Electromagnetic holding type electromagnet

Abstract

The invention provides an electromagnetic holding type electromagnet, and belongs to the technical field of electromagnets. The electromagnetic coil is fixed on the inner wall of the shell; the sleeve is fixed in the electromagnetic coil, two pieces of annular magnetic steel are fixed on the sleeve, the two pieces of annular magnetic steel are arranged and distributed in the length direction of the sleeve, and like magnetic poles of the two pieces of annular magnetic steel are oppositely arranged; the movable iron core is located in the sleeve, and the movable iron core slides in the length direction of the sleeve; the output shaft is fixedly connected with the movable iron core; the limiting assemblies are located at the two ends of the sleeve and used for limiting the sliding distance of the movable iron core in the sleeve. According to the processing scheme, the electromagnet can still be attracted after being powered on and attracted, the electric energy loss is small, and the reliability is high.

Description

Technical Field

[0001] The present application relates to the field of electromagnets, and in particular to an electromagnetic holding electromagnet. Background Art

[0002] Electromagnets are mostly used to control the on and off of internal circuits in important equipment, which requires them to have good functional characteristics and reliability. In addition, the demand for electromagnets is increasing. After the iron core of an electromagnet with traditional structure is energized, it needs to be continuously energized to keep it attracted, resulting in large energy loss. When the power is off, it is reset by spring tension, and has a short service life. Summary of the invention

[0003] In view of this, the present application provides an electromagnetic holding electromagnet, which solves the problems in the prior art. The electromagnet of the present application can remain attracted after being energized and then de-energized, with low power loss and high reliability.

[0004] The electromagnetic holding electromagnet provided in this application adopts the following technical solution:

[0005] An electromagnetic holding electromagnet, comprising:

[0006] case;

[0007] An electromagnetic coil is fixed on the inner wall of the shell;

[0008] A sleeve is fixed in the electromagnetic coil, and two annular magnetic steels are fixed on the sleeve. The two annular magnetic steels are arranged and distributed along the length direction of the sleeve, and the like magnetic poles of the two annular magnetic steels are arranged opposite to each other;

[0009] A moving iron core is located in the sleeve, and the moving iron core slides along the length direction of the sleeve;

[0010] An output shaft, fixedly connected to the moving iron core;

[0011] Limiting components, located at both ends of the sleeve, for limiting the sliding distance of the moving iron core in the sleeve;

[0012] In which, a forward current is passed through the electromagnetic coil, the magnetic force of the electromagnetic coil and the magnetic force of the first annular magnet are superimposed, and the magnetic force of the electromagnetic coil and the magnetic force of the second annular magnet are partially or completely offset, so that the moving iron core is close to the first annular magnet. After the electromagnetic coil is powered off, the moving iron core is stabilized on the side of the first annular magnet; a reverse current is passed through the electromagnetic coil, the magnetic force of the electromagnetic coil and the magnetic force of the second annular magnet are superimposed, and the magnetic force of the electromagnetic coil and the magnetic force of the first annular magnet are partially or completely offset, so that the moving iron core is close to the second annular magnet. After the electromagnetic coil is powered off, the moving iron core is stabilized on the side of the second annular magnet.

[0013] Optionally, a closing block integral with the shell is provided at one end of the shell, the closing block is provided with a through hole for one end of the output shaft to pass through, a removable rear end cover is provided at the other end of the shell, the sleeve is located between the closing block and the rear end cover, a sliding recessed hole that slides with the output shaft is provided on the end surface of the rear end cover facing the closing block, an exhaust hole connected to the sliding recessed hole is provided on the rear end cover, and the exhaust hole passes through the circumferential side wall of the rear end cover body.

[0014] Optionally, a copper sleeve is provided on the inner walls of the through hole and the sliding recessed hole, and the inner wall of the copper sleeve is in sliding contact with the outer wall of the output shaft.

[0015] Optionally, bosses extending into the sleeve are provided on the opposite sides of the closing block and the rear end cover, the bosses cooperate with the inner wall of the sleeve, the end faces of the closing block and the rear end cover on the outer periphery of the bosses abut against the end face of the sleeve, the bosses serve as the limiting components, and the bosses are used to abut against the end face of the moving iron core.

[0016] Optionally, shock-absorbing pads are provided on both end surfaces of the moving iron core, and the shock-absorbing pads are used to contact the end surface of the boss.

[0017] Optionally, the sleeve is a steel sleeve, and the annular magnetic steel is adhered to the outer circumference of the sleeve.

[0018] Optionally, washers are provided on the outer periphery of both ends of the sleeve, and the annular magnetic steel is located between the washers at both ends.

[0019] Optionally, the shell is a magnetic conductor.

[0020] In summary, this application includes the following beneficial technical effects:

[0021] The electromagnet of the present application can remain attracted after being energized and attracted and then de-energized, with little power loss, and the movement of the iron core is controlled by magnetizing and demagnetizing the permanent magnet, with low mechanical loss and high reliability.

[0022] Add shock-absorbing pads on both sides of the moving iron core to reduce the impact force during the movement of the moving iron core. Add copper sleeves on the front end and rear cover of the housing as sliding bearings to ensure reliable movement of the output shaft.

[0023] When the electromagnet is assembled as a whole, the shell and the rear cover of the shell are drilled as a whole, and heavy straight slot elastic cylindrical pins are installed to prevent the rear cover from falling off when the iron core hits multiple times. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of the electromagnetic holding electromagnet of the present application;

[0026] Figure 2 A schematic diagram of the cross-sectional structure of the electromagnetic holding electromagnet of the present application from another perspective;

[0027] Figure 3 This is a schematic diagram of the structure of the shell of this application;

[0028] Figure 4 This is a schematic diagram of the structure of the sleeve, gasket and annular magnetic steel of this application.

[0029] Explanation of the reference numerals: 1. Shell; 11. Closing block; 12. Rear end cover; 13. Boss; 14. Through hole; 15. Sliding recess; 16. Exhaust hole; 17. Copper sleeve; 18. Positioning hole; 19. Heavy straight slot vertical elastic pin; 2. Electromagnetic coil; 3. Sleeve; 31. Washer; 4. Ring magnet; 5. Moving iron core; 51. Shock-absorbing pad; 6. Output shaft. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0032] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0033] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0034] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0035] An embodiment of the present application provides an electromagnetic holding electromagnet.

[0036] like Figures 1 to 4 As shown, an electromagnetic holding electromagnet comprises: a shell 1; an electromagnetic coil 2, fixed on the inner wall of the shell 1; a sleeve 3, fixed in the electromagnetic coil 2, two annular magnets 4 are fixed on the sleeve 3, the two annular magnets 4 are arranged and distributed along the length direction of the sleeve 3, and the like magnetic poles of the two annular magnets 4 are arranged opposite to each other; a moving iron core 5, located in the sleeve 3, and the moving iron core 5 slides along the length direction of the sleeve 3; an output shaft 6, fixedly connected to the moving iron core 5; a limit assembly, located at both ends of the sleeve 3, for limiting the sliding distance of the moving iron core 5 in the sleeve 3.

[0037] A positive current is passed through the electromagnetic coil 2, and the magnetic force of the electromagnetic coil 2 is superimposed on the magnetic force of the first annular magnet 4, and the magnetic force of the electromagnetic coil 2 and the magnetic force of the second annular magnet 4 are partially or completely offset, so that the moving iron core 5 is close to the first annular magnet 4. After the electromagnetic coil 2 is powered off, the moving iron core 5 is close to the first annular magnet 4, and the suction force of the first annular magnet 4 on the moving iron core 5 is greater than the suction force of the second annular magnet 4, so that the moving iron core 5 is stabilized on the side of the first annular magnet 4.

[0038] A reverse current is passed through the electromagnetic coil 2, and the magnetic force of the electromagnetic coil 2 is superimposed on the magnetic force of the second annular magnet 4, and the magnetic force of the electromagnetic coil 2 and the magnetic force of the first annular magnet 4 are partially or completely offset, so that the moving iron core 5 is close to the second annular magnet 4. After the electromagnetic coil 2 is powered off, the moving iron core 5 is close to the second annular magnet 4, and the suction force of the second annular magnet 4 on the moving iron core 5 is greater than the suction force of the first annular magnet 4, so that the moving iron core 5 is stabilized on the side of the second annular magnet 4.

[0039] One end of the housing 1 is provided with a closing block 11 which is integral with the housing 1, and the closing block 11 covers one end of the housing 1. The closing block 11 is provided with a through hole 14 for one end of the output shaft 6 to pass through. The other end of the housing 1 is provided with a detachable rear end cover 12, and the rear end cover 12 covers the other end of the housing 1. The sleeve 3 is located between the closing block 11 and the rear end cover 12. The rear end cover 12 is provided with a sliding concave hole 15 which is slidably matched with the output shaft 6 on the end surface facing the closing block 11. The rear end cover 12 is provided with an exhaust hole 16 which is connected with the sliding concave hole 15, and the exhaust hole 16 passes through the circumferential side wall of the rear end cover 12. To maintain the stability of the sleeve 3, the gap between the sleeve 3 and the rear end cover 12 is very small or glued. The present application uses the exhaust hole 16 to make the sliding concave hole 15 communicate with the outside through the gap between the rear end cover 12 and the housing 1, so as to keep the pressure in the sliding concave hole 15 consistent with the external atmospheric pressure, and ensure that the moving iron core 5 of the electromagnet has small resistance and fast response speed when it moves.

[0040] A copper sleeve 17 is provided on the inner wall of the through hole 14 and the sliding recessed hole 15, and the inner wall of the copper sleeve 17 is in sliding contact with the outer wall of the output shaft 6. The copper sleeve 17, as a sliding bearing, can reduce the friction between the output shaft 6 and the rear end cover 12, and between the output shaft 6 and the closing block 11, and ensure the smooth sliding of the output shaft 6. The copper sleeve 17 is fitted with the housing 1 and the rear cover of the housing 1 by interference fit to prevent the copper sleeve 17 from falling off. The copper sleeve 17 is made of bronze with good wear resistance, which can reduce the friction between the shaft and the copper sleeve 17. At the same time, the copper sleeve 17 is hardened to prevent the copper sleeve 17 from deforming during repeated friction.

[0041] Bosses 13 extending into the sleeve 3 are provided on the opposite sides of the closing block 11 and the rear end cover 12, and the inner wall of the sleeve 3 is matched with the boss 13. The end faces of the closing block 11 and the rear end cover 12 on the periphery of the boss 13 abut against the end face of the sleeve 3. The boss 13 serves as the limiting component. The boss 13 is used to abut against the end face of the moving iron core 5. The distance between the boss 13 of the closing block 11 and the boss 13 on the rear end cover 12 is greater than the length of the moving iron core 5, providing sufficient space for the sliding of the moving iron core 5, and the mating surfaces of the two annular magnets 4 in the centers of the two bosses 13 are aligned.

[0042] Shock-absorbing pads 51 are provided on both end surfaces of the moving iron core 5, and the shock-absorbing pads 51 are used to contact the end surfaces of the bosses 13. When the moving iron core 5 moves back and forth and hits the closing block 11 and the rear end cover 12, the shock-absorbing pads 51 are compressed to reduce the impact force of the moving iron core 5 when it hits, which can effectively improve the service life of the electromagnet. At the same time, the shock-absorbing pads 51 are made of materials with good elasticity and moderate hardness, so that they can reduce the impact force and are not easy to be damaged.

[0043] The sleeve 3 is a steel sleeve, and the annular magnetic steel 4 is pasted on the outer periphery of the sleeve 3. Washers 31 are provided on the outer periphery of both ends of the sleeve 3. The material of the washers 31 is hard plastic, and the annular magnetic steel 4 is located between the washers 31 at both ends. The design of the washers 31 ensures the structural strength and prevents the magnetic steel from being damaged. In order to achieve positive power attraction and reverse power reset, the magnetic steel is installed with the same poles facing each other. Since opposite repulsion will be generated, it is firmly bonded by epoxy glue and clamped by a clamp until the magnetic steel is completely fixed.

[0044] The housing 1 adopts an integrated housing 1, that is, the closing block 11, the boss 13 on the closing block 11 and the housing 1 are integrally arranged to ensure that the housing 1 is firm when the moving iron core 5 hits repeatedly. The housing 1 adopts a magnetic conductive structure, which can make the magnetic field of the permanent magnet form a closed loop through the housing 1, thereby increasing the electromagnetic holding force. At the same time, four positioning holes 18 are opened on the rear side of the housing 1 to facilitate the drilling and installation of heavy straight groove vertical elastic pins 19 for connecting the housing 1 and the rear end cover 12. The housing 1 and the rear end cover 12 are fixed by heavy straight groove vertical elastic pins 19, which do not have the nail cap of ordinary screws, so that the outer diameter of the electromagnet after installation meets the requirements and there is no high point higher than the housing 1. At the same time, it has a certain elasticity and hardness, which can ensure that the rear cover of the housing 1 will not fall off when it is hit by multiple movements.

[0045] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An electromagnetic holding electromagnet, characterized in that: include: Housing (1); An electromagnetic coil (2) is fixed on the inner wall of the housing (1); A sleeve (3) is fixed inside the electromagnetic coil (2), and two annular magnetic steels (4) are fixed on the sleeve (3), the two annular magnetic steels (4) are arranged and distributed along the length direction of the sleeve (3), and the like magnetic poles of the two annular magnetic steels (4) are arranged opposite to each other; A moving iron core (5) is located in the sleeve (3), and the moving iron core (5) slides along the length direction of the sleeve (3); An output shaft (6) is fixedly connected to the moving iron core (5); Limiting components, located at both ends of the sleeve (3), and used to limit the sliding distance of the moving iron core (5) in the sleeve (3); Wherein, when a positive current is passed through the electromagnetic coil (2), the magnetic force of the electromagnetic coil (2) and the magnetic force of the first annular magnetic steel (4) are superimposed, and the magnetic force of the electromagnetic coil (2) and the magnetic force of the second annular magnetic steel (4) are partially or completely offset, so that the moving iron core (5) is close to the first annular magnetic steel (4), and after the electromagnetic coil (2) is powered off, the moving iron core (5) is stabilized on the side of the first annular magnetic steel (4); when a reverse current is passed through the electromagnetic coil (2), the magnetic force of the electromagnetic coil (2) and the magnetic force of the second annular magnetic steel (4) are superimposed, and the magnetic force of the electromagnetic coil (2) and the magnetic force of the first annular magnetic steel (4) are partially or completely offset, so that the moving iron core (5) is close to the second annular magnetic steel (4), and after the electromagnetic coil (2) is powered off, the moving iron core (5) is stabilized on the side of the second annular magnetic steel (4).

2. The electromagnetic holding electromagnet according to claim 1, characterized in that: A closing block (11) which is integral with the shell (1) is provided at one end of the shell (1), and a through hole (14) is provided on the closing block (11) for one end of the output shaft (6) to pass through. A detachable rear end cover (12) is provided at the other end of the shell (1). The sleeve (3) is located between the closing block (11) and the rear end cover (12). A sliding recessed hole (15) which is slidably matched with the output shaft (6) is provided on the end surface of the rear end cover (12) facing the closing block (11). An exhaust hole (16) which is connected to the sliding recessed hole (15) is provided on the rear end cover (12), and the exhaust hole (16) passes through the circumferential side wall of the rear end cover (12).

3. The electromagnetic holding electromagnet according to claim 2, characterized in that: A copper sleeve (17) is provided on the inner walls of the through hole (14) and the sliding recessed hole (15), and the inner wall of the copper sleeve (17) is in sliding contact with the outer wall of the output shaft (6).

4. The electromagnetic holding electromagnet according to claim 2, characterized in that: The closing block (11) and the rear end cover (12) are provided with bosses (13) extending into the sleeve (3) on the opposite sides thereof. The bosses (13) cooperate with the inner wall of the sleeve (3). The end faces of the closing block (11) and the rear end cover (12) on the periphery of the boss (13) abut against the end face of the sleeve (3). The boss (13) serves as the limiting component and is used to abut against the end face of the moving iron core (5).

5. The electromagnetic holding electromagnet according to claim 4, characterized in that: Shock-absorbing pads (51) are provided on both end surfaces of the moving iron core (5), and the shock-absorbing pads (51) are used to contact the end surface of the boss (13).

6. The electromagnetic holding electromagnet according to claim 1, characterized in that: The sleeve (3) is a steel sleeve, and the annular magnetic steel (4) is adhered to the outer circumference of the sleeve (3).

7. The electromagnetic holding electromagnet according to claim 1, characterized in that: Washers (31) are provided on the outer periphery of both ends of the sleeve (3), and the annular magnetic steel (4) is located between the washers (31) at the two ends.

8. The electromagnetic holding electromagnet according to claim 1, characterized in that: The shell (1) is a magnetic conductor.

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