Limiting device for screw rod of stepping motor

Abstract

The utility model discloses a stepping motor lead screw limiting device which comprises a shell, a rotor axially limited in the shell, a stator fixedly installed in the shell and arranged on the periphery of the rotor, a lead screw in threaded connection with the rotor, and a lead screw limiting mechanism. The limiting device is used for limiting the lead screw and the rotor relatively so that the lead screw and the rotor cannot rotate synchronously, and a limiting protrusion is arranged on the lead screw. The limiting channel is composed of the strip-shaped notches formed in the limiting rings, when the limiting device is used, the positions of the strip-shaped notches can be changed by rotating the angles of the limiting rings, and then the length of the limiting channel is changed, so that the moving distance of the lead screw is limited in an auxiliary mode, and the functions of the limiting device for the lead screw of the stepping motor are increased; and the actual use effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stepping motors, in particular to a stepping motor lead screw limiting device. Background Art

[0002] A stepper motor is an electric motor that converts electrical pulse signals into corresponding angular displacement or linear displacement. Each time a pulse signal is input, the rotor rotates an angle or moves forward one step. The angular displacement or linear displacement output is proportional to the number of input pulses, and the speed is proportional to the pulse frequency. Therefore, a stepper motor is also called a pulse motor.

[0003] A lead screw stepper motor, or linear stepper motor, is a motor that rotates by the interaction between a magnetic rotor core and a pulsed electromagnetic field generated by a stator. The lead screw stepper motor converts rotational motion into linear motion inside the motor. The lead screw limiter of the stepper motor is a structure used to limit the lead screw so that the lead screw and the rotor do not rotate synchronously. The existing lead screw limiter of the motor is externally arranged on the outside of the motor, and the overall structure is relatively large, which affects the installation and use of the stepper motor as a whole. In addition, it does have an automatic limit structure for the moving distance of the lead screw, so it cannot meet the needs of users. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects that the existing motor lead screw limit device in the prior art is externally arranged on the outside of the motor and has a relatively large overall structure, which affects the installation and use of the stepper motor as a whole, and it does have an automated limit structure for the moving distance of the lead screw, so it cannot meet the needs of users. A stepper motor lead screw limit device is provided, in which a lead screw limit mechanism is arranged at one end of the stator in the shell, that is, the lead screw limit mechanism is combined with the stepper motor in a design, and the overall structure is compact and small in size, so that in many application fields, the lead screw stepper motor can be directly used for precise linear motion without installing an external mechanical linkage device. Secondly, the limit channel is composed of a plurality of strip notches opened on the limit rings. When in use, by rotating the angle of the limit ring, the position of the strip notch can be changed, and then the length of the limit channel can be changed, so that the moving distance of the lead screw is auxiliary limited, the function of the stepper motor lead screw limit device is increased, and its actual use effect is improved.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model discloses a stepper motor lead screw limit device, comprising a housing, a rotor axially limited in the housing, a stator fixedly installed in the housing and arranged at the periphery of the rotor, and a lead screw threadedly connected to the rotor, wherein the circumferential rotation of the rotor can drive the axial displacement of the lead screw, and also comprises a lead screw limit mechanism, which is used to limit the lead screw and the rotor relative to each other so that they cannot rotate synchronously with the rotor, a limit protrusion is arranged on the lead screw, the lead screw limit mechanism comprises a limit block, the limit block fixes one end of the stator along the length direction, an annular protrusion is integrally formed at one end of the limit block away from the stator, a plurality of rotatable limit rings are arranged in the annular protrusion, a strip notch used in conjunction with the limit protrusion is opened on the inner wall of the limit ring, and a driving mechanism is also arranged on the annular protrusion, which is used to drive the plurality of limit rings to rotate, and is used to The positions of several strip notches on the limit rings are adjusted in sequence. The device is provided with a screw limit mechanism for auxiliary limiting the screw, so that the circumferential rotation of the rotor can drive the axial displacement of the screw, and the screw will not rotate synchronously with the rotor. The screw limit mechanism forms a limiting channel through the strip notches on the limit rings and cooperates with the limiting protrusions provided on the screw. The limiting protrusions are stuck in the limiting channel, so that the screw cannot rotate and can only move forward and backward in the horizontal direction. The limiting channel is composed of several strip notches on the limit rings. When in use, the position of the strip notch can be changed by rotating the angle of the limit ring, and then the length of the limiting channel can be changed, so that the moving distance of the screw is auxiliary limited, which increases the function of the stepping motor screw limit device and improves its actual use effect.

[0007] Preferably, several of the limiting rings are slidably connected to each other, an annular groove is provided on one side wall of the limiting ring, a slider is welded on the other side wall of the limiting ring, and two adjacent limiting rings are slidably connected to the groove via the slider.

[0008] Preferably, a gear ring is welded on the outer wall of the limiting ring.

[0009] Preferably, the driving mechanism includes a limit seat fixedly connected to the notch on one side of the annular protrusion, a driving plate that can move up and down is inserted in the limit seat, and a plurality of racks are arranged on a side wall of the driving plate close to the limit ring, the lateral positions and longitudinal heights of the plurality of racks are staggered with each other, and the plurality of racks correspond to the plurality of limit rings, so that the downward moving driving plate drives the plurality of limit rings to rotate in turn.

[0010] Preferably, an electric telescopic rod is installed at the protrusion of the outer wall of the limit seat, and the movable end of the electric telescopic rod is fixedly connected to the protrusion welded on the top of the outer wall of the driving plate. When in use, the electric telescopic rod is controlled to contract, and the driving plate is driven to move downward, so that the racks arranged on the several driving plates are in turn contacted with the gear rings arranged on the several limit rings from bottom to top, driving the limit ring to rotate, so that the strip notch opened on the limit ring overlaps with the limit protrusion arranged on the screw rod, and by controlling the downward movement height of the driving plate, the number of overlapping of the several strip notches and the limit protrusion can be adjusted, thereby realizing the automatic condition of the length of the limit channel and improving the quickness and convenience of its adjustment.

[0011] Preferably, a strip-shaped hole is provided on the outer wall of the annular protrusion at a position opposite to the driving mechanism.

[0012] Preferably, the positioning mechanism is an electric push rod, which is embedded and fixed in the limit block, and the movable end of the electric push rod is fixed with a limit strip, the top of the limit strip passes through the limit block and extends to the outside, and the limit ring is provided with a positioning groove used in conjunction with the limit strip. When several limit rings are driven to rotate in sequence by the driving mechanism, the strip-shaped notches provided on the several limit rings overlap with the limit protrusions, serving as a moving channel for the limit protrusions. At this time, the positioning groove provided on the limit ring rotates to a position relative to the limit strip, controlling the electric push rod to extend, driving the limit strip to be inserted into the positioning groove, thereby realizing the positioning of the limit ring and improving the stability of the limit ring.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] In the device, a screw limit mechanism is arranged at one end of the stator in the housing, that is, the screw limit mechanism is combined with the stepping motor, and the overall structure is compact and small in size, so that in many application fields, the screw stepping motor can be directly used to perform precise linear motion without installing an external mechanical linkage device;

[0015] Secondly, the limiting channel is composed of a plurality of strip-shaped notches opened on the limiting rings. When in use, by rotating the limiting ring angle, the position of the strip-shaped notch can be changed, thereby changing the length of the limiting channel, thereby auxiliary limiting the moving distance of the lead screw, increasing the function of the stepping motor lead screw limiting device and improving its actual use effect;

[0016] In addition, a driving mechanism is provided to automatically condition the angle of the limit ring. When in use, the electric telescopic rod is controlled to retract to drive the driving plate to move downward, so that the racks arranged on the several driving plates contact the gear rings arranged on the several limit rings in sequence from bottom to top, driving the limit ring to rotate, so that the strip notch on the limit ring overlaps with the limit protrusion arranged on the screw rod. By controlling the height of the downward movement of the driving plate, the number of overlapping of the several strip notches and the limit protrusion can be adjusted, thereby realizing automatic conditioning of the length of the limit channel and improving the quickness and convenience of its adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the screw rod limiting mechanism in the utility model;

[0020] Figure 4 It is a structural schematic diagram of the driving mechanism in the utility model;

[0021] Figure 5 It is a cross-sectional view of the limiting ring in the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the limiting ring in the utility model

[0023] Figure 7 for Figure 3 Magnified view of area A in .

[0024] 1. outer shell; 2. rotor; 3. stator; 4. screw; 41. limiting protrusion; 5. screw limiting mechanism; 51. limiting block; 52. annular protrusion; 53. limiting ring; 531. strip notch; 532. gear ring; 533. positioning groove; 534. slide groove; 535. slider; 54. driving mechanism; 541. limiting seat; 542. driving plate; 543. rack; 544. electric telescopic rod; 545. convex strip; 55. limiting strip; 56. strip hole. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 -Attached Figure 7, further illustrate the specific implementation of the utility model of a stepper motor lead screw limit device, overcome the existing motor lead screw limit device in the prior art is externally arranged on the outside of the motor, and the overall structure is large, affecting the installation and use of the stepper motor as a whole, and it does have an automatic limit structure for the moving distance of the lead screw, so it cannot meet the needs of users, and provide a stepper motor lead screw limit device, in which a lead screw limit mechanism is arranged at one end of the stator in the shell, that is, the lead screw limit mechanism is combined with the stepper motor, the overall structure is compact and the volume is small, so that in many application fields, the lead screw stepper motor can be directly used for precise linear motion without installing an external mechanical linkage device, and the limit channel is composed of a plurality of strip notches opened on the limit ring. When in use, by rotating the angle of the limit ring, the position of the strip notch can be changed, and then the length of the limit channel can be changed, so that the moving distance of the lead screw is auxiliary limited, the function of the stepper motor lead screw limit device is increased, and its actual use effect is improved. The utility model of a stepper motor lead screw limit device is not limited to the description of the following embodiments. Example

[0026] It includes a housing 1, a rotor 2 axially limited in the housing 1, a stator 3 fixedly installed in the housing 1 and arranged on the periphery of the rotor 2, and a screw connected with the rotor 2 by threading. The circumferential rotation of the rotor 2 can drive the axial displacement of the screw 4. It also includes a screw limiting mechanism 5 for limiting the screw 4 relative to the rotor 2 so that it cannot rotate synchronously with the rotor 2. A limiting protrusion 41 is provided on the screw 4.

[0027] The screw rod limiting mechanism 5 includes a limiting block 51, which fixes one end of the stator 3 along the length direction. The limiting block 51 is integrally formed with an annular protrusion 52 at the end away from the stator 3. A plurality of rotatable limiting rings 53 are arranged in the annular protrusion 52. A strip notch 531 for cooperating with the limiting protrusion 41 is provided on the inner wall of the limiting ring 53. A driving mechanism 54 is also provided on the annular protrusion 52, which is used to drive the plurality of limiting rings 53 to rotate and to adjust the positions of the strip notches 531 on the plurality of limiting rings 53 in sequence. The plurality of limiting rings 53 are slidably connected to each other. An annular groove 534 is provided on one side wall of the limiting ring 53. A slider 535 is welded on the other side wall of the limiting ring 53. Two adjacent limiting rings 53 are slidably connected to the groove 534 through the slider 535.

[0028] Specifically, a screw limit mechanism 5 is provided to assist in limiting the screw 4, so that the circumferential rotation of the rotor 2 can drive the axial displacement of the screw 4, and the screw 4 will not rotate synchronously with the rotor 2, and the screw limit mechanism 5 forms a limiting channel through the strip notches 531 opened on the limiting rings 53 to cooperate with the limiting protrusions 41 set on the screw 4, and the limiting protrusions 41 are stuck in the limiting channel, so that the screw 4 cannot rotate and can only move forward and backward in the horizontal direction, wherein the limiting channel is composed of the strip notches 531 opened on the limiting rings 53. When in use, by rotating the angle of the limiting ring 53, the position of the strip notch 531 can be changed, and then the length of the limiting channel can be changed, so that the moving distance of the screw 4 is assisted to be limited, thereby increasing the function of the screw limit device of the stepping motor and improving its actual use effect. Example

[0029] The present embodiment discloses a driving mechanism 54 based on the above embodiment, and the driving mechanism 54 is used to drive the plurality of limit rings 53 to rotate, so as to adjust the overlapping number of the strip notches 531 opened on the plurality of limit rings 53, that is, to realize the automatic adjustment of the length of the limit channel, and a gear ring 532 is welded on the outer wall of the limit ring 53, and the driving mechanism 54 includes a limit seat 541 fixedly connected to the notch on one side of the annular protrusion 52, and a driving mechanism 54 capable of moving up and down is inserted in the limit seat 541. The movable plate 542, a plurality of racks 543 are arranged on one side wall of the driving plate 542 close to the limiting ring 53, the lateral positions and longitudinal heights of the plurality of racks 543 are mutually offset, and the plurality of racks 543 correspond to the plurality of limiting rings 53, so that the downward moving driving plate 542 drives the plurality of limiting rings 53 to rotate in turn, and an electric telescopic rod 544 is installed at the protrusion of the outer wall of the limiting seat 541, and the movable end of the electric telescopic rod 544 is fixedly connected to the protrusion 545 welded on the top end of the outer wall of the driving plate 542.

[0030] Specifically, when in use, by controlling the electric telescopic rod 544 to retract, the driving plate 542 is driven to move downward, so that the racks 543 provided on the driving plates 542 are in contact with the gear rings 532 provided on the limiting rings 53 from bottom to top, driving the limiting rings 53 to rotate, so that the strip notches 531 provided on the limiting rings 53 overlap with the limiting protrusions 41 provided on the screw rod 4. By controlling the height of the downward movement of the driving plate 542, the number of overlapping strip notches 531 and the limiting protrusions 41 can be adjusted, thereby realizing the automatic adjustment of the length of the limiting channel and improving the convenience of its adjustment. Example

[0031] On the basis of the above-mentioned embodiments, this embodiment further adds a positioning mechanism, which is used to position a plurality of limit rings 53. A strip hole 56 is provided on the outer wall of the annular protrusion 52 at a position opposite to the driving mechanism 54. The embodiment also includes a positioning mechanism, which is an electric push rod (not shown in the figure), which is embedded and fixed in the limit block 51. The movable end of the electric push rod is fixed with a limit strip 55. The top end of the limit strip 55 passes through the limit block 51 and extends to the outside. The limit ring 53 is provided with a matching limit strip. 55 uses a positioning groove 533. Specifically, when the driving mechanism 54 drives several limit rings 53 to rotate in sequence, the strip-shaped notches 531 provided on the limit rings 53 overlap with the limit protrusions 41, serving as a moving channel for the limit protrusions 41. At this time, the positioning groove 533 provided on the limit ring 53 rotates to a position relative to the limit strip 55, controls the electric push rod to extend, and drives the limit strip 55 to be inserted into the positioning groove 533, thereby realizing the positioning of the limit ring 53 and improving the stability of the limit ring 53 when used.

[0032] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A stepper motor lead screw limiting device, comprising a housing (1), a rotor (2) axially limited in the housing (1), a stator (3) fixedly mounted in the housing (1) and disposed on the periphery of the rotor (2), and a lead screw (4) threadedly connected to the rotor (2), wherein the circumferential rotation of the rotor (2) can drive the lead screw (4) to axially move, and is characterized in that: It also includes a screw rod limiting mechanism (5) for limiting the relative position of the screw rod (4) and the rotor (2) so that the screw rod (4) and the rotor (2) cannot rotate synchronously with each other, and a limiting protrusion (41) is provided on the screw rod (4); The screw rod limiting mechanism (5) comprises a limiting block (51), wherein the limiting block (51) fixes one end of the stator (3) along the length direction, and an annular protrusion (52) is integrally formed at one end of the limiting block (51) away from the stator (3), wherein a plurality of rotatable limiting rings (53) are arranged inside the annular protrusion (52), and a strip-shaped notch (531) used in conjunction with the limiting protrusion (41) is provided on the inner wall of the limiting ring (53), and a driving mechanism (54) is also arranged on the annular protrusion (52), which is used to drive the plurality of limiting rings (53) to rotate, and is used to sequentially adjust the positions of the strip-shaped notches (531) on the plurality of limiting rings (53).

2. A stepper motor lead screw limiting device according to claim 1, characterized in that: A plurality of the limiting rings (53) are slidably connected to each other, an annular sliding groove (534) is provided on one side wall of the limiting ring (53), a sliding block (535) is welded on the other side wall of the limiting ring (53), and two adjacent limiting rings (53) are slidably connected to the sliding groove (534) via the sliding block (535).

3. A stepping motor lead screw limiting device according to claim 2, characterized in that: A gear ring (532) is welded on the outer wall of the limiting ring (53).

4. A stepping motor lead screw limiting device according to claim 3, characterized in that: The driving mechanism (54) comprises a limiting seat (541) fixedly connected to a notch on one side of the annular protrusion (52); a driving plate (542) capable of moving up and down is inserted into the limiting seat (541); a plurality of racks (543) are arranged on a side wall of the driving plate (542) close to the limiting ring (53); the lateral positions and longitudinal heights of the plurality of racks (543) are mutually offset, and the plurality of racks (543) correspond to the plurality of limiting rings (53), so that the downward moving driving plate (542) drives the plurality of limiting rings (53) to rotate in sequence.

5. A stepping motor lead screw limiting device according to claim 4, characterized in that: An electric telescopic rod (544) is installed at the protrusion of the outer wall of the limiting seat (541), and the movable end of the electric telescopic rod (544) is fixedly connected to a protruding strip (545) welded at the top end of the outer wall of the driving plate (542).

6. A stepping motor lead screw limiting device according to claim 5, characterized in that: A strip-shaped hole (56) is provided on the outer wall of the annular protrusion (52) at a position opposite to the driving mechanism (54).

7. A stepping motor lead screw limiting device according to claim 6, characterized in that: The device also includes a positioning mechanism, which is an electric push rod, which is embedded and fixed in a limit block (51), a limit strip (55) is fixed to the movable end of the electric push rod, the top end of the limit strip (55) passes through the limit block (51) and extends to the outside, and a positioning groove (533) used in conjunction with the limit strip (55) is provided on the limit ring (53).

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