A lifting mechanism with large thrust and large stroke

Abstract

The present invention discloses a large-thrust and large-stroke lifting mechanism, including a base plate assembly, a lifting assembly, a top plate assembly and a driving assembly; wherein the base plate assembly is used as the bottom plate of the lifting mechanism, the top of the base plate assembly is respectively connected to the lifting assembly and the driving assembly, the top of the lifting assembly is connected to the top plate assembly, and the driving assembly is used to drive the lifting assembly to move up and down in the vertical direction. Through the cooperation of the lifting assembly and the driving assembly, the present invention can achieve the positioning accuracy of the top plate assembly in the horizontal plane at any height point of the lifting, and has good tolerance for load bias, and occupies little space in the height direction of the lifting, so that the lifting stroke of the lifting mechanism can be greater than the compression height of the lowest position of the mechanism in a limited space. At the same time, since all components are precision-processed and the size matching clearance is reasonable, the overall rigidity can be maintained.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical lifting mechanisms, and in particular relates to a large-thrust and large-stroke lifting mechanism. Background Art

[0002] In the automation and connection operation transformation plan for machine tools with exchange workbenches, the stacker fork cannot pick up materials due to the small distance between the workbench and the bed. The workbench needs to be lifted to facilitate the fork to pick up materials, so this mechanism is specially invented. This mechanism effectively solves the difficulty of arranging the jacking device in the narrow space between the machine bed and the workbench, and the jacking stroke needs to be greater than the height of the device body. The existing jacking device generally cannot achieve sufficient stroke when it can be arranged, and there is a problem of interference with the machine tool and cannot be installed when there is sufficient stroke. In addition, the existing jacking devices generally have the problem of lack of precise positioning and the ability to resist off-center loading. Summary of the invention

[0003] The object of the present invention is to provide a large-thrust and large-stroke lifting mechanism, which has high positioning accuracy on the horizontal plane and good anti-eccentric load capability.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a large-thrust and large-stroke lifting mechanism, including a base plate assembly, a lifting assembly, a top plate assembly and a driving assembly; wherein the base plate assembly is used as the bottom plate of the lifting mechanism, the top of the base plate assembly is respectively connected to the lifting assembly and the driving assembly, the top of the lifting assembly is connected to the top plate assembly, and the driving assembly is used to drive the lifting assembly to move up and down in the vertical direction.

[0005] The substrate assembly includes a substrate body, a first linear guide, a push plate and a first fixed seat; wherein the substrate body serves as a load base plate for carrying the mounting guide rail, the push plate and the first fixed seat; the first linear guide is a double guide structure, the two guides are arranged in parallel in a groove in the middle of the substrate body, and first sliders are arranged on both guides; the push plate is connected to the first slider and moves on the guide rail following the first slider; the first fixed seat is arranged on the side of the substrate body away from the driving assembly, and is used to connect and fix the lifting assembly; the push plate is connected to the driving assembly and the lifting assembly respectively.

[0006] The push plate includes a push plate body and a piston pressure plate. The push plate body is connected to a driving assembly through the piston pressure plate. The piston pressure plate is connected to a lifting assembly. The driving assembly drives the piston pressure plate to move to drive the first slider to move, thereby driving the lifting assembly to move up and down in a vertical direction.

[0007] The lifting assembly is a double-group scissor-leg mechanism, including two support arm groups, a central axis, a number of connecting rods and a number of pins; wherein, a number of holes are provided on the support arms for connecting the central axis, the connecting rods and the pins; the central axis is used to connect the two support arm groups; the connecting rod is connected to the support arm, and the support arm structure is stable through the cooperation with the central axis; the support arm group is respectively connected to the hinge seat and the top plate assembly through the pins; the support arm group is connected to the push plate.

[0008] Each support arm group includes two support arms, which are divided into an outer support arm and an inner support arm. The setting width between the two outer support arms is greater than the setting width between the two inner support arms. Both the outer support arm and the inner support arm can rotate along the central axis.

[0009] The connecting rod comprises two short connecting rods and two long connecting rods, the two short connecting rods are installed between two inner supporting arms, and the two long connecting rods are installed between two outer supporting arms.

[0010] The top plate assembly includes a top plate body, a second linear guide, a slide plate, a second fixed seat and a positioning ring; wherein the top plate body serves as a load plate for carrying and installing the second linear guide, the slide plate, the second fixed seat and the positioning ring; the second linear guide is a double guide structure, the two guides are arranged in parallel in the groove at the bottom of the top plate body, and second sliders are arranged on both guides; the slide plate is connected to the second slider and moves on the guide rail following the second slider; the second fixed seat is connected to the bottom of the base plate body, and its setting position corresponds to the first fixed seat, which is used to connect and fix the support arm, and the first fixed seat and the second fixed seat are both arranged in two, the first fixed seat is respectively connected to the two outer support arms, and the second fixed seat is respectively connected to the two inner support arms; the slide plate is respectively connected to the two outer support arms, and the push plate is respectively connected to the two inner support arms; the positioning ring is connected to the top of the top plate body to limit the load positioning.

[0011] The first fixing seat and the second fixing seat are both hinge seats, which are used for being hinged to the lifting assembly.

[0012] The degree of freedom of translation of the first slider and the second slider in the guide rail is 1.

[0013] The driving component is a pneumatic cylinder or an oil cylinder.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Through the cooperation of the lifting assembly and the driving assembly, the present invention can achieve the positioning accuracy of the top plate assembly in the horizontal plane at any lifting height point, and has good tolerance for load bias. It occupies a small space in the lifting height direction. Therefore, it can be achieved in a limited space that the lifting stroke of the lifting mechanism is greater than the compression height of the lowest position of the mechanism. At the same time, since all components are precisely processed and the size matching clearance is reasonable, the overall rigidity can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0017] Figure 2 is a side cross-sectional view of an embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of a substrate assembly in an embodiment of the present invention;

[0019] Figure 4 It is a structural schematic diagram of a double-set scissor leg structure in an embodiment of the present invention;

[0020] Figure 5 It is a structural schematic diagram of a double-set scissor leg structure from one perspective in an embodiment of the present invention;

[0021] Figure 6 It is a structural schematic diagram of the top surface of the top plate assembly in an embodiment of the present invention;

[0022] Figure 7 It is a structural schematic diagram of the bottom surface of the top plate assembly in an embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of the structure of the connection between the oil cylinder / gas cylinder and the base plate body in an embodiment of the present invention;

[0024] Fig. 9 A side cross-sectional view of an oil cylinder / gas cylinder in an embodiment of the present invention;

[0025] Fig.10 It is a side cross-sectional view of the first embodiment of the present invention at a lifting height;

[0026] Fig.11 is a side cross-sectional view of another lifting height of an embodiment of the present invention;

[0027] In the figure, 10-base plate assembly, 11-base plate body, 12-first linear guide, 121-first guide, 122-first slider, 13-push plate, 131-push plate body, 132-piston pressure plate, 14-first fixed seat, 20-double set of scissor legs, 21-support arm, 22-center axis, 23-connecting rod, 24-pin shaft, 30-top plate assembly, 31-top plate body, 32-second linear guide, 321-second guide, 322-second slider, 33-slide plate, 34-second fixed seat, 35-positioning ring, 40-oil / gas cylinder, 41-cylinder body, 42-piston rod, 43-piston head. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] The technical solution of the present invention is: the present invention provides a large thrust and large stroke lifting mechanism, referring to Figure 1-Figure 11 The lifting mechanism includes a base plate assembly 10, a double set of scissor legs 20, a top plate assembly 30, and an oil / gas cylinder 40.

[0030] The substrate assembly 10 includes a substrate body 11 , a first linear guide rail 12 , a push plate 13 , and a first fixing seat 14 .

[0031] The first linear guide rail 12 includes a first guide rail 121 and a first slider 122 ; the push plate 13 includes a push plate body 131 and a piston pressure plate 132 .

[0032] Preferably, the substrate body 11 is made of high-strength carbon steel plate through precision machining, and has the characteristics of high strength, high dimensional accuracy, and good form and position tolerance; the substrate body 11 is the basis of the entire mechanism, and the remaining components are directly or indirectly mounted on the substrate body 11. The bottom surface of the substrate body 11 is the mechanism mounting surface, and the lifting mechanism is fixed to other equipment or devices through the mounting holes on the substrate body 11.

[0033] Preferably, the first linear guide rails 12 are arranged in pairs in parallel, and are selected to have the characteristics of high precision and high load. The first guide rails 121 are installed in the corresponding grooves of the substrate body 11, and the first slider 122 has only one degree of freedom of translation on the first guide rails 121;

[0034] Preferably, the push plate 13 is a moving end (in this embodiment, the parts connected to the outer support arm are fixed ends, and the parts connected to the inner support arm are moving ends), and the push plate body 131 is also made of high-strength carbon steel through precision machining, and has the characteristics of high strength, high dimensional accuracy, and good form and position tolerance; the push plate body 131 is fixed on the two first sliders 122 and can perform an overall translational action; the piston pressure plate 132 is installed in the middle of the push plate body 131, and its function is to floatly connect the push plate 13 and the oil / cylinder 40.

[0035] Preferably, the first fixed seat 14 is a hinge seat (in this embodiment, the parts connected to the outer support arm are fixed ends, and the parts connected to the inner support arm are movable ends), which is installed in the corresponding groove on the side of the base plate body 11 away from the cylinder, and is used to effectively and reliably bear and support the double set of scissor legs 20.

[0036] Preferably, the first guide rail 121 and the first fixing seat 14 are both installed in the corresponding limiting grooves of the substrate body 11, which ensures the accuracy of the relative position dimensions of each component, and can effectively bear the horizontal component of the load, thereby increasing the upper limit of the lifting force of the mechanism.

[0037] The double set of scissor legs 20 includes a support arm 21 , a central axis 22 , a connecting rod 23 , and a pin 24 .

[0038] Preferably, the support arm 21 is made of high-strength carbon steel through precision machining, the spacing between the center hole, the pin hole, and the connecting rod fixing hole is strictly controlled, the parallelism is good, and the consistency of the four parts is strictly guaranteed;

[0039] Preferably, the central shaft 22 passes through the central holes of the four support arms 21 to install them in parallel;

[0040] Preferably, two shorter connecting rods 23 are installed on the two inner support arms 21, and two longer connecting rods 23 are installed on the two outer support arms 21. The support arms 21 are divided into two inner and outer groups through the connection and fixation of the connecting rods 23. The parts in the groups are relatively fixed, and the two groups of support arms 21 can rotate around the center hole of the central axis 22.

[0041] Preferably, the pin 24 is made of a material with high yield strength and can withstand a large shear load. The double set of scissor legs 20 are connected to the base plate assembly 10 and the top plate assembly 30 respectively through the pin 24.

[0042] Preferably, the pin shaft 24 of the double set of scissor legs 20 can have two sets, each set including a fixed end and a movable end. The lower set of fixed ends installs the support arm 21 to the first fixed seat 14, and the lower set of movable ends installs the support arm 21 to the push plate body 131.

[0043] The top plate assembly 30 includes a top plate body, a second linear guide rail 32, a slide plate 33, a second fixed seat 34, and a positioning ring 35. The second linear guide rail 32 includes a second guide rail 321 and a second slide block 322;

[0044] Preferably, the top plate body is also made of high-strength carbon steel plate through precision machining, and has the characteristics of high strength, high dimensional accuracy, and good form and position tolerance. The top surface of the top plate body is the load bearing surface of the entire mechanism;

[0045] Preferably, the second linear guide rails 32 are also arranged in pairs in parallel, and are selected to have the characteristics of high precision and high load. The second guide rails 321 are installed in the corresponding grooves of the top plate body, and the second slider 322 has only one degree of freedom of translation on the second guide rails 321;

[0046] Preferably, the slide plate 33 is a moving end, which is made of high-strength carbon steel through precision machining, and has the characteristics of high strength, high dimensional accuracy, and good shape and position tolerance; the slide plate 33 is fixed on the second slider 322, and can perform an overall translational action; the upper moving ends of the double set of scissor legs 20 are connected as a whole through the slide plate 33, so as to enhance the tolerance of the mechanism to eccentric load;

[0047] Preferably, the second fixing seat 34 is also a hinge seat, which is installed in a corresponding groove of the top plate body away from the driving side, and is used to effectively and reliably carry and support the upper fixed ends of the double set of scissor legs 20;

[0048] Preferably, the slide rail 321 and the second fixing seat 34 are both installed in the corresponding limiting grooves of the top plate body; that is, the relative position and size accuracy of each component is ensured, and at the same time, the horizontal component of the load can be effectively carried, thereby increasing the upper limit of the lifting force of the mechanism.

[0049] Preferably, a positioning ring 35 is installed on the top surface of the top plate body to position the load tray in the horizontal plane and limit the degree of freedom;

[0050] The oil / gas cylinder 40 includes a cylinder body 41, a piston rod 42, and a piston head 43; the cylinder body 41 and the piston rod 42 are the driving components of the mechanism, which convert the pressure of the hydraulic station / external air source into the driving force for the extension (contraction) of the piston rod 42, and the left and right sides of the piston head 43 are used to connect the push plate 13 to the oil / gas cylinder 40 in a floating manner;

[0051] The present invention describes a large-thrust and large-stroke lifting mechanism. When the piston rod 42 of the hydraulic station / external air source / driving oil / cylinder 40 extends, the piston head 43 and the push plate 13 are driven to translate toward the first fixed seat 14 to reduce the distance between the two. When the distance is reduced, the angle between the inner and outer support arms 21 is reduced, and the central axis 22 and the upper part of the support arm 21 both rise synchronously. At this time, the upper slide plate 33 and the second slide block 322 keep following and keep supporting the top plate body. Since the rising distance of the slide plate 33 and the second fixed seat 34 remains consistent throughout the entire process, the top plate will not appear tilted in the front view plane, and the translational action can be maintained during the up and down lifting process.

[0052] In principle, the lifting stroke of the lifting mechanism is only related to the spacing between the pin holes of the support arm 21 and the stroke of the oil / gas cylinder 40, and when the lifting mechanism is lowered to the lowest position, the two groups of support arms 21 on the inner and outer sides of the double-set scissor legs 20 are in a folded state, and the space occupied in the height direction of the lifting is small. Therefore, it can be achieved in a limited space that the lifting stroke of the lifting mechanism is greater than the compression height of the lowest position of the mechanism. At the same time, since all components are precision-machined and the size matching clearance is reasonable, the overall rigidity can be maintained, so the positioning accuracy of the top plate body in the horizontal plane at any lifting height point can be achieved, and it has good tolerance for load offset.

[0053] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-thrust and large-stroke lifting mechanism, characterized in that: It includes a base plate assembly, a lifting assembly, a top plate assembly and a driving assembly; wherein the base plate assembly is used as the bottom plate of the lifting mechanism, the top of the base plate assembly is respectively connected to the lifting assembly and the driving assembly, the top of the lifting assembly is connected to the top plate assembly, and the driving assembly is used to drive the lifting assembly to move up and down in the vertical direction.

2. A large-thrust and large-stroke lifting mechanism according to claim 1, characterized in that: The substrate assembly includes a substrate body, a first linear guide, a push plate and a first fixed seat; wherein the substrate body serves as a load base plate for carrying the mounting guide rail, the push plate and the first fixed seat; the first linear guide is a double guide structure, the two guides are arranged in parallel in a groove in the middle of the substrate body, and first sliders are arranged on both guides; the push plate is connected to the first slider and moves on the guide rail following the first slider; the first fixed seat is arranged on the side of the substrate body away from the driving assembly, and is used to connect and fix the lifting assembly; the push plate is connected to the driving assembly and the lifting assembly respectively.

3. A large-thrust and large-stroke lifting mechanism according to claim 2, characterized in that: The push plate includes a push plate body and a piston pressure plate. The push plate body is connected to a driving assembly through the piston pressure plate. The piston pressure plate is connected to a lifting assembly. The driving assembly drives the piston pressure plate to move to drive the first slider to move, thereby driving the lifting assembly to move up and down in a vertical direction.

4. A large-thrust and large-stroke lifting mechanism according to claim 1, characterized in that: The lifting assembly is a double-group scissor-leg mechanism, including two support arm groups, a central axis, a number of connecting rods and a number of pins; wherein, a number of holes are provided on the support arms for connecting the central axis, the connecting rods and the pins; the central axis is used to connect the two support arm groups; the connecting rod is connected to the support arm, and the support arm structure is stable through the cooperation with the central axis; the support arm group is respectively connected to the hinge seat and the top plate assembly through the pins; the support arm group is connected to the push plate.

5. A large-thrust and large-stroke lifting mechanism according to claim 4, characterized in that: Each support arm group includes two support arms, which are divided into an outer support arm and an inner support arm. The setting width between the two outer support arms is greater than the setting width between the two inner support arms. Both the outer support arm and the inner support arm can rotate along the central axis.

6. A large-thrust and large-stroke lifting mechanism according to claim 5, characterized in that: The connecting rod comprises two short connecting rods and two long connecting rods, the two short connecting rods are installed between two inner supporting arms, and the two long connecting rods are installed between two outer supporting arms.

7. A large-thrust and large-stroke lifting mechanism according to claim 4, characterized in that: The top plate assembly includes a top plate body, a second linear guide, a slide plate, a second fixed seat and a positioning ring; wherein the top plate body serves as a load plate for carrying and installing the second linear guide, the slide plate, the second fixed seat and the positioning ring; the second linear guide is a double guide structure, the two guides are arranged in parallel in the groove at the bottom of the top plate body, and second sliders are arranged on both guides; the slide plate is connected to the second slider and moves on the guide rail following the second slider; the second fixed seat is connected to the bottom of the base plate body, and its setting position corresponds to the first fixed seat, which is used to connect and fix the support arm, and the first fixed seat and the second fixed seat are both arranged in two, the first fixed seat is respectively connected to the two outer support arms, and the second fixed seat is respectively connected to the two inner support arms; the slide plate is respectively connected to the two outer support arms, and the push plate is respectively connected to the two inner support arms; the positioning ring is connected to the top of the top plate body to limit the load positioning.

8. A large-thrust and large-stroke lifting mechanism according to claim 7, characterized in that: The first fixing seat and the second fixing seat are both hinge seats, which are used for being hinged to the lifting assembly.

9. A large-thrust and large-stroke lifting mechanism according to claim 7, characterized in that: The degree of freedom of translation of the first slider and the second slider in the guide rail is 1.

10. A large-thrust and large-stroke lifting mechanism according to claim 1, characterized in that: The driving component is a pneumatic cylinder or an oil cylinder.

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