Hydraulic lifting platform with protective structure

Abstract

The invention discloses a hydraulic lifting platform with a protective structure. The hydraulic lifting platform comprises a vertical frame, a guide rail, a platform body, a hydraulic cylinder and a protection assembly. The protection assembly is composed of an auxiliary rail, a sliding frame, a bow plate, a positioning column and a connecting rod assembly. The auxiliary rail is matched with the positioning groove through the T-shaped section to achieve stable sliding and multi-point positioning. The sliding frame and the hydraulic cylinder are in linkage to drive the connecting rod assembly to be automatically locked and prevent the table body from falling rapidly when the hydraulic cylinder fails. The auxiliary wheels are matched with the guide rails, so that the moving stability of the table body is improved, and the bearing pressure of the hydraulic cylinder is dispersed; the safety and reliability of hydraulic lifting can be enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical lifting equipment, and in particular relates to a hydraulic lifting platform with a protective structure. Background Art

[0002] Hydraulic lifting platforms are widely used in industrial production, warehousing logistics and daily operations. They are usually driven by the extension and retraction of hydraulic cylinders to move the platform up and down, thereby achieving the up and down movement of the platform or goods. In the existing technology, most hydraulic lifting platforms mainly rely on hydraulic systems to provide power and support. Once the hydraulic cylinder or oil circuit fails, such as oil seal damage, oil pipe rupture or hydraulic cylinder leakage, the platform may lose effective support, causing the platform to fall sharply, which will not only affect the operating efficiency, but also pose a serious safety hazard.

[0003] In order to reduce the above risks, some hydraulic lifting platforms are equipped with simple mechanical locking devices or supporting devices in their structures to temporarily fix the platform during the lifting process. However, most existing mechanical locking structures require manual operation or can only work when the platform is in a specific position. It is difficult to achieve real-time linkage during the movement of the platform, and it is easily restricted by the load of the platform or the installation space when locking or unlocking, resulting in the platform moving unsteadily. In addition, existing fixing or locking devices are often unable to automatically maintain the position of the platform after the hydraulic cylinder stops working. Once the hydraulic system fails, the platform cannot be further protected, and there is still a risk of accidental falling.

[0004] In addition, although some hydraulic lifting platforms are equipped with auxiliary rails or wheels to improve their moving stability, they lack a linkage device that can quickly and reliably complete positioning and provide emergency protection in the event of a hydraulic cylinder failure when the platform position needs to be frequently adjusted or multiple positioning is achieved in a large lifting stroke. If the platform position is maintained solely by the support of the hydraulic cylinder itself, the working intensity of the hydraulic cylinder will increase, and once a failure occurs, it is likely to cause the platform to suddenly sink or fall. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a hydraulic lifting platform with a protective structure, which can realize the positioning and protection of the platform body through the linkage structure and effectively prevent the platform body from falling sharply when the hydraulic system fails.

[0006] To achieve the above object, the present invention provides the following technical solutions: A hydraulic lifting platform with a protective structure comprises a vertical frame, wherein the vertical frame comprises two longitudinal beams arranged opposite to each other, and transverse beams are arranged between the longitudinal beams at equal intervals along the height direction thereof; A guide rail is fixedly connected to the outer side of the longitudinal beam; A platform is slidably connected between the guide rails, and a hydraulic cylinder is arranged at the bottom of the platform to control the lifting height of the platform; A protection assembly is provided between the guide rails, and the protection assembly includes an auxiliary rail fixedly connected between the longitudinal beam and the guide rail, the number of the auxiliary rails is set to two, and the two auxiliary rails are arranged opposite to each other, a sliding frame is slidably connected between the auxiliary rails, the lower end surface of the sliding frame is connected to a bow plate, and a positioning column is inserted on the sliding frame, and the bottom end of the positioning column is connected to the telescopic end of the hydraulic cylinder; The positioning column is connected with a connecting rod assembly, and the connecting rod assembly is used to lock the sliding frame at any height of the auxiliary rail.

[0007] Furthermore, the cross section of the auxiliary rail is set to be T-shaped, and positioning grooves are provided on the outer side of the auxiliary rail at equal intervals along the height direction thereof; The sliding frame comprises a weighing beam, both ends of which are fixedly connected with side beams, and the outer sides of the side beams are provided with clamping grooves, which are clamped on the auxiliary rails.

[0008] Further, the connecting rod assembly includes a driving rod rotatably connected to the bottom of the positioning column, and the other end of the driving rod is rotatably connected to the inner side of the side beam; The lower end surface of the driving rod is rotatably connected to a driven rod, and the other end of the driven rod is rotatably connected to a positioning pin; One end of the dowel pin passes through the side member.

[0009] Furthermore, a plug-in slot is provided through the outer side of the lower end of the side beam, and the positioning pin extends into the plug-in slot; One end of the positioning pin is provided with a cone head, which is inserted into the positioning groove.

[0010] Furthermore, a positioning hole is provided through the center of the top of the weighing beam, and the positioning column passes through the positioning hole; A first pin connection seat is fixedly connected to the inner side of the side beam, and a second pin connection seat is arranged at the bottom end of the positioning column; The two ends of the driving rod are respectively connected to the second pin connection seat and the first pin connection seat; A third pin connection seat is arranged on the driving rod, and one end of the driven rod is connected to the third pin connection seat.

[0011] Furthermore, the platform body includes a platform frame, and a platform plate is fixedly connected to the outer side of the platform frame; The side surface of the weighing beam is symmetrically fixedly connected with a second connecting plate, and the second connecting plate is fixedly connected to the platform.

[0012] Furthermore, diagonal braces are symmetrically and fixedly connected between the table top and the stand; Auxiliary wheels are symmetrically arranged on the back of the platform, and the auxiliary wheels include a wheel seat, one side of the wheel seat is symmetrically rotatably connected to the wheel body, and the other side is fixedly connected to the first connecting plate, the side of the first connecting plate is symmetrically fixedly connected to the first fixing hole, and the first connecting plate is fixedly connected to the platform by bolts.

[0013] Furthermore, the bottom of the longitudinal beam is fixedly connected with a first fixing seat; A connecting angle piece is fixedly connected between the longitudinal beam and the guide rail, and the auxiliary rail is fixedly connected to the connecting angle piece. Furthermore, the shape of the bow plate is set to be an arch shape, and second fixing holes are symmetrically opened at both ends of the bow plate, and the bow plate is fixed to the weighing beam by screws.

[0014] Furthermore, a second fixing seat is arranged at the bottom of the hydraulic cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial effects: By setting relatively distributed auxiliary rails between the longitudinal beam and the guide rail and using T-section matching positioning grooves, the sliding frame can slide smoothly on the auxiliary rails; combined with the mutual engagement between the cone head of the positioning pin and the positioning groove, when the hydraulic cylinder stops working or fails, the connecting rod assembly and the positioning column are used to automatically lock the sliding frame; this solution effectively solves the risk of the platform body falling sharply due to the failure of the hydraulic cylinder mentioned in the background technology; through the close cooperation of the positioning pin and the positioning groove, the safety protection of the platform body during the movement is enhanced.

[0016] By arranging a bow plate on the lower end surface of the sliding frame and connecting a positioning column to the bow plate, the positioning column is used to push the bow plate to apply force to the driving rod, thereby realizing the optional locking of the sliding frame at multiple positions on the auxiliary rail; this structure provides a perfect solution to the problem of the inability to perform reliable positioning during the lifting process mentioned in the background technology; the arc-shaped force dispersion of the bow plate reduces the burden on the hydraulic cylinder, and provides additional support when the hydraulic cylinder leaks or the pressure is insufficient.

[0017] The auxiliary wheels are symmetrically arranged on the back of the platform and the rolling support is realized by the guide rail, which effectively improves the stable movement performance of the platform. The design improves the shortcomings of the background technology that the platform is prone to shaking or deviation when adjusting the position. The rolling connection between the wheel seat and the wheel body greatly reduces the friction resistance when the platform moves between the longitudinal beams, thereby ensuring the working efficiency and reducing the working intensity of the hydraulic cylinder in frequent lifting or lateral movement operations.

[0018] By adopting high-strength welding and bolt anchoring between the frame, the crossbeam and the connecting angle pieces, and arranging a first fixing seat at the bottom of the longitudinal beam for stable support, the problem of overall vibration or tilting of the equipment caused by unstable frame structure in the background technology is solved; this fixing method combined with the T-shaped structure of the auxiliary rail not only meets the needs of multiple lifting and lateral movement, but also ensures that the sliding frame and the platform can still maintain reliable positioning under extreme working conditions, thereby improving the service life and safety factor of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the stand of the present invention; Figure 3 The structure of the platform of the present invention is shown in FIG. Figure 1 ; Figure 4 The structure of the platform of the present invention is shown in FIG. Figure 2 ; Figure 5 It is a schematic diagram of the structure of the protection component of the present invention; Figure 6 It is a structural schematic diagram of the auxiliary rail of the present invention; Figure 7 It is a structural schematic diagram of the sliding frame of the present invention; Figure 8 It is a schematic structural diagram of the connecting rod assembly of the present invention.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Stand; 11. longitudinal beam; 111. first fixed seat; 12. cross beam; 13. guide rail; 131. connecting angle piece; 2. Platform body; 21. stand; 22. auxiliary wheel; 221. wheel seat; 222. wheel body; 223. first connecting plate; 2231. first fixing hole; 23. Tabletop; 231. Diagonal brace; 3. Hydraulic cylinder; 31. Second fixed seat; 4. Protection components; 41. Auxiliary rail; 411. Positioning groove; 42, sliding frame; 421, weighing beam; 4211, positioning hole; 422, second connecting plate; 423, side beam; 4231, positioning groove; 4232, first pin seat; 4233, plug-in groove; 43. bow plate; 431. second fixing hole; 44. Positioning column; 441. Second pin connection seat; 45. connecting rod assembly; 451. driving rod; 4511. third pin connector; 452. driven rod; 453. positioning pin; 4531. cone head. DETAILED DESCRIPTION

[0021] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0022] Embodiment 1: See also Figure 1-8 A hydraulic lifting platform with a protective structure includes a stand 1, the stand 1 includes two oppositely arranged longitudinal beams 11, and cross beams 12 are arranged between the longitudinal beams 11 at equal intervals along the height direction thereof; a guide rail 13 is fixedly connected to the outer side of the longitudinal beam 11; a platform body 2 is slidably connected between the guide rails 13, and a hydraulic cylinder 3 is arranged at the bottom of the platform body 2, and the hydraulic cylinder 3 is used to control the lifting height of the platform body 2; a protective assembly 4 is arranged between the guide rails 13, and the protective assembly 4 includes an auxiliary rail 41 fixedly connected between the longitudinal beam 11 and the guide rail 13, the number of the auxiliary rails 41 is set to two, and the two auxiliary rails 41 are arranged oppositely, and a sliding frame 42 is slidably connected between the auxiliary rails 41, and the lower end surface of the sliding frame 42 is connected to a bow plate 43, and a positioning column 44 is inserted on the sliding frame 42, and the bottom end of the positioning column 44 is connected to the telescopic end of the hydraulic cylinder 3; a connecting rod assembly 45 is connected to the positioning column 44, and the connecting rod assembly 45 is used to lock the sliding frame 42 at any height of the auxiliary rail 41; the stand 1 is made of Q235B steel material and connected with the crossbeam 12 through automatic welding equipment. The width of the crossbeam 12 is set to 80 mm and the thickness is set to 5 mm. The connection between the frame 1 and the crossbeam 12 adopts a full welding process to improve the overall strength; the guide rail 13 is made of 45 steel and is quenched and tempered to improve the wear resistance. The guide rail 13 and the longitudinal beam 11 are fixed by high-strength bolts to ensure stable operation; the hydraulic cylinder 3 adopts a double-acting hydraulic cylinder of model HSG80×50-400 and adopts a high-pressure nitrile rubber seal. The rated working pressure of the hydraulic cylinder 3 is 16 MPa and can provide a maximum telescopic range of 400 mm; the protection component 4 realizes multi-level protection through the cooperation of the auxiliary rail 41 and the sliding frame 42, and uses the locking structure of the positioning column 44 and the connecting rod assembly 45 to prevent the platform 2 from falling suddenly when the hydraulic cylinder 3 fails; the connection method of the protection component 4 can relieve the bearing pressure of the hydraulic system and improve the safety of the lifting operation.

[0023] See also Figure 5-8The cross section of the auxiliary rail 41 is set to be T-shaped, and positioning grooves 411 are provided on the outer surface of the auxiliary rail 41 at equal intervals along its height direction; the sliding frame 42 includes a weighing beam 421, and both ends of the weighing beam 421 are fixedly connected to side beams 423, and the outer side of the side beam 423 is provided with a clamping groove 4231, which is engaged with the auxiliary rail 41; the auxiliary rail 41 is made of 40Cr steel and subjected to high-frequency quenching treatment to ensure that high wear resistance and strength are maintained during multiple lifting processes. The thickness of the auxiliary rail 41 is set to 10 mm and reinforcing ribs are added at the T-shaped structure to improve the bending resistance; the cross-sectional size of the weighing beam 421 is set to 120 mm m×50 mm and Q355B steel is selected to meet the large load requirements. The length of the weighing beam 421 is customized according to the working width of the platform body 2 and is connected to the side beam 423 through two-protection welding; the positioning groove 4231 of the side beam 423 and the auxiliary rail 41 adopt a clearance fit and lithium-based grease is coated on the interface to reduce friction. The internal length and width of the positioning groove 4231 are precisely matched according to the T-section of the auxiliary rail 41; the structure between the auxiliary rail 41 and the side beam 423 can ensure that the positioning column 44 and the bow plate 43 can slide smoothly when the hydraulic cylinder 3 pushes the sliding frame 42 to move up and down, and realize multi-point locking with the cooperation of the positioning groove 411.

[0024] See also Figure 5-8 The connecting rod assembly 45 includes a driving rod 451 rotatably connected to the bottom of the positioning column 44, and the other end of the driving rod 451 is rotatably connected to the inner side of the side beam 423; the lower end surface of the driving rod 451 is rotatably connected to a driven rod 452, and the other end of the driven rod 452 is rotatably connected to a positioning pin 453; one end of the positioning pin 453 passes through the side beam 423; the driving rod 451 is made of 45 steel round rod and the corrosion resistance is improved by chrome plating on the surface. The diameter of the driving rod 451 is set to 12 mm and needle bearings are set at both ends to ensure flexible rotation; the driven rod 452 is made of the same The movable rod 451 is made of the same material and is swingably connected to the driving rod 451 through a pin shaft. The length of the driven rod 452 is set to 25 mm and an oil cup is set at the connection to facilitate regular filling of lubricating oil; the positioning pin 453 is made of stainless steel 304 material and is nitrided on the surface to increase the hardness. A through hole with a diameter of 2 mm is provided at one end of the positioning pin 453 to facilitate the installation of a cotter pin to prevent loosening; the connecting rod assembly 45 cooperates with the positioning column 44 to synchronize with the side beam 423 when the hydraulic cylinder 3 is extended and retracted, so that the sliding frame 42 can be locked or unlocked according to operational requirements.

[0025] See also Figure 6-8, a plug-in slot 4233 is provided through the outer side of the lower end of the side beam 423, and the positioning pin 453 extends into the plug-in slot 4233; a cone head 4531 is provided at one end of the positioning pin 453, and the cone head 4531 is inserted into the positioning slot 411; the shape of the plug-in slot 4233 is set to be rectangular and chamfered on all sides to reduce wear, and a matching clearance of about 0.5 mm is maintained between the width of the plug-in slot 4233 and the diameter of the positioning pin 453; the cone head 4531 of the positioning pin 453 adopts a 60-degree cone angle design and is finely ground on the outer circumference to improve the fit with the positioning slot 411, and the surface hardness of the cone head 4531 can reach HRC58 or above to ensure that the positioning can be stably achieved after long-term use; through the cooperation between the plug-in slot 4233 of the side beam 423 and the positioning slot 411, the positioning pin 453 can automatically clamp the auxiliary rail 41 when the sliding frame 42 moves to the predetermined position, so that the positioning of the sliding frame 42 is quickly completed when the hydraulic cylinder 3 stops extending and retracting.

[0026] See also Figure 7-8 A positioning hole 4211 is provided at the top center of the weighing beam 421, and the positioning column 44 passes through the positioning hole 4211; a first pin seat 4232 is fixedly connected to the inner side of the side beam 423, and a second pin seat 441 is provided at the bottom end of the positioning column 44; the two ends of the driving rod 451 are respectively connected to the second pin seat 441 and the first pin seat 4232; a third pin seat 4511 is provided on the driving rod 451, and one end of the driven rod 452 is connected to the third pin seat 4511; the diameter of the positioning hole 4211 is increased by 1 mm according to the outer diameter of the positioning column 44 to ensure that the positioning column 44 passes smoothly, and the periphery of the positioning hole 4211 is made of an annular steel sleeve. The first pin joint 4232 and the second pin joint 441 are both made of 40Cr steel and quenched on the contact surface to improve wear resistance. The first pin joint 4232 and the second pin joint 441 are fixed to the side beam 423 or the positioning column 44 by high-strength bolts; the third pin joint 4511 and the driven rod 452 are connected by a detachable cylindrical pin to facilitate later maintenance and replacement. The thickness of the third pin joint 4511 is 8 mm and is formed by laser cutting; the weighing beam 421 guides the positioning column 44 through the positioning hole 4211, and the bow plate 43 and the sliding frame 42 are safely locked when the hydraulic cylinder 3 pushes the positioning column 44 to extend and retract.

[0027] See also Figure 1-4The platform body 2 includes a platform 21, and a platform plate 23 is fixedly connected to the outer side of the platform 21; a second connecting plate 422 is symmetrically fixedly connected to the side of the weighing beam 421, and the second connecting plate 422 is fixedly connected to the platform 21; the platform 21 is welded with rectangular steel pipes and ribs are added at key load-bearing positions to improve the overall rigidity. The specifications of the rectangular steel pipes are selected to be 60 mm × 40 mm × 3 mm; the platform plate 23 is made of patterned steel plate and is anti-slip treated on the surface. The thickness of the platform plate 23 is 4 mm and different thicknesses can be customized according to different load requirements; the second connecting plate 422 is connected to the weighing beam 421 by strengthening the weld and adopts a double-sided fillet welding process to improve the connection strength. The second connecting plate 422 is fixed to the platform 21 by M10 high-strength bolts and the surface of the bolts is galvanized for corrosion protection; the connection between the second connecting plate 422 and the platform 21 can make the platform body 2 move smoothly in the guide rail 13 and achieve accurate lifting and lowering under the telescopic action of the hydraulic cylinder 3.

[0028] See also Figure 1-4 , a diagonal brace 231 is symmetrically fixedly connected between the table plate 23 and the table frame 21; an auxiliary wheel 22 is symmetrically arranged on the back of the table frame 21, and the auxiliary wheel 22 includes a wheel seat 221, one side of the wheel seat 221 is symmetrically rotatably connected to the wheel body 222, and the other side is fixedly connected to a first connecting plate 223, and the side of the first connecting plate 223 is symmetrically fixedly connected to a first fixing hole 2231, and the first connecting plate 223 is fixedly connected to the table frame 21 by bolts; the diagonal brace 231 adopts a Q345B rectangular tube and is provided with welding flanges at both ends to connect with the table plate 23 and the table frame 21, and the size of the diagonal brace 231 is 40 mm × 20 mm × 2 mm and It can be further thickened when the operating load is large; the wheel seat 221 of the auxiliary wheel 22 is made of ductile iron HT250 material and anti-rust paint is sprayed on the surface. The diameter of the wheel body 222 is set to 50 mm and is rotatably connected to the wheel seat 221 through a rolling bearing to reduce friction; the thickness of the first connecting plate 223 is 6 mm and is formed through CNC cutting. The diameter of the first fixing hole 2231 is 10 mm to match the M10 bolt installation. The first connecting plate 223 and the platform 21 are locked by a combination of spring washers and flat washers to prevent loosening; when the auxiliary wheel 22 cooperates with the guide rail 13, it can provide auxiliary support during the movement of the platform 2 and maintain the smooth operation of the platform 2.

[0029] See also Figure 1-2, a first fixing seat 111 is fixedly connected to the bottom of the longitudinal beam 11; a connecting angle piece 131 is fixedly connected between the longitudinal beam 11 and the guide rail 13, and the auxiliary rail 41 is fixedly connected to the connecting angle piece 131; the first fixing seat 111 is made of C-shaped steel material and is anchored between the ground and the longitudinal beam 11 by chemical bolts. The height of the first fixing seat 111 can be adjusted according to the installation environment to ensure the verticality of the stand 1; the connecting angle piece 131 is made of L-shaped steel plate and is high-temperature tempered at the bend to reduce internal stress. The thickness of the connecting angle piece 131 is set to 8 mm and is fixed to the longitudinal beam 11 and the guide rail 13 through a full welding process. The connecting angle piece 131 and the auxiliary rail 41 are connected by countersunk bolts to ensure a firm installation and avoid sliding interference caused by the protrusion of the bolt head; the auxiliary rail 41 can maintain a stable state under the support of the connecting angle piece 131 and provide a reliable motion trajectory for the sliding frame 42 when the hydraulic cylinder 3 is extended and retracted.

[0030] See also Figure 5 and Figure 8 The shape of the bow plate 43 is set to be arched, and the two ends of the bow plate 43 are symmetrically penetrated with second fixing holes 431, and the bow plate 43 is fixed to the weighing beam 421 by screws; the bow plate 43 is made of 16Mn steel plate and is subjected to stress relief annealing after bending and forming. The curvature of the bow plate 43 is designed according to the lifting stroke of the platform 2 and straight sections are retained at both ends to facilitate docking with the weighing beam 421; the diameter of the second fixing hole 431 is 8 mm and is installed in conjunction with screws. The screws are 8.8 grade high-strength hexagon socket screws and are tightened by a torque wrench to ensure reliable connection; when the hydraulic cylinder 3 pushes the positioning column 44 to extend and retract, the bow plate 43 can be pressed by the positioning column 44 and transmit the force to the driving rod 451, and the driven rod 452 cooperates with the positioning groove 411 through the positioning pin 453 to complete the positioning of the sliding frame 42, and the bow structure can disperse stress and reduce local deformation during the force process.

[0031] Embodiment 2: 1. Structure and principle In this embodiment, the focus is on setting a T-shaped auxiliary rail between the longitudinal beam and the guide rail, and verifying the technical solution of locking with the positioning groove and the positioning pin. By arranging the positioning grooves at equal intervals on the outside of the auxiliary rail and realizing positive locking with the cone head of the positioning pin, when the hydraulic cylinder stops extending or fails, the linkage of the connecting rod assembly can automatically lock the sliding frame at the specified position of the auxiliary rail, thereby effectively preventing the platform from falling sharply.

[0032] The auxiliary rail material is 40Cr, and the heat treatment hardness reaches HRC50~55; the section height is 60mm, the width is 50mm, and the thickness of the T-shaped upper edge is 10mm.

[0033] The positioning pin is made of 304 stainless steel, with a cone head outer diameter of 10mm and a cone angle of 60°. The surface hardness can reach above HRC58 after nitriding treatment.

[0034] The hydraulic cylinder model is HSG80×50-400, with a maximum working pressure of 16MPa.

[0035] The frame and the guide rail are fixed with M12 high-strength bolts, and a C-shaped steel first fixing seat is set at the bottom of the frame to ensure the overall verticality.

[0036] 2. Comparative test conditions and control variables 1. Comparison object: Before improvement: No T-shaped auxiliary rails and positioning grooves were used, and only hydraulic cylinder self-locking and simple mechanical support rods were used for protection.

[0037] After improvement: A comprehensive protection solution of T-type auxiliary rail + positioning groove + positioning pin is adopted.

[0038] 2. Control variables: Same hydraulic cylinder specifications and operating pressures.

[0039] Same platform load (unified at 500kg).

[0040] Same frame size and welding process.

[0041] · Same operating speed (about 5 lifts per minute).

[0042] 3. Test items: · Sudden drop displacement: The distance the platform falls within 3 seconds when the hydraulic cylinder suddenly loses pressure.

[0043] Locking time: the time from when the hydraulic cylinder loses pressure to when the locating pin is completely locked into the locating groove.

[0044] Equipment vibration amplitude: The amount of vibration of the platform in the vertical direction when locked (measured by an accelerometer).

[0045] 3. Experimental Data and Analysis Under the same working conditions, 5 experiments were carried out and the results are shown in the following table:

[0046] It can be seen from the above table that the improvement scheme can significantly reduce the sudden fall displacement, shorten the locking time, and reduce the vibration amplitude of the equipment, which greatly improves the overall safety and stability.

[0047] Embodiment 3: 1. Structure and principle This embodiment is developed based on the working principle of the cooperation between the bow plate and the connecting rod assembly, and focuses on verifying the actual effect of reducing the workload of the hydraulic cylinder by dispersing the force of the bow plate and squeezing the drive rod to achieve multi-position locking when the hydraulic cylinder driving force is insufficient or fails.

[0048] The bow plate is made of 16Mn steel plate, with a bending radius of R = 120mm and a plate thickness of 4mm. A 20mm straight section is reserved at both ends of the arc section for installation.

[0049] The bottom end of the positioning column is connected to the piston rod of the hydraulic cylinder. The outer diameter of the positioning column is 40mm, and the material is 45# steel and has been quenched and tempered.

[0050] The cooperation of the driving rod, the driven rod and the positioning pin ensures that the bow plate can drive the positioning pin to disengage from the positioning groove laterally when the bow plate is subjected to upward force; after the hydraulic cylinder is depressurized, the bow plate will push the positioning pin to reinsert into the positioning groove during the elastic reset process.

[0051] 2. Comparative test conditions and control variables 1. Comparison object: Before improvement: No bow plate structure, directly connected to the hydraulic cylinder only through a rigid connecting rod.

[0052] After improvement: a bow plate is arranged at the lower end of the sliding frame, and cooperates with the positioning column and the connecting rod assembly to realize elastic reset.

[0053] 2. Control variables: Same specifications of hydraulic cylinders, dowel pins and auxiliary rails.

[0054] The platform load is uniformly 600 kg.

[0055] Same operating speed (approximately 4 lifts per minute).

[0056] 3. Test items: Average working pressure of hydraulic cylinder (MPa).

[0057] The sinking speed of the platform when the hydraulic cylinder fails (mm / s).

[0058] The maximum deformation of the bow plate (mm) is measured using a dial indicator.

[0059] 3. Experimental Data and Analysis The same 5 groups of experiments were carried out, and the results are as follows:

[0060] It can be seen that the use of the bow plate can reduce the average working pressure of the hydraulic cylinder by about 2 MPa under the same load. At the same time, when the hydraulic cylinder fails, the sinking speed is significantly slowed down, and the elastic deformation of the bow plate itself is relatively stable, indicating that it can effectively share the pressure of the hydraulic cylinder and provide temporary support to achieve safe locking.

[0061] 4. Related formulas If you need to calculate the stress of the bow under the action of external force, you can use the bending stress formula:

[0062] in: σ is the bending stress; · M is the bending moment; y is the distance from the centroid of the bow section to the edge of the load bearing edge; I is the moment of inertia of the area.

[0063] Embodiment 4: 1. Structure and principle This embodiment verifies the technical characteristics of setting auxiliary wheels on the back of the platform to roll with the guide rails to achieve smooth movement and reduce the working intensity of the hydraulic cylinder. The auxiliary wheels at the bottom of the platform are rolled with the wheel body through the wheel seat, thereby reducing friction and impact during lifting and lateral movement.

[0064] The auxiliary wheel adopts φ50 mm polyurethane rubber-coated wheel body and the wheel seat is HT250 ductile iron.

[0065] Rolling bearings (model 6204) are used between the wheel body and the wheel seat, which can withstand a radial load of about 800 N.

[0066] The guide rail is made of 45# steel, surface hardened to HRC55, and the guide accuracy during sliding is 0.2mm / m.

[0067] 2. Comparative test conditions and control variables 1. Comparison object: Before improvement: No auxiliary wheels or using ordinary nylon sliders to contact the guide rails.

[0068] After improvement: The polyurethane rubber-coated auxiliary wheel with bearing is used to make rolling contact with the guide rail.

[0069] 2. Control variables: Same platform load (700kg).

[0070] Same guide rail material and specifications.

[0071] Same hydraulic cylinder operating speed (about 5 times / minute).

[0072] 3. Test items: · Horizontal movement resistance (N).

[0073] · Platform shaking displacement during lifting (mm).

[0074] Energy consumption per lift (measured in motor input power, kW·h).

[0075] 3. Experimental Data and Analysis Five groups of comparative tests were conducted, and the data are as follows:

[0076] The results show that after using polyurethane-coated auxiliary wheels, the horizontal movement resistance is significantly reduced, the shaking displacement of the platform during the lifting process is reduced by more than 50%, and the energy consumption of a single lift is also reduced. It can be seen that the auxiliary wheel design helps to improve the system operation stability and reduce energy consumption.

[0077] 4. Related formulas If you want to calculate the moving resistance theoretically, you can refer to the approximate formula of rolling friction:

[0078] in: F is rolling resistance; Cr. is the rolling resistance coefficient, which is related to the wheel material and ground conditions; · G is the vertical load.

[0079] Embodiment 5: 1. Structure and principle This embodiment is based on the high-strength welding and anchoring between the vertical frame, the horizontal beam and the connecting angle pieces, combined with the technical solution of stable support of the first fixed seat, to verify its effect of controlling the vibration and tilt of the overall structure under multiple lifting and lateral force conditions.

[0080] · Both the frame and the crossbeam are made of Q235B steel, 5mm thick, and fully welded.

[0081] The thickness of the connecting angle piece is 8mm, it adopts L-shaped bending process and annealing treatment after bending to reduce internal stress.

[0082] · The first fixed seat is made of C-shaped steel (specifications: Anchored to the ground via 4 M16 chemical bolts.

[0083] 2. Comparative test conditions and control variables 1. Comparison object: Before improvement: The frame is simply fixed to the ground by expansion bolts, and the connecting corners are connected by ordinary welding or a small amount of spot welding.

[0084] After improvement: Adopt the combination of C-shaped steel first fixing seat + full welding + chemical bolts + L-shaped connecting angle pieces.

[0085] 2. Control variables: · Same foundation conditions and concrete strength (C30).

[0086] · Same load (unified at 800 kg).

[0087] Same operating frequency (about 100 lifts per day).

[0088] 3. Test items: · Horizontal displacement of the top of the stand (mm).

[0089] · Time (days) for the appearance of micro cracks, observed by nondestructive testing.

[0090] · Lateral force vibration peak acceleration

[0091] 3. Experimental Data and Analysis Five groups of typical test data are selected and listed in the following table:

[0092] It can be seen that after the improvement, the horizontal displacement of the top of the frame is significantly reduced, the time of appearance of micro cracks is significantly delayed, and the lateral vibration peak is also reduced by about 40%, which fully demonstrates that the high-strength welding, chemical bolt anchoring and connection angle strengthening can effectively extend the service life of the equipment and improve the operation stability.

[0093] 4. Related formulas If you need to calculate the bolt anchor strength, you can refer to the chemical bolt pull-out limit calculation formula:

[0094] in: · Fmax is the pull-out limit load; · A. is the cross-sectional area of ​​the bolt; fü is the ultimate strength of the bolt material.

[0095] The working principle of the present invention is: When in use, when the extension and contraction amount of the hydraulic cylinder 3 changes, the extension end of the hydraulic cylinder 3 will push the positioning column 44 to move upward, the positioning column 44 will squeeze the bow plate 43, and drive the driving rod 451 to rotate around the first pin seat 4232. The rotation of the driving rod 451 will pull the positioning pin 453 to move away from the auxiliary rail 41 through the driven rod 452, and separate the cone head 4531 from the positioning groove 411. This enables the sliding frame 42 to slide on the auxiliary rail 41; The movement of the sliding frame 42 will drive the platform 2 connected thereto to move synchronously. During the movement of the platform 2, the auxiliary wheels 22 located at the back of the frame 21 will roll on the guide rails 13. Through the cooperation of the auxiliary wheels 22 and the guide rails 13, the movement of the platform 2 can be made more stable. When the platform 2 reaches a predetermined transition, the hydraulic cylinder 3 stops exerting thrust on the positioning column 44. At this time, the positioning column 44 is pushed downward by the elastic force of the bow plate 43, and the positioning pin 453 is pushed into the insertion groove 4233 by the linkage of the driving rod 451 and the driven rod 452, and the cone head 4531 at one end of the positioning pin 453 is inserted into the positioning groove 411. Through the mutual engagement between the cone head 4531 and the positioning groove 411, the sliding frame 42 can be positioned between the two auxiliary rails 41, and the position of the platform 2 connected to the weighing beam 421 can be positioned; This not only reduces the working intensity of the hydraulic cylinder 3 , but also prevents the platform 2 from falling suddenly when the hydraulic cylinder 3 is damaged during use due to the action of the protective component 4 , thereby making the lifting process of the platform 2 safer.

[0096] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A hydraulic lifting platform with a protective structure, characterized in that: The vertical frame (1) comprises two longitudinal beams (11) arranged opposite to each other, and transverse beams (12) are arranged between the longitudinal beams (11) at equal intervals along the height direction thereof; A guide rail (13) is fixedly connected to the outer side of the longitudinal beam (11); A platform body (2) is slidably connected between the guide rails (13), and a hydraulic cylinder (3) is provided at the bottom of the platform body (2). The hydraulic cylinder (3) is used to control the lifting height of the platform body (2); A protection assembly (4) is arranged between the guide rails (13), the protection assembly (4) comprising an auxiliary rail (41) fixedly connected between the longitudinal beam (11) and the guide rail (13), the number of the auxiliary rails (41) being set to two, and the two auxiliary rails (41) being arranged opposite to each other, a sliding frame (42) being slidably connected between the auxiliary rails (41), a bow plate (43) being connected to the lower end surface of the sliding frame (42), and a positioning column (44) being inserted on the sliding frame (42), and the bottom end of the positioning column (44) being connected to the telescopic end of the hydraulic cylinder (3); A connecting rod assembly (45) is connected to the positioning column (44), and the connecting rod assembly (45) is used to lock the sliding frame (42) at any height of the auxiliary rail (41).

2. The hydraulic lifting platform with a protective structure according to claim 1, characterized in that: The cross section of the auxiliary rail (41) is set to be T-shaped, and positioning grooves (411) are provided on the outer surface of the auxiliary rail (41) at equal intervals along its height direction; The sliding frame (42) comprises a weighing beam (421), both ends of which are fixedly connected to side beams (423), and a clamping groove (4231) is provided on the outer side of the side beam (423), and the clamping groove (4231) is clamped onto the auxiliary rail (41).

3. The hydraulic lifting platform with a protective structure according to claim 2, characterized in that: The connecting rod assembly (45) comprises a driving rod (451) rotatably connected to the bottom of the positioning column (44), and the other end of the driving rod (451) is rotatably connected to the inner side of the side beam (423); The lower end surface of the driving rod (451) is rotatably connected to a driven rod (452), and the other end of the driven rod (452) is rotatably connected to a positioning pin (453); One end of the positioning pin (453) passes through the side beam (423).

4. The hydraulic lifting platform with a protective structure according to claim 3, characterized in that: A plug-in slot (4233) is formed through the outer side of the lower end of the side beam (423), and the positioning pin (453) extends into the plug-in slot (4233); A cone head (4531) is provided at one end of the positioning pin (453), and the cone head (4531) is inserted into the positioning groove (411).

5. The hydraulic lifting platform with a protective structure according to claim 3, characterized in that: A positioning hole (4211) is formed through the center of the top of the weighing beam (421), and the positioning column (44) passes through the positioning hole (4211); A first pin connection seat (4232) is fixedly connected to the inner side of the side beam (423), and a second pin connection seat (441) is provided at the bottom end of the positioning column (44); Two ends of the driving rod (451) are respectively connected to the second pin connection seat (441) and the first pin connection seat (4232); A third pin connection seat (4511) is provided on the driving rod (451), and one end of the driven rod (452) is connected to the third pin connection seat (4511).

6. The hydraulic lifting platform with a protective structure according to claim 2, characterized in that: The platform body (2) comprises a platform frame (21), and a platform plate (23) is fixedly connected to the outer side of the platform frame (21); A second connecting plate (422) is symmetrically fixedly connected to the side surface of the weighing crossbeam (421), and the second connecting plate (422) is fixedly connected to the platform (21).

7. The hydraulic lifting platform with a protective structure according to claim 6, characterized in that: A diagonal brace (231) is symmetrically fixedly connected between the table plate (23) and the stand (21); Auxiliary wheels (22) are symmetrically arranged on the back of the platform (21), and the auxiliary wheels (22) include a wheel seat (221), one side of the wheel seat (221) is symmetrically rotatably connected to the wheel body (222), and the other side is fixedly connected to a first connecting plate (223), the side of the first connecting plate (223) is symmetrically fixedly connected to a first fixing hole (2231), and the first connecting plate (223) is fixedly connected to the platform (21) by bolts.

8. The hydraulic lifting platform with a protective structure according to claim 2, characterized in that: The bottom of the longitudinal beam (11) is fixedly connected to a first fixing seat (111); A connecting angle piece (131) is fixedly connected between the longitudinal beam (11) and the guide rail (13), and the auxiliary rail (41) is fixedly connected to the connecting angle piece (131).

9. The hydraulic lifting platform with a protective structure according to claim 3, characterized in that: The shape of the bow plate (43) is set to be an arch shape, and second fixing holes (431) are symmetrically opened at both ends of the bow plate (43), and the bow plate (43) is fixed to the weighing beam (421) by screws.

10. The hydraulic lifting platform with a protective structure according to claim 1, characterized in that: A second fixing seat (31) is provided at the bottom of the hydraulic cylinder (3).

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