A jacking cylinder control valve group

Abstract

The utility model discloses a kind of jacking oil cylinder control valve groups, including two jacking oil cylinders of symmetrical arrangement, it is characterized in that, displacement sensor is installed between the cylinder body of jacking oil cylinder and piston rod head, jacking oil cylinder side is provided control valve group, pressure transmitter is set on control valve group;Control valve group includes logic valve, overflow valve, high-pressure counterbalance valve, pipeline explosion-proof valve, low-pressure counterbalance valve, electric proportional speed regulating valve;By installing displacement sensor on each oil cylinder and integrating pressure transmitter on valve group, system can obtain the accurate position and stress data of double cylinder in real time;Combined with electric proportional speed regulating valve, the extension / retraction speed of each oil cylinder can be infinitely and accurately adjusted by remote electric signal;Multiple safety protection mechanism avoids abnormal high pressure and impact of system, reduces the risk of component damage, prolongs the service life of oil cylinder and entire hydraulic system.

Description

Technical Field

[0001] This utility model belongs to the field of crane technology, specifically relating to a lifting cylinder control valve group. Background Technology

[0002] In tower crane operation, jacking is the most dangerous operation, making the design of the jacking system particularly important. A typical jacking system consists of a jacking frame, a jacking pump station (including operating valve assemblies), jacking cylinders, cylinder control valve assemblies, and hydraulic pipe fittings. For large tower cranes, a dual-cylinder synchronous jacking scheme is widely used due to its advantages of ensuring structural stress and easy control of eccentric loads. The jacking cylinder control valve assembly is a key design element, requiring both uniform and safe force distribution on each cylinder and synchronized speed control of both cylinders. A well-designed system ensures safety, reliability, ease of operation, and reduces the risks associated with jacking operations. Utility Model Content

[0003] The purpose of this invention is to provide a lifting cylinder control valve assembly to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a lifting cylinder control valve group, comprising two symmetrically arranged lifting cylinders, characterized in that a displacement sensor is installed between the cylinder body and the piston rod head of the lifting cylinder, a control valve group is provided on one side of the lifting cylinder, and a pressure transmitter is provided on the control valve group; The control valve group includes a logic valve, a relief valve, a high-pressure counterbalance valve, a pipeline explosion-proof valve, a low-pressure counterbalance valve, and an electro-proportional speed control valve. Port 2 of the logic valve is connected to port 1 of the high-pressure counterbalance valve and the pipeline explosion-proof valve. Port 1 of the logic valve is connected to port 1 of one of the relief valves. Port 3 of the logic valve is connected to ports 2 of both relief valves. Port 3 of the high-pressure counterbalance valve is connected to port 3 of the low-pressure counterbalance valve and port 1 of the electro-proportional speed control valve. Port 2 of the high-pressure counterbalance valve is connected to ports 2 of the low-pressure counterbalance valve.

[0005] Preferably, the lifting cylinder is mounted on the lifting sleeve.

[0006] Preferably, the control valve assembly is connected and fixed to the lifting cylinder using a steel pipe.

[0007] The technical effects and advantages of this utility model are as follows: 1. By installing displacement sensors on each cylinder and integrating pressure transmitters on the valve group, the system can obtain the precise position and force data of the two cylinders in real time. Combined with the electro-proportional speed control valve, the extension / retraction speed of each cylinder can be steplessly and precisely adjusted via remote electrical signals; the control system can automatically or manually adjust the opening of the electro-proportional valve based on feedback from the displacement sensor, effectively correcting the asynchrony deviation of the two cylinders and ensuring a smooth and precise lifting process.

[0008] 2. The high-pressure counterbalance valve ensures that the hydraulic cylinder can maintain a stable and controllable descent when retracting under load, regardless of speed changes, to prevent stalling; When the pipeline explosion-proof valve detects a sudden drop in downstream pipeline pressure (such as a rupture), it can instantly shut off the oil circuit, lock the position of the oil cylinder, and prevent heavy objects from falling. The relief valve sets the maximum pressure for the rodless chamber and the rod chamber respectively, effectively preventing damage to the hydraulic cylinder due to overload or impact pressure; The logic valve acts as the main safety lock for the rodless chamber, preventing the hydraulic lock from failing; the low-pressure counterbalance valve is specifically designed to prevent the cylinder piston rod from accidentally extending due to its own weight, providing a reliable locking function when stationary.

[0009] 3. All functional valves (logic valves, relief valves, counterbalance valves, etc.) are built into a carbon steel forged valve body in the form of cartridge valve cores, forming a highly integrated "control valve group". This design greatly simplifies the external pipeline connection, reduces leakage points, makes installation and maintenance more convenient, and has a compact overall structure. It is resistant to high pressure and is very suitable for use in industrial sites with limited space and harsh environments.

[0010] 4. Multiple safety protection mechanisms prevent abnormal high pressure and impact in the system, reduce the risk of component damage, and extend the service life of the cylinder and the entire hydraulic system. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating the principle of this utility model; Figure 2 This is a schematic diagram of the control valve assembly of this utility model. Detailed Implementation

[0012] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0013] This utility model provides, for example Figure 1The diagram illustrates a lifting cylinder control valve assembly, comprising two symmetrically arranged lifting cylinders II, each fixed to a lifting sleeve. The key feature is that a displacement sensor I is installed between the cylinder body and the piston rod head of each lifting cylinder. A control valve assembly III is located on one side of each lifting cylinder II, connected and fixed to the lifting cylinder II via a steel pipe. A pressure transmitter IV is installed on the control valve assembly III; the pressure transmitter acquires the force information of each lifting cylinder II. The control valve assembly III is surrounded by corresponding connecting pipelines, as shown in the attached diagram. Figure 2 In the diagram, A, B, T, D, F, A1, B1, MA, and MB are all connection interfaces.

[0014] like Figure 2 As shown, the control valve group III includes a logic valve ①, a relief valve ②, a high-pressure counterbalancing valve ③, a pipeline explosion-proof valve ④, a low-pressure counterbalancing valve ⑤, and an electro-proportional speed control valve ⑥. Port 2 of the logic valve ① is connected to port 1 of the high-pressure counterbalancing valve ③ and the pipeline explosion-proof valve ④. Port 1 of the logic valve ① is connected to port 1 of one of the relief valves ②, interface A1, and interface MA, and is connected to the rodless chamber of the lifting cylinder II through interface A1. It is also connected to the pressure transmitter IV through interface MA. Port 3 of the logic valve ① is connected to ports 2 of the two relief valves ②. Port 3 of the high-pressure counterbalancing valve ③ is connected to port 3 of the low-pressure counterbalancing valve ⑤ and port 1 of the electro-proportional speed control valve ⑥. Port 2 of the high-pressure counterbalancing valve ③ is connected to ports 2 of the low-pressure counterbalancing valve ⑤. Port 1 of the low-pressure counterbalancing valve ⑤ is connected to interface B1, and is connected to the rod chamber of the lifting cylinder II through interface B1.

[0015] Control valve group III uses a forged carbon steel valve body with a high-pressure resistant design. All hydraulic components use cartridge valve cores, built into control valve group III, with a compact structure and convenient installation. The functions of each valve core are as follows: Logic valve ① is used for the safety locking of the rodless chamber (load chamber) of the cylinder; relief valve ② is used to control the maximum pressure (greater than the working pressure) of the rodless and rod chambers of the cylinder, ensuring that the cylinder will not be used under overpressure; high-pressure counterbalancing valve ③ ensures smooth cylinder retraction under load and stable cylinder retraction at different speeds; pipeline explosion-proof valve ④ automatically closes the oil circuit when the external pipeline bursts, ensuring that the cylinder will not automatically discharge oil and retract, thus preventing uncontrolled lifting action; low-pressure counterbalancing valve ⑤ is used to lock the cylinder rod, preventing the cylinder rod from drooping and extending due to its own weight; electro-proportional speed control valve ⑥ is used for asynchronous adjustment of the two cylinders when the cylinders are operating under no-load conditions. Based on the values ​​fed back by the cylinder displacement sensor, it is controlled by a remote electrical control handle to ensure that the speed of the two cylinders is within a reasonable range.

[0016] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A lifting cylinder control valve assembly, comprising two symmetrically arranged lifting cylinders, characterized in that, A displacement sensor is installed between the cylinder body and the piston rod head of the lifting cylinder. A control valve group is set on one side of the lifting cylinder, and a pressure transmitter is installed on the control valve group. The control valve group includes a logic valve, a relief valve, a high-pressure counterbalance valve, a pipeline explosion-proof valve, a low-pressure counterbalance valve, and an electro-proportional speed control valve. Port 2 of the logic valve is connected to port 1 of the high-pressure counterbalance valve and the pipeline explosion-proof valve. Port 1 of the logic valve is connected to port 1 of one of the relief valves. Port 3 of the logic valve is connected to ports 2 of both relief valves. Port 3 of the high-pressure counterbalance valve is connected to port 3 of the low-pressure counterbalance valve and port 1 of the electro-proportional speed control valve. Port 2 of the high-pressure counterbalance valve is connected to ports 2 of the low-pressure counterbalance valve.

2. The lifting cylinder control valve assembly according to claim 1, characterized in that: The lifting cylinder is mounted on the lifting sleeve.

3. The lifting cylinder control valve assembly according to claim 1, characterized in that: The control valve assembly is connected and fixed to the lifting cylinder using steel pipes.

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