A linear motor and a component transfer device

Abstract

The present invention discloses a linear motor and a component transfer device, relating to the technical field of linear motors, and comprising a base; a guide rail; a linear slider; a mover; an armature; a magnet; a moving seat; a magnetic conductive strip plate installed on the surface of the base, the number of magnetic conductive strip plates being the same as the number of guide rails; and an electromagnet embedded in the moving seat, the electromagnet being arranged corresponding to the magnetic conductive strip plate. In the present invention, when the electromagnet is energized to generate magnetism, a magnetic attraction force is generated on the magnetic conductive strip plate. Under the action of the magnetic attraction force, the mover can be subjected to a force towards the base direction, so that the linear slider can maintain contact with the surface of the guide rail. Thus, when the balls on the guide rail or the linear slider are worn, the air gap between the armature and the magnet will not become too large, and the air gap tends to be uniform, improving the output accuracy of the linear motor. In addition, since the electromagnet and the surface of the magnetic conductive strip plate do not contact, the wear generated is small and no resistance will be generated in the moving direction of the mover.

Description

Technical Field

[0001] The present invention relates to the technical field of linear motors, and particularly to a linear motor and a component transfer device. Background Art

[0002] A linear motor (or linear motor) can directly convert electrical energy into linear motion without any intermediate conversion mechanism of the transmission device. A linear motor generally consists of a base, an armature, a magnet, a guide rail, and a mover.

[0003] In the prior art, the linear motor realizes linear motion by sliding a linear slider on the guide rail. In addition, the gap between the armature and the magnet, that is, the air gap, needs to be kept uniform. The size of the air gap directly affects the magnetic flux density. The smaller the air gap, the generally larger the magnetic flux density, because the magnetic force lines are more likely to pass through the smaller gap. The increased magnetic flux density can improve the torque and output power of the motor. The size and consistency of the air gap are crucial for the efficiency and output of the linear motor. Too small an air gap may cause mechanical friction or collision between the magnet and the armature, while too large an air gap may reduce the efficiency of the magnetic flux and the force generated by the motor. Therefore, when designing a linear motor, it is necessary to carefully consider the size of the air gap to ensure that the motor can work efficiently and reliably.

[0004] During the long-term use of the linear slider and the guide rail, wear inevitably occurs. For example, after the steel balls in the linear slider are worn, the connection between the steel balls and the guide rail is not tight, so that the linear slider and the guide rail may become loose. When the looseness is large, the mover may displace relative to the base, which may in turn cause the air gap between the armature and the magnet to become larger or smaller (if the connection surface of the mover with the external transfer device faces downward, the air gap will become larger, and vice versa), making the air gap uneven, thereby affecting the output of the linear motor. Summary of the Invention

[0005] The purpose of the present invention is to provide a linear motor and a component transfer device to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A linear motor, comprising:

[0008] A base;

[0009] A mover horizontally slidably connected to the surface of the base by installing two guide rails and a linear slider;

[0010] An armature provided on the outer wall of the mover facing the base, and a magnet cooperating with the armature is provided on the surface of the base;

[0011] A moving seat connected to the mover;

[0012] A magnetic conductive strip plate installed on the surface of the base, the number of the magnetic conductive strip plates being the same as the number of the guide rails;

[0013] An electromagnet embedded in the moving seat, the electromagnet being arranged corresponding to the magnetic conductive strip plate.

[0014] Through the above technical solution, when the electromagnet is energized, magnetism is generated, and then a magnetic attraction force is generated on the magnetic conductive strip plate. Under the action of the magnetic attraction force, the mover can be subjected to a force towards the base direction, so that the linear slider can maintain contact with the surface of the guide rail. Thus, when the balls on the guide rail or the linear slider are worn, the air gap between the armature and the magnet will not become too large, and the air gap tends to be uniform, improving the output precision of the linear motor. In addition, since the electromagnet and the surface of the magnetic conductive strip plate do not contact, the generated wear is small and no resistance is generated in the moving direction of the mover.

[0015] Further, two magnetic shielding plates are fixedly connected to one side of the moving seat facing the base, and the two magnetic shielding plates respectively correspond to both sides in the width direction of the magnetic conductive strip plate.

[0016] Through the above technical solution, the magnetic shielding plates can prevent the magnetic field of the electromagnet from affecting the magnetic field between the armature and the magnet.

[0017] Further, vertical plates are respectively connected to the outer walls on both sides of the base corresponding to the moving direction of the mover. A limiting pin is horizontally penetrated through the outer wall of the vertical plate. End caps are respectively connected to the outer walls on both sides of the mover, and the two end caps are respectively used in cooperation with the limiting pins on the two vertical plates.

[0018] Through the above technical solution, after the mover moves in place, the limiting pin contacts the surface of the end cap, thereby limiting the movement of the mover.

[0019] Further, wing plates are integrally formed on the outer walls on both sides of the mover corresponding to the width direction of the guide rail. The linear slider is connected to the surface of one side of the wing plate facing the base, and the moving seat is connected to the surface of the wing plate.

[0020] Through the above technical solution, by providing the wing plates, the thickness dimension of the mover can be minimized as much as possible during design, so that the mass of the mover is reduced, and thus the inertia during movement can be reduced.

[0021] Further, the electromagnet is located directly above the magnetic conductive strip plate, and the moving seat is connected to the middle position of the wing plate.

[0022] Through the above technical solution, the magnetic attraction forces of the two electromagnets on the magnetic conductive strip plate can act symmetrically on the mover, so that the contact between the linear sliders on the two guide rails and the guide rails can be uniform.

[0023] Furthermore, an installation base is connected to the top of the moving seat. An installation arm is vertically penetrated through the surface of the installation base. One end of the installation arm away from the installation base is rotatably connected with a roller. A receiving cavity is formed in the side wall of the base. A floating light plate is engaged in the receiving cavity. The floating light plate can move freely up and down in the receiving cavity. The roller is in rolling contact with the surface of the floating light plate. The floating light plate and the magnetic conduction strip plate are connected through a buffer structure.

[0024] Through the above technical solution, the roller rolls on the surface of the floating light plate. When one linear slider wears more than the other linear slider, the mover deflects, and then the extrusion force of one roller on the corresponding surface of the floating light plate increases, causing the roller to squeeze the floating light plate. The floating light plate will drive the magnetic conduction strip plate to move towards the inner side of the base. Since the lateral spacing dimension between the floating light plate and the guide rail is larger than the lateral spacing between the electromagnet and the guide rail, the downward movement amplitude of the floating light plate is larger. As a result, the spacing between the magnetic conduction strip plate and the electromagnet increases. After the spacing increases, the magnetic attraction force of the electromagnet on the magnetic conduction strip plate on this side will decrease, and the magnetic attraction force of the electromagnet on the magnetic conduction strip plate on the other side will increase, thereby being able to force the mover to deflect in the reverse direction, achieving the self-balancing of the mover and minimizing the air gap change amount between the armature and the magnet to the greatest extent.

[0025] Furthermore, the buffer structure includes a connecting pin vertically and fixedly penetrated through the floating light plate. The connecting pin is slidably penetrated through the base. A through hole for the free passage of the connecting pin is formed on the surface of the magnetic conduction strip plate. An elastic member is provided between the surface of the magnetic conduction strip plate and the base. The elastic member endows the magnetic conduction strip plate with the potential energy to move towards the side away from the base. A limit nut is threadedly sleeved on the end of the connecting pin protruding out of the magnetic conduction strip plate.

[0026] Through the above technical solution, by setting the limit nut and the elastic member, the gap between the electromagnet and the magnetic conduction strip plate can be adjusted during assembly to ensure that the gaps between the electromagnets and the magnetic conduction strip plate on both sides are consistent.

[0027] Furthermore, the elastic member includes a spring wound around the periphery of the connecting pin. The two ends of the spring elastic force direction elastically abut against the surface of the magnetic conduction strip plate and the base respectively.

[0028] Through the above technical solution, the spring maintains the pre-pressure on the magnetic conduction strip plate, enabling the floating light plate to maintain a stable position after moving up and down in the receiving cavity in place.

[0029] Furthermore, both the surfaces of the roller and the floating light plate are chrome-plated.

[0030] Through the above technical solution, the friction and wear on the surfaces of the roller and the floating light plate are reduced.

[0031] A component transfer device includes the linear motor as described above.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. In the present invention, when the electromagnet is energized, it generates magnetism, and then generates a magnetic suction force on the magnetic conductive strip plate. Under the action of the magnetic suction force, the mover can be subjected to a force towards the base direction, so that the linear slider can maintain contact with the surface of the guide rail. Thus, when the balls on the guide rail or the linear slider are worn, the change amount of the air gap between the armature and the magnet will not be too large, and the air gap tends to be uniform, improving the output accuracy of the linear motor.

[0034] 2. In the present invention, the roller rolls on the surface of the floating optical plate. When one side of the linear slider is worn more than the other side, the mover deflects, and then the extrusion force of one roller pair on the corresponding surface of the floating optical plate increases, causing the roller to squeeze the floating optical plate. The floating optical plate will drive the magnetic conductive strip plate to move towards the inner side of the base. Since the lateral spacing dimension between the floating optical plate and the guide rail is larger than the lateral spacing between the electromagnet and the guide rail, the downward movement amplitude of the floating optical plate is larger. As a result, the spacing between the magnetic conductive strip plate and the electromagnet increases. After the spacing increases, the magnetic suction force of the electromagnet on the magnetic conductive strip plate on this side will decrease, and the magnetic suction force of the electromagnet on the other side on the magnetic conductive strip plate will increase, thereby being able to force the mover to deflect in the reverse direction, achieving the self - balance of the mover and minimizing the change amount of the air gap between the armature and the magnet to the greatest extent.

[0035] 3. In the present invention, the limit nut and the elastic member are provided, which can adjust the gap between the electromagnet and the magnetic conductive strip plate during assembly to ensure that the gaps between the electromagnets on both sides and the magnetic conductive strip plate are consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of a linear motor in the present invention;

[0037] Figure 2 is Figure 1 a schematic diagram of the positional relationship from the first perspective in

[0038] Figure 3 is Figure 1 a schematic diagram of the positional relationship from the second perspective in

[0039] Figure 4 is Figure 3 an enlarged schematic diagram of the partial structure at A in

[0040] Figure 5 is a schematic diagram of the positional relationship after the assembly of the mover, the guide rail and the floating optical plate in the present invention;

[0041] Figure 6 is Figure 5 a schematic diagram of the positional relationship from another perspective in

[0042] Figure 7 a schematic diagram of the positional relationship after the floating light plate, the magnetically conductive strip plate and the moving seat in the present invention are assembled;

[0043] Figure 8 is Figure 7 a schematic diagram of the positional relationship from another perspective in

[0044] Figure 9 is Figure 7 an exploded view of the structure in

[0045] In the figure, the description of each reference numeral is as follows: 1. base; 2. floating light plate; 3. magnetically conductive strip plate; 4. wing plate; 5. mounting arm; 6. mounting seat; 7. linear slider; 8. magnet; 9. limit pin; 10. vertical plate; 11. mover; 12. moving seat; 13. end cover; 14. guide rail; 15. roller; 16. limit nut; 17. accommodating cavity; 18. armature; 19. spring; 20. connecting pin; 21. electromagnet. Specific embodiments

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0047] Please refer to Figure 1 - Figure 9, the present invention provides a technical solution: a component transfer device, including a linear motor. The linear motor includes a base 1 mounted on an external component transfer device. On both sides of the base 1 in the width direction, a guide rail 14 is horizontally connected. The length direction of the guide rail 14 is the same as the length direction of the base 1. And two linear sliders 7 are respectively and cooperatively mounted on each guide rail 14. Two linear sliders 7 on the same guide rail 14 are commonly connected to a wing plate 4. The opposite surfaces of the two wing plates 4 are commonly fixedly connected with a U-shaped mover 11. A plurality of screw holes are formed at the top of the mover 11, and these screw holes are used for connecting with an external transfer device (such as a suction nozzle, a suction cup, etc.). On the outer wall of the side of the mover 11 facing the base 1, an armature 18 is mounted. And a plurality of magnets 8 with an even number are provided on the top of the base 1. These magnets 8 are arranged at equal intervals along the length direction of the base 1, and the sides facing the mover 11 are alternately set as N poles and S poles. The magnets 8 are used in cooperation with the armature 18, and the longitudinal gap between their opposite surfaces is called an air gap. Further, the wing plate 4 and the mover 11 can be set as an integrally formed structure, which is convenient for the installation of the mover 11. In addition, such a setting can minimize the mass of the mover 11, thereby reducing the inertia when the mover 11 moves;

[0048] A moving seat 12 is connected to the top surface of the wing plate 4. A groove is formed on the surface of the moving seat 12 facing the base 1. An electromagnet 21 is fixedly embedded in the groove. The electromagnet 21 is powered by an external power supply. Concave receiving cavities 17 are formed on the outer walls of both sides of the base 1 in the width direction. A floating light plate 2 is snap-fitted in the receiving cavity 17. The floating light plate 2 can move freely or move up and down vertically in the receiving cavity 17 perpendicular to the thickness direction of the base 1. At least two connecting pins 20 are vertically and fixedly penetrated through the surface of the floating light plate 2. The connecting pins 20 vertically slide through the base 1. The ends of the two connecting pins 20 on the same floating light plate 2 passing through the base 1 are commonly sleeved with a magnetic conductive strip plate 3. And through holes for the free passage of the connecting pins 20 are formed on the surface of the magnetic conductive strip plate 3. A spring 19 is wound around the periphery of the connecting pin 20. The two ends of the elastic force direction of the spring 19 elastically abut against the magnetic conductive strip plate 3 and the surface of the base 1 respectively. In addition, a limit nut 16 is threadedly sleeved on the top end of the connecting pin 20. The limit nut 16 is threadedly screwed on the periphery of the connecting pin 20, so as to adjust the longitudinal distance between the magnetic conductive strip plate 3 and the top surface of the base 1. And the spring 19 maintains the elastic abutting force on the magnetic conductive strip plate 3, so that the position of the floating light plate 2 in the receiving cavity 17 is not likely to change;

[0049] The electromagnet 21 is located directly above the magnetic conduction strip 3, and there is a certain gap between the opposite surfaces of the electromagnet 21 and the magnetic conduction strip 3. This gap can be set to 2 - 5 mm, and there is no specific limit. However, it should be noted that the gap sizes between the electromagnet 21 and the magnetic conduction strip 3 on both sides need to be kept consistent. In addition, two magnetic shielding plates extending downward are fixedly connected to the surface of the moving seat 12 facing the base 1. The two magnetic shielding plates respectively correspond to both sides in the width direction of the magnetic conduction strip 3, so that the magnetic field of the electromagnet 21 is interfered by the magnetic shielding plates and will not affect the magnetic field between the armature 18 and the magnet 8. In addition, the moving seat 12 is connected to the middle position of the wing plate 4, so that when the electromagnets 21 on both sides are energized, the magnetic attraction force on the magnetic conduction strip 3 can act on the mover 11 evenly;

[0050] The top of the moving seat 12 is connected with a mounting seat 6. A mounting arm 5 is vertically penetrated through the surface of the mounting seat 6. One end of the mounting arm 5 away from the mounting seat 6 is rotatably connected with a roller 15. The roller 15 is in rolling contact with the surface of the floating optical plate 2. When the mover 11 moves linearly, the roller 15 rolls on the surface of the floating optical plate 2;

[0051] On both outer walls of the base 1 corresponding to the moving direction of the mover 11, a vertical plate 10 is respectively connected. A limit pin 9 is horizontally penetrated through the outer wall of the vertical plate 10. End caps 13 are respectively connected to both outer walls of the mover 11. The two end caps 13 are respectively used in cooperation with the limit pins 9 on the two vertical plates 10. After the mover 11 moves in place, the surface of the limit pin 9 contacts the surface of the end cap 13, thereby limiting the movement of the mover 11.

[0052] The working principle of the present invention:

[0053] When the two electromagnets 21 are energized, they generate magnetism and respectively generate equal magnetic attraction forces on the two magnetic conduction strips 3, so that the electromagnets 21 have a tendency to move in the direction of the magnetic conduction strip 3, and further the mover 11 also has a tendency to move in the direction of the base 1. Then, the mover 11 generates a force along the direction of the base 1 on the linear slider 7, so that the balls on the linear slider 7 are in relatively close contact with the surface of the guide rail 14. When the armature 18 is energized, it generates a magnetic field and cooperates with the magnet 8, and then can drive the mover 11 to move at a high speed, so that the mover 11 drives the linear slider 7 to slide on the guide rail 14. After sliding in place, the surface of the end cap 13 abuts against the end of the limit pin 9, thereby limiting the mover 11;

[0054] If the same wear amount occurs on the linear sliders 7 on the two guide rails 14, at this time, the mover 11 can move slightly in the direction perpendicular to the top surface of the base 1. Therefore, in this embodiment, under the action of the magnetic attraction force of the electromagnet 21 on the magnetic conduction strip 3, the linear slider 7 is kept in close contact with the guide rail 14. Therefore, the air gap between the armature 18 and the magnet 8 basically does not change and can be kept uniform everywhere;

[0055] If the wear amount of the linear slider 7 on one of the guide rails 14 is greater than that of the linear slider 7 on the other guide rail 14, refer to Figure 5 , for example, if the wear amount on the left side is greater than that on the right side, then the offset of the left side of the mover 11 relative to the base 1 (the offset in the direction perpendicular to the top surface of the base 1) is greater than that on the right side, and the mover 11 generates a small deflection with the right guide rail 14 as the rotation fulcrum. Since the distance between the electromagnet 21 and the mover 11 is smaller than the distance between the roller 15 and the mover 11, based on the lever principle, the swing amplitude of the roller 15 is slightly greater than that of the electromagnet 21, which further causes the roller 15 to move the floating light plate 2 downward. The movement of the floating light plate 2 will synchronously drive the magnetic conduction strip plate 3 to move. Therefore, the gap between the left magnetic conduction strip plate 3 and the left electromagnet 21 increases, resulting in a decrease in the magnetic attraction force of the left electromagnet 21 on the magnetic conduction strip plate 3. In this way, the magnetic attraction force of the right electromagnet 21 on the magnetic conduction strip plate 3 forces the mover 11 to deflect in the reverse direction, thereby maintaining a certain stable state and preventing the air gap change amount between the armature 18 and the magnet 8 from being too large, which affects the output of the linear motor.

[0056] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A linear motor, characterized in that: include: Base (1); A mover (11) is horizontally slidably connected to the surface of the base (1) by installing two guide rails (14) and a linear slider (7); An armature (18) is arranged on the outer wall of the mover (11) on the side facing the base (1), and a magnet (8) cooperating with the armature (18) is provided on the surface of the base (1); A moving seat (12) connected to the mover (11); Magnetic conductive strips (3) mounted on the surface of the base (1), the number of the magnetic conductive strips (3) being the same as the number of the guide rails (14); An electromagnet (21) embedded in the movable seat (12), the electromagnet (21) being arranged corresponding to the magnetic conductive strip plate (3); The top of the movable seat (12) is connected to a mounting seat (6), a mounting arm (5) is vertically penetrated through the surface of the mounting seat (6), and one end of the mounting arm (5) away from the mounting seat (6) is rotatably connected to a roller (15), and a accommodating cavity (17) is provided on the side wall of the base (1), a floating light plate (2) is clamped in the accommodating cavity (17), and the floating light plate (2) is freely movable up and down in the accommodating cavity (17), the roller (15) is in rolling contact with the surface of the floating light plate (2), and the floating light plate (2) is connected to the magnetic strip plate (3) through a buffer structure.

2. A linear motor according to claim 1, characterized in that: Two magnetic shielding plates are fixedly connected to a surface of the movable seat (12) facing the base (1), and the two magnetic shielding plates correspond to two sides of the magnetic conductive strip plate (3) in the width direction.

3. A linear motor according to claim 1, characterized in that: The outer walls of the base (1) on both sides corresponding to the movement direction of the mover (11) are respectively connected to vertical plates (10), and the outer walls of the vertical plates (10) are horizontally penetrated with limit pins (9). The outer walls of the mover (11) on both sides are respectively connected to end covers (13), and the two end covers (13) are used in conjunction with the limit pins (9) on the two vertical plates (10).

4. A linear motor according to claim 1, characterized in that: The outer walls of both sides of the mover (11) corresponding to the width direction of the guide rail (14) are integrally provided with wing plates (4), the linear slider (7) is connected to a side surface of the wing plate (4) facing the base (1), and the moving seat (12) is connected to the surface of the wing plate (4).

5. A linear motor according to claim 4, characterized in that: The electromagnet (21) is located directly above the magnetic conductive strip plate (3), and the movable seat (12) is connected to the middle position of the wing plate (4).

6. A linear motor according to claim 1, characterized in that: The buffer structure comprises a connecting pin (20) vertically and fixedly penetrated on the floating light plate (2), the connecting pin (20) is slidably penetrated on the base (1), and a through hole for the connecting pin (20) to freely pass through is opened on the surface of the magnetic strip (3), an elastic member is provided between the surface of the magnetic strip (3) and the base (1), the elastic member gives the magnetic strip (3) potential energy to move toward a side away from the base (1), and one end of the connecting pin (20) that penetrates the magnetic strip (3) is threadedly sleeved with a limiting nut (16).

7. A linear motor according to claim 6, characterized in that: The elastic member comprises a spring (19) which is sleeved around the periphery of the connecting pin (20), and two ends of the spring (19) in the elastic force direction elastically press against the magnetic conductive strip plate (3) and the surface of the base (1) respectively.

8. A linear motor according to any one of claims 5 to 7, characterized in that: The surfaces of the roller (15) and the floating light plate (2) are both chrome-plated.

9. A component transfer device, characterized in that: It comprises the linear motor as claimed in any one of claims 1 to 8.

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