Anti-falling type hydraulic lifting machine

Abstract

The utility model discloses an anti-falling type hydraulic lifting machine which comprises two stand columns which are symmetrically arranged, lifting frames are connected to the two stand columns in a sliding mode, the lifting frames and the stand columns are connected through hydraulic cylinders, the two lifting frames are connected through a fixing and locking mechanism, the outer ends of the lifting frames are connected with supporting blocks used for lifting objects, and the supporting blocks are connected with the stand columns in a sliding mode. The upper ends of the supporting blocks extend to the position above the lifting frame and form a lifting face, the middles of the supporting blocks are in threaded connection with limiting nuts located on the upper side and the lower side of the lifting frame, the bottoms of part of the supporting blocks are detachably connected with a mounting frame, the mounting frame and the lifting frame are connected through limiting pieces, and a detection assembly is connected into the mounting frame. The detection assembly comprises an infrared transmitter and an infrared receiver which are matched with each other, and the infrared transmitter and the infrared receiver are installed on the installation frames of the lifting frames on the two sides respectively. The utility model has the characteristics of high safety and good locking effect.

Description

Technical Field

[0001] This utility model relates to a lifting machine, and more particularly to a fall-proof hydraulic lifting machine. Background Technology

[0002] Current dual-post lifts, as shown in patent 202210903568.9, include two symmetrically arranged columns, each connected to a lifting frame. The lifting frames and columns are interconnected by hydraulic cylinders, which drive the lifting frames to rise and fall. The outer ends of the lifting frames extend outwards to support items. However, this structure has a drawback: because each lifting frame is driven by two independent hydraulic cylinders, a difference in the extension and retraction speeds of the two cylinders can cause the lifting frames to be at different heights, leading to items tilting and potentially falling, resulting in low safety.

[0003] Secondly, to ensure the stability of the two-post lift, a locking mechanism is installed. This mechanism limits the lifting frame after it is positioned at a certain height, preventing displacement in case of hydraulic cylinder malfunction or misoperation. However, this locking mechanism has two drawbacks. First, because the locking plate needs to rotate to disengage from the locking teeth in the unlocked state, space must be left in the locking groove for the locking plate to rotate and disengage. This requires the lifting frame to be lifted to a greater height to return to the locked state, thus reducing the locking effect. Second, when the lifting frame is raised to a non-locked position, the locking plate is in a tilted state due to the obstruction of the locking teeth, which interferes with the locking action of the limiting plate. In other words, the limiting plate cannot return to the retracted state and achieve the locking function in this state. Furthermore, because the locking mechanism is hidden inside the lift's columns and cannot be directly observed, operators cannot directly determine whether the lifting frame is in the locked position. Instead, they need to repeatedly raise and lower the lifting frame and test it to reach the locked position, increasing the difficulty of operation.

[0004] Therefore, existing two-post lifts suffer from low safety and poor locking performance. Utility Model Content

[0005] The purpose of this invention is to provide a fall-proof hydraulic lift. It features high safety and a good locking effect.

[0006] The technical solution of this utility model is as follows: A fall-proof hydraulic lift includes two symmetrically arranged columns, each with a slidably connected lifting frame. The lifting frames and columns are connected to each other via hydraulic cylinders, and the two lifting frames are connected to each other via a locking mechanism. A support block for lifting items is connected to the outer end of each lifting frame. The upper end of the support block extends above the lifting frame and forms a lifting surface. Limiting nuts located on the upper and lower sides of the lifting frame are threadedly connected to the middle of the support block. A mounting frame is detachably connected to the bottom of some of the support blocks. The mounting frame and the lifting frame are connected to each other via limiting components. A detection component is connected inside the mounting frame. The detection component includes a cooperating infrared transmitter and infrared receiver, which are respectively mounted on the mounting frames of the two lifting frames. The infrared transmitter emits infrared signals to the infrared receiver, and the infrared receiver controls the lifting frame to stop operating after failing to receive an infrared signal.

[0007] In the aforementioned anti-fall hydraulic lift, the bottom of the support block is threaded with a pressure cap, and an installation groove is formed between the support block and the pressure cap. The mounting bracket is fastened and connected in the installation groove, and the lower end of the mounting bracket extends below the pressure cap and is connected to the detection component.

[0008] In the aforementioned anti-fall hydraulic lift, the mounting frame includes a split first mounting plate and a second mounting plate. The first mounting plate has a mounting groove fastened to its center, and mounting holes are provided on both sides of the first mounting plate. The two ends of the second mounting plate are bent and fit together with the first mounting plate. The limiting member is a limiting screw. One end of the limiting screw is fastened to the bent part via a U-shaped groove, and the other end of the limiting screw passes through the bent part and the first mounting plate and is threaded to the lifting frame.

[0009] In the aforementioned anti-fall hydraulic lift, the mounting bracket is threaded to the lower end of the support block, and the two sides of the mounting bracket extend to the outside of the support block and are provided with mounting holes; the limiting member is a limiting screw, the upper end of the limiting screw passes through the mounting hole and is threaded to the lifting frame.

[0010] In the aforementioned anti-fall hydraulic lift, the locking mechanism includes locking teeth symmetrically arranged on two columns. Several locking grooves are distributed at intervals along the height direction on the locking teeth. A locking plate is engaged and connected in any locking groove. A lifting frame is slidably connected to the middle of the locking plate. A limiting plate that is rotatably connected to the lifting frame is provided on the side of the locking plate away from the locking teeth. A drive mechanism and a reset mechanism are respectively connected to the outside of the limiting plate. A telescopic component and a support plate are respectively provided in the middle of the limiting plate. The telescopic component includes a pull rod that is rotatably connected to the limiting plate. The end of the pull rod extends to the outside of the limiting plate and is rotatably connected to the locking plate.

[0011] In the aforementioned anti-fall hydraulic lift, a T-shaped slide rod is slidably connected to the middle of the locking plate. One side of the slide rod is rotatably connected to a pull rod, and the other side of the slide rod is connected to the locking plate via an elastic element. The elastic element is used to apply a compressive force to the locking plate toward the pull rod side.

[0012] In the aforementioned anti-fall hydraulic lift, the locking plate includes two first plates arranged side by side, which are connected to each other via a second plate. One side of the slide rod is slidably connected to the second plate. The elastic element is a compression spring sleeved on the outside of the slide rod, with both ends of the compression spring respectively in contact with the slide rod and the second plate.

[0013] The aforementioned anti-fall hydraulic lift also includes a guide component that is fixedly connected to the lifting frame. There are two guide components, which are located on the upper and lower sides of the locking plate respectively. Several rubber rollers are arranged side by side on the guide components, and the ends of the rubber rollers are in contact with the top or bottom of the first plate.

[0014] In the aforementioned anti-fall hydraulic lift, the second plate is provided with a limit switch on the side near the lock groove, and the limit switch is externally connected to the lifting frame.

[0015] In the aforementioned anti-fall hydraulic lift, the reset mechanism is a tension spring, with the two ends of the tension spring connected to a limiting plate and a lifting frame, respectively.

[0016] In the aforementioned anti-fall hydraulic lift, the drive mechanism includes a first drive wheel rotatably connected to a limit plate, and second drive wheels on the upper and lower sides of the first drive wheel. The first drive wheel and the second drive wheel are offset to each other. Steel wire ropes are connected to the first drive wheel and the second drive wheel. One end of the steel wire rope is fixedly connected to the top of a column on one side, and the other end of the steel wire rope passes through two lifting frames in sequence and is connected to a drive component located on the column on the other side.

[0017] Compared with the prior art, this utility model has the following characteristics:

[0018] (1) This utility model uses infrared transmitters and infrared receivers respectively installed on two lifting frames to enable synchronous detection of the lifting frames during lifting. That is, when the lifting frame is at a height deviation, the infrared transmitter and infrared receiver are misaligned, and the infrared receiver controls the lifting frame to stop, thereby preventing the falling hazards caused by the height deviation of the two lifting frames and ensuring the safety of this utility model. On this basis, by connecting the detection component to the bottom of the support block through the mounting bracket, the height of the detection component can also be adjusted with the height of the support block. That is, when the two lifting frames are deformed and drooping to different degrees after long-term use, the operator can adjust the height of the support block to keep the two supporting surfaces at the same height and make the detection component at the same height, thereby further improving the safety of this utility model and the detection stability of the detection component.

[0019] (2) By limiting the connection structure between the mounting frame, the support block and the lifting frame, the mounting frame can adjust its height position with the support block on the one hand, and can also use the lifting frame to rigidly limit its rotation angle on the other hand, so that the infrared transmitter and the infrared receiver can maintain relative settings after positioning and will not shift with the rotation of the support block, thereby further improving the detection stability of the detection component.

[0020] (3) By limiting the structure of the locking mechanism, on the one hand, the limiting plate can be driven to move laterally by the telescopic component during rotation, thus eliminating the need to leave space for the locking plate to open compared to existing locking mechanisms, thereby improving the locking effect of this utility model; on the other hand, when the limiting plate is rotated to the locked state, the telescopic component can also apply a squeezing force towards the lock groove to the sliding rod; at this time, if the lock plate is in the locked position, the sliding rod will be driven by the elastic element to slide the limiting plate to engage with the lock groove after being subjected to force, thereby realizing the locking function; while if the lock plate is in the locked position, the sliding rod will be driven by the elastic component to slide the limiting plate to engage with the lock groove, thereby realizing the locking function; and if the lock plate is in the locked position, the sliding rod will be driven to move laterally by the elastic component to open .... In the non-locking position, the locking plate is in contact with the inner wall of the toothed plate. At the same time, the slide rod is in a retracted state after being subjected to compressive force, and applies inward compressive force to the locking plate. That is, the locking plate can continue to rise and fall to the locking position in this state. After moving to the locking position, it is quickly pressed into the locking groove by the elastic element to form a lock. With the above cooperation, this utility model can activate the locking function when the lifting frame is at any height position, and form a lock when the lifting frame moves to the locking position, thus effectively improving the locking effect of this utility model.

[0021] Therefore, this utility model has the characteristics of high security and good locking effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2This is a schematic diagram showing the connection between the support block and the detection component in Embodiment 1;

[0024] Figure 3 This is a schematic diagram of the locking mechanism in the locked state in Embodiment 1;

[0025] Figure 4 This is a schematic diagram showing the connection between the support block and the detection component in Embodiment 2;

[0026] Figure 5 This is a schematic diagram of the locking mechanism in the locked state in Embodiment 2;

[0027] Figure 6 This is a schematic diagram of the locking mechanism in the non-locking state in Embodiment 2;

[0028] Figure 7 This is a diagram showing the locking state of the locking mechanism in the non-locking position in Example 2.

[0029] The labels in the attached diagram are as follows: 1-Column, 2-Lifting frame, 3-Support block, 4-Lifting surface, 5-Limit nut, 6-Mounting frame, 7-Limiting component, 8-Infrared transmitter, 9-Infrared receiver, 10-Cover, 11-Locking tooth, 12-Locking groove, 13-Locking plate, 14-Limiting plate, 15-Support plate, 16-Pull rod, 17-Slide rod, 18-Elastic component, 19-Guide component, 20-Limit switch, 21-Tension spring, 22-First drive wheel, 23-Second drive wheel, 24-Wire rope, 25-Drive component, 601-First mounting plate, 602-Second mounting plate, 131-First plate, 132-Second plate. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0031] Example 1. A fall-proof hydraulic lift, configured as follows: Figure 1-3As shown, the device includes two symmetrically arranged columns 1, each with a slidably connected lifting frame 2. The lifting frame 2 and the columns 1 are connected to each other via hydraulic cylinders, and the two lifting frames 2 are connected to each other via a locking mechanism. The outer end of the lifting frame 2 is connected to a support block 3 for lifting items. The upper end of the support block 3 extends above the lifting frame 2 and forms a lifting surface 4. The middle of the support block 3 is threaded with limiting nuts 5 located on the upper and lower sides of the lifting frame 2. The limiting nuts 5 are in contact with the lifting frame 2 and are used to squeeze and limit the support block 3. The bottom of part of the support block 3 is detachably connected to a mounting frame 6. The mounting frame 6 and the lifting frame 2 are connected to each other via limiting parts 7. The mounting frame 6 is connected to a detection component. The detection component includes an infrared transmitter 8 and an infrared receiver 9 arranged opposite to each other and cooperating with each other. The infrared transmitter 8 and the infrared receiver 9 are respectively mounted on the mounting frame 6 of the two lifting frames 2. The infrared transmitter 8 is used to emit infrared signals to the infrared receiver 9. The infrared receiver 9 is used to control the lifting frame 2 to stop moving after not receiving infrared signals.

[0032] The bottom of the support block 3 is threadedly connected to the pressure cover 10, and an installation groove is formed between the support block 3 and the pressure cover 10. The mounting bracket 6 is fastened and connected in the installation groove, and the lower end of the mounting bracket 6 extends to the bottom of the pressure cover 10 and is connected to the detection component.

[0033] The mounting bracket 6 includes a split first mounting piece 601 and a second mounting piece 602. The middle part of the first mounting piece 601 is fastened to the mounting groove, and the two sides of the first mounting piece 601 are provided with mounting holes. The two ends of the second mounting piece 602 are bent and fit together with the first mounting piece 601. The limiting member 7 is a limiting screw. One end of the limiting screw is fastened to the bent part through a U-shaped groove, and the other end of the limiting screw passes through the bent part and the first mounting piece 601 and is threaded to the lifting frame 2.

[0034] Different thicknesses of shims can be installed between the first mounting plate 601 and the bent part as needed, so that the height of the second mounting plate 602 can be adjusted by using the shims, so that the infrared transmitters 8 and infrared receivers 9 on both sides can still be at the same height after the height of the support block 3 is adjusted.

[0035] The locking mechanism includes locking teeth 11 symmetrically arranged on two columns 1, which are fixedly connected to the side walls of the columns 1. Several locking grooves 12 are distributed at intervals along the height direction on the locking teeth 11. A locking plate 13 is engaged and connected in any locking groove 12. The middle part of the locking plate 13 is slidably connected to the lifting frame 2. A limiting plate 14 that is rotatably connected to the lifting frame 2 is provided on the side of the locking plate 13 away from the locking teeth 11. A driving mechanism and a reset mechanism are respectively connected to the outside of the limiting plate 14. A telescopic component and a support plate 15 are respectively provided in the middle part of the limiting plate 14. The telescopic component includes a pull rod 16 that is rotatably connected to the limiting plate 14. The end of the pull rod 16 extends to the outside of the limiting plate 14 and is rotatably connected to the locking plate 13.

[0036] It also includes a guide member 19 that is fixedly connected to the lifting frame 2. There are two guide members 19, which are located on the upper and lower sides of the locking plate 13 respectively. Several rubber rollers are arranged side by side on the guide member 19, and the ends of the rubber rollers are in contact with the top or bottom of the first plate 131.

[0037] The second plate 132 is provided with a limit switch 20 on the side near the lock groove 12. The limit switch 20 is externally connected to the lifting frame 2. When the lock plate 13 and the lock groove 12 are in a mutually engaging state, the limit switch 20 is triggered by the pressure of the second plate 132, thereby realizing the fixed lock display function.

[0038] The reset mechanism is a tension spring 21, with the two ends of the tension spring 21 connected to the limiting plate 14 and the lifting frame 2, respectively.

[0039] The driving mechanism includes a first drive wheel 22 rotatably connected to a limiting plate 14. Two second drive wheels 23 are respectively connected to the lifting frame 2 and the limiting plate 14 on the upper and lower sides of the first drive wheel 22. The first drive wheel 22 and the second drive wheels 23 are staggered left and right. Steel wire ropes 24 are connected to the first drive wheel 22 and the second drive wheels 23. One end of the steel wire rope 24 is fixedly connected to the top of one side column 1, and the other end of the steel wire rope 24 passes through the two lifting frames 2 in sequence and is connected to a driving component 25 located on the other side column 1. This driving component 25 can be an operating handle or an electric telescopic rod. Guide wheels for reversing the steel wire rope 24 can be provided at the bottom and top of the column as needed, so that the steel wire rope 24 passes through the bottom of one side column 1 and extends into the other side column 1.

[0040] In this embodiment, the infrared transmitter 8 and infrared receiver 9 work together to ensure that during the lifting of the two lifting frames 2, the infrared transmitter 8 emits infrared light to the infrared receiver 9, which then detects this light. When the infrared receiver 9 receives the infrared light, it indicates that the two lifting frames 2 are in a synchronized lifting state. When the infrared receiver 9 fails to receive the infrared light, it indicates that the two lifting frames 2 are in a height misalignment state, and the infrared receiver 9 controls the lift to stop and enter a fault state, requiring manual correction and fault resolution by the operator. When the lifting frame 2 sags and deforms after long-term use, the operator can adjust the height of the support block 3 using the limit nut 5, ensuring that the two supporting surfaces 4 remain at the same height after the lifting frame 2 deforms. Simultaneously, the mounting bracket 6 allows the height of the detection components to rise and fall with the support block 3, ensuring that the two detection components are aligned after the lifting frame 2 deforms, thus improving the detection effect.

[0041] By structurally defining the locking mechanism, when the lift switches to the locked state, the drive unit 25 controls the wire rope 24 to retract, causing the limiting plate 14 to rotate inward under the pull of the tension spring 21. During the rotation of the limiting plate 14, the pull rod 16 applies inward pressure to the locking plate 13, causing the locking plate 13 to move laterally under the pressure until it engages with the locking groove 12. Simultaneously, after the limiting plate 14 has rotated to its final position, the support plate 15 lifts the bottom of the locking plate 13, thus achieving the locking function and preventing abnormal lifting of the lifting frame in this state.

[0042] Example 2. A fall-proof hydraulic lift, configured as follows: Figure 1 and 4 As shown in Figure 7, the device includes two symmetrically arranged columns 1, each with a slidably connected lifting frame 2. The lifting frame 2 and the columns 1 are connected to each other via hydraulic cylinders, and the two lifting frames 2 are connected to each other via a locking mechanism. The outer end of the lifting frame 2 is connected to a support block 3 for lifting items. The upper end of the support block 3 extends above the lifting frame 2 and forms a lifting surface 4. The middle of the support block 3 is threaded with limiting nuts 5 located on the upper and lower sides of the lifting frame 2. The limiting nuts 5 are in contact with the lifting frame 2 and are used to squeeze and limit the support block 3. The bottom of part of the support block 3 is detachably connected to a mounting frame 6. The mounting frame 6 and the lifting frame 2 are connected to each other via limiting parts 7. The mounting frame 6 is connected to a detection component. The detection component includes an infrared transmitter 8 and an infrared receiver 9 arranged opposite to each other and cooperating with each other. The infrared transmitter 8 and the infrared receiver 9 are respectively mounted on the mounting frame 6 of the two lifting frames 2. The infrared transmitter 8 is used to emit infrared signals to the infrared receiver 9. The infrared receiver 9 is used to control the lifting frame 2 to stop moving after not receiving infrared signals.

[0043] The mounting bracket 6 is threaded to the lower end of the support block 3, and the two sides of the mounting bracket 6 extend to the outside of the support block 3 and are provided with mounting holes; the limiting member 7 is a limiting screw, the upper end of the limiting screw passes through the mounting hole and is threaded to the lifting frame 2.

[0044] The locking mechanism includes locking teeth 11 symmetrically arranged on two columns 1, which are fixedly connected to the side walls of the columns 1. Several locking grooves 12 are distributed at intervals along the height direction on the locking teeth 11. A locking plate 13 is engaged and connected in any locking groove 12. The middle part of the locking plate 13 is slidably connected to the lifting frame 2. A limiting plate 14 that is rotatably connected to the lifting frame 2 is provided on the side of the locking plate 13 away from the locking teeth 11. A driving mechanism and a reset mechanism are respectively connected to the outside of the limiting plate 14. A telescopic component and a support plate 15 are respectively provided in the middle part of the limiting plate 14. The telescopic component includes a pull rod 16 that is rotatably connected to the limiting plate 14. The end of the pull rod 16 extends to the outside of the limiting plate 14 and is rotatably connected to the locking plate 13.

[0045] The locking plate 13 is slidably connected to a T-shaped slide rod 17 in the middle. One side of the slide rod 17 is rotatably connected to a pull rod 16, and the other side of the slide rod 17 is connected to the locking plate 13 via an elastic member 18. The elastic member 18 is used to apply a compressive force to the locking plate 13 toward the pull rod 16.

[0046] The locking plate 13 includes two first plates 131 arranged side by side, which are connected to each other via a second plate 132. The first plates 131 and the second plates 132 are arranged perpendicular to each other. One side of the slide rod 17 is slidably connected to the second plate 132. The elastic element 18 is a compression spring sleeved on the outside of the slide rod 17. The slide rod 17 is provided with a pressure plate for applying unidirectional pressure to the second plate 132. The pressure plate is separated from the second plate 132 in the locked state. The two ends of the compression spring are respectively attached to the slide rod 17 and the second plate 132.

[0047] It also includes a guide member 19 that is fixedly connected to the lifting frame 2. There are two guide members 19, which are located on the upper and lower sides of the locking plate 13 respectively. Several rubber rollers are arranged side by side on the guide member 19, and the ends of the rubber rollers are in contact with the top or bottom of the first plate 131.

[0048] The second plate 132 is provided with a limit switch 20 on the side near the lock groove 12. The limit switch 20 is externally connected to the lifting frame 2. When the lock plate 13 and the lock groove 12 are in a mutually engaging state, the limit switch 20 is triggered by the pressure of the second plate 132, thereby realizing the fixed lock display function.

[0049] The reset mechanism is a tension spring 21, with the two ends of the tension spring 21 connected to the limiting plate 14 and the lifting frame 2, respectively.

[0050] The driving mechanism includes a first drive wheel 22 rotatably connected to a limiting plate 14. Two second drive wheels 23 are respectively connected to the lifting frame 2 and the limiting plate 14 on the upper and lower sides of the first drive wheel 22. The first drive wheel 22 and the second drive wheels 23 are staggered left and right. Steel wire ropes 24 are connected to the first drive wheel 22 and the second drive wheels 23. One end of the steel wire rope 24 is fixedly connected to the top of one side column 1, and the other end of the steel wire rope 24 passes through the two lifting frames 2 in sequence and is connected to a driving component 25 located on the other side column 1. This driving component 25 can be an operating handle or an electric telescopic rod. Guide wheels for reversing the steel wire rope 24 can be provided at the bottom and top of the column as needed, so that the steel wire rope 24 passes through the bottom of one side column 1 and extends into the other side column 1.

[0051] Compared with Embodiment 1, this embodiment further adjusts the connection structure between the locking plate 13 and the limiting plate 14, so that when the lifting frame switches to the fixed locking state, the driving component 25 controls the wire rope 24 to retract, causing the limiting plate 14 to rotate inward under the traction of the tension spring 21. During the rotation of the limiting plate 14, the pull rod 16 applies inward pressure to the slide rod 17, so that the slide rod 17 applies pressure to the locking plate 13 through the elastic element 18 under the action of the extrusion force. At this time, if the locking plate 13 is in the fixed locking position, the locking plate 13 moves to engage with the locking groove 12 after being pressed. If the locking plate 13 is in the non-fixed locking position, the locking plate 13 moves to fit against the side wall of the locking tooth 11 after being pressed. At the same time, the elastic element 18 is compressed and retracts, so that when the lifting frame 2 moves to the fixed locking position, the elastic element 18 drives the locking plate 13 to engage with the locking groove 12, realizing the fixed locking function.

[0052] With the above coordination, the lateral movement of the locking plate 13 can be changed from the rigid drive of the pull rod 16 to the elastic drive of the elastic element 18. This allows the operator to still open the locking state when the locking plate 13 and the locking groove 12 are misaligned. The locking plate 13 can then perform the locking function after the lifting frame 2 moves into place, which effectively improves the locking effect of the lifting frame 2.

Claims

1. A fall-prevention hydraulic lift, comprising two symmetrically arranged columns (1), each column (1) having a lifting frame (2) slidably connected to it, the lifting frames (2) and the columns (1) being interconnected by hydraulic cylinders, the two lifting frames (2) being interconnected by a locking mechanism, and the outer end of each lifting frame (2) being connected to a support block (3) for lifting items, characterized in that: The upper end of the support block (3) extends above the lifting frame (2) and forms a lifting surface (4). The middle part of the support block (3) is threaded with limiting nuts (5) located on the upper and lower sides of the lifting frame (2). The bottom of part of the support block (3) is detachably connected to a mounting frame (6). The mounting frame (6) and the lifting frame (2) are connected to each other by limiting parts (7). The mounting frame (6) is connected to a detection component. The detection component includes an infrared transmitter (8) and an infrared receiver (9) that cooperate with each other. The infrared transmitter (8) and the infrared receiver (9) are respectively installed on the mounting frame (6) of the lifting frames (2) on both sides. The infrared transmitter (8) is used to transmit infrared signals to the infrared receiver (9). The infrared receiver (9) is used to control the lifting frame (2) to stop moving after it does not receive infrared signals.

2. The anti-fall hydraulic lift according to claim 1, characterized in that: The bottom of the support block (3) is threaded with a pressure cap (10), and an installation groove is formed between the support block (3) and the pressure cap (10). The mounting bracket (6) is fastened and connected in the installation groove, and the lower end of the mounting bracket (6) extends to the bottom of the pressure cap (10) and is connected to the detection component.

3. The anti-fall hydraulic lift according to claim 2, characterized in that: The mounting bracket (6) includes a split first mounting piece (601) and a second mounting piece (602). The middle part of the first mounting piece (601) is fastened to the mounting groove. Mounting holes are provided on both sides of the first mounting piece (601). The two ends of the second mounting piece (602) are bent and fit together with the first mounting piece (601). The limiting member (7) is a limiting screw. One end of the limiting screw is fastened to the bent part through a U-shaped groove. The other end of the limiting screw passes through the bent part and the first mounting piece (601) and is threaded to the lifting frame (2).

4. The anti-fall hydraulic lift according to claim 1, characterized in that: The mounting bracket (6) is threaded to the lower end of the support block (3), and the two sides of the mounting bracket (6) extend to the outside of the support block (3) and are provided with mounting holes; the limiting member (7) is a limiting screw, the upper end of the limiting screw passes through the mounting hole and is threaded to the lifting frame (2).

5. The anti-fall hydraulic lift according to claim 1, characterized in that: The locking mechanism includes locking teeth (11) symmetrically arranged on two columns (1). Several locking grooves (12) are distributed at intervals along the height direction on the locking teeth (11). A locking plate (13) is fastened and connected in any locking groove (12). The middle part of the locking plate (13) is slidably connected to the lifting frame (2). The locking plate (13) is provided with a limiting plate (14) rotatably connected to the lifting frame (2) on the side away from the locking teeth (11). The outside of the limiting plate (14) is connected to a driving mechanism and a reset mechanism respectively. The middle part of the limiting plate (14) is provided with a telescopic component and a support plate (15) respectively. The telescopic component includes a pull rod (16) rotatably connected to the limiting plate (14). The end of the pull rod (16) extends to the outside of the limiting plate (14) and rotatably connected to the locking plate (13).

6. The anti-fall hydraulic lift according to claim 5, characterized in that: The locking plate (13) is slidably connected to a T-shaped slide rod (17) in the middle. One side of the slide rod (17) is rotatably connected to a pull rod (16), and the other side of the slide rod (17) is connected to the locking plate (13) via an elastic element (18). The elastic element (18) is used to apply a squeezing force to the locking plate (13) towards the pull rod (16).

7. A fall-resistant hydraulic lift according to claim 6, characterized in that: The locking plate (13) includes two first plates (131) arranged side by side, which are connected to each other via a second plate (132). One side of the slide rod (17) is slidably connected to the second plate (132). The elastic element (18) is a compression spring sleeved on the outside of the slide rod (17), with both ends of the compression spring respectively in contact with the slide rod (17) and the second plate (132).

8. A fall-resistant hydraulic lift according to claim 5, characterized in that: The reset mechanism is a tension spring (21), and the two ends of the tension spring (21) are respectively connected to the limiting plate (14) and the lifting frame (2).

9. A fall-resistant hydraulic lift according to claim 5, characterized in that: The driving mechanism includes a first driving wheel (22) rotatably connected to a limiting plate (14), and second driving wheels (23) provided on the upper and lower sides of the first driving wheel (22). The first driving wheel (22) and the second driving wheel (23) are staggered left and right. A steel wire rope (24) is connected to the first driving wheel (22) and the second driving wheel (23). One end of the steel wire rope (24) is fixedly connected to the top of a column (1) on one side, and the other end of the steel wire rope (24) passes through two lifting frames (2) in sequence and is connected to a driving component (25) located on the other column (1).

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