. Simultaneously, the second elastic element 3 forms a guiding structure on the pull rod 1. When the pull rod 1 moves axially under external force or the pre-tightening force of the second elastic element 3, the second elastic element 3 can limit the radial sway of the pull rod 1, improving the overall stability and reliability of the pin puller.

[0058] In this preferred embodiment, the end of the through hole 4 near the fixed sleeve 11 is provided with a small-diameter section 41, the diameter of which is smaller than the size of the connecting part 16, to restrict the passage of the connecting part 16. Since the diameter of the small-diameter section 41 is smaller than the size of the connecting part 16, when the pull rod 1 moves axially into the housing 2 under the action of the second elastic member 3, the connecting part 16 will be blocked by the small-diameter section 41, thereby limiting the depth of the pull rod 1 into the fixed sleeve 11, effectively preventing the two pull rods 1 from colliding inside the housing 2 due to excessive movement, and ensuring that the components of the double-headed pin puller maintain normal cooperation and stable performance during operation.

[0059] Reference Figure 3 and Figure 5In the locking mechanism, a slot 20 is provided on the side of the housing 2 facing the fixed sleeve 11. The bottom of the slot 20 is penetrated by a small-diameter section 41. Both ends of the fixed sleeve 11 extend into the slot 20 and engage with the housing 2. The fixed sleeve 11 can engage with the housing 2, making the connection convenient and quick. At the same time, the structure of the slot 20 bottom penetrating the small-diameter section 41 can accurately guide the fixed sleeve 11 to be coaxially aligned with the through hole 4, so that the sliding path of the pull rod 1 is always in a straight line, effectively reducing the wear between the pull rod 1 and the inner wall of the fixed sleeve 11 caused by eccentricity.

[0060] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, alterations, or equivalent structural transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A double-headed pin puller, characterized in that, It includes a housing (2) with through holes (4) at both ends, and a locking mechanism and an electromagnetic component are provided inside the housing (2); The locking mechanism includes two pull rods (1) with abutment portions (13) and a fixing sleeve (11) fixed in a through hole (4). The two pull rods (1) are partially inserted into the fixing sleeve (11). The fixing sleeve (11) and the through hole (4) form a channel for the pull rods (1) to slide axially. The pull rods (1) are pre-tightened in the channel by the second elastic element (3) and have a tendency to axially displace towards the inside of the channel. The fixing sleeve (11) and the two pull rods (1) are provided with openings (13) in the circumferential direction at corresponding positions. 2) An abutment (10) is provided inside the opening (12), and a sliding sleeve (9) is provided on the outer side of the fixed sleeve (11). The sliding sleeve (9) has a locking position and an unlocking position. When the sliding sleeve (9) is in the locking position, the sliding sleeve (9) constrains the abutment (10) to the position of abutting the abutment (13) to limit the axial displacement of the pull rod (1) to the inside of the channel. When the sliding sleeve (9) is in the unlocking position, the abutment (10) can move away from and release the constraint on the abutment (13). The electromagnetic component includes a drive slider connected to a sliding sleeve (9) for driving the sliding sleeve (9) to switch between a locked position and an unlocked position.

2. The double-headed pin puller according to claim 1, characterized in that, The sliding sleeve (9) includes a pressing part and an unlocking groove. The pressing part protrudes towards the axis of the fixed sleeve (11) relative to the unlocking groove. When the sliding sleeve (9) is in the locked position, the pressing part is aligned with the corresponding opening (12), and the pressing part constrains the abutment (10) to the position of abutting with the abutment (13). When the sliding sleeve (9) is in the unlocked position, the unlocking groove is aligned with the corresponding opening (12), forming a storage space that can accommodate the abutment. The second elastic member (3) pushes the abutment (10) into the storage space.

3. A double-headed pin puller according to claim 1, characterized in that, The electromagnetic component also includes an electromagnetic coil (6) and a yoke (5). The driving slider is an armature (7). The armature (7) is pre-tightened between the yoke (5) and the housing (2) by a first elastic element (8) and moves axially between the yoke (5) and the housing (2) in response to changes in magnetic force. The pre-tightening direction of the first elastic element (8) is opposite to the magnetic attraction direction.

4. A double-headed pin puller according to claim 3, characterized in that, The opposing ends of the yoke (5) and armature (7) are respectively set as inclined surfaces, and the inclination directions of the two inclined surfaces are opposite, forming a symmetrical complementary structure.

5. A double-headed pin puller according to claim 1, characterized in that, The end of the pull rod (1) that extends into the fixed sleeve (11) is provided with a diameter narrowing section (14), and a step is formed between the diameter narrowing section (14) and the pull rod (1) as an abutment part (13).

6. A double-headed pin puller according to claim 5, characterized in that, The diameter narrowing section (14), the abutment part (13), and the pull rod (1) are provided with a transition rounded corner or a transition angle.

7. A double-headed pin puller according to claim 1, characterized in that, The pull rod (1) has a protruding connecting part (16) on one end inside the through hole (4). The second elastic element (3) is sleeved on the pull rod (1), with one end connected to the housing (2) and the other end connected to the connecting part (16).

8. A double-headed pin puller according to claim 7, characterized in that, The through hole (4) has a small diameter section (41) at one end near the fixed sleeve (11), the diameter of which is smaller than the size of the connecting part (16) to restrict the passage of the connecting part (16).

9. A double-headed pin puller according to claim 8, characterized in that, The housing (2) has a slot (20) on the side facing the fixed sleeve (11). The bottom of the slot (20) is penetrated by a small diameter section (41). Both ends of the fixed sleeve (11) extend into the slot (20) and engage with the housing (2).

10. A double-headed pin puller according to any one of claims 1 to 9, characterized in that, The electromagnetic components are provided in two sets, symmetrically arranged on opposite sides of the fixed sleeve (11), and the two driving sliders jointly drive the sliding sleeve (9).

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