Electric cylinder with external limiting mechanism

Abstract

The electric cylinder with the external limiting mechanism comprises a first cylinder barrel, a first piston rod and a limiting assembly, the first piston rod is installed in the first cylinder barrel, the right end of the first piston rod extends out of the first cylinder barrel, the limiting assembly is located outside the first cylinder barrel, the left end of the limiting assembly is connected with the first cylinder barrel, and the right end of the limiting assembly is connected with the second cylinder barrel. The right end of the limiting assembly is connected with the right end of the first piston rod, the limiting assembly comprises a magnetic ring and a limiting switch, the magnetic ring can move along with movement of the first piston rod, and when an induction point of the limiting switch induces a magnetic field of the magnetic ring, the first piston rod stops moving. According to the design mode that the limiting assembly is arranged outside the cylinder barrel, the limiting assembly can be conveniently installed, maintained and replaced, the installation, maintenance and replacement difficulty of the limiting assembly is lowered, and the time cost of installation, maintenance and replacement of the limiting assembly is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric cylinders, in particular to an electric cylinder with an external limiting mechanism. Background Art

[0002] Electric cylinders are products designed for continuous motion, low to high loads, and can be used multiple times within their service life. They are widely used on maritime vessels. When debugging maritime vessel opening and closing doors, ramps, ramp covers and other equipment, it is necessary to limit the piston rod of the electric cylinder to prevent the piston rod from overshooting, causing internal collisions in the electric cylinder and damaging the electric cylinder structure. At present, the limit switch of the electric cylinder is installed inside the electric cylinder. However, due to the limitations of processing accuracy and assembly accuracy, the installation position of the limit switch is too small, which is not convenient for the installation of the limit switch. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the technical problem that the existing electric cylinder limit switch is difficult to install in the electric cylinder, the utility model provides an electric cylinder with an external limit mechanism, and the limit component is arranged on the outside of the electric cylinder, which can realize the convenient installation of the limit component.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an electric cylinder with an external limit mechanism, comprising: a first cylinder barrel, a first piston rod and a limit assembly, the first piston rod is installed in the first cylinder barrel, and the right end of the first piston rod extends to the outside of the first cylinder barrel, the limit assembly is located outside the first cylinder barrel, the left end of the limit assembly is connected to the first cylinder barrel, and the right end of the limit assembly is connected to the right end of the first piston rod, the limit assembly comprises: a magnetic ring and a limit switch, the magnetic ring can move with the movement of the first piston rod, when the sensing point of the limit switch senses the magnetic field of the magnetic ring, the first piston rod stops moving.

[0005] Furthermore, the limiting assembly also includes: a second cylinder and a second piston rod, the left end of the second cylinder is connected to the first cylinder, the right end of the second piston rod is connected to the right end of the first piston rod, and the left end of the second piston rod is inserted into the second cylinder and is slidably connected to the second cylinder.

[0006] Furthermore, the magnetic ring is installed on the left end of the second piston rod, and the limit switch is installed on the outer circumferential surface of the second cylinder.

[0007] Furthermore, a slide groove is provided on the outer peripheral surface of the second cylinder along the axial direction of the second cylinder, and the limit switch is located in the slide groove.

[0008] Further, the distance between the left end of the second cylinder and the first cylinder is d1, and the distance between the right end of the second cylinder and the first cylinder is d2; wherein d1≥d2.

[0009] Furthermore, the limiting assembly also includes: a first connecting member, and two ends of the first connecting member are respectively connected to the left ends of the first cylinder and the second cylinder.

[0010] Furthermore, the limiting assembly also includes: a second connecting member, and two ends of the second connecting member are respectively connected to the right end of the first piston rod and the right end of the second piston rod.

[0011] Further, when d1>d2, the first connecting member is rotationally connected to the left end of the second cylinder, and the second connecting member is rotationally connected to the right end of the second piston rod.

[0012] Furthermore, a ball screw nut pair is disposed inside the first piston rod, and a left end of the ball screw nut pair extends to the outside of the first piston rod.

[0013] Furthermore, it also includes: a driving component, the output end of the driving component is connected to the ball screw nut pair.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The design method of setting the limit component outside the cylinder can realize convenient installation, maintenance and replacement of the limit component, reduce the difficulty of installation, maintenance and replacement of the limit component, and save the time cost of installation, maintenance and replacement of the limit component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of the electric cylinder with an external limiting mechanism in Example 1;

[0018] Figure 2 It is a structural schematic diagram of the position relationship between the magnetic ring and the limit switch of the utility model;

[0019] Figure 3 This is a schematic diagram of the positional relationship between the first cylinder and the second cylinder in Example 1;

[0020] Figure 4 This is a schematic diagram of the structure of the electric cylinder with an external limiting mechanism in Example 2;

[0021] Figure 5 This is a schematic structural diagram of the positional relationship between the first cylinder and the second cylinder in Example 2.

[0022] In the figure: 1. first cylinder; 2. first piston rod; 201. ball screw nut pair; 202. rod head; 3. limit assembly; 301. magnetic ring; 302. limit switch; 303. second cylinder; 3031. slide groove; 304. second piston rod; 305. first connecting member; 306. second connecting member; 4. drive assembly; 401. motor; 402. reducer; 403. gear box unit. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Embodiment 1:

[0027] like Figures 1 to 3As shown, an electric cylinder with an external limit mechanism includes: a first cylinder barrel 1, a first piston rod 2 and a limit assembly 3, the first piston rod 2 is installed in the first cylinder barrel 1, and the right end of the first piston rod 2 extends to the outside of the first cylinder barrel 1, the limit assembly 3 is located outside the first cylinder barrel 1, the left end of the limit assembly 3 is connected to the first cylinder barrel 1, and the right end of the limit assembly 3 is connected to the right end of the first piston rod 2, and the limit assembly 3 includes: a magnetic ring 301 and a limit switch 302, the magnetic ring 301 can move with the movement of the first piston rod 2, when the sensing point of the limit switch 302 senses the magnetic field of the magnetic ring 301, the first piston rod 2 stops moving. Therefore, the design method of arranging the limit assembly 3 outside the cylinder barrel can realize the convenient installation, maintenance and replacement of the limit assembly 3, reduce the difficulty of installation, maintenance and replacement of the limit assembly 3, and save the time cost of installation, maintenance and replacement of the limit assembly 3.

[0028] In other words, during the installation, maintenance and replacement of the limit component 3, the installation, maintenance and replacement of the limit component 3 can be achieved only by operating the external device on the outside of the electric cylinder, thereby enabling convenient adjustment, reducing difficulty, saving time and cost, and adjusting the limit switch 302 over a wide range. At the same time, the flexibility of external adjustment and the advantages of the adjustment range make the use of the electric cylinder more efficient, and the limit switch 302 can be fine-tuned according to specific work requirements, thereby giving full play to the performance of the electric cylinder and improving work efficiency and production capacity.

[0029] In this embodiment, the limit assembly 3 also includes: a second cylinder 303, a second piston rod 304, a first connecting member 305 and a second connecting member 306. The left end of the second cylinder 303 is connected to the first cylinder 1, the right end of the second piston rod 304 is connected to the right end of the first piston rod 2, the left end of the second piston rod 304 is inserted into the second cylinder 303 and is slidably connected to the second cylinder 303, the magnetic ring 301 is installed on the left end of the second piston rod 304, the limit switch 302 is installed on the outer circumferential surface of the second cylinder 303, and the second piston rod 304 is connected to the right end of the first piston rod 2. The outer circumferential surface of the second cylinder 303 is provided with a slide groove 3031 along the axial direction of the second cylinder 303, and the limit switch 302 is located in the slide groove 3031. The two ends of the first connecting member 305 are respectively connected to the first cylinder 1 and the left end of the second cylinder 303, and the two ends of the second connecting member 306 are respectively connected to the right end of the first piston rod 2 and the right end of the second piston rod 304. The distance between the left end of the second cylinder 303 and the first cylinder 1 is d1, and the distance between the right end of the second cylinder 303 and the first cylinder 1 is d2, and d1>d2.

[0030] Specifically, during installation, the installation position of the limit switch 302 can be adjusted by sliding the limit switch 302 and the slide groove 3031. When in use, the limit switch 302 is fixed in the slide groove 3031, and the position of the limit switch 302 can be accurately adjusted according to actual needs, which is more flexible to adapt to different work requirements. At the same time, the adjustment range of the limit switch 302 is larger, which can meet a wider range of work needs.

[0031] In other words, during the installation, maintenance and replacement of the limit assembly 3, it is only necessary to operate the outside of the electric cylinder through an external device to achieve a large range of adjustment of the limit switch 302. At the same time, the flexibility of external adjustment and the advantages of the adjustment range make the use of the electric cylinder more efficient, and the limit switch 302 can be fine-tuned according to more specific work requirements, thereby giving full play to the performance of the electric cylinder and improving work efficiency and production capacity.

[0032] For example, the fixing methods include cable ties, clamps, glue, tape, and screws.

[0033] Specifically, the limiting assembly 3 is installed outside the electric cylinder in a horizontal state.

[0034] In this embodiment, a ball screw nut pair 201 is disposed inside the first piston rod 2 , and the left end of the ball screw nut pair 201 extends to the outside of the first piston rod 2 .

[0035] Specifically, a rod head 202 is installed at the right end of the first piston rod 2, and the rod head 202 is threadedly connected to the first piston rod 2. After the threads are connected, glue is applied to prevent the rod head 202 and the first piston rod 2 from loosening.

[0036] In this embodiment, it also includes: a driving assembly 4, which includes: a motor 401, a reducer 402 and a gear box unit 403, the motor 401 is connected to the reducer 402, the reducer 402 is connected to the gear box unit 403, the gear box unit 403 is connected to the first cylinder 1, the output end of the motor 401 is connected to the input end of the reducer 402, the output end of the reducer 402 is connected to the input end of the gear box unit 403, and the output end of the gear box unit 403 is connected to the left end of the ball screw nut pair 201. Therefore, the reducer 402 can reduce the speed of the motor 401 and increase the output torque of the motor 401 at the same time; start the motor 401, and under the cooperation of the reducer 402, the gear box unit 403 and the ball screw nut pair 201, the first piston rod 2 can reciprocate along the axial direction of the first piston rod 2.

[0037] In this embodiment, the limit switch 302 and the motor 401 are both connected to the remote terminal. When the sensing point of the limit switch 302 senses the magnetic field of the magnetic ring 301, the magnetic ring 301 and the limit switch 302 can generate an induction signal. The limit switch 302 converts the induction signal into an electrical signal and sends it to the remote terminal. The remote terminal sends a stop command to the motor 401, thereby controlling the first piston rod 2 to stop moving. For example, the remote terminal is a host computer or a slave computer.

[0038] The working process of the electric cylinder of the utility model is: start the motor 401, and under the cooperation of the reducer 402, the gear box unit 403 and the ball screw nut pair 201, the first piston rod 2 moves rightward along the axial direction of the first piston rod 2, and the second piston rod 304 synchronously follows the rightward movement of the first piston rod 2 and moves rightward along the axial direction of the second piston rod 304;

[0039] When the sensing point of the limit switch 302 senses the magnetic field of the magnetic ring 301, the limit switch 302 generates an induction signal, and the limit switch 302 converts the induction signal into an electrical signal and sends it to the remote terminal, and remotely sends a stop command of the motor 401 to the motor 401, and the motor 401 stops running. The first piston rod 2 stops moving to the right as the motor 401 stops running, so as to limit the moving stroke of the first piston rod 2.

[0040] Embodiment 2:

[0041] like Figures 4 to 5 As shown, the difference from Example 1 is that d1>d2, and the first connecting member 305 is rotatably connected to the left end of the second cylinder 303, and the second connecting member 306 is rotatably connected to the right end of the second piston rod 304. Specifically, the limit assembly 3 is installed outside the electric cylinder in an inclined state. Compared with the horizontal state of Example 1, the inclined state can adjust the installation angle of the limit assembly 3 to avoid the first piston rod 2 from getting stuck during the extension process.

[0042] To sum up, the design method of setting the limit component 3 outside the cylinder can achieve convenient installation, maintenance and replacement of the limit component 3, reduce the difficulty of installation, maintenance and replacement of the limit component 3, and save the time cost of installation, maintenance and replacement of the limit component 3; can accurately adjust the position of the limit switch 302 according to actual needs, and more flexibly adapt to different work requirements; the limit switch 302 has a larger adjustment range and can meet a wider range of work needs.

[0043] 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 an external limit mechanism, characterized in that: include: a first cylinder (1), and A first piston rod (2), the first piston rod (2) being installed in the first cylinder barrel (1), and the right end of the first piston rod (2) extending to the outside of the first cylinder barrel (1); A limit assembly (3), the limit assembly (3) is located outside the first cylinder (1), the left end of the limit assembly (3) is connected to the first cylinder (1), and the right end of the limit assembly (3) is connected to the right end of the first piston rod (2), and the limit assembly (3) comprises: A magnetic ring (301) and a limit switch (302), wherein the magnetic ring (301) can move along with the movement of the first piston rod (2), and when the sensing point of the limit switch (302) senses the magnetic field of the magnetic ring (301), the first piston rod (2) stops moving.

2. The electric cylinder with an external limiting mechanism according to claim 1, characterized in that: The limiting component (3) further comprises: A second cylinder (303) and a second piston rod (304), wherein the left end of the second cylinder (303) is connected to the first cylinder (1), the right end of the second piston rod (304) is connected to the right end of the first piston rod (2), and the left end of the second piston rod (304) is inserted into the second cylinder (303) and is slidably connected to the second cylinder (303).

3. The electric cylinder with an external limiting mechanism according to claim 2, characterized in that: The magnetic ring (301) is installed on the left end of the second piston rod (304), and the limit switch (302) is installed on the outer peripheral surface of the second cylinder (303).

4. The electric cylinder with an external limiting mechanism according to claim 3, characterized in that: A slide groove (3031) is provided on the outer peripheral surface of the second cylinder (303) along the axial direction of the second cylinder (303), and the limit switch (302) is located in the slide groove (3031).

5. The electric cylinder with an external limiting mechanism according to claim 2, characterized in that: The distance between the left end of the second cylinder (303) and the first cylinder (1) is d1, and the distance between the right end of the second cylinder (303) and the first cylinder (1) is d2; Among them, d1≥d2.

6. The electric cylinder with an external limiting mechanism according to claim 5, characterized in that: The limiting component (3) also includes: A first connecting member (305), wherein two ends of the first connecting member (305) are respectively connected to the left ends of the first cylinder (1) and the second cylinder (303).

7. The electric cylinder with an external limiting mechanism according to claim 6, characterized in that: The limiting component (3) further comprises: A second connecting member (306), wherein two ends of the second connecting member (306) are respectively connected to the right end of the first piston rod (2) and the right end of the second piston rod (304).

8. The electric cylinder with an external limiting mechanism according to claim 7, characterized in that: When d1>d2, the first connecting member (305) is rotationally connected to the left end of the second cylinder (303), and the second connecting member (306) is rotationally connected to the right end of the second piston rod (304).

9. The electric cylinder with an external limiting mechanism according to claim 1, characterized in that: A ball screw nut pair (201) is arranged inside the first piston rod (2), and the left end of the ball screw nut pair (201) extends to the outside of the first piston rod (2).

10. The electric cylinder with an external limiting mechanism according to claim 9, characterized in that: Also includes: A drive assembly (4), wherein an output end of the drive assembly (4) is connected to the ball screw nut pair (201).

Images