Stroke-adjustable push rod motor

Abstract

The application discloses a stroke-adjustable push rod motor, which comprises a shell, a power mechanism arranged on the shell and a transmission mechanism. The transmission mechanism comprises a pushing piece arranged in the shell in a sliding mode and a transmission assembly arranged on the shell and used for driving the pushing piece to slide. The shell is provided with two switch pieces arranged at intervals along the sliding direction of the pushing piece. The pushing piece is provided with a touch piece located between the two switch pieces. The switch pieces are electrically connected with the power mechanism. The shell is provided with a driving structure used for driving the switch pieces to slide along the sliding direction of the pushing piece. The driving structure can drive the two switch pieces to slide towards each other or away from each other, so that the stroke range of the pushing piece can be adjusted, and the push rod motor can be adjusted to eliminate the matching error in cooperation with a functional iron stand.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of push rod motors, and particularly to a push rod motor with adjustable stroke. BACKGROUND

[0002] The existing push rod motor drives a screw rod connected with the output shaft of the motor to rotate, the screw rod drives a turbine to rotate, the turbine drives a lead screw to rotate, a push rod on the lead screw axially slides along the length direction of the lead screw, and the push rod presses down the micro switch to stop the motor from rotating at the maximum or minimum stroke point, so that the push rod stops sliding. Since the positions of the two micro switches are fixed, the stroke of the push rod is also fixed.

[0003] At present, the push rod motor with fixed stroke is often used in functional iron racks. The functional iron racks themselves have matching errors, but the stroke of the existing push rod motor is fixed and cannot be adjusted to eliminate the matching errors with the functional iron racks, so that the functional iron racks are prone to be not tightly or too tightly collected, which needs to be improved. SUMMARY

[0004] The present application aims to provide a push rod motor with adjustable stroke, so as to solve the problem that the push rod motor cannot be adjusted to eliminate the matching errors with the iron racks.

[0005] The push rod motor with adjustable stroke provided by the present application adopts the following technical scheme:

[0006] The push rod motor with adjustable stroke comprises a housing, a power mechanism arranged in the housing, and a transmission mechanism, the transmission mechanism comprises a pushing member slidingly arranged in the housing and a transmission assembly arranged in the housing and used for driving the pushing member to slide, the housing is provided with two switch members arranged at intervals along the sliding direction of the pushing member, the pushing member is provided with a touch member located between the two switch members, the switch members are electrically connected with the power mechanism, and the housing is provided with a driving structure used for driving the switch members to slide along the sliding direction of the pushing member.

[0007] By adopting the above technical scheme, the power mechanism drives the transmission assembly to make the pushing member reciprocally slide in the housing, the pushing member drives the touch member to slide, and the two switch members are located at the front and back of the sliding direction of the touch member. When the touch member slides to contact the switch member, the switch member can cut off the power of the power mechanism to stop working, so as to stop the sliding of the pushing member, and the two switch members can limit the stroke range of the pushing member.

[0008] The driving structure can drive the two switch parts to slide towards each other or away from each other, so as to adjust the stroke range of the pushing part, the pushing part is used for cooperating with the functional iron stand, and the pushing motor can cooperate with the functional iron stand to eliminate the matching error.

[0009] Optionally, the power mechanism comprises a motor arranged in the shell, a worm arranged axially on an output shaft of the motor, the transmission assembly comprises a worm wheel rotatably arranged in the shell and a lead screw, the worm is engaged with the worm wheel, the lead screw is arranged axially and fixedly with the worm wheel, and the pushing part cooperates with the lead screw.

[0010] By adopting the above technical scheme, the motor drives the worm to rotate around the axis of the worm, the worm drives the worm wheel to rotate around the axis of the worm, and the worm wheel drives the lead screw to rotate around the axis of the worm wheel, so as to realize power transmission between the power mechanism and the transmission assembly, realize transmission between the lead screw and the pushing part, and the lead screw can drive the pushing part to slide along the length direction of the lead screw.

[0011] Optionally, the switch part is a micro switch arranged in the shell in a sliding mode, the driving structure is a screw rod corresponding to the micro switch, the screw rod is rotatably arranged in the shell, one end of the screw rod penetrates through the shell and is provided with an operation block, and the shell is provided with a locking part for limiting rotation of the operation block.

[0012] By adopting the above technical scheme, the micro switch adjusts the two micro switches through the two screw rods respectively, the distance between the two micro switches and the pushing part can be adjusted individually, more stroke requirements can be met, the applicability of the pushing motor is improved, and the cooperation between the pushing motor and the functional iron stand can be further facilitated.

[0013] The locking part limits the operation block, effectively reduces the rotation of the screw rod caused by external force in the process of use, and avoids affecting the cooperation between the pushing motor and the functional iron stand.

[0014] Optionally, the operation block is a polygonal block, the locking part is a locking plate arranged on the outer side of the shell, the locking plate is provided with a polygonal groove corresponding to the operation block and matched with the operation block, and the locking plate is connected with the shell through a screw.

[0015] By adopting the above technical scheme, when the distance between the two micro switches is adjusted, the polygonal block is clamped into the polygonal groove, the screw is tightened, the locking plate is abutted to the outer side wall of the shell to realize fixation, and the cooperation between the polygonal block and the polygonal groove can effectively limit the rotation of the operation block with the screw rod.

[0016] Optionally, the operation block is a circular block, the locking member is a pressure seat arranged to slide in the shell, the number of the pressure seat is at least two and the pressure seats are arranged oppositely between two operation blocks, the operation block is provided with a driven tooth-shaped part, the pressure seat is provided with a stop member matched with the driven tooth-shaped part, and the stop members of every two adjacent pressure seats are matched with each other.

[0017] By using the above technical scheme, when the interval adjustment of the two micro switches is completed, the pressure seat is driven to slide towards the direction close to the circular block, so that the stop member is matched with the driven tooth-shaped part and also matched with the adjacent stop member.

[0018] When the number of the pressure seat is preferably two, each circular block is matched with the stop members on the two pressure seats, and the stop members on the two pressure seats are matched with each other, so that the two stop members limit the rotation of the circular blocks and also limit the rotation of the stop members, and each stop member is also matched with two circular blocks, so as to limit the rotation of the two circular blocks.

[0019] Optionally, every two pressure seats are connected by an elastic rope, and the elastic rope is arranged in an "8" shape, so as to give the two pressure seats a tendency to slide towards each other.

[0020] By using the above technical scheme, the elastic rope is wound between the two pressure seats, and the elastic rope drives the two pressure seats to slide towards each other, so as to improve the stability of the matching between the stop members and the stop members and the matching between the driven tooth-shaped part and the stop members.

[0021] Meanwhile, when the two pressure seats are driven to slide away from each other, the elastic rope is elastically deformed and stretched under the force, and after the force is removed, the elastic rope is elastically reset to drive the two pressure seats to slide towards each other, so as to limit the separation of the two pressure seats.

[0022] Optionally, the stop member is a driving tooth-shaped part arranged on the pressure seat and matched with the driven tooth-shaped part.

[0023] By using the above technical scheme, the number of the pressure seat is preferably two, the driving tooth-shaped parts of the two pressure seats are respectively matched with the driven tooth-shaped part of one circular block, the driving tooth-shaped parts of the two pressure seats are matched with each other, and the driving tooth-shaped part of one pressure seat is matched with the driven tooth-shaped parts of two circular blocks, so that the two circular blocks are limited by the two pressure seats, and the rotation of the two circular blocks is limited.

[0024] Optionally, the stop member is a texture part arranged on the pressure seat and matched with the driven tooth-shaped part.

[0025] By adopting the technical scheme, the pressure seat is preferably two, the thread parts of the two pressure seats respectively abut against the driven tooth-shaped parts of one round block, and the thread parts of the two pressure seats abut against each other, so that the thread part of one pressure seat abuts against the driven tooth-shaped parts of two round blocks at the same time, the two round blocks are limited by the two pressure seats, and the effect of limiting rotation of the two round blocks is realized.

[0026] Meanwhile, the round block can abut against the thread part in any state, and the applicability of the operation block and the pressure seat is improved.

[0027] Optionally, the pushing piece is a push rod arranged in the shell in a telescopic sliding mode, and the contact part is sleeved on the push rod and threadedly connected with the lead screw.

[0028] By adopting the technical scheme, the lead screw drives the push rod to telescopically slide on the upper seat of the shell in the length direction of the lead screw, the push rod is arranged on the functional iron stand, and the footrest is retracted and extended.

[0029] Optionally, the pushing piece is a sliding block arranged on the outer side of the shell in a sliding mode, the sliding block is provided with a guide block threadedly connected with the lead screw, and the guide block penetrates through the shell.

[0030] By adopting the technical scheme, the lead screw drives the guide block to slide in the length direction of the lead screw, the guide block drives the sliding block to slide on the outer side wall of the shell, the internal volume of the shell can be reduced, and the shell can be conveniently used in a small space.

[0031] In summary, the present application has at least one of the following beneficial technical effects:

[0032] 1. The driving structure can drive the two switch pieces to slide towards each other or away from each other, so as to adjust the stroke range of the pushing piece, the pushing piece is used for cooperating with the functional iron stand, so as to realize the effect that the pushing motor can cooperate with the functional iron stand to eliminate the matching error;

[0033] 2. The microswitch adjusts the two microswitches through the two lead screws respectively, the distance between the two microswitches and the pushing piece can be adjusted individually, more stroke requirements can be met, the applicability of the pushing motor is improved, and the cooperation between the pushing motor and the functional iron stand can be further facilitated;

[0034] 3. When the two pressure seats slide away from each other, the elastic rope will be elastically deformed and stretched under the action of force, and after the action force is removed, the elastic rope is elastically reset to drive the two pressure seats to slide towards each other, so as to limit the mutual separation of the two pressure seats. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic view of the overall structure of embodiment 1 of the present application;

[0036] Figure 2 is a sectional view of embodiment 1 of the present application;

[0037] Figure 3 is a partial exploded view of embodiment 1 of the present application;

[0038] Figure 4 is an enlarged view of A of embodiment 1 of the present application;

[0039] Figure 5 is a structural view of the locking member of embodiment 1 of the present application;

[0040] Figure 6 is a structural view of embodiment 2 of the present application;

[0041] Figure 7 is a sectional view of embodiment 2 of the present application;

[0042] Figure 8 is a partial exploded view of embodiment 2 of the present application;

[0043] Figure 9 is a partial exploded view of embodiment 3 of the present application;

[0044] Figure 10 is a structural view of the locking member of embodiment 3 of the present application;

[0045] Figure 11 is a partial exploded view of embodiment 4 of the present application;

[0046] Figure 12 is a structural view of the locking member of embodiment 4 of the present application;

[0047] Figure 13 is a structural view of the pressure seat of embodiment 5 of the present application.

[0048] BRIEF DESCRIPTION OF REFERENCE NUMERALS: 1, housing; 11, mounting cavity; 12, limiting groove; 13, guide bar; 14, clamping groove; 15, sliding groove; 2, power mechanism; 21, motor; 22, worm; 3, transmission mechanism; 31, pushing member; 311, push rod; 312, sliding block; 3121, guide block; 32, transmission assembly; 321, worm wheel; 322, screw rod; 33, touch member; 331, touch block; 332, limiting block; 4, switch member; 41, micro switch; 42, guide groove; 5, driving structure; 51, screw rod; 52, operation block; 521, driven toothed portion; 6, locking member; 61, locking plate; 611, polygonal groove; 612, screw; 62, pressure seat; 621, stop member; 6211, driving toothed portion; 6212, thread portion; 6213, annular groove; 622, clamping block; 7, elastic rope. DETAILED DESCRIPTION

[0049] The application will be further described below in conjunction with the accompanying drawings. Figures 1-13 The application will be further described below in conjunction with the accompanying drawings.

[0050] Embodiment 1

[0051] The embodiment 1 of the application discloses a stroke-adjustable push rod motor.

[0052] With reference to Figure 1 , The embodiment 1 of the application discloses a stroke-adjustable push rod motor. Figure 2 , comprising a housing 1 internally hollowed to form a mounting cavity 11, a power mechanism 2 and a transmission mechanism 3 mounted to the housing 1, the housing 1 is composed of an upper housing and a lower housing fixedly connected, the transmission mechanism 3 comprises a pushing piece 31 mounted to the housing 1, a transmission assembly 32 mounted to the mounting cavity 11 of the housing 1 and used to drive the pushing piece 31 to slide, the pushing piece 31 is a push rod 311 slidably connected to the housing 1, part of the push rod 311 is located in the mounting cavity 11, one end of the push rod 311 penetrates through the housing 1, the inner wall of the housing 1 is mounted with two switch pieces 4 spaced apart along the sliding direction of the push rod 311, the push rod 311 is connected with a touch piece 33 located between the two switch pieces 4, the switch pieces 4 are electrically connected with the power mechanism 2, and the housing 1 is provided with a driving structure 5 used to drive the switch pieces 4 to slide along the sliding direction of the push rod 311.

[0053] With reference to Figure 2 The power mechanism 2 comprises a motor 21 fixedly connected to the outer side wall of the housing 1 and a worm 22 axially fixedly connected to the output shaft of the motor 21, the motor 21 is a conventional servo motor 21 and can rotate in two directions. The transmission assembly 32 comprises a worm wheel 321 and a screw rod 322 rotationally connected to the housing 1, the worm wheel 321 is axially sleeved on the screw rod 322, and the worm wheel 321 and the screw rod 322 are fixedly matched, the worm 22 is engaged with the worm wheel 321, the push rod 311 is sleeved on the screw rod 322, and the push rod 311 is threadedly connected with the screw rod 322, the touch piece 33 is a touch block 331 axially fixedly connected to one end of the push rod 311, the inner wall of the housing 1 is provided with a limiting groove 12 extending along the length direction of the screw rod 322, the touch block 331 is integrally formed with a limiting block 332 which is clamped into and slides in the limiting groove 12, the cooperation between the limiting block 332 and the limiting groove 12 plays a guiding and limiting role on the push rod 311, which can avoid the push rod 311 from rotating with the screw rod 322.

[0054] With reference to Figure 2The switch piece 4 is a micro switch 41 slidably connected to the inner wall of the shell 1, the micro switch 41 is electrically connected with the motor 21, the motor 21 is externally connected with a power supply, the two micro switches 41 are distributed along the length direction of the screw rod 322, the driving structure 5 is a screw rod 51 corresponding to the micro switch 41, the two screw rods 51 are arranged in parallel and are rotationally connected to the inner wall of the shell 1, one end of the screw rod 51 penetrates through the shell 1 and is axially fixedly connected with an operation block 52, the outer side wall of the shell 1 towards the operation block 52 is provided with a locking piece 6 for limiting the rotation of the operation block 52, the touch block 331 can abut against the micro switch 41 in the sliding process, triggering the micro switch 41, and the micro switch 41 controls the motor 21 to stop working. The inner side wall of the shell 1 is fixedly connected with a guide strip 13 extending along the length direction of the screw rod 322, the micro switch 41 is provided with a guide groove 42 slidably connected with the guide strip 13, and the cooperation of the guide strip 13 and the guide groove 42 plays a guiding and limiting role on the sliding of the micro switch 41, so that the micro switch 41 can be prevented from rotating with the screw rod 51.

[0055] With reference to Figure 3 , Figure 4 The operation block 52 is a circular block, which is circular or elliptical, the locking piece 6 is two pressure seats 62 slidably connected to the outer side wall of the shell 1, the pressure seats 62 are also circular or elliptical, the two pressure seats 62 are located between the two operation blocks 52, and the pressure seat 62 comprises a clamping block 622 in a “T” shape. The outer side wall of the shell 1 is provided with a clamping groove 14 for clamping the clamping block 622 and slidably connecting the clamping block 622. The operation block 52 is fixedly connected with a driven toothed portion 521 coaxial with the center line, the teeth of the driven toothed portion 521 are uniformly distributed along the circumferential direction of the operation block 52, the pressure seat 62 is provided with a stop piece 621 engaged with the driven toothed portion 521, and the stop pieces 621 on the two pressure seats 62 are engaged with each other.

[0056] With reference to Figure 4 , Figure 5 The stop piece 621 is a driving toothed portion 6211 fixedly connected to the pressure seat 62, the driving toothed portion 6211 is arranged coaxially with the pressure seat 62, the teeth of the driving toothed portion 6211 are uniformly distributed along the axis of the pressure seat 62, the driving toothed portion 6211 is engaged with the driven toothed portion 521, and the driving toothed portion 6211 is also engaged with the driving toothed portion 6211.

[0057] With reference to Figure 3 The two pressure seats 62 are connected by an elastic rope 7, the elastic rope 7 is a conventional elastic rope, the elastic rope 7 is arranged in an “8” shape, and the elastic rope 7 is wound around the circumferential side wall of the two pressure seats 62 respectively, and the elastic rope 7 gives the two pressure seats 62 a tendency to slide towards each other.

[0058] The implementation principle of the stroke-adjustable push rod motor in Embodiment 1 of the present application is:

[0059] By starting the motor 21, the motor 21 drives the worm 22 to rotate, the worm 22 drives the worm gear 321 to rotate, the worm gear 321 drives the lead screw 322 to rotate, the lead screw 322 drives the push rod 311 to reciprocate along the length direction of the lead screw 322 in the shell 1, the push rod 311 drives the touch block 331 to slide, and the two micro switches 41 are located in front and back of the sliding direction of the touch block 331. When the touch block 331 slides to contact the micro switch 41, the micro switch 41 can power off the motor 21 to stop working, so as to stop the sliding of the push rod 311, and the two micro switches 41 can limit the stroke range of the push rod 311.

[0060] The two screws 51 can drive the two micro switches 41 to slide towards each other or away from each other, so as to adjust the stroke range of the push rod 311. The push rod 311 is used for cooperating with the functional iron stand, so as to realize the function of eliminating the matching error by adjusting the functional iron stand to cooperate with the motor 21.

[0061] The driving toothed portions 6211 of the two pressure seats 62 are respectively engaged with the driven toothed portions 521 of the two round blocks, and the driving toothed portions 6211 of the two pressure seats 62 are engaged with each other. The driving toothed portion 6211 of one pressure seat 62 is engaged with the driven toothed portions 521 of the two round blocks at the same time, so that the two round blocks are limited by the two pressure seats 62, and the effect of limiting the rotation of the two round blocks is realized.

[0062] The elastic rope 7 is wound between the two pressure seats 62 at the same time, the elastic rope 7 drives the two pressure seats 62 to slide towards each other, and the stability of the engagement between the driving toothed portion 6211 and the driving toothed portion 6211 and the engagement between the driven toothed portion 521 and the driving toothed portion 6211 is improved.

[0063] Embodiment 2

[0064] The embodiment 2 of the present application discloses a stroke-adjustable push rod motor.

[0065] The difference between the embodiment 2 and the embodiment 1 is that, referring to Figure 6 , Figure 7 and Figure 8The pushing piece 31 is a sliding block 312 slidingly connected to the outer side wall of the shell 1, and the actuating piece 33 is a guide block 3121 fixedly connected to the sliding block 312 and facing the side wall of the shell 1. The guide block 3121 penetrates the shell 1 and is threadedly connected to the lead screw 322 and extends into the mounting cavity 11 of the shell 1. The outer side wall of the shell 1 is provided with a sliding groove 15 communicating with the mounting cavity 11 and extending along the length direction of the lead screw 322. The sliding groove 15 is used for clamping and slidingly connecting the guide block 3121 and can guide and limit the guide block 3121 to avoid rotating with the lead screw 322.

[0066] The embodiment 2 of the application is a stroke-adjustable push rod motor.

[0067] The guide block 3121 slides along the length direction of the lead screw 322, is slidingly connected to the sliding groove 15, and drives the sliding block 312 to slide on the outer side wall of the shell 1, so that the internal volume of the shell 1 is reduced and the push rod motor can be used in a small space.

[0068] Embodiment 3

[0069] The embodiment 3 of the application discloses a stroke-adjustable push rod motor.

[0070] The difference between the embodiment 3 and the embodiment 2 is that Figure 9 , Figure 10 The operation block 52 is a polygonal block (for example, a hexagonal block or the like), and the locking piece 6 is a locking plate 61 fixedly connected to the outer side wall of the shell 1 by a screw 612. The locking plate 61 is provided with a plurality of polygonal grooves 611 corresponding to the operation blocks 52 and matching with the polygonal blocks on the side facing the shell 1.

[0071] The embodiment 3 of the application is a stroke-adjustable push rod motor.

[0072] When the interval adjustment of the two micro switches 41 is completed, the operation block 52 is aligned with the polygonal groove 611, the operation block 52 is clamped into the polygonal groove 611, the screw 612 is tightened, the locking plate 61 is abutted against the outer side wall of the shell 1 to be fixed, and the cooperation between the operation block 52 and the polygonal groove 611 can effectively limit the rotation of the operation block 52 with the screw rod 51.

[0073] Embodiment 4

[0074] The embodiment 4 of the application is a stroke-adjustable push rod motor.

[0075] The difference between the embodiment 4 and the embodiment 2 is that Figure 11 , Figure 12The stopper 621 is a thread portion 6212 fixedly connected to the pressure seat 62, the thread portion 6212 is coaxially arranged with the pressure seat 62, the thread portion 6212 can be in contact with the driven tooth-shaped portion 521, and the thread portion 6212 is a thread staggered along the circumference of the pressure seat 62. The thread of the thread portion 6212 is in contact with the tooth surface of the driven tooth-shaped portion 521, and the rotation of the operation block 52 can be limited by friction.

[0076] The embodiment 4 of the application is a push rod motor with adjustable stroke, and the implementation principle is as follows:

[0077] The thread of the thread portion 6212 is in contact with the tooth surface of the driven tooth-shaped portion 521, and the rotation of the operation block 52 can be limited by friction.

[0078] Embodiment 5

[0079] The embodiment 5 of the application is based on the embodiment 1 and the embodiment 2, and the following content is added, for reference Figure 13 Both the two driving tooth-shaped portions 6211 are provided with annular grooves 6213 along the circumference, the elastic rope 7 is arranged in the shape of "8", and the elastic rope 7 is wound around the circumferential side wall of the two pressure seats 62, and at the same time, the elastic rope 7 is embedded in the two annular grooves 6213.

[0080] The embodiment 5 of the application is a push rod motor with adjustable stroke, and the implementation principle is as follows:

[0081] The elastic rope 7 is wound around the two pressure seats 62 at the same time, the elastic rope 7 is embedded in the two annular grooves 6213, and the stability of the cooperation between the elastic rope 7 and the two pressure seats 62 is improved.

[0082] The above are the preferred embodiments of the application, and are not used to limit the protection scope of the application, so that: all equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A stroke-adjustable push rod motor comprising a housing (1), a power mechanism (2) and a transmission mechanism (3) arranged in the housing (1), characterized in that: The transmission mechanism (3) comprises a pushing piece (31) slidingly arranged in the shell (1), a transmission assembly (32) arranged in the shell (1) and used for driving the pushing piece (31) to slide, the shell (1) is provided with two switch pieces (4) arranged at intervals along the sliding direction of the pushing piece (31), the pushing piece (31) is provided with a touch piece (33) located between the two switch pieces (4), the switch piece (4) is electrically connected with the power mechanism (2), and the shell (1) is provided with a driving structure (5) used for driving the switch piece (4) to slide along the sliding direction of the pushing piece (31). The switch piece (4) is a micro switch (41) slidingly arranged in the shell (1), the driving structure (5) is a screw rod (51) corresponding to the micro switch (41), the screw rod (51) is rotationally arranged in the shell (1), one end of the screw rod (51) penetrates through the shell (1) and is provided with an operation block (52), and the shell (1) is provided with a locking piece (6) used for limiting rotation of the operation block (52). The operation block (52) is a circular block, the locking piece (6) is a pressure seat (62) slidingly arranged in the shell (1), the number of the pressure seat (62) is at least two and the pressure seat (62) is arranged opposite to each other between two operation blocks (52), the operation block (52) is provided with a driven tooth-shaped part (521), the pressure seat (62) is provided with a stop piece (621) matched with the driven tooth-shaped part (521), and the stop pieces (621) of every two adjacent pressure seats (62) are matched with each other.

2. The stroke-adjustable push rod motor of claim 1, wherein: The power mechanism (2) comprises a motor (21) arranged in the shell (1) and a worm (22) arranged axially on an output shaft of the motor (21), the transmission assembly (32) comprises a worm wheel (321) rotationally arranged in the shell (1) and a lead screw (322), the worm (22) is meshed with the worm wheel (321), the lead screw (322) is arranged axially fixedly with the worm wheel (321), and the pushing piece (31) is matched with the lead screw (322).

3. The stroke-adjustable push rod motor of claim 1, wherein: Every two pressure seats (62) are connected through an elastic rope (7), the elastic rope (7) is arranged in the shape of "8", and the elastic rope (7) gives two pressure seats (62) a tendency to slide towards each other.

4. The stroke-adjustable push rod motor of claim 3, wherein: The stop piece (621) is a driving tooth-shaped part (6211) arranged in the pressure seat (62) and matched with the driven tooth-shaped part (521).

5. The stroke-adjustable push rod motor of claim 3, wherein: The stop piece (621) is a pattern part (6212) arranged in the pressure seat (62) and abutting against the driven tooth-shaped part (521).

6. The stroke-adjustable push rod motor of claim 2, wherein: The pushing piece (31) is a push rod (311) telescopically slidingly arranged in the shell (1), the touch piece (33) is a touch block (331) arranged in the push rod (311), and the push rod (311) is threadedly connected with the lead screw (322).

7. The stroke-adjustable push rod motor of claim 2, wherein: The pushing member (31) is a sliding block (312) slidingly arranged outside the shell (1), the touch member (33) is a guide block (3121) arranged on the sliding block (312) and threadedly connected with the screw rod (322), and the guide block (3121) penetrates through the shell (1).

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