Electric cylinder structure

Abstract

The utility model discloses an electric cylinder structure which comprises a driving motor composed of a stator assembly and a rotor assembly and further comprises an installation base, and the stator assembly is fixedly installed on the installation base. The rotor assembly is arranged on an inner ring of the stator assembly, the rear end of a rotor shaft of the rotor assembly is rotatably mounted on the mounting base, and the front end of the rotor shaft of the rotor assembly is rotatably mounted on the front end cover; a lead screw or a lead screw nut is fixedly installed on the front section of the rotor shaft, and the lead screw or the lead screw nut is driven by the rotor shaft to rotate. The driving motor is arranged depending on the mounting base, so that the driving motor and the mounting base form an integrated structure, the overall structure is optimized, the overall size of the electric cylinder is effectively reduced, it can be guaranteed that the rotor shaft is kept in a static state when power is suddenly cut off or a sudden failure occurs, and the service life of the electric cylinder is prolonged. And displacement of the electric cylinder shafting in a non-working state caused by external vibration is prevented, and the overall stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of electric cylinder structure, in particular to a kind of integrated electric cylinder structure. BACKGROUND

[0002] Electric cylinder is a kind of electric power driving device that the rotary motion of motor is converted into the linear reciprocating motion of push rod. Electric cylinder can realize accurate speed control, accurate position control and accurate thrust control, and is a new revolutionary product for realizing high-precision linear motion.

[0003] In prior art, the structure of electric cylinder is mostly to separately set driving motor and screw rod. For example, driving motor is set at the rear end of screw rod, and the motor shaft of driving motor is connected with screw rod through coupling to drive; or driving motor is set at the side of screw rod, and the motor shaft is connected with screw rod through synchronous belt to drive.

[0004] As described above, as driving motor and screw rod are separately set, no matter what arrangement is adopted, it will occupy a large amount of internal space of electric cylinder, thereby restricting the structure size of electric cylinder and increasing the volume of electric cylinder. Moreover, the driving position of electric cylinder is adjusted and controlled by power on / off, and in the case of power off of electric cylinder, the screw rod connected with the motor shaft of electric cylinder may still move and cause position change under the influence of installation and operation environment of electric cylinder, which will affect the accurate control of driving position. SUMMARY

[0005] The utility model provides a kind of electric cylinder structure in view of the drawbacks of prior art.

[0006] The electric cylinder structure, comprising driving motor consisting of stator assembly and rotor assembly, further comprising mounting base, the stator assembly is fixedly installed on the mounting base;

[0007] The rotor assembly is placed in the inner ring of the stator assembly, and the rear end of the rotor shaft of the rotor assembly is rotatably installed on the mounting base, and the front end of the rotor shaft of the rotor assembly is rotatably installed on the front end cover;

[0008] Screw rod or screw nut is fixedly installed on the front section of the rotor shaft, and the screw rod or the screw nut is driven to rotate by the rotor shaft.

[0009] In the electric cylinder structure, brake permanent magnet and brake electromagnetic coil are arranged in the mounting base.

[0010] Further comprising brake armature, the brake armature is connected with the rear end of the rotor shaft, and has clearance moving along the axial direction of the rotor shaft.

[0011] When the brake electromagnetic coil loses power, the brake armature is attracted by the brake permanent magnet and moves axially to be adsorbed on the brake permanent magnet, so that the rotor shaft is kept in the current position.

[0012] When the brake electromagnetic coil is powered on, the brake armature is separated from the brake permanent magnet and rotates synchronously with the rotor shaft.

[0013] The electric cylinder structure has the machine shell arranged on the outer circle of the stator assembly, and the stator assembly is fixedly installed on the mounting base through the machine shell.

[0014] The electric cylinder structure has the machine shell arranged on the outer circle of the stator assembly, and the stator assembly is fixedly installed on the mounting base through the machine shell.

[0015] The electric cylinder structure has the machine shell arranged on the outer circle of the stator assembly, and the stator assembly is fixedly installed on the mounting base through the machine shell.

[0016] The front end of the rotor shaft is connected with the front end cover through an angular contact bearing.

[0017] The first installation stepped platform is connected with the first fixed stepped platform opened in the front end surface of the mounting base through a thrust bearing.

[0018] The second installation stepped platform is connected with the second fixed stepped platform opened in the middle part of the mounting base through a deep groove ball bearing.

[0019] The electric cylinder structure has the machine shell arranged on the outer circle of the stator assembly, and the stator assembly is fixedly installed on the mounting base through the machine shell.

[0020] Alternatively, the lead screw is fixedly installed on the inner recess stepped platform opened in the front end of the rotor shaft.

[0021] The electric cylinder structure further comprises an encoder fixedly installed on the mounting base.

[0022] The electric cylinder structure has the machine shell arranged on the outer circle of the stator assembly, and the stator assembly is fixedly installed on the mounting base through the machine shell. Furthermore, by arranging the brake armature, the rotor shaft of the electric cylinder can be kept in a stationary state when suddenly losing power or suddenly failing, the safety of the electric cylinder is improved, the shafting of the electric cylinder in a non-working state caused by external vibration is prevented from moving, and the stability of the overall precision of the electric cylinder is improved. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the electric cylinder structure described in this utility model;

[0024] Figure 2 This is another schematic diagram of the electric cylinder structure described in this utility model;

[0025] Figure 3 This is another schematic diagram of the electric cylinder structure described in this utility model;

[0026] Figure 4 This is another schematic diagram of the electric cylinder structure described in this utility model;

[0027] Figure 5 This is another schematic diagram of the electric cylinder structure described in this utility model. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0029] like Figure 1The utility model discloses electric cylinder structure, including the drive motor that is constituted by stator subassembly 1 and rotor subassembly 2, still including installation base 40, stator subassembly 1 is fixedly installed on installation base 40, installation base 40 has installation flange 41, and can be fixedly installed on the fixed device of use field through this installation flange 41. Rotor subassembly 2 is placed in the inner ring of stator subassembly 1, and the rear end 201 of rotor shaft 20 of rotor subassembly 2 is rotatablely installed on installation base 40 through bearing etc. subassembly, similarly, the front end 202 of this rotor shaft 20 is installed on the front end cover 3 of drive motor through bearing etc. subassembly. The lead screw 10 or the lead screw nut 11 is fixedly installed on the front end of rotor shaft 20, and the lead screw 10 or the lead screw nut 11 can be driven to rotate by rotor shaft 20. That is, the lead screw 10 or the lead screw nut 11 can be fixedly installed on the front section of rotor shaft 20 in alternative mode, namely, if the lead screw 10 is fixedly installed on the front section of rotor shaft 20, then the lead screw nut 11 installed on the lead screw 10 is installed on the driven member, and the lead screw nut 11 can be driven to make linear reciprocating motion together with the driven member by rotor shaft 20 driving the lead screw 10 to rotate. Similarly, the lead screw nut 11 can be fixedly installed on the front section of rotor shaft 20, and the lead screw 10 is installed on the driven member, and the lead screw 10 can be driven to make linear reciprocating motion together with the driven member by rotor shaft 20 driving the lead screw nut 11 to rotate. As above, the utility model discloses electric cylinder structure, and the lead screw 10 or the lead screw nut 11 is installed in drive motor, which can effectively reduce the overall volume of electric cylinder, make the layout of each component more reasonable and compact, and installation base 40 is the component part of drive motor, so that drive motor forms integral structure, the overall structure is optimized, and mechanical strength is obviously improved.

[0030] Further, also can be like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5As shown, a braking permanent magnet and a braking electromagnetic coil (not shown) are disposed within the mounting base 40. A braking armature 42 may also be disposed therein, and the braking armature 42 is connected to the rear end of the rotor shaft 20 (specifically, a connecting disk 43 may be fixedly connected to the rear end 201 of the rotor shaft 20, and the braking armature 42 and the connecting disk 43 may be connected by a spring piece 423). The spring piece 423 causes the braking armature 42 to rotate synchronously with the connecting disk 43 and the rotor shaft 20 in the circumferential direction, while having a certain movement clearance in the axial direction of the rotor shaft 20. Thus, when the braking electromagnetic coil is de-energized, the braking armature 42 is attracted by the braking permanent magnet and moves axially and adheres to the braking permanent magnet (i.e., the mounting base 40), thereby keeping the rotor shaft 20 in its current position without rotating or shifting, which is beneficial for precise positioning. When the braking electromagnetic coil is energized, the magnetic field force generated by the braking electromagnetic coil cancels the magnetic force of the braking permanent magnet, allowing the braking armature 42 to detach from the braking permanent magnet (i.e., the mounting base 40) and rotate synchronously with the rotor shaft 20 to ensure the linear motion drive function of the electric cylinder.

[0031] like Figure 2 As shown, the electric cylinder structure of this utility model also includes a front end cover 3, which is fixedly installed on the front end of the mounting base 40, and the front end cover 3 and the mounting base 40 form an inner space for setting the stator assembly 1. That is, as... Figure 1 As shown, the mounting base 40 has an axially extending wall 401, a platform 402 extending towards the center, and a wall 403 extending axially from the end of the platform 402 towards the rear end. The wall 401, the platform 402, and the front end cover 3 form a concave inner space, and the stator assembly 1 is disposed within this concave inner space. This structure is more refined and can effectively improve the overall strength of the electric cylinder and increase production efficiency.

[0032] In practical applications, it can also be like... Figure 3 As shown, a housing 8 is provided on the outer ring of the stator assembly 1. The stator assembly 1 is fixedly mounted to the mounting base 40 via the housing 8, and the stator assembly 1 is located on the outer ring of the rotor assembly 2. As described above, the front end cover 3 is fixedly mounted to the front end of the housing 8. The front end cover 3, the housing 8, and the mounting base 40 (specifically, a platform 402 extending from the center of the mounting base 40) form an inner space for mounting the stator assembly 1.

[0033] In the electric cylinder structure of this utility model, a first mounting step 21 and a second mounting step 22 are sequentially arranged on the outer wall of the middle part of the rotor shaft 20 from front to back. The front end 202 of the rotor shaft 20 is connected to the front end cover 3 by an angular contact bearing 92; the first mounting step 21 is connected to the first fixed step 401 opened on the front end face of the mounting base 40 by a thrust bearing 96; and the second mounting step 22 is connected to the second fixed step 402 opened in the middle part of the mounting base 40 by a deep groove ball bearing 97.

[0034] In the electric cylinder structure described in this utility model, the lead screw 10 can be driven to rotate, thereby causing the lead screw nut 11 to perform linear reciprocating motion; conversely, the lead screw 10 can be driven to rotate, thereby causing the lead screw nut 11 to perform linear reciprocating motion. Therefore, as follows... Figure 5 As shown, the mounting flange 112 of the lead screw nut 11 can be fixed by screwing the bolt 111 into the mounting hole 93 on the front end face of the rotor shaft 20, thereby driving the lead screw nut 11 to rotate through the rotor shaft 20 and driving the lead screw to perform linear reciprocating motion. Alternatively, as Figure 4 As shown, the mounting flange 101 of the lead screw 10 is fixed by screwing the bolt 102 into the mounting hole 94 of the concave stepped platform 203 at the front end of the rotor shaft 20, and then the rotor shaft 20 drives the lead screw 10 to rotate, thereby driving the lead screw nut 11 to perform linear reciprocating motion.

[0035] In the electric cylinder structure described in this utility model, an encoder 7 is also provided to achieve precise position control of the drive motor. The encoder 7 is fixedly installed relative to the mounting base 40. That is, as... Figure 1 As shown, the encoder 7 can be fixedly mounted on the mounting base 40, or as... Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the encoder 7 is fixedly mounted on the cover 5 at the rear end of the mounting base 40 (the cover 5 is fixed relative to the mounting base 40, and also encloses the mounting base 40, brake armature 42, and connecting plate 43). Furthermore, an encoder cover 6 can also be provided to enclose the encoder 7.

[0036] In the electric cylinder structure described in this utility model, the drive motor is arranged based on the mounting base 40, that is, the mounting base 40 is fixedly installed on the fixing device, and the drive motor is set on the mounting base 40 as a support, so that the drive motor and the mounting base 40 form an integrated structure, optimizing the overall structure, making the layout of each component more reasonable and compact, and effectively reducing the overall volume of the electric cylinder. Furthermore, by setting the brake armature 42, the rotor shaft of the electric cylinder can be kept stationary in the event of a sudden power outage or sudden malfunction, improving the safety of the electric cylinder, preventing the shaft system of the electric cylinder from moving due to external vibration in the non-working state, and improving the overall accuracy and stability of the electric cylinder.

[0037] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An electric cylinder structure, comprising a drive motor consisting of a stator assembly and a rotor assembly, characterized in that, It also includes a mounting base, on which the stator assembly is fixedly mounted; The rotor assembly is placed in the inner ring of the stator assembly, and the rear end of the rotor shaft of the rotor assembly is rotatably mounted on the mounting base, and the front end of the rotor shaft of the rotor assembly is rotatably mounted on the front end cover. A lead screw or lead screw nut is fixedly installed at the front section of the rotor shaft, and the lead screw or lead screw nut is driven to rotate by the rotor shaft.

2. The electric cylinder structure as described in claim 1, characterized in that, The mounting base is equipped with a braking permanent magnet and a braking electromagnetic coil. It also includes a brake armature, which is connected to the rear end of the rotor shaft and has a clearance that allows it to move axially along the rotor shaft; When the braking electromagnetic coil is de-energized, the braking armature is attracted by the braking permanent magnet and moves axially and is attracted to the braking permanent magnet, so that the rotor shaft is kept in the current position; When the braking electromagnetic coil is energized, the braking armature disengages from the braking permanent magnet and rotates synchronously with the rotor shaft.

3. The electric cylinder structure as described in claim 1 or 2, characterized in that, A housing is provided on the outer ring of the stator assembly, and the stator assembly is fixedly mounted to the mounting base through the housing.

4. The electric cylinder structure as described in claim 3, characterized in that, The front cover is fixedly installed at the front end of the housing, and the front cover, the housing, and the mounting base form an inner space for setting the stator assembly.

5. The electric cylinder structure as described in claim 4, characterized in that, The outer wall of the middle part of the rotor shaft is provided with a first mounting platform and a second mounting platform from front to back. The front end of the rotor shaft is connected to the front end cover by an angular contact bearing. The first mounting step platform and the first fixed step platform opened on the front end face of the mounting base are connected by a thrust bearing. The second mounting step is connected to the second fixed step in the middle of the mounting base by a deep groove ball bearing.

6. The electric cylinder structure as described in claim 1 or 2, characterized in that, The front end cover is fixedly installed on the front end of the mounting base, and the front end cover and the mounting base form an inner space for setting the stator assembly.

7. The electric cylinder structure as described in claim 6, characterized in that, The outer wall of the middle part of the rotor shaft is provided with a first mounting platform and a second mounting platform from front to back. The front end of the rotor shaft is connected to the front end cover by an angular contact bearing. The first mounting step platform and the first fixed step platform opened on the front end face of the mounting base are connected by a thrust bearing. The second mounting step is connected to the second fixed step in the middle of the mounting base by a deep groove ball bearing.

8. The electric cylinder structure as described in claim 1 or 2, characterized in that, The lead screw nut is fixedly installed on the front end face of the rotor shaft; Alternatively, the lead screw is fixedly installed on a recessed stepped platform at the front end of the rotor shaft.

9. The electric cylinder structure as described in claim 1 or 2, characterized in that, It also includes an encoder that is fixedly mounted on the mounting base.

10. The electric cylinder structure as described in claim 9, characterized in that, It also includes an encoder cover for enclosing the encoder.

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