Weight-limiting automatic clutch device and electric lifting table

Abstract

The utility model discloses a weight-limiting automatic clutch device and an electric lifting table, and belongs to the technical field of furniture equipment, the weight-limiting automatic clutch device comprises a driving disc in transmission connection with a driving motor, and the driving disc is provided with at least one clamping groove in the circumferential direction; the retainer is in transmission connection with the transmission rod, at least one clamping piece corresponding to the clamping groove is connected to the retainer, and the clamping piece can move in the axial direction of the retainer so as to be clamped into or separated from the clamping groove; the retainer is connected with an elastic piece, and when the torque between the driving disc and the retainer is smaller than or equal to the set torque, the clamping piece is clamped into the clamping groove, and the driving disc drives the retainer to rotate synchronously; and when the torque between the driving disc and the retainer is larger than the set torque, the clamping pieces are extruded to axially move to be separated from the clamping grooves, and the driving disc rotates relative to the retainer. The electric lifting table adopts the weight-limiting automatic clutch device. The weight-limiting automatic clutch device can limit the weight of the load, and overload operation of the driving motor is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of office furniture, and in particular to a weight-limited automatic clutch device and an electric lifting table. Background Art

[0002] An electric lift table is an office desk with adjustable height, which can be adjusted according to a person's height, sitting posture, or standing posture. An electric lift table generally uses a motor as a power source to drive the lifting. The electric lift table of the related technology has a structure including a table top assembly, a base, and a lifting column connecting the table top assembly and the base to drive the height of the table top assembly relative to the base; the driving motor is installed under the table top assembly to drive the lifting column to rise and fall. Among them, a dual-motor electric lift table has a driving motor connected to the upper end of each lifting column, while a single-motor electric lift table uses a driving motor to drive the transmission rod to rotate, so that the two ends of the transmission rod drive the two lifting columns to rise and fall.

[0003] The electric lift table of the related technology has some shortcomings in actual use: the electric lift table is calibrated with a rated load when leaving the factory, and the electric lift table can be safely lifted and lowered when the load does not exceed the rated load; once the load of the electric lift table exceeds the rated load, the electric lift table can still maintain the lifting operation, but the torque output by the drive motor will increase and it will be in an overloaded state, which will also generate loud noise and even cause the software control program to falsely report the defect; and when the drive motor is overloaded for a long time, it is easy to burn out the motor or internal wires, increasing maintenance costs. Utility Model Content

[0004] The technical problem to be solved by the present application is to overcome the defects of the above-mentioned related technologies and provide a weight-limiting automatic clutch device which can limit the load and avoid overload operation of the drive motor.

[0005] The technical solution of the present application is to provide a weight-limited automatic clutch device having the following structure:

[0006] A driving disc drivingly connected to the driving motor, wherein the driving disc is provided with at least one slot along the circumferential direction;

[0007] A retainer connected to the transmission rod, the retainer is coaxially arranged with the driving disk, the retainer is connected to at least one clamp corresponding to the clamping slot, and the clamp can move along the axial direction of the retainer to be clamped into or out of the clamping slot; the retainer is connected to an elastic member for making the clamp always have a movement tendency to be clamped into the clamping slot;

[0008] When the torque between the driving disk and the retaining frame is less than or equal to the set torque, the clamping member is clamped into the clamping slot and the driving disk drives the retaining frame to rotate synchronously; and

[0009] When the torque between the driving disk and the retaining frame is greater than a set torque, the clamping member is squeezed and can axially move out of the clamping slot, and the driving disk rotates relative to the retaining frame.

[0010] In some embodiments, an axially movable adjusting nut is threadedly connected to the retaining frame, and the adjusting nut is connected to the elastic member to adjust the compression amount of the elastic member.

[0011] In some embodiments, a base is provided at one end of the retaining frame close to the driving disk, and the base has at least one axially extending through hole distributed along the circumferential direction. The clamping member is gap-fitted in the through hole, and the first end of the clamping member is at least partially inserted into the slot, and the second end of the clamping member is against the elastic member.

[0012] In some embodiments, the driving disk is provided with a plurality of slots along the circumferential direction, and the base is provided with a plurality of through holes distributed along the circumferential direction, and the through holes are provided with the clamping members corresponding to the slots; a pressure plate is provided on the sliding sleeve of the retaining frame, and one end of the pressure plate is connected to the elastic member, and the other end of the pressure plate is abutted against the second end of each of the clamping members.

[0013] In some embodiments, the base is provided with at least one guide piece extending axially and in a direction away from the driving disk, and the pressure plate is provided with a notch matched with the guide piece, and the guide piece gap fits in the notch.

[0014] In some embodiments, the adjacent side walls of two adjacent slots are smoothly transitioned.

[0015] In some embodiments, the weight-limited automatic clutch device also includes a mounting seat, the retaining frame is rotatably connected within the mounting seat, and the drive disk is rotatably connected to the retaining frame, and the center of the retaining frame is provided with a polygonal hole that is compatible with the cross-section of the transmission rod.

[0016] In some embodiments, the drive motor is connected to the mounting seat, the axis of the output shaft of the drive motor is parallel to the axis of the transmission rod, and the drive motor and the retaining frame are both located on the same side of the mounting seat; a transmission gear is coaxially connected to the drive disk, and a drive gear is installed on the output shaft of the drive motor, and the drive gear is transmission-connected to the transmission gear.

[0017] In summary, compared with the related art, the weight-limiting automatic clutch device of the present application has the following advantages: a card slot is arranged on a driving disk that is transmission-connected to a driving motor, and a card piece that can be inserted into or disengaged from the card slot is arranged on a retaining frame that is transmission-connected to a driving rod, and the card piece is pressed by an elastic member; the driving disk transmits torque to the retaining frame through the cooperation of the card piece and the card slot, and when the torque between the driving disk and the retaining frame is less than or equal to the set torque, the driving disk drives the retaining frame to rotate synchronously, and when the torque between the driving disk and the retaining frame is greater than the set torque, the card piece compresses the elastic member to move axially and can disengage. The slot allows the drive disc to rotate relative to the holder; the set torque is the rotational torque of the holder or the transmission rod under the rated load. Therefore, in the case of overload, the transmission torque between the drive disc and the holder will inevitably be greater than the set torque. In this case, the clamp is squeezed by the slot of the drive disc and overcomes the elastic force of the elastic member to move axially away from the slot and disengage from the slot, so that the drive disc idles and the holder remains stationary, which can effectively prevent the drive motor from overloading and prevent the motor or internal wires from burning; therefore, the weight-limiting automatic clutch device can limit the load to prevent the drive motor from overloading. Furthermore, the weight-limiting automatic clutch device is a purely mechanical structure with a low cost.

[0018] Another technical solution of the present application is to provide an electric lifting table with the following structure, including a table top, a base, a driving motor and two lifting columns connecting the table top and the base and used to adjust the height of the table top relative to the base, a transmission rod is transmission-connected between the two lifting columns, the driving motor is transmission-connected to the transmission rod, and an automatic weight-limiting clutch device as described in any of the above embodiments is connected between the driving motor and the transmission rod.

[0019] Therefore, compared with the related art, the electric lifting table of the present application has the following advantages: because an automatic weight-limiting clutch device is provided between the driving motor and the transmission rod, when the load of the electric lifting table exceeds its rated load, the clamping member of the automatic weight-limiting clutch device is squeezed by the clamping slot of the driving disk and overcomes the elastic force of the elastic member to move axially in the direction away from the clamping slot and disengage from the clamping slot, so that the driving motor drives the driving disk to idle while the retaining frame remains stationary, and the table top stops lifting and lowering, which can effectively prevent the driving motor from overloading and prevent the motor or internal wires from burning. Therefore, the electric lifting table can limit the load and prevent the driving motor from overloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a weight-limited automatic clutch device according to some embodiments of the present application.

[0021] Figure 2 It is a schematic diagram of the internal structure of a weight-limited automatic clutch device according to some embodiments of the present application.

[0022] Figure 3 It is a schematic cross-sectional structural diagram of a weight-limited automatic clutch device according to some embodiments of the present application.

[0023] Figure 4 It is a schematic diagram of the assembly structure of a weight-limited automatic clutch device according to some embodiments of the present application.

[0024] Figure 5 It is a schematic diagram of the structure of an electric lifting table according to some embodiments of the present application.

[0025] Description of reference numerals:

[0026] 1. Driving motor, 100. Driving gear, 101. Gear transmission assembly, 2. Transmission rod, 3. Weight-limited automatic clutch device, 300. Mounting seat, 301. Driving disk, 302. Slot, 303. Retaining frame, 304. Base, 305. Through hole, 306. Card, 307. Pressure plate, 308. Elastic part, 309. Adjusting nut, 310. Bearing, 311. Driving gear, 312. Polygonal hole, 313. Guide plate, 314. Notch, 4. Table top, 5. Base, 6. Lifting column. DETAILED DESCRIPTION

[0027] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0028] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0029] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] See also Figure 1 to Figure 4 As shown;

[0032] The embodiment of the present application discloses a weight-limited automatic clutch device, which comprises a mounting seat 300, a driving disc 301 mounted in the mounting seat 300, and a retaining frame 303, wherein the driving disc 301 is transmission-connected with the driving motor 1, the retaining frame 303 is transmission-connected with the transmission rod 2, and the retaining frame 303 is rotatably connected in the mounting seat 300 through a bearing 310, the driving disc 301 and the retaining frame 303 are coaxially arranged, and the driving disc 301 is rotatably connected to the retaining frame 303; wherein a polygonal hole 312 matching the cross section of the transmission rod 2 is provided at the center of the retaining frame 303, and the transmission rod 2 can be inserted into the retaining frame 303 through the polygonal hole 312 to realize synchronous rotation of the two; the driving disc 301 is transmission-connected with the driving motor 1, specifically in the present embodiment, the driving motor 1 is connected to the mounting seat 300, and a transmission gear 311 is coaxially connected to the driving disc 301, and a driving gear 100 is installed on the output shaft of the driving motor 1, and the driving gear 100 is transmission-connected with the transmission gear 311.

[0033] It can be understood that the transmission connection between the driving gear 100 and the transmission gear 311 can be a direct transmission connection, or it can be a transmission connection through a gear transmission component 101, such as through multiple gear meshing transmission; in other embodiments, the driving motor 1 can also drive the driving disk 301 to rotate through a transmission component such as a worm gear, a belt, etc.

[0034] In this embodiment, if Figure 1 , Figure 2 and Figure 3 As shown, the driving disk 301 is provided with at least one slot 302 along the circumferential direction, and the retaining frame 303 is connected with at least one clamping piece 306 corresponding to the slot 302, and the clamping piece 306 can move along the axial direction of the retaining frame 303 to be clamped into or out of the slot 302; further, an elastic piece 308 is connected to the retaining frame 303, and the elastic piece 308 is used to make the clamping piece 306 always have a movement tendency to be clamped into the slot 302; in this embodiment, the driving disk 301 can transmit the torque to the retaining frame 303 through the clamping piece 306, and when the driving motor 1 drives the driving disk 301 to rotate, the torque of the driving motor 1 is transmitted to the driving disk 301, and the driving disk 301 can transmit the torque to the transmission rod 2 through the clamping piece 306 and the retaining frame 303.

[0035] In the above embodiment, the torque of the transmission rod 2 or the retaining frame 303 rotating under the rated load is also called the rated load torque or the set torque. When the torque between the driving disk 301 and the retaining frame 303 is less than or equal to the set torque, the clamping member 306 is clamped into the clamping slot 302 and the driving disk 301 drives the retaining frame 303 to rotate synchronously; and when the torque between the driving disk 301 and the retaining frame 303 is greater than the set torque, the clamping member 306 is squeezed and can move axially out of the clamping slot 302, and the driving disk 301 rotates relative to the retaining frame 303. Therefore, in this embodiment, the drive disc 301 transmits the torque to the holder 303 through the cooperation of the clamp 306 and the slot 302. In the case of overload, the transmission torque between the drive disc 301 and the holder 303 is bound to be greater than the set torque. In this case, the clamp 306 is squeezed by the slot 302 of the drive disc 301 and overcomes the elastic force of the elastic member 308 to move axially away from the slot 302 and disengage from the slot 302, so that the drive disc 301 idles and the holder 303 remains stationary, which can effectively prevent the drive motor 1 from overloading and burning the motor or internal wires; therefore, the weight-limiting automatic clutch device 3 can limit the load to prevent the drive motor 1 from overloading. Furthermore, the weight-limiting automatic clutch device 3 is a purely mechanical structure with a low cost.

[0036] It is not difficult to understand that the greater the elastic force of the elastic member 308 on the clamping member 306, the greater the maximum value of the torque transmitted between the driving disk 301 and the retaining frame 303. Therefore, the maximum value of the torque transmitted between the driving disk 301 and the retaining frame 303 can be set by adjusting the elastic force of the elastic member 308, that is, the maximum value of the torque between the driving disk 301 and the retaining frame 303 can be set to the torque value of the transmission rod 2 or the retaining frame 303 rotating under the rated load. Specifically in this embodiment, see Figure 3 and Figure 4 As shown, an axially movable adjusting nut 309 is threadedly connected to the retaining frame 303, and the adjusting nut 309 is connected to the elastic member 308 for adjusting the compression amount of the elastic member 308, thereby adjusting the pressure of the clamping member 306 acting on the clamping slot 302, so as to adjust the maximum value of the torque transmitted between the driving disk 301 and the retaining frame 303.

[0037] For example, the user can turn the adjusting nut 309 according to the rotational torque of the transmission rod 2 or the retaining frame 303 under the rated load, and adjust the compression amount of the elastic member 308, so as to adjust the maximum value of the torque transmitted between the driving disk 301 and the retaining frame 303 to the rotational torque of the transmission rod 2 or the retaining frame 303 under the rated load or the set torque described above.

[0038] In the embodiments of the present application, Figure 2 and Figure 4As shown, the retainer 303 is arranged in a multi-section cylindrical shape, and a base 304 is provided at one end of the retainer 303 close to the driving disk 301. The retainer 303 on both sides of the base 304 is arranged as two mounting sections, one mounting section is for rotationally connecting the driving disk 301, and the other mounting section is sleeved with an elastic member 308, and a threaded section is provided on the mounting section, and an adjusting nut 309 is threadedly connected to the threaded section; the base 304 is circumferentially provided with at least one axially extending through hole 305, and the clamping member 306 is loosely fitted in the through hole 305, and the first end of the clamping member 306 is at least partially clamped into the clamping slot 302, the second end of the clamping member 306 is against the elastic member 308, and the tail end of the elastic member 308 is against the adjusting nut 309. The compression amount of the elastic member 308 can be adjusted by rotating the adjusting nut 309, so that the pressing force between the clamping member 306 and the clamping slot 302 can be adjusted.

[0039] In this embodiment, each clamping member 306 is a steel ball or two steel balls arranged side by side. In other embodiments, the clamping member 306 may also be a cylindrical clamping pin with hemispherical ends.

[0040] Further in this embodiment, in order to smoothly transmit the torque of the driving disk 301 to the retaining frame 303 and increase the maximum value of the torque transmitted between the two, as shown in FIG. Figure 3 and Figure 4 As shown, the driving disk 301 is provided with a plurality of slots 302 along the circumferential direction, and the base 304 is provided with a plurality of through holes 305 distributed along the circumferential direction, and the through holes 305 are provided with clips 306 corresponding to the slots 302; further, a pressing plate 307 is slidably sleeved on the retaining frame 303, and one end of the pressing plate 307 is connected to the elastic member 308, and the other end of the pressing plate 307 abuts against the second end of each clip 306. The pressing plate 307 can simultaneously apply elastic force to all the clips 306 under the elastic force of the elastic member 308, so that the clips 306 are clipped into the slots 302.

[0041] In the process of adjusting the compression amount of the elastic member 308 to adjust the pressure of the clamp 306, in order to make the axial movement of the pressing plate 307 more stable and prevent the pressing plate 307 from shaking or tilting on one side or unevenly applying force, as shown in FIG. Figure 4 As shown, at least one guide piece 313 extending axially and away from the driving disc 301 is provided on the base 304, and a notch 314 matching the guide piece 313 is provided on the pressure plate 307, and the guide piece 313 is loosely fitted in the notch 314. For example, two guide pieces 313 are provided on the base 304, and two notches 314 matching and plugging with the two guide pieces 313 are provided on the pressure plate 307.

[0042] For example Figure 4As shown, in order to prevent the clamping member 306 from being unable to smoothly disengage from the clamping slot 302 when the torque between the driving disc 301 and the retaining frame 303 is greater than the set torque, the adjacent two side walls of the two adjacent clamping slots 302 are smoothly transitioned. In this way, when the torque between the driving disc 301 and the retaining frame 303 is greater than the set torque, the clamping member 306 can smoothly disengage from the clamping slot 302, so that the torque transmission between the driving disc 301 and the retaining frame 303 is disconnected.

[0043] In some embodiments, Figure 1 , Figure 2 and Figure 3 As shown, the axis of the output shaft of the driving motor 1 is parallel to the axis of the transmission rod 2, and the driving motor 1 and the retaining frame 303 are both located on the same side of the mounting seat 300; such an arrangement not only saves space, but also makes the structure between the driving motor 1 and the weight-limiting automatic clutch device 3 more compact.

[0044] See also Figure 5 As shown; another embodiment of the present application discloses an electric lifting table, comprising a table top 4, a base 5, a driving motor 1, and two lifting columns 6 connecting the table top 4 and the base 5 and used to adjust the height of the table top 4 relative to the base 5, a transmission rod 2 is connected between the two lifting columns 6, the driving motor 1 is connected to the transmission rod 2, and a weight-limiting automatic clutch device 3 as in any of the above embodiments is connected between the driving motor 1 and the transmission rod 2. Because the weight-limiting automatic clutch device 3 is arranged between the driving motor 1 and the transmission rod 2, when the load of the electric lifting table exceeds its rated load, the clamping member 306 of the weight-limiting automatic clutch device 3 is squeezed by the clamping groove 302 of the driving disk 301 and overcomes the elastic force of the elastic member 308 to move axially in a direction away from the clamping groove 302 and disengage from the clamping groove 302, so that the driving motor 1 drives the driving disk 301 to idle while the retaining frame 303 remains stationary, and the table top 4 stops lifting, which can effectively avoid the driving motor 1 from overloading and preventing the motor or internal wires from burning. Therefore, the electric lifting table can limit the load and avoid the driving motor 1 from overloading.

[0045] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0046] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A weight-limited automatic clutch device, characterized in that: include A driving disc drivingly connected to the driving motor, wherein the driving disc is provided with at least one slot along the circumferential direction; A retainer connected to the transmission rod, the retainer is coaxially arranged with the driving disk, the retainer is connected to at least one clamp corresponding to the clamping slot, and the clamp can move along the axial direction of the retainer to be clamped into or out of the clamping slot; the retainer is connected to an elastic member for making the clamp always have a movement tendency to be clamped into the clamping slot; When the torque between the driving disk and the retaining frame is less than or equal to the set torque, the clamping member is clamped into the clamping slot and the driving disk drives the retaining frame to rotate synchronously; and When the torque between the driving disk and the retaining frame is greater than a set torque, the clamping member is squeezed and can axially move out of the clamping slot, and the driving disk rotates relative to the retaining frame.

2. The weight-limited automatic clutch device according to claim 1, characterized in that: An adjusting nut capable of axial movement is threadedly connected to the retaining frame, and the adjusting nut is connected to the elastic member for adjusting the compression amount of the elastic member.

3. The weight-limited automatic clutch device according to claim 2, characterized in that: A base is provided at one end of the retaining frame close to the driving disk, and the base has at least one axially extending through hole distributed along the circumferential direction. The clamping member is loosely fitted in the through hole, and the first end of the clamping member is at least partially inserted into the slot, and the second end of the clamping member is against the elastic member.

4. The weight-limited automatic clutch device according to claim 3, characterized in that: The driving disk is provided with a plurality of slots along the circumferential direction, and the base is provided with a plurality of through holes distributed along the circumferential direction, and the through holes are provided with the clamping members corresponding to the slots; a pressure plate is provided on the sliding sleeve of the retaining frame, and one end of the pressure plate is connected to the elastic member, and the other end of the pressure plate is abutted against the second end of each of the clamping members.

5. The weight-limited automatic clutch device according to claim 4, characterized in that: The base is provided with at least one guide piece extending axially and in a direction away from the driving disk, and the pressure plate is provided with a notch matched with the guide piece, and the guide piece gap is fitted in the notch.

6. The weight-limited automatic clutch device according to any one of claims 1 to 5, characterized in that: The adjacent two side walls of the two adjacent slots are smoothly transitioned.

7. The weight-limited automatic clutch device according to claim 1, characterized in that: The weight-limited automatic clutch device also includes a mounting seat, the retaining frame is rotatably connected in the mounting seat, and the driving plate is rotatably connected to the retaining frame, and the center of the retaining frame is provided with a polygonal hole that matches the cross section of the transmission rod.

8. The weight-limited automatic clutch device according to claim 7, characterized in that: The drive motor is connected to the mounting seat, the axis of the output shaft of the drive motor is parallel to the axis of the transmission rod, and the drive motor and the retaining frame are both located on the same side of the mounting seat; a transmission gear is coaxially connected to the drive disk, and a drive gear is installed on the output shaft of the drive motor, and the drive gear is in transmission connection with the transmission gear.

9. An electric lifting table, comprising a table top, a base, a driving motor, and two lifting columns connecting the table top and the base and used to adjust the height of the table top relative to the base, a driving rod being drivingly connected between the two lifting columns, and the driving motor being drivingly connected to the driving rod, characterized in that: A weight-limited automatic clutch device as described in any one of claims 1 to 8 is connected between the drive motor and the transmission rod.

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