The working principle of the instantaneous safety clamp is based on a simple and efficient design concept. When the machine room freight elevator loses control of the car speed due to sudden conditions, such as transmission component failure, control system abnormality, etc., and exceeds the pre-set action speed threshold of the speed limiter, the speed limiter responds immediately. The speed limiter triggers the lifting mechanism of the instantaneous safety clamp through a series of mechanical connections. The lifting mechanism acts quickly to push the brake element of the safety clamp, usually a special wedge, so that it is in close contact with the elevator guide rail at a very high speed. Due to the extremely rapid action, a strong friction force is instantly generated between the wedge and the guide rail. With this strong friction force, the car can be stopped in an emergency in a very short time, avoiding catastrophic accidents such as car falling caused by overspeeding.

From a structural point of view, the instantaneous safety clamp is relatively simple. It is mainly composed of a brake wedge, a lifting mechanism and some necessary connecting parts. The brake wedge is the core component to achieve the braking function. It is usually made of special high-strength wear-resistant materials to ensure that it can withstand huge friction and impact forces during emergency braking. The lifting mechanism is responsible for quickly and effectively pushing the brake wedge to the guide rail after the speed limiter is triggered. The entire structure is compact and the number of parts is relatively small, which makes the instantaneous safety clamp have certain advantages in manufacturing cost and installation and maintenance. For example, in some small machine room freight elevators, due to limited space, the simple instantaneous safety clamp structure is easier to adapt and is convenient for installation and subsequent maintenance personnel to inspect and repair operations.

However, the instantaneous safety clamp also has obvious limitations. The biggest problem is that its instantaneous braking method will generate a large impact force. When the car is running at high speed and is suddenly braked by the instantaneous safety clamp, huge kinetic energy is consumed in a very short time, which will inevitably cause the car, guide rails and transported goods to bear strong impact forces. For the car, excessive impact force may cause the car structure to deform, affecting its subsequent normal use and safety. The guide rails may also be worn, deformed or even damaged due to the inability to withstand such huge pressure at the moment, which will not only affect the normal operation of the elevator, but also may cause other safety hazards. The transported goods are also at risk, especially those that are fragile, fragile or sensitive to vibration, which are very likely to be damaged under the strong impact force.

In actual application scenarios, instantaneous safety clamps are generally suitable for machine room freight elevators with low speed and small load. For example, in some small factories, their cargo transportation needs are relatively simple, the elevator running speed is usually not high, and the cargo capacity is also limited. This type of elevator uses instantaneous safety clamps, which can not only meet the basic safety braking needs, but also reduce the overall equipment procurement and maintenance costs due to its simple structure and low cost. However, in large commercial centers or industrial plants, if the cargo is transported frequently, the load is large and the elevator runs at a high speed, considering the impact force of the instantaneous safety clamp, it is often not chosen, but rather a safety device such as a progressive safety clamp that can provide a smoother braking effect.

In order to maximize the advantages of the instantaneous safety clamp and reduce its negative effects, there are many key points to pay attention to during the design and use process. During the design phase, engineers need to accurately calculate and adjust the parameters of the safety clamp, including the size, shape, material of the brake wedge and the triggering force of the lifting mechanism, according to the actual operating parameters of the elevator, such as speed and load, to ensure that the car can be quickly stopped and the impact force can be minimized during emergency braking. Regular maintenance is essential during use. Maintenance personnel need to regularly check the wear of the brake wedge of the safety clamp. If the wear is serious, replace it in time to ensure the braking effect. At the same time, lubricate and debug the lifting mechanism to ensure that it can move sensitively and reliably at critical moments. In addition, it is necessary to evaluate the applicability of the instantaneous safety clamp in combination with the overall operation of the elevator. If it is found that the elevator system or cargo is adversely affected by the impact force problem, a more suitable safety device should be considered in time.

The instantaneous safety clamp occupies a unique position in the safety assurance system of the machine room cargo elevator. With its simple structure and rapid action, it can effectively ensure the safe operation of the elevator in specific low-speed and small-load application scenarios. However, due to the large impact force caused by instantaneous braking, it is necessary to carefully select in actual application, and to make the best use of its strengths and avoid its weaknesses through reasonable design and strict maintenance. Only in this way can the instantaneous safety clamp play a full role in the safety protection of the machine room freight elevator and ensure the safety and stability of the cargo transportation process.