Electric cylinder

Abstract

The utility model relates to the technical field of mechanical transmission devices, and discloses an electric cylinder which comprises a lead screw, a nut, a cylinder rod and a guide mandrel. The nut is in threaded connection with the lead screw, a cavity is formed in the cylinder rod, the cylinder rod is arranged outside the lead screw in a sleeving mode, one end of the cylinder rod is connected with the nut, and the nut drives the cylinder rod to reciprocate along the lead screw; a guide cavity is formed in the lead screw, one end of the guide mandrel is slidably connected with the inner wall of the guide cavity, and the other end of the guide mandrel is connected with the interior of the cavity. When the cylinder rod extends out, part of the guide core shaft is pulled out from the interior of the lead screw by the cylinder rod to fill a cavity of the cylinder rod and improve the lateral bearing capacity of the cylinder rod, so that the structural strength of the device is improved, and the service life of the device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical transmission device technical field, in particular to a kind of electric cylinder. BACKGROUND

[0002] In prior art, electric cylinder is linear motion device that generates certain thrust, the mechanism for realizing linear motion in electric cylinder is usually screw nut mechanism, cylinder rod in electric cylinder is connected with the nut of screw nut mechanism, cylinder rod is usually provided with hollow structure, is set in the outside of screw, in some application scenarios, in addition to axial force, cylinder rod will also bear lateral force with the angle of existence in positive direction, the lateral bearing capacity of hollow structure cylinder rod is lower, resulting in shorter service life of electric cylinder. SUMMARY

[0003] The utility model aims at providing a kind of electric cylinder, to improve the structural strength of cylinder rod, prolong the service life of electric cylinder.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] A kind of electric cylinder, comprising: screw, nut, cylinder rod and guide mandrel;The nut is threadedly connected on the screw, the inside of the cylinder rod is provided with cavity, the cylinder rod is set in the outside of the screw, and one end of the cylinder rod is connected with the nut, the nut drives the cylinder rod reciprocating motion along the screw;The inside of the screw is provided with guide cavity, one end of the guide mandrel is slidably connected with the inner wall of the guide cavity, the other end of the guide mandrel is connected with the inside of the cavity.

[0006] Preferably, the guide mandrel is a rod structure, one end of the rod structure is slidably connected to the inner wall of the guide cavity, and the other end of the rod structure is connected to the bottom of the cavity.

[0007] Preferably, the device further comprises a driving device and a cylinder body assembly, one end of the cylinder body assembly is provided with the driving device, the other end of the cylinder body assembly protrudes with the cylinder rod, and the cylinder rod is slidably connected with the end of the cylinder body assembly.

[0008] Preferably, the driving device is a stepper motor or a servo motor, and the stepper motor or the servo motor is connected with the screw through a shaft coupling.

[0009] Preferably, the cylinder body assembly comprises a front cylinder cover, a cylinder body and a rear cylinder cover, the rear cylinder cover is arranged close to the shaft coupling, the rear cylinder cover is rotatably connected with the screw through a bearing, one end of the cylinder body is connected with the front cylinder cover, the other end of the cylinder body is connected with the rear cylinder cover, the cylinder rod passes through the front cylinder cover, and the cylinder rod is slidably connected with the front cylinder cover.

[0010] Preferably, the nut is slidingly connected to the inner wall of the cylinder body.

[0011] Preferably, the front cylinder cover and the cylinder body are integrally formed, and the rear cylinder cover is detachably connected with the cylinder body.

[0012] Preferably, the electric cylinder further comprises a dustproof assembly, the dustproof assembly is detachably connected with the rear cylinder cover to form a closed space, and the driving device, the shaft coupling and part of the lead screw are arranged inside the closed space.

[0013] Preferably, the dustproof assembly comprises a fixed seat plate, a sleeve and a connecting cover, one end of the sleeve is connected with the fixed seat plate, the other end of the sleeve is connected with one end of the connecting cover, and the other end of the connecting cover is detachably connected with the rear cylinder cover.

[0014] Preferably, the lead screw is provided with a T-shaped thread.

[0015] According to the above-mentioned scheme, the electric cylinder has at least the following technical effects:

[0016] The electric cylinder provided by the utility model has the following technical effects: the cavity is arranged in the cylinder rod, the cylinder rod is sleeved outside the lead screw, the guide mandrel is arranged in the lead screw, one end of the guide mandrel is slidingly connected with the lead screw, and the other end of the guide mandrel is connected with the cavity, when the cylinder rod is extended, part of the guide mandrel is pulled out of the lead screw by the cylinder rod to fill the cavity of the cylinder rod, and thus the lateral bearing capacity of the cylinder rod is improved, the structural strength of the cylinder rod is improved, and the service life of the electric cylinder is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0018] Fig. 1 It is a full cross-section schematic view of the cylinder rod of the electric cylinder provided by the embodiments of the present specification and not extended;

[0019] Fig. 2 It is a full cross-section schematic view of the cylinder rod of the electric cylinder provided by the embodiments of the present specification and extended;

[0020] 1, cylinder body, 2, nut, 3, cylinder rod, 4, front cylinder cover, 5, guide mandrel, 6, lead screw, 7, rear cylinder cover, 8, bearing, 9, locking nut, 10, shaft coupling, 11, connecting cover, 12, driving device, 13, fixed seat plate, 14, sleeve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] As shown in Figs. 1-2 The embodiment of the present application provides an electric cylinder, which comprises a lead screw 6, a nut 2, a cylinder rod 3 and a guide mandrel 5. The nut 2 is threadedly connected to the lead screw 6. The cylinder rod 3 has a cavity in the interior. The cylinder rod 3 is sleeved on the exterior of the lead screw 6. One end of the cylinder rod 3 is connected to the nut 2. The nut 2 drives the cylinder rod 3 to reciprocate along the lead screw 6 to realize the extension and retraction of the cylinder rod 3. The interior of the lead screw 6 is provided with a guide cavity. One end of the guide mandrel 5 is slidably connected to the inner wall of the guide cavity. The other end of the guide mandrel 5 is connected to the interior of the cavity. When the cylinder rod 3 is extended under the driving of the nut 2, part of the guide mandrel 5 is pulled out of the guide cavity in the interior of the lead screw 6 by the cylinder rod 3 to fill the cavity of the cylinder rod 3, thereby improving the lateral bearing capacity of the cylinder rod 3 and being beneficial to improving the structural strength of the device and prolonging the service life of the device. The state of the guide mandrel 5 after being pulled out of the guide cavity in the interior of the lead screw 6 is shown in Fig. 2 .

[0023] The guide mandrel 5 is preferably a rod structure, especially a cylindrical rod. Of course, those skilled in the art can also select other shapes of guide mandrels 5 (such as a multi-prism guide mandrel) according to actual needs. One end of the rod structure is slidably connected to the inner wall of the guide cavity. The other end of the rod structure is connected to the bottom of the cavity (i.e. the rightmost end of the cavity in Fig. 1 and Fig. 2 . This arrangement can ensure that the entire cavity is filled with the rod structure in the length direction to improve the overall structural strength of the cylinder rod 3.

[0024] The device further comprises a driving device 12 and a cylinder assembly. One end of the cylinder assembly is provided with the driving device 12. The other end of the cylinder assembly has the cylinder rod 3 extending out. The cylinder rod 3 is slidably connected to the end of the cylinder assembly. The arrangement of the cylinder assembly limits the movement direction of the cylinder rod 3 to keep the cylinder rod 3 in linear reciprocating motion and ensure the accuracy of the movement of the cylinder rod 3.

[0025] The driving device 12 is a stepping motor or a servo motor. The actual needs such as accuracy and cost can be considered for selection. The stepping motor or the servo motor is connected to the lead screw 6 through a shaft coupling 10.

[0026] The cylinder assembly comprises a front cylinder cover 4, a cylinder body 1 and a rear cylinder cover 7, the rear cylinder cover 7 is arranged close to the shaft coupling 10, the rear cylinder cover 7 is rotationally connected with the lead screw 6 through a bearing 8, the bearing 8 is fixed on the lead screw 6 through a locking nut 9, the locking nut 9 is used to limit the axial position of the bearing 8 on the lead screw 6; one end of the cylinder body 1 is connected with the front cylinder cover 4, the other end of the cylinder body 1 is connected with the rear cylinder cover 7, the cylinder rod 3 passes through the front cylinder cover 4, and the cylinder rod 3 is in sliding fit with the front cylinder cover 4, the front cylinder cover 4 is used to limit the movement direction of the cylinder rod 3, so that the cylinder rod 3 keeps linear reciprocating motion.

[0027] The nut 2 is in sliding connection with the inner wall of the cylinder body 1, the cylinder body 1 is used to limit the movement direction of the nut 2, so that the nut 2 keeps linear reciprocating motion, and the accuracy of the movement of the nut 2 is ensured.

[0028] The front cylinder cover 4 and the cylinder body 1 are in one-piece structure, and the rear cylinder cover 7 is detachably connected with the cylinder body 1, so that the assembly between the front cylinder cover 4 and the cylinder body 1 is reduced, and the assembly efficiency of the device is improved.

[0029] The electric cylinder further comprises a dustproof assembly, the dustproof assembly is detachably connected with the rear cylinder cover 7 to form a closed space, the driving device 12, the shaft coupling 10 and part of the lead screw 6 are arranged inside the closed space, so that the use environment of the device is ensured to be clean, dust, impurities and the like are prevented from entering the precision components to wear, thereby being beneficial to further prolonging the service life of the device.

[0030] The dustproof assembly comprises a fixed seat plate 13, a sleeve 14 and a connecting cover 11, one end of the sleeve 14 is connected with the fixed seat plate 13, the other end of the sleeve 14 is connected with one end of the connecting cover 11, and the other end of the connecting cover 11 is detachably connected with the rear cylinder cover 7.

[0031] The lead screw 6 is preferably provided with a T-shaped thread, or a triangular thread or a rectangular thread can be arranged on the lead screw 6 according to the actual needs of the use scene of the electric cylinder.

[0032] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0033] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the present application. In conclusion, the content of the present application should not be understood as the limitation of the present application.

Claims

1. An electric cylinder characterized by, Include: Lead screw, nut, cylinder rod and guide core; The nut is threadedly connected to the lead screw, the cylinder rod has a cavity in the interior, the cylinder rod is sleeved on the outside of the lead screw, and one end of the cylinder rod is connected with the nut, the nut drives the cylinder rod to reciprocate along the lead screw; the lead screw has a guide cavity in the interior, one end of the guide core is in sliding connection with the inner wall of the guide cavity, and the other end of the guide core is connected with the interior of the cavity.

2. The electric cylinder according to claim 1, characterized by The guide core is a rod structure, one end of the rod structure is in sliding connection with the inner wall of the guide cavity, and the other end of the rod structure is connected with the bottom of the cavity.

3. The electric cylinder according to claim 1, characterized by It also includes a driving device and a cylinder assembly, one end of the cylinder assembly is provided with the driving device, the other end of the cylinder assembly protrudes with the cylinder rod, and the cylinder rod is in sliding fit with the end of the cylinder assembly.

4. The electric cylinder according to claim 3, characterized in that, The driving device is a stepper motor or a servo motor; the stepper motor or the servo motor is connected with the lead screw through a shaft coupling.

5. The electric cylinder according to claim 4, characterized in that, The cylinder assembly includes a front cylinder cover, a cylinder body and a rear cylinder cover, the rear cylinder cover is arranged close to the shaft coupling, the rear cylinder cover is in rotary connection with the lead screw through a bearing, one end of the cylinder body is connected with the front cylinder cover, the other end of the cylinder body is connected with the rear cylinder cover, the cylinder rod passes through the front cylinder cover, and the cylinder rod is in sliding fit with the front cylinder cover.

6. The electric cylinder according to claim 5, characterized in that, The nut is in sliding connection with the inner wall of the cylinder body.

7. The electric cylinder according to claim 5, characterized in that, The front cylinder cover and the cylinder body are an integral molding structure, and the rear cylinder cover is detachably connected with the cylinder body.

8. The electric cylinder according to claim 7, characterized in that, The electric cylinder further includes a dustproof assembly, the dustproof assembly is detachably connected with the rear cylinder cover to form a closed space, the driving device, the shaft coupling and part of the lead screw are arranged in the closed space.

9. The electric cylinder according to claim 8, characterized in that, The dustproof assembly includes a fixed seat plate, a sleeve and a connecting cover, one end of the sleeve is connected with the fixed seat plate, the other end of the sleeve is connected with one end of the connecting cover, and the other end of the connecting cover is detachably connected with the rear cylinder cover.

10. The electric cylinder according to claim 1, characterized in that, A T-shaped thread is arranged on the lead screw.

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