Series variable-diameter air cylinder with large pressure interval
By designing a series-connected variable-diameter cylinder with large and small diameter cylinder bodies, and using a three-position five-way central leakage solenoid valve to control the position of the piston and rod, the problem of limited pressure range of traditional cylinders is solved, achieving stability and smoothness in the welding process, adapting to various welding parameters, and possessing high innovation and versatility.
Patent Information
- Application Number
- CN202422777671.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-14
AI Technical Summary
Traditional tandem cylinders have a limited pressure range, which leads to unstable gas pressure during welding. Especially under low gas pressure, the operation is not smooth and it is difficult to achieve stepless adjustment.
A series variable-diameter cylinder consisting of large-diameter and small-diameter cylinder bodies was designed. The position of the upper, lower, and upper pull rods and piston is controlled by a three-position five-way central leakage solenoid valve to achieve pressure regulation. An air circuit system with a pressure range of 0.3MPa-0.5MPa is adopted to avoid cylinder shaft jamming or impact.
It achieves stepless adjustment over a wider pressure range, resulting in a smoother welding process, adaptability to various welding parameters, stable cylinder operation, high innovation and versatility, and reduced energy consumption.
Smart Images
Figure CN223536661U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of welding technology and relates to a welding cylinder, specifically a series variable diameter cylinder with a large pressure range. Background Technology
[0002] Resistance welding machines are mainly used for welding steel and aluminum alloys. Due to differences in materials and plate thickness, the required welding pressure varies greatly. The cylinder primarily provides pressure to the welding machine, and its pressure level is closely related to the welding quality.
[0003] The pressure required for welding is typically between 2kN and 15kN, a wide range. Traditional tandem cylinders, due to limitations in cylinder diameter and air circuit system, have a limited pressure range. For example, a 140mm diameter tandem cylinder can only move within a range of 6kN to 15kN, which is quite restrictive, and its movement is sluggish at low pressures. Therefore, a larger air circuit system with smoother movement is needed.
[0004] Traditional double-stroke tandem cylinders are mainly pressurized by two pistons simultaneously, and cannot be pressurized individually. Since the two cylinders have the same diameter, the small opening position is achieved by the pressure difference of the air. The air source is generally 0.6MPa, but most welding air pressure is in the range of 0.2MPa-0.5MPa. During operation, there will be problems with the smooth operation at low air pressure, making it very difficult to achieve stepless adjustment within a certain pressure range. Summary of the Invention
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a series variable diameter cylinder with a large pressure range that meets welding requirements and is easy to implement.
[0006] The technical problem solved by this utility model is achieved through the following technical solution:
[0007] A series variable-diameter cylinder with a large pressure range is characterized by comprising a large-diameter cylinder body, a small-diameter cylinder body, an upper piston, a middle piston, a lower piston, an upper pull rod, a middle pull rod, a lower pull rod, a three-position five-way central leakage solenoid valve, and a muffler. The upper piston and the middle piston are disposed in the large-diameter cylinder body. An upper pull rod extending from the top of the large-diameter cylinder body is connected to the upper piston. A middle pull rod extending from the bottom of the large-diameter cylinder body and entering the small-diameter cylinder body is connected to the middle piston. The small-diameter cylinder body is connected to and installed at the bottom of the large-diameter cylinder body. A lower piston is disposed in the small-diameter cylinder body. A lower pull rod extending from the bottom of the small-diameter cylinder body is connected to the lower piston.
[0008] The upper pull rod is a hollow rod body. A three-position five-way central leakage solenoid valve is connected to the top of the hollow rod body and the top opening of the large-diameter cylinder body. A three-position five-way central leakage solenoid valve is connected to the openings at the upper and lower two diagonal corners of the small-diameter cylinder body. The muffler is installed at the bottom of the large-diameter cylinder body.
[0009] Furthermore, a limit block is installed at the top of the upper pull rod.
[0010] Furthermore, the middle tie rod extends and retracts between the large-diameter cylinder and the small-diameter cylinder through a sealing structure, and the lower tie rod extends and retracts inside and outside the small-diameter cylinder through a sealing structure.
[0011] The advantages and positive effects of this utility model are:
[0012] 1. This series of variable-diameter cylinders, with a large pressure range, adjusts the welding pressure by controlling the inlet and outlet of the three-position five-way central leakage solenoid valves at openings I and II, and at openings III and IV, thereby changing the positions of the connecting rods and pistons. The two cylinders can operate independently or simultaneously, allowing for a wider pressure range adjustment to accommodate more welding parameters.
[0013] Below 0.3MPa, the cylinder shaft is prone to jamming; above 0.5MPa, the cylinder shaft experiences excessive impact. The pneumatic system of this invention can preferentially select a pressure value within the range of 0.3MPa-0.5MPa within a certain range. This range results in smoother cylinder operation and avoids the problems of cylinder shaft jamming or excessive impact caused by using pressure limits.
[0014] This invention can be applied to welding machines with various welding power, thereby maximizing the universality of cylinders and providing significant guidance for energy conservation and consumption reduction.
[0015] 2. This utility model has a scientific and reasonable design, with the advantages of a large pressure range, meeting welding requirements, and being easy to implement. It is a highly innovative series variable diameter cylinder with a large pressure range. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model;
[0017] Figure 2 This is a schematic diagram of the structure of the present invention at the open position;
[0018] Figure 3 This is a structural schematic diagram of the small opening position of this utility model;
[0019] Figure 4 This is a structural schematic diagram of the individual pressurization position of the large-diameter cylinder of this utility model;
[0020] Figure 5 This is a structural schematic diagram of the individual pressurization position of the small-diameter cylinder of this utility model;
[0021] Figure 6 This is a structural schematic diagram of the pressurization positions of the large-diameter cylinder and the small-diameter cylinder of this utility model.
[0022] Explanation of reference numerals in the attached figures
[0023] 1-Upper pull rod, 2-Upper piston, 3-Middle piston, 4-Middle pull rod, 5-Lower piston, 6-Lower pull rod, 7-Limit block, 8-Large diameter cylinder, 9-Small diameter cylinder. Detailed Implementation
[0024] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:
[0025] An innovative series variable diameter cylinder with a large pressure range includes: a large diameter cylinder body 8, a small diameter cylinder body 9, an upper piston 2, a middle piston 3, a lower piston 5, an upper pull rod 1, a middle pull rod 4, a lower pull rod 6, a three-position five-way central leakage solenoid valve, and a muffler IV. The upper piston and the middle piston are arranged in the large diameter cylinder body. An upper pull rod extending from the top of the large diameter cylinder body is connected to the upper piston. A middle pull rod extending from the bottom of the large diameter cylinder body and entering the small diameter cylinder body is connected to the middle piston. The small diameter cylinder body is connected to the bottom of the large diameter cylinder body. A lower piston is arranged in the small diameter cylinder body. A lower pull rod extending from the bottom of the small diameter cylinder body is connected to the lower piston.
[0026] The upper pull rod is a hollow rod body. A three-position five-way central leakage solenoid valve is connected to the top opening I of the hollow rod body and the top opening II of the large-diameter cylinder body. A three-position five-way central leakage solenoid valve is connected to the bottom opening III of the small-diameter cylinder body and the top opening V of the small-diameter cylinder body. The bottom opening III and the top opening V are diagonally arranged. The muffler is installed at the bottom opening IV of the large-diameter cylinder body to balance atmospheric pressure.
[0027] A limit block 7 is installed at the top of the upper pull rod.
[0028] The middle tie rod extends and retracts between the large-diameter cylinder and the small-diameter cylinder through a sealing structure, and the lower tie rod extends and retracts inside and outside the small-diameter cylinder through a sealing structure.
[0029] Because of the difference in cylinder diameter, this invention eliminates the need for a pressure difference, allowing the cylinder to operate within a pressure range of 0.2MPa-0.6MPa. The upper pull rod is hollow, allowing gas to enter and exit through a three-position five-way central vent solenoid valve. The smaller diameter cylinder allows for stepless adjustment within a narrow pressure range; the larger diameter cylinder allows for stepless adjustment within a wider pressure range; the combined pressure of both allows for even greater stepless adjustment. Furthermore, a pressure value within the 0.3MPa-0.5MPa range is preferred, as cylinder operation is smoothest within this range.
[0030] Taking a 160mm large-diameter cylinder and a 110mm small-diameter cylinder as examples, the pressure values they can generate are shown in the table below:
[0031]
[0032] Pneumatic system operation: The welding process mainly involves three position states: fully open, partially open, and welding position. The fully open position is used to avoid the workpiece, the partially open position is used to prepare for welding, and the welding position is used to output pressure. In the fully open and partially open positions, the pneumatic circuit on / off states are the same. The welding position includes three pneumatic circuit on / off states, as detailed below:
[0033] Fully open position: Bottom opening III allows ventilation, top opening V allows exhaust, and the three-position five-way venting solenoid valves at top opening I and top opening II allow venting; the upper rod, upper piston, middle rod, and middle piston are in a free state, and the lower rod, together with the lower piston, pushes the upper rod, upper piston, middle rod, and middle piston upward.
[0034] In the slightly open position: top opening II and bottom opening III allow ventilation, while top opening I and top opening V allow exhaust; the upper connecting rod and upper piston move downwards, the lower piston and lower connecting rod move upwards, and the middle connecting rod and middle piston are sandwiched in the middle. Due to the pressure difference caused by the different cylinder diameters, and the downward limitation by the limit block, they are in a state of... Figure 3 The state shown.
[0035] Welding position status:
[0036] In the individual pressurization position of a large-diameter cylinder: top opening I allows air in, top opening II allows exhaust, and bottom opening III and top opening V allow air leakage. Due to the reaction force, the upper connecting rod and upper piston move upward; if air continues to flow, the middle connecting rod, middle piston, lower connecting rod, and lower piston move downward together.
[0037] In the individual pressurization position of a small-diameter cylinder: top opening V allows ventilation, bottom opening III allows exhaust, and top openings I and II allow intermediate venting. The upper connecting rod, upper piston, middle connecting rod, and middle piston are in a free state, while the lower connecting rod and lower piston have moved downwards.
[0038] Twin-cylinder pressurization position: Top opening I and top opening V allow ventilation, top opening II and bottom opening III allow exhaust. Upper pull rod and upper piston move upward, middle pull rod and middle piston move downward.
[0039] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.
Claims
1. A series variable-diameter cylinder with a large pressure range, characterized in that: The system includes a large-diameter cylinder body, a small-diameter cylinder body, an upper piston, a middle piston, a lower piston, an upper pull rod, a middle pull rod, a lower pull rod, a three-position five-way central leakage solenoid valve, and a muffler. The upper piston and the middle piston are installed in the large-diameter cylinder body. An upper pull rod extending from the top of the large-diameter cylinder body is connected to the upper piston. A middle pull rod extending from the bottom of the large-diameter cylinder body and entering the small-diameter cylinder body is connected to the middle piston. The small-diameter cylinder body is connected to the bottom of the large-diameter cylinder body. A lower piston is installed in the small-diameter cylinder body. A lower pull rod extending from the bottom of the small-diameter cylinder body is connected to the lower piston. The upper pull rod is a hollow rod body. A three-position five-way central leakage solenoid valve is connected to the top of the hollow rod body and the top opening of the large-diameter cylinder body. A three-position five-way central leakage solenoid valve is connected to the openings at the two opposite corners of the small-diameter cylinder body. The muffler is installed at the bottom of the large-diameter cylinder body.
2. The tandem variable-diameter cylinder with a large pressure range according to claim 1, characterized in that: A limit block is installed at the top of the upper pull rod.
3. A series variable-diameter cylinder with a large pressure range according to claim 1, characterized in that: The middle tie rod extends and retracts between the large-diameter cylinder and the small-diameter cylinder through a sealing structure, and the lower tie rod extends and retracts inside and outside the small-diameter cylinder through a sealing structure.