Lifter

Abstract

According to the lifter, a positioning sleeve protrudes out of the end face of a main shaft, a magnet is fixedly arranged at the end of the positioning sleeve, a position sensor circuit board is installed on a groove of a positioning piece, and a position sensor is arranged at the position, corresponding to the magnet, of the position sensor circuit board. By means of the lifter, precise positioning of the motor can be achieved, and precise running and stopping of a machine are guaranteed.

Description

Technical Field

[0001] The invention relates to a lifter. Background Art

[0002] The present lifter (refer to the Chinese invention patent application, application number 201510092742.6) relates to a device that uses an electric winch to assist a person in climbing a vertical surface or descending.

[0003] This type of product basically uses a brushless motor as the power source. The brushless motor realizes power output through the motor drive circuit, and controls the electrical control circuit through the machine interface to realize the machine's ascent, descent, and lateral movement. The existing lifter will not be able to run and stop accurately during the ascent, descent, and lateral movement. The lifter will stop at the target position ahead of time or behind time, affecting the user experience. Summary of the invention

[0004] The lifter proposed by the present invention can realize the precise positioning of the motor and ensure the accurate operation and parking of the machine.

[0005] In order to achieve the above purpose, the lifter provided by the present invention includes a main shaft, a pulley, a motor and an electromagnetic brake installed at the end of the motor, the main shaft passes through the electromagnetic brake, and the end of the main shaft is provided with a magnet with radially distributed N poles and S poles; a position sensor circuit board is set at the end of the electromagnetic brake, and the electromagnetic brake is set between the position sensor circuit board and the motor, and a position sensor is provided at a position on the position sensor circuit board corresponding to the magnet.

[0006] According to one aspect of the present invention, a positioning sleeve is provided at the end of the main shaft corresponding to the electromagnetic brake, the positioning sleeve protrudes from the end face of the main shaft, and a magnet is fixed on the end; the positioning plate includes a groove, and a position sensor circuit board is installed in the groove; the positioning plate is installed on the electromagnetic brake.

[0007] According to one aspect of the present invention, the positioning piece is circular, and the positioning piece is coaxial with the electromagnetic brake and the main shaft.

[0008] According to one aspect of the present invention, the positioning piece has a convex portion protruding from an end surface of the positioning piece, the convex portion is located at the other end surface opposite to the groove, and the convex portion is inserted into the electromagnetic brake.

[0009] According to one aspect of the present invention, the positioning sleeve extends toward the magnet and passes through the positioning sheet, and the distance between the position sensor and the magnet is 0.5-2.5 mm.

[0010] According to one aspect of the present invention, the positioning plate is fixed to the electromagnetic brake by a first screw, and the position sensor circuit board is fixed to the positioning plate by a second screw.

[0011] According to one aspect of the present invention, the second screw holes are evenly distributed in the groove in a circumferential direction, and the first screw holes are evenly distributed on the outer surface of the positioning plate outside the groove.

[0012] According to an aspect of the present invention, the depth dimension of the groove is smaller than the thickness dimension of the position sensor circuit board.

[0013] According to an aspect of the present invention, the lifter includes an electrical control circuit board, and the electrical control circuit board is connected to the position sensor circuit board through a wire.

[0014] According to one aspect of the present invention, the positioning sleeve and the positioning sheet are made of non-magnetic soft material.

[0015] Compared with the prior art, the lifter provided by the present application has the following beneficial effects: 1. Through the setting of position sensor and magnet, the working status and position status of the motor can be effectively fed back, so that the motor control circuit can accurately control it; 2. The detection accuracy is ensured by the coaxial setting of the positioning piece, electromagnetic brake and main shaft; 3. The depth of the groove is smaller than the thickness of the position sensor circuit board, so that the second screw can press the sensor circuit board into the groove after being fixed and installed, and the position is firm and does not move; 4. The convex part on the positioning plate is inserted into the electromagnetic brake, so that the structure is easy to install and the coaxiality of the two can be ensured, thereby improving the accuracy.

[0016] The specific technical solutions and other beneficial effects of the present invention will be described in detail in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a partial internal structure diagram of a lifter provided by the present invention.

[0019] Figure 2 A partial exploded view of a circuit board of a lifter position sensor provided by the present invention.

[0020] Figure 3 A sectional view of the internal structure of a lifter provided by the present invention.

[0021] Figure 4 for Figure 3 A partial enlarged schematic diagram of .

[0022] In the figure: 1. pulley; 2. electrical control circuit board; 3. electromagnetic brake; 4. position sensor circuit board; 5. motor; 6. positioning sleeve; 7. magnet; 8. positioning plate; 81. groove; 82. convex part; 9. first screw; 10. second screw; 11. wire; 12. position sensor; 13. main shaft. Implementation

[0023] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0024] Those skilled in the art will appreciate that, in the absence of conflict, the features in the following embodiments and implementations may be combined with each other.

[0025] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the words "upper", "lower", "front", "back" and the like indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting / sleeving", "sleeve connection", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The present invention provides a lifter, such as Figure 1-4 As shown, as known from the public technology, the present invention provides a lifter that drives the gear box to rotate through the motor 5 and then drives the rope on the rope wheel 1 to move, thereby realizing vertical or horizontal movement. This field can also be called a single-soldier lift obstacle surmounting device, a portable power drive system.

[0028] The center hole of the electromagnetic brake 3 passes through the main shaft 13, is installed on the end cover of the motor 5, and is located on the other side of the motor away from the gear box and the rope wheel 1. The electromagnetic brake here is known to those skilled in the art. For example, the electromagnetic power-off brake uses a brake externally connected to a half-wave rectifier to rectify the single-phase AC into DC. After power is applied, the winding generates a magnetic field to suck the armature back, and the armature compresses the spring fixed in the iron core. When power is lost, the winding discharges, the spring ejects the armature, and the armature generates a braking torque on the friction disk to stop the motor.

[0029] The spindle 13 is hollow at the end near the electromagnetic brake 3, and a positioning sleeve 6 is fixed therein. The positioning sleeve 6 is a hollow cylindrical design, with a magnet 7 with radially distributed N poles and S poles embedded in the front end, and an interference fit into the spindle at the rear end. To ensure the stability of the magnet magnetic circuit, the magnet positioning sleeve uses a non-magnetic soft material, preferably aluminum or copper, and aluminum is used in this design. As those skilled in the art know, the end of the spindle can also be directly provided with a magnet with radially distributed N poles and S poles.

[0030] The positioning piece 8 is circular, with a groove 81 and a protrusion 82. To ensure the stability of the magnetic circuit, the positioning piece is made of non-magnetic soft material, preferably aluminum or copper, and aluminum is used in this design. The groove 81 is a circular groove concentric with the positioning piece 8. The surface of the groove 81 is evenly distributed with a number of second screw holes. The position sensor circuit board 4 is fixed on the surface of the groove 81 through the second screw 10 and the second screw hole. When it is installed in place, it can be foreseen that the second screw 10 protrudes from the installation surface of the groove 81. The present invention preferably sets the depth of the groove 81 to be less than the thickness of the sensor circuit board 4, and the sensor circuit board 4 is pressed and locked in the groove 81 by the second screw 10.

[0031] The convex portion 82 is annular and protrudes from the other end face opposite to the groove 81. When the positioning plate 8 is installed on the electromagnetic brake 3, the convex portion 82 is inserted into the electromagnetic brake and cooperates with the electromagnetic circumference to ensure coaxiality, that is, the positioning plate is coaxial with the electromagnetic brake and the main shaft. On the outer surface of the positioning plate 8, that is, the outermost edge area between the groove 81 and the positioning plate 8, a plurality of first screw holes are evenly distributed, and the positioning plate 8 is fixed to the outer end face of the electromagnetic brake 3 away from the motor 5 by the first screw 9.

[0032] A position sensor 12 is provided at the inner center of the position sensor circuit board 4 toward the motor direction. The positioning sleeve 6 extends toward the magnet 7 and passes through the positioning sheet toward the position sensor 12. Finally, the distance between the position sensor 12 and the magnet 7 is maintained at 0.5-2.5mm to ensure good signal control.

[0033] The outer circumference of the gearbox of the lifter disclosed in the present invention is provided with a heat dissipation bracket, and the adjacent surfaces of the heat dissipation bracket parallel to the axis of the reduction gearbox are respectively provided with an electrical control circuit board 2, a motor drive PCB board and a plurality of heat dissipation blocks. The size of the lifter volume is improved through a reasonable internal layout, so that the overall appearance of the machine is small and flexible. The electrical control circuit board 2 is connected to the position sensor circuit board through a wire. The position sensor detects the angle of the motor rotor by detecting the angle of the magnetic field. The angle change rate, that is, the angle change value per second, is fed back to the electrical control circuit board to determine whether the current motor reaches the set threshold. If the threshold is not reached, it is controlled to continue to accelerate. If the threshold is reached, it stops accelerating and maintains the current speed. Speed ​​control is performed through the precise positioning of the motor to ensure the precise operation of the machine.

[0034] The second embodiment of the present invention will not be repeated here, and the differences are explained as follows. If the rear end surface of the electromagnetic brake is flat, the position sensor circuit board positioning piece design in the first embodiment is cancelled, and the position sensor PCB is assembled on the rear end surface of the electromagnetic brake. The position sensor circuit board is fixed to the rear section of the electromagnetic brake with screws to ensure that the central circular hole of the electromagnetic brake is concentric with the motor output shaft. This solution can also achieve precise positioning of the motor to ensure accurate operation and parking of the machine.

[0035] The third embodiment of the present invention will not be repeated here, and the differences are explained as follows. The lifter provided in this embodiment includes a pad of the position sensor circuit board. In order to ensure the stability of the magnetic circuit of the magnet, the pad here is a non-magnetic material. The position sensor circuit board is assembled on the pad of the position sensor circuit board, and then the assembly is assembled into the groove of the positioning piece of the position sensor circuit board. During the assembly process, a clamping screw is used to press on the edge of the pad of the position sensor circuit board instead of directly pressing on the position sensor circuit board with the clamping screw, thereby reducing the deformation of the circuit board caused by press-fitting.

[0036] In summary, the lifter proposed in the present invention can achieve precise positioning of the motor and ensure accurate operation and parking of the machine.

[0037] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A lifter comprising a main shaft, a rope pulley, a motor and an electromagnetic brake mounted at the end of the motor, characterized in that: The main shaft passes through the electromagnetic brake, and a magnet with radially distributed N poles and S poles is provided at the end of the main shaft; a position sensor circuit board is set at the end of the electromagnetic brake, and the electromagnetic brake is set between the position sensor circuit board and the motor, and a position sensor is provided at a position on the position sensor circuit board corresponding to the magnet.

2. The lifter according to claim 1, characterized in that: The ends of the spindle corresponding to the electromagnetic brake are provided with positioning sleeves, the positioning sleeves protrude from the end face of the spindle, and a magnet is fixedly provided at the end; the positioning sheet includes a groove, and the position sensor circuit board is installed in the groove; the positioning sheet is installed on the electromagnetic brake.

3. The lifter according to claim 2, characterized in that: The positioning piece is circular and coaxial with the electromagnetic brake and the main shaft.

4. The lifter according to claim 3, characterized in that: The positioning piece has a convex portion protruding from an end surface of the positioning piece, the convex portion is located on the other end surface opposite to the groove, and the convex portion is inserted into the electromagnetic brake.

5. The lifter according to claim 4, characterized in that: The positioning sleeve extends toward the magnet and passes through the positioning sheet, and the distance between the position sensor and the magnet is 0.5-2.5 mm.

6. The lifter according to claim 2, characterized in that: The positioning plate is fixed to the electromagnetic brake by a first screw, and the position sensor circuit board is fixed to the positioning plate by a second screw.

7. The lifter according to claim 6, characterized in that: The second screw holes are evenly distributed in the groove in a circumferential direction, and the first screw holes are evenly distributed on the outer surface of the positioning plate outside the groove.

8. The lifter according to claim 6, characterized in that: The depth dimension of the groove is smaller than the thickness dimension of the position sensor circuit board.

9. The lifter according to claim 2, characterized in that: The lifter includes an electrical control circuit board, and the electrical control circuit board is connected to the position sensor circuit board through a wire.

10. The lifter according to claim 2, characterized in that: The positioning sleeve and the positioning sheet are made of non-magnetic soft materials.

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