Scissor hydraulic lifting platform for condenser tube insertion

Abstract

A scissor hydraulic lifting platform for condenser tube insertion, comprising a base (501), a scissor mechanism (301), hydraulic cylinders (10), a lifting platform (402) and a self-locking mechanism (101); the self-locking mechanism (101) is fixed on two sides of the bottom surface of the base (501); one side of the lower end of the scissor mechanism (301) is hinged and fixed to the base (501), and the other side thereof is hinged to the self-locking mechanism (101); the upper end of the scissor mechanism (301) is movably connected to the lifting platform (402); the two sides of the base (501) are parallel; two hydraulic cylinders (10) are fixed in the middle of the scissor mechanism (301), and each hydraulic cylinder (10) is provided with a position-limiting device for stopping further oil feeding when rising to a limit distance, thus avoiding the risk of disengagement; in addition, the self-locking mechanism (101) can lock the scissor mechanism (301) during the falling process of the lifting platform (402), and can achieve platform stability during normal use.

Description

Scissor-type condenser pipe threading hydraulic lifting platform Technical Field

[0001] The invention relates to the technical field of hydraulic lifting mechanical equipment, in particular to a scissor-type condenser pipe-threading hydraulic lifting platform. Background Art

[0002] A scissor-type hydraulic lift platform is a common type of lifting equipment that uses hydraulic technology to achieve lifting operations. The scissor-type hydraulic lift platform uses a hydraulic system to provide power and control lifting operations. The hydraulic system mainly includes components such as hydraulic pumps, hydraulic cylinders, and hydraulic valves. The hydraulic pump provides pressure to send hydraulic oil into the hydraulic cylinder, and the hydraulic cylinder achieves lifting motion through the action of hydraulic oil. The structural design of the scissor-type hydraulic lift platform is very important. It needs to take into account factors such as load-bearing capacity, stability, and reliability. Structural design involves technologies such as material selection, connection methods, and support methods to ensure that the platform can work safely and stably during lifting movements.

[0003] Ordinary scissor-type hydraulic lifting platforms do not have sufficient protection measures, especially in places where large tanks such as condensers and heat exchangers are used. During the ascent, the hydraulic cylinder may continue to fill with oil before reaching the expected height, causing the hydraulic rod to disengage, making the entire scissor mechanism unsupported and causing it to fall, creating a danger. There are indeed limit protection measures, but during the descent process and use, there is no self-locking mechanism to prevent damage to the hydraulic cylinder and descent due to its own weight, which can easily lead to safety accidents. Technical issues

[0004] (1) Technical problems solved: In response to the shortcomings of the existing technology, the present invention provides a scissor-type condenser pipe-penetrating hydraulic lifting platform, which has the advantages of hydraulic cylinder limitation and self-locking, and solves the problem of safety hazards during the use of the lifting platform. Technical Solutions

[0005] (2) Technical solution: In order to achieve the above-mentioned hydraulic cylinder limitation and the purpose of self-locking, the present invention provides the following technical solution: a scissor-type condenser pipe-threading hydraulic lifting platform, including a base, a scissor mechanism, a hydraulic cylinder and a lifting platform, and also includes a self-locking mechanism. The lifting platform is horizontally arranged on the upper part of the base, and a plurality of connecting rods are fixed between the scissor mechanisms. At least one hydraulic cylinder is movably connected to the two connecting rods between the scissor mechanisms for adjusting the distance between the two connecting rods. The top and bottom of the scissor mechanism respectively include two pairs of sliding ends and hinged ends that can adjust the distance between each other to match the telescopic movement of the scissor mechanism. The top and bottom hinged ends are respectively hinged to the lifting platform and the base, and the top and bottom sliding ends are respectively slidably connected to the lifting platform and the base. The sliding end at the bottom of the scissor mechanism is provided with the self-locking mechanism for limiting its non-powered sliding.

[0006] Preferably, a first section of a piston rod that can be pushed out is provided inside the hydraulic cylinder, and a second section of a piston rod that can be pushed out is provided inside the first section of the piston rod.

[0007] Preferably, a retaining ring is provided on the inner wall of the top end of the first piston rod for blocking the second piston rod, the gap between the retaining ring and the second piston rod is smaller than the gap between the first piston rod and the second piston rod, and the bottom end of the second piston rod is provided with a radial hole and connected through the oil inlet hole.

[0008] Preferably, a one-way valve is provided in the radial hole, and the open end of the one-way valve extends to the outside of the second section of the piston rod. The one-way valve is composed of a valve core, a valve seat and a ejector pin. A steel ball is provided above the ejector pin to contact it. When the retaining ring hits the steel ball, the steel ball is affected by the pressure and presses against the ejector pin, causing the ejector pin to push open the valve core to create a gap therein, allowing the hydraulic oil in the oil inlet hole to flow out, thereby playing a limiting role.

[0009] Preferably, the lifting platform is a frame structure as a whole and is provided with platform guardrails on both sides that can be pushed out and retracted.

[0010] Preferably, the base is provided with lifting ears on the four corners.

[0011] Preferably, the self-locking mechanism is composed of a one-way rack and a stop block.

[0012] Preferably, the self-locking mechanism may also be composed of a screw and a gear, and one end of the screw may rotate coaxially with the gear in the gear pump.

[0013] Preferably, the hydraulic cylinder can be arranged in the base and connected to the movable side of the scissor mechanism. Beneficial effects

[0014] (III) Beneficial effects: Compared with the prior art, the present invention provides a scissor-type condenser pipe-threading hydraulic lifting platform, which has the following beneficial effects:

[0015] 1. The scissor-type condenser pipe-penetrating hydraulic lifting platform prevents the hydraulic cylinder and the working platform from sliding down due to their own weight or from overspeed descent or crashing due to pipeline rupture or leakage. The self-locking mechanism and the scissor-type mechanism are used in conjunction. When the lifting platform is descending, if the hydraulic cylinder ruptures and causes overspeed descent, the self-locking mechanism can be locked, so that the scissor-type mechanism that was originally able to move on one side is fixed, and the lifting platform can be stopped to avoid danger, thus eliminating safety hazards.

[0016] 2. The scissor-type condenser pipe-penetrating hydraulic lifting platform needs to be equipped with oil cylinder self-protection measures. Through the coordinated use of the retaining ring and the ejector pin, when the second section of the piston rod rises to the highest height, the retaining ring generates an extrusion force on the steel ball in contact with the top of the ejector pin, causing the ejector pin to push open the valve core, creating a gap with the valve seat. The hydraulic oil in the oil inlet hole flows out through the gap, reducing the pressure in the first section of the piston rod, causing the second section of the piston rod to stop rising, thus playing a limiting role.

[0017] 3. The scissor-type condenser pipe-threading hydraulic lifting platform has a self-locking mechanism that uses a screw and gear combination. The screw can drive the gear to rotate, but the gear cannot drive the screw to rotate. When the hydraulic cylinder is damaged, it can self-lock more quickly and promptly without any empty position. The operator will not fall or panic due to the drop of the empty position of the self-locking part, and the stability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of a first embodiment of the present invention;

[0019] FIG2 is a schematic structural diagram of a self-locking mechanism according to an embodiment of the present invention;

[0020] FIG3 is a schematic diagram of the structure of the hydraulic cylinder of the present invention;

[0021] FIG4 is a schematic cross-sectional view of the interior of the hydraulic cylinder of the present invention;

[0022] FIG5 is a schematic structural diagram of Embodiment 2 and Embodiment 3 of the present invention;

[0023] FIG6 is a schematic structural diagram of a self-locking mechanism according to a second embodiment of the present invention;

[0024] FIG7 is a schematic structural diagram of a self-locking mechanism according to a third embodiment of the present invention;

[0025] FIG8 is a schematic structural diagram of a fourth embodiment of the present invention;

[0026] FIG9 is a schematic diagram showing the connection between the self-locking mechanism and the hydraulic cylinder according to the fourth embodiment of the present invention.

[0027] In the figure: 2. Valve core; 3. Valve seat; 4. Ejector pin; 5. Steel ball; 7. Second section of piston rod; 8. First section of piston rod; 9. Retaining ring; 10. Hydraulic cylinder; 14. Oil inlet hole; 101. Self-locking mechanism; 201. Lifting eye; 301. Scissor mechanism; 401. Platform guardrail; 402. Lifting platform; 501. Base; 601. Gear pump. Modes for Carrying Out the Invention

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Embodiment 1: Please refer to Figure 1. The scissor-type condenser pipe-threading hydraulic lifting platform includes a base 501, a scissor-type mechanism 301, a hydraulic cylinder 10 and a lifting platform 402, and also includes a self-locking mechanism 101. The self-locking mechanism 101 is fixed on both sides of the bottom surface of the base 501. The lifting platform is horizontally arranged on the upper part of the base 501. Several connecting rods are fixed between the scissor-type mechanisms 301. At least one hydraulic cylinder 10 is movably connected to the two connecting rods between the scissor-type mechanisms 301 to adjust the distance between the two connecting rods. The top and bottom of the scissor-type mechanism 301 respectively include two pairs of sliding ends and hinged ends that can adjust the distance between each other to match the telescopic scissor-type mechanism. The hinged ends at the top and bottom are respectively hinged to the lifting platform 402 and the base 501. The sliding ends at the top and bottom are respectively hinged to the lifting platform 402 and the base 501. They are respectively slidably connected to the lifting platform 402 and the base 501. The sliding end of the bottom of the scissor mechanism 301 is provided with the self-locking mechanism 101 which limits its non-powered sliding. When the lifting platform 402 is to be raised, the movable side of the bottom end of the scissor mechanism 301 is retracted inward, so that the whole is extended in the vertical direction. At the same time, the hydraulic cylinder 10 is pushed out for support. When the lifting platform 402 descends, the movable side of the bottom end of the scissor mechanism 301 is pushed outward, so that the whole is shortened in the vertical direction, and the supporting hydraulic cylinder 10 is retracted. The self-locking mechanism 101 is used to self-lock and fix the movable side of the bottom end of the scissor mechanism 301 when the hydraulic cylinder 10 is damaged or causes it to descend due to its own weight, thereby supporting the overall scissor mechanism 301 and preventing the lifting platform 402 from falling sharply, which may cause danger.

[0030] Referring to FIG2 , the self-locking mechanism 101 is composed of a one-way rack and a check block. This structure is a one-way rack support structure. It provides support when the oil cylinder is deprived of oil for an extended period of time due to internal leakage in the oil line, which could cause the platform to descend due to its own weight, or when a pipeline crack or leak causes an overspeed descent or crash. The check block holds the one-way rack against the platform to prevent it from descending. When the platform needs to rise, the one-way rack and the check block have an oblong slideway, allowing the check block to move freely up and down. Therefore, the check block does not function and does not affect the platform's ascent. When the platform is stationary, the check block, due to its own weight, always fits against the one-way rack, causing the check block to press against the one-way teeth and prevent the platform from automatically descending. If the oil cylinder or oil pipeline bursts or leaks, the check block always fits against the one-way rack, preventing the platform from overspeeding or crashing.

[0031] 3 , a first section piston rod 8 that can be pushed out is provided inside the hydraulic cylinder 10 , and a second section piston rod 7 that can be pushed out is provided inside the first section piston rod 8 .

[0032] Referring to Figure 4, a retaining ring 9 is provided on the inner wall of the top end of the first piston rod 8 for blocking the second piston rod 7. The gap between the retaining ring 9 and the second piston rod 7 is smaller than the gap between the first piston rod 8 and the second piston rod 7. The bottom end of the second piston rod 7 is provided with a radial hole and is connected through the oil inlet hole 14.

[0033] A one-way valve is provided in the radial hole, and the open end of the one-way valve extends to the outside of the second section piston rod 7. The one-way valve is composed of a valve core 2, a valve seat 3 and a ejector pin 4. A steel ball 5 is provided above the ejector pin 4 to contact the one-way valve. During operation, oil begins to flow into the first section piston rod 8 through the oil inlet hole 14. The valve core 2 of the one-way valve is sealed with the valve seat 3 under the pressure of the return spring, that is, the oil inlet hole 14 and the one-way valve are sealed, and hydraulic oil cannot flow through the one-way valve. At this time, the one-way valve is in a normally closed state. As the hydraulic oil in the first section piston rod 8 increases, the second section piston rod 7 is continuously lifted. When the steel ball 5 in the second section piston rod 7 contacts the retaining ring 9, the steel ball 5 is squeezed by the retaining ring 9 and will press against the ejector pin 4. The ejector pin 4 pushes open the valve core 2, forming a gap between the valve core 2 and the valve seat 3. Therefore, the hydraulic oil can flow out from the gap between the valve core 2 and the valve seat 3, reducing the pressure in the first section piston rod 8 and causing the second section piston rod 7 to automatically stop rising. When the limit height is exceeded, the oil cylinder will automatically drain oil to ensure that the plunger cannot rush out of the oil cylinder, thereby playing a limiting role.

[0034] The lifting platform 402 is a frame structure as a whole and is provided with platform guardrails 401 on both sides that can be pushed out and retracted. When operating on some large tanks such as heat exchangers, there may be a certain distance from the lifting platform 402, and it is difficult for the staff to operate on the top. The platform guardrail 401 can be pushed out to increase the area of ​​the lifting platform 402 and the range that can be processed, so as to adapt to different work scenarios and needs, and at the same time it can be more beneficial for limited working space and equipment storage.

[0035] The base 501 is provided with lifting ears 201 at the four corners, which can be used for lifting and carrying, saving manpower and improving carrying efficiency.

[0036] Working principle: the movement of the stop block on the one-way rack drives the scissor lift mechanism 301 to retract and extend. At the same time, because the tooth direction of the one-way rack is toward the retracting side, when the hydraulic cylinder 10 is damaged or causes a drop due to its own weight, the movable side of the bottom end of the scissor lift mechanism 301 can be pressed against the one-way rack by the stop block to achieve self-locking fixation, thereby supporting the entire scissor lift mechanism 301 and preventing the lifting platform 402 from falling sharply, causing danger. At normal descending speed, the stop block can move upward through the circular slide to prevent self-locking. A retaining ring 9 for blocking the second piston rod 7 is provided on the inner wall of the top end of the first piston rod 8. When the second piston rod 7 rises, the open end of the one-way valve will be blocked by the retaining ring 9, so that the open end of the one-way valve will be subjected to the pressure of the steel ball 5, squeezing the ejector pin 4, and prompting the one-way valve to open through the ejector pin 4, so that the hydraulic oil pressure in the first piston rod 8 is reduced, that is, the automatic limit of the second movable rod 7 at the maximum stroke is achieved.

[0037] Example 2: Please refer to Figure 5. The scissor-type condenser pipe-threading hydraulic lifting platform includes a base 501, a scissor-type mechanism 301, a hydraulic cylinder 10 and a lifting platform 402, and also includes a self-locking mechanism 101. The self-locking mechanism 101 is fixed on both sides of the bottom surface of the base 501. The lifting platform is horizontally arranged on the upper part of the base 501. Several connecting rods are fixed between the scissor-type mechanisms 301. At least one hydraulic cylinder 10 is movably connected to the two connecting rods between the scissor-type mechanisms 301 to adjust the distance between the two connecting rods. The top and bottom of the scissor-type mechanism 301 respectively include two pairs of sliding ends and hinged ends that can adjust the distance between each other to match the telescopic scissor-type mechanism. The hinged ends at the top and bottom are respectively hinged to the lifting platform 402 and the base 501. The sliding ends at the top and bottom They are respectively slidably connected to the lifting platform 402 and the base 501. The sliding end of the bottom of the scissor mechanism 301 is provided with the self-locking mechanism 101 which limits its non-powered sliding. When the lifting platform 402 is to be raised, the movable side of the bottom end of the scissor mechanism 301 is retracted inward, so that the whole is extended in the vertical direction. At the same time, the hydraulic cylinder 10 is pushed out for support. When the lifting platform 402 descends, the movable side of the bottom end of the scissor mechanism 301 is pushed outward, so that the whole is shortened in the vertical direction, and the supporting hydraulic cylinder 10 is retracted. The self-locking mechanism 101 is used to self-lock and fix the movable side of the bottom end of the scissor mechanism 301 when the hydraulic cylinder 10 is damaged or causes it to descend due to its own weight, thereby supporting the overall scissor mechanism 301 and preventing the lifting platform 402 from falling sharply, which may cause danger.

[0038] Referring to Figure 6, the self-locking mechanism 101 is composed of a screw and a gear. The screw is driven by the motor to rotate, and the screw drives the gear to rotate, so that the gear drives the movable side of the scissor mechanism 301 to retract inward, so that the lifting platform 402 is raised as a whole. The motor drives the screw in reverse, so that the gear drives the movable side of the scissor mechanism 301 to pull outward, so that the lifting platform 402 at the other end is lowered as a whole. The rise and fall are achieved by driving the screw forward and reverse. At the same time, when the hydraulic cylinder 10 is damaged or drops due to its own weight, the movable side of the scissor mechanism 301 has a tendency to drive the gear to pull outward, but the friction between the threads will produce A reaction force is a component force perpendicular to the screw axis. This component force will always be in a direction that does not engage with the gear. The gear cannot drive the screw to rotate. If the screw does not rotate, the gear cannot rotate either, achieving self-locking. The screw gear self-locking structure usually has a large transmission ratio, which can convert high-speed and low-torque input into low-speed and high-torque output. This makes the screw gear self-locking structure particularly suitable for occasions that require large torque output. At the same time, due to the characteristics of the self-locking structure, the screw gear transmission can withstand large loads. These structures are usually made of high-strength and wear-resistant materials and can work under heavy loads and harsh environments.

[0039] The lifting platform 402 is a frame structure as a whole and is provided with platform guardrails 401 on both sides that can be pushed out and retracted. When operating on some large tanks such as heat exchangers, there may be a certain distance from the lifting platform 402, and it is difficult for the staff to operate on the top. The platform guardrail 401 can be pushed out to increase the area of ​​the lifting platform 402 and the range that can be processed, so as to adapt to different work scenarios and needs, and at the same time it can be more beneficial for limited working space and equipment storage.

[0040] The base 501 is provided with lifting ears 201 at the four corners, which can be used for lifting and carrying, saving manpower and improving carrying efficiency.

[0041] Working principle: Based on the friction and transmission force of the screw and gear, the screw is a transmission element with an axial thread, and the gear is a circumferential thread made based on the screw. Under normal operating conditions, the screw is rotated by applying external force or driving force. The friction between the threads will generate a reaction force perpendicular to the screw axis. This force component will always be in a direction that does not engage with the gear. The force component in this direction will effectively prevent the worm gear from reversing, achieving a self-locking effect. The whole can only be driven by the screw, and the gear cannot drive the screw, which can achieve self-locking more effectively and quickly.

[0042] Example 3: Please refer to Figure 5. The scissor-type condenser pipe-threading hydraulic lifting platform includes a base 501, a scissor-type mechanism 301, a hydraulic cylinder 10 and a lifting platform 402, and also includes a self-locking mechanism 101. The self-locking mechanism 101 is fixed on both sides of the bottom surface of the base 501. The lifting platform is horizontally arranged on the upper part of the base 501. Several connecting rods are fixed between the scissor-type mechanisms 301. At least one hydraulic cylinder 10 is movably connected to the two connecting rods between the scissor-type mechanisms 301 to adjust the distance between the two connecting rods. The top and bottom of the scissor-type mechanism 301 respectively include two pairs of sliding ends and hinged ends that can adjust the distance between each other to match the telescopic scissor-type mechanism. The hinged ends at the top and bottom are respectively hinged to the lifting platform 402 and the base 501. The sliding ends at the top and bottom They are respectively slidably connected to the lifting platform 402 and the base 501. The sliding end of the bottom of the scissor mechanism 301 is provided with the self-locking mechanism 101 which limits its non-powered sliding. When the lifting platform 402 is to be raised, the movable side of the bottom end of the scissor mechanism 301 is retracted inward, so that the whole is extended in the vertical direction. At the same time, the hydraulic cylinder 10 is pushed out for support. When the lifting platform 402 descends, the movable side of the bottom end of the scissor mechanism 301 is pushed outward, so that the whole is shortened in the vertical direction, and the supporting hydraulic cylinder 10 is retracted. The self-locking mechanism 101 is used to self-lock and fix the movable side of the bottom end of the scissor mechanism 301 when the hydraulic cylinder 10 is damaged or causes it to descend due to its own weight, thereby supporting the overall scissor mechanism 301 and preventing the lifting platform 402 from falling sharply, which may cause danger.

[0043] Referring to Figure 7, the self-locking mechanism 101 is composed of a screw and a gear. The screw is driven by the motor to rotate, and the screw drives the gear to rotate, so that the gear drives the movable side of the scissor mechanism 301 to retract inward, so that the lifting platform 402 is raised as a whole. The motor drives the screw in reverse, so that the gear drives the movable side of the scissor mechanism 301 to pull outward, so that the lifting platform 402 at the other end is lowered as a whole. The rise and fall are achieved by driving the screw forward and reverse. At the same time, when the hydraulic cylinder 10 is damaged or drops due to its own weight, the movable side of the scissor mechanism 301 has a tendency to drive the gear to pull outward, but the friction between the threads will produce A reaction force is a component force perpendicular to the screw axis. This component force will always be in a direction that does not engage with the gear. The gear cannot drive the screw to rotate. If the screw does not rotate, the gear cannot rotate either, achieving self-locking. The screw gear self-locking structure usually has a large transmission ratio, which can convert high-speed and low-torque input into low-speed and high-torque output. This makes the screw gear self-locking structure particularly suitable for occasions that require large torque output. At the same time, due to the characteristics of the self-locking structure, the screw gear transmission can withstand large loads. These structures are usually made of high-strength and wear-resistant materials and can work under heavy loads and harsh environments.

[0044] Referring to Figure 7, one end of the screw rotates coaxially with the gear in the gear pump 601. The rotation of the screw can not only drive the scissor mechanism 301 to retract and extend, but also control the hydraulic cylinder 10. By adjusting the thread pitch, synchronous control is achieved. Compared with the original separate independent control, it can reduce the occurrence of loss of control, make the operation simpler, consume less energy, make it easier to synchronize when the platform is raised and lowered, and make the overall more stable, and the service life can be effectively extended.

[0045] The lifting platform 402 is a frame structure as a whole and is provided with platform guardrails 401 on both sides that can be pushed out and retracted. When operating on some large tanks such as heat exchangers, there may be a certain distance from the lifting platform 402, and it is difficult for the staff to operate on the top. The platform guardrail 401 can be pushed out to increase the area of ​​the lifting platform 402 and the range that can be processed, so as to adapt to different work scenarios and needs, and at the same time it can be more beneficial for limited working space and equipment storage.

[0046] The base 501 is provided with lifting ears 201 at the four corners, which can be used for lifting and carrying, saving manpower and improving carrying efficiency.

[0047] Working principle: A gear in the gear pump 601 is coaxially arranged with the screw in the self-locking mechanism 101, and a gear in the gear pump 601 is driven by the screw. When the screw rotates, it drives the gear to rotate. When the scissors-fork mechanism 301 is retracted, the gear pump 601 rotates and works, and oil is supplied to the hydraulic cylinder 10, so that the first section piston rod 8 and the second section piston rod 7 are pushed out. When the scissors-fork mechanism 301 is pulled apart, the gear pump 601 rotates in the opposite direction, the hydraulic cylinder 10 withdraws oil, and the first section piston rod 8, which is provided with a second section piston rod 7 that can be pushed out, contracts, and the scissors-fork mechanism 301 and the hydraulic cylinder 10 move synchronously, so that the overall lifting platform 402 can be more stable during the movement and use process, while saving the energy consumed by the equipment.

[0048] Example 4: Please refer to Figures 8-9. The scissor-type condenser pipe-threading hydraulic lifting platform includes a base 501, a scissor-type mechanism 301, a hydraulic cylinder 10 and a lifting platform 402, and also includes a self-locking mechanism 101. The self-locking mechanism 101 is fixed on both sides of the bottom surface of the base 501. The lifting platform is horizontally arranged on the upper part of the base 501. Several connecting rods are fixed between the scissor-type mechanisms 301. At least one hydraulic cylinder 10 is movably connected to the two connecting rods between the scissor-type mechanisms 301 to adjust the distance between the two connecting rods. The top and bottom of the scissor-type mechanism 301 respectively include two pairs of sliding ends and hinged ends that can adjust the distance between each other to match the telescopic scissor-type mechanism. The hinged ends at the top and bottom are respectively hinged to the lifting platform 402 and the base 501. The sliding ends at the top and bottom The ends are respectively slidably connected to the lifting platform 402 and the base 501. The sliding end of the bottom of the scissor mechanism 301 is provided with the self-locking mechanism 101 which limits its non-powered sliding. When the lifting platform 402 is to be raised, the movable side of the bottom end of the scissor mechanism 301 is retracted inward, so that the whole is extended in the vertical direction, and the hydraulic cylinder 10 is pushed out for support. When the lifting platform 402 descends, the movable side of the bottom end of the scissor mechanism 301 is pushed outward, so that the whole is shortened in the vertical direction, and the supporting hydraulic cylinder 10 is retracted. The self-locking mechanism 101 is used to self-lock and fix the movable side of the bottom end of the scissor mechanism 301 when the hydraulic cylinder 10 is damaged or causes it to descend due to its own weight, thereby supporting the overall scissor mechanism 301 and preventing the lifting platform 402 from falling sharply, which may cause danger.

[0049] One end of the screw rotates coaxially with the gear in the gear pump 601. The rotation of the screw can not only drive the scissors mechanism 301 to retract and extend, but also control the hydraulic cylinder 10 by adjusting the thread pitch. Synchronous control is achieved by adjusting the thread pitch. Compared with the original separate independent control, it can reduce the occurrence of loss of control, make the operation simpler, consume less energy, make it easier to synchronize when the platform is raised and lowered, and make the overall operation more stable, and the service life can be effectively extended.

[0050] Placing the hydraulic cylinder 10 in the base 501 makes it more convenient to achieve synchronous control with the screw-driven scissor-type mechanism 301. At the same time, it has high space utilization for the base 501, has more advantages in limited working space and storage, can maintain a certain stability and rigidity, and has a certain supporting capacity for the scissor-type mechanism 301. The hydraulic cylinder 10 is also closer to the gear pump, which can optimize the hydraulic pipeline more concisely.

[0051] The lifting platform 402 is a frame structure as a whole and is provided with platform guardrails 401 on both sides that can be pushed out and retracted. When operating on some large tanks such as heat exchangers, there may be a certain distance from the lifting platform 402, and it is difficult for the staff to operate on the top. The platform guardrail 401 can be pushed out to increase the area of ​​the lifting platform 402 and the range that can be processed, so as to adapt to different work scenarios and needs, and at the same time it can be more beneficial for limited working space and equipment storage.

[0052] The base 501 is provided with lifting ears 201 at the four corners, which can be used for lifting and carrying, saving manpower and improving carrying efficiency.

[0053] Working principle: The hydraulic cylinder 10 is placed in the base 501 and connected to the movable end of the scissor mechanism 301, making it easier to achieve synchronous control using a screw. At the same time, the layout of the base 501 is more compact, the space utilization rate is greater, and the hydraulic pipeline is optimized to reduce the installation of additional equipment.

[0054] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A scissor-type condenser pipe-threading hydraulic lifting platform, comprising a base (501), a scissor-type mechanism (301), a hydraulic cylinder (10) and a lifting platform (402), characterized in that: It also includes a self-locking mechanism (101), the lifting platform is horizontally arranged on the upper part of the base (501), a plurality of connecting rods are fixed between the scissor-fork mechanisms (301), at least one of the hydraulic cylinders (10) is movably connected to the two connecting rods between the scissor-fork mechanisms (301) for adjusting the distance between the two connecting rods, the top and bottom of the scissor-fork mechanism (301) respectively include two pairs of sliding ends and hinged ends that can adjust the distance between each other to match the telescopic movement of the scissor-fork mechanism, the top and bottom hinged ends are respectively hinged to the lifting platform (402) and the base (501), the top and bottom sliding ends are respectively slidably connected to the lifting platform (402) and the base (501), and the sliding end at the bottom of the scissor-fork mechanism (301) is provided with the self-locking mechanism (101) for limiting its non-powered sliding.

2. The scissor-type condenser pipe-threading hydraulic lifting platform according to claim 1 is characterized in that: A first section of piston rod (8) that can be pushed out is provided inside the hydraulic cylinder (10), and a second section of piston rod (7) that can be pushed out is provided inside the first section of piston rod (8).

3. The scissor-type condenser pipe-threading hydraulic lifting platform according to claim 1 is characterized in that: A retaining ring (9) for retaining the second piston rod (7) is provided on the inner wall of the top end of the first piston rod (8); the gap between the retaining ring (9) and the second piston rod (7) is smaller than the gap between the first piston rod (8) and the second piston rod (7); and a radial hole is provided at the bottom end of the second piston rod (7) and is connected via an oil inlet hole (14).

4. The scissor-type condenser pipe-threading hydraulic lifting platform according to claim 1 is characterized in that: A one-way valve is provided in the radial hole, the open end of the one-way valve extending to the outside of the second piston rod (7), the one-way valve comprising a valve core (2), a valve seat (3) and a push pin (4), a steel ball (5) being provided above the push pin (4) to contact the steel ball (5), when the retaining ring (9) hits the steel ball (5), the steel ball (5) is affected by the pressure to press against the push pin (4), so that the push pin (4) pushes open the valve core (2) to generate a gap therein, so that the hydraulic oil in the oil inlet hole (14) flows out, thus playing a limiting role.

5. The scissor-type condenser pipe-threading hydraulic lifting platform according to claim 1 is characterized in that: The lifting platform (402) is a frame structure as a whole and is provided with platform guardrails (401) on both sides that can be pushed out and retracted.

6. The scissor-type condenser pipe-threading hydraulic lifting platform according to claim 1 is characterized in that: The base (501) is provided with lifting ears (201) at four corners.

7. The scissor-type condenser pipe-threading hydraulic lifting platform according to claim 1 is characterized in that: The self-locking mechanism (101) is composed of a one-way rack and a stop block.

8. The scissor-type condenser pipe-threading hydraulic lifting platform according to claim 1 is characterized in that: The self-locking mechanism (101) may also be composed of a screw and a gear, and one end of the screw may rotate coaxially with the gear in the gear pump (601).

9. The scissor-type condenser pipe-threading hydraulic lifting platform according to claim 1 is characterized in that: The hydraulic cylinder (10) may be arranged in the base (501) and connected to a movable side of the scissor mechanism (301).

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