Electric cylinder with screw rod safety clutch top-rushing prevention device
By designing the guide flat key-controlled buffer assembly in the electric cylinder and moving in concert with the nut, the problem of high-speed impact of the screw nut in the electric cylinder is solved, achieving the effect of protecting the screw and simplifying maintenance.
Patent Information
- Application Number
- CN202510003381.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-04-18
AI Technical Summary
In electric cylinders, due to improper motor control or failure of external electrical limits, the screw nut may hit the front end cover or bearing seat at high speed, resulting in a large impact force, causing the screw to be stuck in a state, making it difficult to solve the maintenance problem after the top.
An electric cylinder containing a screw safety clutch anti-shooting device is designed. By setting a guide flat key on the outer side wall of the cylinder, the coordinated movement between the buffer assembly and the nut is controlled, and a radial movement guide is provided for the guide flat key through the V-shaped groove to avoid impact between the nut and the front end cover.
It effectively avoids the impact between the screw nut and the front end cover, protects the screw, avoids damage to important components of the electric cylinder, simplifies the maintenance process after the top punch, and reduces the maintenance cost and difficulty.
Smart Images
Figure CN119853346A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electric cylinders, and in particular to an electric cylinder including a screw rod safety clutch and anti-collision device. Background Art
[0002] During customer use, due to improper motor control or failure of external electrical limit, the lead screw nut often collides with the front cover or bearing seat at high speed under load, and the impact force is often very large. In order to protect the lead screw, the buffer pad is generally made of soft materials such as aluminum alloy. After being deformed by impact, it will fit with the lead screw nut to generate an internal force of 4 times or more of the rated load. The magnitude of the internal force is equivalent to the axial force given to the lead screw by the lead screw nut at this time. At this time, the lead screw must be rotated to disengage the lead screw nut from the buffer pad, and the static friction between the lead screw nut and the lead screw under 4 times the rated load must be overcome. Often the rated torque of the motor cannot reach such a large torque, so the lead screw will always be in a stuck state.
[0003] When the screw rod hits the top (or bottom), it will impact the front cover (or bearing seat), causing the front cover (or bearing seat) to separate from the cylinder body, causing it to deform and damage important parts of the electric cylinder. It is also difficult to repair. The current solutions to the top are as follows:
[0004] Method 1: Remove the motor and use a fake shaft to force the screw to rotate. This method will use a large torque, which may cause deformation of transmission parts such as keys and keyways, affecting the rotation accuracy of the electric cylinder; at the same time, the screw has already caused impact damage after impact, and forced over-torque rotation will cause secondary damage to the screw.
[0005] Method 2: Disassemble the electric cylinder. This method requires professional disassembly, and customers cannot solve it by themselves. It also takes a long time. The time cost and economic cost are very high.
[0006] The above two methods require a larger operating space. Some electric cylinders are often integrated into other equipment, so the operating space is limited. Summary of the invention
[0007] The present invention is intended to solve one of the problems existing in the background technology.
[0008] To this end, the present invention provides an electric cylinder including a screw rod safety clutch anti-collision device.
[0009] The technical solution adopted by the present invention to solve its technical problem is:
[0010] An electric cylinder with a screw rod safety clutch anti-collision device, comprising:
[0011] A cylinder body, wherein the opening end of the cylinder body is provided with a front end cover;
[0012] An output screw, the output screw being rotatably disposed in the cylinder body;
[0013] A nut, which is sleeved on the output screw and matches with the thread of the output screw;
[0014] An output shaft, wherein the output shaft sleeve is arranged on the output screw rod and connected with the nut;
[0015] The guide flat key is movably arranged on the cylinder body and plugged into the nut. The nut is provided with a slot for inserting the guide flat key. Along the axial direction of the cylinder body, the length of the slot is greater than the length of the guide flat key. The guide flat key can move along the axial and radial directions of the cylinder body. Before the nut collides with the front end cover, the plug-in relationship between the guide flat key and the nut is released, so that the nut rotates with the output screw.
[0016] Furthermore, along the axial direction of the cylinder body, the length of the slot is 1.2 to 1.3 times the length of the guide flat key.
[0017] Furthermore, a sliding block is provided on the outer wall of the cylinder body for sliding along its axial direction, and the sliding block is provided with a V-shaped groove with an opening away from the cylinder body. A sliding block is provided on the guide flat key, and the sliding block is located in the V-shaped groove and slidingly cooperates with the V-shaped groove.
[0018] Furthermore, a guide assembly is provided on the outer side wall of the cylinder body, and the guide assembly provides guidance for the guide flat key and the sliding block to move along the axial direction of the cylinder body.
[0019] Furthermore, the guide assembly includes a guide seat and a guide rod. The guide seat is provided with two guide seats respectively arranged at two ends of the cylinder body. The guide rod is connected between the two guide seats and is arranged along the axial direction of the cylinder body.
[0020] Furthermore, the guide rod is provided with two guide rods, which are respectively located on both sides of the guide flat key. A fixed block is passed through the guide rods. The fixed block can move along the guide rod and abut against the guide seat. The fixed block is located on the side of the sliding block away from the guide flat key. The two fixed blocks are connected together and fasten the sliding block to both sides of the guide flat key.
[0021] Furthermore, a receiving groove for receiving the sliding block is provided on the side wall of the fixed block facing the guide flat key.
[0022] Furthermore, the tops of the two fixed blocks are connected together by a connecting plate, a pre-tightening bolt is passed through the connecting plate, the pre-tightening bolt is screwed into the guide flat key, a spring is sleeved on the pre-tightening bolt, one end of the spring abuts against the head of the pre-tightening bolt, and the other end abuts against the top surface of the guide flat key.
[0023] Furthermore, the connection plate is provided with a through hole for the pre-tightening bolt to pass through, and the hole diameter of the through hole is 1.2 to 1.3 times the diameter of the pre-tightening bolt.
[0024] Furthermore, a thrust needle roller bearing is arranged on the side wall of the front end cover facing the nut.
[0025] The beneficial effects of the present invention are that the application controls the coordinated movement between the external buffer assembly and the nut by setting a guide flat key on the outer wall of the cylinder body, and provides guidance for the guide flat key for radial movement along the cylinder body through the setting of a V-shaped groove, and protects the nut from the possibility of collision between the nut and the front cover through the collision between the fixed block outside the cylinder body and the guide seat. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0027] Figure 1 It is a schematic diagram of the overall structure of the electric cylinder containing the screw rod safety clutch anti-collision device in the present invention.
[0028] Figure 2 It is a structural schematic diagram of the plug-in relationship between the guide flat key and the nut in the present invention.
[0029] Figure 3 It is used to reflect Figure 2 Enlarged view of part A of the center guide flat key structure.
[0030] Figure 4 It is a side view of the cylinder body of the present invention.
[0031] Figure 5 It is used to reflect Figure 4 Enlarged view of part B showing the installation relationship between the fixed block and the sliding block.
[0032] Figure 6 It is a structural schematic diagram of the nut in the present invention.
[0033] Figure 7 It is a structural schematic diagram of the fixing block in the present invention.
[0034] Figure 8 It is a structural schematic diagram of the sliding block in the present invention.
[0035] Fig. 9 It is a structural schematic diagram of the guide flat key in the present invention.
[0036] Fig.10 It is a structural schematic diagram of the positional relationship between the guide flat key and the nut before the fixing block hits the guide seat in the present invention.
[0037] Fig.11It is a structural schematic diagram of the positional relationship between the guide flat key and the nut after the fixing block hits the guide seat in the present invention.
[0038] In the figure: 1. drive assembly; 11. cylinder body; 12. output screw; 13. nut; 131. slot; 14. output shaft; 15. front cover; 16. motor; 17. thrust needle roller bearing; 2. buffer assembly; 21. guide flat key; 211. slider; 22. sliding block; 221. V-groove; 222. limit block; 23. fixing block; 231. through opening; 232. limit groove; 233. through hole; 234. through groove; 24. guide seat; 25. guide rod; 26. preload bolt; 27. spring. DETAILED DESCRIPTION
[0039] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.
[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0042] An electric cylinder with a screw rod safety clutch anti-collision device comprises a driving component 1 and a buffer component 2.
[0043] The driving assembly 1 includes a cylinder body 11, an output screw 12, a nut 13, an output shaft 14, a front end cover 15 and a motor 16. Specifically, the nut 13 is slidably arranged inside the cylinder body 11 along the axial direction of the cylinder body 11, the output screw 12 is inserted into the cylinder body 11 and threadedly matched with the nut 13, the motor 16 is connected to the bottom of the cylinder body 11 and controls the rotation of the output screw 12, the output shaft 14 is sleeved on the output screw 12 and fixedly connected with the nut 13. The front end cover 15 is arranged at the open end of the cylinder body 11, the output shaft 14 passes through the front end cover 15 and slidably matches with the front end cover 15, and a thrust needle roller bearing 17 is installed on the side wall of the front end cover 15 in the cylinder body 11 facing the nut 13 for contacting with the nut 13.
[0044] The buffer assembly 2 is mounted on the outer wall of the cylinder 11 and acts on the nut 13. When the output screw 12 stalls, the nut 13 is controlled to rotate around the axis of the cylinder 11. Specifically, the buffer assembly 2 includes a guide flat key 21, a sliding block 22, a fixed block 23 and a guide assembly. The guide assembly includes a guide seat 24 and a guide rod 25. The guide seat 24 is installed at both ends of the side wall of the cylinder body 11. The guide rod 25 is fixed between the two guide seats 24. Two guide rods 25 are provided. The length direction of the guide rod 25 is arranged along the axial direction of the cylinder body 11. A slide groove is opened on the side wall of the cylinder body 11 along its axial direction. The slide groove penetrates the side wall of the cylinder body 11. The guide flat key 21 penetrates the slide groove and is plugged with the nut 13. A slot 131 for inserting the guide flat key 21 is opened on the side wall of the nut 13. It should be noted that along the axial direction of the cylinder body 11, the length of the slot 131 is greater than the length of the guide flat key 21. The length of the slot 131 is 1.2 to 1.3 times the length of the guide flat key 21, and preferably 1.2 times.
[0045] There are two fixed blocks 23, which are respectively arranged on both sides of the guide flat key 21 and respectively penetrated on the two guide rods 25. The tops of the two fixed blocks 23 are connected with connecting plates, and the two fixed blocks 23 are connected together through the connecting plates. A through hole 231 is arranged on the side wall of the fixed block 23 facing the guide flat key 21, and the sliding block 22 penetrates the through hole 231 along the axial direction of the guide rod 25. A limiting groove 232 is arranged on the top surface of the through hole 231. The top of the sliding block 22 is connected with a limiting block 222, and the limiting block 222 is clamped in the limiting groove 232 so that the sliding block 22 can move with the fixed block 23. A V-shaped groove is arranged on the side wall of the sliding block 22 facing the guide flat key 21, and the opening is away from the cylinder body 11. A slider 211 is connected to the guide flat key 21, and the slider 211 is located in the V-shaped groove and slides with the V-shaped groove. In this embodiment, the slider 211 is cylindrical, and the width H of the V-shaped groove is 1.15 times the diameter h of the slider 211. It should be noted that when the slider 211 is located at the lowest end of the V-shaped groove 221 , the distance D between the nut 13 and the front end cover 15 is greater than the distance d between the end of the sliding block 22 and the guide seat 24 arranged near the front end cover 15 .
[0046] A pre-tightening bolt 26 is arranged between the two connecting plates, and a through groove 234 is arranged on the side walls of the two connecting plates facing each other. The two threaded grooves are opposite to form a through hole 233 for the pre-tightening bolt 26 to pass through. The diameter of the through hole 233 is 1.2 to 1.3 times the diameter of the pre-tightening bolt 26, preferably 1.2 times. The pre-tightening bolt 26 is screwed into the guide flat key 21, and a spring 27 is sleeved on the pre-tightening bolt 26. One end of the spring 27 abuts against the head of the pre-tightening bolt 26, and the other end abuts against the top surface of the guide flat key 21. The pre-tightening force of the spring 27 can be controlled by the tightening depth of the pre-tightening bolt 26, thereby generating a suitable downward pressure on the guide flat key 21.
[0047] When the drive assembly 1 works normally, the slider 211 is located at the lowest end of the V-groove, and the guide flat key 21 is inserted into the slot 131 on the nut 13 to limit the circumferential rotation of the nut 13, so that the nut 13 can drive the output shaft 14 to move axially along the cylinder body 11.
[0048] When the output screw 12 stalls, the output screw 12 drives the nut 13 to rush toward the front cover 15, and the nut 13 drives the guide flat key 21, the sliding block 22, and the fixed block 23 to move toward the front cover 15. During this process, the fixed block 23 first collides with the guide seat 24 located at the front end of the cylinder body 11. At this time, the guide flat key 21 still moves toward the front end under the action of inertia, and the slider 211 moves upward along the V-shaped groove 221. The pre-tightening pressure of the spring 27 buffers most of the impact force of the screw nut 13, so that the guide flat key 21 disengages from the nut 13, so that the nut 13 contacts the end face of the thrust needle roller bearing 17 at a limited position, and the nut 13 starts to idle and no longer moves.
[0049] Since the end of the sliding block 22 abuts against the guide seat 24 provided near the front end cover 15, it is ensured that the screw nut 13 does not collide with the rod end flange. Due to the cooperation of the guide flat key 21 screw and the spring 27, when the piston rod moves in the reverse direction, the guide flat key 21 moves radially along the V-shaped groove 221 of the sliding block 22, and the guide flat key 21 cooperates with the keyway of the screw nut 13, so that the electric cylinder can move normally.
[0050] The present application is provided on the outer wall of the cylinder body 11, controls the coordinated movement between the external buffer assembly 2 and the nut 13 through a guide flat key 21, and provides guidance for the guide flat key 21 along the radial movement of the cylinder body 11 through the setting of a V-shaped groove, and protects the nut 13 from the possibility of collision between the nut 13 and the front cover through the collision between the external fixing block 23 of the cylinder body 11 and the guide seat 24.
[0051] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. An electric cylinder with a screw rod safety clutch anti-collision device, characterized in that: include, A cylinder body (11), wherein the opening end of the cylinder body (11) is provided with a front end cover (15); an output screw rod (12), the output screw rod (12) being rotatably disposed in the cylinder body (11); A nut (13), wherein the nut (13) is sleeved on the output screw rod (12) and is threadably matched with the output screw rod (12); An output shaft (14), wherein the output shaft (14) is sleeved on the output screw rod (12) and connected to the nut (13); A guide flat key (21), the guide flat key (21) is movably arranged on the cylinder body (11) and plugged into the nut (13), the nut (13) is provided with a slot (131) for inserting the guide flat key (21), along the axial direction of the cylinder body (11), the length of the slot (131) is greater than the length of the guide flat key (21), the guide flat key (21) can move along the axial and radial directions of the cylinder body (11), before the nut (13) collides with the front end cover (15), the plug-in relationship between the guide flat key (21) and the nut (13) is released, so that the nut (13) rotates.
2. The electric cylinder with screw rod safety clutch anti-collision device according to claim 1, characterized in that: Along the axial direction of the cylinder body (11), the length of the slot (131) is 1.2 to 1.3 times the length of the guide flat key (21).
3. The electric cylinder with screw rod safety clutch anti-collision device according to claim 1, characterized in that: A sliding block (22) is provided on the outer wall of the cylinder body (11) so as to slide along the axial direction thereof, and a V-shaped groove (221) is provided on the sliding block (22) whose opening is arranged away from the cylinder body (11). A sliding block (211) is provided on the guide key (21), and the sliding block (211) is located in the V-shaped groove (221) and is slidably matched with the V-shaped groove (221).
4. The electric cylinder with screw rod safety clutch anti-collision device according to claim 3 is characterized in that: A guide assembly is provided on the outer wall of the cylinder body (11), and the guide assembly provides guidance for the guide flat key (21) and the sliding block (22) to move axially along the cylinder body (11).
5. The electric cylinder with screw rod safety clutch anti-collision device according to claim 4, characterized in that: The guide assembly comprises a guide seat (24) and a guide rod (25); the guide seat (24) is provided with two guide seats (24) respectively arranged at two ends of the cylinder body (11); the guide rod (25) is connected between the two guide seats (24); and the guide rod (25) is arranged along the axial direction of the cylinder body (11).
6. The electric cylinder with screw rod safety clutch anti-collision device according to claim 5, characterized in that: Two guide rods (25) are provided, and the two guide rods (25) are respectively located on both sides of the guide flat key (21). A fixing block (23) is penetrated on each guide rod (25). The fixing block (23) can move along the guide rod (25) and abut against the guide seat (24). The fixing block (23) is located on a side of the sliding block (22) away from the guide flat key (21). The two fixing blocks (23) are connected together and fasten the sliding block (22) to both sides of the guide flat key (21).
7. The electric cylinder with a screw rod safety clutch anti-collision device according to claim 6, characterized in that: A receiving groove for receiving the sliding block (22) is provided on the side wall of the fixed block (23) facing the guide flat key (21).
8. The electric cylinder with a screw rod safety clutch anti-collision device according to claim 6, characterized in that: The tops of the two fixing blocks (23) are connected together by a connecting plate, a pre-tightening bolt (26) is passed through the connecting plate, the pre-tightening bolt (26) is screwed into the guide flat key (21), a spring (27) is sleeved on the pre-tightening bolt (26), one end of the spring (27) abuts against the head of the pre-tightening bolt (26), and the other end abuts against the top surface of the guide flat key (21).
9. The electric cylinder with screw rod safety clutch anti-collision device according to claim 8, characterized in that: The connecting plate is provided with a through hole (233) for the pre-tightening bolt (26) to pass through, and the hole diameter of the through hole (233) is 1.2 to 1.3 times the diameter of the pre-tightening bolt (26).
10. The electric cylinder with screw rod safety clutch anti-collision device according to claim 1, characterized in that: A thrust needle roller bearing (17) is arranged on the side wall of the front end cover (15) facing the nut (13).