Linear driver and electric furniture
By setting up detection modules and triggers in the linear drive, the precise control of the push rod is achieved, the balance problem of the middle gear of the electric health care bed is solved, and the accuracy and safety of the morphological changes of the electric furniture are improved.
Patent Information
- Application Number
- CN202421844441.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-01
AI Technical Summary
The existing linear drive cannot accurately extend the push rod to the middle gear of the electric health bed, resulting in the bed being unable to maintain balance, which poses a safety hazard.
The linear driver is adopted to include a housing, a driving mechanism and a detection module. The detection module is provided with a first and a second trigger member. The driving member stops moving when the trigger member is triggered simultaneously to ensure that the push rod moves accurately to the intermediate gear.
Improve the stroke control accuracy of linear drives, ensure the accuracy of the form changes of electric furniture, and reduce maintenance and production costs.
Smart Images
Figure CN223168155U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric drive, in particular to a linear drive and electric furniture. Background Art
[0002] A linear actuator is a device that converts the rotational motion of a motor into the linear reciprocating motion of a push rod. As the power element in various forms of electric furniture, such as electric hospital beds, electric nursing beds, electric sofas, electric leisure beds, and electric height-adjustable tables, the control accuracy of the actuator's motion directly impacts the functionality of these products.
[0003] For example, an electric health care bed with a side-tilt function has a special middle position. When the linear actuator's push rod extends less than the middle position, the bed tilts to the left. When the linear actuator's push rod extends to the middle position, the bed is balanced. When the linear actuator's push rod extends beyond the middle position, the bed tilts to the right. The middle position is primarily designed to prevent bedsores caused by prolonged bed rest.
[0004] Due to the particularity of the middle gear of the electric health care bed, if the linear drive cannot accurately extend the push rod to the position of the middle gear, it may easily cause the bed to lose balance, thereby posing a safety hazard to the user. Utility Model Content
[0005] The purpose of the present utility model is to provide a linear drive and electric furniture, which have higher stroke control accuracy than existing linear drives, can ensure that the push rod of the linear drive can accurately move to the required position, thereby improving the accuracy of the shape change of the electric furniture.
[0006] To achieve this purpose, the present invention adopts the following technical solutions:
[0007] In one aspect, a linear actuator is provided, the linear actuator comprising:
[0008] case;
[0009] The driving mechanism includes a driving member, a linear motion member, and a triggering portion, wherein the linear motion member is in transmission connection with an output end of the driving member, and the driving member is fixed to the housing and is capable of driving the linear motion member to move linearly in a first direction;
[0010] A detection module, wherein the detection module includes a first trigger member and a second trigger member sequentially arranged along a first direction, and the detection module is communicatively connected with the driving member;
[0011] One of the detection module and the trigger part is arranged on the housing, and the other is arranged on the linear motion part;
[0012] The driving member is configured to stop driving the linear motion member to move linearly along the first direction when the triggering portion triggers the first triggering member and the second triggering member simultaneously.
[0013] Preferably, the driving mechanism further comprises a lead screw, and the driving member is a motor;
[0014] The lead screw is arranged along a first direction and is threadedly matched with the linear motion member. One end of the lead screw is transmission-connected to the motor. The motor can drive the lead screw to rotate so that the linear motion member moves linearly along the lead screw.
[0015] Preferably, when the detection module is arranged on the housing, the trigger part is detachably connected to the linear motion part.
[0016] Preferably, the first trigger member has a protruding first trigger point, and the second trigger member has a protruding second trigger point, and the first trigger point and the second trigger point are spaced apart along the first direction.
[0017] Preferably, when the trigger portion triggers the first trigger point and the second trigger point simultaneously, a midline of the trigger portion in the first direction coincides with a midline between the first trigger point and the second trigger point.
[0018] Preferably, the housing comprises:
[0019] A first mounting seat and a second mounting seat, wherein the first mounting seat and the second mounting seat are spaced apart along a first direction, and a distance between the first mounting seat and the second mounting seat is adjustable;
[0020] One end of the adjusting rod is connected to the first mounting seat, and the other end is connected to the second mounting seat. The detection module is installed on the adjusting rod.
[0021] Preferably, the adjustment rod includes a rod body and multiple adjustment members, one end of the rod body is connected to one of the first mounting seat and the second mounting seat, and the other end of the rod body is connected to the other of the first mounting seat and the second mounting seat through the required number of adjustment members.
[0022] Preferably, the linear drive also includes a clamping member, which is fixed on the adjusting rod and has an accommodating groove for accommodating the first trigger member and the second trigger member; the clamping member is detachably fixedly connected to the first trigger member; and / or the clamping member is detachably fixedly connected to the second trigger member.
[0023] Preferably, the clamping member has a long waist hole perpendicular to the extension direction of the adjusting rod, and the rod body has a fixing hole corresponding to the long waist hole. The fastener is passed through the long waist hole and threadedly connected to the rod body, and the position of the clamping member relative to the adjusting rod along the extension direction of the long waist hole is adjustable.
[0024] On the other hand, an electric furniture is provided, including the above linear actuator.
[0025] Advantages of the utility model:
[0026] The linear actuator provided by the utility model includes a housing, a driving mechanism and a detection module. In the driving mechanism, the output end of the driving member is in transmission connection with the linear moving member and can drive the linear moving member to move linearly along the first direction. The detection module includes a first trigger member and a second trigger member arranged in sequence along the first direction, and the detection module is communicatively connected with the driving member. One of the detection module and the trigger part is connected to the housing, and the other is connected to the linear moving member; the driving member is configured to stop driving the linear moving member to move linearly along the first direction when the trigger part triggers the first trigger member and the second trigger member at the same time, so as to accurately control the moving position of the linear moving member, thereby improving the stroke control accuracy of the linear actuator. The present invention also provides an electric furniture, by applying the above linear actuator, the accuracy of the morphological change of the electric furniture can be improved. Description of the drawings
[0027] Figure 1 is a schematic structural diagram of the linear actuator provided by the utility model;
[0028] Figure 2 is a schematic side view structural diagram of the linear actuator provided by the utility model;
[0029] Figure 3 is Figure 2 a partial structural diagram of the linear actuator in
[0030] Figure 4 is Figure 3 a structural diagram of the linear actuator in after removing the clamping member;
[0031] Figure 5 is Figure 4 a front view structural diagram of the linear actuator in .
[0032] In the figure:
[0033] 1. Housing; 11. First mounting seat; 12. Second mounting seat; 13. Adjusting rod; 131. Rod main body; 1311. Fixing hole; 132. Adjusting member;
[0034] 2. Driving mechanism; 21. Motor; 22. Lead screw; 23. Linear moving member; 24. Trigger part;
[0035] 3. Detection module; 31. First trigger member; 311. First trigger point; 32. Second trigger member; 321. Second trigger point;
[0036] 4. Clamping member; 41. Accommodating groove; 42. Long waist hole. Detailed implementation mode
[0037] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.
[0038] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0039] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.
[0040] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, 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 to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.
[0041] Figure 1 The structural schematic diagram of the linear driver provided by the present utility model is shown. Figure 2 The side view structural schematic diagram of the linear driver provided by the embodiment of the present utility model is shown. Figure 3 Shown is Figure 2 The partial structural schematic diagram of the linear driver in Figures 1 to 3As shown in the figure, the linear actuator includes a housing 1, a driving mechanism 2, and a detection module 3. The driving mechanism 2 includes a driving member, a linear moving member 23, and a triggering portion 24. In this embodiment, the first direction is parallel to the direction in which the push rod extends, and the linear moving member 23 is coaxially connected to the push rod. The linear moving member 23 is drivingly connected to the output end of the driving member, and the driving member is fixed to the housing 1 and can drive the linear moving member 23 to move linearly in the first direction. The detection module 3 includes a first triggering member 31 and a second triggering member 32 arranged in sequence in the first direction. The detection module 3 is communicatively connected to the driving member. One of the detection module 3 and the triggering portion 24 is arranged on the housing 1, and the other is arranged on the linear moving member 23. The driving member is configured to stop driving the linear moving member 23 to move linearly in the first direction when the triggering portion 24 simultaneously triggers the first triggering member 31 and the second triggering member 32, so as to make the linear moving member 23 accurately stop at a specific position, thereby improving the stroke control accuracy of the linear actuator. Specifically, the first triggering member 31 and the second triggering member 32 can be microswitches, and the detection module 3 is communicatively connected to the MCU (micro control unit) of the driving member.
[0042] The linear actuator provided by the present utility model can be of various types. Taking an electric push rod as an example, the driving mechanism 2 further includes a lead screw 22, and the driving member is a motor 21. The lead screw 22 is arranged in the first direction and is in threaded cooperation with the linear moving member 23. One end of the lead screw 22 is drivingly connected to the motor 21, and the motor 21 can drive the lead screw 22 to rotate, so that the linear moving member 23 moves linearly along the lead screw 22. Specifically, the linear moving member 23 can be a lead screw nut, which is in threaded cooperation with the lead screw 22 and is coaxially connected to the push rod.
[0043] It can be understood that the linear actuator can also adopt other electric products, not limited to the electric push rod, and can also be a linear module (such as a linear motor, etc.). As long as the motion output member can perform an output linear motion, the actuator is within the scope of protection of the present utility model. Those skilled in the art can set the positions of the first triggering member 31 and the second triggering member 32 according to the characteristics of the specific positions required by the corresponding electric products, so as to ensure that the linear actuator can meet the needs of the corresponding electric products, and no further examples will be given here.
[0044] When the linear actuator is applied to a health care bed, by setting the center line between the first triggering member 31 and the second triggering member 32 at the position of the middle gear of the linear actuator, the spatial position of the linear moving member 23 in the first direction can be accurately controlled, ensuring that the length of the push rod connected to the linear moving member 23 is at the position of the middle gear of the linear actuator, and ensuring that the electric health care bed can be in a balanced state.
[0045] In some embodiments, the linear actuator can also be applied to other electric furniture that can undergo morphological changes, such as electric hospital beds, electric sofas, electric reclining beds, and electric lift tables, to improve the accuracy of morphological changes of the electric furniture.
[0046] When the detection module 3 is fixed to the housing 1 and the triggering part 24 is fixed to the linear moving part 23, the triggering part 24 and the linear moving part 23 can be directly connected and integrally formed, thereby reducing the production cost of the linear moving part 23. Of course, the triggering part 24 and the linear moving part 23 can also be detachably connected to facilitate the disassembly, installation, and replacement of the triggering part 24. When the triggering part 24 is worn due to long-term use of the linear actuator, by replacing the triggering part 24, there is no need to replace the linear moving part 23 to reduce the maintenance cost of the linear actuator.
[0047] Figure 4 Shows Figure 3 The structural schematic diagram of the linear actuator in [[]] after removing the clamping part 4, Figure 5 Shows Figure 4 The front view structural schematic diagram of the linear actuator in [[]], as Figures 2 to 5 shown, the first triggering part 31 has a first triggering point 311 protruding therefrom, the second triggering part 32 has a second triggering point 321 protruding therefrom, and the first triggering point 311 and the second triggering point 321 are spaced apart to ensure that there can be a certain distance between the first triggering point 311 and the second triggering point 321, and the first triggering point 311 and the second triggering point 321 are arranged opposite to the triggering part 24, so as to ensure that when the triggering part 24 moves along the first direction on the lead screw 22, the first triggering point 311 and the second triggering point 321 can be triggered.
[0048] Furthermore, the triggering part 24 can be a plastic block made of plastic material, which can reduce the impact strength on the first triggering point 311 and the second triggering point 321 when contacting them, thereby preventing the first triggering point 311 and the second triggering point 321 from being worn due to impact, and effectively improving the service life of the first triggering part 31 and the second triggering part 32.
[0049] It can be understood that the plastic material belongs to the prior art and can be nylon, polyoxymethylene, bakelite, etc. All plastic materials that can reduce the impact strength of the triggering part 24 on the first triggering point 311 and the second triggering point 321 are within the protection scope of this application. The specific type and structure of the plastic material are common materials and structures in the field, and adopting any specific material of the existing plastic materials can achieve the reduction of the impact strength on the contact points of the detection part in this application.
[0050] In some embodiments, the first trigger point 311 and the second trigger point 321 are laser transceiver heads, and the first trigger member 31 and the second trigger member 32 are photoelectric switches. When the linear motion member 23 triggers the first trigger point 311 or the second trigger point 321, the linear motion member 23 does not come into contact with the first trigger point 311 or the second trigger point 321, so that the linear motion member 23 will not collide with the first trigger point 311 and the second trigger point 321, thereby extending the service life of the first trigger member 31 and the second trigger member 32.
[0051] When the extending length of the push rod of the linear driver is at the position of the middle gear, the mid-line position of the trigger part 24 in the first direction is the first position, and the spatial position of the mid-line between the first trigger point 311 and the second trigger point 321 in the first direction is the second position. Only when the first trigger point 311 and the second trigger point 321 are simultaneously triggered by the trigger part 24 and the first position and the second position coincide with each other can it be ensured that the extending length of the push rod of the linear driver is at the middle gear. Therefore, as Figures 2 to 5 shown, in the state where both the first trigger point 311 and the second trigger point 321 are triggered by the trigger part 24, the motor 21 stops rotating, and the mid-line of the trigger part 24 in the first direction coincides with the mid-line between the first trigger point 311 and the second trigger point 321.
[0052] Because the spatial position of the mid-line between the first trigger point 311 and the second trigger point 321 in the first direction is affected by the installation accuracy factor, the mid-line position of the mid-line between the first trigger point 311 and the second trigger point 321 in the first direction may not exactly coincide with the first position, resulting in poor detection accuracy of the detection module 3. Therefore, continue Figures 2 to 5 shown, the housing 1 includes a first mounting seat 11 and a second mounting seat 12 that are spaced apart from each other in the first direction. The distance between the first mounting seat 11 and the second mounting seat 12 is adjustable, and the distance between the first mounting seat 11 and the second mounting seat 12 is adjustable. The housing 1 further includes an adjusting rod 13. One end of the adjusting rod 13 is connected to the first mounting seat 11, and the other end is connected to the second mounting seat 12. The detection module 3 is mounted on the adjusting rod 13. When the distance between the first mounting seat 11 and the second mounting seat 12 is adjusted, the spatial position of the detection module 3 in the first direction can be changed so that when the first trigger point 311 and the second trigger point 321 are simultaneously triggered by the trigger part 24, the mid-line between the first trigger point 311 and the second trigger point 321 can coincide with the first position, ensuring the detection accuracy of the detection module 3.
[0053] As Figure 4As shown in the figure, the adjusting rod 13 includes a rod body 131 and a plurality of adjusting members 132. One end of the rod body 131 is connected to one of the first mounting seat 11 and the second mounting seat 12, and the other end of the rod body 131 is connected to the other of the first mounting seat 11 and the second mounting seat 12 through the required number of adjusting members 132. The adjusting member 132 itself has a thickness and can adjust the spatial position of the detection module 3 in the first direction. By setting the required number of adjusting members 132, the accuracy of adjusting the spatial position of the midline between the first trigger point 311 and the second trigger point 321 in the first direction is improved, the debugging efficiency of the linear actuator is improved, and the detection accuracy of the detection module 3 is indirectly ensured.
[0054] As Figures 2 to 5 shown in the figure, the linear actuator further includes a clamping member 4. The clamping member 4 is fixed on the adjusting rod 13. The clamping member 4 has a receiving groove 41 for receiving the first trigger member 31 and the second trigger member 32. By placing the trigger member in the receiving groove 41, the trigger member can be protected from being damaged by external impact. More importantly, the first trigger member 31 and the second trigger member 32 can be clamped to ensure that the distance between the first trigger point 311 and the second trigger point 321 does not change during the use of the linear actuator. Thus, the spatial position of the midline between the first trigger point 311 and the second trigger point 321 in the first direction does not change, thereby improving the detection accuracy of the detection module 3.
[0055] The clamping member 4 is detachably and fixedly connected to the first trigger member 31. The clamping member 4 is also detachably and fixedly connected to the second trigger member 32. Thus, when the trigger member is damaged, the trigger member can be quickly replaced to improve the maintainability of the linear actuator.
[0056] For trigger members of different specifications, the trigger point specifications of the trigger members are also different, resulting in different heights of the trigger points protruding from the trigger members. There is a deficiency that the triggering portion 24 cannot trigger the first trigger point 311 or the second trigger point 321. Therefore, the clamping member 4 has an oblong hole 42 perpendicular to the extending direction of the adjusting rod 13, and the rod body 131 has a fixing hole 1311 corresponding to and communicating with the oblong hole 42. A fastener passes through the oblong hole 42 and is threadedly connected to the rod body 131, and the clamping member 4 is adjustable in position along the extending direction of the oblong hole 42 relative to the adjusting rod 13. Thus, the spatial positions of the first trigger point 311 in the first trigger member 31 and the second trigger point 321 in the second trigger member 32 perpendicular to the extending direction of the adjusting rod 13 can be adjusted to ensure that the triggering portion 24 can contact and trigger the first trigger point 311 and the second trigger point 321 when it moves.
[0057] This embodiment provides a method for detecting and adjusting the specific position of a linear actuator. Taking the detection module 3 and the linear moving member 23 as examples, the linear actuator adjustment method provided in this embodiment will be described:
[0058] S100. The staff activates the linear actuator. The motor 21 drives the lead screw 22 to rotate forward, so that the triggering part 24 triggers the first trigger 31. The power of the motor 21 is reduced to lower the forward rotation speed of the lead screw 22, reducing the inertia of the linear moving part 23. Thus, when the triggering part 24 triggers both the first trigger 31 and the second trigger 32 simultaneously, the linear moving part 23 can immediately stop moving, improving the accuracy detection of the specific position of the linear moving part 23. Or the motor 21 drives the lead screw 22 to rotate in reverse, so that the triggering part 24 triggers the second trigger 32. The power of the motor 21 is reduced to lower the reverse rotation speed of the lead screw 22, reducing the inertia of the linear moving part 23. Thus, when the triggering part 24 triggers both the first trigger 31 and the second trigger 32 simultaneously, the linear moving part 23 can immediately stop moving, improving the accuracy detection of the specific position of the linear moving part 23 and making the push rod extend, so that the extended length of the push rod of the linear actuator is at the position of the middle gear.
[0059] S200. After performing the operation of S100, if it is found that the extended length of the push rod of the linear actuator is not at the position of the middle gear, it may be necessary to adjust the distance between the first mounting seat 11 and the second mounting seat 12 to adjust the spatial position of the midline between the first trigger point 311 and the second trigger point 321 in the first direction.
[0060] S300. Calculate the required adjustment distance of the midline between the first trigger point 311 and the second trigger point 321, and prepare the required number of adjusting parts 132 according to the adjustment distance.
[0061] S400. One end of the rod body 131 is connected to one of the first mounting seat 11 and the second mounting seat 12 through the required number of adjusting parts 132, thus completing the debugging work of the linear actuator.
[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A linear actuator, characterized in that, The linear actuator includes: a housing (1); a driving mechanism (2), including a driving member, a linear moving member (23) and a triggering portion (24), wherein the linear moving member (23) is in transmission connection with the output end of the driving member, and the driving member is fixed to the housing (1) and can drive the linear moving member (23) to move linearly in a first direction; a detection module (3), the detection module (3) includes a first triggering member (31) and a second triggering member (32) arranged in sequence along the first direction, and the detection module (3) is in communication connection with the driving member; One of the detection module (3) and the triggering portion (24) is arranged on the housing (1), and the other is arranged on the linear moving member (23); The driving member is configured to stop driving the linear moving member (23) when the triggering portion (24) triggers both the first triggering member (31) and the second triggering member (32) simultaneously.
2. The linear actuator according to claim 1, wherein the driving mechanism (2) further includes a lead screw (22), and the driving member is a motor (21); the lead screw (22) is arranged along the first direction and is in threaded cooperation with the linear moving member (23), one end of the lead screw (22) is in transmission connection with the motor (21), and the motor (21) can drive the lead screw (22) to rotate so that the linear moving member (23) moves linearly along the lead screw (22).
3. The linear actuator according to claim 2, characterized in that, When the detection module (3) is arranged on the housing (1), the triggering portion (24) is detachably connected to the linear moving member (23).
4. The linear actuator according to claim 3, characterized in that, The first triggering member (31) has a first triggering point (311) protruding therefrom, the second triggering member (32) has a second triggering point (321) protruding therefrom, and the first triggering point (311) and the second triggering point (321) are spaced apart along the first direction.
5. The linear actuator according to claim 4, wherein, In a state where the triggering portion (24) triggers both the first triggering point (311) and the second triggering point (321) simultaneously, the midline of the triggering portion (24) in the first direction coincides with the midline between the first triggering point (311) and the second triggering point (321).
6. The linear actuator according to any one of claims 1-5, characterized in that, The housing (1) includes: a first mounting seat (11) and a second mounting seat (12), the first mounting seat (11) and the second mounting seat (12) are spaced apart along the first direction, and the distance between the first mounting seat (11) and the second mounting seat (12) is adjustable; an adjusting rod (13), one end of which is connected to the first mounting seat (11), and the other end of which is connected to the second mounting seat (12), and the detection module (3) is mounted on the adjusting rod (13).
7. The linear actuator according to claim 6, wherein The adjusting rod (13) includes a rod body (131) and a plurality of adjusting members (132). One end of the rod body (131) is connected to one of the first mounting seat (11) and the second mounting seat (12), and the other end of the rod body (131) is connected to the other of the first mounting seat (11) and the second mounting seat (12) through the required number of the adjusting members (132).
8. The linear actuator according to claim 7, characterized in that, The linear actuator further includes a clamping member (4). The clamping member (4) is fixed on the adjusting rod (13), and the clamping member (4) has a receiving groove (41) for receiving the first trigger member (31) and the second trigger member (32); the clamping member (4) is detachably and fixedly connected to the first trigger member (31); and / or the clamping member (4) is detachably and fixedly connected to the second trigger member (32).
9. The linear actuator according to claim 8, wherein The clamping member (4) has an oblong hole (42) perpendicular to the extending direction of the adjusting rod (13). The rod body (131) has a fixing hole (1311) corresponding to and communicating with the oblong hole (42). A fastener passes through the oblong hole (42) and is threadedly connected to the rod body (131), so that the clamping member (4) is position-adjustable relative to the adjusting rod (13) along the extending direction of the oblong hole (42).
10. An electric furniture, characterized in that, It includes the linear actuator according to any one of claims 1-9.