Safety braking device for elevator

Abstract

The utility model discloses a safety braking device for an elevator, which relates to elevator equipment and comprises a mounting frame, a lifting frame and two groups of locking blocks, the mounting frame is fixedly connected around a traction sheave, the lifting frame is arranged on the mounting frame in a liftable manner, an infrared speed measuring device is arranged on the lifting frame, and the two groups of locking blocks are symmetrically arranged on two sides of the traction sheave. The locking block is arranged on the lifting frame and slidably connected to the mounting frame, the outer side of the locking block is of a first wedge-shaped structure, the inner side of the lifting frame is of a second wedge-shaped structure, and the inclined faces of the first wedge-shaped structure and the second wedge-shaped structure are parallel or coplanar. According to the utility model, the running speed of the elevator traction sheave can be timely and accurately detected. When it is detected that the traction wheel is overspeed, the lifting frame descends, the locking block moves towards the traction wheel and achieves locking through cooperation of the second wedge-shaped structure on the inner side of the lifting frame and the first wedge-shaped structure on the outer side of the locking block, and therefore the traction wheel is braked rapidly and effectively.

Description

Technical Field

[0001] This utility model relates to the field of elevator equipment technology, and in particular to a safety braking device for elevators. Background Technology

[0002] The brake is one of the most frequently used safety components in an elevator. It can stop the elevator motor from rotating when there is no power supply and effectively stop the car. The safe operation of an elevator is closely related to the working condition of the brake. Numerous accident cases show that one of the main causes of elevator personal injury accidents is brake failure or its own design defects, which can lead to phenomena such as the elevator overshooting, bottoming out, slipping, or even shearing.

[0003] Currently, common elevator safety braking devices on the market have some problems in practical applications. Most existing braking devices have relatively complex structures, which not only increases manufacturing and installation costs but may also increase the probability of malfunction due to the large number of parts. Moreover, some braking devices have slow braking response speeds, and when the elevator experiences abnormal situations such as overspeeding, they cannot brake in a timely and effective manner, posing significant safety hazards. Utility Model Content

[0004] The purpose of this utility model is to address the deficiencies in the existing technology by proposing a safety braking device for elevators.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An elevator safety braking device includes a mounting frame, a lifting frame, and locking blocks. The mounting frame is fixedly connected to the traction sheave. The lifting frame is liftably mounted on the mounting frame and located above the traction sheave. An infrared speed measuring device is installed on the lifting frame. The locking blocks are in two sets, symmetrically arranged on both sides of the traction sheave and slidably connected to the mounting frame. The outer side of the locking block has a first wedge-shaped structure, and the inner side of the lifting frame has a second wedge-shaped structure. The inclined surfaces of the first and second wedge-shaped structures are parallel or coplanar.

[0007] Furthermore, the mounting frame includes two longitudinal frames and one transverse frame. The transverse frame is integrally formed with the longitudinal frames and is located above the two longitudinal frames. The lifting frame is vertically mounted on the transverse frame. A slide block is fixedly connected to the bottom of the longitudinal frame. A slider is fixedly connected to the bottom of the locking block. The slider is slidably connected to the slide block.

[0008] Furthermore, a return spring is provided between the longitudinal frame and the slider.

[0009] Furthermore, a fixed base is fixedly connected to the bottom of the mounting frame, and the fixed base is fixedly connected to the bearing plate. The bearing plate is used to install the traction motor that drives the traction wheel.

[0010] Furthermore, the lifting frame has a threaded through hole, and a drive screw is threadedly connected inside the threaded through hole. The drive screw is rotatably connected to the mounting frame and is driven by a drive motor. The drive motor is signal-connected to the infrared speed measuring device. Guide rods are symmetrically arranged on both sides of the drive screw, and the mounting frame has through holes for the guide rods to pass through.

[0011] Furthermore, the end face of the locking block near the traction sheave is an arc surface, and the end face away from the traction sheave is an inclined surface. Beneficial effects

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention provides a safety braking device for elevators. The device features a liftable lifting frame mounted on a mounting frame, with an infrared speed measuring device installed on the lifting frame to accurately and promptly detect the speed of the elevator traction sheave. When overspeed is detected, the lifting frame descends, and the inner second wedge structure engages with the outer first wedge structure of the locking block, causing the locking block to move towards and lock the traction sheave, thus quickly and effectively braking it. This structural design not only improves braking response speed and braking effect stability but also simplifies the device's structure, reduces manufacturing costs and failure rate, and offers high practicality and safety. Attached Figure Description

[0014] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0015] Figure 1 This is a schematic diagram of the overall structure of a safety braking device for elevators.

[0016] Figure 2 This is a schematic diagram of the structure at the slider position.

[0017] In the diagram: 1. Guide rod; 2. Mounting frame; 3. Drive screw; 4. Lifting frame; 5. Locking block; 6. Traction wheel; 7. Slider; 8. Return spring; 9. Slide seat; 10. Infrared speed measuring device; 11. Fixed seat. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Reference Figures 1-2 An elevator safety braking device includes a mounting frame 2, a lifting frame 4, and locking blocks 5. The mounting frame 2 is fixedly connected to the traction sheave 6. The lifting frame 4 is vertically mounted on the mounting frame 2 and located above the traction sheave 6. An infrared speed measuring device 10 is installed on the lifting frame 4. The locking blocks 5 are in two sets, symmetrically arranged on both sides of the traction sheave 6, and slidably connected to the mounting frame 2. The outer side of the locking block 5 is a first wedge structure, and the inner side of the lifting frame 4 is a second wedge structure. The inclined surfaces of the first wedge structure and the second wedge structure are parallel or coplanar.

[0021] The infrared speed measuring device 10 installed on the lifting frame 4 can monitor the running speed of the traction sheave 6 in real time. When an overspeed anomaly is detected, the braking mechanism can be quickly triggered. This non-contact speed measuring method avoids wear and errors caused by mechanical contact, ensuring the accuracy and timeliness of speed detection, thereby achieving efficient and precise braking response and greatly reducing the safety hazards caused by elevator overspeed operation.

[0022] The mounting frame 2 is fixed around the traction sheave 6, and the lifting frame 4 is scissorably mounted on the mounting frame 2. Locking blocks 5 are symmetrically arranged and slidably connected to the mounting frame 2. This simple structural design reduces the number of parts. On the one hand, it reduces material costs and processing difficulty during manufacturing; on the other hand, it simplifies the installation process, improves installation efficiency, and reduces potential failure points caused by too many parts, thus improving the reliability of the device.

[0023] The inclined surfaces of the first wedge structure on the outer side of the locking block 5 and the second wedge structure on the inner side of the lifting frame 4 are parallel or coplanar. This wedge-shaped mating structure can convert the vertical movement of the lifting frame 4 into the horizontal movement of the locking block 5 when the lifting frame 4 descends, so that the two sets of locking blocks 5 move symmetrically to both sides of the traction wheel 6 and lock tightly.

[0024] In other preferred embodiments, the mounting frame 2 includes two longitudinal frames and one transverse frame. The transverse frame is integrally formed with the longitudinal frames and is located above the two longitudinal frames. The lifting frame 4 is vertically mounted on the transverse frame. A slide block 9 is fixedly connected to the bottom of the longitudinal frame. A slider 7 is fixedly connected to the bottom of the locking block 5. The slider 7 is slidably connected to the slide block 9.

[0025] Mounting frame 2 adopts a design with two longitudinal frames and one transverse frame integrally formed. This integrated structure greatly improves the overall strength and stability of the frame, and can be firmly fixed around the traction sheave 6, providing reliable support for the entire braking device. The layout of the transverse frame above the two longitudinal frames makes reasonable use of space, allowing the lifting frame 4 to be stably set on the transverse frame. Furthermore, the structural design of mounting frame 2 facilitates docking and installation with other elevator components, improving the convenience and efficiency of installation.

[0026] Specifically, a return spring 8 is installed between the longitudinal frame and the slider 7. This return spring 8 provides reliable reset power after the braking device completes its braking action. When the elevator returns to normal and the lifting frame 4 rises to release the brake, the tension of the return spring 8 will cause the slider 7 to move along the slide block 9 away from the traction sheave 6, automatically resetting the locking block 5 to its initial position. This automatic reset function requires no manual intervention, greatly improving the ease of use of the device.

[0027] In other preferred embodiments, a fixed base 11 is fixedly connected to the bottom of the mounting frame 2, and the fixed base 11 is fixedly connected to the support plate. The support plate is used to install the traction motor that drives the traction wheel 6.

[0028] In other preferred embodiments, the lifting frame 4 has a threaded through hole, and a drive screw 3 is threadedly connected to the threaded through hole. The drive screw 3 is rotatably connected to the mounting frame 2. The drive screw 3 is driven by a drive motor (the drive motor can be located inside the lifting frame, which is omitted in the figure). The drive motor is signal-connected to the infrared speed measuring device 10. Guide rods 1 are symmetrically arranged on both sides of the drive screw 3, and the mounting frame 2 has through holes for the guide rods 1 to pass through. Preferably, the drive motor can be fixedly connected inside the lifting frame, and the output end of the drive motor is connected to the rotating part of the drive screw through a gear.

[0029] The threaded through hole on the lifting frame 4 forms a threaded transmission structure with the drive screw 3. This design can accurately convert the rotational motion of the drive screw 3 into the vertical lifting motion of the lifting frame 4. The threaded transmission has the characteristics of stable transmission ratio and high positioning accuracy, enabling the lifting frame 4 to move precisely at a set speed and stroke, ensuring that the timing and force of the engagement between the locking block 5 and the traction sheave 6 during braking are precisely controllable. The drive motor is controlled by the infrared speed measuring device 10. When the speed measuring device detects that the traction sheave 6 is overspeeding, it can drive the motor to rotate the screw in real time, realizing the rapid response of the lifting frame 4. The guide rods 1 symmetrically arranged on both sides of the drive screw 3 cooperate with the through holes of the mounting frame 2, providing double guidance and support for the lifting motion of the lifting frame 4.

[0030] In other preferred embodiments, the end face of the locking block 5 near the traction wheel 6 is an arc surface, and the end face away from the traction wheel 6 is an inclined surface.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A safety braking device for elevators, characterized in that, The device includes a mounting frame, a lifting frame, and locking blocks. The mounting frame is fixedly connected around the traction sheave. The lifting frame is liftable and mounted on the mounting frame, located above the traction sheave. An infrared speed measuring device is installed on the lifting frame. There are two sets of locking blocks, symmetrically arranged on both sides of the traction sheave and slidably connected to the mounting frame. The outer side of the locking block has a first wedge-shaped structure, and the inner side of the lifting frame has a second wedge-shaped structure. The inclined surfaces of the first and second wedge-shaped structures are parallel or coplanar.

2. A safety brake device for an elevator according to claim 1, characterized in that The mounting frame includes two longitudinal frames and one transverse frame. The transverse frame is integrally formed with the longitudinal frames and is located above the two longitudinal frames. The lifting frame is mounted on the transverse frame in a liftable manner. A slide block is fixedly connected to the bottom of the longitudinal frame. A slider is fixedly connected to the bottom of the locking block. The slider is slidably connected to the slide block.

3. A safety brake device for an elevator according to claim 2, characterized in that A return spring is provided between the longitudinal frame and the slider.

4. A safety brake device for an elevator according to claim 1, characterized in that The mounting frame is fixedly connected to a base at its bottom, and the base is fixedly connected to a support plate. The support plate is used to mount the traction motor that drives the traction wheel.

5. A safety brake device for an elevator according to claim 1, wherein The lifting frame has a threaded through hole, and a drive screw is threaded into the threaded through hole. The drive screw is rotatably connected to the mounting frame and is driven by a drive motor. The drive motor is connected to the infrared speed measuring device. Guide rods are symmetrically arranged on both sides of the drive screw, and the mounting frame has through holes for the guide rods to pass through.

6. A safety brake device for an elevator according to claim 1, characterized in that The end face of the locking block near the traction sheave is an arc surface, and the end face away from the traction sheave is an inclined surface.

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