Linear motor and element transferring equipment

Abstract

The invention discloses a linear motor and element transferring equipment, and relates to the technical field of linear motors. A guide rail; a linear slider; a mover; an armature; a magnet; a moving seat; the number of the magnetic conductive strip plates is consistent with that of the guide rails; and the electromagnet is embedded on the movable seat and is arranged corresponding to the magnetic conductive strip plate. According to the invention, the electromagnet is electrified to generate magnetism so as to generate magnetic attraction force to the magnetic strip plate, and under the action of the magnetic attraction force, the mover can be subjected to acting force towards the direction of the base, so that the linear sliding block is kept in contact with the surface of the guide rail, and when the guide rail or a ball on the linear sliding block is abraded, the linear sliding block is prevented from being abraded. According to the linear motor, an air gap between the armature and the magnet does not become larger and tends to be uniform, the output precision of the linear motor is improved, in addition, the electromagnet does not make contact with the surface of the magnetic strip plate, generated abrasion is small, and resistance cannot be generated in the moving direction of the rotor.

Description

Technical Field

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

[0002] Linear motors (or linear motors) can directly convert electrical energy into linear motion without the need for any intermediate conversion mechanism transmission device. Linear motors are generally composed of a base, armature, magnet, guide rail, and mover.

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

[0004] However, the linear slider and guide rail will inevitably wear out during long-term use. For example, when the steel ball in the linear slider is worn, the connection between the steel ball and the guide rail is not tight, which may cause the linear slider and the guide rail to loosen. When the looseness is large, the mover may be displaced relative to the base, which will cause the air gap between the armature and the magnet to become larger or smaller (if the mover is connected to the external transfer device facing downward, the air gap will become larger, otherwise the air gap will become smaller), making the air gap uneven, thereby affecting the output of the linear motor. Summary of the invention

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

[0006] To achieve the above object, the present invention provides the following technical solutions: A linear motor comprising: Base; A mover connected to the surface of the base by installing two guide rails and a linear slider for horizontal sliding connection; An armature is arranged on the outer wall of the mover facing the base, and a magnet matching with the armature is arranged on the surface of the base; A moving seat connected to the mover; Magnetic conductive strips installed on the surface of the base, the number of the magnetic conductive strips being consistent with the number of the guide rails; The electromagnet is embedded in the movable seat, and the electromagnet is arranged corresponding to the magnetic conductive strip plate.

[0007] Through the above technical solution, magnetism is generated by energizing the electromagnet, thereby generating a magnetic attraction force on the magnetic conductive strip. Under the action of the magnetic attraction force, the mover can be subjected to a force in the direction of the base, so that the linear slider maintains contact with the surface of the guide rail. When the ball bearings on the guide rail or the linear slider are worn, the air gap between the armature and the magnet will not become larger, and the air gap will tend to be uniform, thereby improving the output accuracy of the linear motor. In addition, the electromagnet and the surface of the magnetic conductive strip are not in contact, so the wear generated is small, and no resistance is generated in the moving direction of the mover.

[0008] Furthermore, two magnetic shielding plates are fixedly connected to a surface of the movable seat facing the base, and the two magnetic shielding plates correspond to two sides of the magnetic conductive strip plate in the width direction respectively.

[0009] Through the above technical solution, the magnetic shielding plate can prevent the magnetic field of the electromagnet from affecting the magnetic field between the armature and the magnet.

[0010] Furthermore, the outer walls on both sides of the base corresponding to the movement direction of the mover are respectively connected with vertical plates, and limit pins are horizontally penetrated through the outer walls of the vertical plates. The outer walls on both sides of the mover are respectively connected with end covers, and the two end covers are respectively used in conjunction with the limit pins on the two vertical plates.

[0011] Through the above technical solution, after the mover moves to the right position, the limit pin contacts the surface of the end cover, thereby limiting the movement of the mover.

[0012] Furthermore, the outer walls of both sides of the mover corresponding to the width direction of the guide rail are integrally provided with wing plates, the linear slider is connected to a side surface of the wing plate facing the base, and the moving seat is connected to the surface of the wing plate.

[0013] Through the above technical solution, the wing plate is provided so that the thickness of the mover can be reduced as much as possible during design, thereby reducing the mass of the mover and thus reducing the inertia during movement.

[0014] Furthermore, the electromagnet is located directly above the magnetic conductive strip plate, and the movable seat is connected to the middle position of the wing plate.

[0015] Through the above technical solution, the magnetic attraction force of the two electromagnets on the magnetic conductive strips can act symmetrically on the mover, thereby making the contact between the linear sliders on the two guide rails and the guide rails uniform.

[0016] Furthermore, a mounting seat is connected to the top of the movable seat, a mounting arm is vertically penetrated through the surface of the mounting seat, an end of the mounting arm away from the mounting seat is rotatably connected to a roller, a accommodating cavity is opened on the side wall of the base, a floating light plate is engaged in the accommodating cavity, the floating light plate can move freely up and down in the accommodating cavity, the roller is in rolling contact with the surface of the floating light plate, and the floating light plate is connected to the magnetic strip plate through a buffer structure.

[0017] Through the above technical scheme, the roller rolls on the surface of the floating light plate. When the linear slider on one side is more worn than the linear slider on the other side, the mover is offset, thereby increasing the squeezing force of one roller on the corresponding floating light plate surface, so that the roller squeezes the floating light plate, and the floating light plate will drive the magnetic strip plate to move toward the inner side of the base. Since the lateral spacing between the floating light plate and the guide rail is larger than the lateral spacing between the electromagnet and the guide rail, the floating light plate moves downward at a larger amplitude, thereby increasing the spacing between the magnetic strip plate and the electromagnet. After the spacing increases, the magnetic attraction of the electromagnet on this side to the magnetic strip plate will decrease, so that the magnetic attraction of the electromagnet on the other side to the magnetic strip plate will increase, thereby forcing the mover to deflect in the opposite direction. In this way, the self-balancing of the mover can be achieved to minimize the change in the air gap between the armature and the magnet.

[0018] Furthermore, the buffer structure includes a connecting pin vertically and fixedly inserted into the floating light plate, the connecting pin is slidably inserted into the base, and a through hole is opened on the surface of the magnetic strip for the connecting pin to pass freely, an elastic member is provided between the magnetic strip and the surface of the base, and the elastic member gives the magnetic strip potential energy to move toward the side away from the base, and one end of the connecting pin passing through the magnetic strip is threadedly sleeved with a limiting nut.

[0019] Through the above technical solution, the limiting nut and the elastic member are provided, so that the gap between the electromagnet and the magnetic conductive strip can be adjusted during assembly to ensure that the gap between the electromagnet and the magnetic conductive strip on both sides is consistent.

[0020] Furthermore, the elastic member includes a spring wrapped around the periphery of the connecting pin, and two ends of the spring in the elastic force direction elastically press against the magnetic conductive strip plate and the base surface respectively.

[0021] Through the above technical solution, the spring maintains the pre-pressure on the magnetic conductive strip plate, so that the floating light plate can maintain a stable position after moving up and down in the accommodating cavity.

[0022] Furthermore, the surfaces of the roller and the floating light plate are both chrome-plated.

[0023] By means of the above technical solution, the friction and wear on the surface of the roller and the floating light plate can be reduced.

[0024] A component transfer device comprises the linear motor as described above.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, magnetism is generated by electrifying the electromagnet, thereby generating a magnetic attraction force on the magnetic conductive strip. Under the action of the magnetic attraction force, the mover can be subjected to a force in the direction of the base, so that the linear slider maintains contact with the surface of the guide rail, and when the ball on the guide rail or the linear slider is worn, the air gap between the armature and the magnet does not change too much, and the air gap tends to be uniform, thereby improving the output accuracy of the linear motor; 2. In the present invention, the roller rolls on the surface of the floating light plate. When the linear slider on one side is more worn than the linear slider on the other side, the mover is offset, thereby increasing the squeezing force of one roller on the corresponding floating light plate surface, so that the roller squeezes the floating light plate, and the floating light plate drives the magnetic strip plate to move toward the inner side of the base. Since the lateral spacing between the floating light plate and the guide rail is larger than the lateral spacing between the electromagnet and the guide rail, the floating light plate moves downward by a larger amplitude, thereby increasing the spacing between the magnetic strip plate and the electromagnet. After the spacing increases, the magnetic attraction of the electromagnet on this side to the magnetic strip plate will decrease, so that the magnetic attraction of the electromagnet on the other side to the magnetic strip plate will increase, thereby forcing the mover to deflect in the opposite direction, thereby achieving self-balancing of the mover to minimize the change in the air gap between the armature and the magnet; 3. In the present invention, a limit nut and an elastic member are provided to adjust the gap between the electromagnet and the magnetic conductive strip during assembly to ensure that the gaps between the electromagnet and the magnetic conductive strip on both sides are consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a linear motor in the present invention; Figure 2 for Figure 1 Schematic diagram of the positional relationship of the first perspective; Figure 3 for Figure 1 Schematic diagram of the positional relationship of the second perspective; Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point A; Figure 5 It is a schematic diagram of the positional relationship of the mover, the guide rail and the floating light plate after being assembled in the present invention; Figure 6 for Figure 5 A schematic diagram of the positional relationship from another perspective; Figure 7 It is a schematic diagram of the positional relationship of the floating light plate, the magnetic strip plate and the movable seat after being assembled in the present invention; Figure 8 for Figure 7 A schematic diagram of the positional relationship from another perspective; Fig. 9 for Figure 7 Schematic diagram of the exploded decomposition of the structure.

[0027] In the figure, the description of each figure mark is as follows: 1. base; 2. floating light plate; 3. magnetic 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 chamber; 18. armature; 19. spring; 20. connecting pin; 21. electromagnet. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 - Fig. 9 The present invention provides a technical solution: a component transfer device, including a linear motor, the linear motor including a base 1 installed on the external component transfer device, the base 1 is horizontally connected to a guide rail 14 on both sides of the width direction, the length direction of the guide rail 14 is consistent with the length direction of the base 1, and each guide rail 14 is equipped with two linear sliders 7, the 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 fixed with a U-shaped mover 11, and the top of the mover 11 is provided with a plurality of screw holes, which are used to connect with the external transfer device (such as a suction nozzle). , suction cup, etc.), an armature 18 is installed on the outer wall of one side of the mover 11 facing the base 1, and a plurality of magnets 8 of an even number are provided on the top of the base 1, and these magnets 8 are arranged at equal intervals along the length direction of the base 1, and are alternately arranged as N poles and S poles on the side facing the mover 11, the magnets 8 are used in conjunction with the armature 18, and the longitudinal gap between the opposite surfaces of the two 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, and such a setting can reduce the mass of the mover 11 as much as possible, thereby reducing the inertia of the mover 11 when it moves; The top surface of the wing plate 4 is connected to a moving seat 12, and a groove is provided on the side of the moving seat 12 facing the base 1, and an electromagnet 21 is fixedly embedded in the groove, and the electromagnet 21 is powered by an external power supply. The outer walls on both sides of the width direction of the base 1 are provided with a recessed accommodating cavity 17, and a floating light plate 2 is installed in the accommodating cavity 17 in a snap-fitting manner. The floating light plate 2 can move freely in the accommodating cavity 17 along a direction perpendicular to the thickness of the base 1, or move freely up and down. At least two connecting pins 20 are vertically fixedly penetrated on the surface of the floating light plate 2, and the connecting pins 20 are vertically slidably penetrated on the base 1, and two connecting pins on the same floating light plate 2 One end of the pin 20 passing through the base 1 is sleeved with the magnetic strip 3, and a through hole is provided on the surface of the magnetic strip 3 for the connecting pin 20 to pass freely. A spring 19 is sleeved around the periphery of the connecting pin 20, and the two ends of the spring 19 elastically press against the magnetic strip 3 and the surface of the base 1 respectively. In addition, the top end of the connecting pin 20 is threadedly sleeved with a limiting nut 16, and the limiting nut 16 is threadedly screwed on the periphery of the connecting pin 20, so that the longitudinal distance between the magnetic strip 3 and the top surface of the base 1 can be adjusted, and the spring 19 maintains an elastic pressing force on the magnetic strip 3, so that the position of the floating light plate 2 in the accommodating cavity 17 is not easy to change; The electromagnet 21 is located directly above the magnetic conductive strip 3, and has a certain gap with the opposite surface of the magnetic conductive strip 3. The gap can be set to 2-5 mm, and there is no specific restriction. However, it should be noted that the gap size between the electromagnets 21 and the magnetic conductive strip 3 on both sides needs to be consistent. In addition, the movable seat 12 is fixedly connected to one side facing the base 1 with two magnetic shielding plates extending downward, and the two magnetic shielding plates correspond to the two sides of the width direction of the magnetic conductive strip 3 respectively, 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 movable 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 conductive strip 3 can act evenly on the mover 11; The top of the moving seat 12 is connected to a mounting seat 6, and a mounting arm 5 is vertically penetrated on the surface of the mounting seat 6. The end of the mounting arm 5 away from the mounting seat 6 is rotatably connected to a roller 15, and the roller 15 is in rolling contact with the surface of the floating light plate 2. When the mover 11 moves in a straight line, the roller 15 rolls on the surface of the floating light plate 2; The outer walls on both sides of the base 1 corresponding to the movement direction of the mover 11 are respectively connected to vertical plates 10, and limit pins 9 are horizontally penetrated through the outer walls of the vertical plates 10. The outer walls on both sides of the mover 11 are respectively connected to end covers 13. The two end covers 13 are respectively used in conjunction with the limit pins 9 on the two vertical plates 10. After the mover 11 moves into place, the limit pins 9 contact the surfaces of the end covers 13, thereby limiting the movement of the mover 11.

[0030] Working principle of the present invention: When the two electromagnets 21 are energized, magnetism is generated, and equal magnetic attraction forces are generated on the two magnetic strips 3 respectively, so that the electromagnets 21 have a tendency to move in the direction of the magnetic strips 3, and then the mover 11 also has a tendency to move in the direction of the base 1, and then the mover 11 generates a force on the linear slider 7 along the direction of the base 1, so that the ball on the linear slider 7 is in close contact with the surface of the guide rail 14. When the armature 18 is energized, a magnetic field is generated, and it cooperates with the magnet 8, and then it 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 into place, the surface of the end cover 13 abuts against the end of the limit pin 9, thereby limiting the mover 11. If the linear sliders 7 on the two guide rails 14 have the same amount of wear, the mover 11 can move slightly in a direction perpendicular to the top surface of the base 1. Therefore, in this embodiment, the linear slider 7 maintains close contact with the guide rail 14 under the magnetic attraction of the electromagnet 21 on the magnetic strip 3, so the air gap between the armature 18 and the magnet 8 will not change and can be kept uniform everywhere. If the wear amount of the linear slider 7 on one guide rail 14 is greater than the wear amount 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 perpendicular to the top surface of the base 1) is greater than that on the right side, and the mover 11 produces a small deflection with the right guide rail 14 as the rotation fulcrum. Since the spacing between the electromagnet 21 and the mover 11 is smaller than the spacing between the roller 15 and the mover 11, based on the lever principle, the swing amplitude of the roller 15 is slightly larger than the swing amplitude of the electromagnet 21, so that the roller 15 moves the floating light plate 2 downward. The movement of the floating light plate 2 will synchronously drive the magnetic strip 3 to move. Therefore, the gap between the left magnetic strip 3 and the left electromagnet 21 increases, so that the magnetic attraction of the left electromagnet 21 on the magnetic strip 3 is reduced. In this way, the magnetic attraction of the right electromagnet 21 on the magnetic strip 3 forces the mover 11 to deflect in the opposite direction, thereby maintaining a certain stable state, so that the change in the air gap between the armature 18 and the magnet 8 is not too large, thereby affecting the output of the linear motor.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and 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) connected to the surface of the base (1) by installing two guide rails (14) and a linear slider (7) for horizontal sliding connection; 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 arranged 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) is embedded in the movable seat (12), and the electromagnet (21) is arranged corresponding to the magnetic conductive strip plate (3).

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 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.

7. A linear motor according to claim 6, 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).

8. A linear motor according to claim 7, 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.

9. A linear motor according to any one of claims 6 to 8, characterized in that: The surfaces of the roller (15) and the floating light plate (2) are both chrome-plated.

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

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