Linear lifting device

Abstract

The utility model discloses a linear lifting device which comprises a driving assembly, a lifting assembly and a lifting assembly. The screw rod is driven to rotate by the power provided by the motor; the tubular telescopic assembly is driven by the rotating motion of the lead screw to do linear telescopic motion; the linear lifting device further comprises a bearing element which is axially positioned on the screw rod; the detection plate is fixed on the driving assembly and comprises a first plate body and a second plate body, the first plate body and the second plate body are arranged in a split mode and can respectively deform, a resistance meeting sensor is arranged on the first plate body and / or the second plate body, and the resistance meeting sensor is configured to sense deformation of the corresponding plate body to generate an electric signal; and the bearing element is enclosed and fixed by the first plate body and the second plate body and can transmit the axial force of the screw rod to the first plate body and the second plate body. According to the linear lifting device, the structure of the detection plate is changed, so that the cost of the whole process can be effectively reduced, and the manufacturing cost of the linear lifting device is reduced.

Description

[Technical field]

[0001] The utility model relates to the technical field of linear lifting devices, in particular to a linear lifting device. [Background technology]

[0002] Linear lifting devices are generally used in electric lifting mechanisms with lifting functions such as lifting tables and lifting beds. Electric lifting mechanisms usually include a platform and a linear lifting device for driving the platform to lift and lower. If an obstacle is encountered during the platform lifting process, the linear lifting device will continue to drive the platform to lift and lower, and the platform will contact the obstacle and generate an interaction force. The force will be transmitted to the linear lifting device through the platform. If the linear lifting device does not stop immediately, the platform or the linear lifting device will be damaged due to the obstacle; if the obstacle is a human body, it will cause harm to the human body.

[0003] To this end, the existing linear lifting device is provided with an resistance detection plate and a resistance sensor arranged on the resistance detection plate. The linear lifting device includes a screw and a bearing element axially positioned on the screw, and the bearing element is fixed on the resistance detection plate. When encountering an obstacle during the platform lifting process, the screw will transmit the axial force applied to it to the resistance detection plate through the bearing element, causing the resistance detection plate to deform. After detecting the deformation stress, the resistance sensor transmits a signal to the controller of the electric lifting mechanism, which controls the linear lifting device to stop moving according to the signal to respond to the resistance.

[0004] The existing resistance detection plate is an integrally formed metal part, and the resistance detection plate and the bearing element are assembled by riveting or pressing. This places high requirements on the size of the parts and the processing equipment, resulting in a high overall process cost, thereby increasing the manufacturing cost of the linear lifting device. [Utility Model Content]

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a linear lifting device, which can effectively reduce the cost of the overall process by changing the structure of the detection plate, thereby reducing the manufacturing cost of the linear lifting device.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A linear lifting device, comprising:

[0008] A drive assembly, wherein the drive assembly has a motor built therein;

[0009] A screw rod, driven to rotate by power provided by the motor;

[0010] The tubular telescopic assembly is driven by the rotational movement of the screw rod to perform linear telescopic movement;

[0011] The linear lifting device also includes:

[0012] a bearing element axially positioned on the screw; and

[0013] The detection plate fixed on the driving assembly includes a first plate body and a second plate body, the first plate body and the second plate body are separately arranged and can respectively produce deformation, the first plate body and / or the second plate body are provided with a resistance sensor, the resistance sensor is configured to sense the corresponding plate body deformation and generate an electrical signal, the bearing element is enclosed and fixed by the first plate body and the second plate body and can transmit the axial force of the screw to both.

[0014] In the above-mentioned linear lifting device, a first through hole for the screw rod to pass through is provided on the first plate body, a second through hole for the screw rod to pass through is provided on the second plate body, the resistance sensor is arranged on the first plate body and close to the first through hole, and / or the resistance sensor is arranged on the second plate body and close to the second through hole.

[0015] In the above-mentioned linear lifting device, a mounting groove is provided on the second plate body, the bottom wall of the mounting groove is provided with the second through hole, the bearing element is located in the mounting groove, and one end of the bearing element abuts against the bottom wall of the mounting groove, and the other end abuts against the first plate body.

[0016] In the above linear lifting device, the resistance sensor is provided on the second plate body, a receiving gap is provided between the first plate body and the second plate body, and the resistance sensor provided on the second plate body is at least partially located in the receiving gap.

[0017] In the above linear lifting device, a groove is provided on the surface of the second plate body facing the first plate body, and the accommodation gap is formed between the bottom surface of the groove and the first plate body.

[0018] In the above linear lifting device, the driving assembly includes a housing for accommodating the motor, the first plate and the second plate are fixed to the housing by fasteners, and both ends of the bearing element are respectively against the first plate and the second plate.

[0019] In the above linear lifting device, the fastener passes through the first plate body and the second plate body and is fixedly connected to the shell.

[0020] In the above linear lifting device, a plurality of limiting ribs are provided on the second plate body, and the plurality of limiting ribs surround the outer side of the first plate body to position the first plate body.

[0021] In the above linear lifting device, the driving assembly includes a housing, the motor is accommodated in the housing, a boss is provided on the housing, and the second plate is supported on the boss and fixed between the first plate and the boss.

[0022] In the above-mentioned linear lifting device, the two ends of the first plate body protrude outward to form a first mounting portion, and the two ends of the second plate body protrude outward to form a second mounting portion. The widths of the first mounting portion and the second mounting portion gradually decrease along their protruding directions, and the first mounting portion and the second mounting portion are both fixedly connected to the shell.

[0023] Beneficial effects of the utility model:

[0024] 1. The detection plate in the utility model includes a first plate body and a second plate body, the first plate body and the second plate body are separately arranged and can each produce deformation, and an encounter sensor is arranged on the first plate body and / or the second plate body, and the encounter sensor is configured to sense the corresponding plate body deformation and generate an electrical signal, and the bearing element is enclosed and fixed by the first plate body and the second plate body and can transmit the axial force of the screw rod to the two. The first plate body and the second plate body are separately arranged, which can not only reduce the processing difficulty of the two, but also fix the bearing element by enclosing the first plate body and the second plate body formed separately, and there is no need for the detection plate to be designed as an integral molding, thereby eliminating the existing riveting or press riveting process of the detection plate, thereby reducing the cost of the overall process, and further reducing the manufacturing cost of the linear lifting device; in addition, by arranging an encounter sensor on the first plate body and / or the second plate body, and making the first plate body and the second plate body can each produce deformation, it is possible to realize unidirectional encounter detection of the linear lifting device or bidirectional encounter detection of lifting and lowering, so as to avoid the linear lifting device being damaged by obstacles.

[0025] 2. The first plate body is provided with a first through hole for the screw rod to pass through, the second plate body is provided with a second through hole for the screw rod to pass through, the resistance sensor is provided on the first plate body and is arranged close to the first through hole, and / or the resistance sensor is provided on the second plate body and is arranged close to the second through hole. Since the rigidity of the portion of the first plate body located around the first through hole and the portion of the second plate body located around the second through hole is relatively weak, the portion of the first plate body located around the first through hole and the portion of the second plate body located around the second through hole are more likely to deform, that is, after the first plate body and / or the second plate body are subjected to the axial force transmitted by the bearing element, the portion of the first plate body located around the first through hole and the portion of the second plate body located around the second through hole are the areas with the largest deformation on the entire plate body, so arranging the resistance sensor close to the through hole can make the stress value acting on the resistance sensor rise faster, which can not only improve the sensitivity of the resistance detection, but also enable the resistance sensor to respond quickly.

[0026] 3. The second plate body is provided with a mounting groove, the bottom wall of the mounting groove is provided with a second through hole, the bearing element is located in the mounting groove, and one end of the bearing element abuts against the bottom wall of the mounting groove, and the other end abuts against the first plate body. With such a design, the bearing element can be placed in the mounting groove first, so that the mounting groove can pre-position the bearing element, and then the first plate body and the second plate body can be enclosed to fix the bearing element, thereby reducing the difficulty of assembling the bearing element, and also improving the connection reliability of the bearing element and the detection board.

[0027] 4. An obstruction sensor is provided on the second plate, and a receiving gap is provided between the first plate and the second plate, and the obstruction sensor provided on the second plate is at least partially located in the receiving gap. With such a design, the receiving gap can provide installation space for the obstruction sensor on the second plate, that is, the size of the second plate does not need to be set too large to provide installation space for the obstruction sensor to avoid the first plate, thereby reducing the size of the second plate; in addition, the structure can be made more compact.

[0028] 5. A groove is provided on the surface of the second plate body facing the first plate body, and a receiving gap is formed between the bottom surface of the groove and the first plate body. With such a design, the thickness of the portion of the second plate body corresponding to the groove can be reduced, so that the portion of the second plate body corresponding to the groove is easier to deform. Since the resistance sensor on the second plate body is arranged in the groove, the stress value acting on the resistance sensor can increase faster, further improving the sensitivity of resistance detection, so that the resistance sensor can respond quickly.

[0029] 6. The drive assembly includes a housing for accommodating the motor, the first plate and the second plate are fixed to the housing by fasteners, and the two ends of the bearing element are respectively against the first plate and the second plate. Such a design can not only improve the connection reliability between the first plate and the second plate and the housing, thereby improving the fixing reliability of the bearing element, but also reduce the difficulty of assembling the first plate and the second plate and the housing.

[0030] 7. The fastener passes through the first plate and the second plate and is fixedly connected to the shell. With this design, the first plate and the second plate can be fixedly connected to the shell at the same time by the fastener, without the need for the first plate and the second plate to be fixedly connected to the shell by the fastener, thereby reducing the number of fasteners used and saving the assembly steps of the detection board and the shell.

[0031] 8. The second plate is provided with a plurality of limiting convex ribs, which surround the outer side of the first plate to position the first plate. With such a design, the first plate can be positioned by the plurality of limiting convex ribs to ensure that the positions of the first plate and the second plate for the fasteners to penetrate correspond to each other, thereby facilitating the subsequent fasteners to smoothly penetrate the first plate and the second plate and then be fixedly connected to the shell.

[0032] 9. The drive assembly includes a housing, the motor is accommodated in the housing, a boss is provided on the housing, and the second plate is supported on the boss and fixed between the first plate and the boss. With this design, an escape gap can be formed between the second plate and the wall of the housing with a through hole, so as to provide an escape space for the subsequent deformation of the second plate; in addition, the design of the boss can also reduce the contact area between the second plate and the wall of the housing, reduce the supporting performance of the wall of the housing on the second plate, weaken the stiffness strengthening effect on the second plate, and make the second plate more prone to deformation.

[0033] 10. Both ends of the first plate body are convex to form a first mounting portion, and both ends of the second plate body are convex to form a second mounting portion. The widths of the first mounting portion and the second mounting portion gradually decrease along the protruding direction thereof, and the first mounting portion and the second mounting portion are fixedly connected to the housing. Such a design can not only reduce the material cost of the first plate body and the second plate body, but also reduce the rigidity strengthening effect of the mounting portion on the plate body where it is located, so that the first plate body and the second plate body are more easily deformed.

[0034] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings.

Brief Description of the Drawings

[0035] The utility model is further described below in conjunction with the accompanying drawings:

[0036] Figure 1 This is a schematic diagram of the structure of the linear lifting device in the first embodiment of the utility model;

[0037] Figure 2 It is a cross-sectional view of the linear lifting device in the first embodiment of the utility model;

[0038] Figure 3 It is a partial explosion schematic diagram after removing the bottom plate of the driving assembly in the first embodiment of the utility model;

[0039] Figure 4 This is an exploded schematic diagram of the detection plate, the bearing element, the resistance sensor and the screw rod in the first embodiment of the utility model;

[0040] Figure 5 This is a schematic diagram of the structure of the second plate in the first embodiment of the utility model;

[0041] Figure 6 This is an assembly cross-sectional view of the detection plate, the bearing element, the resistance sensor and the screw rod in the first embodiment of the utility model;

[0042] Figure 7 It is an assembly cross-sectional view of the detection plate, bearing element, resistance sensor, screw rod and part of the housing in the first embodiment of the utility model.

[0043] Reference numerals:

[0044] 100, drive assembly; 110, motor; 120, housing; 121, bottom box; 1210, through hole; 1211, boss; 122, bottom plate; 130, reduction box; 200, screw rod; 210, retaining spring; 300, tubular telescopic assembly; 310, inner tube; 320, middle tube; 330, outer tube; 400, bearing element; 410, inner ring; 420, outer ring; 500, detection plate; 510, first plate body; 511, first through hole; 512, first mounting portion; 520, second plate body; 521, second through hole; 522, limiting rib; 523, mounting groove; 524, groove; 525, second mounting portion; 530, accommodation gap; 600, resistance sensor; 700, fastener; 800, shock-absorbing pad. [Specific implementation method]

[0045] The utility model provides a linear lifting device, comprising:

[0046] A drive assembly, wherein the drive assembly has a motor built therein;

[0047] A screw rod, driven to rotate by power provided by the motor;

[0048] The tubular telescopic assembly is driven by the rotational movement of the screw rod to perform linear telescopic movement;

[0049] The linear lifting device also includes:

[0050] a bearing element axially positioned on the screw; and

[0051] The detection plate fixed on the driving assembly includes a first plate body and a second plate body, the first plate body and the second plate body are separately arranged and can each produce deformation, the first plate body and / or the second plate body are provided with an encounter sensor, the encounter sensor is configured to sense the corresponding plate body deformation and generate an electrical signal, and the bearing element is enclosed and fixed by the first plate body and the second plate body and can transmit the axial force of the screw rod to the two. The separate arrangement of the first plate body and the second plate body in the utility model can not only reduce the processing difficulty of the two, but also fix the bearing element by enclosing the first plate body and the second plate body formed separately, without the need for an integrated molding design of the detection plate, thereby canceling the existing riveting or press riveting process of the detection plate, thereby reducing the cost of the overall process, and further reducing the manufacturing cost of the linear lifting device; in addition, by providing an encounter sensor on the first plate body and / or the second plate body, and making the first plate body and the second plate body can each produce deformation, it is possible to realize unidirectional encounter detection of the linear lifting device or bidirectional encounter detection of lifting and lowering, so as to avoid the linear lifting device being damaged by obstacles.

[0052] The technical scheme of the embodiment of the utility model is explained and illustrated below in conjunction with the drawings of the embodiment of the utility model, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without making creative work all belong to the protection scope of the utility model. In addition, it should be understood that the following words indicating orientation or position relationship such as "up", "down", "left", "right", "longitudinal", "lateral", "inside", "outside", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0053] Embodiment 1

[0054] like Figures 1 to 7 As shown, the linear lifting device of this embodiment includes a driving assembly 100, a screw rod 200 and a tubular telescopic assembly 300, wherein the driving assembly 100 has a built-in motor 110, the screw rod 200 is driven to rotate by the power provided by the motor 110, and the tubular telescopic assembly 300 is driven by the rotational movement of the screw rod 200 to perform linear telescopic movement, and the tubular telescopic assembly 300 includes an inner tube 310, a middle tube 320 and an outer tube 330 which are sequentially arranged from the inside to the outside, and its specific structure can refer to the prior art and will not be described in detail here. In addition, the linear lifting device in this embodiment also includes a bearing element 400 and a detection plate 500 fixed on the drive assembly 100. The bearing element 400 is axially positioned on the screw 200. The detection plate 500 includes a first plate body 510 and a second plate body 520. The first plate body 510 and the second plate body 520 are separately arranged and can each produce deformation. The first plate body 510 and the second plate body 520 are both provided with a resistance sensor 600. The resistance sensor 600 can be a piezoelectric element or a strain gauge, so that the resistance sensor 600 is configured to sense the corresponding plate deformation and generate an electrical signal. The bearing element 400 is enclosed and fixed by the first plate body 510 and the second plate body 520 and can transmit the axial force of the screw to the two. In this embodiment, the first plate body 510 and the second plate body 520 are separately arranged, which can not only reduce the processing difficulty of both, but also can fix the bearing element 400 by enclosing the separately formed first plate body 510 and the second plate body 520, without the need for an integrally formed design of the detection plate 500, thereby eliminating the existing riveting or press riveting process of the detection plate 500, thereby reducing the cost of the overall process and further reducing the manufacturing cost of the linear lifting device; in addition, by providing an resistance sensor 600 on the first plate body 510 and the second plate body 520, and allowing the first plate body 510 and the second plate body 520 to deform separately, it is possible to realize bidirectional resistance detection of the linear lifting device to avoid damage to the linear lifting device due to obstacles during lifting.

[0055] Specifically, in this embodiment, the screw rod 200 includes a shoulder surface and a groove, and a retaining spring 210 is provided in the groove. The bearing element 400 includes an inner ring 410 and an outer ring 420. The two end surfaces of the inner ring 410 are respectively against the shoulder surface and the retaining spring 210, so as to achieve axial limitation of the bearing element 400 through the cooperation of the shoulder surface and the retaining spring 210, thereby axially positioning the bearing element 400 on the screw rod 200, and the drive assembly 100 also includes a shell 120, and the shell 120 accommodates a motor 110 and a reduction box 130. The output end of the motor 110 is connected to the reduction box 130, and the first plate body 510 and the second plate body 520 are fixedly installed in the shell 120. After one end of the screw rod 200 extends into the shell 120, it passes through the first plate body 510 and the second plate body 520 and is connected to the reduction box 130, so that the motor 110 drives the screw rod 200 to rotate through the reduction box 130.

[0056] like Figure 1 and Figure 7 As shown, the shell 120 in this embodiment includes a bottom box 121 and a bottom plate 122, and the bottom box 121 and the bottom plate 122 cooperate to form a cavity for accommodating the motor 110 and the reduction box 130, and a through hole 1210 is provided on the bottom wall of the bottom box 121 for the screw rod 200 to pass through, and the first plate body 510 and the second plate body 520 are both fixedly connected to the bottom wall of the bottom box 121, wherein the first plate body 510 is provided with a first through hole 511 for the screw rod 200 to pass through, and the second plate body 520 is provided with a second through hole 521 for the screw rod 200 to pass through, and the two end faces of the outer ring 420 of the bearing element 400 are respectively abutted against the first plate body 510 and the second plate body 520, so as to realize that the first plate body 510 and the second plate body 520 enclose and fix the bearing element 400.

[0057] Preferably, the first plate 510 and the second plate 520 in this embodiment are fixed to the bottom wall of the bottom box 121 by fasteners 700. Such a design can improve the connection reliability between the first plate 510 and the second plate 520 and the bottom wall of the bottom box, so as to improve the fixing reliability of the bearing element 400, and can reduce the difficulty of assembling the first plate 510 and the second plate 520 and the bottom box 121. The fasteners 700 in this embodiment are preferably screws. Such a design can realize the detachable connection between the first plate 510 and the second plate 520 and the bottom wall of the bottom box, so as to facilitate the subsequent replacement of the first plate 510 and the second plate 520 separately.

[0058] It is understandable that in other embodiments of the present invention, the fasteners may also be rivets, and the rivets are used to directly fix the first plate body and the second plate body to the bottom box through a rivet gun.

[0059] In order to facilitate the assembly of the first plate body 510 and the second plate body 520 with the bottom wall of the bottom box 121, the fastener 700 in this embodiment passes through the first plate body 510 and the second plate body 520 and is threadedly connected to the bottom wall of the bottom box 121. With this design, the first plate body 510 and the second plate body 520 can be fixed at the same time by the fixed connection between the fastener 700 and the bottom wall of the bottom box 121. There is no need for the first plate body 510 and the second plate body 520 to be fixedly connected to the bottom wall of the bottom box 121 respectively by the fastener 700, thereby reducing the number of fasteners 700 used and saving the assembly steps of the detection plate 500 and the shell 120.

[0060] In order to facilitate the alignment of the holes on the first plate body 510 and the second plate body 520 through which the fasteners 700 pass, in this embodiment, a plurality of limiting ribs 522 are provided on the second plate body 520. The plurality of limiting ribs 522 surround the outer side of the first plate body 510 to position the first plate body 510 to prevent the first plate body 510 from moving relative to the second plate body 520 along the radial direction of the screw rod 200, thereby facilitating the rapid alignment of the holes on the first plate body 510 and the second plate body 520 through which the fasteners 700 pass, thereby facilitating the subsequent fasteners 700 to smoothly pass through the first plate body 510 and the second plate body 520 and then be fixedly connected to the bottom wall of the bottom box 121.

[0061] In order to realize that the first plate 510 and the second plate 520 enclose and fix the bearing element 400, the second plate 520 in this embodiment is provided with a mounting groove 523 which is recessed in a direction away from the first plate 510, and the bottom wall of the mounting groove 523 is provided with the second through hole 521, and the bearing element 400 is located in the mounting groove 523, one end of the outer ring 420 is supported on the bottom wall of the mounting groove 523, and the other end of the outer ring 420 is against the first plate 510. With such a design, the bearing element 400 can be placed in the mounting groove 523 first, so that the mounting groove 523 can pre-position the bearing element 400, and then the first plate 510 and the second plate 520 can be fixed on the bottom wall of the bottom box 121 by the fastener 700 to enclose and fix the bearing element 400, thereby reducing the difficulty of assembling the bearing element 400, and also improving the connection reliability between the bearing element 400 and the detection board 500.

[0062] In order to improve the detection sensitivity of the two resistance sensors 600, in this embodiment, the resistance sensor 600 disposed on the first plate 510 is disposed close to the first through hole 511, and the resistance sensor 600 disposed on the second plate 520 is disposed close to the second through hole 521. Since the portion of the first plate 510 located around the first through hole 511 and the portion of the second plate 520 located around the second through hole 521 are relatively weak in rigidity, the portion of the first plate 510 located around the first through hole 511 and the portion of the second plate 520 located around the second through hole 521 are relatively weak in rigidity. That is, after the first plate body 510 and the second plate body 520 are subjected to the axial force transmitted by the bearing element 400, the portion of the first plate body 510 located around the first through hole 511 and the portion of the second plate body 520 located around the second through hole 521 are the areas with the largest deformation on the entire plate body. Therefore, arranging the resistance sensor 600 close to the through hole can make the stress value acting on the resistance sensor 600 increase faster, which can not only improve the sensitivity of resistance detection, but also enable the resistance sensor 600 to respond quickly.

[0063] Preferably, the resistance sensor 600 disposed on the first plate 510 is bonded to a side of the first plate 510 away from the second plate 520, that is, located on the top surface of the first plate 510. Such a design can provide a larger installation space for the resistance sensor 600, so as to reduce the difficulty of assembling the resistance sensor 600 disposed on the first plate 510. The resistance sensor 600 disposed on the second plate 520 is located on a side of the second plate 520 close to the first plate 510. Preferably, a receiving gap 530 is provided between the first plate 510 and the second plate 520, and the resistance sensor 600 disposed on the second plate 520 is at least partially located in the receiving gap 530. In this embodiment, the size of the second plate 520 is preferably slightly larger than that of the first plate 510, and part of the resistance sensor 600 is located in the receiving gap 530, and the remaining part of the resistance sensor 600 is located in the part of the second plate 520 outside the projection of the first plate 510 on the second plate 520. With such a design, the accommodating gap 530 can provide installation space for the resistance sensor 600 disposed on the second plate body 520, that is, there is no need to set the size of the second plate body 520 too large to provide installation space for the resistance sensor 600 to avoid the first plate body 510, thereby reducing the size of the second plate body 520; in addition, the structure can be made more compact.

[0064] In order to form the above-mentioned accommodation gap 530, in this embodiment, the surface portion of the second plate 520 facing the first plate 510 is cut to form a groove 524, and the accommodation gap 530 is formed between the bottom surface of the groove 524 and the first plate 510. Such a design can reduce the thickness of the portion of the second plate 520 corresponding to the groove 524, so that the portion of the second plate 520 corresponding to the groove 524 is more easily deformed. Since the resistance sensor 600 on the second plate 520 is bonded and fixed in the groove 524, the stress value acting on the resistance sensor 600 can be increased faster, further improving the sensitivity of resistance detection, so that the resistance sensor can respond quickly.

[0065] It can be understood that in other embodiments of the present invention, a recessed groove is formed by cutting a surface portion of the first plate body facing the second plate body, and a receiving gap is formed between the bottom surface of the recessed groove and the second plate body.

[0066] In addition, in the present embodiment, the two ends of the first plate body 510 protrude outward to form a first mounting portion 512, and the two ends of the second plate body 520 protrude outward to form a second mounting portion 525. The width of the first mounting portion 512 gradually decreases along its protruding direction, and the width of the second mounting portion 525 gradually decreases along its protruding direction. The cross-sectional shape of the first plate body 510 is similar to the cross-sectional shape of the second plate body 520. The fastener 700 passes through the first mounting portion 512 and the second mounting portion 525 and is fixedly connected to the bottom wall of the bottom box 121. Such a design can not only reduce the material cost of the first plate body 510 and the second plate body 520, but also reduce the rigidity strengthening effect of the mounting portion on the plate body where it is located, so that the first plate body 510 and the second plate body 520 are easier to deform.

[0067] It should be noted that, in the case where a first mounting portion 512 and a second mounting portion 525 are provided, the limiting rib 522 is provided on the second mounting portion 525. Preferably, two limiting ribs 522 are provided on the surface of each second mounting portion 525, wherein one limiting rib 522 is parallel to an oblique side surface of the second mounting portion 525, and the other limiting rib 522 is parallel to the other oblique side surface of the second mounting portion 525. With such a design, the first plate body 510 can be positioned by four limiting ribs 522, thereby reducing the number of limiting ribs 522, thereby reducing the difficulty of processing the second plate body 520.

[0068] Finally, in this embodiment, a boss 1211 is further provided on the inner side surface of the bottom wall of the bottom box 121, and the boss 1211 supports the second mounting portion 525. The second mounting portion 525 is located between the first mounting portion 512 and the boss 1211. The fastener 700 passes through the first mounting portion 512 and the second mounting portion 525 and is fixedly connected to the boss 1211. Such a design can form an avoidance gap between the second plate body 520 and the bottom wall of the bottom box 121 to provide an avoidance space for the subsequent deformation of the second plate body 520; in addition, the design of the boss 1211 can also reduce the contact area between the second plate body 520 and the bottom wall of the bottom box 121, reduce the supporting performance of the bottom wall of the bottom box 121 on the second plate body 520, weaken the stiffness strengthening effect on the second plate body 520, and make the second plate body 520 more susceptible to deformation. Preferably, a shock-absorbing pad 800 is further provided between the boss 1211 and the second mounting portion 525 , and the shock-absorbing pad 800 can reduce the vibration transmission between the boss 1211 and the second mounting portion 525 .

[0069] When the linear lifting device in this embodiment rises steadily, the resistance sensor 600 attached to the first plate 510 receives a stable force and monitors it. When the linear lifting device suddenly encounters resistance, the bearing element 400 applies an axial force to the first plate 510 to deform the first plate 510. At this time, the resistance sensor 600 arranged on the first plate 510 senses the deformation of the first plate 510 and generates an electrical signal, and transmits the deformed electrical signal to the controller. The controller controls the motor 110 to rotate in the opposite direction. At this time, the linear lifting device descends to achieve Function of retreating when encountering resistance; similarly, when the linear lifting device descends steadily, the resistance sensor 600 attached to the second plate 520 receives a stable force and monitors it. When the linear lifting device suddenly encounters resistance, an axial force is applied to the second plate 520 through the bearing element 400 to cause the second plate 520 to deform. At this time, the resistance sensor 600 arranged on the second plate 520 senses the deformation of the second plate 520 and generates an electrical signal, and transmits the deformed electrical signal to the controller. The controller controls the motor 110 to rotate in the opposite direction, and the linear lifting device rises.

[0070] It can be understood that, in other embodiments of the present invention, the resistance sensor disposed on the second plate body may also be disposed on a side of the second plate body that is away from the first plate body.

[0071] It can be understood that in other embodiments of the present invention, the first plate body and the second plate body are respectively fixed to the bottom wall of the bottom box by fasteners.

[0072] It can be understood that in other embodiments of the present invention, without considering the size of the second plate body, the overall size of the second plate body is larger than the overall size of the first plate body, and an resistance sensor is arranged on the portion of the second plate body located outside the projection of the second plate body to provide sufficient installation space for the resistance sensor.

[0073] It is understandable that in other embodiments of the present invention, one side of the first plate body facing the second plate body is recessed to form a mounting groove, the bearing element is located in the mounting groove, and both ends of the bearing element are respectively against the bottom wall of the mounting groove and the second plate body.

[0074] It can be understood that in other embodiments of the present invention, on the basis of providing an accommodation gap between the first plate body and the second plate body, the resistance sensor provided on the first plate body can also be at least partially located in the accommodation gap.

[0075] Embodiment 2

[0076] Compared with the first embodiment, the difference of this embodiment is that: the first plate body is provided with a resistance sensor, while the second plate body is not provided with a resistance sensor. At this time, the six-axis sensor can be used to detect resistance during descent to realize bidirectional resistance detection for lifting and lowering. For details, please refer to CN207115083U, which will not be described in detail here.

[0077] Embodiment 3

[0078] Compared with the first embodiment, the difference of this embodiment is that: the second plate body is provided with a resistance sensor, while the first plate body is not provided with a resistance sensor. At this time, the six-axis sensor can be used to detect resistance during ascent to realize bidirectional resistance detection for ascent and descent. For details, please refer to CN207115083U, which will not be described in detail here.

[0079] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. A linear lifting device, comprising: A drive assembly, wherein the drive assembly has a motor built therein; A screw rod, driven to rotate by power provided by the motor; The tubular telescopic assembly is driven by the rotational movement of the screw rod to perform linear telescopic movement; Characterized in that the linear lifting device also includes: a bearing element axially positioned on the screw; and The detection plate fixed on the driving assembly includes a first plate body and a second plate body, the first plate body and the second plate body are separately arranged and can respectively produce deformation, the first plate body and / or the second plate body are provided with a resistance sensor, the resistance sensor is configured to sense the corresponding plate body deformation and generate an electrical signal, the bearing element is enclosed and fixed by the first plate body and the second plate body and can transmit the axial force of the screw to both.

2. A linear lifting device according to claim 1, characterized in that: The first plate body is provided with a first through hole for the screw rod to pass through, the second plate body is provided with a second through hole for the screw rod to pass through, the resistance sensor is arranged on the first plate body and close to the first through hole, and / or the resistance sensor is arranged on the second plate body and close to the second through hole.

3. A linear lifting device as claimed in claim 2, characterized in that: The second plate body is provided with a mounting groove, the bottom wall of the mounting groove is provided with the second through hole, the bearing element is located in the mounting groove, and one end of the bearing element abuts against the bottom wall of the mounting groove, and the other end abuts against the first plate body.

4. A linear lifting device according to claim 1, characterized in that: The second plate body is provided with the resistance sensor, a receiving gap is provided between the first plate body and the second plate body, and the resistance sensor provided on the second plate body is at least partially located in the receiving gap.

5. A linear lifting device as claimed in claim 4, characterized in that: A groove is provided on the surface of the second plate body facing the first plate body, and the accommodation gap is formed between the bottom surface of the groove and the first plate body.

6. A linear lifting device according to any one of claims 1 to 5, characterized in that: The driving assembly includes a housing for accommodating the motor, the first plate body and the second plate body are fixed to the housing by fasteners, and two ends of the bearing element are respectively against the first plate body and the second plate body.

7. A linear lifting device according to claim 6, characterized in that: The fastener passes through the first plate body and the second plate body and is fixedly connected to the shell.

8. A linear lifting device as claimed in claim 7, characterized in that: The second plate body is provided with a plurality of limiting convex ribs, and the plurality of limiting convex ribs surround the outer side of the first plate body to position the first plate body.

9. A linear lifting device according to any one of claims 1 to 5, characterized in that: The driving assembly comprises a shell, the motor is accommodated in the shell, a boss is provided on the shell, and the second plate body is supported on the boss and fixed between the first plate body and the boss.

10. A linear lifting device according to any one of claims 1 to 5, characterized in that: The two ends of the first plate body protrude outward to form a first mounting portion, and the two ends of the second plate body protrude outward to form a second mounting portion. The widths of the first mounting portion and the second mounting portion gradually decrease along their protruding directions, and the first mounting portion and the second mounting portion are both fixedly connected to the shell.

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