A lifting and positioning mechanism that combines mechanical locking and electromagnetic holding

Abstract

A lifting and positioning mechanism combining mechanical locking and electromagnetic holding includes a lifting plate, a base plate, a guide support reset unit, a locking and positioning execution unit, and a distance-triggered proximity switch. The lifting plate is located directly above the base plate, and the two are parallel to each other. The guide support reset unit is disposed between the lifting plate and the base plate. The locking and positioning execution unit is disposed between the lifting plate and the base plate. The distance-triggered proximity switch is disposed on the upper surface of the base plate. This lifting and positioning mechanism, combining mechanical locking and electromagnetic holding, utilizes both the rigid limiting characteristics provided by mechanical locking and the anti-slip characteristics provided by electromagnetic holding to achieve double insurance for lifting and positioning locking, further improving lifting and positioning accuracy. Maintaining the mechanical locking state does not excessively rely on the continuous supply of external power, thus preventing the lifting plate from unexpectedly springing up after the external load is removed, improving the stability and reliability of lifting and positioning.

Description

Technical Field

[0001] This invention belongs to the field of lifting and positioning technology, and in particular relates to a lifting and positioning mechanism that combines mechanical locking and electromagnetic holding. Background Technology

[0002] In automated assembly, pressing, and testing scenarios, when the lifting mechanism is subjected to external loads, its lifting plate needs to descend to a preset height and maintain stability. After the external load is removed, the lifting plate needs to reliably reset.

[0003] In the existing technology, the positioning schemes of lifting mechanisms mainly include continuous power holding type, pure mechanical self-locking type and pure spring return type.

[0004] For continuous power holding type lifting mechanism positioning solutions, which use cylinders or motors to continuously output force or torque, although they can maintain the target position of the lifting plate, they consume a lot of energy and pose a safety hazard of falling when the air or power is cut off, and may also cause abnormal rebound.

[0005] For positioning schemes of purely mechanical self-locking lifting mechanisms, worm gears, ratchet pawls, and other self-locking structures are commonly used. Although they can lock without power input, the locking structure has a clearance, which causes slight movement after locking, thus affecting the positioning accuracy of the lifting mechanism. In addition, there is a drawback that it is difficult to unlock multiple points simultaneously.

[0006] For the positioning scheme of the pure spring return type lifting mechanism, the positioning is mainly achieved by the balance between the external load force and the spring reaction force. However, the positioning accuracy is low, and the positioning state cannot be maintained after the external load force is removed, which limits its applicable scenarios.

[0007] In addition, in the existing technology, the lifting mechanism generally adopts a structure in which the locking point and the guide point are shared. The guide component in the lifting mechanism will affect its locking accuracy due to wear, which will weaken the lifting mechanism's ability to resist off-center load when the position is locked. Summary of the Invention

[0008] To address the problems existing in the prior art, this invention provides a lifting and positioning mechanism that combines mechanical locking and electromagnetic holding. Through the synergistic effect of mechanical locking and electromagnetic holding, it utilizes both the rigid limiting characteristics provided by mechanical locking and the anti-slip characteristics provided by electromagnetic holding, achieving double insurance for lifting and positioning locking and further improving the lifting and positioning accuracy. The mechanical locking state does not excessively rely on the continuous supply of external power, thus preventing the lifting plate from accidentally bouncing up after the external load is removed, thereby improving the stability and reliability of lifting and positioning.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a lifting and positioning mechanism that combines mechanical locking and electromagnetic holding, comprising a lifting plate, a base plate, a guide support and reset unit, a locking and positioning execution unit, and a distance-triggered proximity switch; the lifting plate is located directly above the base plate and the two are distributed in parallel; the guide support and reset unit is disposed between the lifting plate and the base plate; the locking and positioning execution unit is disposed between the lifting plate and the base plate; and the distance-triggered proximity switch is disposed on the upper surface of the base plate.

[0010] The number of guide support reset units is several, and the several guide support reset units are evenly distributed along the circumference of the lifting plate and the base plate.

[0011] The number of locking and positioning execution units is several, and the several locking and positioning execution units are evenly distributed along the circumference of the lifting plate and the base plate.

[0012] The guide support reset unit and the locking positioning execution unit are staggered in the circumferential direction.

[0013] The guide support reset unit includes a guide support shaft, a guide support sleeve, and a guide support reset spring. A first adapter flange is fixedly installed at the top of the guide support shaft, and the top of the guide support shaft is fixedly connected to the lifting plate through the first adapter flange. The bottom end of the guide support shaft passes through the base plate and extends below the base plate. The guide support sleeve is coaxially fitted on the outside of the guide support shaft. A second adapter flange is fixedly installed at the bottom end of the guide support sleeve, and the second adapter flange is located below the base plate. The bottom end of the guide support sleeve is fixedly connected to the base plate through the second adapter flange. The guide support reset spring is coaxially fitted on the outside of the guide support sleeve. The top end of the guide support reset spring is in contact with the first adapter flange, and the bottom end of the guide support reset spring is in contact with the base plate.

[0014] A buffer sleeve is fitted onto the guide support shaft between the top of the guide support sleeve and the first transition flange.

[0015] A limit stop is fixedly installed at the bottom end of the guide support shaft.

[0016] The locking and positioning execution unit includes a base frame, a mechanical locking assembly, a coupling transmission assembly, a cylinder, and an electromagnet. The base frame is located below the base plate, and the top of the base frame is fixedly connected to the base plate. The mechanical locking assembly is disposed between the base frame and the lifting plate. The coupling transmission assembly is disposed between the mechanical locking assembly and the base frame. The cylinder and the electromagnet are both fixedly installed at the bottom of the base frame. The cylinder and the electromagnet are used in conjunction with the coupling transmission assembly. The control ends of the cylinder and the electromagnet are electrically connected to a distance-triggered proximity switch.

[0017] The mechanical locking assembly includes a locking vertical rod, a locking horizontal rod, a locking guide sleeve, and a locking return spring. The upper end of the locking vertical rod is fixedly connected to the lifting plate via an adjusting positioning nut, and the lower end of the locking vertical rod passes through the base plate and extends below the base plate. A locking ring groove is provided on the lower end of the locking vertical rod. The locking guide sleeve is horizontally mounted and fixed on the base frame. A locking vertical rod through hole is provided vertically on one end of the locking guide sleeve. The locking horizontal rod is coaxially mounted inside the locking guide sleeve. One end of the locking horizontal rod is engaged with the locking ring groove, and the other end of the locking horizontal rod extends to the outside of the locking guide sleeve. A limit baffle is fixedly provided on the rod of the locking horizontal rod located outside the locking guide sleeve. The locking return spring is coaxially mounted on the outside of the locking guide sleeve. One end of the locking return spring is in contact with the base frame, and the other end of the locking return spring is in contact with the limit baffle.

[0018] The coupling transmission assembly includes a lever, a hinge seat, a force transmission push rod, a universal ball joint, and a magnetic plate. The hinge seat is located below the locking guide sleeve and is fixedly connected to the base frame. The fulcrum of the lever is rotatably connected to the hinge seat via a hinge shaft, and the upper end of the lever abuts against the outer end of the locking crossbar. The force transmission push rod is fixedly installed at the lower end of the lever, and one end of the force transmission push rod abuts against the end of the piston rod of the cylinder. The center of the magnetic plate is connected to the other end of the force transmission push rod via a universal ball joint, and the magnetic plate is attracted and engaged with an electromagnet.

[0019] The beneficial effects of this invention are: The lifting and positioning mechanism of the present invention, which combines mechanical locking and electromagnetic holding, utilizes the rigid limiting characteristics provided by mechanical locking and the anti-slip characteristics provided by electromagnetic holding to achieve double insurance for lifting and positioning locking, and further improves the lifting and positioning accuracy. The mechanical locking state is not overly dependent on the continuous supply of external power, thus preventing the lifting plate from accidentally bouncing up after the external load is removed, thereby improving the stability and reliability of lifting and positioning. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a lifting and positioning mechanism that combines mechanical locking and electromagnetic holding according to the present invention; Figure 2 This is a schematic diagram of the structure of the guide support reset unit of the present invention; Figure 3 This is a schematic diagram of the locking and positioning execution unit (overall) of the present invention (view 1); Figure 4 This is a structural schematic diagram (cross-sectional view) of the locking and positioning execution unit of the present invention (view 2); In the diagram, 1—lifting plate, 2—base plate, 3—guide support reset unit, 4—locking and positioning execution unit, 5—distance trigger proximity switch, 6—guide support shaft, 7—guide support sleeve, 8—guide support reset spring, 9—first transition flange, 10—second transition flange, 11—buffer sleeve, 12—limit stop, 13—base frame, 14—cylinder, 15—electromagnet, 16—locking vertical rod, 17—locking horizontal rod, 18—locking guide sleeve, 19—locking reset spring, 20—distance adjustment positioning nut, 21—locking ring groove, 22—locking vertical rod through hole, 23—limit stop, 24—lever, 25—hinge seat, 26—force transmission push rod, 27—universal ball joint, 28—magnetic plate, 29—hinge shaft. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-4 As shown, a lifting and positioning mechanism that combines mechanical locking and electromagnetic holding includes a lifting plate 1, a base plate 2, a guide support and reset unit 3, a locking and positioning execution unit 4, and a distance-triggered proximity switch 5. The lifting plate 1 is located directly above the base plate 2 and the two are parallel to each other. The guide support and reset unit 3 is disposed between the lifting plate 1 and the base plate 2. The locking and positioning execution unit 4 is disposed between the lifting plate 1 and the base plate 2. The distance-triggered proximity switch 5 is disposed on the upper surface of the base plate 2.

[0023] The guide support reset unit 3 is of several kinds, and the several guide support reset units 3 are evenly distributed along the circumference of the lifting plate 1 and the base plate 2. In this embodiment, the number of guide support reset units 3 is set to three sets, and the three sets of guide support reset units 3 are evenly distributed in the circumferential direction with a phase angle of 120°.

[0024] The number of locking and positioning execution units 4 is several, and the several locking and positioning execution units 4 are evenly distributed along the circumference of the lifting plate 1 and the base plate 2. In this embodiment, the number of locking and positioning execution units 4 is set to three sets, and the three sets of locking and positioning execution units 4 are evenly distributed in the circumferential direction with a phase angle of 120°.

[0025] The guide support reset unit 3 and the locking positioning execution unit 4 are staggered in the circumferential direction. In this embodiment, the stagger angle between the guide support reset unit 3 and the locking positioning execution unit 4 in the circumferential direction is 60°.

[0026] The guide support reset unit 3 includes a guide support shaft 6, a guide support sleeve 7, and a guide support reset spring 8. A first transition flange 9 is fixedly installed at the top of the guide support shaft 6, and the top of the guide support shaft 6 is fixedly connected to the lifting plate 1 through the first transition flange 9. The bottom end of the guide support shaft 6 passes through the base plate 2 and extends below the base plate 2. The guide support sleeve 7 is coaxially fitted on the outside of the guide support shaft 6. A second transition flange 10 is fixedly installed at the bottom of the guide support sleeve 7, and the second transition flange 10 is located below the base plate 2. The bottom end of the guide support sleeve 7 is fixedly connected to the base plate 2 through the second transition flange 10. The guide support reset spring 8 is coaxially fitted on the outside of the guide support sleeve 7. The top end of the guide support reset spring 8 is in abutting contact with the first transition flange 9, and the bottom end of the guide support reset spring 8 is in abutting contact with the base plate 2.

[0027] A buffer sleeve 11 is fitted on the guide support shaft 6 between the top end of the guide support sleeve 7 and the first transition flange 9.

[0028] A limit stop 12 is fixedly installed at the bottom end of the guide support shaft 6.

[0029] The locking and positioning execution unit 4 includes a base frame 13, a mechanical locking assembly, a coupling transmission assembly, a cylinder 14, and an electromagnet 15. The base frame 13 is located below the base plate 2, and the top of the base frame 13 is fixedly connected to the base plate 2. The mechanical locking assembly is disposed between the base frame 13 and the lifting plate 1. The coupling transmission assembly is disposed between the mechanical locking assembly and the base frame 13. The cylinder 14 and the electromagnet 15 are both fixedly installed at the bottom of the base frame 13. The cylinder 14 and the electromagnet 15 are both used in conjunction with the coupling transmission assembly. The control ends of the cylinder 14 and the electromagnet 15 are both electrically connected to the distance-triggered proximity switch 5.

[0030] The mechanical locking assembly includes a locking vertical rod 16, a locking horizontal rod 17, a locking guide sleeve 18, and a locking return spring 19. The upper end of the locking vertical rod 16 is fixedly connected to the lifting plate 1 via an adjusting positioning nut 20, and the lower end of the locking vertical rod 16 passes through the base plate 2 and extends below the base plate 2. A locking ring groove 21 is provided on the lower end of the locking vertical rod 16. The locking guide sleeve 18 is horizontally mounted and fixed on the base frame 13, and a locking vertical rod through hole is provided vertically on one end of the sleeve 18. 22; The locking crossbar 17 is coaxially inserted into the locking guide sleeve 18. One end of the locking crossbar 17 is engaged with the locking ring groove 21, and the other end of the locking crossbar 17 extends to the outside of the locking guide sleeve 18. A limit baffle 23 is fixedly provided on the body of the locking crossbar 17 located outside the locking guide sleeve 18; The locking return spring 19 is coaxially fitted on the outside of the locking guide sleeve 18. One end of the locking return spring 19 is in abutting contact with the base frame 13, and the other end of the locking return spring 19 is in abutting contact with the limit baffle 23.

[0031] The coupling transmission assembly includes a lever 24, a hinge seat 25, a force transmission push rod 26, a universal ball joint 27, and a magnet 28. The hinge seat 25 is located below the locking guide sleeve 18 and is fixedly connected to the base frame 13. The fulcrum of the lever 24 is rotatably connected to the hinge seat 25 via a hinge shaft 29, and the upper end of the lever 24 abuts against the outer end of the locking crossbar 17. The force transmission push rod 26 is fixedly installed at the lower end of the lever 24, and one end of the force transmission push rod 26 abuts against the end of the piston rod of the cylinder 14. The center of the magnet 28 is connected to the other end of the force transmission push rod 26 via the universal ball joint 27, and the magnet 28 is attracted and engaged with the electromagnet 15.

[0032] The following describes a single use of the present invention with reference to the accompanying drawings: When an external load is applied to the lifting plate 1, it will cause the lifting plate 1 to move downward, making the gap between the lifting plate 1 and the base plate 2 smaller. The guide support shaft 6 and the locking vertical rod 16 move downward synchronously with the lifting plate 1. The guide support reset spring 8 is compressed and accumulates spring force until the gap between the lifting plate 1 and the base plate 2 reaches the set trigger value of the fixed distance trigger proximity switch 5. At this time, the locking ring groove 21 on the lower end of the locking vertical rod 16 is exactly aligned with the locking horizontal rod 17, and the cylinder 14 and the electromagnet 15 start to run.

[0033] After cylinder 14 is activated, its piston rod extends and drives the force transmission push rod 26 and the magnetic plate 28 to move toward electromagnet 15. At the same time, under the magnetic attraction generated by electromagnet 15 after activation, the magnetic plate 28 is further driven to move toward electromagnet 15 until the magnetic plate 28 and electromagnet 15 are completely attracted and attached together. Then, cylinder 14 locks the air to maintain the posture. At the same time, the magnetic plate 28 is fixed in position under the electromagnetic force output by electromagnet 15. Thus, the lifting, positioning and locking are double-safety achieved through the coordinated position maintenance of cylinder 14 and electromagnet 15.

[0034] As the force-transmitting push rod 26 moves from the cylinder 14 side to the electromagnet 15 side, it will simultaneously drive the lever 24 to swing around the center line of the hinge shaft 29. During the swing of the lever 24, the upper end of the lever 24 will generate a pushing force on the locking crossbar 17 until the inner end of the locking crossbar 17 is pressed into the locking ring groove 21 at the lower end of the locking vertical bar 16, thereby achieving mechanical locking of the locking vertical bar 16. At the same time, the locking return spring 19 is compressed and accumulates spring force.

[0035] Once the locking rod 16 completes the mechanical locking, the lifting plate 1 can be reliably and stably maintained at the set height position. When the external load force is removed from the lifting plate 1, the mechanical locking state will not change and can continue to be maintained.

[0036] After the external load is removed, when the lifting plate 1 needs to be raised and reset, simply control the electromagnet 15 to be de-energized and control the piston rod of the cylinder 14 to retract and reset, releasing the limiting fixation of the magnet plate 28 and the force transmission push rod 26. Then, the locking reset spring 19 extends and releases the spring force, driving the locking crossbar 17 back to the initial position through the limiting baffle 23. At the same time, the retracting locking crossbar 17 further drives the lever 24 to swing and reset.

[0037] During the process of the locking horizontal bar 17 retracting to the initial position, the inner end of the locking horizontal bar 17 first disengages from the locking ring groove 21 at the lower end of the locking vertical bar 16, thereby unlocking the locking vertical bar 16. Subsequently, the guide support reset spring 8 extends and releases the spring force, driving the lifting plate 1 to rise and reset to the initial position. As the lifting plate 1 rises and resets, it simultaneously drives the locking vertical bar 16 to rise and reset, at which point the lifting and positioning mechanism as a whole returns to its initial state.

[0038] The solutions in the embodiments are not intended to limit the scope of protection of the present invention. All equivalent implementations or modifications that do not depart from the present invention are included in the scope of protection of the present invention.

Claims

1. A lifting and positioning mechanism that combines mechanical locking and electromagnetic holding, characterized in that: It includes a lifting plate, a base plate, a guide support reset unit, a locking and positioning execution unit, and a distance-triggered proximity switch; the lifting plate is located directly above the base plate and the two are parallel to each other; the guide support reset unit is disposed between the lifting plate and the base plate; the locking and positioning execution unit is disposed between the lifting plate and the base plate; and the distance-triggered proximity switch is disposed on the upper surface of the base plate.

2. The lifting and positioning mechanism with mechanical locking and electromagnetic holding cooperation according to claim 1, characterized in that: The number of guide support reset units is several, and the several guide support reset units are evenly distributed along the circumference of the lifting plate and the base plate.

3. The lifting and positioning mechanism with coordinated mechanical locking and electromagnetic holding according to claim 2, characterized in that: The number of locking and positioning execution units is several, and the several locking and positioning execution units are evenly distributed along the circumference of the lifting plate and the base plate.

4. The lifting and positioning mechanism with coordinated mechanical locking and electromagnetic holding according to claim 3, characterized in that: The guide support reset unit and the locking positioning execution unit are staggered in the circumferential direction.

5. The lifting and positioning mechanism with mechanical locking and electromagnetic holding cooperation according to claim 1, characterized in that: The guide support reset unit includes a guide support shaft, a guide support sleeve, and a guide support reset spring. A first adapter flange is fixedly installed at the top of the guide support shaft, and the top of the guide support shaft is fixedly connected to the lifting plate through the first adapter flange. The bottom end of the guide support shaft passes through the base plate and extends below the base plate. The guide support sleeve is coaxially fitted on the outside of the guide support shaft. A second adapter flange is fixedly installed at the bottom end of the guide support sleeve, and the second adapter flange is located below the base plate. The bottom end of the guide support sleeve is fixedly connected to the base plate through the second adapter flange. The guide support reset spring is coaxially fitted on the outside of the guide support sleeve. The top end of the guide support reset spring is in contact with the first adapter flange, and the bottom end of the guide support reset spring is in contact with the base plate.

6. The lifting and positioning mechanism with coordinated mechanical locking and electromagnetic holding according to claim 5, characterized in that: A buffer sleeve is fitted onto the guide support shaft between the top of the guide support sleeve and the first transition flange.

7. The lifting and positioning mechanism with mechanical locking and electromagnetic holding cooperation according to claim 5, characterized in that: A limit stop is fixedly installed at the bottom end of the guide support shaft.

8. The lifting and positioning mechanism with mechanical locking and electromagnetic holding cooperation according to claim 1, characterized in that: The locking and positioning execution unit includes a base frame, a mechanical locking assembly, a coupling transmission assembly, a cylinder, and an electromagnet. The base frame is located below the base plate, and the top of the base frame is fixedly connected to the base plate. The mechanical locking assembly is disposed between the base frame and the lifting plate. The coupling transmission assembly is disposed between the mechanical locking assembly and the base frame. The cylinder and the electromagnet are both fixedly installed at the bottom of the base frame. The cylinder and the electromagnet are used in conjunction with the coupling transmission assembly. The control ends of the cylinder and the electromagnet are electrically connected to a distance-triggered proximity switch.

9. A lifting and positioning mechanism with coordinated mechanical locking and electromagnetic holding according to claim 8, characterized in that: The mechanical locking assembly includes a locking vertical rod, a locking horizontal rod, a locking guide sleeve, and a locking return spring. The upper end of the locking vertical rod is fixedly connected to the lifting plate via an adjusting positioning nut, and the lower end of the locking vertical rod passes through the base plate and extends below the base plate. A locking ring groove is provided on the lower end of the locking vertical rod. The locking guide sleeve is horizontally mounted and fixed on the base frame. A locking vertical rod through hole is provided vertically on one end of the locking guide sleeve. The locking horizontal rod is coaxially mounted inside the locking guide sleeve. One end of the locking horizontal rod is engaged with the locking ring groove, and the other end of the locking horizontal rod extends to the outside of the locking guide sleeve. A limit baffle is fixedly provided on the rod of the locking horizontal rod located outside the locking guide sleeve. The locking return spring is coaxially mounted on the outside of the locking guide sleeve. One end of the locking return spring is in contact with the base frame, and the other end of the locking return spring is in contact with the limit baffle.

10. A lifting and positioning mechanism with coordinated mechanical locking and electromagnetic holding according to claim 9, characterized in that: The coupling transmission assembly includes a lever, a hinge seat, a force transmission push rod, a universal ball joint, and a magnetic plate. The hinge seat is located below the locking guide sleeve and is fixedly connected to the base frame. The fulcrum of the lever is rotatably connected to the hinge seat via a hinge shaft, and the upper end of the lever abuts against the outer end of the locking crossbar. The force transmission push rod is fixedly installed at the lower end of the lever, and one end of the force transmission push rod abuts against the end of the piston rod of the cylinder. The center of the magnetic plate is connected to the other end of the force transmission push rod via a universal ball joint, and the magnetic plate is attracted and engaged with an electromagnet.

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