Electric cylinder with switchable rotation angle of piston rod

Abstract

The electric cylinder comprises a shell, a driving assembly, the piston rod, a guide block and an anti-rotation assembly, the driving assembly is connected with the shell, the piston rod is installed in the shell, one end of the piston rod extends to the outside of the shell, the driving end of the driving assembly is connected with the piston rod, and the guide block is connected with the anti-rotation assembly. The guide block is arranged at the other end of the piston rod in a sleeving mode, and the anti-rotation assembly is connected with the inner wall of the shell and slidably connected with the guide block. When the anti-rotation assembly is separated from the guide block, rotation of the piston rod is not restrained by the guide block any more, and at the moment, the driving assembly can drive the piston rod to rotate along the XOZ face; when the anti-rotation assembly is not separated from the guide block, rotation of the piston is restrained by the guide block, and at the moment, the driving assembly can drive the piston rod to reciprocate in the Y-axis direction; by means of the movement mode that the anti-rotation assembly is in sliding connection with the guide block, the piston rod can be switched back and forth between linear motion and steering motion.

Description

Technical Field

[0001] The utility model relates to the technical field of electric cylinders, in particular to an electric cylinder with a switchable piston rod rotation angle. Background Art

[0002] Electric cylinders are products designed for continuous motion, low to high loads, and can be used many times during their service life. The core component of the electric cylinder is the lead screw assembly, which consists of a lead screw and a lead screw nut. Therefore, the electric cylinder can convert rotary motion into linear motion.

[0003] Currently, there are two forms of converting rotary motion into linear motion:

[0004] 1. Forward type, that is, the screw axial direction does not move, and the screw nut reciprocates axially on the screw;

[0005] 2. Reverse type, that is, the screw nut is axially stationary, and the screw reciprocates axially inside the screw nut;

[0006] Whether it is forward or reverse, the lead screw nut or lead screw can achieve linear motion, which requires the radial and circumferential directions between the lead screw nut and the lead screw to be fixed by an anti-rotation mechanism. Otherwise, the lead screw or lead screw nut will rotate in place, so the piston rod of the electric cylinder cannot rotate. However, in some specific occasions, the piston rod needs to have an angle steering function (for example: locking and pulling mechanism), so it is necessary to design an electric cylinder with a switchable piston rod rotation angle. Utility Model Content

[0007] The technical problem to be solved by the utility model is: in order to solve the technical problem that the piston rod of the existing electric cylinder cannot rotate, the utility model provides an electric cylinder with a switchable piston rod rotation angle, and through the improvement of the electric cylinder structure, the anti-rotation component can slide relative to the guide block to realize the angular steering function of the piston rod.

[0008] The technical solution adopted by the utility model to solve its technical problems is: an electric cylinder with a switchable piston rod rotation angle, comprising: a shell, a driving assembly, a piston rod, a guide block and an anti-rotation assembly, the driving assembly is connected to the shell, the piston rod is installed in the shell, and one end of the piston rod extends to the outside of the shell, the driving end of the driving assembly is connected to the piston rod, the guide block is sleeved on the other end of the piston rod, the anti-rotation assembly is connected to the inner wall of the shell, and the anti-rotation assembly is slidably connected to the guide block; wherein, when the anti-rotation assembly is disengaged from the guide block, the driving assembly can drive the piston rod to rotate along the XOZ plane.

[0009] Therefore, when the anti-rotation assembly is detached from the guide block, the rotation of the piston rod is no longer constrained by the guide block. At this time, the driving assembly can drive the piston rod to rotate along the XOZ plane; through the sliding connection between the anti-rotation assembly and the guide block, the piston rod can switch back and forth between linear motion and turning motion.

[0010] Furthermore, a plurality of anti-rotation grooves are formed on the outer peripheral surface of the guide block; the anti-rotation assembly comprises an anti-rotation rod, and the anti-rotation rod is slidably connected to the anti-rotation grooves.

[0011] Furthermore, the plurality of anti-rotation grooves are distributed in a ring shape with equal spacing, and the angle between two adjacent anti-rotation grooves is α.

[0012] Furthermore, the anti-rotation assembly also includes: a stopper and a spring, wherein the stopper and the spring are both located at one end of the anti-rotation rod close to the driving assembly, and both ends of the spring are respectively connected to the anti-rotation rod and the stopper.

[0013] Furthermore, the anti-rotation assembly also includes: a limiting protrusion and a limiting groove, the limiting protrusion is installed on the anti-rotation rod, the limiting groove is opened on the outer peripheral surface of the stopper, and one end of the limiting protrusion is inserted into the limiting groove.

[0014] Furthermore, the width of the limiting protrusion is d1, and the width of the limiting groove is d2; wherein d1<d2.

[0015] Furthermore, the drive assembly includes: a motor, a worm, a worm wheel and a lead screw nut, the motor is connected to the housing, the driving end of the motor is connected to the worm, the worm is meshed with the worm wheel, and the worm wheel is connected to the lead screw nut.

[0016] Furthermore, the piston rod passes through the worm gear and the screw nut, and the piston rod is threadedly connected to the screw nut.

[0017] Furthermore, it also includes: a sleeve, which is installed on the other side of the shell, the other end of the piston rod, the guide block and the anti-rotation component are all located in the sleeve, and the anti-rotation component is connected to the inner wall of the sleeve, and the outer circumferential surface of the sleeve is provided with a steering positioning sensor, a retraction positioning sensor and an extension positioning sensor.

[0018] Further, when the anti-rotation assembly is not separated from the guide block, the driving assembly can drive the piston rod to reciprocate along the Y-axis direction.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] When the anti-rotation assembly is detached from the guide block, the rotation of the piston rod is no longer constrained by the guide block. At this time, the driving assembly can drive the piston rod to rotate along the XOZ plane; when the anti-rotation assembly is not detached from the guide block, the rotation of the piston rod is constrained by the guide block. At this time, the driving assembly can drive the piston rod to reciprocate along the Y-axis direction; through the sliding connection between the anti-rotation assembly and the guide block, the piston rod can switch back and forth between linear motion and steering motion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a structural schematic diagram of the electric cylinder with switchable piston rod rotation angle of the utility model;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of the electric cylinder with switchable piston rod rotation angle of the utility model;

[0024] Figure 3 It is an exploded view of the piston rod, guide block and anti-rotation assembly of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the stopper of the anti-rotation assembly of the utility model in a squeezed state;

[0026] Figure 5 It is a schematic diagram of the opening of the anti-rotation groove of the utility model;

[0027] Figure 6 This is a position relationship diagram of the piston rod, the guide block and the anti-rotation assembly when the piston rod of the utility model is extended and retracted to the left.

[0028] In the figure: 1. housing; 2. drive assembly; 201. motor; 202. worm; 203. worm wheel; 204. lead screw nut; 3. piston rod; 4. guide block; 401. anti-rotation groove; 5. anti-rotation assembly; 501. anti-rotation rod; 5011. mounting groove; 502. block; 5021. inclined surface; 503. spring; 504. limiting protrusion; 505. limiting groove; 6. sleeve; 7. steering positioning sensor; 8. retraction positioning sensor; 9. extension positioning sensor; 10. damping clamp. DETAILED DESCRIPTION

[0029] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0030] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figures 1 to 6 As shown, the electric cylinder with switchable piston rod rotation angle of this embodiment includes: a shell 1, a driving component 2, a piston rod 3, a guide block 4 and an anti-rotation component 5, the driving component 2 is connected to the shell 1, the piston rod 3 is installed in the shell 1, and one end of the piston rod 3 extends to the outside of the shell 1, the driving end of the driving component 2 is connected to the piston rod 3, the guide block 4 is sleeved on the other end of the piston rod 3, the anti-rotation component 5 is connected to the inner wall of the shell 1, and the anti-rotation component 5 is slidably connected to the guide block 4; wherein, when the anti-rotation component 5 is disengaged from the guide block 4, the driving component 2 can drive the piston rod 3 to rotate along the XOZ plane, and when the anti-rotation component 5 is not disengaged from the guide block 4, the driving component 2 can drive the piston rod 3 to reciprocate along the Y-axis direction. Therefore, when the anti-rotation component 5 is detached from the guide block 4, the rotation of the piston rod 3 is no longer constrained by the guide block 4. At this time, the driving component 2 can drive the piston rod 3 to rotate along the XOZ plane; when the anti-rotation component 5 is not detached from the guide block 4, the rotation of the piston rod 3 is constrained by the guide block 4. At this time, the driving component 2 can drive the piston rod 3 to reciprocate along the Y-axis direction; through the sliding connection between the anti-rotation component 5 and the guide block 4, the piston rod 3 can switch back and forth between linear motion and steering motion.

[0033] In this embodiment, a plurality of anti-rotation grooves 401 are formed on the outer circumferential surface of the guide block 4; the anti-rotation assembly 5 includes an anti-rotation rod 501, which is slidably connected to the anti-rotation groove 401. When the anti-rotation rod 501 is separated from the anti-rotation groove 401, the piston rod 3 can achieve a turning movement; when the anti-rotation rod 501 is not separated from the anti-rotation groove 401, the piston rod 3 can achieve a linear movement.

[0034] In this embodiment, the plurality of anti-rotation grooves 401 are distributed in an annular shape with equal spacing, and the angle between two adjacent anti-rotation grooves 401 is α. Thus, the single turning angle of the piston rod 3 is α. The value of α can be set according to actual needs. For example, in this embodiment, four anti-rotation grooves 401 are provided, and the angle between two adjacent anti-rotation grooves 401 is α=90°. That is, the piston rod 3 can rotate 90° at a time.

[0035] In this embodiment, the anti-rotation component 5 also includes: a stop block 502, a spring 503, a limiting protrusion 504 and a limiting groove 505. The stop block 502 and the spring 503 are both located at one end of the anti-rotation rod 501 close to the driving component 2, and the two ends of the spring 503 are respectively connected to the anti-rotation rod 501 and the stop block 502. The limiting protrusion 504 is installed on the anti-rotation rod 501, and the limiting groove 505 is opened on the outer peripheral surface of the stop block 502, and one end of the limiting protrusion 504 is inserted into the limiting groove 505. The width of the limiting protrusion 504 is d1, and the width of the limiting groove 505 is d2; wherein, d1<d2. Therefore, when the spring 503 is in an uncompressed state, the stopper 502 is in a pop-up state, and under the action of the limiting protrusion 504 and the limiting groove 505, the stopper 502 will not separate from the anti-rotation rod 501; d1<d2, which can ensure that the limiting protrusion 504 slides in the limiting groove 505.

[0036] Specifically, a mounting groove 5011 is formed at one end of the anti-rotation rod 501 close to the driving assembly 2 , the stopper 502 and the spring 503 are both located in the mounting groove 5011 , and one end of the stopper 502 extends to the outside of the mounting groove 5011 .

[0037] Specifically, a side of the stopper 502 away from the spring 503 is provided with an inclined surface 5021, and the design of the inclined surface 5021 can realize the steering function of the piston rod 3 (that is, when the piston rod 3 needs to rotate, the existence of the inclined surface 5021 will not hinder the rotation of the piston rod 3). When the piston rod 3 rotates, it rotates along the inclined direction of the inclined surface 5021. In this embodiment, the piston rod 3 rotates counterclockwise.

[0038] In this embodiment, the driving assembly 2 includes: a motor 201, a worm 202, a worm wheel 203 and a screw nut 204. The motor 201 is connected to the housing 1, the driving end of the motor 201 is connected to the worm 202, the worm 202 is meshed with the worm wheel 203, the worm wheel 203 is connected to the screw nut 204, the piston rod 3 passes through the worm wheel 203 and the screw nut 204, and the piston rod 3 is threadedly connected to the screw nut 204. Therefore, when the motor 201 is started, the rotation of the motor 201 drives the rotation of the worm 202, so that the worm wheel 203 rotates, and then the screw nut 204 rotates, so as to realize the linear motion and steering motion of the piston rod 3.

[0039] In this embodiment, it also includes: a sleeve 6, which is installed on the other side of the housing 1, and the other end of the piston rod 3, the guide block 4 and the anti-rotation assembly 5 are all located in the sleeve 6, and the anti-rotation assembly 5 is connected to the inner wall of the sleeve 6, and the outer circumferential surface of the sleeve 6 is provided with a steering positioning sensor 7, a retraction positioning sensor 8 and an extension positioning sensor 9. Therefore, the steering positioning sensor 7 can be used to determine whether the steering movement of the piston rod 3 is in place; the retraction positioning sensor 8 can be used to determine whether the piston rod 3 is retracted to the right in place; and the extension positioning sensor 9 can be used to determine whether the piston rod 3 is extended to the left in place.

[0040] In this embodiment, a damping hoop 10 is arranged inside the housing 1 .

[0041] The movement process of the piston rod 3 of the electric cylinder of the utility model is: start the motor 201, drive the motor 201 to rotate clockwise, and under the cooperation of the worm 202, the worm wheel 203, and the screw nut 204, drive the piston rod 3 and the guide block 4 to move leftward (the guide block 4 slides in the anti-rotation component 5, and the guide block 4 does not break away from the restraint of the anti-rotation component 5);

[0042] When the extension positioning sensor 9 detects that the piston rod 3 is extended and retracted to the left (i.e., the guide block 4 is just out of the anti-rotation rod 501, but a part of the stop block 502 is still located in the anti-rotation groove 401, and the right side surface of the guide block 4 is in contact with the left side surface of the anti-rotation rod 501), the motor 201 drive shaft continues to be controlled to rotate clockwise, and with the cooperation of the worm 202, the worm wheel 203, and the screw nut 204, the piston rod 3 and the guide block 4 are driven to rotate (the guide block 4 is out of the restraint of the anti-rotation component 5, and at the same time, under the action of the friction between the damping hoop 10 and the screw nut 204 and the piston rod 3, the screw nut 204 drives the piston rod 3 and the guide block 4 to rotate in place). At this time, the spring 503 is in a compressed state, and the stop block 502 abuts against the right end surface of the guide block 4;

[0043] When the steering positioning sensor 7 detects that the piston rod 3 has reached the steering position, the steering movement of the piston rod 3 is completed. Under the action of the spring 503, the stopper 502 is inserted into the anti-rotation groove 401, and the drive shaft of the control motor 201 rotates counterclockwise. Under the cooperation of the worm 202, the worm wheel 203, and the screw nut 204, the piston rod 3 and the guide block 4 are driven to move rightward (the guide block 4 slides in the anti-rotation assembly 5, and the anti-rotation rod 501 is re-located in the anti-rotation groove 401);

[0044] When the retraction positioning sensor 8 detects that the piston rod 3 has retracted to the right, the motor 201 is turned off, and the piston rod 3 and the guide block 4 cannot continue to move to the right, so that the left end of the guide block 4 is just stuck on the anti-rotation rod 501, avoiding the subsequent steering movement of the piston rod 3 and the guide block 4 to be uncontrollable due to the piston rod 3 and the guide block 4 continuing to move to the right.

[0045] To sum up, in the present invention, when the anti-rotation component 5 is detached from the guide block 4, the rotation of the piston rod 3 is no longer constrained by the guide block 4. At this time, the driving component 2 can drive the piston rod 3 to rotate along the XOZ plane; when the anti-rotation component 5 is not detached from the guide block 4, the rotation of the piston rod 3 is constrained by the guide block 4. At this time, the driving component 2 can drive the piston rod 3 to reciprocate along the Y-axis direction; through the sliding connection between the anti-rotation component 5 and the guide block 4, the piston rod 3 can switch back and forth between linear motion and steering motion.

[0046] The above description is based on the ideal embodiment of the utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An electric cylinder with a switchable piston rod rotation angle, characterized in that: include: a housing (1), and A drive assembly (2), the drive assembly (2) being connected to the housing (1); A piston rod (3), wherein the piston rod (3) is installed in the housing (1), and one end of the piston rod (3) extends to the outside of the housing (1), and the driving end of the driving assembly (2) is connected to the piston rod (3); A guide block (4), wherein the guide block (4) is sleeved on the other end of the piston rod (3); an anti-rotation component (5), the anti-rotation component (5) being connected to the inner wall of the housing (1), and the anti-rotation component (5) being slidably connected to the guide block (4); When the anti-rotation assembly (5) is separated from the guide block (4), the driving assembly (2) can drive the piston rod (3) to rotate along the XOZ plane.

2. The electric cylinder with switchable piston rod rotation angle according to claim 1, characterized in that: A plurality of anti-rotation grooves (401) are provided on the outer peripheral surface of the guide block (4); The anti-rotation component (5) comprises: An anti-rotation rod (501), wherein the anti-rotation rod (501) is slidably connected to the anti-rotation groove (401).

3. The electric cylinder with switchable piston rod rotation angle according to claim 2, characterized in that: The plurality of anti-rotation grooves (401) are distributed in a ring shape at equal intervals, and the angle between two adjacent anti-rotation grooves (401) is α.

4. The electric cylinder with switchable piston rod rotation angle according to claim 2, characterized in that: The anti-rotation component (5) further comprises: A stopper (502) and a spring (503), wherein the stopper (502) and the spring (503) are both located at one end of the anti-rotation rod (501) close to the driving assembly (2), and two ends of the spring (503) are respectively connected to the anti-rotation rod (501) and the stopper (502).

5. The electric cylinder with switchable piston rod rotation angle according to claim 4, characterized in that: The anti-rotation component (5) further comprises: A limiting protrusion (504) and a limiting groove (505), wherein the limiting protrusion (504) is mounted on the anti-rotation rod (501), the limiting groove (505) is formed on the outer peripheral surface of the stopper (502), and one end of the limiting protrusion (504) is inserted into the limiting groove (505).

6. The electric cylinder with switchable piston rod rotation angle according to claim 5, characterized in that: The width of the limiting protrusion (504) is d1, and the width of the limiting groove (505) is d2; Among them, d1<d2.

7. The electric cylinder with switchable piston rod rotation angle according to claim 1, characterized in that: The driving assembly (2) comprises: A motor (201), a worm (202), a worm wheel (203) and a screw nut (204), wherein the motor (201) is connected to the housing (1), the driving end of the motor (201) is connected to the worm (202), the worm (202) is meshed with the worm wheel (203), and the worm wheel (203) is connected to the screw nut (204).

8. The electric cylinder with switchable piston rod rotation angle according to claim 7, characterized in that: The piston rod (3) passes through the worm gear (203) and the screw nut (204), and the piston rod (3) is threadedly connected to the screw nut (204).

9. The electric cylinder with switchable piston rod rotation angle according to claim 1, characterized in that: Also includes: A sleeve (6), wherein the sleeve (6) is installed on the other side of the housing (1), the other end of the piston rod (3), the guide block (4) and the anti-rotation assembly (5) are all located in the sleeve (6), and the anti-rotation assembly (5) is connected to the inner wall of the sleeve (6), and the outer peripheral surface of the sleeve (6) is provided with a steering positioning sensor (7), a retraction positioning sensor (8) and an extension positioning sensor (9).

10. The electric cylinder with switchable piston rod rotation angle according to claim 1, characterized in that: When the anti-rotation component (5) has not separated from the guide block (4), the driving component (2) can drive the piston rod (3) to reciprocate along the Y-axis direction.

Images