The Composition of the Adjustable Stand Up Desk

As people place more emphasis on healthy and comfortable work environments, adjustable stand up desk are becoming more and more popular. The popularity of height-adjustable desks is not only due to the improvements in health and work efficiency they bring, but also due to the growth of market demand, technological progress and product innovation, market competition and promotion, and the influence of global trends.

Although many people use adjustable stand up desk, they don`t know anything about adjustable stand up desk. Of course, if you are just using it for personal use, you don`t need to know much. But if you are a businessman who sells adjustable stand up desk, office furniture dealers or furniture store owners, etc., you have a comprehensive understanding of the products you sell. It is important for you to choose an excellent adjustable stand up desk supplier. Traders are a big help. We are an adjustable stand up desk supplier in China. Let me analyze the components of an electric stand up desk for you. I hope this article can help you learn more about adjustable stand up desks.

The adjustable stand up desk is mainly divided into two parts, one is the desk frame and the other is the desktop. The desk frame is divided into: motor group, transmission structure (worm, worm gear), screw, NUT, inner, middle and outer tubes, other brackets and control systems, etc.

<1> Adjustable Stand Up Desk Motor Set

The motor model used in our adjustable stand up desk is 3045, 45 refers to the outer diameter of the motor, and 30 refers to the outer diameter of the silicon steel sheet. To reduce motor noise, you must run the entire motor without load, especially the carbon brush. "Our motor group will run in for one hour each in forward and reverse rotation." Stand up desk motors on the market have external or built-in reduction gears, and the gearboxes are made of plastic or metal. "Our motors use built-in worm gears and metal gearboxes" which are more stable and safe.

How an Adjustable Stand Up Desk Motor Works

The current passes through the commutator and the coil on the rotor. The energized coil generates a magnetic field, which cuts the magnetic field lines to generate an electromotive force, causing the motor to rotate. When the motor rotates, the carbon brushes connect the commutators at different positions to continuously generate thrust.

Appearance View of Adjustable Stand Up Desk Motor

Introduction to Adjustable Stand Up Desk Motor Brake

One end of the motor's rotor is a spiral worm (to be combined with the reduction gearbox), and the other end is an optical shaft. This shaft is straight through and exposes the rear end of the motor. To prevent the brake structures from sliding against each other, the brake cover needs to be removed from the shaft. The two are locked with screws, and the braking structure (brake spring, brake pad) and other combinations produce the braking function.

The Function of the Adjustable Stand Up Desk Motor Brake

When the adjustable stand up desk product is retracted, to avoid external pressure and a large lead angle, which may cause the retraction speed to be too fast and cause the motor to generate an induced electromotive force impact, a brake spring is used to slow down the product.

Principle: When the motor rotates, the motor generates friction with the brake spring and brake pad.

What is the Self-Locking Feature of an Adjustable Stand Up Desk:

When the motor is not powered on, the electric stand up desk column is still under load. Due to the friction between the NUT and the screw, the brake spring generates braking force, and there is also resistance inside the motor (from large to small resistance), so the load must exceed a certain The weight will cause the push rod to retract/slide, and this load is called self-locking force.

<2> Adjustable Stand Up Desk Reduction Gearbox (Worm Gear, Worm)

Advantages: Basically, only a first-order gear can achieve a large reduction ratio. For example, a single-tooth shaft with a 39-tooth worm gear can achieve a reduction ratio of 39:1, and the meshing of the worm and worm gear is a sliding mesh, with good efficiency and low noise. Minimum.

Disadvantages: The direction of the motor and the tube group is perpendicular, and the width is too large. The worm gear material is not resistant to high temperatures, and the duty cycle is only 10%.

Note: Duty cycle 10% means that after working continuously for 10% of the time, you need to rest for 90% of the time, with a maximum of 2 minutes of continuous work at a time.

<3> Adjustable Stand Up Desk Screw

The types of screws available for adjustable stand up desks are:

<3.1.1> Acme screw thread: trapezoidal thread, easy to manufacture and high in strength. It is the type of screw currently used by our company.

<3.1.2> Ball screw: Ball screw uses steel balls on the contact surface between the inside of the NUT and the screw to change the two from contact sliding to rolling friction, so it is more labor-saving and has higher precision.

The screw materials of adjustable stand up desks are:

S25C carbon steel is a high-quality carbon steel. S25C is a grade in the Japanese JIS standard, which is equivalent to the national standard 25 steel. Ingredients: The main components of S25C: C: 0.22~0.28; Si: 0.15~0.35; Mn: 0.3~0.6; P<0.03; S<0.03

<4> Adjustable Stand Up Desk NUT

NUT material: DuPont 100. POM 100 is an injection-grade engineering material produced by DuPont in the United States.

Application scope: POM (polyoxymethylene resin) definition: Polyoxymethylene is a linear polymer with no side chains, high density and high crystallinity. According to the different chemical structures in its molecular chain, it can be divided into two types: homopolymer and copolymer. The important difference between the two is that homopolyoxymethylene has high density, crystallinity, and melting point, but has poor thermal stability, a narrow processing temperature range (about 10°C), and slightly lower stability to acids and alkalis; while copolymer acetal has high density, crystallinity, and It has low melting point and strength, but has good thermal stability, is not easy to decompose, has a wide processing temperature range (about 50°C), and has good stability against acids and alkalis. It is an engineering plastic with excellent comprehensive properties. It has good physical, mechanical and chemical properties, especially excellent friction resistance. Commonly known as Saigang or Duugang, it is the third largest general-purpose plastic. Suitable for making wear-reducing and wear-resistant parts, transmission parts, chemical industry, instrumentation and other parts.

<5> Electric Lifting Column Legs

The material of the electric lifting column legs is: Q235, Q235 ordinary carbon structural steel, also called A3 steel.

Q represents the yield limit of this material, and the following 235 refers to the yield value of this material, which is around 235MPa. And as the thickness of the material increases, its yield value decreases. Because the carbon content is moderate, the overall performance is good, the strength, plasticity and welding properties are well matched, and it is the most widely used.

<6> Stand Up Desk Frame

The material used for the adjustable standing desk stand is: SPCC. SPCC was originally the name of the steel material of "general cold-rolled carbon steel sheets and strips" of the Japanese Standard (JIS) (such as Baosteel Q/BQB402 standard has SPCC), S (Steel) means steel; P (Plate) means plate; C (Cool) means cold rolling; C - common grade (Common), D - stamping grade (Draw), E - deep drawing grade (Elongation).

<7> Adjustable Stand Up Desk Control System

During the lifting process, the electric adjustable stand up desk encounters obstacles and causes damage to the smart electric stand up desk or the obstacles. In the existing technology, if it is necessary to implement resistance protection, it is usually necessary to add an external sensor to the stand up desk, and then detect the change value of the external sensor signal through the MCU microcontroller, and then control the driving mechanism of the stand up desk through the MCU microcontroller. Control to achieve the function of protection against obstruction.

Using the above method of installing external sensors will bring new problems. First of all, it is difficult to install external sensors. The installation location must be selected in a suitable place. Otherwise, false alarms may often occur during the normal lifting process of the electric stand up desk. ; Secondly, if you want to improve the high sensitivity of resistance protection, you need high-precision sensors.

<8> Introduction to the Synchronization Function of Adjustable Stand Up Desks

When the weight on the stand up desk is unevenly distributed, the column with more load will extend slower, so the synchronization function is designed to detect the signal of the hall sensor and use PWM to control the column to move at the same speed. Absolute synchronization means that the tabletop always maintains a horizontal state as it rises and falls. For example, when adjusting the height, the columns rise and fall simultaneously.

PWM technology is a method of digitally encoding the level of an analog signal. By using a high-resolution counter (modulation frequency), the duty cycle of the square wave is modulated, thereby encoding the level of an analog signal.

Note: PWM is the abbreviation of Pulse Width Modulation. Its Chinese name is pulse width modulation. One way to say it is that it uses the digital output of a microprocessor to control analog circuits. It is an effective technology. In fact, it uses digital signals to achieve The effect of an analog signal.