Magnetic adsorption guide pin shaft assembly

Abstract

The utility model relates to the field of pin shafts, and discloses a magnetic adsorption guide pin shaft assembly which comprises a push cylinder, an anti-skid pad, a push rod structure and a guide mechanism, a push plate and an adsorption magnet are arranged on one side of the push cylinder, the anti-skid pad is arranged on the outer wall of the push cylinder, operation and positioning are convenient, and the push rod structure is composed of a rotating cylinder, a fixing block, a sleeve, an ejector rod and the like. Stable stretching and retracting of the ejector rod are achieved through cooperation of a fixing block and a sleeve spiral limiting groove, the stroke of the ejector rod can be adjusted through threaded connection of the sleeve and the shell, the guide mechanism adopts a circular-truncated-cone-shaped replaceable guide pin shaft and is connected with the ejector rod in a sleeved mode through a guide connecting shaft, and the connecting stability is enhanced through connecting magnets distributed circumferentially. According to the assembly, rapid positioning is achieved through magnetic adsorption, the precision and efficiency of pin shaft installation are remarkably improved by combining precise mechanical guiding and an adjustable push rod structure, the installation deviation and the equipment failure risk are effectively reduced, meanwhile, the stability in the using process is enhanced, and the assembly is suitable for various complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of pins, specifically a magnetic adsorption guide pin assembly. Background Technology

[0002] In many fields such as machinery manufacturing and equipment installation, pins play a crucial role as a commonly used positioning and connecting component. Magnetic adsorption guide pin assemblies are pin devices that integrate magnetic adsorption and precise guidance functions. In actual production and equipment assembly processes, it is often necessary to accurately install pins in specific positions to ensure precise fit between mechanical components and normal operation of equipment. Through a unique structural design, magnetic adsorption guide pin assemblies utilize magnetic adsorption to achieve initial positioning of the pins and use a guiding mechanism to ensure precise installation, greatly improving the efficiency and accuracy of pin installation and meeting the needs of modern industry for high-precision and high-efficiency assembly operations.

[0003] However, traditional pin assemblies have some drawbacks in practical applications. First, they lack a precise guiding structure, making it difficult to ensure accurate installation. This leads to pin misalignment during equipment operation. Second, traditional pin assemblies have a limited range of operation methods and are inconvenient to adjust. They cannot flexibly adjust the pin's position and extension length to meet different working scenarios and installation requirements. Furthermore, traditional pin assemblies lack magnetic adsorption, requiring manual support for pin positioning during installation, which is cumbersome and prone to errors. Additionally, the pins are prone to shaking or displacement during equipment operation, affecting the stability and safety of the equipment. Therefore, we propose a magnetic adsorption guiding pin assembly. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a magnetic adsorption guide pin assembly, which solves the aforementioned problems.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a magnetic adsorption guide pin assembly, comprising a push cylinder and an anti-slip pad. The push cylinder has a hollow structure with an opening on one side. A push plate is fixedly installed on the flat side of the push cylinder without an opening. An anti-slip pad is fixedly installed circumferentially on the outer arc surface of the push cylinder. A push rod structure is provided on the push cylinder, and a guide mechanism is provided on the push rod structure.

[0006] Preferably, an adsorption magnet is fixedly installed on the bottom surface of the push plate on the push cylinder.

[0007] Preferably, the push rod structure includes a rotating cylinder, a fixing block, and a guide connecting shaft. The rotating cylinder is a hollow structure with an opening on one side. The guide connecting shaft is fixedly installed on the bottom surface of the rotating cylinder without an opening. The guide connecting shaft is sleeved with the opening on the push cylinder. The fixing block is fixedly installed on the outer arc surface of the rotating cylinder near the side plane where the guide connecting shaft is not installed.

[0008] Preferably, the push rod structure further includes a push rod, a sleeve, a spring, a rotation limiting groove, an external thread, and a guide connecting shaft. The sleeve is fitted onto the rotating cylinder, and a spiral rotation limiting groove is formed on the outer arc surface of the sleeve. The fixing block is tangent to and slidably connected to the rotation limiting groove. An external thread is formed on the outer arc surface of the sleeve away from the rotating cylinder. A disc is fixedly installed on the bottom surface of the push rod, and the guide connecting shaft is fixedly installed on the bottom surface of the disc. The guide connecting shaft on the push rod is sleeved with the rotating cylinder. A spring is fixedly installed on the disc on the push rod corresponding to the periphery of the push rod.

[0009] Preferably, the outer shell has a hollow internal structure, with an internal thread on one side of the inner arc surface of the outer shell, and a stepped block fixedly installed on the other side of the inner arc surface of the outer shell. The internal thread on the outer shell and the external thread on the sleeve are threadedly connected, and the interior of the outer shell and the push rod are coaxially aligned. One end of the push rod protrudes from the plane of the outer shell, and the other end of the spring is fixedly connected to the stepped block inside the outer shell. A hole is opened on the plane of the push rod protruding from the outer shell, and a connecting magnet is fixedly installed circumferentially around the hole on the plane.

[0010] Preferably, the guiding mechanism includes a replaceable guide pin, a connecting magnet, and a guide connecting shaft. The replaceable guide pin is frustum-shaped, and the guide connecting shaft is fixedly mounted on the surface with a larger diameter. A connecting magnet is fixedly mounted circumferentially on the surface with a larger diameter corresponding to the periphery of the guide connecting shaft. The guide connecting shaft on the replaceable guide pin is sleeved with a hole on the top rod, and the connecting magnet on the replaceable guide pin and the connecting magnet on the top rod are magnetically connected.

[0011] Compared with the prior art, the present invention provides a magnetic adsorption guide pin assembly, which has the following advantages:

[0012] 1. The magnetic adsorption guide pin assembly has a replaceable guide pin in the shape of a frustum. It is connected to the top rod through the guide connecting shaft and is magnetically connected by a magnet, ensuring that the pin is accurately installed. This greatly improves the accuracy during installation or use and reduces equipment failure or performance degradation caused by installation deviation.

[0013] 2. In this magnetic adsorption guide pin assembly, the fixed block on the rotating cylinder of the push rod structure is tangentially and slidably connected to the spiral rotation limiting groove of the sleeve. The sleeve is threadedly connected to the outer shell. During operation, pushing the rotating cylinder and utilizing the cooperation between the fixed block and the rotation limiting groove can achieve stable extension and retraction adjustment of the push rod.

[0014] 3. In this magnetic adsorption guide pin assembly, the bottom surface of the push plate of the push cylinder is equipped with an adsorption magnet, and the top rod protruding from the outer shell is also equipped with a connecting magnet. In the pin installation scenario, the adsorption magnet can be adsorbed onto the workpiece for initial positioning, which facilitates subsequent installation operations. The connecting magnet can cooperate with the connecting magnet of the replaceable guide pin to further enhance the stability of the guide. This magnetic adsorption function not only facilitates the installation operation of the pin, but also improves the stability of the pin during use to a certain extent, reducing the possibility of its shaking or displacement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is an exploded view of the present invention.

[0018] In the diagram: 1. Replaceable guide pin; 2. Push rod; 3. Housing; 4. Sleeve; 5. Push cylinder; 6. Anti-slip pad; 7. Rotary cylinder; 8. Fixing block; 9. Adsorption magnet; 10. Spring; 11. Rotation limit groove; 12. Connecting magnet; 13. Internal thread; 14. External thread; 15. Guide connecting shaft. Detailed Implementation

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

[0020] Please see Figure 1-3 A magnetic adsorption guide pin assembly includes a push cylinder 5 and an anti-slip pad 6. The push cylinder 5 has a hollow structure with an opening on one side. A push plate is fixedly installed on the flat side of the push cylinder 5 without an opening. The anti-slip pad 6 is fixedly installed circumferentially on the outer arc surface of the push cylinder 5. A push rod structure is provided on the push cylinder 5, and a guide mechanism is provided on the push rod structure.

[0021] Furthermore, an adsorption magnet 9 is fixedly installed on the bottom surface of the push plate on the push cylinder 5. During operation, the adsorption magnet 9 can not only initially fix the component on the workpiece for easy subsequent installation, but also reduce the overall displacement of the component caused by external force during the pin installation process to a certain extent.

[0022] Furthermore, the push rod structure includes a rotating cylinder 7, a fixing block 8, and a guide connecting shaft 15. The rotating cylinder 7 is a hollow structure with an opening on one side. The guide connecting shaft 15 is fixedly installed on the bottom surface of the rotating cylinder 7 without an opening. The guide connecting shaft 15 is sleeved with the opening on the push cylinder 5. The fixing block 8 is fixedly installed on the outer arc surface of the rotating cylinder 7 near the side plane without the guide connecting shaft 15. During the entire working process, the rotating cylinder 7 not only acts as a connecting component to drive the push rod 2 to move, but its own rotation can also change the overall length of the push rod structure. When the rotating cylinder 7 rotates, the fixing block... 8 slides along the rotation limiting groove 11 on the sleeve 4, thereby pushing the sleeve 4 to move, indirectly realizing the extension and retraction of the push rod 2. When working, the fixing block 8 not only guides the push rod 2 to move stably, but also limits the rotation range of the sleeve 4. Because the fixing block 8 is tangent to and slidably connected to the rotation limiting groove 11, the sleeve 4 can only move along a specific spiral trajectory, preventing it from rotating arbitrarily, thus ensuring the accuracy and stability of the push rod structure movement. In addition to realizing the sleeve connection between components, the guide connecting shaft 15 can also ensure the coaxiality of each component during the movement process.

[0023] Furthermore, the push rod structure also includes a push rod 2, a sleeve 4, a spring 10, a rotation limiting groove 11, an external thread 14, and a guide connecting shaft 15. The sleeve 4 is sleeved on the rotating cylinder 7. The outer arc surface of the sleeve 4 is provided with a spiral rotation limiting groove 11, and the fixing block 8 is tangent to and slidably connected to the rotation limiting groove 11. The outer arc surface of the sleeve 4 away from the rotating cylinder 7 is provided with an external thread 14. A disc is fixedly installed on the bottom surface of the push rod 2, and a guide connecting shaft 15 is fixedly installed on the bottom surface of the disc. The guide connecting shaft 15 on the push rod 2 is sleeved with the rotating cylinder 7. The disc on the push rod 2 is fixedly installed with a spring 10 corresponding to the outer periphery of the push rod 2. During the process of pushing the pin, the connecting magnet 12 protruding from the plane of the outer shell 3 of the push rod 2 not only magnetically connects with the connecting magnet 12 of the replaceable guide pin 1 to enhance stability, but also attracts the pin to a certain extent and assists in the positioning of the pin. Especially for small pins, the weak attraction of the connecting magnet 12 can prevent the pin from accidentally slipping before installation, further improving the convenience and accuracy of installation. During the extension and retraction of the push rod 2, the spring 10, in addition to buffering and resetting, can also absorb the impact force generated during installation to a certain extent. For example, when the pin is inserted into the target position, if there is a momentary impact force, the spring 10 can buffer it through its own elastic deformation, preventing the impact force from being transmitted to other parts of the equipment, protecting the equipment, and making the pin installation more stable.

[0024] Furthermore, the outer shell 3 has a hollow internal structure. An internal thread 13 is provided on the inner arc surface of one side of the outer shell 3, and a stepped block is fixedly installed on the inner arc surface of the other side of the outer shell 3. The internal thread 13 on the outer shell 3 is threadedly connected to the external thread 14 on the sleeve 4. The interior of the outer shell 3 is coaxially aligned with the push rod 2. One end of the push rod 2 protrudes from the plane of the outer shell 3, and the other end of the spring 10 is fixedly connected to the stepped block inside the outer shell 3. A hole is provided on the plane of the push rod 2 protruding from the outer shell 3, and a connecting magnet 12 is fixedly installed in a circular pattern around the hole on the plane.

[0025] Furthermore, the guiding mechanism includes a replaceable guide pin 1, a connecting magnet 12, and a guide connecting shaft 15. The replaceable guide pin 1 is frustum-shaped. The guide connecting shaft 15 is fixedly installed on the larger diameter surface of the replaceable guide pin 1. The connecting magnet 12 is fixedly installed circumferentially on the larger diameter surface of the replaceable guide pin 1, corresponding to the periphery of the guide connecting shaft 15. The guide connecting shaft 15 on the replaceable guide pin 1 is sleeved with the hole on the push rod 2, and the connecting magnet 12 on the replaceable guide pin 1 and the connecting magnet 12 on the push rod 2 are magnetically connected. The frustum-shaped structure of the replaceable guide pin 1, during the guiding process, its tapered design can play a self-centering role for the pin.

[0026] Structural Description:

[0027] Replaceable guide pin 1: The replaceable guide pin 1 is a guide component of the magnetic adsorption guide pin assembly. It is frustum-shaped, with a guide connecting shaft 15 fixedly installed on its larger diameter surface. Magnets 12 are also distributed around it. The guide connecting shaft 15 is sleeved with the hole on the top rod 2. The magnetic connection is achieved by the connecting magnets 12, which provides precise guidance for the pin installation and ensures installation accuracy.

[0028] Push rod 2: Push rod 2 is a key component in the assembly used to push the pin. It has a disc on the bottom surface, and a guide connecting shaft 15 is installed on the bottom of the disc and connected to the rotating cylinder 7. One end protrudes from the plane of the outer shell 3. This plane has an opening and a connecting magnet 12 is installed around it. In the push rod structure, it extends and retracts with the rotation of the rotating cylinder 7 and the action of the spring 10, thereby pushing the pin.

[0029] Outer shell 3: Outer shell 3 has a hollow internal structure. One side of the inner arc surface has an internal thread 13, which is threaded to the external thread 14 of the sleeve 4. The other side of the inner arc surface has a stepped block, which is used to fix the spring 10. Its interior is coaxial with the push rod 2, providing support and protection for the entire push rod structure and ensuring the stable operation of the component.

[0030] Sleeve 4: Sleeve 4 is fitted onto rotating cylinder 7. The outer arc surface has a spiral rotation limiting groove 11, which is tangentially and slidably connected to the fixed block 8. The outer arc surface away from rotating cylinder 7 has an external thread 14. When pushing push cylinder 5, rotating cylinder 7 is driven to move through fixed block 8. The extension and retraction adjustment of push rod 2 is realized by using spring 10 in cooperation with outer shell 3.

[0031] Push cylinder 5: Push cylinder 5 is the basic structure of the component. It has an opening on one side and is hollow inside. The side without an opening has a push plate. Anti-slip pads 6 are installed on the outer arc surface. Adsorption magnets 9 are installed on the bottom surface of the push plate to adsorb workpieces and facilitate the installation of pins. Its opening is sleeved with the guide connecting shaft 15 on the rotating cylinder 7 to provide support and operating force points for the push rod structure.

[0032] Anti-slip pad 6: The anti-slip pad 6 is fixed in a circumferential shape on the outer arc surface of the push cylinder 5. The material has good anti-slip performance. When operating the push cylinder 5, it can increase the friction between the hand and the push cylinder 5, prevent the hand from slipping, and make the operator push the push cylinder 5 more stably, ensuring the safety and stability of the component operation process.

[0033] Rotary cylinder 7: Rotary cylinder 7 is a hollow structure with an opening on one side. The bottom surface is equipped with a guide connecting shaft 15 that is connected to the opening of the push cylinder 5. The outer arc surface is fixedly installed near the side plane. Rotary cylinder 7 plays a connecting and transmission role in the push rod structure. It moves with the push cylinder 5, driving the top rod 2 to extend and retract, thereby realizing the push operation of the pin shaft.

[0034] Fixed block 8: Fixed block 8 is fixed on the outer arc surface of the rotating cylinder 7, and is tangent to and slidably connected to the spiral rotation limiting groove 11 on the outer arc surface of the sleeve 4. When the rotating cylinder 7 rotates, fixed block 8 moves along the rotation limiting groove 11, thereby driving the push rod 2 to move stably and ensuring the stable operation of the push rod structure.

[0035] Adsorption magnet 9: The adsorption magnet 9 is installed on the bottom surface of the push plate of the push cylinder 5. It has strong magnetism and can be adsorbed onto the workpiece during the installation of the pin, so as to initially position the component, facilitate subsequent installation operations, improve installation efficiency and accuracy, and enhance the stability of the pin during use.

[0036] Spring 10: One end of spring 10 is fixed to the outer periphery of the rotating cylinder 7 corresponding to the disk of push rod 2, and the other end is fixed to the stepped block inside the outer shell 3. In the push rod structure, spring 10 plays a role in buffering and resetting. During the extension and retraction of push rod 2, it provides elastic support to ensure that push rod 2 can move stably and reset after operation.

[0037] Rotation limiting groove 11: Rotation limiting groove 11 is opened on the outer arc surface of sleeve 4 and is spiral in shape. It is tangential to and slidably connected to fixed block 8. Through a specific spiral shape, when the rotating cylinder 7 rotates, it guides the movement of fixed block 8, thereby controlling the movement direction and stroke of push rod 2 and ensuring precise adjustment of push rod structure.

[0038] Connecting magnet 12: Connecting magnet 12 is installed around the hole protruding from the plane of the outer shell 3 on the top rod 2 and around the guide connecting shaft 15 with a larger diameter on the replaceable guide pin 1. Through magnetic connection, the connection stability between the replaceable guide pin 1 and the top rod 2 is enhanced, and the pin installation accuracy and guiding effect are further improved.

[0039] Internal thread 13: Internal thread 13 is formed on the inner arc surface on one side of the outer shell 3, which matches the external thread 14 on the outer arc surface of the sleeve 4. Through the threaded connection, the sleeve 4 and the outer shell 3 are tightly fitted.

[0040] External thread 14: External thread 14 is provided on the outer arc surface of sleeve 4 away from rotating cylinder 7, and is threadedly connected to the internal thread 13 of outer casing 3;

[0041] Guide connecting shaft 15: The guide connecting shaft 15 is fixed on the bottom surface of the rotating drum 7 and the surface with the larger diameter of the replaceable guide pin 1. In the assembly, it is used to realize the sleeve connection between the parts, provide guidance for the installation of the pin, ensure that the pin maintains the correct direction during the installation process, and improve the accuracy of the installation.

[0042] Working principle: When in use, first bring the adsorption magnet 9 on the bottom surface of the push cylinder 5 close to the workpiece. The magnetic force generated by the adsorption magnet 9 will initially fix the component on the workpiece, which is convenient for subsequent operations. This adsorption positioning function solves the tedious operation of manual support and positioning when installing traditional pins, improves installation efficiency, and also initially ensures the accuracy of the pin installation position.

[0043] The operator grips the push cylinder 5. The anti-slip pad 6 on the outer arc surface of the push cylinder 5 increases the friction between the hand and the push cylinder 5, making operation more stable. Pushing the push cylinder 5 causes the rotating cylinder 7 to move. The fixing block 8 on the rotating cylinder 7 is tangentially and slidably connected to the spiral-shaped rotation limiting groove 11 on the outer arc surface of the sleeve 4. As the rotating cylinder 7 moves forward, the fixing block 8 slides within the rotation limiting groove 11. Due to the spiral shape of the rotation limiting groove 11, the sleeve 4 moves axially along the rotating cylinder 7. An external thread 14 is formed on the outer arc surface of the sleeve 4 away from the rotating cylinder 7, connecting with the outer casing 3. The internal thread 13 on one side of the inner arc surface is threaded. The movement of the rotating drum 7 will cause the push rod 2 to extend and retract relative to the outer shell 3. The guide connecting shaft 15 on the bottom disc of the push rod 2 is sleeved with the rotating drum 7, and a spring 10 is installed on the outer periphery of the push rod 2 on the disc. The other end of the spring 10 is fixed on the stepped block inside the outer shell 3. The push rod 2 extends and retracts under the drive of the rotating drum 7. At the same time, the spring 10 plays a buffering and restoring role to ensure the stable movement of the push rod 2. In this way, the extension length of the push rod 2 can be flexibly controlled to adapt to different working scenarios and improve work efficiency.

[0044] The guide connecting shaft 15 on the replaceable guide pin 1 is sleeved with the hole on the top rod 2. The magnetic connection of the connecting magnet 12 makes the replaceable guide pin 1 and the top rod 2 connected stably. The frustum-shaped structure of the replaceable guide pin 1 plays a guiding role, which greatly improves the installation accuracy and reduces equipment failure or performance degradation caused by installation deviation.

[0045] The connecting magnet 12 not only enhances the connection stability between the replaceable guide pin 1 and the push rod 2, but also improves the stability of the replaceable guide pin 1 during installation to a certain extent, reducing the possibility of its shaking or displacement.

[0046] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic adsorption guide pin assembly, comprising a push cylinder (5) and an anti-slip pad (6), wherein the push cylinder (5) is a hollow structure with an opening on one side, a push plate is fixedly installed on the flat side of the push cylinder (5) without an opening, and an anti-slip pad (6) is fixedly installed circumferentially on the outer arc surface of the push cylinder (5), characterized in that: The push cylinder (5) is provided with a push rod structure, and the push rod structure is provided with a guide mechanism.

2. The magnetic adsorption guide pin assembly according to claim 1, characterized in that: An adsorption magnet (9) is fixedly installed on the bottom surface of the push plate on the push cylinder (5).

3. The magnetic adsorption guide pin assembly according to claim 2, characterized in that: The push rod structure includes a rotating cylinder (7), a fixing block (8), and a guide connecting shaft (15). The rotating cylinder (7) is a hollow structure with an opening on one side. The guide connecting shaft (15) is fixedly installed on the bottom surface of the rotating cylinder (7) without an opening. The guide connecting shaft (15) is sleeved with the opening on the push cylinder (5). The fixing block (8) is fixedly installed on the outer arc surface of the rotating cylinder (7) near the side plane where the guide connecting shaft (15) is not installed.

4. The magnetic adsorption guide pin assembly according to claim 3, characterized in that: The push rod structure also includes a push rod (2), a sleeve (4), a spring (10), a rotation limiting groove (11), an external thread (14), and a guide connecting shaft (15). The sleeve (4) is sleeved on the rotating cylinder (7). A spiral rotation limiting groove (11) is opened on the outer arc surface of the sleeve (4). The fixed block (8) and the rotation limiting groove (11) are tangent and slidably connected. An external thread (14) is opened on the outer arc surface of the sleeve (4) away from the rotating cylinder (7). A disc is fixedly installed on the bottom surface of the push rod (2). The guide connecting shaft (15) is fixedly installed on the bottom surface of the disc. The guide connecting shaft (15) on the push rod (2) is sleeved with the rotating cylinder (7). A spring (10) is fixedly installed on the disc on the push rod (2) corresponding to the periphery of the push rod (2).

5. A magnetic adsorption guide pin assembly according to claim 4, characterized in that: The outer shell (3) has a hollow structure. An internal thread (13) is provided on the inner arc surface of one side of the outer shell (3). A stepped block is fixedly installed on the inner arc surface of the other side of the outer shell (3). The internal thread (13) on the outer shell (3) and the external thread (14) on the sleeve (4) are threadedly connected. The interior of the outer shell (3) and the top rod (2) are coaxially aligned. One end of the top rod (2) protrudes from the plane of the outer shell (3). The other end of the spring (10) is fixedly connected to the stepped block inside the outer shell (3). A hole is provided on the plane of the top rod (2) protruding from the outer shell (3). A connecting magnet (12) is fixedly installed in a circle around the hole on the plane.

6. A magnetic adsorption guide pin assembly according to claim 5, characterized in that: The guiding mechanism includes a replaceable guide pin (1), a connecting magnet (12), and a guide connecting shaft (15). The replaceable guide pin (1) is frustum-shaped. The guide connecting shaft (15) is fixedly installed on the larger diameter surface of the replaceable guide pin (1). The connecting magnet (12) is fixedly installed in a circular pattern on the larger diameter surface of the replaceable guide pin (1) corresponding to the periphery of the guide connecting shaft (15). The guide connecting shaft (15) on the replaceable guide pin (1) is sleeved with the hole on the top rod (2), and the connecting magnet (12) on the replaceable guide pin (1) and the connecting magnet (12) on the top rod (2) are magnetically connected.

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