The Benefits of an Elevator Buffer
An elevator buffer device is a device that prevents an elevator from falling. It is composed of two parallel springs 45 and a buffer member 47 that is fixed to the lower end of the parallel springs. The buffer member strikes two strike bases 48 which are arranged in a symmetric pattern on the hydraulic buffer 10.
Hydraulic buffer 10
A hydraulic elevator buffer is designed to minimize the deceleration of an elevator. These buffers keep the average deceleration under one g and cannot exceed 2.5g for more than 40 milliseconds. These buffers meet all requirements of the elevator code. Here are some tips to choosing the right one for your needs. And don’t forget to check the spec sheet to ensure the safety of your elevator. The following is a review of some of the main benefits of hydraulic elevator buffers.
A conventional hydraulic elevator buffer uses a high-strength material to withstand the weight of the car 6 and hydraulic pressure from plunger 13. However, the impact of the car 6 can cause noise and shock to the traveling body. This can cause discomfort to passengers. Therefore, a hydraulic elevator buffer is a necessity for safe transportation. The hydraulic elevator buffer 10 includes a spring-loaded auxiliary buffer 22. The auxiliary buffer reduces shock and noise.
A hydraulic elevator buffer meets all the requirements of the elevator code. This buffer consists of a base that is attached to the elevator, an oil-filled cylinder that is connected to the elevator, and a cylindrical plunger capable of reciprocating in the axial direction. The cylinder’s upper end is fixed, and a flange and spring bracket fix the plunger in place. This hydraulic elevator buffer 10 meets the requirements of the elevator code.
Mechanical spring-return type oil buffer 22
The mechanical spring-return type oil buffer 22 has a series of springs mounted to it. A piston-type hydraulic spring 28 and a mechanical friction or ring spring 30 support the buffer and engage with each other when the car impacts them. The impact compresses both springs, thereby holding the buffer extended. However, when the car impacts the buffer, the leaf spring is compressed. Therefore, it is necessary to adjust the spring constants to reduce the noise and shock that the buffer would cause.
A mechanical spring-return type oil buffer 22 includes a hat-shaped support portion 60 that is mounted on a spring bracket 15. The hat-shaped support portion extends beyond the flange 14 and supports the lower end of the coil-spring. The upper end of the spring-return-type spring is placed over the end of the plunger. A return spring, on the other hand, pushes the plunger outward in the direction opposite to the direction of travel.
This auxiliary buffer has a cylinder and a piston rod that are connected to each other. Piston rod 124 extends from the support bearing on front head 112, and a support plate 126 is attached to the upper end of the buffer member. The piston rod carries a piston that slides within the cylinder. The return flow aperture is open when the piston is in the fully collapsed position. This opens the return flow aperture 70, which allows oil to enter the chamber 48 during the initial expansion.
Non-linear spring 41
A non-linear spring 41 for an elevator buffer reduces shock and noise from an impact by increasing the pit depth and displacing a plunger. The leaf spring 41 exhibits a small spring constant after impact but increases as the car decelerates. This mechanism allows the plunger to move downward so that the car 6 can impact the buffer member. The present invention overcomes these problems and also eliminates noise and shock.
The spring used in an elevator buffer is a kind of energy-storing device. It is made from special polyurethane material. It is usually used at one mph. In addition, it is important to check the oil level of the buffer every six months. The spring’s stroke distance cannot be less than 65 mm. However, it is possible to install buffers in a variety of structures. If you’re looking for an elevator buffer, you should check the European standards and make sure it is made with the highest quality materials.
A non-linear leaf spring is also available for an elevator buffer. These springs can be made by stacking several leaf springs with different curvatures. The higher the number of the leaf springs, the higher the stiffness of the spring. It also helps to eliminate noise and shock. If your elevator uses non-linear springs, you can get them by modifying the pitch of the inter-wires.
Parallel spring 45
A hydraulic buffer device is a hydraulic system that reduces shock and noise generated during elevator operations. The mechanism comprises a hydraulically operated plunger 13 and a counterweight 7. The lower part of the car 6 impacts the buffer member 17 and deforms leaf spring 41. Rollers 42 move in a right-to-left direction and roll on the bottom surface of the car. The springs are designed to maintain a tension between them and the counterweight and are connected to the elevator’s hydraulic system.
FIG. 6 illustrates the front view of a buffer device for elevators. The midpoint portion of the cylinder 12 has a fixed spring bracket 44. A parallel spring 45 surrounds a part of the hydraulic buffer 10, and is arranged in parallel to the cylinder. The springs are positioned in a series, with the upper end portion of the spring located higher than the lower end. In addition, the stiffness of the springs is set below that of the buffer member 17.
The auxiliary buffer 22 includes a cylinder 23 and a piston rod 24. The piston is fixed on the tip portion of the piston rod 24 and is made to slide within the cylinder 23. A supporting plate 26 is attached to the base end portion of the piston rod 24 and is coupled to the upper end portion of the buffer member 21. Finally, a free piston 27 is arranged within the cylinder 23. These components are designed to prevent the elevator from moving too far.
Leaf spring 51
According to a ninth embodiment of the present invention, a buffer device for an elevator is provided. The buffer device includes a series spring 51 mounted on a spring bracket 15 and arranged in series with the hydraulic buffer 10. The spring 51 has a lower stiffness than the buffer member 17, which reduces the shock and pit depth during an elevator ride. The series spring 51 is mounted on the spring bracket 15 and extends downwardly to engage the elevator car 6.
A typical elevator buffer device includes a coil spring and a return spring. The coil spring extends beyond the plunger when there is no load on it. The traveling body compresses the coil spring by a distance DS. Therefore, Kc is greater than KrxDS/DH. The present invention resolves these problems and provides a buffer device that reduces noise and shock during an elevator ride. The invention also provides a spring for an elevator, and is described in detail below.
In the proposed design procedure, the leaf spring is designed so that its stiffness does not exceed the elastic region. When a car 6 strikes the hydraulic buffer 10, the counterweight 7 impacts the hydraulic buffer. The spring then decompresses and moves downward. This causes the hydraulic buffer to engage in a braking mechanism. The elevator car can decelerate safely, thereby preventing damage to the hydraulic buffer 10.
Effects of compression on the height of the hydraulic buffer 10
During normal operation, the height of the hydraulic elevator buffer 10 can be compressed partially at the lowest floor. This means that the car 6 cannot directly contact the buffer member 17. In addition, the coil spring 61 is set to a stiffness that allows the hydraulic elevator buffer 10 to be compressed. The space between the car 6 and the hydraulic elevator buffer 10 helps reduce noise and vibration. After installation of the buffer device, the hydraulic elevator can be operated normally.
A fifth embodiment of the present invention provides a buffer device for an elevator. A buffer member 47 is fixed to the lower end of two parallel springs 45. Each spring strikes two strike bases 48, which are arranged in a symmetrical pattern on the hydraulic elevator buffer 10.
In addition to the compression force, the hydraulic elevator buffer must also resist the impact of deceleration and exert a constant retardation force throughout its stroke. This force is necessary to maintain the height of the elevator. The buffers should also be tested for their compliance with the code and specifications. This article will review some of the important requirements for elevator buffers and provide a brief explanation. Further, the article will outline how the different types of hydraulic elevator buffers work.
Effects of deformation of the buffer member 47
A car 6 may have a small impact force on the elevator buffer member 47. When a car strikes the buffer member, its lower portion is elastically deformed and the plunger 13 moves downward. The spring bracket 46 and series spring 51 push the car down, thereby reducing the impact energy. This effect allows the car to decelerate and impact the counterweight safely. The deformation forces on the elevator buffer member 47 reduce the noise and shock produced by an impact.
The impact force is applied to the steel ring holding the buffer to the bottom plate. It has the nominal steel material parameters. The applied force is modeled as an excitation force into a Finite Element model. The resulting time-history of the stress in the buffer is then fine-tuned to obtain the most accurate predictions. The resulting deformation forces are compared to experimental measurements obtained from high-speed camera images.
The freefall distance and the length of the buffer are essential for achieving 115% of the elevator’s rated speed. The freefall distance is the primary determining factor in determining the overall height of an elevator buffer. Usually, elevator buffers do not deviate from this minimum stroke requirement. Therefore, the design engineer must consider the stroke requirements when calculating the overall height of an elevator buffer. Alternatively, a telescopic buffer requires an overall height that is double or even triple the minimum stroke. This additional height is needed to restrain lateral movement after fully extended.