A screw rod, a lifting mechanism, and a luggage case

Abstract

The present invention provides a screw rod, a lifting mechanism, and a luggage case. The screw rod includes a screw rod main body portion extending along the axial direction of the screw rod. The screw rod main body portion includes an inner cavity, track portions symmetrically arranged on the outer periphery of the inner cavity, an external thread provided on the outer periphery of the track portions, and sliding grooves formed between adjacent two track portions along the circumferential direction of the screw rod main body portion. The track portions are adapted to the sliding grooves. When the screw rod is used in the lifting mechanism, the track portions of one screw rod cooperate with the sliding grooves of another screw rod to achieve sliding fit and engagement between the two screw rods. The sliding fit between the two screw rods provides a space for the lifting movement of the lifting mechanism, and the engagement between the two screw rods provides a track for the lifting movement of the lifting component in the lifting mechanism, so that the lifting mechanism combines the functions of lifting and track, and improves the function of the lifting mechanism.

Description

Technical Field

[0001] The present invention relates to a screw.

[0002] The present invention further relates to a lifting mechanism including the above screw.

[0003] The present invention further relates to a luggage case including the above lifting mechanism. Background Art

[0004] In some devices, there are lifting components that move up and down, and the height of the device changes. It is necessary to wait until the height of the device rises to a certain level before allowing the lifting components to move up and down inside the device. For example, in a smart portable cleaning and ironing luggage case disclosed in a Chinese invention patent application with the application number 201910221256.8, it has an inner box body, an outer box body, a box body lifting mechanism, a cleaning machine lifting mechanism, and a cleaning mechanism. The inner box body and the outer box body are connected by the box body lifting mechanism. Thus, the inner box body can move up and down relative to the outer box body, causing the height of the luggage case to change. After the inner box body rises to a preset height, the cleaning mechanism moves up and down under the action of the cleaning machine lifting mechanism along an inner box upper guide rail provided on the inner wall of the inner box body and an outer box lower guide rail provided on the inner wall of the outer box body. Further, in the above smart portable cleaning and ironing luggage case, the box body lifting mechanism is composed of two screws with threaded cooperation, and one of the screws is driven by a motor to rotate. For the above smart portable cleaning and ironing luggage case, the two screws with threaded cooperation only play a role in lifting, and an additional set of track mechanisms (i.e., the inner box upper guide rail and the outer box lower guide rail) need to be configured for the cleaning mechanism to move up and down, which increases the cost and also occupies the internal space of the luggage case. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a screw that, when used in a lifting mechanism, simultaneously functions as a lifting component and a track.

[0006] To achieve the above purpose, the present invention provides a screw, including a screw main body portion extending along the axial direction of the screw. The screw main body portion includes an inner cavity, track portions symmetrically arranged on the outer periphery of the inner cavity, external threads provided on the outer periphery of the track portions, and sliding grooves formed circumferentially along the screw main body portion between adjacent two track portions. The track portions are adapted to the sliding grooves.

[0007] Further, the screw further includes a connecting portion and a biting portion. The connecting portion and the biting portion are respectively connected to both ends of the track portion. The biting portion is adapted to the sliding groove; the outer periphery of the biting portion is a smooth surface or is provided with external threads.

[0008] Further, both the track portions and the sliding grooves are two in number.

[0009] Furthermore, the screw rod is an integrally formed part.

[0010] As described above, the screw rod involved in the present invention has the following beneficial effects:

[0011] When the above screw rod is used in a lifting mechanism, the track part of one screw rod cooperates with the sliding groove of another screw rod to achieve sliding fit and engagement between the two screw rods. The sliding fit of the two screw rods provides a space for the lifting movement of the lifting mechanism, and the engagement of the two screw rods provides a track for the lifting component to move up and down in the lifting mechanism, so that the lifting mechanism combines the functions of lifting and track, improving the function of the lifting mechanism.

[0012] Another object of the present invention is to provide a lifting mechanism that simultaneously has the functions of lifting and track.

[0013] To achieve the above object, the present invention provides a lifting mechanism, including an upper screw rod and a lower screw rod that can be engaged, an inner screw rod, a transmission block threadedly engaged with the inner screw rod, a first driving source for driving the inner screw rod to rotate, a second driving source for driving the upper screw rod or the lower screw rod to rotate, and a lifting driving component for connecting with a lifting component; both the upper screw rod and the lower screw rod are the screw rods described in any one of claims 1-4. The track part of the upper screw rod is located in the sliding groove of the lower screw rod and the two are in sliding fit, and the track part of the lower screw rod is located in the sliding groove of the upper screw rod and the two are in sliding fit; the inner screw rod is rotatably installed in the inner cavity of one of the two screw rods of the upper screw rod and the lower screw rod, and the transmission block is fixed in the inner cavity of the other of the two screw rods of the upper screw rod and the lower screw rod; the lifting driving component is threadedly engaged with the track part of the upper screw rod or the lower screw rod; after the upper screw rod and the lower screw rod are engaged, the external thread on the track part of the upper screw rod is connected to the external thread on the track part of the lower screw rod.

[0014] Furthermore, the lifting mechanism further includes a speed regulation driving source installed on the lifting component, and a speed regulation transmission component connected between the speed regulation driving source and the lifting driving component. The speed regulation driving source drives the lifting driving component to rotate through the speed regulation transmission component, and the lifting driving component is rotatably installed in the lifting component.

[0015] Furthermore, the speed regulation driving source is a motor, and the speed regulation transmission component includes a driving gear fixed on the output shaft of the speed regulation driving source and a driven gear fixed on the outer periphery of the lifting driving component, and the driving gear and the driven gear are engaged with each other.

[0016] Furthermore, both the first driving source and the second driving source are motors.

[0017] Further, the lifting mechanism further includes two sets of support and guiding components. The two sets of support and guiding components, the connected upper screw rod and the lower screw rod are distributed in a triangle; each set of support and guiding components includes an upper support rod and a lower support rod parallel to the upper screw rod and the lower screw rod, and a guiding block for being fixed to the lifting component. The upper support rod and the lower support rod are sleeved and slidably matched with each other, and the guiding block is connected to the upper support rod or the lower support rod through a linear bearing.

[0018] As described above, the lifting mechanism involved in the present invention has the following beneficial effects:

[0019] In the above-mentioned lifting mechanism, when the first driving source drives the inner screw rod to rotate, the upper screw rod or the lower screw rod can be lifted through the thread fit between the inner screw rod and the transmission block, realizing the lifting function of the lifting mechanism; when the upper screw rod and the lower screw rod reach the preset position, the upper screw rod and the lower screw rod are engaged, and the second driving source drives the upper screw rod or the lower screw rod to rotate. Through the thread fit between the lifting driving component and the track part of the upper screw rod or the lower screw rod, the lifting driving component can move up and down along the upper screw rod and the lower screw rod, and then drive the lifting component to move up and down together. At this time, the upper screw rod and the lower screw rod play the role of a track, realizing the track function of the lifting mechanism. Therefore, the lifting mechanism in the present application has both a lifting function and a track function. Compared with the prior art, it integrates two sets of mechanisms in the prior art into one, with a compact and reasonable structure, and can reduce the internal space it occupies.

[0020] Another object of the present invention is to provide a luggage case, which can realize the lifting of the inner box body and the lifting of the cleaning mechanism by using a set of lifting mechanisms.

[0021] To achieve the above object, the present invention provides a luggage case, including an inner box body, an outer box body, a cleaning mechanism, and the above-mentioned lifting mechanism. The upper end of the upper screw rod is rotatably installed in the top plate of the inner box body, and the lower end of the lower screw rod is rotatably installed in the bottom plate of the outer box body. The cleaning mechanism in the luggage case constitutes a lifting component and is connected to the lifting driving component in the lifting mechanism.

[0022] As described above, the luggage case involved in the present invention has the following beneficial effects:

[0023] In this luggage case, through a set of lifting mechanisms, the inner box body can move up and down relative to the outer box body, and the cleaning mechanism can move up and down along the upper screw rod and the lower screw rod. Its structure is compact and reasonable, the cost is low, and it can reduce the internal space occupied by the lifting mechanism in the box body, relatively expanding the effective space inside the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 and Figure 2 are schematic structural diagrams of the lifting mechanism in the present application from different perspectives.

[0025] Figure 3 This is the connection structure diagram among the upper screw rod, lower screw rod, speed regulation drive source, speed regulation transmission component, and lifting drive component in this application.

[0026] Figure 4 This is the schematic structural diagram of the upper screw rod in this application.

[0027] Figure 5 This is the schematic structural diagram of the lower screw rod in this application.

[0028] Element number description

[0029] 10 Screw rod

[0030] 11 Screw rod main body part

[0031] 111 Inner cavity

[0032] 112 Track part

[0033] 113 External thread

[0034] 114 Sliding groove

[0035] 12 Connection part

[0036] 13 Engaging part

[0037] 20 Upper screw rod

[0038] 30 Lower screw rod

[0039] 40 Inner lead screw

[0040] 50 Transmission block

[0041] 60 First drive source

[0042] 70 Second drive source

[0043] 80 Lifting component

[0044] 90 Lifting drive component

[0045] 110 Speed regulation drive source

[0046] 120 Driving gear

[0047] 130 Driven gear

[0048] 140 Upper support rod

[0049] 150 Lower support rod

[0050] 160 Guide block

[0051] 170 Linear bearing

[0052] 180 Inner box body

[0053] 181 Top plate

[0054] 190 Outer box body

[0055] 191 Bottom plate

[0056] 200 Cleaning mechanism Specific implementation manners

[0057] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0058] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of description and are not used to limit the scope for the implementation of the present invention. Any change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present invention.

[0059] In this application, a screw 10 and a lifting mechanism installed with the screw 10 are provided. For the convenience of description, the axial direction of the screw 10 is defined as the up and down direction.

[0060] As Figures 1 to 3 shown, the lifting mechanism involved in this application includes an upper screw 20, a lower screw 30, an inner lead screw 40, a transmission block 50, a first driving source 60, a second driving source 70, and a lifting driving component 90. The upper screw 20, the lower screw 30, and the inner lead screw 40 are arranged in parallel and all extend up and down. As Figure 4 and Figure 5 shown, both the upper screw 20 and the lower screw 30 include a screw main body portion 11 extending up and down. The screw main body portion 11 includes an inner cavity 111, track portions 112 symmetrically arranged on the outer periphery of the inner cavity 111, an external thread 113 provided on the outer periphery of the track portions 112, and sliding grooves 114 formed between adjacent two track portions 112 along the circumferential direction of the screw main body portion 11. The track portions 112 are adapted to the sliding grooves 114. In the lifting mechanism, as Figure 1 and Figure 2As shown, the track portions 112 of the upper screw 20 and the lower screw 30 are arranged out of phase circumferentially, such that the track portion 112 of the upper screw 20 is located in the sliding groove 114 of the lower screw 30 and the two are in sliding fit, and the track portion 112 of the lower screw 30 is located in the sliding groove 114 of the upper screw 20 and the two are in sliding fit. Therefore, the lower end of the upper screw 20 is connected to the upper end of the lower screw 30, and the upper screw 20 and the lower screw 30 are also in sliding fit. The inner lead screw 40 is rotatably installed in the inner cavity 111 of one of the two screws, namely the upper screw 20 and the lower screw 30, and the transmission block 50 is fixed in the inner cavity 111 of the other screw of the upper screw 20 and the lower screw 30. The inner lead screw 40 passes through the transmission block 50 and is in threaded fit with the transmission block 50. The output end of the first drive source 60 is connected to the inner lead screw 40 to drive the inner lead screw 40 to rotate; the output end of the second drive source 70 is connected to the upper screw 20 or the lower screw 30 to drive the upper screw 20 or the lower screw 30 to rotate. The lifting drive member 90 is in threaded fit with the track portion 112 of the upper screw 20 or the lower screw 30, and the lifting drive member 90 is used to connect to the lifting member 80.

[0061] As Figure 1 and Figure 2 shown, the lifting mechanism is used to be installed between two components to realize the lifting movement between the two components. For the convenience of description, the two components are respectively defined as the top plate 181 and the bottom plate 191. The top plate 181 and the bottom plate 191 are arranged axially up and down along the axis after the upper screw 20 and the lower screw 30 are connected. The upper screw 20 is rotatably installed in the top plate 181 through a bearing, and the lower screw 30 is rotatably installed in the bottom plate 191 through a bearing.

[0062] Furthermore, in this embodiment, as Figure 1 and Figure 2As shown, the inner screw rod 40 is rotatably installed in the inner cavity 111 of the upper screw rod 20, and the transmission block 50 is fixed in the inner cavity 111 of the lower screw rod 30. The output end of the second driving source 70 is connected to the lower screw rod 30 to drive the lower screw rod 30 to rotate. Of course, in other embodiments, the inner screw rod 40 is rotatably installed in the inner cavity 111 of the lower screw rod 30, the transmission block 50 is fixed in the inner cavity 111 of the upper screw rod 20; the output end of the second driving source 70 is connected to the upper screw rod 20 to drive the upper screw rod 20 to rotate. Taking the case where the inner screw rod 40 is rotatably installed in the inner cavity 111 of the upper screw rod 20, the transmission block 50 is fixed in the inner cavity 111 of the lower screw rod 30, and the second driving source 70 drives the lower screw rod 30 to rotate as an example, the working principle of the above lifting mechanism is as follows: First, the first driving source 60 drives the inner screw rod 40 to rotate. The inner screw rod 40 is in threaded cooperation with the transmission block 50, and the transmission block 50 is fixed in the lower screw rod 30. Therefore, while rotating, the inner screw rod 40 will move up or down. The inner screw rod 40 drives the upper screw rod 20 to move up or down together, realizing the lifting function of the lifting mechanism; when the upper screw rod 20 rises to a preset position, the lower end of the upper screw rod 20 and the upper end of the lower screw rod 30 are engaged. At this time, the external thread 113 on the track portion 112 of the upper screw rod 20 is connected to the external thread 113 on the track portion 112 of the lower screw rod 30; then, the second driving source 70 drives the lower screw rod 30 to rotate. Through the engagement between the upper screw rod 20 and the lower screw rod 30, the lower screw rod 30 drives the upper screw rod 20 to rotate together. The lifting driving member 90 is in threaded cooperation with the track portion 112 of the upper screw rod 20 or the lower screw rod 30. Therefore, while the upper screw rod 20 and the lower screw rod 30 rotate together, the lifting driving member 90 will move up or down along the upper screw rod 20 and the lower screw rod 30. The lifting driving member 90 drives the lifting member 80 to move up or down together. The upper screw rod 20 and the lower screw rod 30 play a role of providing a track for the lifting movement of the lifting member 80, realizing the track function of the lifting mechanism. Therefore, the lifting mechanism in the present application has both a lifting function and a track function. Compared with the prior art, it integrates two sets of mechanisms in the prior art, has a compact and reasonable structure, and can reduce the internal space it occupies.

[0063] Furthermore, in the lifting mechanism involved in the present application, the inner screw rod 40 is rotatably installed in the upper screw rod 20 through a bearing (preferably a ball bearing), the transmission block 50 is an internal thread nut, and both the first driving source 60 and the second driving source 70 are motors. In addition, when the lower end of the upper screw rod 20 engages with the upper end of the lower screw rod 30, there are the following two situations where the external thread 113 on the track portion 112 of the upper screw rod 20 is connected to the external thread 113 on the track portion 112 of the lower screw rod 30: 1. The lower end of the external thread 113 on the track portion 112 of the upper screw rod 20 is exactly connected to the upper end of the external thread 113 on the track portion 112 of the lower screw rod 30; 2. A part of the external thread 113 on the track portion 112 of the upper screw rod 20 coincides with the external thread 113 on the track portion 112 of the lower screw rod 30 in the up and down direction, and the external threads 113 of the coincident part are engaged.

[0064] The engagement between the upper screw rod 20 and the lower screw rod 30 can be achieved through the cooperation of the track portion 112 of one screw rod and the sliding groove portion 114 of the other screw rod, or a section of engaging portion 13 can extend from the track portion 112, and the engagement is achieved by the cooperation of the engaging portion 13 and the sliding groove portion 114. At this time, as Figure 4 and Figure 5As shown, the upper screw rod 20 and the lower screw rod 30 both further include a connecting portion 12 and an engaging portion 13; in the upper screw rod 20, the connecting portion 12, the rail portion 112 and the engaging portion 13 are connected in sequence from top to bottom. The connecting portion 12 of the upper screw rod 20 is rotatably installed in the top plate 181 through a bearing, and the inner screw rod 40 is rotatably installed in the connecting portion 12 of the upper screw rod 20 through a ball bearing. Therefore, the inner cavity 111 of the upper screw rod 20 extends upward into its connecting portion 12; in the lower screw rod 30, the engaging portion 13, the rail portion 112 and the connecting portion 12 are connected in sequence from top to bottom. The connecting portion 12 of the lower screw rod 30 is rotatably installed in the bottom plate 191 through a bearing. The engaging portion 13 at the lower end of the upper screw rod 20 is located in the sliding groove 114 of the lower screw rod 30 and is in sliding fit with the sliding groove 114. The engaging portion 13 at the upper end of the lower screw rod 30 is located in the sliding groove 114 of the upper screw rod 20 and is in sliding fit with the sliding groove 114. The engagement between the upper screw rod 20 and the lower screw rod 30 is achieved through the cooperation between the engaging portion 13 of the upper screw rod 20 and the sliding groove 114 of the lower screw rod 30, and the cooperation between the sliding groove 114 of the upper screw rod 20 and the engaging portion 13 of the lower screw rod 30. Preferably, there is a surface contact between the engaging portion 13 of the upper screw rod 20 and the groove wall of the sliding groove 114 of the lower screw rod 30, and there is also a surface contact between the groove wall of the sliding groove 114 of the upper screw rod 20 and the engaging portion 13 of the lower screw rod 30, so as to improve the reliability when the lower screw rod 30 drives the upper screw rod 20 to rotate together. Preferably, for the engaging portion 13 at the lower end of the upper screw rod 20 and the engaging portion 13 at the upper end of the lower screw rod 30, the outer periphery of the engaging portion 13 can be a smooth surface or can be provided with an external thread 113; when the external thread 113 is provided on the outer periphery of the engaging portion 13, the engaging portion 13 is a part of the rail portion 112, or rather, the engaging portion 13 is an extension section of the rail portion 112.

[0065] Further, as Figures 1 to 3As shown, the lifting mechanism further includes a speed regulation driving source 110 installed on the lifting component 80, and a speed regulation transmission assembly connected between the speed regulation driving source 110 and the lifting driving component 90. The speed regulation driving source 110 drives the lifting driving component 90 to rotate through the speed regulation transmission assembly. The lifting driving component 90 is rotatably installed in the lifting component 80 through bearings. After the upper screw rod 20 rises to the set height, the first driving source 60 stops operating; then, the second driving source 70 starts to operate. At this time, the speed regulation driving source 110 can also drive the lifting driving component 90 to rotate. When the rotation direction of the lifting driving component 90 is the same as that of the upper screw rod 20 and the lower screw rod 30, the speed of the lifting driving component 90 moving up or down will be slowed down; when the rotation direction of the lifting driving component 90 is opposite to that of the upper screw rod 20 and the lower screw rod 30, the speed of the lifting driving component 90 moving up or down will be accelerated; therefore, the speed of the lifting driving component 90 driving the lifting component 80 to move up or down can be adjusted through the speed regulation driving source 110 and the speed regulation transmission assembly, playing a good speed regulation role. In addition, when the second driving source 70 has an accidental failure, the speed regulation driving source 110 drives the lifting driving component 90 to rotate through the speed regulation transmission assembly. While rotating, the lifting driving component 90 will move up or down along the upper screw rod 20 and the lower screw rod 30, ensuring the track function of the lifting mechanism.

[0066] Preferably, as Figure 3 shown, the speed regulation driving source 110 is a motor. The speed regulation transmission assembly includes a driving gear 120 fixed on the output shaft of the speed regulation driving source 110 and a driven gear 130 fixed on the outer periphery of the lifting driving component 90. The driving gear 120 and the driven gear 130 are meshed with each other.

[0067] Furthermore, as Figure 1 and Figure 2 shown, the lifting mechanism further includes two sets of symmetrically arranged support and guiding assemblies. The two sets of support and guiding assemblies, the connected upper screw rod 20 and the lower screw rod 30 are distributed in a triangular shape; each set of support and guiding assemblies includes an upper support rod 140 and a lower support rod 150 parallel to the upper screw rod 20 and the lower screw rod 30, and a guiding block 160 for fixing on the lifting component 80. The upper end of the upper support rod 140 is fixed in the top plate 181 and rises and falls together with the upper screw rod 20. The lower end of the lower support rod 150 is fixed in the bottom plate 191. The lower end of the upper support rod 140 and the upper end of the lower support rod 150 are sleeved and slidably matched with each other. The guiding block 160 is connected to the upper support rod 140 or the lower support rod 150 through a linear bearing 170. Figure 1 and Figure 2 shown in the view, the guiding block 160 is connected to the upper support rod 140 through a linear bearing 170. Through the two sets of support and guiding assemblies, the overall lifting mechanism can be made more stable and can play a better guiding role.

[0068] Further, the lifting mechanism further includes a controller and a limit switch. The first driving source 60, the second driving source 70, the speed-regulating driving source 110, and the limit switch are all connected to the controller. When the controller drives the first driving source 60 to act and the upper screw rod 20 rises to a preset height, the limit switch is triggered. At this time, the controller sends an instruction to the first driving source 60 to stop the action. Then, the controller sends instructions to the second driving source 70 and / or the speed-regulating driving source 110 according to the signal, so that the lifting driving component 90 drives the lifting component 80 to perform a lifting movement.

[0069] Based on the structures of the upper screw rod 20 and the lower screw rod 30 in the above-mentioned lifting mechanism, the present application further provides a screw rod 10, as Figure 4 or Figure 5 shown. The screw rod 10 involved in the present application includes a screw rod main body portion 11 extending along the axial direction of the screw rod 10. The screw rod main body portion 11 includes an inner cavity 111, a track portion 112 symmetrically arranged on the outer periphery of the inner cavity 111, an external thread 113 provided on the outer periphery of the track portion 112, and a sliding groove 114 formed between two adjacent track portions 112 along the circumferential direction of the screw rod main body portion 11. Or rather, in the circumferential direction of the screw rod main body portion 11, the track portion 112 and the sliding groove 114 are arranged at intervals, and the track portion 112 is adapted to the sliding groove 114, so that when two screw rods 10 are connected, the track portion 112 of one screw rod 10 can be located in the sliding groove 114 of the other screw rod 10 and the track portion 112 and the sliding groove 114 are in sliding fit. After the screw rod 10 is used in the lifting mechanism, there are two screw rods 10. The track portion 112 of one screw rod 10 cooperates with the sliding groove 114 of the other screw rod 10 to realize the sliding fit and engagement between the two screw rods 10. The sliding fit between the two screw rods 10 provides a space for the lifting movement of the lifting mechanism, and the engagement of the two screw rods 10 provides a track for the lifting component 80 to move up and down in the lifting mechanism, so that the lifting mechanism integrates the functions of lifting and track, and improves the function of the lifting mechanism.

[0070] Further, as Figure 4 or Figure 5As shown, there are two track parts 112 and two sliding grooves 114. In addition, the screw 10 further includes a connecting part 12 and an engaging part 13. The connecting part 12 and the engaging part 13 are respectively connected to both ends of the track part 112. The inner cavity 111 of the screw 10 extends into the connecting part 12. Therefore, the cross-section of the connecting part 12 is in an annular shape, while the cross-section of the track part 112 is in an arc segment shape. Preferably, the engaging part 13 integrally extends from one end of the track part 112 away from the connecting part 12. Thus, the engaging part 13 is adapted to the sliding groove 114, so that in two connected screws 10, the engaging part 13 of one screw 10 can be located in the sliding groove 114 of the other screw 10, and the engaging part 13 and the sliding groove 114 are in a sliding fit. The outer periphery of the engaging part 13 is a smooth surface or is provided with an external thread 113. The screw 10 with the above structure is an integrally formed part.

[0071] The above lifting mechanism can be applied to various occasions. In this application, the lifting mechanism is preferably used in a luggage case. Based on this, this application also provides a luggage case, as Figure 1 and Figure 2 shown, the luggage case includes an inner box body 180, an outer box body 190, a cleaning mechanism 200, and the above-mentioned lifting mechanism. The upper end of the upper screw 20 is rotatably installed in the top plate 181 at the top of the inner box body 180 through a bearing, and the lower end of the lower screw 30 is rotatably installed in the bottom plate 191 at the bottom of the outer box body 190 through a bearing. The cleaning mechanism 200 in the luggage case is a lifting component 80. Therefore, the cleaning mechanism 200 is connected to the lifting driving component 90 in the lifting mechanism. When the first driving source 60 in the lifting mechanism acts, the upper screw 20 will drive the inner box body 180 to move up or down together, realizing the lifting movement of the inner box body 180. After the upper screw 20 drives the inner box body 180 to rise to a preset height, the second driving source 70 acts to drive the upper screw 20 and the lower screw 30 to rotate together. The lifting driving component 90 drives the cleaning mechanism 200 to move up or down along the upper screw 20 and the lower screw 30. The upper screw 20 and the lower screw 30 constitute the tracks for the lifting movement of the lifting driving component 90 and the cleaning mechanism 200. Therefore, the luggage case can use a set of lifting mechanism to realize the lifting movement of the inner box body 180 relative to the outer box body 190 and the lifting movement of the cleaning mechanism 200 along the upper screw 20 and the lower screw 30. The lifting mechanism not only plays a lifting role but also plays a track role, making the overall structure of the luggage case compact, reasonable, with low cost, and can reduce the internal space of the box body occupied by the lifting mechanism, relatively expanding the effective space inside the box body. Preferably, in the luggage case involved in this application, the first driving source 60 in the lifting mechanism is fixedly installed on the lower end surface of the top plate 181 of the inner box body 180, and the second driving source 70 in the lifting mechanism is fixedly installed on the lower end surface of the bottom plate 191 of the outer box body 190.

[0072] In summary, the present invention effectively overcomes various drawbacks in the prior art and has high industrial utilization value.

[0073] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A lifting mechanism, characterized in that: It includes an upper screw rod (20) and a lower screw rod (30) that can be engaged, an inner screw rod (40), a transmission block (50) threadedly engaged with the inner screw rod (40), a first drive source (60) for driving the inner screw rod (40) to rotate, a second drive source (70) for driving the upper screw rod (20) or the lower screw rod (30) to rotate, and a lifting drive component (90) for connecting with a lifting component (80); Both the upper screw rod (20) and the lower screw rod (30) include a screw rod main body portion (11) extending along the axial direction of the screw rod (10), a connecting portion (12), and an engaging portion (13). The screw rod main body portion (11) includes an inner cavity (111), a track portion (112) symmetrically arranged on the outer periphery of the inner cavity (111), an external thread (113) provided on the outer periphery of the track portion (112), and a sliding groove (114) formed between two adjacent track portions (112) along the circumferential direction of the screw rod main body portion (11). The track portion (112) is adapted to the sliding groove (114); the connecting portion (12) and the engaging portion (13) are respectively connected to both ends of the track portion (112), and the engaging portion (13) is adapted to the sliding groove (114); the outer periphery of the engaging portion (13) is a smooth surface or is provided with an external thread (113); both the upper screw rod (20) and the lower screw rod (30) are integrally formed parts; The track portion (112) of the upper screw rod (20) is located in the sliding groove (114) of the lower screw rod (30) and the two are in sliding fit, and the track portion (112) of the lower screw rod (30) is located in the sliding groove (114) of the upper screw rod (20) and the two are in sliding fit; the inner screw rod (40) is rotatably installed in the inner cavity (111) of one of the two screw rods, i.e., the upper screw rod (20) and the lower screw rod (30), and the transmission block (50) is fixed in the inner cavity (111) of the other of the two screw rods, i.e., the upper screw rod (20) and the lower screw rod (30); the lifting drive component (90) is threadedly engaged with the track portion (112) of the upper screw rod (20) or the lower screw rod (30); after the upper screw rod (20) and the lower screw rod (30) are engaged, the external thread (113) on the track portion (112) of the upper screw rod (20) is in contact with the external thread (113) on the track portion (112) of the lower screw rod (30).

2. The lifting mechanism according to claim 1, characterized in that: It further includes a speed regulation drive source (110) installed on the lifting component (80), and a speed regulation transmission assembly connected between the speed regulation drive source (110) and the lifting drive component (90). The speed regulation drive source (110) drives the lifting drive component (90) to rotate through the speed regulation transmission assembly, and the lifting drive component (90) is rotatably installed in the lifting component (80).

3. The lifting mechanism according to claim 2, wherein: The speed regulation drive source (110) is a motor, and the speed regulation transmission assembly includes a driving gear (120) fixed on the output shaft of the speed regulation drive source (110), and a driven gear (130) fixed on the outer periphery of the lifting drive component (90). The driving gear (120) and the driven gear (130) are engaged with each other.

4. The lifting mechanism according to claim 1, characterized in that: The first driving source (60) and the second driving source (70) are both motors.

5. The lifting mechanism according to claim 1, wherein: It further includes two groups of support and guiding assemblies. The two groups of support and guiding assemblies, the connected upper screw rod (20) and the lower screw rod (30) are distributed in a triangular shape; each group of support and guiding assemblies includes an upper support rod (140) and a lower support rod (150) parallel to the upper screw rod (20) and the lower screw rod (30), and a guiding block (160) for being fixed to the lifting member (80). The upper support rod (140) and the lower support rod (150) are sleeved and are in sliding fit with each other. The guiding block (160) is connected to the upper support rod (140) or the lower support rod (150) through a linear bearing (170).

6. The lifting mechanism according to claim 1, characterized in that: There are two of the track portions (112) and the sliding grooves (114).

7. A luggage case, comprising an inner box body (180), an outer box body (190), and a cleaning mechanism (200), characterized in that: It further includes the lifting mechanism according to any one of claims 1-6. The upper end of the upper screw rod (20) is rotatably installed in the top plate (181) of the inner box body (180), and the lower end of the lower screw rod (30) is rotatably installed in the bottom plate (191) of the outer box body (190). The cleaning mechanism (200) in the luggage forms the lifting member (80) and is connected to the lifting driving member (90) in the lifting mechanism.

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