Planetary lead screw electric cylinder

Abstract

The utility model discloses a planet lead screw electric cylinder which comprises a cylinder body, a transmission assembly and a servo motor, a driving cavity is formed in the cylinder body, a planet lead screw pair and a push rod are arranged in the driving cavity, the transmission assembly comprises a transmission shell, a driving synchronous belt wheel, a driven synchronous belt wheel and a synchronous belt, and the driving synchronous belt wheel, the driven synchronous belt wheel and the synchronous belt are arranged in the transmission cavity of the transmission shell. The planetary screw rod pair is in non-rotatable connection with the push rod through a planetary nut and is connected with the driven synchronous pulley through a screw rod; the driving end of the servo motor is connected with the driving synchronous belt wheel, and the two ends of the synchronous belt are connected with the driving synchronous belt wheel and the driven synchronous belt wheel in an engaged mode respectively. An emergency brake mechanism is arranged in the transmission cavity and comprises a brake wheel and a brake driver; and the speed sensor is arranged in the driving cavity. According to the utility model, the impact force can be gradually reduced during braking to realize buffer braking, so that the braking mechanism is effectively prevented from being damaged and invalid due to rapid braking impact.

Description

Technical Field

[0001] The utility model relates to the technical field of electric cylinders, in particular to a planetary screw electric cylinder. Background Art

[0002] When an existing electric cylinder fails during use, the electric cylinder loses driving force, and the pushed heavy object drives the driving rod to move rapidly in the opposite direction to impact the electric cylinder. Although an emergency braking mechanism is provided in the prior art, since there is no buffering function during the braking process, the emergency braking mechanism is damaged and fails due to the impact force, and lacks reliability.

[0003] Therefore, it is necessary to develop a planetary screw electric cylinder that can gradually reduce the impact force while braking to achieve buffer braking and effectively prevent the braking mechanism from being damaged and failing due to rapid braking impact. Utility Model Content

[0004] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:

[0005] A planetary screw electric cylinder, comprising a cylinder body, a transmission assembly and a servo motor, characterized in that a drive chamber is arranged in the cylinder body, a planetary screw pair and a push rod are arranged in the drive chamber, and the transmission assembly comprises a transmission housing, and a driving synchronous pulley, a driven synchronous pulley and a synchronous belt arranged in the transmission chamber of the transmission housing;

[0006] The planetary screw pair is non-rotatably connected to the push rod through the planetary nut, and is connected to the driven synchronous pulley through the screw, and the rotation of the screw can drive the planetary nut and the push rod to move axially relative to the cylinder body;

[0007] The driving end of the servo motor is connected to the driving synchronous belt pulley, and the two ends of the synchronous belt are respectively meshed and connected with the driving synchronous belt pulley and the driven synchronous belt pulley;

[0008] An emergency brake mechanism for limiting the synchronous belt drive is arranged in the transmission cavity, and the emergency brake mechanism comprises a brake wheel and a brake driver for driving the brake wheel to approach or move away from the synchronous belt;

[0009] It also includes a speed sensor arranged in the driving cavity, the speed sensor is used to monitor the axial movement speed of the planetary nut in real time, and the speed sensor is electrically connected to the emergency braking mechanism.

[0010] Preferably, the emergency brake mechanism is arranged on the outer side of the synchronous belt between the driving synchronous pulley and the driven synchronous pulley.

[0011] Preferably, the transmission housing is provided with slide grooves at both ends of the brake wheel, the brake wheel is slidably connected to the slide grooves via connecting shafts at both ends, and the driving end of the brake driver is connected to the brake wheel of the emergency brake mechanism.

[0012] Preferably, the emergency braking mechanism also includes a connecting frame, and perpendicular connecting parts are provided at both ends of the connecting frame. The connecting parts are only slidably connected to the slide groove, the brake wheel is rotationally connected to the connecting part through a connecting shaft, and the driving end of the brake driver is connected to the connecting frame.

[0013] Preferably, the surface of the brake wheel and the outer surface of the synchronous belt are provided with anti-slip rubber.

[0014] Preferably, the brake driver is arranged on the outside of the transmission housing, and the driving end passes through the transmission housing to the transmission cavity and is connected to the connecting frame.

[0015] Preferably, the transmission cavity is further provided with an installation cavity which is not connected with the transmission cavity, and a battery which is electrically connected with the brake driver and the speed sensor is provided in the installation cavity.

[0016] Preferably, an upper cover plate and a lower cover plate are respectively provided at both ends of the cylinder body, the cylinder body is connected to the transmission housing through the lower cover plate, and the speed sensor is arranged on the inner end surface of the upper cover plate and / or the lower cover plate.

[0017] Preferably, the inner end surfaces of the upper cover plate and the lower cover plate are also provided with proximity sensors.

[0018] Preferably, an inner nut is arranged inside the planetary nut, a rotatable planetary roller is arranged between the planetary nut and the screw rod, and the planetary roller is screwed and connected with the planetary nut and the screw rod thread;

[0019] The planetary nut and the push rod are non-rotatably connected to the cylinder body.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In the utility model, a speed sensor is used to monitor the moving speed of the planetary nut to determine whether the electric cylinder has failed and lost driving force, and the brake driver is controlled to push the brake wheel to gradually approach, squeeze and brake the synchronous belt, so that the impact force can be gradually reduced while braking to achieve buffer braking, effectively avoiding damage and failure of the brake mechanism due to rapid braking impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the utility model;

[0023] Figure 2 It is a top view of the utility model;

[0024] Figure 3 for Figure 2 Schematic diagram of the AA section structure;

[0025] Figure 4 for Figure 2 Schematic diagram of the structure of the middle BB section;

[0026] Figure 5 It is the front view of the utility model;

[0027] Figure 6 for Figure 5 Schematic diagram of the CC cross-section structure;

[0028] Among them: cylinder body 1, transmission assembly 2, servo motor 3, planetary screw pair 4, push rod 5, emergency brake mechanism 6, speed sensor 7, upper cover plate 8, lower cover plate 9, transmission housing 21, active synchronous pulley 22, driven synchronous pulley 23, synchronous belt 24, planetary nut 41, screw 42, planetary roller 43, brake wheel 61, brake driver 62, connecting frame 63, slide groove 211, connecting part 631, drive cavity 10, transmission cavity 20, installation cavity 30, proximity sensor 40, battery 50. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0033] like Figure 1-6As shown, a planetary screw electric cylinder comprises a cylinder body 1, a transmission assembly 2 and a servo motor 3, wherein a driving chamber 10 is arranged in the cylinder body 1, a planetary screw pair 4 and a push rod 5 are arranged in the driving chamber 10, and the transmission assembly 2 comprises a transmission housing 21, and a driving synchronous pulley 22, a driven synchronous pulley 23 and a synchronous belt 24 arranged in a transmission chamber 20 of the transmission housing 21;

[0034] The planetary screw pair 4 is non-rotatably connected to the push rod 5 via the planetary nut 41, and is connected to the driven synchronous pulley 23 via the screw 42. The screw 42 can rotate to drive the planetary nut 41 and the push rod 5 to move axially relative to the cylinder body 1.

[0035] The driving end of the servo motor 3 is connected to the driving synchronous belt pulley 22, and the two ends of the synchronous belt 24 are respectively meshed and connected with the driving synchronous belt pulley 22 and the driven synchronous belt pulley 23;

[0036] An emergency brake mechanism 6 for limiting the transmission of the synchronous belt 24 is disposed in the transmission chamber 20. The emergency brake mechanism 6 includes a brake wheel 61 and a brake driver 62 for driving the brake wheel 61 to move closer to or away from the synchronous belt 24.

[0037] It also includes a speed sensor 7 disposed in the driving cavity 10 . The speed sensor 7 is used to monitor the axial movement speed of the planetary nut 41 in real time. The speed sensor 7 is electrically connected to the emergency brake mechanism 6 .

[0038] In this embodiment, the cylinder body 1 and the servo motor 3 are connected to the transmission housing 21; when the electric cylinder fails during use, the electric cylinder loses driving force, and the push rod 5 and the planetary nut 41 move rapidly in the opposite direction under the action of pushing the heavy object. At this time, the speed sensor 7 detects that the moving speed value of the planetary nut 41 exceeds the moving speed value of normal operation, and drives the brake driver 62 to push the brake wheel 61 to approach and gradually squeeze the synchronous belt 24. Compared with the rapid braking structure of the prior art, in the process of the synchronous belt 24 gradually approaching and squeezing the synchronous belt 24, the impact force is reduced by increasing the friction force, so that the electric cylinder can achieve effective buffer braking, effectively avoiding the brake mechanism from being damaged and failing due to rapid braking impact, and greatly improving the reliability of use.

[0039] Further, such as Figure 2 , 6 As shown, in order to improve the effect and efficiency of emergency braking, the emergency braking mechanism 6 is arranged on the outside of the synchronous belt 24 between the driving synchronous pulley 22 and the driven synchronous pulley 23 .

[0040] Further, such as Figure 3 , 4As shown in FIG. 6 , in order to ensure that the brake wheel 61 can smoothly approach or move away from the synchronous belt 24 and to enhance the stability and reliability of the brake wheel 61 when squeezing the synchronous belt 24, the transmission housing 21 is provided with slide grooves 211 at both ends of the brake wheel 61, and the brake wheel 61 is slidably connected to the slide grooves 211 through connecting shafts at both ends, and the driving end of the brake driver 62 is connected to the brake wheel 61 of the emergency brake mechanism 6.

[0041] Further, such as Figure 3 , 4 As shown in FIG. 6 , in order to ensure that the brake wheel 61 can rotate to squeeze the brake synchronous belt 24, reduce the friction with the synchronous belt 24 during the braking process, and extend the service life of the synchronous belt 24, the emergency brake mechanism 6 also includes a connecting frame 63, and the two ends of the connecting frame 63 are provided with vertical connecting parts 631, and the connecting part 631 is only slidably connected to the slide groove 211. The brake wheel 61 is rotatably connected to the connecting part 631 through a connecting shaft, and the driving end of the brake driver 62 is connected to the connecting frame 63; during braking, the brake driver 62 pushes the connecting frame 63 along the slide groove 211 to gradually approach, squeeze and brake the synchronous belt 24. During the process, the brake wheel 61 rotates with the transmission of the synchronous belt 24.

[0042] Further, such as Figure 3 , 4 As shown in Figure 6, when the brake wheel 61 just contacts the synchronous belt 24, since the transmission speed of the synchronous belt 24 is higher than the rotation speed of the brake wheel 61, sliding friction is generated between the brake wheel 61 and the synchronous belt 24. Therefore, in order to reduce the sliding friction between the brake wheel 61 and the synchronous belt 24 and improve the rotation effect, the surface of the brake wheel 61 and the outer surface of the synchronous belt 24 are provided with anti-slip rubber (not marked in the figure).

[0043] Further, such as Figure 2 As shown, in order to reduce the space occupied by the transmission cavity 20 and facilitate the maintenance and replacement of the brake driver 62, the brake driver 62 is arranged on the outside of the transmission housing 21, and the driving end passes through the transmission housing 21 to the transmission cavity 20 and is connected to the connecting frame 63.

[0044] Further, such as Figure 6 As shown, the electric cylinder will also lose driving force when the power is off. Therefore, in order to ensure that the emergency brake mechanism 6 works in the event of a power outage and improve braking reliability, an installation chamber 30 that is not connected to the transmission chamber 20 is also provided in the transmission chamber 20, and a battery 50 electrically connected to the brake driver 62 and the speed sensor 7 is provided in the installation chamber 30.

[0045] Further, such as Figure 3As shown, an upper cover plate 8 and a lower cover plate 9 are respectively provided at both ends of the cylinder body 1 , the cylinder body 1 is connected to the transmission housing 21 through the lower cover plate 9 , and the speed sensor 7 is arranged on the inner end surface of the upper cover plate 8 and / or the lower cover plate 9 .

[0046] In this embodiment, the speed sensor 7 is located in the gap between the cylinder body 1 and the planetary nut 41 to monitor the axial movement of the planetary nut 41 in real time.

[0047] Further, such as Figure 3 As shown, in order to prevent the planetary nut 41 from overtravel and protect the electric cylinder, the inner end faces of the upper cover plate 8 and the lower cover plate 9 are also provided with proximity sensors 40; when working, when the proximity sensor 40 located on the upper cover plate 8 or the lower cover plate 9 detects that the planetary nut 41 reaches the set position, the servo motor 3 is controlled to stop or reverse drive.

[0048] Further, such as Figure 3 As shown, an inner nut is provided inside the planetary nut 41, a rotatable planetary roller 43 is provided between the planetary nut 41 and the screw rod 42, and the planetary roller 43 is threadedly connected with the planetary nut 41 and the screw rod 42;

[0049] The planetary nut 41 and the push rod 5 are non-rotatably connected to the cylinder body 1 .

[0050] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of the utility model patent.

Claims

1. A planetary screw electric cylinder, comprising a cylinder body, a transmission assembly and a servo motor, characterized in that: The cylinder body is provided with a driving chamber, the driving chamber is provided with a planetary screw pair and a push rod, the transmission assembly comprises a transmission housing, and a driving synchronous pulley, a driven synchronous pulley and a synchronous belt arranged in the transmission chamber of the transmission housing; The planetary screw pair is non-rotatably connected to the push rod through the planetary nut, and is connected to the driven synchronous pulley through the screw, and the rotation of the screw can drive the planetary nut and the push rod to move axially relative to the cylinder body; The driving end of the servo motor is connected to the driving synchronous belt pulley, and the two ends of the synchronous belt are respectively meshed and connected with the driving synchronous belt pulley and the driven synchronous belt pulley; An emergency brake mechanism for limiting the synchronous belt drive is arranged in the transmission cavity, and the emergency brake mechanism comprises a brake wheel and a brake driver for driving the brake wheel to approach or move away from the synchronous belt; It also includes a speed sensor arranged in the driving cavity, the speed sensor is used to monitor the axial movement speed of the planetary nut in real time, and the speed sensor is electrically connected to the emergency braking mechanism.

2. The planetary screw electric cylinder according to claim 1, characterized in that: The emergency brake mechanism is arranged on the outer side of the synchronous belt between the driving synchronous belt pulley and the driven synchronous belt pulley.

3. The planetary screw electric cylinder according to claim 1, characterized in that: The transmission housing is provided with slide grooves at both ends of the brake wheel, the brake wheel is slidably connected to the slide grooves through connecting shafts at both ends, and the driving end of the brake driver is connected to the brake wheel of the emergency brake mechanism.

4. The planetary screw electric cylinder according to claim 3, characterized in that: The emergency brake mechanism also includes a connecting frame, and perpendicular connecting parts are arranged at both ends of the connecting frame. The connecting parts are only slidably connected to the slide groove, the brake wheel is rotationally connected to the connecting part through a connecting shaft, and the driving end of the brake driver is connected to the connecting frame.

5. A planetary screw electric cylinder according to claim 1, 3 or 4, characterized in that: The surface of the brake wheel and the outer surface of the synchronous belt are provided with anti-skid rubber.

6. The planetary screw electric cylinder according to claim 4, characterized in that: The brake driver is arranged on the outside of the transmission housing, and the driving end penetrates the transmission housing to the transmission cavity and is connected to the connecting frame.

7. The planetary screw electric cylinder according to claim 1, characterized in that: The transmission cavity is also provided with an installation cavity which is not communicated with the transmission cavity, and the installation cavity is provided with a storage battery which is electrically connected with the brake driver and the speed sensor.

8. The planetary screw electric cylinder according to claim 1, characterized in that: An upper cover plate and a lower cover plate are respectively arranged at both ends of the cylinder body, the cylinder body is connected to the transmission housing through the lower cover plate, and the speed sensor is arranged on the inner end surface of the upper cover plate and / or the lower cover plate.

9. The planetary screw electric cylinder according to claim 8, characterized in that: The inner end surfaces of the upper cover plate and the lower cover plate are also provided with proximity sensors.

10. The planetary screw electric cylinder according to claim 1, characterized in that: An inner nut is arranged inside the planetary nut, a rotatable planetary roller is arranged between the planetary nut and the screw rod, and the planetary roller is screwed and connected with the planetary nut and the screw rod thread; The planetary nut and the push rod are non-rotatably connected to the cylinder body.

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