A linear stepper motor

Abstract

The application discloses a linear stepping motor, which comprises a servo motor, a cylinder, a rotating part, a support, a screw rod and a guide assembly. The output shaft of the servo motor is fixedly connected with the rotating part, and the end, away from the servo motor, of the rotating part is fixedly connected with the support. One end of the screw rod penetrates through the support, and the screw rod is in threaded cooperation with the support. The cylinder is fixed on the servo motor, and the rotating part and the support are both located in the cylinder. The end of the cylinder is provided with a through hole, and the end, away from the servo motor, of the screw rod penetrates through the through hole. The guide assembly comprises a guide part and a plurality of limiting screws. The guide part is fixed on the end of the screw rod penetrating through the through hole. The plurality of limiting screws are all fixed on the cylinder, the guide part penetrates through the plurality of limiting screws, and the screw rods of the plurality of limiting screws abut against the two side walls of the guide part respectively. The side wall of the guide part abuts against the outer side wall of the cylinder, and the nuts of the plurality of limiting screws all abut against the side wall of the guide part, away from the cylinder. The application increases the stability of the screw rod extension and retraction.

Description

TECHNICAL FIELD

[0001] The application relates to a step servo motor, in particular to a linear step motor. BACKGROUND

[0002] The linear step motor is also called a servo motor cylinder, is a modular product integrating a servo motor and a screw rod, converts the rotary motion of the servo motor into linear motion, and is a new product realizing high-precision linear motion.

[0003] A linear step motor is disclosed in the prior art, comprising a servo motor, a cylinder, a screw rod pair and a push rod; the cylinder is composed of a front end plate, a rear end plate and an aluminum alloy cylinder body connected between the front end plate and the rear end plate; the screw rod pair is arranged in the cylinder, a screw rod in the screw rod pair is arranged along a central axis of the cylinder, and a rear end of the screw rod is rotatably supported on the rear end plate; a nut in the screw rod pair is fixedly arranged on a nut seat, and a guide structure along the central axis direction is arranged between the nut seat and an inner wall of the aluminum alloy cylinder body; the push rod is in a sleeve structure, the push rod is sleeved on the screw rod in the screw rod pair from front to back with an open rear end, and the push rod is fixedly connected to the nut seat; a guide through hole is arranged on the front end plate corresponding to a front end of the push rod, and the front end of the push rod extends from the guide through hole; the servo motor is in transmission connection with the rear end of the screw rod in the screw rod pair, drives the push rod to extend through the screw rod pair, and a pressure sensor is arranged between the rear end of the push rod and the nut seat; a magnetic element is arranged on the rear end of the push rod or the nut seat, and a magnetic switch for sensing the magnetic element is correspondingly arranged on the outside of the aluminum alloy cylinder body, thereby forming a limit switch structure. In the working process of the linear step motor, the screw rod pair is driven to rotate by the servo motor, the screw rod pair is threadedly connected with the push rod, thereby driving the screw rod to extend and retract; the guide through hole has a guiding effect on the push rod, thereby increasing the stability of the push rod in extension and retraction.

[0004] The workers found the following defects in the long-term working process: in the related art, the push rod is guided through the guide through hole, and when the push rod is in long-term extension and retraction, relative friction occurs between the extension rod and the inner side wall of the guide through hole, thereby causing wear of the inner side wall of the guide through hole, and thus reducing the stability of the push rod in extension and retraction. Content of the utility model

[0005] In order to increase the stability of the screw rod in extension and retraction, the application provides a linear step motor.

[0006] The linear step motor provided by the application adopts the following technical scheme:

[0007] The linear stepping motor comprises a servo motor, a cylinder, a rotating piece, a support, a screw rod and a guiding assembly; the output shaft of the servo motor is fixedly connected with the rotating piece, and the end of the rotating piece away from the servo motor is fixedly connected with the support; one end of the screw rod penetrates through the support, and the screw rod is threadedly matched with the support; the cylinder is fixed on the servo motor, and the rotating piece and the support are located in the cylinder; the end of the cylinder is provided with a through hole, and the end of the screw rod away from the servo motor penetrates through the through hole.

[0008] The guiding assembly comprises a guiding piece and a plurality of limiting screws; the guiding piece is fixed on the end of the screw rod penetrating through the through hole; the plurality of limiting screws are fixed on the cylinder, and the guiding piece penetrates through the plurality of limiting screws; the screw rods of the plurality of limiting screws abut against the two side walls of the guiding piece respectively; the side wall of the guiding piece abuts against the outer side wall of the cylinder, and the screw nuts of the plurality of limiting screws abut against the side wall of the guiding piece away from the cylinder.

[0009] By adopting the above technical scheme, the output shaft of the servo motor is driven to rotate, the output shaft drives the support to rotate, the support is threadedly matched with the screw rod, and the screw rod is driven to stretch and retract; in the process of stretching and retracting, the plurality of limiting screws have a guiding effect on the guiding piece, so that the guiding piece stably slides along the length direction of the cylinder; the guiding piece drives the screw rod to stably stretch and retract along the length direction of the cylinder, and can also limit the rotation of the screw rod, thereby increasing the stability of the stretching and retraction of the screw rod.

[0010] Optionally, the rotating piece comprises a rotating rod and a rotating column; one end of the rotating rod is fixedly connected with the output shaft of the servo motor, and the other end of the rotating rod is fixedly connected with the rotating column; a guiding hole is formed in the rotating rod, and an installation hole is formed in the rotating column, and the installation hole is in communication with the guiding hole; one end of the screw rod penetrating through the support is located in the guiding hole, the screw rod is gap matched with the guiding hole, the support is insertedly matched with the installation hole, and the support is fixedly connected with the rotating column.

[0011] By adopting the above technical scheme, the installation hole has a positioning effect on the support, thereby increasing the convenience of fixing the support on the rotating column for the worker; meanwhile, since the guiding hole is in communication with the installation hole, one end of the screw rod is located in the guiding hole, the screw rod is gap matched with the guiding hole, the guiding hole has a guiding effect on the screw rod, and the stability of the sliding of the screw rod along the length direction of the cylinder is increased.

[0012] Optionally, the outer side wall of the rotating column is threadedly matched with a sleeve, a connecting block is fixedly arranged on the support, the side wall of the connecting block abuts against the side wall of the sleeve, a plurality of bolts are arranged on the connecting block, and the plurality of bolts are threadedly matched with the sleeve.

[0013] Through the above technical scheme, the sleeve is threadedly connected with the outer sidewall of the rotating column, thereby increasing the convenience of the staff in installing and dismounting the sleeve; meanwhile, the connecting block is fixed on the sleeve by the bolt, thereby fixing the support on the rotating column, increasing the convenience of the staff in installing and dismounting the support, and the connecting block has a limiting effect on the sleeve, thereby increasing the firmness of the sleeve fixed on the rotating column.

[0014] Optionally, the inner sidewall of the cylinder is provided with an annular groove, the annular groove is provided with a bearing, the rotating column passes through the bearing, and the rotating column is fixedly connected with the inner sidewall of the bearing.

[0015] Through the above technical scheme, the annular groove has a positioning effect on the bearing, thereby increasing the convenience of the staff in installing the bearing in the cylinder; meanwhile, the bearing increases the stability of the rotating column in rotation.

[0016] Optionally, the outer sidewall of the rotating column is fixedly provided with an abutting portion, the abutting portion abuts against one sidewall of the bearing, and the groove bottom of the annular groove abuts against another sidewall of the bearing.

[0017] Through the above technical scheme, the abutting portion and the groove bottom of the annular groove have a positioning effect on the bearing, thereby increasing the stability of the bearing in rotation in the cylinder.

[0018] Optionally, the annular groove is provided with a clamping column, and the sidewall of the clamping column abuts against the sidewall of the bearing away from the groove bottom of the annular groove.

[0019] Through the above technical scheme, the clamping column and the groove bottom of the mounting groove have a positioning effect on the bearing, thereby further increasing the stability of the bearing in rotation.

[0020] Optionally, the end of the lead screw is fixedly provided with a plug rod, the guide piece is provided with a plug hole, the plug rod passes through the plug hole, and the plug rod is fixedly connected with the guide piece.

[0021] Through the above technical scheme, the plug hole in the guide piece has a positioning effect on the plug rod on the lead screw, thereby increasing the convenience of the staff in installing the guide piece on the lead screw.

[0022] Optionally, the plug rod is provided with a positioning ring, the end of the lead screw abuts against one sidewall of the positioning ring, and the guide piece abuts against another sidewall of the positioning ring.

[0023] Through the above technical scheme, the positioning ring increases the contact area between the end of the lead screw and the guide piece, thereby increasing the firmness of the guide piece fixed on the lead screw.

[0024] Optionally, the plug rod is fixedly provided with a clamping column, and the clamping column abuts against the sidewall of the guide piece away from the positioning ring.

[0025] By adopting the above technical solution, the clamping column and positioning ring have a clamping effect on the guide, which increases the firmness of the clamping component fixed on the lead screw.

[0026] Optionally, a bolt is provided on the clamping post, and the bolt is threaded into the insertion rod.

[0027] By adopting the above technical solution, the bolts fix the clamping column to the insertion rod, thereby fixing the clamping component to the insertion rod, which increases the convenience for workers to install and disassemble the clamping component.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] The output shaft is driven to rotate by a servo motor, which in turn drives the support to rotate. The support is threaded with the lead screw, thereby causing the lead screw to extend and retract. During the extension and retraction of the lead screw, multiple limit screws guide the guide component, allowing the guide component to slide stably along the length of the cylinder. The guide component drives the lead screw to extend and retract stably along the length of the cylinder, while also limiting the rotation of the lead screw, thus increasing the stability of the lead screw's extension and retraction.

[0030] The mounting hole positions the support, increasing the convenience for workers to fix the support to the rotating column; at the same time, since the guide hole 311 is connected to the mounting hole, one end of the lead screw is located in the guide hole 311, and the lead screw and the guide hole 311 are in clearance fit. The guide hole 311 guides the lead screw, increasing the stability of the lead screw sliding along the length of the cylinder.

[0031] The sleeve is threaded to the outer wall of the rotating column, which increases the convenience of the operator in installing and disassembling the sleeve. At the same time, the connecting block is fixed to the sleeve by bolts, thereby fixing the support to the rotating column, which increases the convenience of the operator in installing and disassembling the support. Meanwhile, the connecting block has a limiting effect on the sleeve, which increases the firmness of the sleeve fixed to the rotating column. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the linear stepper motor in the embodiments of this application.

[0033] Figure 2 yes Figure 1 Half-sectional view of a linear stepper motor.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Servo motor; 11. Output shaft; 2. Cylinder; 21. Through hole; 22. Annular groove; 3. Rotating component; 31. Rotating rod; 311. Guide hole; 32. Rotating column; 33. Mounting hole; 34. Abutment part; 4. Support; 41. Connecting block; 5. Lead screw; 51. Insert rod; 6. Guide assembly; 61. Guide component; 611. Guide block; 612. Fixing block; 613. Insertion hole; 62. Limit screw; 7. Sleeve; 8. Positioning ring; 9. Clamping ring; 10. Bearing; 12. Clamping column. Detailed Implementation

[0036] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0037] A linear stepper motor, reference Figure 1 and Figure 2 The linear stepper motor includes a servo motor 1, a cylinder 2, a rotating component 3, a support 4, a lead screw 5, and a guide assembly 6.

[0038] Reference Figure 2 The cylinder 2 is fixed to one end of the servo motor 1, and the end of the cylinder 2 away from the servo motor 1 is closed. The rotating component 3 and the support 4 are both located inside the cylinder 2. The rotating component 3 includes a rotating rod 31 and a rotating column 32. One end of the rotating rod 31 is integrally formed with the output shaft 11 of the servo motor 1, and the other end of the rotating rod 31 is integrally formed with the rotating column 32. A guide hole 311 is provided inside the rotating rod 31, and a mounting hole 33 is provided inside the rotating column 32. The mounting hole 33 communicates with the guide hole 311, and the diameter of the mounting hole 33 is larger than the diameter of the guide hole 311. One end of the support 4 is inserted into the mounting hole 33, and the support 4 is fixedly connected to the rotating column 32. The closed end of the cylinder 2 has a through hole 21 for the lead screw 5 to pass through, and the diameter of the through hole 21 is larger than the diameter of the lead screw 5.

[0039] Reference Figure 1 and Figure 2 The guide assembly 6 is installed on the outer wall of the cylinder 2. One end of the lead screw 5 is fixedly connected to the guide assembly 6, and the other end of the lead screw 5 passes through the through hole 21 and the support 4 in sequence. The lead screw 5 and the support 4 are threaded together. The end of the lead screw 5 passing through the support 4 is located in the guide hole 311, and the lead screw 5 and the guide hole 311 are clearance-fitted. The servo motor 1 drives the rotating part 3 to rotate, and the rotating part 3 drives the support 4 to rotate. The support 4 and the lead screw 5 are threaded together, thereby driving the lead screw 5 to extend and retract. The guide assembly 6 guides the lead screw 5, increasing the stability of the extension and retraction of the lead screw 5.

[0040] Reference Figure 1The guide assembly 6 includes a guide member 61 and a plurality of limiting screws 62. The guide member 61 is fixed to one end of the lead screw 5 that passes through the through hole 21. In this embodiment, there are four limiting screws 62, and all four limiting screws 62 are threaded into the outer wall of the cylinder 2, thereby fixing the four limiting screws 62 to the outer wall of the cylinder 2, increasing the convenience for workers to install and remove the limiting screws 62.

[0041] Continue to refer to Figure 1 The guide component 61 includes an integrally formed guide block 611 and a fixing block 612, which are perpendicular to each other. Four limiting screws 62 are arranged in a rectangular array on the outer wall of the cylinder 2. The guide block 611 passes between the four limiting screws 62, which are symmetrically distributed on both sides of the guide block 611. The screws of the four limiting screws 62 abut against the two side walls of the guide block 611. The side wall of the guide block 611 closest to the cylinder 2 abuts against the outer wall of the cylinder 2, while the nuts of the four limiting screws 62 abut against the side wall of the guide block 611 opposite to the cylinder 2.

[0042] Reference Figure 1 and Figure 2 The end of the lead screw 5 is integrally formed with an insertion rod 51, and the fixing block 612 has an insertion hole 613. The end of the insertion rod 51 facing away from the lead screw 5 passes through the insertion hole 613 on the fixing block 612. A positioning ring 8 is fitted onto the insertion rod 51, located between the fixing block 612 and the lead screw 5, with the fixing block 612 and the lead screw 5 respectively abutting against two opposite side walls of the positioning ring 8. A clamping post 12 is fixedly installed on the side of the fixing block 612 facing away from the positioning ring 8. The clamping post 12 is fixed to the insertion rod 51 by bolts. The clamping post 12 and the positioning ring 8 clamp the fixing block 612, thereby fixing the fixing block 612 to the lead screw 5, and further fixing the guide member 61 to the lead screw 5, increasing the convenience for workers to install and remove the guide member 61. The four limit screws 62 and the cylinder 2 guide the guide block 611, so that the guide block 611 slides stably along the length of the cylinder 2. The guide block 611 drives the fixed block 612 to slide stably along the length of the cylinder 2. The fixed block 612 drives the lead screw 5 to slide along the length of the cylinder 2, which increases the stability of the extension and retraction of the lead screw 5.

[0043] Reference Figure 2The outer wall of the rotating column 32 is threaded with a sleeve 7. A connecting block 41 is integrally formed at the end of the support 4 away from the servo motor 1. The connecting block 41 abuts against the side wall of the sleeve 7 near the sleeve 7. Multiple bolts pass through the connecting block 41, all of which are threaded into the sleeve 7, thereby fixing the support 4 to the sleeve 7, and thus fixing the support 4, sleeve 7, and rotating component 3 together. The rotating component 3 can simultaneously drive the sleeve 7 and the support 4 to rotate, thereby causing the lead screw 5 to extend and retract. Workers fix the connecting block 41 to the sleeve 7 using bolts, thereby fixing the support 4 to the rotating column 32, increasing the convenience of installing and disassembling the support 4. At the same time, the connecting block 41 provides a limiting effect on the sleeve 7, increasing the firmness of the sleeve 7 fixed to the rotating column 32.

[0044] Continue to refer to Figure 2 The inner wall of cylinder 2 has an annular groove 22, within which a bearing 10 is installed. A rotating column 32 passes through the bearing 10 and is fixedly connected to the inner wall of the bearing 10. The bearing 10 not only positions the rotating column 32 but also increases its rotational stability within cylinder 2. The outer wall of the rotating column 32 has multiple integrally formed abutment portions 34, evenly distributed circumferentially. These abutment portions 34 abut against one side wall of the bearing 10, and the bottom of the annular groove 22 abuts against the other side wall of the bearing 10. A clamping ring 9 is installed within the annular groove 22, with its side wall abutting against the bottom of the bearing 10 away from the annular groove 22. The clamping ring 9 and the abutment portions 34 abut against one side wall of the bearing 10, while the bottom of the annular groove 22 abuts against the other side wall of the bearing 10. The clamping ring 9, the abutment part 34, and the bottom of the annular groove 22 have a positioning effect on the bearing 10, which increases the stability of the bearing 10 rotating in the cylinder 2.

[0045] The implementation principle of the linear stepper motor in this application is as follows: the output shaft 11 is driven to rotate by the servo motor 1, the output shaft 11 drives the support 4 to rotate, the support 4 is threadedly engaged with the lead screw 5, thereby driving the lead screw 5 to extend and retract; during the extension and retraction of the lead screw 5, multiple limit screws 62 guide the guide member 61, so that the guide member 61 slides stably along the length direction of the cylinder 2, the guide member 61 drives the lead screw 5 to extend and retract stably along the length direction of the cylinder 2, and at the same time restricts the rotation of the lead screw 5, increasing the stability of the extension and retraction of the lead screw 5.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A linear stepper motor, characterized in that: The assembly includes a servo motor (1), a cylinder (2), a rotating component (3), a support (4), a lead screw (5), and a guide assembly (6). The output shaft (11) of the servo motor (1) is fixedly connected to the rotating component (3), and the end of the rotating component (3) away from the servo motor (1) is fixedly connected to the support (4). One end of the lead screw (5) passes through the support (4), and the lead screw (5) is threadedly engaged with the support (4). The cylinder (2) is fixed to the servo motor (1), and the rotating component (3) and the support (4) are both located inside the cylinder (2). A through hole (21) is provided at the end of the cylinder (2), and the end of the lead screw (5) away from the servo motor (1) passes through the through hole (21). The guide assembly (6) includes a guide member (61) and a plurality of limiting screws (62). The guide member (61) is fixed to one end of the lead screw (5) that passes through the through hole (21). The plurality of limiting screws (62) are all fixed to the cylinder (2). The guide member (61) passes between the plurality of limiting screws (62). The screws of the plurality of limiting screws (62) abut against the two side walls of the guide member (61). The side wall of the guide member (61) abuts against the outer side wall of the cylinder (2). The nuts of the plurality of limiting screws (62) abut against the side wall of the guide member (61) away from the cylinder (2). The rotating component (3) includes a rotating rod (31) and a rotating column (32). One end of the rotating rod (31) is fixedly connected to the output shaft (11) of the servo motor (1), and the other end of the rotating rod (31) is fixedly connected to the rotating column (32). A guide hole (311) is provided in the rotating rod (31), and an installation hole (33) is provided in the rotating column (32). The installation hole (33) is connected to the guide hole (311). One end of the lead screw (5) passing through the support (4) is located in the guide hole (311). The lead screw (5) is clearance-fitted with the guide hole (311). The support (4) is inserted into the installation hole (33). The support (4) is fixedly connected to the rotating column (32).

2. A linear stepper motor according to claim 1, characterized in that: The outer wall of the rotating column (32) is threaded with a sleeve (7), and a connecting block (41) is fixedly provided on the support (4). The side wall of the connecting block (41) abuts against the side wall of the sleeve (7). Multiple bolts are threaded through the connecting block (41), and all the bolts are threaded with the sleeve (7).

3. A linear stepper motor according to claim 2, characterized in that: The inner wall of the cylinder (2) is provided with an annular groove (22), and a bearing (10) is installed in the annular groove (22). The rotating column (32) passes through the bearing (10), and the rotating column (32) is fixedly connected to the inner wall of the bearing (10).

4. A linear stepper motor according to claim 3, characterized in that: The outer side wall of the rotating column (32) is fixedly provided with an abutment part (34), which abuts against one side wall of the bearing (10), and the bottom of the annular groove (22) abuts against the other side wall of the bearing (10).

5. A linear stepper motor according to claim 4, characterized in that: A clamping column (12) is installed in the annular groove (22), and the side wall of the clamping column (12) abuts against the bearing (10) away from the bottom of the annular groove (22).

6. A linear stepper motor according to claim 1, characterized in that: The end of the lead screw (5) is fixedly provided with a plug rod (51), and the guide member (61) is provided with a plug hole (613). The plug rod (51) passes through the plug hole (613) and is fixedly connected to the guide member (61).

7. A linear stepper motor according to claim 6, characterized in that: A positioning ring (8) is fitted on the insertion rod (51), the end of the lead screw (5) abuts against one side wall of the positioning ring (8), and the guide (61) abuts against the other side wall of the positioning ring (8).

8. A linear stepper motor according to claim 7, characterized in that: A clamping post (12) is fixedly provided on the insertion rod (51), and the clamping post (12) abuts against the side wall of the guide member (61) away from the positioning ring (8).

9. A linear stepper motor according to claim 8, characterized in that: Bolts are threaded through the clamping column (12) and the bolts are threaded into the insertion rod (51).

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