Controllable servo electric cylinder

Abstract

The utility model discloses a controllable servo electric cylinder which comprises a cylinder body, a lead screw pair and a servo motor, the lead screw pair is arranged in a driving cavity of the cylinder body, the lead screw pair is in transmission connection with the driving end of the servo motor, and the lead screw pair comprises a driving rod capable of stretching out and drawing back in the axial direction relative to the cylinder body; a measuring device and a buffer braking device are arranged on the outer side of the cylinder body, the buffer braking device comprises a buffer assembly connected with the cylinder body and a braking mechanism connected with the buffer assembly, and the braking mechanism is used for limiting the pushed or pulled driving rod to axially and reversely move relative to the cylinder body during power failure; the buffering assembly is used for absorbing part of impact force borne by the braking mechanism. According to the utility model, the push-out length of the driving rod can be monitored and corrected visually, and the driving precision is improved; and meanwhile, during power failure, the pushing or pulling driving rod can be rapidly buffered and braked, the impact force of a hand part is absorbed during braking, the situation that a braking mechanism is damaged and fails due to rapid braking impact is effectively avoided, and the device is suitable for the high-load working condition of pushing and pulling heavy objects.

Description

Technical Field

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

[0002] The electric cylinder of the prior art can stably control the extension and retraction of the driving rod, but the extension and retraction length of the driving rod cannot be intuitively seen, which is not convenient for monitoring and correcting the extension length of the driving rod, thereby affecting the control accuracy;

[0003] In addition, although the electric cylinder is provided with an emergency motorized mechanism which can prevent the electric cylinder from losing power and the heavy object being pushed from driving the driving rod to move rapidly in the opposite direction and impact the electric cylinder body, its structure has no buffering function during the braking process, causing the emergency braking mechanism to be damaged and fail due to the impact force, lacking reliability, and only being able to perform emergency braking in a single direction, making it unsuitable for high-load conditions of pushing and pulling heavy objects.

[0004] Therefore, it is necessary to develop a controllable servo electric cylinder that can intuitively monitor and correct the push-out length of the drive rod to improve the driving accuracy; at the same time, when the power is off, it can quickly buffer and brake the pushed or pulled drive rod, and absorb the impact force of the hand part while braking, effectively avoiding damage and failure of the braking mechanism due to rapid braking impact, and is suitable for high-load conditions of pushing and pulling heavy objects. Utility Model Content

[0005] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:

[0006] A controllable servo electric cylinder, comprising a cylinder body, a lead screw pair and a servo motor, characterized in that the lead screw pair is arranged in a driving cavity of the cylinder body, the lead screw pair is drivingly connected to a driving end of the servo motor, and the lead screw pair comprises a driving rod which can be axially extended and retracted relative to the cylinder body;

[0007] A measuring device connected to the drive rod is provided on the outside of the cylinder body, and the measuring device is used to monitor and correct the push-out length of the drive rod. A buffer brake device is provided on the side of the cylinder body located at the measuring device, and the buffer brake device includes a buffer assembly connected to the cylinder body, and a brake mechanism connected to the buffer assembly. The brake mechanism is used to limit the axial reverse movement of the pushed or pulled drive rod relative to the cylinder body when power is off, and the buffer assembly is used to absorb part of the impact force exerted on the brake mechanism.

[0008] Preferably, the measuring device comprises a first sliding rod, a connecting rod and a first connecting seat extending axially from one end of the cylinder body to the other end;

[0009] The two ends of the first sliding rod are respectively connected to the two ends of the first connecting seat, and the connecting rod is in a right angle shape, one end of which is connected to the driving rod, and the other end is slidably connected to the first sliding rod;

[0010] The braking mechanism prevents the driving rod from moving in the reverse direction by limiting the sliding movement of the connecting rod relative to the first sliding rod.

[0011] Preferably, a scale is provided on the surface of the first connecting seat, and an indicating needle for indicating the scale is provided at one end of the connecting rod that is slidably connected to the first sliding rod.

[0012] Preferably, a left ratchet bar with teeth opening facing downward is provided on the left side of the connecting rod, and a right ratchet bar with teeth opening facing downward is provided on the right side;

[0013] The brake mechanism comprises a first brake assembly and a second brake assembly connected to the outer side of the cylinder body through a buffer assembly, the first brake assembly is located on one side of the left ratchet bar, the second brake assembly is located on one side of the right ratchet bar, the second brake assembly comprises a second pawl engaged with the right ratchet bar for preventing the connecting rod from moving downward, and a second connecting block connected to the buffer assembly;

[0014] The second pawl can be rotatable relative to the right ratchet bar and is connected to the second connecting block. The second connecting block is located above the second pawl and is provided with a second electromagnet. The second electromagnet moves the second pawl away from the right ratchet bar when the second electromagnet is energized, and the second pawl is engaged with the right ratchet bar when the first electromagnet is de-energized.

[0015] Preferably, the first brake assembly comprises a first pawl engaged with the left ratchet bar for preventing the connecting rod from moving upward, and a first connecting block connected to the buffer assembly;

[0016] The first pawl can be rotatable relative to the left ratchet bar and is connected to the first connecting block. The first connecting block is located below the first pawl and is provided with a first electromagnet. A torsion spring is provided between the first connecting block and the first pawl. When the first electromagnet is energized, the first pawl moves away from the left ratchet bar. When the first electromagnet is de-energized, the torsion spring causes the first pawl to rotate and engage with the left ratchet bar.

[0017] Preferably, the buffer assembly includes a second connecting seat connected to the cylinder body, and a second sliding rod having two ends respectively connected to two ends of the second connecting seat, and the second connecting block and the first connecting block of the first brake assembly are respectively slidably sleeved with the second sliding rod;

[0018] The buffer assembly also includes a buffer member slidably sleeved with the second sliding rod, the first connecting block is located below the buffer member, and the second connecting block is located above the buffer member.

[0019] Preferably, the buffer is rubber or a spring or a combination thereof.

[0020] Preferably, there are more than two second sliding bars, and the buffer members are arranged in one-to-one correspondence with the second sliding bars.

[0021] Preferably, it also includes a transmission assembly, and the screw pair is transmission-connected to the driving end of the servo motor via the transmission assembly.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The utility model can intuitively monitor and correct the push-out length of the driving rod, thereby improving the driving accuracy. At the same time, when the power is off, the pushed or pulled driving rod can be quickly buffered and braked, and the impact force of the hand part can be absorbed while braking, effectively avoiding damage and failure of the braking mechanism due to rapid braking impact, and is suitable for high-load conditions of pushing and pulling heavy objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0025] Figure 2 It is a left view of the utility model;

[0026] Figure 3 for Figure 2 A partial enlarged schematic diagram in the middle;

[0027] Figure 4 It is a rear view of the utility model;

[0028] Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0029] Among them: cylinder body 1, driving rod 2, servo motor 3, measuring device 4, buffer assembly 5, brake mechanism 6, transmission assembly 7, first slide bar 41, connecting rod 42, first connecting seat 43, indicator needle 44, second connecting seat 51, second slide bar 52, buffer 53, first brake assembly 61, second brake assembly 62, left ratchet bar 421, right ratchet bar 422, first pawl 611, first connecting block 612, first electromagnet 613, torsion spring 614, second pawl 621, second connecting block 622, second electromagnet 623. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0034] like Figure 1-5 As shown, a controllable servo electric cylinder comprises a cylinder body 1, a screw pair and a servo motor 3, wherein the screw pair is arranged in a driving cavity of the cylinder body 1, the screw pair is drivingly connected to a driving end of the servo motor 3, and the screw pair comprises a driving rod 2 which can be axially extended and retracted relative to the cylinder body 1;

[0035] The outer side of the cylinder body 1 is provided with a measuring device 4 connected to the driving rod 2, and the measuring device 4 is used to monitor and correct the push-out length of the driving rod 2. The cylinder body 1 is provided with a buffer brake device on one side of the measuring device 4, and the buffer brake device includes a buffer assembly 5 connected to the cylinder body 1, and a brake mechanism 6 connected to the buffer assembly 5, and the brake mechanism 6 is used to limit the axial reverse movement of the driving rod 2 pushed or pulled relative to the cylinder body 1 when the power is off, and the buffer assembly 5 is used to absorb part of the impact force received by the brake mechanism 6. In this embodiment, the electric cylinder drives the lead screw pair through the servo motor 3 to make the driving rod 2 axially extend and retract relative to the cylinder body 1. Although the servo motor 3 can accurately control the extension and retraction of the driving rod 2, that is, it is not possible to intuitively know whether the length value of the driving rod 2 extending or retracting when the servo motor 3 is driven at a set speed or time is the set length value. Therefore, the measuring device 4 is arranged on the outer side of the cylinder body 1 to intuitively know whether the length value of the extension and retraction of the driving rod 2 is the same as the set length value, so that the push-out length of the driving rod 2 can be intuitively monitored and corrected quickly and effectively, thereby improving the driving accuracy.

[0036] In this embodiment, a buffer brake device consisting of a buffer assembly 5 and a brake mechanism 6 is arranged on the outside of the cylinder body 1, so that the pushed or pulled driving rod 2 can be buffered and braked rapidly when the power is off, and the impact force of the hand part can be absorbed while braking, effectively preventing the brake mechanism 6 from being damaged and failing due to rapid braking impact, and is suitable for high-load conditions of pushing and pulling heavy objects.

[0037] Further, such as Figure 2 , 3 As shown, in order to enable the brake mechanism 6 to brake the driving rod 2 through the measuring device 4, the measuring device 4 includes a first sliding rod 41, a connecting rod 42, and a first connecting seat 43 extending axially from one end of the cylinder body 1 to the other end;

[0038] The two ends of the first slide bar 41 are respectively connected to the two ends of the first connecting seat 43, and the connecting rod 42 is in a right angle shape, one end of which is connected to the driving rod 2, and the other end is slidably connected to the first slide bar 41;

[0039] The braking mechanism 6 prevents the driving rod 2 from moving in the reverse direction by limiting the sliding of the connecting rod 42 relative to the first sliding rod 41 .

[0040] Further, such as Figure 2 , 3 As shown, in order to realize intuitive and effective observation of the extension length of the driving rod 2 and facilitate rapid monitoring and correction of the extension length of the driving rod 2, the surface of the first connecting seat 43 is provided with a scale (not marked in the figure), and the end of the connecting rod 42 that is slidably connected to the first sliding rod 41 is provided with an indicator needle 44 for indicating the scale.

[0041] Further, such as Figure 2 , 3 As shown, in order to achieve the electric cylinder pushing the heavy object upwards and braking the driving rod 2 by preventing the connecting rod 42 from moving downwards when the power is off, the left side of the connecting rod 42 is provided with a left ratchet bar 421 with teeth opening facing downwards, and the right side is provided with a right ratchet bar 422 with teeth opening facing downwards;

[0042] The brake mechanism 6 includes a first brake assembly 61 and a second brake assembly 62 connected to the outer side of the cylinder body 1 through a buffer assembly 5, the first brake assembly 61 is located on one side of the left ratchet bar 421, the second brake assembly 62 is located on one side of the right ratchet bar 422, the second brake assembly 62 includes a second pawl 621 engaged with the right ratchet bar 422 for preventing the connecting rod 42 from moving downward, and a second connecting block 622 connected to the buffer assembly 5;

[0043] The second pawl 621 is connected to the second connecting block 622 and can rotate relative to the right ratchet bar 422. The second connecting block 622 is located above the second pawl 621 and is provided with a second electromagnet 623. The second electromagnet 623 moves the second pawl 621 away from the right ratchet bar 422 when powered, and the second pawl 621 is engaged with the right ratchet bar 422 when the first electromagnet 613 is de-powered.

[0044] In this embodiment, initially, the second electromagnet 623 is energized and attracts the second pawl 621. At this time, the second pawl 621 is away from the right ratchet bar 422 of the connecting rod 42, and the servo electric cylinder is in normal operation; when the servo electric cylinder is suddenly powered off during driving, the servo electric cylinder loses driving force, and the pushed heavy object drives the driving rod 2 to move rapidly in the opposite direction under the action of gravity; at the same time, the second electromagnet 623 is in a de-energized state and loses its magnetic force, and the second pawl 621 rotates toward the connecting rod 42, meshing with the right ratchet bar 422 moving downward, stopping the connecting rod 42 from continuing to move downward, and preventing the driving rod 2 from continuing to move downward and impacting the servo electric cylinder body, causing damage to internal parts.

[0045] Further, such as Figure 2 , 2 As shown, in order to achieve braking the driving rod 2 by preventing the connecting rod 42 from moving downward when the electric cylinder is inverted and pulls the heavy object downward and the power is cut off, the first brake assembly 61 includes a first pawl 611 engaged with the left ratchet bar 421 to prevent the connecting rod 42 from moving upward, and a first connecting block 612 connected to the buffer assembly 5;

[0046] The first pawl 611 is connected to the first connecting block 612 and can be rotated relative to the left ratchet bar 421. The first connecting block 612 is located below the first pawl 611 and is provided with a first electromagnet 613. A torsion spring 614 is provided between the first connecting block 612 and the first pawl 611. When the first electromagnet 613 is energized, the first pawl 611 is moved away from the left ratchet bar 421. When the first electromagnet 613 is de-energized, the torsion spring 614 causes the first pawl 611 to rotate and engage with the left ratchet bar 421.

[0047] In this embodiment, initially, the first electromagnet 613 is energized and attracts the first pawl 611. At this time, the first pawl 611 is away from the left ratchet bar 421 of the connecting rod 42, and the servo electric cylinder is in a normal operating state; when the servo electric cylinder is suddenly powered off during driving, the servo electric cylinder loses driving force, and the pulled heavy object drives the driving rod 2 to move rapidly in the opposite direction under the action of gravity; at the same time, the first electromagnet 613 is in a de-energized state and loses its magnetic force. The first pawl 611 rotates toward the connecting rod 42 under the action of the torsion spring 614, and meshes with the left ratchet bar 421 moving downward, stopping the connecting rod 42 from continuing to move downward, preventing the driving rod 2 from continuing to move downward, causing the screw pair to impact the servo electric cylinder body, and causing damage to internal parts.

[0048] In summary, the above structure enables the electric cylinder to quickly brake the pushed or pulled driving rod 2 when the power is off, thereby protecting the electric cylinder and being suitable for high-load conditions of pushing and pulling heavy objects.

[0049] Further, such as Figure 1 , 2 As shown in , 3 and 5, in order to effectively absorb the impact force of the hand during the braking process of the driving rod 2, the buffer assembly 5 includes a second connecting seat 51 connected to the cylinder body 1, and two ends of the second slide bar 52 respectively connected to the two ends of the second connecting seat 51, and the second connecting block 622 and the first connecting block 612 of the first brake assembly 61 are respectively slidably sleeved with the second slide bar 52;

[0050] The buffer assembly 5 further includes a buffer member 53 slidably sleeved with the second slide bar 52, the first connection block 612 is located below the buffer member 53, and the second connection block 622 is located above the buffer member 53. When the braking process is subjected to impact force, the first connection block 612 and the second connection block 622 slide relative to the corresponding second slide bar 52, so that part of the impact force is converted into elastic potential energy of the buffer member 53, thereby effectively preventing the brake mechanism 6 from being damaged and failing due to rapid braking impact, thereby improving the reliability of use.

[0051] Furthermore, the buffer member 53 is rubber or a spring or a combination thereof.

[0052] Further, such as Figure 3 As shown, in order to improve the sliding stability of the brake assembly relative to the buffer assembly 5 and improve the buffering effect of braking, more than two second slide bars 52 are provided, and the buffer members 53 are provided in a one-to-one correspondence with the second slide bars 52.

[0053] Further, such as Figure 1 , 2 As shown in , 4 , it also includes a transmission component 7, and the screw pair is connected to the driving end of the servo motor 3 through the transmission component 7.

[0054] In this embodiment, the transmission assembly 7 is composed of a synchronous belt, a driving synchronous pulley, and a driven synchronous pulley. Its structure and working principle are conventional technologies and will not be described in detail here.

[0055] 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 controllable servo electric cylinder, comprising a cylinder body, a lead screw pair and a servo motor, characterized in that: The screw pair is arranged in the driving cavity of the cylinder body, the screw pair is drivingly connected to the driving end of the servo motor, and the screw pair includes a driving rod that can be axially extended and retracted relative to the cylinder body; A measuring device connected to the drive rod is provided on the outside of the cylinder body, and the measuring device is used to monitor and correct the push-out length of the drive rod. A buffer brake device is provided on the side of the cylinder body located at the measuring device, and the buffer brake device includes a buffer assembly connected to the cylinder body, and a brake mechanism connected to the buffer assembly. The brake mechanism is used to limit the axial reverse movement of the pushed or pulled drive rod relative to the cylinder body when power is off, and the buffer assembly is used to absorb part of the impact force exerted on the brake mechanism.

2. A controllable servo electric cylinder according to claim 1, characterized in that: The measuring device comprises a first sliding rod, a connecting rod and a first connecting seat extending axially from one end of the cylinder body to the other end; The two ends of the first sliding rod are respectively connected to the two ends of the first connecting seat, and the connecting rod is in a right angle shape, one end of which is connected to the driving rod, and the other end is slidably connected to the first sliding rod; The braking mechanism prevents the driving rod from moving in the reverse direction by limiting the sliding movement of the connecting rod relative to the first sliding rod.

3. A controllable servo electric cylinder according to claim 2, characterized in that: The surface of the first connecting seat is provided with a scale, and one end of the connecting rod slidably connected to the first sliding rod is provided with an indicating needle for indicating the scale.

4. A controllable servo electric cylinder according to claim 2, characterized in that: The left side of the connecting rod is provided with a left ratchet bar with teeth opening facing downwards, and the right side of the connecting rod is provided with a right ratchet bar with teeth opening facing downwards; The brake mechanism comprises a first brake assembly and a second brake assembly connected to the outer side of the cylinder body through a buffer assembly, the first brake assembly is located on one side of the left ratchet bar, the second brake assembly is located on one side of the right ratchet bar, the second brake assembly comprises a second pawl engaged with the right ratchet bar for preventing the connecting rod from moving downward, and a second connecting block connected to the buffer assembly; The second pawl can be rotatable relative to the right ratchet bar and is connected to the second connecting block. The second connecting block is located above the second pawl and is provided with a second electromagnet. The second electromagnet moves the second pawl away from the right ratchet bar when the second electromagnet is energized, and the second pawl is engaged with the right ratchet bar when the first electromagnet is de-energized.

5. The controllable servo electric cylinder according to claim 4, characterized in that: The first brake assembly includes a first pawl engaged with the left ratchet bar for preventing the connecting rod from moving upward, and a first connecting block connected to the buffer assembly; The first pawl can be rotatable relative to the left ratchet bar and is connected to the first connecting block. The first connecting block is located below the first pawl and is provided with a first electromagnet. A torsion spring is provided between the first connecting block and the first pawl. When the first electromagnet is energized, the first pawl moves away from the left ratchet bar. When the first electromagnet is de-energized, the torsion spring causes the first pawl to rotate and engage with the left ratchet bar.

6. A controllable servo electric cylinder according to claim 4 or 5, characterized in that: The buffer assembly comprises a second connecting seat connected to the cylinder body, and a second sliding rod having two ends respectively connected to two ends of the second connecting seat, and the second connecting block and the first connecting block of the first brake assembly are respectively slidably sleeved with the second sliding rod; The buffer assembly also includes a buffer member slidably sleeved with the second sliding rod, the first connecting block is located below the buffer member, and the second connecting block is located above the buffer member.

7. The controllable servo electric cylinder according to claim 6, characterized in that: The buffer is rubber or a spring or a combination thereof.

8. The controllable servo electric cylinder according to claim 6, characterized in that: There are more than two second sliding bars, and the buffers are arranged in one-to-one correspondence with the second sliding bars.

9. The controllable servo electric cylinder according to claim 1, characterized in that: It also includes a transmission assembly, and the screw pair is transmission-connected to the driving end of the servo motor through the transmission assembly.

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