Servo electric cylinder

Abstract

The servo electric cylinder comprises a motor, a speed reducer, a cylinder barrel and a pressing shaft, the motor is connected with the speed reducer, the speed reducer is connected with a coupler, the coupler is connected with one end of a lead screw, a pressure sensor is installed between the cylinder barrel and a flange, the coupler is located in the flange, and a first bearing set is installed on the side, facing the flange, of the cylinder barrel. The lead screw is installed at the first bearing set, the lead screw nut is installed on the lead screw, the lead screw nut is installed on the driving block, one end of the pressing shaft is connected with the driving block, the key is installed on one side of the driving block, a key groove is formed in the cylinder barrel, the depth of the key groove is smaller than the thickness of the cylinder barrel, and the key is located at the key groove. According to the utility model, parts mounted at the cylinder barrel are reduced, and the strength of the cylinder barrel is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric technology field, concretely relates to a servo electric cylinder. BACKGROUND

[0002] The servo electric cylinder is a modular product of integrated design of servo motor and ball screw, and converts the rotary motion of the servo motor into linear motion. Since the servo electric cylinder adopts closed-loop servo control, the control precision is high, the servo electric cylinder has the characteristics of low cost and flexible configuration, and is the best alternative product of hydraulic cylinders and air cylinders. The current servo electric cylinder is widely used in the automobile manufacturing industry. At present, the pressure shaft of the servo electric cylinder moves along the cylinder barrel. In order to ensure that the pressure shaft can keep linear movement, a guide hole is arranged at the cylinder barrel, and then a sealing cover is installed outside the guide hole. A plurality of parts need to be installed at the cylinder barrel, which is not economical. The cylinder barrel itself is relatively long. Since the cylinder barrel is provided with the guide hole, the rigidity of the cylinder barrel is reduced, and the cylinder barrel is prone to deformation. SUMMARY

[0003] The utility model provides a kind of servo electric cylinder, change guide hole structure, cancel sealing cover, reduce the part installed at the cylinder barrel, improve the strength of cylinder barrel.

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

[0005] A kind of servo electric cylinder, including motor, speed reducer, cylinder barrel and pressure shaft, motor is connected with speed reducer, speed reducer is connected with shaft coupling, shaft coupling is connected with the one end of screw rod, pressure sensor is installed between cylinder barrel and flange, shaft coupling is located in flange, bearing set one is installed on the side of cylinder barrel towards flange, screw rod is installed at bearing set one, screw nut is installed on screw rod, screw nut is installed on driving block, the one end of pressure shaft is connected with driving block, the side of driving block is installed with key, keyway is arranged in the inside of cylinder barrel, the depth of keyway is less than the thickness of cylinder barrel, key is located at keyway.

[0006] Preferably, guide sleeve is installed on the inner wall of the end of cylinder barrel, and pressure shaft passes through guide sleeve.

[0007] Preferably, the axis of keyway is parallel to the axis of cylinder barrel, the length of keyway is less than the length of cylinder barrel, and one end of keyway is flush with one end of cylinder barrel where pressure sensor is installed.

[0008] Preferably, the outer ring of driving block is provided with wear-resistant band mounting groove, wear-resistant band is installed in wear-resistant band mounting groove, and wear-resistant band is in contact with the inner wall of cylinder barrel.

[0009] Preferably, the outer side of one end of cylinder barrel towards flange is provided with mounting groove, and bearing set one mounting hole is arranged in mounting groove.

[0010] Preferably, the one end of speed reducer is connected with the one end of flange by fastener, and the output shaft of speed reducer is connected with shaft coupling.

[0011] Preferably, the one end of the speed reducer is installed with the driving wheel, the other end of the flange is installed with the bearing, the adapter shaft passes through the bearing, one end of the adapter shaft is connected with the shaft coupling, the other end of the adapter shaft is installed with the driven wheel, the driven wheel is connected with the driving wheel through the synchronous belt, and the flange and the one end of the speed reducer are installed on the base plate.

[0012] Preferably, the base plate is provided with a flange mounting groove, the top of the flange is installed at the flange mounting groove, the top of the flange is provided with a bearing mounting groove, a cover plate is installed at the adapter shaft, the cover plate is installed on the top of the flange, and the outer side of the cover plate is installed with a locking nut.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] The utility model discloses a key groove is set up instead of a guide hole, so that a sealing cover is not needed, assembly parts are reduced, and it is more economical, the cylinder hole is little in deformation, and the consistency and quality are higher. When the pressure shaft is subjected to lateral force, the wear-resistant band can play an auxiliary supporting role, and the bending resistance of the whole machine is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the embodiment schematic view of the utility model.

[0016] Figure 2 It is another visual angle schematic view of another embodiment of the utility model.

[0017] Figure 3 It is the sectional view of the embodiment of the utility model.

[0018] Figure 4 It is the cylinder schematic view of the embodiment of the utility model.

[0019] Figure 5 It is the schematic view of another embodiment of the utility model.

[0020] Figure 6 It is another visual angle schematic view of another embodiment of the utility model.

[0021] Figure 7 It is the sectional view of another embodiment of the utility model. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] As shown in the figure, the utility model discloses a kind of servo electric cylinder, including motor 1, speed reducer 2, cylinder 3 and press shaft 4, motor 1 is connected with speed reducer 2, speed reducer 2 is connected with shaft coupling 5, shaft coupling 5 is connected with one end of screw rod 6, pressure sensor 8 is installed between cylinder 3 and flange 7, shaft coupling 5 is located in flange 7, bearing set one 9 is installed on the side of cylinder 3 towards flange 7, screw rod 6 is installed at bearing set one 9, screw nut 10 is installed on screw rod 6, screw nut 10 is installed on driving block 11, one end of press shaft 4 is connected with driving block 11, the side of driving block 11 is installed with key 12, keyway 31 is equipped in cylinder 3, the depth of keyway 31 is less than the thickness of cylinder 3, and key 12 is located at keyway 31.

[0024] The utility model changes the structure that guiding press shaft 4 moves, i.e. setting keyway 31, instead of opening guiding hole, so that sealing cover is not installed due to the need of closing guiding hole, assembly parts are reduced, and it is more economical.

[0025] The depth of keyway 31 is less than the thickness of cylinder 3, and the deformation of cylinder bore is small, and consistency and quality are higher.

[0026] Key 12 moves along keyway 31, and key 12 limits the movement of driving block 11, so that driving block 11 cannot rotate, and can only move horizontally along keyway 31, to ensure that press shaft 4 can only move horizontally and cannot rotate.

[0027] Speed reducer 2 is finally driven to rotate by shaft coupling 5, screw rod 6 drives screw nut 10 to move horizontally, screw nut 10 drives driving block 11 to move horizontally, driving block 11 drives key 12 and press shaft 4 to move horizontally, to realize the working target of servo electric cylinder.

[0028] In an embodiment of the utility model, guiding sleeve 13 is installed on the inner wall of the end of cylinder 3, and press shaft 4 passes through guiding sleeve 13.

[0029] The function of guiding sleeve 13 is to ensure the stable movement of press shaft 4, play a guiding role, protect cylinder 3, and prevent the end of press shaft from shaking, to ensure accuracy.

[0030] In an embodiment of the utility model, keyway 31 is parallel to the axis of cylinder 3, the length of keyway 31 is less than the length of cylinder 3, and one end of keyway 31 is flush with one end of cylinder 3 where pressure sensor 8 is installed.

[0031] The length of keyway 31 is realized according to processing, i.e. slotting from one end of cylinder 3 where pressure sensor 8 is installed. The end does not reach the other end of cylinder 3, because guiding sleeve 13 needs to be installed.

[0032] As Figure 4 Key 12 is installed on driving block 11 through a plurality of fasteners.

[0033] In this embodiment, there is only one keyway 31.

[0034] In one embodiment of the present invention, the outer ring of the drive block 11 is provided with a wear-resistant belt mounting groove, and a wear-resistant belt 14 is installed in the wear-resistant belt mounting groove, and the wear-resistant belt 14 is in contact with the inner wall of the cylinder 3.

[0035] When the pressure shaft is subjected to lateral force, the wear-resistant belt can provide auxiliary support, thereby improving the overall bending resistance of the machine.

[0036] In one embodiment of this utility model, a mounting groove 32 is provided on the outer side of the cylinder 3 facing the flange 7, and a bearing assembly mounting hole 33 is provided at the mounting groove 32. The mounting groove 32 facilitates the operation of fasteners.

[0037] like Figures 1-3 As shown, the reducer 2 is connected to one end of the flange 7 by fasteners, and the output shaft of the reducer 2 is connected to the coupling 5. The servo cylinder in this embodiment is a direct-drive servo cylinder. That is, the motor 1 drives the output shaft of the reducer 2 to rotate, and the output shaft of the reducer 2 directly drives the coupling 5 to rotate.

[0038] In one embodiment, the bearing assembly 9 includes a bearing housing 91, a bearing 92, and a bearing cover plate 93. The bearing 92 is installed inside the bearing housing 91, the bearing housing 91 is installed at the cylinder 3, and the bearing cover plate 93 is installed on one side of the bearing housing 91.

[0039] The bearing cover plate 93 is used to enclose the bearing 92. Fasteners are installed at the mounting holes 33 of the bearing assembly, and the bearing housing 91 is installed on the fasteners.

[0040] like Figures 4-6 As shown, this embodiment is not a direct-drive servo cylinder, but a reciprocating servo cylinder. The motor 1 and the reducer 2 are located on one side of the cylinder 3 and are not directly connected to the cylinder. In this embodiment, a drive wheel 15 is installed at one end of the reducer 2, and a bearing 16 is installed at the other end of the flange 7. A transition shaft 17 passes through the bearing 16. One end of the transition shaft 17 is connected to the coupling 5, and the other end of the transition shaft 17 is installed with a driven wheel 18. The driven wheel 18 is connected to the drive wheel 15 via a synchronous belt 19. Both the flange 7 and one end of the reducer 2 are mounted on the base plate 20.

[0041] In this embodiment, motor 1 drives reducer 2 to work, and the output end of reducer 2 drives drive wheel 15 to rotate. Through synchronous belt 19, drive driven wheel 18 to rotate. Driven wheel 18 drives adapter shaft 17 to rotate. Adapter shaft 17 drives coupling 5 to rotate. Coupling 5 drives lead screw 6 to rotate. Finally, as in the previous embodiment, the pressure shaft 4 is pushed to move linearly.

[0042] The driven wheel 18 is installed on the adapter shaft 17, the inner ring of the bearing 16 is installed on the adapter shaft 17, and the outer ring of the bearing 16 is installed in the flange 7, which is fixed on the outer ring of the pressure sensor 8, so that the accuracy of the embodiment is higher due to the fact that the synchronous belt is not affected by the tension.

[0043] The bottom plate 20 is provided with a flange installation groove, the top of the flange 7 is installed at the flange installation groove, the top of the flange 7 is provided with a bearing installation groove, the adapter shaft 17 is installed at the cover plate 21, the cover plate 21 is installed at the top of the flange 7, and the outer side of the cover plate 21 is installed with the lock nut 22. The outer side of the bottom plate 20 is further installed with the protective cover 23, and the protective cover 23 is used for protecting the synchronous belt 19, the driven wheel 18 and the driving wheel 15.

[0044] The bottom plate 20 plays a role of installing parts, such as the power combination of the motor 1 and the speed reducer 2, and the flange 7 and the cylinder barrel 3. The protective cover 23 plays a role of dustproof. The overall length of the embodiment is smaller than that of the servo cylinder of the previous embodiment, but the overall width of the embodiment is larger than that of the servo cylinder of the previous embodiment. The servo cylinders disclosed in the two embodiments are selected according to the use environment.

[0045] The above is only an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as the structure of the utility model is not deviated or beyond the scope defined by the claims, which shall belong to the protection scope of the utility model.

Claims

1. A servo cylinder characterized by: The motor is connected with the speed reducer, the speed reducer is connected with the shaft coupling, the shaft coupling is connected with one end of the screw rod, the pressure sensor is installed between the cylinder and the flange, the shaft coupling is located in the flange, the bearing set one is installed on the side of the cylinder facing the flange, the screw rod is installed at the bearing set one, the screw nut is installed on the screw rod, the screw nut is installed on the driving block, one end of the compression shaft is connected with the driving block, the key is installed on one side of the driving block, the key groove is arranged in the cylinder, the depth of the key groove is less than the thickness of the cylinder, and the key is located in the key groove.

2. A servo cylinder according to claim 1, characterized in that: The guiding sleeve is installed on the inner wall of the end of the cylinder, and the compression shaft passes through the guiding sleeve.

3. A servo cylinder according to claim 2, wherein: The key groove is parallel to the axis of the cylinder, the length of the key groove is less than the length of the cylinder, and one end of the key groove is flush with one end of the cylinder where the pressure sensor is installed.

4. The servo cylinder of claim 1 wherein: The outer ring of the driving block is provided with the wear-resistant band mounting groove, the wear-resistant band is installed in the wear-resistant band mounting groove, and the wear-resistant band is in contact with the inner wall of the cylinder.

5. The servo cylinder of claim 1 wherein: The outer side of the end of the cylinder facing the flange is provided with the mounting groove, and the bearing set one mounting hole is arranged in the mounting groove.

6. The servo cylinder of claim 1 wherein: The speed reducer is connected with one end of the flange through the fastener, and the output shaft of the speed reducer is connected with the shaft coupling.

7. The servo cylinder of claim 1 wherein: The driving wheel is installed at one end of the speed reducer, the bearing is installed at the other end of the flange, the adapter shaft passes through the bearing, one end of the adapter shaft is connected with the shaft coupling, the other end of the adapter shaft is installed with the driven wheel, the driven wheel is connected with the driving wheel through the synchronous belt, and one end of the flange and the speed reducer is installed on the bottom plate.

8. A servo cylinder according to claim 7, characterized in that: The flange mounting groove is arranged on the bottom plate, the top of the flange is installed in the flange mounting groove, the top of the flange is provided with the bearing mounting groove, the cover plate is installed at the adapter shaft, the cover plate is installed on the top of the flange, and the lock nut is installed on the outer side of the cover plate.

9. The servo cylinder of claim 5 wherein: The bearing set one comprises a bearing seat, a bearing one and a bearing cover plate, the bearing one is installed in the bearing seat, the bearing seat is installed on the cylinder, and the bearing cover plate is installed on one side of the bearing seat.

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