A small mining electromagnet

Abstract

The application relates to a small mine electromagnet which comprises a shell, one or more electromagnet devices are mounted on the shell, the electromagnet device comprises a shell body, the shell body is fixedly connected with the shell, an armature assembly is arranged in the shell body, a yoke is arranged at the lower end of the armature assembly, a coil assembly is arranged outside the armature assembly and the yoke, the coil assembly is electrified to drive the armature assembly to move to the side close to the yoke, a reset piece for driving the armature assembly to reset is further arranged on the yoke, a PCBA plate for controlling the on-off of the coil assembly is arranged in the shell, a socket assembly for electrifying the PCBA plate is further arranged on the shell, an end cover assembly is fixedly arranged at the upper end of the shell body, a button mechanism for pushing the armature assembly to move is arranged in the end cover assembly, the button mechanism comprises a stainless steel button and a waterproof cap which are integrally formed by injection molding, and the waterproof cap corresponds to the armature assembly. The application provides a small electromagnet which is excellent in protection performance, convenient to assemble and suitable for mines.

Description

Technical Field

[0001] This application relates to the technical field of electromagnets for electromagnetic pilot valves, and in particular to a small mining electromagnet. Background Technology

[0002] Electromagnetic pilot valves, as core control components in hydraulic support control systems, are widely used in fully mechanized coal mining faces. These electromagnets often operate in harsh environments such as high humidity, high dust, and strong corrosion underground, placing extremely high demands on their protective performance and reliability.

[0003] Existing mining electromagnets typically use plastic caps for end sealing. This structure is prone to aging or damage during long-term use, leading to water ingress into the electromagnet, which can cause short circuits, corrosion, and component damage, affecting the normal operation of the entire hydraulic system.

[0004] Therefore, there is an urgent need to provide a small electromagnet that has excellent protective performance, is easy to assemble, and is suitable for mining environments. Summary of the Invention

[0005] In order to provide a small electromagnet with excellent protective performance, convenient assembly and suitable for mining environment, this application provides a small mining electromagnet.

[0006] The small mining electromagnet provided in this application adopts the following technical solution: A small mining electromagnet includes a housing, on which one or more electromagnet devices are mounted. Each electromagnet device includes a housing, which is fixedly connected to the housing. An armature assembly is disposed within the housing, and a yoke is disposed at the lower end of the armature assembly. A coil assembly is sleeved on the outside of the armature assembly and the yoke. When the coil assembly is energized, it drives the armature assembly to move towards the yoke. A reset element for driving the armature assembly to reset is also disposed on the yoke. A PCBA board for controlling the on / off state of one or more coil assemblies is disposed within the housing. A socket assembly for energizing the PCBA board is also disposed on the housing. An end cap assembly is fixed to the upper end of the housing. A button mechanism for pushing the armature assembly to move is disposed within the end cap assembly. The button mechanism includes an injection-molded stainless steel button and a waterproof cap, which is correspondingly disposed with the armature assembly.

[0007] By adopting the above technical solution, and by installing one or more electromagnets on the outer casing, in conjunction with the internal armature assembly, yoke, coil assembly, PCBA board, and socket assembly, precise control of the electromagnetic pilot valve's operation is achieved. When the coil is energized, it generates an electromagnetic field that drives the armature to engage; upon de-energization, it resets under the action of a reset component. The structure is compact, the response is fast, and it possesses excellent electromagnetic control performance. Combined with the end cap assembly and button mechanism, it facilitates manual operation and provides sealing protection, making it suitable for complex mining environments.

[0008] Preferably, the end cap assembly includes a cover body, the cover body having an clearance hole from bottom to top, the upper end of the armature assembly passing through the clearance hole, the upper end of the cover body having an installation hole, the installation hole communicating with the clearance hole, a boss being formed in the installation hole, the waterproof cap being fitted onto the boss, and a buckle for pressing the waterproof cap onto the boss being provided in the installation hole.

[0009] By adopting the above technical solution, by designing clearance holes and mounting holes on the cover, and setting bosses and buckles in the mounting holes, a stable sealing structure is formed between the waterproof cap and the cover, which can effectively fix the waterproof cap and prevent water and dust from entering. At the same time, the clearance hole structure facilitates the free movement of the armature assembly, ensuring the stability and sealing of the electromagnet operation process.

[0010] Preferably, a dust cover is also provided on the upper side of the cover body, and a pressing groove is provided on the dust cover. The stainless steel button is embedded in the pressing groove, and the stainless steel button and the pressing groove slide and cooperate in the vertical direction.

[0011] By adopting the above technical solution, a dust cover structure is added to the cover body, and a pressing groove is opened on it to embed a stainless steel button. This not only improves the protective performance of the end cover assembly, but also the sliding cooperation design between the button and the pressing groove makes the manual pressing process stable and smooth, improving the overall operational reliability.

[0012] Preferably, the waterproof cap has a horizontally arranged cross-shaped positioning post, and the stainless steel button has a corresponding cross-shaped positioning hole, with the cross-shaped positioning post embedded in the cross-shaped positioning hole.

[0013] By adopting the above technical solution, and by setting a horizontal cross positioning post on the waterproof cap and precisely embedding it with the cross positioning hole on the stainless steel button, the rotation or misalignment of the waterproof cap and the stainless steel button can be effectively prevented, ensuring the stability and consistency of the button's operating direction, and improving the operating accuracy and the stability of the sealing structure.

[0014] Preferably, the outer casing is provided with a circular hole, and one or more circular holes are provided corresponding to the electromagnet device. The circular hole penetrates the outer casing along the height direction. A protrusion is formed on the side wall of the circular hole. The outer casing is inserted into the corresponding circular hole along its own axis and is interference-fitted with the circular hole. One end of the outer casing is also provided with a mounting groove, and the PCBA board is installed in the mounting groove. A connecting hole for connecting wires is also formed inside the outer casing. The connecting hole connects the mounting groove and the circular hole. When there are multiple circular holes on the outer casing, there are correspondingly multiple connecting holes, so that two adjacent circular holes are connected.

[0015] By adopting the above technical solution, a round hole with a raised structure is provided on the outer shell to form an interference fit with the housing of the electromagnet device, ensuring the tightness and convenience of assembly. At the same time, the connecting hole facilitates the electrical connection between the PCBA board in the mounting slot and the electromagnet device, realizing the integrated wiring of the PCBA board, leads and electromagnet. The structure is reasonable, the assembly complexity is reduced and the overall reliability of the electromagnet is improved.

[0016] Preferably, the armature assembly includes an armature block, a push rod is provided on the upper side of the armature block, a top rod is fixed at the lower end of the armature block, the top rod passes through the yoke along its own axis, a step is formed at the lower end of the armature block, and an embedding hole corresponding to the step is provided at the upper end of the yoke. When the electromagnet is in the attracted state, the step is embedded in the embedding hole.

[0017] By adopting the above technical solution, a composite structure including a push rod, an armature block, and a push rod is used. The push rod passes through the yoke and engages with the yoke embedding hole through the armature step during engagement. This ensures that after power is applied, an electromagnetic field is formed around the coil assembly and the yoke to generate electromagnetic attraction on the armature assembly, thus achieving stable engagement and positioning.

[0018] Preferably, the lower end of the yoke is provided with an embedding hole, a first O-ring is sleeved on the top rod and the first O-ring is located in the embedding hole, and a pressure sleeve is also sleeved on the top rod and the pressure sleeve is embedded in the embedding hole. The top rod, the first O-ring and the pressure sleeve slide and engage with each other along their own axial direction.

[0019] By adopting the above technical solution, a reliable sealing and sliding structure is constructed by setting an embedding hole at the lower end of the yoke and configuring a first O-ring and a pressure sleeve. The top rod slides axially within the sealing assembly, which not only realizes the motion function but also ensures the sealing performance of the structure, improves the waterproof performance and durability of the product, and is suitable for high humidity environments in mines.

[0020] Preferably, the coil assembly includes a frame on which enameled wire is wound. The frame includes a base plate formed at the lower end. A winding groove is formed on the side wall of the base plate. A lead-out hole is also formed on the side wall of the housing. The lead-out hole penetrates the housing in any radial direction. The winding groove corresponds to the lead-out hole, and the lead-out hole corresponds to the connecting hole. A lead-out wire is pulled out from the enameled wire. The lead-out wire is embedded in the winding groove from the lower side and passes through the lead-out hole to the connecting hole, until it passes into the mounting groove and is electrically connected to the PCBA board.

[0021] By adopting the above technical solution, a skeleton assembly with a base plate and winding groove structure is used to neatly wind the enameled wire and achieve electrical connection with the PCBA board through the lead wire. This solves the problems of wire pressure and misalignment in the traditional structure. At the same time, the skeleton is precisely connected to the shell and the connecting hole, making the electrical connection process simple and reliable.

[0022] Preferably, a second O-ring is embedded on the lower side of the cover, the lower side of the second O-ring abuts against the upper side of the housing, the diameter of the second O-ring is larger than the diameter of the clearance hole, and the housing and the cover are detachably fixed by bolts.

[0023] By adopting the above technical solution, a second O-ring is set on the lower side of the cover and made to make tight contact with the upper end of the shell. At the same time, it is detachably connected by bolts, which realizes a stable seal and maintainable structure between the end cover and the shell. This not only improves the waterproof and dustproof performance, but also facilitates later maintenance or replacement operations, and improves the overall service life and maintenance convenience.

[0024] Preferably, the push rod is fitted with an upper bearing, which is embedded in the housing, and the push rod is fitted with a lower bearing, which is embedded in the yoke.

[0025] By adopting the above technical solution, upper and lower bearings are respectively installed at the push rod and the push rod, and are embedded in the housing and yoke respectively. This effectively reduces the friction of the armature assembly during movement. At the same time, the upper and lower bearings can guide the movement of the armature assembly, improve the movement accuracy and response speed, extend the service life, and enhance the stability of the electromagnet in high-frequency operating environments.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By arranging one or more electromagnet devices on the same housing and highly integrating them with PCBA boards, socket assemblies, etc., the integrated design of the control unit and the execution unit is realized, which can further reduce the size and weight of the electromagnet and improve portability; combined with the injection-molded stainless steel button and waterproof cap, snap-on installation method and multiple O-ring sealing structure, the overall waterproof and dustproof capabilities of the equipment are significantly improved, making it especially suitable for high humidity and high dust environments such as mines; 2. By adopting a composite structure of push rod, armature block, and push rod, as well as a stepped-embedded hole positioning method, combined with the design of upper and lower bearings and reset components, the electromagnet's attraction process has precise guidance and good response; the optimized wiring method of the coil assembly ensures reliable electrical connection, stable overall movement process, convenient assembly, reduces the occurrence of wire pressing, and is safe and reliable, meeting the requirements of high-frequency operation; 3. The electromagnet housing is installed in the round hole of the outer shell by interference fit, and the interconnecting holes and mounting slots of the integrated wiring are designed to achieve efficient connection of PCBA board, lead wire and socket, simplifying the wiring and assembly process. Attached Figure Description

[0027] Figure 1 This is an isometric view of the overall structure of the small mining electromagnet, which is the main feature of this application embodiment; Figure 2This is an isometric view of the main overall structure of the outer shell in the embodiments of this application; Figure 3 This is a cross-sectional view of the internal structure of a small mining electromagnet, as shown in the embodiments of this application. Figure 4 This is a cross-sectional view that mainly illustrates the internal structure of the electromagnet device in the embodiments of this application; Figure 5 This is an exploded view of the main components of the end cap assembly in the embodiments of this application; Figure 6 This is a cross-sectional view that mainly illustrates the internal structure of the end cap assembly in the embodiments of this application.

[0028] Reference numerals: 1. Housing; 11. Circular hole; 111. Protrusion; 12. Mounting slot; 13. Communicating hole; 14. PCBA board; 15. Nameplate; 16. Socket assembly; 2. Electromagnet device; 21. Housing; 22. Lead-out hole; 3. Armature assembly; 31. Armature block; 311. Positioning slot; 312. Step; 32. Push rod; 321. Upper copper washer; 322. Upper bearing; 33. Push rod; 331. Lower copper washer; 332. Lower bearing; 333. Spring; 334. First O-ring; 335. Pressure sleeve 4. Yoke; 41. Embedded hole; 42. Inserted hole; 43. Third O-ring; 5. Coil assembly; 51. Frame; 511. Base plate; 512. Winding groove; 52. Enamelled wire; 521. Lead wire; 6. End cap assembly; 61. Cover body; 611. Mounting hole; 612. Clearance hole; 613. Boss; 62. Dust cover; 621. Pressing groove; 63. Stainless steel button; 631. Cross positioning hole; 64. Waterproof cap; 641. Cross positioning post; 65. Buckle; 66. Bolt; 67. Second O-ring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] This application discloses a small mining electromagnet.

[0031] See Figures 1-3The small mining electromagnet includes a housing 1 with a circular hole 11 extending through it along its height. One or more circular holes 11 are spaced apart along the length of the housing 1; in this embodiment, two are provided. A mounting groove 12 is also provided at one end of the housing 1 along its length. Connecting holes 13 are provided between the mounting groove 12 and one of the nearby circular holes 11, and between two of the circular holes 11. A PCBA board 14 is housed within the mounting groove 12, and the PCBA board 14 and the wires connected to it are sealed within the mounting groove 12 (the electrical connection between the PCBA board 14 and the wires uses conventional technology; some wire structures are omitted in the figure). A nameplate 15 is detachably fixed to the opening of the mounting groove 12, sealing the mounting groove 12. A socket assembly 16 is also provided on the housing 1, correspondingly positioned on the upper side of the mounting groove 12. The socket assembly 16 is electrically connected to the PCBA board 14, allowing operators to supply power to the PCBA board 14 through the socket assembly 16. The socket assembly 16 can be configured to include a pin, a retaining nut, and a threaded tube structure.

[0032] A protrusion 111 is formed on the side wall of the circular hole 11, and the protrusion 111 is annular. An electromagnet device 2 is installed on the outer shell 1, and one or more electromagnet devices 2 are provided corresponding to the circular hole 11. In this embodiment, two are provided. Each electromagnet device 2 includes a housing 21, which is inserted into the corresponding circular hole 11 along its own axis. The housing 21 and the circular hole 11 are interference-fitted, thereby fixing the housing 21 in the circular hole 11. The protrusion 111 helps to improve the tightness between the housing 21 and the circular hole 11. By integrating the two electromagnet devices 2 onto one outer shell 1, and integrating the socket assembly 16 and the PCBA board 14 into the same outer shell 1, the control unit and the execution unit are integrated into one design, which can further reduce the size and weight of the mining electromagnet.

[0033] See Figures 3-4 An armature assembly 3, a yoke 4, and a coil assembly 5 are respectively installed inside the housing 21. The yoke 4 is located below the armature assembly 3, and the coil assembly 5 is sleeved on the outside of the yoke 4 and the armature assembly 3. The armature assembly 3 includes an armature block 31, and a push rod 32 is formed on the upper end of the armature block 31. The push rod 32 is coaxially arranged with the armature block 31. The push rod 32 passes through the upper side of the housing 21 along its own axis. An upper bearing 322 is also sleeved on the push rod 32. The upper bearing 322 is embedded in the upper end of the housing 21, and the push rod 32 and the upper bearing 322 slide and cooperate along their own axes. An upper copper washer 321 is also sleeved on the push rod 32, and the upper copper washer 321 abuts against the armature block 31.

[0034] The armature block 31 has a positioning groove 311 formed at its bottom. A push rod 33 is coaxially arranged on the lower side of the armature block 31, and a threaded groove is formed on the upper side of the push rod 33. The upper end of the push rod 33 is embedded in the positioning groove 311. Fixing adhesive is filled in the positioning groove 311 and the threaded groove, and the push rod 33 is glued to the armature block 31. The push rod 33 passes through the yoke 4 along its own axis. A lower bearing 332 is also fitted on the push rod 33 and is embedded in the yoke 4. The push rod 33 slides and engages with the lower bearing 332 along its own axis. A lower copper washer 331 is also fitted on the push rod 33 and abuts against the armature block 31. A reset component is also provided in the yoke 4. The reset component is a spring 333, which is fitted on the push rod 33. The two ends of the spring 333 abut against the lower copper washer 331 and the lower bearing 332, respectively. The spring 333 can also limit the armature assembly 3.

[0035] The lower end of the armature block 31 has a step 312, and the yoke 4 has an insertion hole 41 corresponding to the step 312. When the armature block 31 is attracted to the yoke 4, the step 312 is inserted into the insertion hole 41. The step 312 can enhance the attraction force generated by the magnetic field formed on the coil assembly 5 and the yoke 4 on the armature block 31 when energized, thus achieving stable engagement.

[0036] The lower end of the yoke 4 has an insertion hole 42. A first O-ring 334 is fitted onto the push rod 33, and the first O-ring 334 is located inside the insertion hole 42. A pressure sleeve 335 is also fitted onto the push rod 33, and the pressure sleeve 335 is fitted into the insertion hole 42. The pressure sleeve 335 is made of plastic. The push rod 33 slides along its own axis with the first O-ring 334 and the pressure sleeve 335. A third O-ring 43 is also fitted on the outer side of the lower end of the yoke 4. The outer side of the third O-ring 43 protrudes from the side wall of the yoke 4 and abuts against the side wall of the housing 21. The yoke 4 and the side wall of the housing 21 are interference-fitted.

[0037] The coil assembly 5 includes a frame 51 on which enameled wire 52 is wound. The frame 51 includes a base plate 511 formed at its lower end. A winding groove 512 is formed on the side wall of the base plate 511. A lead-out hole 22 is also formed on the side wall of the housing 21. The lead-out hole 22 penetrates the housing 21 in any radial direction. The winding groove 512 corresponds to the lead-out hole 22, and the two lead-out holes 22 correspond to the two connecting holes 13. A lead wire 521 is pulled out from any enameled wire 52. The lead wire 521 is inserted into the winding groove 512 from the lower side, and passes through the lead-out hole 22 to the connecting hole 13, until it passes into the mounting groove 12 and is electrically connected to the PCBA board 14. The lead wire 521 of the electromagnet device 2 on the side of the housing 1 facing away from the mounting groove 12 passes through the lead hole 22 of the housing 21, then through the connecting hole 13 between the two round holes 11, and then through the lead hole 22 of another housing 21. After passing through the corresponding winding groove 512, it emerges from the lead hole 22 on the other side of the housing 21, passes through the connecting hole 13 between the mounting groove 12 and the round hole 11 on the near side, and is electrically connected to the PCBA board 14. Each connecting hole 13 or lead hole 22 is filled with sealant to seal the lead wire 521 inside the hole.

[0038] See Figure 3 , Figure 5 and Figure 6 Each housing 21 is further provided with an end cap assembly 6, which includes a cover body 61. The cover body 61 has a clearance hole 612 formed from bottom to top, and the upper end of the armature assembly 3 passes through the clearance hole 612. The upper end of the cover body 61 has a mounting hole 611, which communicates with the clearance hole 612. A boss 613 is formed in the mounting hole 611. A button mechanism is also provided in the cover body 61. The button mechanism includes a stainless steel button 63 and a waterproof cap 64, which are integrally molded. The lower side of the waterproof cap 64 is correspondingly provided with the push rod 32. A horizontally arranged cross positioning post 641 is formed on the waterproof cap 64, and a corresponding cross positioning hole 631 is formed on the stainless steel button 63. The cross positioning post 641 is embedded in the cross positioning hole 631. The waterproof cap 64 is sleeved on the boss 613, and a buckle 65 for pressing the waterproof cap 64 onto the boss 613 is also provided in the mounting hole 611. The staff can press the stainless steel button 63, which pushes the waterproof cap 64, and then pushes the push rod 32, causing the armature assembly 3 to move towards the side closer to the yoke 4.

[0039] A dust cover 62 is fitted onto the upper side of the cover 61. A pressing groove 621 is formed on the dust cover 62, and a stainless steel button 63 is embedded in the pressing groove 621. The stainless steel button 63 and the pressing groove 621 slide and engage vertically. The housing 21 and the cover 61 are detachably fixed by bolts 66, with the dust cover 62 fitted onto the upper side of the bolts 66. Multiple bolts 66 are arranged in a circumferential array around the axis of the housing 21; in this embodiment, three bolts are provided.

[0040] A second O-ring 67 is also embedded on the lower end face of the cover 61. The lower side of the second O-ring 67 abuts against the upper side of the housing 21. The diameter of the second O-ring 67 is larger than the diameter of the clearance hole 612. Multiple O-rings help to ensure the waterproof and dustproof capability of the electromagnet device 2.

[0041] The implementation principle of a small mining electromagnet according to this application embodiment is as follows: During use, the worker powers the PCBA board 14 through the socket assembly 16. The PCBA board 14 controls whether to power the corresponding coil. When the coil assembly 5 is powered, an electromagnetic field is generated. This electromagnetic field drives the armature assembly 3 to move towards the yoke 4 along its own axis, which is the attraction process. The air gap between the armature block 31 and the yoke 4 decreases until the lower copper pad 331 abuts against the upper surface of the yoke 4, and the armature assembly 3 stops moving. When the PCBA board 14 controls the coil assembly 5 to be de-powered, the electromagnetic field disappears, and the armature block 31 resets to the side away from the yoke 4 under the action of the spring 333. The armature assembly 3 returns to its initial position, which is the recovery process. When manual operation is required, the worker presses the stainless steel button 63 on the corresponding electromagnet, causing the stainless steel button 63 to push the waterproof cap 64 along its axis. The waterproof cap 64 pushes the push rod 32, thereby moving the armature assembly 3 towards the yoke 4.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A small mining electromagnet, characterized in that: The device includes a housing (1), on which one or more electromagnet devices (2) are mounted. Each electromagnet device (2) includes a housing (21), which is fixedly connected to the housing (1). An armature assembly (3) is provided inside the housing (21). A yoke (4) is provided at the lower end of the armature assembly (3). A coil assembly (5) is sleeved on the outside of the armature assembly (3) and the yoke (4). When the coil assembly (5) is energized, it drives the armature assembly (3) to move closer to the yoke (4). A drive armature assembly is also provided on the yoke (4). The reset component (3) is a reset component. The housing (1) is provided with a PCBA board (14) for controlling the on / off state of one or more coil assemblies (5). The housing (1) is also provided with a socket assembly (16) for energizing the PCBA board (14). The upper end of the housing (21) is fixed with an end cap assembly (6). The end cap assembly (6) is provided with a button mechanism for pushing the armature assembly (3) to move. The button mechanism includes an injection-molded stainless steel button (63) and a waterproof cap (64). The waterproof cap (64) is correspondingly provided with the armature assembly (3).

2. The small mining electromagnet according to claim 1, characterized in that: The end cap assembly (6) includes a cover body (61), which has a clearance hole (612) from bottom to top. The upper end of the armature assembly (3) passes through the clearance hole (612). The upper end of the cover body (61) has a mounting hole (611) which communicates with the clearance hole (612). A boss (613) is formed in the mounting hole (611). The waterproof cap (64) is fitted on the boss (613). A buckle (65) for pressing the waterproof cap (64) onto the boss (613) is also provided in the mounting hole (611).

3. A small mining electromagnet according to claim 2, characterized in that: A dust cover (62) is also fitted on the upper side of the cover (61). A pressing groove (621) is provided on the dust cover (62). The stainless steel button (63) is embedded in the pressing groove (621). The stainless steel button (63) and the pressing groove (621) slide and cooperate in the vertical direction.

4. A small mining electromagnet according to claim 1, characterized in that: The waterproof cap (64) has a horizontally arranged cross positioning post (641) formed on it, and the stainless steel button (63) has a corresponding cross positioning hole (631) formed on it. The cross positioning post (641) is embedded in the cross positioning hole (631).

5. A small mining electromagnet according to claim 1, characterized in that: The outer shell (1) is provided with a circular hole (11). One or more circular holes (11) are provided for the electromagnet device (2). The circular hole (11) penetrates the outer shell (1) along the height direction of the outer shell (1). A protrusion (111) is formed on the side wall of the circular hole (11). The housing (21) is inserted into the corresponding circular hole (11) along its own axis and is interference-fitted with the circular hole (11). One end of the outer shell (1) is also provided with a mounting groove (12). The PCBA board (14) is installed in the mounting groove (12). The outer shell (1) is also provided with a connecting hole (13) for connecting wires. The connecting hole (13) connects the mounting groove (12) and the circular hole (11). When there are multiple circular holes (11) on the outer shell (1), there are multiple connecting holes (13) corresponding to each other, so that two adjacent circular holes (11) are connected.

6. A small mining electromagnet according to claim 1, characterized in that: The armature assembly (3) includes an armature block (31), a push rod (32) is provided on the upper side of the armature block (31), a push rod (33) is fixed at the lower end of the armature block (31), the push rod (33) passes through the yoke (4) along its own axis, a step (312) is formed at the lower end of the armature block (31), and an embedding hole (41) corresponding to the step (312) is provided at the upper end of the yoke (4). When the electromagnet is in the attracted state, the step (312) is embedded in the embedding hole (41).

7. A small mining electromagnet according to claim 6, characterized in that: The lower end of the yoke (4) is provided with an embedding hole (42). A first O-ring (334) is sleeved on the top rod (33). The first O-ring (334) is located in the embedding hole (42). A pressure sleeve (335) is also sleeved on the top rod (33). The pressure sleeve (335) is embedded in the embedding hole (42). The top rod (33), the first O-ring (334), and the pressure sleeve (335) slide and cooperate along their own axial direction, respectively.

8. A small mining electromagnet according to claim 5, characterized in that: The coil assembly (5) includes a frame (51) on which an enameled wire (52) is wound. The frame (51) includes a base plate (511) formed at the lower end. A winding groove (512) is formed on the side wall of the base plate (511). A lead-out hole (22) is also formed on the side wall of the housing (21). The lead-out hole (22) penetrates the housing (21) in any radial direction. The winding groove (512) corresponds to the lead-out hole (22). The lead-out hole (22) corresponds to the connecting hole (13). A lead wire (521) is pulled out from the enameled wire (52). The lead wire (521) is embedded into the winding groove (512) from the lower side and passes through the lead-out hole (22) to the connecting hole (13) until it passes into the mounting groove (12) and is electrically connected to the PCBA board (14).

9. A small mining electromagnet according to claim 2, characterized in that: The lower side of the cover (61) is fitted with a second O-ring (67), the lower side of the second O-ring (67) abuts against the upper side of the housing (21), the diameter of the second O-ring (67) is larger than the diameter of the clearance hole (612), and the housing (21) and the cover (61) are detachably fixed by bolts (66).

10. A small mining electromagnet according to claim 6, characterized in that: The push rod (32) is fitted with an upper bearing (322), which is embedded in the housing (21). The push rod (33) is fitted with a lower bearing (332), which is embedded in the yoke (4).

Images