What is a hydraulic rod?

Question 1: What is a hydraulic rod and what mechanism does it exist in? What's the role? Hydraulic rod is also called piston rod. It exists in the actuator and is used to output the force and stroke required by the hydraulic system.

The hydraulic rod is an element in the hydraulic cylinder, which is actually a smooth iron rod. Common cranes, excavators, forklifts and forklifts on the street all have hydraulic cylinders on them.

Question 2: What is the material of the hydraulic rod? Generally, 45# steel is used, and alloy steels such as GCr 15 and 40Cr can be used if the strength is required.

Question 3: What is the ring structure at the end of the hydraulic rod? Please give a photo, generally called piston head! It may also be a guide sleeve, or you are talking about a sealing ring and an oil seal.

Question 4: What machine is used to make the hydraulic rod? Electric power steering system (EPS) is one of the achievements of the development of automobile electronization, and it has been paid more and more attention in automobile manufacturing in various countries. EPS is a kind of power steering system, which is more controllable than the traditional power steering system and can better solve the contradiction between "light" steering and "intelligent" steering, so it has a broad application prospect [1]. Modeling and control are two key issues in performance simulation research [2]. The virtual prototype technology based on ADAMS software can regard the automobile as a multi-body system which is interconnected and can move relatively. Compared with the previous mathematical model of multi-degree-of-freedom mass damping rigid body (vibration), the calculation and description can truly reflect the structure and performance of the whole vehicle, and it is more direct and convenient than other methods [3]. Because of the complexity of EPS control algorithm and too many degrees of freedom of vehicle model, it is difficult to analyze the performance of vehicle-based EPS system with only one software. In this paper, a multi-functional commercial vehicle is taken as the object, the multi-body dynamic model of the whole vehicle system is established by using ADAMS/Car, and the EPS control system is established in Matlab. Using the combination of MATLAB and ADAMS software, the electric power steering control system is combined with the vehicle model, and the closed-loop control is formed between the mechanical subsystem and the control subsystem by using the interface provided by ADAMS/Controls, and the complex electromechanical integration real-time simulation is carried out. Using the advantages of the two softwares, the problems of too many degrees of freedom of vehicle model and too complicated algorithm of EPS control system are solved. Applied to practice, it can greatly reduce the development cycle and cost of vehicle control system. 1. Vehicle multi-body model is the premise of joint simulation, and the established multi-body model should reflect the real vehicle structure. Therefore, the following principles should be followed when establishing the vehicle overall dynamic system model in ADAMS/Car: (1) Simplify the important parts as much as possible when establishing the dynamic model, simplify the minor parts without affecting the system accuracy, reduce the degree of freedom as much as possible and improve the solving efficiency. (2) Except the tire, damping element, elastic element and rubber element, all other components are regarded as rigid bodies, and their deformation is not considered in the simulation analysis process; The spring-loaded mass is regarded as a rigid body with six degrees of freedom. (3) Properly simplify the connection flexibility between rigid bodies, and use linear elastic rubber bushing to simulate the dynamic characteristics under actual working conditions; Friction in each kinematic pair is ignored. (4) Because the engine module and braking system module are only used to control the vehicle speed, this paper adopts the engine and braking system module built in ADAMS/Car database. At the same time, the power transmission system is also simplified, and only the power transmission behind the half shaft is considered, that is, the driving torque is directly added to the driving half shaft. The multi-body dynamic model of a commercial vehicle created by ADAMS/Car is shown in figure 1, which consists of eight subsystems: suspension, body, steering, stabilizer bar, brake, transmission, tire and powertrain. (1) Steering system mainly includes steering wheel, steering shaft, steering column, steering transmission shaft, tie rod, rack-and-pinion steering gear, etc. In ADAMS, it can be established according to the corresponding connection relationship and the corresponding constraint pair. When establishing the steering system model, the steering column should be divided into two parts, and a rotating pair should be added to ensure that they can rotate relatively around its axis, and a torsion spring should be added at the disconnection point to make the stiffness of the torsion spring reach the effect of torsion bar spring, so as to accurately measure the torque exerted by the steering wheel during the simulation process. A force element is added to the steering rack to indicate the size of the assist. The initial value of the auxiliary function is set to 0, and the calculated value of EPS control system in MATLAB environment is read in real time by VARVAL function. (2) Body system: In order to simplify the modeling, the vehicle occupant and body are integrated into a model, and discrete particles are used to replace the continuum. The body model consists of five parts: no-load vehicle particles, driver particles, co-driver particles and occupant particles (4 people). By defining the mass of the co-pilot particle and the passenger particle, the carrying capacity of 1 ~ 6 passengers can be simulated respectively, and by defining the position of the center of mass of each particle, different mass distributions can be simulated. (3) Front axle and front suspension assembly: the front suspension is McPherson independent suspension ...

Question 5: How can the hydraulic rod on the bed be used to lift the bed? When installing the hydraulic rod, the contact pressure between the bed plate and the support point of the hydraulic rod is too high, which is easy to cause the bed plate to break when it is lifted. It is best to reconfigure the prone frame or choose a thicker bed board.

In a certain mechanical and electronic system, the hydraulic principle relies on the static pressure of liquid medium to complete the accumulation, transmission and amplification of energy, and realize the portability, scientificity and maximization of mechanical functions.

Using hydraulic principle, hydraulic transmission system and hydraulic control system can be built.

1. Hydraulic pump that converts mechanical energy into liquid (mainly oil) energy (mainly pressure energy)

2. Hydraulic control valve for regulating pressure energy

3. Hydraulic actuators (hydraulic motors, hydraulic cylinders and hydraulic rotary motors) that convert pressure energy into mechanical energy.

4. Hydraulic accessories necessary for transmitting pressure energy and regulating the liquid itself.

The basic function of hydraulic circuit is to transfer easily controlled energy in the form of liquid pressure energy.

In terms of energy transfer, hydraulic technology is roughly in the middle of mechanical energy transfer and electrical energy transfer.

In terms of transmission characteristics, mechanical transmission and hydraulic transmission can be said to have fixed characteristics. On the contrary, hydraulic transmission, like electric transmission, has the characteristics of stepless speed change device. In addition to constant power, it is easy to realize constant speed and constant torque.

This feature of hydraulic technology can be summarized as follows:

(1) It is easy to perform stepless speed change and has a wide speed change range, that is, the force and torque can be easily adjusted in a wide range;

(2) Good control performance, that is, the force, speed and position can be controlled correctly, and the response speed is fast. In addition, it has good adaptability to other control methods such as electricity and machinery, especially when it is combined with electric signal processing, it can get excellent response characteristics;

(3) Reliable action and good operation performance;

(4) Moderate flexibility in structure and characteristics;

(5) Standard components can be used to form a circuit for realizing any complex function.

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The reasons for these characteristics are: using volume elements as capacity converters, that is, hydraulic pumps and actuators, and using lubricating oil (hydraulic oil) as working medium. The common shortcomings of hydraulic technology are also related to hydraulic oil. These shortcomings can be summarized as follows:

(1) oil leakage;

(2) When special precision control is needed, the pollution of hydraulic oil has a bad influence on the characteristics of components and devices. In other words, the management of hydraulic oil has a great influence on the reliability and life of components.

Question 6: What is the structure of the hydraulic rod under the bed? Hydraulic rod, also known as gas spring, can't be repaired if it is broken. Because of its precise structure and good sealing performance, it can't be recovered by self-disassembly, and it can't be repaired by adding oil. It is recommended to replace. You can usually buy a pair for 60 yuan!

Question 7: What does the hydraulic lever of the range hood mean? The things on the panel and the opening and closing state of the supporting panel must be owned by the range hood with air inlets around it.

Question 8: What brand of hydraulic support rod is good? There are many brands of hydraulic support rods. Every manufacturer says that their products are good, but we can't ignore one factor. Expensive is not necessarily good, and cheap is not necessarily bad. Mainly depends on the environment and frequency of use. For example, if you use it for furniture beds, the frequency of indoor use is quite low. In this case, it is recommended to use low-priced products. If used in cars, you can choose to import high-end products. If used in mechanical doors and advertising light boxes, you can choose moderate prices. In fact, each brand has its own advantages and disadvantages. The key lies in our own expectations of products, and the most cost-effective one is the one that suits us best.

Taizhou Taibo gas spring provides the answer, I hope to adopt it, thank you.