Screw electric cylinder lifting platform

Abstract

The application relates to the technical field of lifting platforms, in particular to a screw electric cylinder lifting platform, which comprises a lifting frame installed on a base and provided with sliding rails, a sliding frame slidably connected to the sliding rails of the lifting frame in the vertical direction and provided with a lifting platform, a power member arranged on the lifting frame and connected to the sliding frame at a traction end, used for driving the sliding frame to lift, and an elastic mechanism arranged between the power member and the sliding frame, wherein the elastic mechanism comprises a damper, one end of the damper is connected to the sliding frame, and the other end of the damper is connected to the traction end of the stop piece. The application has the effect of improving safety.

Description

Technical Field

[0001] This application relates to the technical field of lifting platforms, and in particular to a screw electric cylinder lifting platform. Background Technology

[0002] Lifting platforms, as a common type of vertical transportation equipment, are widely used in cargo handling, equipment maintenance, stage lifting, barrier-free access, and can also be used as building elevators. Traditional lifting platforms mostly use hydraulic, chain, or wire rope traction methods to achieve lifting functions, and their structure generally includes a base, lifting frame, loading platform, and power system.

[0003] In the prior art, Chinese Patent Publication No. CN120308790A discloses a three-door elevator system, which arranges the car frame and guide rails on the rear side of the car, with the guide rails externally positioned to optimize the use of shaft space and improve the front-side view. In this design, the car is fixed to the car frame by a lower support member, the guide rails guide the car frame, the counterweight is arranged on the rear side of the car and connected to the car frame by a traction rope, and during operation, a power mechanism drives the traction rope to raise or lower the car.

[0004] However, the connection between the car and the traction rope, or the existing platform, uses a direct rigid connection between the motor or hydraulic cylinder and the platform. During initial startup, the force of the power mechanism acts directly on the car, causing it to move instantaneously. This can result in the car shaking or sudden acceleration, leading to a decrease in safety. Utility Model Content

[0005] To improve safety, this application provides a screw electric cylinder lifting platform.

[0006] This application provides a screw electric cylinder lifting platform, which adopts the following technical solution: A screw electric cylinder lifting platform, comprising: The lifting frame is mounted on the base and equipped with slide rails; A sliding frame is slidably connected to the slide rail of the lifting frame in a vertical direction, and a lifting platform is installed thereon; A power component, mounted on the lifting frame and with its traction end connected to the sliding frame, is used to drive the sliding frame to lift and lower. An elastic mechanism is provided between the power component and the sliding frame. The elastic mechanism includes a damper, one end of which is connected to the sliding frame, and the other end of which is connected to the traction end of the stop component.

[0007] By adopting the above technical solution, when the power component starts, its traction force first acts on the damper in the elastic mechanism; the damper undergoes elastic deformation (compression or tension), storing or dissipating some energy through damping, and then transmitting the mitigated force to the sliding frame, driving the lifting platform to move; when stopping, the reverse process occurs, the damper absorbs the kinetic energy of the sliding frame, reducing the stopping impact; significantly improving the smoothness and comfort of operation: by introducing an elastic buffer in the power transmission path, the impact force at the moment of starting and stopping of the power component is effectively absorbed, reducing the sudden acceleration or deceleration of the lifting platform, making the operation smoother and more stable; alleviating the problem of "shaking or sudden acceleration caused by instantaneous movement" pointed out in the background technology, reducing the risk of platform instability, cargo tipping or personnel discomfort caused by sudden start and stop, which is a fundamental active safety improvement; the buffering effect reduces the instantaneous peak load on the power component, transmission components and lifting frame structure, which helps to extend the overall service life of the equipment.

[0008] Optionally, the resilient mechanism further includes: A wedge shell is slidably disposed on the sliding frame and connected to the other end of the damper; a wedge-shaped space is provided, the area of ​​which gradually increases along the vertical direction towards the base; The connecting wedge block slides within the wedge-shaped space and is connected to the traction end of the power component.

[0009] By adopting the above technical solution, the wedge shell and connecting wedge block are designed to facilitate the installation of the connecting sliding frame and power components. Furthermore, the wedge-shaped structure enhances connection stability and improves safety.

[0010] Optionally, the sliding frame is further provided with a safety mechanism, the safety mechanism including: A fixed tooth is provided on the slide rail and is arranged along the length direction of the slide rail; The guide sleeve is fixedly mounted on the sliding frame; The sliding rod slides horizontally within the guide sleeve; The sliding tooth slides horizontally on the sliding frame and is fixedly connected to the sliding rod, moving closer to or further away from the fixed tooth; An actuating component is disposed on the sliding frame, connected to the sliding tooth, and used to drive the sliding tooth to slide.

[0011] By adopting the above technical solution, under normal circumstances, the actuator controls the sliding teeth not to engage with the fixed teeth, allowing the platform to rise and fall freely. When locking is required or an abnormality occurs (such as power failure or malfunction), the actuator moves, pushing the sliding teeth horizontally to engage with the fixed teeth on the slide rail. This mechanical interference between the teeth prevents the sliding frame (and lifting platform) from falling. It does not rely on electric or hydraulic power sources and can be automatically or passively triggered in the event of power failure, mechanically locking the lifting platform in its current position. This is the last and most reliable physical barrier to prevent the platform from falling accidentally. The existence of this mechanism itself is an important safety feature, greatly improving the safety of the equipment in abnormal situations and meeting the core safety requirements of lifting equipment. The safety mechanism operates independently of the main lifting power system, and its reliability is not affected by main system failures. Furthermore, this structure allows the lifting platform to hover at any floor, and when no one is operating it, it does not need to descend to the lowest floor, reducing energy consumption.

[0012] Optionally, the execution component includes: A return spring, disposed on the guide sleeve and connected to the sliding rod, is used to drive the sliding rod closer to the fixed tooth; A guide plate is provided on the slide rail and is arranged along the length of the slide rail, and multiple clearance grooves are provided. An abutment bar, provided on the sliding rod, is shorter than the length of the clearance groove and can slide into the clearance groove; It also includes an ejection component disposed at the clearance groove for ejecting the abutment bar from the clearance groove.

[0013] By adopting the above technical solution, during normal lifting, the sliding frame drives the abutment bar to slide along the guide plate. When the abutment bar moves to align with the clearance groove, under the action of the return spring, the sliding rod quickly drives the abutment bar to insert into the clearance groove, and at the same time, the sliding teeth engage the fixed teeth to achieve "step-by-step" locking or trigger locking. The ejection component can push the abutment bar out of the clearance groove when it is necessary to release the lock (such as after power is restored), and under the action of the return spring, the sliding teeth disengage from the fixed teeth.

[0014] The clearance slot provides a clear positioning point for safety locking, and the platform can be reliably locked at any preset clearance slot position (usually with equal spacing), not just at the end of the stroke; the return spring provides the power for the sliding teeth to engage quickly, ensuring that the locking action is timely and decisive.

[0015] By introducing components, remote or automatic control release of safety mechanisms can be achieved, enabling the equipment to resume normal operation after troubleshooting, thereby improving the maintainability, availability, and security of the equipment.

[0016] Optionally, the ejection component includes: A sealing plate is slidably mounted on the guide plate to block the clearance groove, and its edges are chamfered. A driving component, disposed on the abutment strip and connected to the sealing plate, is used to drive the sealing plate to slide.

[0017] By adopting the above technical solution, when the lock needs to be released, the drive unit moves, pushing the sealing plate to move. The chamfered edge of the sealing plate contacts the abutment strip located in the clearance groove, smoothly pushing it out of the clearance groove. The design of the sealing plate and its chamfer makes the release action smooth, reducing jamming or impact on the abutment strip and sliding rod, ensuring the reliability of the release process. When the sealing plate is not released, it blocks the clearance groove, which can prevent the abutment strip from accidentally entering the clearance groove due to vibration or other reasons during normal lifting and lowering, thus preventing unnecessary locking and ensuring the continuity of normal operation. The specific structure of the push-out component has been optimized, making the release operation more reliable and adding a "preventing accidental triggering" safety function.

[0018] Optionally, a trigger rod that links the safety mechanism is also provided between the elastic mechanism and the sliding frame. One end of the trigger rod is connected to the wedge shell, and the other end abuts against the actuation component. When the elastic mechanism is stretched, the trigger rod can trigger the actuation component to separate the sliding tooth from the fixed tooth.

[0019] By adopting the above technical solution, when starting, the elastic mechanism stretches and drives the trigger rod to slide, so that the fixed tooth and the interactive tooth separate, which facilitates automatic unlocking. At the same time, it can reduce the pressure at the ejection component and reduce the occurrence of the elevator being unable to unlock after a component failure.

[0020] Optionally, it further includes a braking mechanism, the braking mechanism comprising: A fixing block is installed on the sliding frame, and a braking groove is opened on the side near the slide rail. The width of the braking groove is greater than the width of the slide rail, and the slide rail is located in the braking groove. A brake wedge is disposed on the inner wall of the brake groove, and the upper end of the wedge surface is inclined close to the slide rail; A guide block is disposed on the fixed block, and a guide groove is formed along the opening direction of the wedge surface; The brake wheel rolls within the brake groove and along the wedge surface, and when it is located at the lower end of the wedge surface, there is a gap between it and the slide rail. A brake column is coaxially connected to the brake wheel and slides within the guide groove; An overspeed regulator is mounted on the lifting frame and connected to the brake column.

[0021] By adopting the above technical solution, at normal speeds, the overspeed regulator (which can be considered a speed sensing device, such as a centrifugal speed controller) does not activate. The brake pin is located at the lower part of the guide groove, and the brake wheel is located at the lower end of the inclined surface of the brake wedge, maintaining a gap with the slide rail, allowing the platform to move freely. When the sliding frame's descent speed exceeds the set value, the overspeed regulator is triggered, pulling or pushing the brake pin upwards along the guide groove. The brake pin drives the brake wheel to roll upwards along the inclined surface of the brake wedge. Due to the wedge surface design, as the brake wheel rolls upwards, it is squeezed by the inclined surface towards the slide rail, eventually making frictional contact with the slide rail, generating braking force. The faster the speed, the greater the force of the overspeed regulator may be, and the greater the force that the brake wheel is pressed against the slide rail, forming positive feedback to achieve deceleration or braking.

[0022] This invention provides a speed-monitoring-based braking scheme independent of the power system and safety locking mechanism. It is not a simple "on-off" locking mechanism, but rather applies proportional braking based on the degree of overspeed, resulting in a smoother and more controllable braking process. The braking action is triggered by a mechanical overspeed regulator, independent of external power supply, and highly reliable. It primarily prevents downward overspeed (fall) and serves as an important supplement to the fall arrest mechanism. The locking mechanism provides a "final static lock," while the braking mechanism provides "dynamic deceleration during the process," and the combination of the two constitutes a more comprehensive fall arrest system.

[0023] Optionally, the sliding frame has a horizontal groove, and a locking bolt passes through the groove. One end of the locking bolt passes through the groove and is threadedly connected to the fixing block.

[0024] By adopting the above technical solution, the position of the fixing block can be easily adjusted through the cooperation of the locking bolt and the waist groove, the initial gap between the brake wheel and the slide rail can be adjusted, the trigger sensitivity and braking force can be easily adjusted, and the applicability and safety can be further improved.

[0025] Optionally, it also includes an overspeed mechanism, which has the same structure as the braking mechanism and is mirror-image of the braking mechanism on the sliding frame along the horizontal plane.

[0026] By adopting the above technical solutions, the overspeed mechanism and braking mechanism are designed to facilitate braking and locking during both overspeeding and overspeeding, thereby further improving safety.

[0027] Optionally, the power component includes a screw electric cylinder and a guide wheel assembly. The screw electric cylinder is mounted on the lifting frame, and the movable end of the screw electric cylinder is connected to the sliding frame through the guide wheel assembly.

[0028] By adopting the above technical solutions, the screw electric cylinder provides precise and stable linear thrust or pull, which is then transmitted to the sliding frame after being redirected by the guide wheel assembly (such as pulleys, wire ropes / strips). The guide wheel assembly can distribute the force points and achieve smooth traction; the screw electric cylinder itself has advantages such as high control precision, smooth operation, and good self-locking, providing an excellent basic power source for the lifting platform; the smooth screw electric cylinder drive, combined with elastic buffering, can achieve extremely smooth motion control throughout the entire process from the power source to the load end.

[0029] In summary, this application includes at least one of the following beneficial technical effects: 1. By introducing an elastic buffer in the power transmission path, the impact force at the moment of starting and stopping of the power components is effectively absorbed, reducing the sudden acceleration or deceleration of the lifting platform and making the operation smoother and more stable. 2. During startup, the elastic mechanism stretches and drives the trigger rod to slide, causing the fixed tooth and the interactive tooth to separate, which facilitates automatic unlocking. At the same time, it can reduce the pressure at the ejection component and reduce the occurrence of the elevator failing to unlock after a component failure. 3. The screw electric cylinder itself has the advantages of high control precision, stable operation and good self-locking, providing an excellent basic power source for the lifting platform; the stable screw electric cylinder drive, combined with elastic buffer, can achieve extremely smooth motion control from the power source to the load end. Attached Figure Description

[0030] Figure 1 This is an overall structural diagram of the lifting platform in Embodiment 1 of this application; Figure 2 This is a structural diagram of the sliding frame in Embodiment 1 of this application; Figure 3 This is a diagram illustrating the wedge shell in Embodiment 1 of this application; Figure 4 This is a cross-sectional view of the screw electric cylinder in Embodiment 1 of this application; Figure 5 This is a diagram illustrating the security mechanism in Embodiment 2 of this application; Figure 6 This is a detailed illustration of the specific structure of the safety mechanism in Embodiment 2 of this application; Figure 7 This is a diagram illustrating the braking mechanism in Embodiment 3 of this application; Figure 8 This is a three-dimensional view of the fixing block in Embodiment 3 of this application.

[0031] Reference numerals: 100, Lifting frame; 200, Slide rail; 300, Sliding frame; 310, Lifting platform; 400, Power component; 410, Screw cylinder; 411, Motor; 412, Lead screw; 413, Slider; 420, Guide wheel assembly; 421, Pulley; 422, Traction rope; 423, Connecting frame; 500, Elastic mechanism; 510, Damper; 520, Wedge shell; 521, Wedge-shaped space; 530, Connecting wedge block; 540, Fixed frame; 550, Sliding rod; 600, Safety mechanism; 610, Fixed tooth ; 620, Guide sleeve; 630, Slide rod; 640, Sliding tooth; 650, Actuating component; 651, Return spring; 652, Guide plate; 653, Abutment bar; 654, Clearance groove; 660, Push-out component; 661, Sealing plate; 662, Driving component; 670, Trigger rod; 680, Driving block; 690, Actuating block; 700, Braking mechanism; 710, Fixing block; 711, Braking groove; 730, Guide block; 731, Guide groove; 740, Brake wheel; 750, Brake column; 770, Overspeed regulator. Detailed Implementation

[0032] The following combination Figures 1 to 8 This application will be described in further detail.

[0033] This embodiment discloses a screw electric cylinder lifting platform.

[0034] Example 1: Refer to Figures 1 to 4 The screw electric cylinder 410 lifting platform includes a base, a lifting frame 100 mounted on the base, a slide rail 200 mounted on the lifting frame 100, a sliding frame 300 slidably mounted on the slide rail 200, a power component 400 mounted on the lifting frame 100, an elastic mechanism 500 mounted between the sliding frame 300 and the power component 400, and a lifting platform 310 mounted on the sliding frame 300. When the lifting platform 310 moves, the power component 400 drives the elastic mechanism 500 to extend, and then drives the sliding frame 300 to move smoothly to the same speed as the set running speed of the power component 400.

[0035] The lifting frame 100 is fixedly installed on the base. Its main frame has at least two parallel slide rails 200 arranged vertically to provide precise guidance for lifting movements. The sliding frame 300 is slidably connected to the slide rails 200 of the lifting frame 100 through a slider 413 or a sliding sleeve, so that it can be smoothly lifted and lowered in the vertical direction. The lifting platform 310 is fixedly installed on the sliding frame 300 and is used to carry goods or personnel.

[0036] The power unit 400 provides the power required for lifting, and it is preferably a screw cylinder 410. The screw cylinder 410 is fixedly installed on the top or bottom of the lifting frame 100, preferably at the bottom in this embodiment. The screw cylinder 410 contains a motor 411, a lead screw 412 driven by the motor 411, and a slider 413 (or nut) threadedly connected to it. The slider 413 is slidably connected to the cylinder body of the screw cylinder 410 and slides along the length of the cylinder body. When the motor 411 is working, it drives the lead screw 412 to rotate, causing the slider 413 to move linearly along the axis of the lead screw 412. To accommodate the layout and transmit power, the movable end (i.e., the slider 413) of the screw cylinder 410 is connected to a guide wheel assembly 420. The guide wheel assembly 420 typically includes a fixed connecting frame 423, pulleys 421, and a traction rope 422. The connecting frame 423 is fixedly connected to the movable end of the screw electric cylinder 410. The pulleys 421 are fixed pulleys and are provided in two sets, with multiple pulleys in each set. One set is rotatably located near the fixed end of the screw electric cylinder 410, and the other set is rotatably located near the movable end of the screw electric cylinder 410 and connected to the connecting frame 423. One end of the traction rope 422 is connected to one side of the fixed end of the screw electric cylinder 410, and the other end passes around multiple fixed pulleys and is connected to the elastic mechanism 500. Its function is to change the direction of the linear power generated by the screw electric cylinder 410 and transmit it to the force-bearing point of the sliding frame 300 to achieve smooth traction.

[0037] The elastic mechanism 500 connects the traction end of the power component 400 (i.e., the other end of the traction rope 422) to the sliding frame 300, serving as a crucial buffer. This elastic mechanism 500 includes a damper 510, which can be a pneumatic rod, hydraulic rod, or high-performance shock-absorbing spring, among other components with damping and elastic reset functions. The lower end (piston rod end or equivalent end) of the damper 510 is hinged or fixedly connected to the sliding frame 300; in this embodiment, the lower end of the damper 510 is fixedly connected to the sliding frame 300.

[0038] To adapt the buffering performance to different loads and impact conditions, the elastic mechanism 500 also includes a wedge shell 520, a connecting wedge block 530, a fixing frame 540, and a sliding rod 550. The fixing frame 540 is fixedly connected to the sliding frame 300, and the sliding rod 550 slides vertically on the fixing frame 540. One end of the sliding rod 550 is connected to the damper 510, and the other end is connected to the wedge shell 520. A wedge-shaped space 521 is formed inside the wedge shell 520. The cross-sectional area of ​​this space gradually increases vertically (e.g., from bottom to top), forming a sloping guide structure. The connecting wedge block 530 is slidably embedded in the wedge-shaped space 521, and its outer sloping surface is in contact with the inner wall of the wedge-shaped space 521. The upper end of the connecting wedge block 530 is fixedly connected to the traction end of the power component 400.

[0039] The implementation principle of Embodiment 1 of this application is as follows: During operation, when the screw cylinder 410 is activated to lift the sliding frame 300, the power of the motor 411 is transmitted to the connecting wedge 530 via the lead screw 412, slider 413, and guide wheel assembly 420. The connecting wedge 530 first generates relative motion within the wedge-shaped space 521 and stretches the damper 510. The damper 510 undergoes elastic deformation, absorbing and mitigating the initial lifting force, and then transmits the steadily increasing force to the sliding frame 300 through the wedge shell 520, causing the lifting platform 310 to rise smoothly and rapidly. Through the cooperation of the wedge structure, when the load is large, the connecting wedge 530 is pressed deeper within the wedge-shaped space 521, and the inclined plane effect makes the mechanism more "rigid," providing greater support force; when the load is small, the buffering is more gentle, achieving adaptive buffering. In summary, this embodiment provides precise power through the screw electric cylinder 410 and, combined with an adaptive elastic buffer mechanism, effectively eliminates the instantaneous impact during start-up and stopping, greatly improving operational smoothness, ride comfort, and equipment lifespan, thus forming the foundation of a highly safe lifting platform. Example

[0040] Reference Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 is that a mechanical safety mechanism 600 and its intelligent unlocking linkage mechanism are further added to prevent the platform from falling accidentally.

[0041] The safety mechanism 600 includes a fixing tooth 610, which is fixedly connected to the slide rail 200 of the lifting frame 100 on the side facing the sliding frame 300. The fixing tooth 610 is elongated and vertically arranged. In other embodiments, the fixing tooth 610 can be multi-segmented and installed at the position where suspension is required. Two fixing teeth 610 are located on the side of the two slide rails 200 that are close to each other, and they extend along the entire length of the slide rails 200. On the sliding frame 300, a guide sleeve 620 is fixedly installed at the position corresponding to the fixing tooth 610. A sliding rod 550 is horizontally inserted and slidable inside the guide sleeve 620, and can slide in the horizontal direction. One end of the sliding rod 550 is fixedly connected to a sliding tooth 640, which is also horizontally slidably arranged on the sliding frame 300 via the guide rail. Its tooth shape matches the fixing tooth 610 on the slide rail 200, and can engage or disengage.

[0042] In other embodiments, the safety mechanism 600 further includes an actuation component 650 and an ejection component 660. The actuation component 650 is used to control the movement of the sliding tooth 640 and includes a return spring 651, a guide plate 652, and an abutment strip 653. The guide sleeve 620 has a sliding hole and a limiting hole, which are connected. The diameter of the limiting hole is larger than that of the sliding hole. The sliding rod 550 slides in the sliding hole, and a limiting plate that slides in the limiting hole is fixedly connected to the sliding rod 550. The return spring 651 is sleeved on the sliding rod 550 and fixed in the limiting hole of the guide sleeve 620. One end of the return spring 651 is connected to the bottom of the limiting hole, and the other end is connected to the limiting plate. Its elastic force always pushes the sliding rod 550 and the sliding tooth 640 to move closer to the fixed tooth 610, that is, tends to lock. A long strip-shaped guide plate 652 is fixedly mounted on the slide rail 200, parallel to the fixed tooth 610. Multiple vertical clearance grooves 654 are evenly spaced along the length of the guide plate 652. A stop bar 653 is fixedly mounted on the sliding rod 550; the width of the stop bar 653 is less than the length of the clearance grooves 654 on the guide plate 652. In normal lifting and lowering mode, the sliding frame 300 moves, causing the stop bar 653 to slide along the plane of the guide plate 652. An ejector assembly 660 is mounted on the slide rail 200 and connected to the stop bar 653, used to move the stop bar 653.

[0043] When the platform needs to hover or when power fails, the sliding frame 300 moves to a position where the abutment bar 653 aligns with a certain clearance groove 654. At this time, under the action of the return spring 651, the sliding rod 550 is quickly pushed towards the fixed tooth 610, causing the abutment bar 653 to insert into the clearance groove 654. At the same time, the sliding tooth 640 meshes with the fixed tooth 610, using the inter-tooth interference to mechanically lock the sliding frame 300 in this position, realizing a "step-by-step" safe parking at any floor. When it needs to be pulled out, the push-out component 660 drives the abutment bar 653 to be pulled out of the clearance groove 654.

[0044] An ejection assembly 660, used to unlock when needed, is located in the clearance groove 654 of the guide plate 652. The ejection assembly 660 includes a sealing plate 661 and a drive member 662. The sealing plate 661 is slidably disposed inside the guide plate 652 and can move laterally to block or open the clearance groove 654. The edge of the sealing plate 661 near the clearance groove 654 is chamfered, and the side of the clearance groove 654 near the abutment strip 653 is also chamfered. The drive member 662 is a miniature electromagnet or a miniature electric cylinder; in this embodiment, a miniature electromagnet is preferred. It is fixedly mounted on the sliding frame 300, and its actuating end is connected to the sealing plate 661. When an unlocking signal is received, the drive member 662 actuates, pulling the sealing plate 661 laterally. As the sealing plate 661 moves, its chamfered edge contacts and presses against the abutment strip 653 located in the clearance groove 654, smoothly ejecting it from the clearance groove 654 using the inclined surface. Once the abutment bar 653 disengages from the clearance groove 654, the sliding tooth 640 disengages from the fixed tooth 610, and the lock is released.

[0045] To further enhance the intelligence level of the safety system, a linkage device is installed between the elastic mechanism 500 and the safety mechanism 600. Specifically, a trigger rod 670 is added, the upper end of which is fixedly connected to the wedge shell 520. The trigger rod 670 is horizontally positioned and slides vertically on the sliding frame 300. A drive block 680 is fixedly connected to the end of the trigger rod 670. The cross-section of the drive block 680 is triangular, and the inclination direction of the inclined surface of the drive block 680 is the same as the opening direction of the wedge surface of the connecting wedge block 530. An actuating block 690 is fixedly connected to the abutment bar 653, and the actuating block 690 is located on the inclined surface of the drive block 680. There is a gap of 1-5 mm above. When the drive block 680 moves upward with the wedge shell 520, the drive block 680 pushes the actuator block 690 away from the fixed tooth 610. When the platform is in the normal lifting state, the damper 510 in the elastic mechanism 500 is stretched, the wedge shell 520 moves upward, which pushes the trigger rod 670 to swing. The trigger rod 670 drives the drive block 680 to slide, so that the abutment bar 653 moves away from the guide plate 652, and the sliding tooth 640 separates from the fixed tooth 610, thus unlocking.

[0046] Example 3: Reference Figure 7 and Figure 8 Based on Embodiment 1 or 2, this embodiment further adds a progressive braking mechanism 700 to prevent the platform from overspeeding (especially overspeeding during descent and falling).

[0047] The braking mechanism 700 is independent of the power system and safety mechanism 600, and is a speed-sensing mechanical braking device. Its main body is a fixed block 710, which is mounted on the side of the sliding frame 300 via an adjustment structure. Specifically, two oblong holes (grooves) are horizontally formed on the sliding frame 300, and a locking bolt passes through these grooves and is threadedly connected to the fixed block 710. After loosening the locking bolt, the fixed block 710 can be moved horizontally along the grooves, adjusted, and then the bolt can be tightened to fix it, thereby achieving fine-tuning of the horizontal position.

[0048] A brake groove 711 is provided on the side of the fixing block 710 near the slide rail 200. The width of the brake groove 711 is greater than the thickness of the slide rail 200, allowing the slide rail 200 to pass through it with gaps on both sides. A brake wedge (not shown in the figure) is integrally formed and installed on the inner wall of the brake groove 711. The brake wedge has an inclined wedge surface, the upper end (i.e., the high end) of which is inclined towards the slide rail 200. A guide block 730 is also fixed to the fixing block 710. An inclined guide groove 731 is provided on the guide block 730, and the extension direction of the guide groove 731 is parallel to the wedge surface of the brake wedge.

[0049] The brake pin 750 is slidably inserted into the guide groove 731. One end of the brake pin 750 is located within the brake groove 711 and coaxially mounted with a brake wheel 740 (such as a roller or bearing), while the other end extends out of the guide groove 731 for connection to a speed sensing device. The brake wheel 740 is located within the brake groove 711 and can roll along the wedge surface of the brake wedge. By adjusting the horizontal position of the fixing block 710, a small initial gap can be maintained between the brake wheel 740 and the side of the slide rail 200 when the brake pin 750 is at the lowermost end of the guide groove 731, ensuring no friction during normal operation.

[0050] The speed sensing device is a mechanical overspeed regulator 770 (such as a centrifugal speed governor), which is installed in a fixed position such as the top or bottom of the lifting frame 100. The trigger output terminal of the overspeed regulator 770 is connected to the outer end of the brake column 750 via a steel wire rope or connecting rod.

[0051] When the platform is running at normal speed, the overspeed regulator 770 does not activate. The brake pin 750, under its own weight or the action of an auxiliary spring, is positioned at the lower end of the guide groove 731, and the brake wheel 740 remains at the lower end of the wedge surface, without contact with the slide rail 200, allowing the platform to rise and fall freely. Once the platform's downward speed exceeds the preset safety value, the overspeed regulator 770 is quickly triggered, pulling the brake pin 750 upward via a steel cable or connecting rod. The brake pin 750 slides upward along the inclined guide groove 731, simultaneously causing the brake wheel 740 to roll upward along the inclined surface of the brake wedge. Due to the wedge surface design, as the brake wheel 740 moves upward, it is forcefully squeezed towards the slide rail 200, generating significant frictional pressure with the side of the slide rail 200, thus creating braking force. The faster the speed, the greater the triggering force of the overspeed regulator 770, the tighter the brake wheel 740 is pressed, and the greater the braking force, forming a positive feedback progressive braking process until the platform safely decelerates or stops.

[0052] In other embodiments, to further ensure the smoothness and balance of the braking process and avoid tilting of the sliding frame 300 due to unilateral braking, another set of overspeed mechanisms with the same structure can be installed mirror-symmetrically on the other side of the same slide rail 200 of the sliding frame 300 or on another slide rail 200. The stop groove and guide groove 731 of the overspeed mechanism are both set in the opposite direction to the braking mechanism 700. The overspeed adjuster 770 is connected to the side of the guide column near the ground. The two sets of mechanisms work together, wherein the braking mechanism 700 is used for downward overspeed braking and the overspeed mechanism is used for upward overspeed braking.

[0053] In summary, the braking mechanism 700 provided in this embodiment achieves progressive braking by mechanically sensing overspeed and utilizing the wedge principle. It complements the safety locking mechanism (static locking) in Embodiment 2, together constructing a dual anti-fall safety system of "dynamic deceleration" and "static locking", which greatly improves the safety guarantee capability of the lifting platform under abnormal overspeed conditions.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A screw electric cylinder lifting platform, characterized in that: include: A lifting frame (100) is mounted on a base and is equipped with a slide rail (200). The sliding frame (300) is slidably connected to the slide rail (200) of the lifting frame (100) in the vertical direction, and is equipped with a lifting platform (310). A power component (400) is mounted on the lifting frame (100) and its traction end is connected to the sliding frame (300) for driving the sliding frame (300) to rise and fall. An elastic mechanism (500) is provided between the power component (400) and the sliding frame (300). The elastic mechanism (500) includes a damper (510). One end of the damper (510) is connected to the sliding frame (300), and the other end of the damper (510) is connected to the traction end of the power component (400).

2. The screw electric cylinder lifting platform according to claim 1, characterized in that: The elastic mechanism (500) further includes: A wedge shell (520) is slidably disposed on the sliding frame (300) and connected to the other end of the damper (510); a wedge-shaped space (521) is provided, the area of ​​the wedge-shaped space (521) gradually increases in the direction of the vertical direction close to the base; The connecting wedge (530) slides within the wedge-shaped space (521) and is connected to the traction end of the power unit (400).

3. The screw electric cylinder lifting platform according to claim 2, characterized in that: The sliding frame (300) is also provided with a safety mechanism (600), which includes: A fixed tooth (610) is provided on the slide rail (200) and is provided along the length direction of the slide rail (200); The guide sleeve (620) is fixedly mounted on the sliding frame (300); The sliding rod (550) slides horizontally within the guide sleeve (620); The sliding tooth (640) slides horizontally on the sliding frame (300) and is fixedly connected to the sliding rod (550), moving closer to or further away from the fixed tooth (610). An actuation component (650) is disposed on the sliding frame (300), connected to the sliding tooth (640), and used to drive the sliding tooth (640) to slide.

4. The screw electric cylinder lifting platform according to claim 3, characterized in that: The execution component (650) includes: A return spring (651) is disposed on the guide sleeve (620) and connected to the sliding rod (550) to drive the sliding rod (550) closer to the fixed tooth (610). A guide plate (652) is provided on the slide rail (200) and is provided along the length direction of the slide rail (200), and multiple clearance grooves (654) are provided. An abutment bar (653) is provided on the sliding rod (550), and is shorter than the length of the relief groove (654), and can slide into the relief groove (654). It also includes a push-out component (660) disposed at the clearance groove (654) for pushing the abutment bar (653) out of the clearance groove (654).

5. The screw electric cylinder lifting platform according to claim 4, characterized in that: The ejection component (660) includes: A sealing plate (661) is slidably disposed on the guide plate (652) for blocking the clearance groove (654), and its edges are chamfered; A driving component (662) is disposed on the abutment strip (653) and connected to the sealing plate (661) for driving the sealing plate (661) to slide.

6. The screw electric cylinder lifting platform according to claim 5, characterized in that: A trigger rod (670) that links the safety mechanism (600) is also provided between the elastic mechanism (500) and the sliding frame (300). One end of the trigger rod (670) is connected to the wedge shell (520), and the other end abuts against the execution component (650). When the elastic mechanism (500) is stretched, the trigger rod (670) can trigger the execution component (650) to separate the sliding tooth (640) from the fixed tooth (610).

7. The screw electric cylinder lifting platform according to claim 1, characterized in that: It also includes a braking mechanism (700), which includes: A fixing block (710) is installed on the sliding frame (300), and a braking groove (711) is opened on the side near the slide rail (200). The width of the braking groove (711) is greater than the width of the slide rail (200), and the slide rail (200) is located in the braking groove (711). A brake wedge is provided on the inner wall of the brake groove (711), and the upper end of the wedge surface is inclined close to the slide rail (200); A guide block (730) is disposed on the fixed block (710) and a guide groove (731) is formed along the opening direction of the wedge surface. The brake wheel (740) rolls within the brake groove (711) and along the wedge surface, and when it is located at the lower end of the wedge surface, there is a gap between it and the slide rail (200); The brake column (750) is coaxially connected to the brake wheel (740) and slides within the guide groove (731); An overspeed regulator (770) is mounted on the lifting frame (100) and connected to the brake column (750).

8. The screw electric cylinder lifting platform according to claim 7, characterized in that: The sliding frame (300) has a horizontal groove, and a locking bolt is inserted in the groove. One end of the locking bolt passes through the groove and is threadedly connected to the fixing block (710).

9. The screw electric cylinder lifting platform according to claim 7, characterized in that: It also includes an overspeed mechanism, which has the same structure as the braking mechanism (700) and is mirror-image of the braking mechanism (700) on the sliding frame (300) along the horizontal plane.

10. The screw electric cylinder lifting platform according to claim 1, characterized in that: The power unit (400) includes a screw electric cylinder (410) and a guide wheel assembly (420). The screw electric cylinder (410) is mounted on the lifting frame (100), and the movable end of the screw electric cylinder (410) is connected to the sliding frame (300) through the guide wheel assembly (420).

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