CN216303137U - Electric lifting device capable of returning back when meeting resistance - Google Patents
Electric lifting device capable of returning back when meeting resistance Download PDFInfo
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- CN216303137U CN216303137U CN202121975769.7U CN202121975769U CN216303137U CN 216303137 U CN216303137 U CN 216303137U CN 202121975769 U CN202121975769 U CN 202121975769U CN 216303137 U CN216303137 U CN 216303137U
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Abstract
The utility model discloses an electric lifting device capable of returning after encountering a resistance, which comprises a controller, a driving device, a fixed frame, a lifting frame and a moving part, wherein the lifting frame is slidably arranged on the fixed frame, the moving part is fixed on the lifting frame, the driving device drives the lifting frame to lift relative to the fixed frame, the driving device comprises a motor assembly, a flexible cable and a movable pulley fixed on the lifting frame, the motor assembly is fixed on the fixed frame, one end of the flexible cable is wound at the output end of the motor assembly, the other end of the flexible cable extends upwards after passing around the movable pulley and is fixed on the fixed frame, the fixed frame is provided with a first detection element for detecting whether the flexible cable is loosened, and the controller controls the working state of the motor assembly according to a detection signal of the detection element. The electric lifting device can control the motor assembly to rotate through the controller to enable the moving part to move reversely after the first detection element detects that the flexible cable is loosened, so that the purpose of protection is achieved.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to the technical field of electric lifting devices, in particular to an electric lifting device capable of returning back when encountering a resistance.
[ background of the utility model ]
The electric lifting device in the existing market comprises a motor, a screw rod and a nut, wherein the motor is in transmission connection with the screw rod, the screw rod is in threaded connection with the nut, the motor and the screw rod are fixed on an outer cabinet of a hanging cabinet, the nut is fixed on an inner cabinet, the motor drives the screw rod to rotate, the nut can reciprocate along the axial direction of the screw rod, and then the inner cabinet is driven to lift. However, the linear transmission mode of the screw rod nut cannot realize high-speed operation, so that the lifting time of the inner cabinet is prolonged, and the use experience of a user is reduced.
[ Utility model ] content
The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide an electric lifting device which returns when being blocked, the flexible cable is adopted to drive the movable pulley to lift so as to realize the lifting of the movable part, the high-speed operation can be realized, and the lifting time is shortened; in addition, after the first detection element detects that the flexible cable is loosened, the controller controls the motor to rotate so that the movable piece moves reversely, and therefore the purpose of protection is achieved.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a meet and hinder electric lift device who rolls back, includes controller, drive arrangement, mount, slidable mounting be in crane on the mount and fix moving part on the crane, the drive arrangement drive the crane is relative the mount goes up and down, drive arrangement includes motor assembly, flexible cable and fixes movable pulley on the crane, motor assembly fixes on the mount, the one end of flexible cable is convoluteed motor assembly's output, the other end is walked around upwards extend behind the movable pulley and fix on the mount, be equipped with on the mount and be used for detecting whether the first detecting element that the flexible cable loosened, the controller basis detecting element's detection signal control the operating condition of motor assembly.
Further, the first detection element is a microswitch which comprises an elastic contact piece, and the elastic contact piece is pressed when the flexible cable is tensioned.
Further, the first detection element is a force sensor, the force sensor comprises an elastic body and a conversion element, and the elastic body is pressed when the flexible cable is tensioned.
Furthermore, the first detection element comprises a slide rheostat and a spring, the slide rheostat comprises a slide resistor and a slide sheet sliding relative to the slide resistor, two ends of the slide resistor are connected with pins, the spring is arranged between one pin and the slide sheet, and the slide sheet is pressed when the flexible cable is tensioned so that the spring keeps a compressed state.
Further, the flexible cable is a cloth belt.
Further, the crane includes two parallel arrangement and the vertical guide arm that extends, be equipped with on the mount with guide arm sliding fit's slider, mount and crane are all hidden the rear side of moving part.
Furthermore, the lifting frame further comprises an upper connecting rod, the upper connecting rod is connected between the top ends of the two guide rods, a hook is arranged on the upper connecting rod, and the moving part is hung on the hook.
Furthermore, a second detection element for detecting whether the lifting frame touches an obstacle or not is further arranged on the lifting frame, and when the second detection element detects the obstacle, the controller controls the driving device to drive the moving part to move reversely.
Furthermore, the lifting frame further comprises a lower connecting rod, the lower connecting rod is connected between the bottom ends of the two guide rods, and the second detection element is fixed on the lower connecting rod and hidden on the rear side of the movable piece.
Further, the second detection element is one of a six-axis sensor, an acceleration sensor, an angular velocity sensor, and a gyro sensor.
The utility model has the beneficial effects that:
the motor assembly winds the flexible cable, can drive the movable pulley to ascend, and then drives the movable part to ascend through the lifting frame; when the motor assembly loosens the flexible cable, the lifting frame and the moving part drive the movable pulley to descend under the action of gravity, so that the moving part descends; in addition, when the lifting frame descends and meets an obstacle and cannot descend continuously, the flexible cable can be loosened, and at the moment, when the user loosens more, the user controls the motor assembly to move reversely to tighten the flexible cable through the controller, so that the flexible cable is disordered when being wound, namely, the flexible cable is not regularly and irregularly wound, the flexible cable is not stopped or stopped in advance after the stroke is in place, and the flexible cable is abraded and broken to cause accidents under the severe condition, in order to avoid the above situation, the fixing frame of the utility model is provided with a first detection element for detecting whether the flexible cable is loosened, when the first detection element detects that the flexible cable is loosened, a loosening detection signal is sent to the controller, and at the moment, the controller controls the motor assembly to rotate reversely according to the detection signal so as to enable the moving part to ascend, so that the flexible cable is tensioned quickly, and the purpose of protection is achieved.
The first detection element is a microswitch which comprises an elastic contact piece, and the elastic contact piece is pressed when the flexible cable is tensioned. According to the design, when the flexible cable is tensioned, the elastic contact piece is pressed, the first detection element sends a tensioning detection signal to the controller, the controller controls the motor assembly to continue to rotate in the original direction to enable the lifting frame to continue to descend, when the flexible cable is loosened, the pressing force on the elastic contact piece is lost, the first detection element sends a loosening detection signal to the controller, and the controller controls the motor assembly to reversely rotate according to the detection signal to enable the moving part to ascend, so that the flexible cable is rapidly tensioned.
The first detection element is a force sensor, the force sensor comprises an elastic body and a conversion element, and the elastic body is pressed when the flexible cable is tensioned. According to the design, the elastic body is pressed when the flexible cable is tensioned, the first detection element detects pressure and sends a tensioning detection signal to the controller, the controller controls the motor assembly to continue to rotate in the original direction to enable the lifting frame to continue to descend, when the flexible cable is loosened, the pressing on the elastic body is lost, the first detection element detects no pressure and sends a loosening detection signal to the controller, and the controller controls the motor assembly to reversely rotate according to the detection signal to enable the moving part to ascend, so that the flexible cable is rapidly tensioned.
The first detection element comprises a slide rheostat and a spring, the slide rheostat comprises a slide resistor and a slide sheet sliding relative to the slide resistor, two ends of the slide resistor are connected with pins, the spring is arranged between one pin and the slide sheet, and the slide sheet is pressed when the flexible cable is tensioned so that the spring keeps a compressed state. According to the design, when the sliding piece is pressed to enable the spring to be kept in a compressed state when the flexible cable is tensioned, the resistance value of the sliding rheostat is R1, at the moment, the first detection element sends a tensioning detection signal to the controller, the controller controls the motor assembly to continue to rotate in the original direction to enable the lifting frame to continue to descend, when the flexible cable is loosened, the spring resets and drives the sliding piece to move, at the moment, the resistance value of the sliding rheostat is R2, the first detection element sends a loosening detection signal to the controller, at the moment, the controller controls the motor assembly to reversely rotate according to the detection signal to enable the moving piece to ascend, and therefore the flexible cable is rapidly tensioned.
The flexible rope is a cloth belt. Due to the fact that the width of the cloth belt is large, the first detection element can be reliably pressed when the cloth belt is tensioned, and false detection caused by slippage is avoided.
The crane includes two parallel arrangement and the vertical guide arm that extends, is equipped with on the mount with guide arm sliding fit's slider, mount and crane all hide the rear side at the moving part. The lifting stability of the lifting frame can be guaranteed through the matching of the guide rod and the sliding block, and the fixing frame and the lifting frame are hidden at the rear side of the moving part, so that the appearance of a product can be improved.
The lifting frame further comprises an upper connecting rod, the upper connecting rod is connected between the top ends of the two guide rods, the upper connecting rod is provided with a hook, and the moving part is hung on the hook. So design can guarantee the depth of parallelism of two guide arms to this lift stationarity that guarantees the crane can become the installation carrier of moving part again, makes things convenient for the installation of moving part and crane.
The lifting frame is further provided with a second detection element used for detecting whether the lifting frame touches the obstacle, and when the second detection element detects the obstacle, the controller controls the driving device to drive the moving part to move reversely. By the design, a double protection mechanism can be realized, and the purpose that the protection cannot be realized after the first detection element is damaged is avoided.
The crane further comprises a lower connecting rod, the lower connecting rod is connected between the bottom ends of the two guide rods, and the second detection element is fixed on the lower connecting rod and hidden on the rear side of the moving part. So design, lower connecting rod provides the carrier for the installation of second detecting element, makes things convenient for second detecting element's fixed.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The utility model is further described below with reference to the accompanying drawings:
fig. 1 is a structural diagram of an electric lifting device according to a first embodiment of the present invention.
Reference numerals:
1. a controller; 2. a fixed mount; 21. a slider; 3. a lifting frame; 31. a guide bar; 32. an upper connecting rod; 33. hooking; 34. a lower connecting rod; 4. a motor assembly; 41. a motor; 42. a reduction gearbox; 5. a flexible cable; 6. a movable pulley; 7. a first detection element; 8. a second detection element.
[ detailed description ] embodiments
The utility model provides an electric lifting device capable of returning after encountering a resistance, which comprises a controller, a driving device, a fixed frame, a lifting frame and a moving part, wherein the lifting frame is slidably arranged on the fixed frame, the moving part is fixed on the lifting frame, the driving device drives the lifting frame to lift relative to the fixed frame, the driving device comprises a motor assembly, a flexible cable and a movable pulley fixed on the lifting frame, the motor assembly is fixed on the fixed frame, one end of the flexible cable is wound at the output end of the motor assembly, the other end of the flexible cable extends upwards after bypassing the movable pulley and is fixed on the fixed frame, the fixed frame is provided with a first detection element for detecting whether the flexible cable is loosened, and the controller controls the working state of the motor assembly according to a detection signal of the detection element.
The motor assembly winds the flexible cable, can drive the movable pulley to ascend, and then drives the movable part to ascend through the lifting frame; when the motor loosens the flexible cable, the lifting frame and the moving part drive the movable pulley to descend under the action of gravity, so that the moving part descends; in addition, when the lifting frame descends and meets an obstacle and cannot descend continuously, the flexible cable can be loosened, and at the moment, when the user loosens more, the user controls the motor assembly to move reversely to tighten the flexible cable through the controller, so that the flexible cable is disordered when being wound, namely, the flexible cable is not regularly and irregularly wound, the flexible cable is not stopped or stopped in advance after the stroke is in place, and the flexible cable is abraded and broken to cause accidents under the severe condition, in order to avoid the above situation, the fixing frame of the utility model is provided with a first detection element for detecting whether the flexible cable is loosened, when the first detection element detects that the flexible cable is loosened, a loosening detection signal is sent to the controller, and at the moment, the controller controls the motor assembly to rotate reversely according to the detection signal so as to enable the moving part to ascend, so that the flexible cable is tensioned quickly, and the purpose of protection is achieved.
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Example one
Referring to fig. 1, the electric lifting device in this embodiment includes a controller 1, a driving device, a fixing frame 2, a lifting frame 3 slidably mounted on the fixing frame 2, and a moving member fixed on the lifting frame 3, the driving device drives the lifting frame 3 to lift relative to the fixing frame 2, the driving device includes a motor assembly 4, a flexible cable 5, and a movable pulley 6 fixed on the lifting frame 3, the motor assembly 4 is fixed on the fixing frame 2, one end of the flexible cable 5 is wound on an output end of the motor assembly 4, the other end of the flexible cable extends upward after bypassing the movable pulley 6 and is fixed on the fixing frame 2, a first detection element 7 for detecting whether the flexible cable 5 is loosened is arranged on the fixing frame 2, and the controller 1 controls a working state of the motor assembly 4 according to a detection signal of the first detection element 7.
The motor assembly 4 in the embodiment comprises a motor assembly 41 and a reduction gearbox 42, and the flexible cable 5 is wound on a gear of the reduction gearbox, so that the movable pulley 6 can be driven to ascend, the lifting frame 3 is driven to ascend, and the lifting frame 3 drives the movable part to ascend; when the motor assembly 4 loosens the flexible cable 5, the lifting frame 3 and the moving part drive the movable pulley 6 to descend under the action of gravity, so that the moving part descends, in the embodiment, the flexible cable 5 is adopted to drive the movable pulley 6 to ascend and descend so as to realize the ascending and descending of the moving part, the large-speed operation can be realized, and the ascending and descending time is shortened; in addition, when the crane 3 descends and meets an obstacle and cannot descend continuously, the flexible cable 5 is loosened, and at the moment, when the crane is loosened relatively much, the motor assembly 4 is controlled to move reversely to tighten the flexible cable 5, so that confusion occurs during winding, namely irregular random winding is absent, at the moment, the flexible cable 5 is not stopped or stopped in advance after the stroke is in place, and in a severe case, the flexible cable 5 is abraded and broken, and an accident occurs, in order to avoid the above situation, the fixed frame 2 in the embodiment is provided with a first detection element 7 for detecting whether the flexible cable 5 is loosened, when the first detection element 7 detects that the flexible cable 5 is loosened, a loosening detection signal is sent to the controller 1, at the moment, the controller 1 controls the motor assembly 4 to rotate reversely according to the detection signal to enable the movable part to ascend, so as to enable the flexible cable 5 to be tensioned rapidly, so as to achieve the purpose of protection.
The electric lifting device in the embodiment can be suitable for various products, such as a wall cabinet, a television, a dressing table, a white board, a blackboard and the like, when the electric lifting device is used for the wall cabinet, the fixed frame is fixed on a wall body or an outer cabinet, and the movable part is a cabinet body or an inner cabinet matched with the outer cabinet; when the movable part is used for the television, the movable part is the television; when the movable piece is used for the dressing table, the movable piece is the dressing table; when the movable piece is used for the white board, the movable piece is the white board; when the movable piece is used for the blackboard, the movable piece is the blackboard.
The first detection element 7 in this embodiment is a micro switch, the micro switch includes an elastic contact piece, the micro switch is disposed near one end of the flexible cable 5 fixed on the fixing frame 2, the elastic contact piece is pressed when the flexible cable 5 is tensioned, at this time, the first detection element 7 sends a detection signal of tensioning to the controller 1, the controller 1 controls the motor assembly 4 to continue rotating along the original direction so that the lifting frame 3 continues to descend, when the flexible cable 5 is loosened, the pressing force on the elastic contact piece is lost, at this time, the first detection element 7 sends a detection signal of loosening to the controller 1, the controller 1 controls the motor assembly 4 to reversely rotate according to the detection signal so that the lifting frame 3 and the moving part ascend, and further the flexible cable 5 is rapidly tensioned.
The flexible cable 5 in this embodiment can be strap or wire rope, preferred strap because the width of strap is great, consequently can keep reliably pressing to elastic contact piece when the tensioning, avoids taking place the slippage and leads to the false retrieval.
The lifting frame 3 in the embodiment comprises two guide rods 31 which are arranged in parallel and extend vertically, the guide rods 31 are smooth rods, the fixed frame 2 is plate-shaped, two groups of sliding blocks 21 which are respectively in sliding fit with the two guide rods 31 are arranged on the fixed frame 2, and the size of the moving part is larger than that of the lifting frame 3 and the fixed frame 2, so that the fixed frame 2 and the lifting frame 3 can be hidden at the rear side of the moving part when the moving part is lifted, and the appearance of a product is improved; in addition, the lifting stability of the lifting frame 3 can be ensured through the sliding fit of the guide rod 31 and the sliding block 21, and the shaking is avoided.
In addition, in order to fix the movable member on the lifting frame 3, the lifting frame 3 in this embodiment further includes an upper connecting rod 32, the upper connecting rod 32 is connected between the top ends of the two guide rods 31, the upper connecting rod 32 is provided with a hook 33, and the movable member is hung on the hook 33. So design, can guarantee the depth of parallelism of two guide arms 31 through upper connecting rod 32 to this lift stationarity of guaranteeing crane 3 can become the installation carrier of moving part again, makes things convenient for the installation of moving part and crane 3.
It can be understood that in other embodiments of the present invention, the fixed frame and the lifting frame can also be slidably connected through a vertically telescopic sliding rail; or the lifting frame comprises two vertically extending linear guide rails, and the fixed frame is connected with a sliding block in sliding fit with the linear guide rails.
Finally, in order to further improve the protection effect on the driving device, the crane 3 in this embodiment is further provided with a second detection element 8 for detecting whether the crane 3 touches an obstacle, and the second detection element 8 is one of a six-axis sensor, an acceleration sensor, an angular velocity sensor and a gyroscope sensor. When the lifting frame 3 descends and encounters impact or obstruction, the detection data of the second detection element 8 can change, and the controller 1 controls the motor assembly 4 to rotate reversely according to the change of the detection data so as to enable the lifting frame 3 and the moving part to ascend. Use second detecting element 8 as six sensors, when meetting striking or hindering when crane 3 descends, certain small-angle skew can take place for crane 3, the angular deflection that second detecting element 8 also can produce this moment to send controller 1 with the signal of angular deflection, controller 1 is according to the reverse rotation of this signal control motor assembly 4, so that crane 3 and moving part rise. By the design, a double protection mechanism can be realized, and the purpose that the protection cannot be realized after the first detection element 7 is damaged is avoided.
In order to facilitate the installation of the second detection element 8, the crane 3 further includes a lower connecting rod 34 in this embodiment, the lower connecting rod 34 is connected between the bottom ends of the two guide rods 31 to further ensure the parallelism of the two guide rods 31, and further ensure the lifting stability of the crane 3, and the second detection element 8 is fixed on the lower connecting rod 34 and hidden at the rear side of the movable element.
It can be understood that, in other embodiments of the present invention, the fixed mount includes two guide rods extending vertically and arranged in parallel, and an upper connecting rod and a lower connecting rod connected between the two guide rods, the lifting frame includes a bottom plate and two sets of sliding blocks disposed on the left and right sides of the bottom plate, the two sets of sliding blocks are respectively in sliding fit with the two guide rods, and the bottom plate is fixedly connected with the movable member.
It is understood that, in other embodiments of the present invention, the first detecting element is a force sensor, the force sensor includes an elastic body and a converting element, the converting element is connected to the controller, the elastic body is pressed when the flexible cable is tensioned, the first detecting element detects pressure and sends a tensioning detection signal to the controller, the controller controls the motor assembly to continue rotating in the original direction to enable the lifting frame to continue to descend, when the flexible cable is loosened, the pressing on the elastic body is lost, the first detecting element detects no pressure and sends a loosening detection signal to the controller, and the controller controls the motor assembly to rotate in the reverse direction according to the detection signal to enable the movable member to ascend, so as to enable the flexible cable to be tensioned quickly.
It is understood that in other embodiments of the present invention, the first detecting element includes a sliding rheostat and a spring, the sliding rheostat includes a sliding resistor and a sliding sheet sliding relative to the sliding resistor, two ends of the sliding resistor are connected with pins, a spring is disposed between one of the pins and the sliding sheet, when the flexible cable is tensioned, the sliding sheet is pressed to make the sliding sheet rest on the sliding resistor and compress the spring, so that the spring keeps a compressed state, at this time, a resistance value of the sliding rheostat is R1, the first detecting element sends a tensioning detection signal to the controller, the controller controls the motor assembly to continue to rotate in an original direction to make the lifting frame continue to descend, when the lifting frame is descended, the flexible cable is loosened when encountering an impact or an obstruction, at this time, the spring resets and drives the sliding sheet to move, a resistance value of the sliding rheostat is R2, the first detecting element sends a loosening detection signal to the controller, at this time, the controller controls the motor assembly to rotate reversely to ascend the moving member according to the detection signal, thereby enabling the flexible cable to be tensioned rapidly.
While the utility model has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the utility model is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the utility model as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. The utility model provides a meet and hinder electric lift device who rolls back, includes controller, drive arrangement, mount, slidable mounting be in crane on the mount and fix moving part on the crane, the drive arrangement drive the crane is relative the mount goes up and down, a serial communication port, drive arrangement includes motor assembly, flexible cable and fixes movable pulley on the crane, motor assembly fixes on the mount, the one end of flexible cable is convoluteed in motor assembly's output, the other end is walked around upwards extend behind the movable pulley and fix on the mount, be equipped with on the mount and be used for detecting whether first detecting element that the flexible cable unclamped, the controller basis detecting element's detection signal control the operating condition of motor assembly.
2. A resistive retracting power lifter as claimed in claim 1, wherein the first sensing element is a micro switch, the micro switch includes a resilient contact, and the flexible cable presses the resilient contact when tensioned.
3. A resistive retracting power lifter according to claim 1, wherein the first sensing member is a force sensor, the force sensor includes an elastic body and a switching member, and the flexible cable presses the elastic body when tensioned.
4. A resistive retracting electrical lift device as claimed in claim 1 wherein said first sensing element comprises a slide rheostat and a spring, said slide rheostat comprising a slide resistor and a slide plate sliding relative to said slide resistor, said slide resistor having pins connected to both ends thereof, said spring being disposed between one of said pins and said slide plate, said flexible cable pressing said slide plate when tensioned to maintain said spring in a compressed state.
5. A fail-back motorized lift device, according to claim 1, wherein said flexible cord is a cloth tape.
6. An electric lifting device as claimed in any one of claims 1 to 5, wherein the lifting frame comprises two guide rods arranged in parallel and extending vertically, the fixed frame is provided with a slide block in sliding fit with the guide rods, and the fixed frame and the lifting frame are both hidden behind the movable member.
7. The electric lifting device capable of retracting after being blocked as claimed in claim 6, wherein the lifting frame further comprises an upper connecting rod, the upper connecting rod is connected between the top ends of the two guide rods, the upper connecting rod is provided with a hook, and the movable member is hung on the hook.
8. The electric lifting device capable of retracting after encountering a blockage of claim 6, wherein the lifting frame is further provided with a second detection element for detecting whether the lifting frame touches a barrier, and when the second detection element detects the barrier, the controller controls the driving device to drive the movable member to move reversely.
9. The electric lifting device capable of retracting after being blocked as claimed in claim 8, wherein the lifting frame further comprises a lower connecting rod, the lower connecting rod is connected between the bottom ends of the two guide rods, and the second detection element is fixed on the lower connecting rod and hidden behind the movable member.
10. A motorized lift device for retracting upon encountering a blockage according to claim 8 wherein said second sensing element is one of a six-axis sensor, an acceleration sensor, an angular velocity sensor and a gyroscopic sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121975769.7U CN216303137U (en) | 2021-08-20 | 2021-08-20 | Electric lifting device capable of returning back when meeting resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121975769.7U CN216303137U (en) | 2021-08-20 | 2021-08-20 | Electric lifting device capable of returning back when meeting resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216303137U true CN216303137U (en) | 2022-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121975769.7U Active CN216303137U (en) | 2021-08-20 | 2021-08-20 | Electric lifting device capable of returning back when meeting resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216303137U (en) |
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2021
- 2021-08-20 CN CN202121975769.7U patent/CN216303137U/en active Active
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