Electronic safety tongs
By using an electromagnetic in the elevator safety pliers to link the elastic pin structure and contact switch of the moving wedge block, the design of the elevator safety pliers is simplified, the problems of complex structure and high installation difficulty in the existing technology are solved, and the compactness is achieved and improve safety.
Patent Information
- Application Number
- CN202420224072.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-01-30
AI Technical Summary
The existing elevator safety clamps have complex structures, large space occupancy, and are difficult to install and maintain, which cannot meet the requirements of safety improvement and space saving.
The elastic pin structure between the electromagnet and the moving wedge is adopted to reduce tensioning device and lifting mechanism, and the linkage between the contact switch and the moving wedge increases safety, simplifies the structure, and reduces the difficulty of installation and maintenance.
The structure of the safety clamp is compact, reducing the difficulty of shaft layout and maintenance workload, and improving safety, meeting the requirements of elevators for safety and space saving.
Smart Images
Figure CN222331267U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of elevator safety, in particular to an electronic safety clamp. Background Art
[0002] The safety clamp is the most important safety component in the elevator. In order to prevent the elevator from stalling and causing accidents such as hitting the top or bottom, and to ensure the personal safety of passengers, the elevator must be equipped with a safety clamp. When the elevator is running at an overspeed, the safety clamp will use the friction brake on the guide rail to stop the elevator.
[0003] Currently, most safety clamps work in a multi-component mechanical combination mode. The overspeed protection system consists of a speed limiter, a safety clamp body, a tensioning device, a lifting mechanism, and a wire rope. The speed limiter monitors the speed, and the wire rope drive provides the force required to lift the safety clamp. It is necessary to regularly check and adjust the synchronization of the safety clamps on both sides of the car. Its structure is relatively complex, the entire device is relatively large, involving many components, the hoistway layout is difficult, the adaptability is weak, and the workload of later debugging and maintenance is large.
[0004] The prior art also discloses an electronic safety clamp for an elevator, comprising a car, a safety clamp, a lifting rod, a lifting arm, a linkage rod, a driving motor, a tensioning component, a controller and an encoder; the linkage rod is fixed to the top surface of the car through a bearing seat, a synchronous wheel is provided at the edge of one end of the linkage rod, the synchronous wheel is connected to the driving wheel through a synchronous belt, the synchronous wheel is connected to the output shaft of the driving motor, the driving motor is fixed on a support, the support is connected to the tensioning component, a torsion spring is provided on the linkage rod outside the synchronous wheel, the end of the linkage rod is movably connected to one end of the lifting arm, the other end of the lifting arm is movably connected to the top end of the lifting rod, a reset spring is provided on the lifting rod, the bottom end of the lifting rod is fixedly connected to the safety clamp, and the encoder is arranged at the top edge of the car through a support.
[0005] The operation of the electronic safety clamp of the above structure still requires the use of components such as a lifting rod, a lifting arm, a linkage rod, a drive motor, and a tensioning component. This is close to a conventional safety clamp. Although it is driven electronically, the structure is still complex and will take up too much space, which cannot meet the installation requirements of existing elevators for improving safety factors and saving space. Utility Model Content
[0006] The utility model aims to provide an electronic safety clamp, which makes the safety clamp simple in structure, safe and compact, and reduces the difficulty of well arrangement.
[0007] In order to solve the above technical problems, the implementation method of the utility model provides a technical solution as follows:
[0008] An electronic safety clamp comprises a base and a support member movably connected to the base, wherein an electromagnet and a fixed wedge block are fixedly arranged on the base, a moving wedge block is arranged corresponding to the fixed wedge block, the moving wedge block is axially slidably connected to the support member, and a gap for accommodating an elevator guide rail is provided between the fixed wedge block and the moving wedge block;
[0009] An elastic push rod is provided between the electromagnet and the support member. When the electromagnet is energized, the elastic push rod is magnetically attracted by the electromagnet and is in an elastically compressed state. When the electromagnet is de-energized, the elastic push rod is elastically released, pushing the support member to move toward the fixed wedge block, driving the moving wedge block to move toward the fixed wedge block, the moving wedge block contacts the elevator guide rail, and slides upward along the support member. The distance between the moving wedge block and the fixed wedge block is reduced, clamping the elevator slide rail, and braking the elevator by the friction between the moving wedge block, the fixed wedge block and the guide rail.
[0010] Furthermore, the base is fixed with a contact switch, and the contact switch is connected to the moving wedge block through a cam assembly. When the moving wedge block moves upward, it drives the cam assembly to squeeze the contact switch to break the circuit. When the moving wedge block moves downward to the bottom of the support member, the contact switch resets and closes the circuit.
[0011] Furthermore, the cam assembly includes a cam and a connecting plate fixedly connected to the cam, the cam is rotatably connected to the base, a reset groove is provided on the edge of the cam, and a flange is provided adjacent to the reset groove. The cam is rotated so that the reset groove and the contact switch face each other to reset the closed circuit, and the cam is rotated so that the flange squeezes the contact switch to open the circuit.
[0012] Furthermore, an oblong connecting groove is provided at one end of the connecting plate away from the cam, and the connecting plate is movably connected to the movable wedge block via a connecting shaft passing through the connecting groove.
[0013] Furthermore, an arc-shaped positioning groove is provided on the cam, and the cam is fixedly connected to the connecting plate through a fastener passing through the positioning groove.
[0014] Furthermore, when the elevator exceeds the speed limit while descending, the speed monitoring system gives a power-off signal, triggering the electromagnet to cut off power.
[0015] Furthermore, in the maintenance state, the elevator is operated to move upward, the moving wedge is separated from the elevator guide rail, slides down along the support member to the bottom of the support member, and drives the cam to rotate clockwise so that the reset groove is aligned with the contact switch.
[0016] Furthermore, when the cam rotates clockwise so that the reset groove and the contact switch are directly opposite to the reset closed circuit, the speed monitoring system gives a power-on signal, and the electromagnet is energized to magnetically adsorb the elastic push rod.
[0017] Compared with the prior art, the electronic safety clamp provided by the utility model optimizes the safety structure of the speed limiter, the safety clamp, the tensioning device, the lifting mechanism and the wire rope. By arranging an elastic push rod between the electromagnet and the moving wedge block, the arrangement of components such as the tensioning device, the lifting mechanism and the wire rope is reduced, so that the number of components of the safety clamp is reduced, the structure is compact, the transmission is stable, and it is more conducive to the arrangement of the safety clamp in the hoistway; at the same time, through the linkage arrangement of the contact switch and the moving wedge block, the safety of the safety clamp is further increased, and the difficulty of installation and commissioning as well as the maintenance workload are reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.
[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the electronic safety clamp in the embodiment of the utility model;
[0020] Figure 2 This is a schematic diagram of the front structure of the electronic safety clamp in the embodiment of the utility model;
[0021] Figure 3 This is a schematic diagram of the reverse structure of the electronic safety clamp in the embodiment of the utility model;
[0022] Figure 4 It is a schematic diagram of the combined structure of the support member and the moving wedge block in the embodiment of the utility model.
[0023] Explanation of the reference numerals: 1. base; 2. electromagnet; 3. elastic push rod; 4. support member; 5. moving wedge; 59. connecting shaft; 6. fixed wedge; 7', cam assembly; 7. cam; 71. fixing groove; 72. reset groove; 73. flange; 8. contact switch; 81. induction head; 9. connecting plate; 91. connecting groove. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.
[0025] like Figure 1-4The utility model provides an electronic safety clamp, comprising a base 1, and a support member 4 movably connected to the base 1, an electromagnet 2 and a fixed wedge block 6 are fixedly arranged on the base 1, a moving wedge block 5 is arranged corresponding to the fixed wedge block 6, the moving wedge block 5 is axially slidably connected to the support member 4, a gap for accommodating the elevator guide rail is arranged between the fixed wedge block 6 and the moving wedge block 5; an elastic push rod 3 is arranged between the electromagnet 2 and the support member 4, and when the electromagnet 2 is powered on, the elastic push rod 3 is magnetically attracted by the electromagnet 2 and is in an elastic state. In the compressed state, when the electromagnet 2 is powered off and demagnetized, the elastic push rod 3 is elastically released, pushing the support member 4 to move toward the fixed wedge block 6, driving the moving wedge block 5 to move toward the fixed wedge block 6, and the moving wedge block 5 contacts the elevator guide rail. Under the action of friction, the moving wedge block 5 slides upward along the support member 4, and the distance between the moving wedge block 5 and the fixed wedge block 6 gradually decreases, and the clamping force on the elevator slide rail gradually increases. The elevator is braked by the friction between the moving wedge block 5 and the fixed wedge block 6 and the guide rail to stop the downward overspeeding elevator.
[0026] In one embodiment, the base 1 is fixedly provided with a contact switch 8, and the contact switch 8 is connected to the moving wedge block 5 through a cam assembly 7'. When the moving wedge block 5 moves upward, it drives the cam assembly 7' to squeeze the contact switch 8 to break the circuit. When the moving wedge block 5 moves downward to the bottom of the support member 4, the contact switch 8 resets and closes the circuit. The contact switch 8 is provided with an elastically compressible sensing head 81. The cam assembly 7' includes a cam 7 and a connecting plate 9 fixedly connected to the cam 7. The cam 7 and the sensing head 81 are arranged correspondingly. The cam 7 is rotatably connected to the base 1. A reset groove 72 and a flange 73 are provided on the edge of the cam 7. As the cam 7 rotates, the flange 73 can squeeze the sensing head 81 to put the contact switch 8 in an off state, or make the reset groove 72 face the sensing head 81 to reset the contact switch 8 to close the circuit. One end of the connecting plate 9 is movably connected to the moving wedge block 5, and the other end is fixedly connected to the cam 7. When the moving wedge block 5 moves upward, it drives the cam 7 to rotate counterclockwise, so that the flange 73 squeezes the contact switch 8; when the moving wedge block 5 moves downward and resets to the bottom of the support member 4, the moving wedge block 5 separates from the guide rail and slides down, driving the cam 7 to rotate clockwise, so that the reset groove 72 is opposite to the contact switch 8, and the contact switch 8 is reset to close the circuit.
[0027] In one embodiment, the cam 7 is provided with an arc-shaped fixing groove 71, and a fastener is used to pass through the arc-shaped positioning groove and fixedly connected to one end of the connecting plate 9. The arc-shaped positioning groove is used to adjust the position of the reset groove 72 and the contact switch 8 during installation to prevent the relative position difference. The end of the connecting plate 9 connected to the moving wedge block 5 is provided with a connecting groove 91, and the connecting groove 91 is an oblong hole. One end of the moving wedge block 5 is movably connected to the connecting plate 9 through a connecting shaft 59, and the connecting shaft 59 is inserted into the connecting groove 91. There is a gap between the connecting shaft 59 and the connecting groove 91. As the moving wedge block 5 moves linearly, the connecting shaft 59 moves along the connecting groove 91, thereby driving the cam 7 to rotate.
[0028] When the elevator exceeds the speed limit when descending, the speed monitoring system gives a power-off signal, and the electromagnet 2 triggers the power-off. Under the rebound force, the elastic push rod 3 pushes the support member 4 horizontally toward the fixed wedge block 6, so that the moving wedge block 5 contacts the guide rail. Under the friction between the moving wedge block 5 and the guide rail, the moving wedge block 5 moves upward along the support member 4, and the distance between the moving wedge block 5 and the fixed wedge block 6 is reduced, so that the guide rail is clamped. The elevator is braked by the friction between the moving wedge block 5 and the fixed wedge block 6 and the guide rail. As the moving wedge block 5 rises, it drives the cam 7 to rotate counterclockwise, the flange 73 squeezes the induction head 81, the contact switch 8 is disconnected, and the elevator is in a circuit-breaking state. In maintenance mode, the staff short-circuits the power circuit and operates the elevator upward. The moving wedge 5 disengages from the guide rail and slides down to the bottom of the support 4, driving the cam 7 to rotate clockwise, so that the reset groove 72 corresponds to the induction head 81, the contact switch 8 is closed, and the speed monitoring system gives a power-on signal. The electromagnet 2 is energized to adsorb and compress the elastic push rod 3, so that the moving wedge 5 remains detached from the guide rail, and the elevator resumes normal operation.
[0029] The utility model provides an electronic safety clamp, which optimizes the safety structure of the speed limiter, the safety clamp, the tensioning device, the lifting mechanism and the wire rope. By arranging an elastic push rod between the electromagnet and the moving wedge block, the arrangement of components such as the tensioning device, the lifting mechanism and the wire rope is reduced, so that the number of components of the safety clamp is reduced, the structure is compact, the transmission is stable, and it is more conducive to the arrangement of the safety clamp in the hoistway; at the same time, through the linkage arrangement of the contact switch and the moving wedge block, the safety of the safety clamp is further increased, and the difficulty of installation and commissioning as well as the maintenance workload are reduced.
[0030] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.
Claims
1. An electronic safety clamp, characterized in that: The invention comprises a base (1) and a support member (4) movably connected to the base (1); an electromagnet (2) and a fixed wedge block (6) are fixedly arranged on the base (1); a moving wedge block (5) is arranged corresponding to the fixed wedge block (6); the moving wedge block (5) is axially slidably connected to the support member (4); and a gap for accommodating an elevator guide rail is provided between the fixed wedge block (6) and the moving wedge block (5); An elastic push rod (3) is provided between the electromagnet (2) and the support member (4). When the electromagnet (2) is powered on, the elastic push rod (3) is magnetically attracted by the electromagnet (2) and is in an elastically compressed state. When the electromagnet (2) is powered off, the elastic push rod (3) is elastically released, pushing the support member (4) to move toward the fixed wedge block (6), driving the moving wedge block (5) to move toward the fixed wedge block (6), the moving wedge block (5) contacts the elevator guide rail, and slides upward along the support member (4), the distance between the moving wedge block (5) and the fixed wedge block (6) is reduced, the elevator slide rail is clamped, and the elevator is braked by the friction between the moving wedge block (5) and the fixed wedge block (6) and the guide rail.
2. An electronic safety clamp according to claim 1, characterized in that: The base (1) is fixedly provided with a contact switch (8), and the contact switch (8) is connected to the moving wedge block (5) via a cam assembly (7'). When the moving wedge block (5) moves upward, the cam assembly (7') is driven to press the contact switch (8) to open the circuit. When the moving wedge block (5) moves downward to the bottom of the support member (4), the contact switch (8) is reset to close the circuit.
3. An electronic safety clamp according to claim 2, characterized in that: The cam assembly (7') comprises a cam (7) and a connecting plate (9) fixedly connected to the cam (7); the cam (7) is rotatably connected to the base (1); a reset groove (72) is provided on the edge of the cam (7); a flange (73) is provided adjacent to the reset groove; the cam (7) is rotated so that the reset groove (72) and the contact switch (8) face each other to reset the closed circuit; and the cam (7) is rotated so that the flange (73) presses the contact switch (8) to open the circuit.
4. An electronic safety clamp according to claim 3, characterized in that: An oblong connecting groove (91) is provided at one end of the connecting plate (9) away from the cam (7), and the connecting plate (9) is movably connected to the movable wedge block (5) via a connecting shaft (59) passing through the connecting groove (91).
5. An electronic safety clamp according to claim 3, characterized in that: The cam (7) is provided with an arc-shaped positioning groove, and the cam (7) is fixedly connected to the connecting plate (9) via a fastener passing through the positioning groove.
6. An electronic safety clamp according to claim 1, characterized in that: When the elevator exceeds the speed limit when descending, the speed monitoring system gives a power-off signal, triggering the electromagnet (2) to cut off the power.
7. An electronic safety clamp according to claim 3, characterized in that: In the maintenance mode, the elevator is operated to move upward, the moving wedge (5) is separated from the elevator guide rail, slides down along the support member (4) to the bottom of the support member (4), and drives the cam (7) to rotate clockwise so that the reset groove (72) is aligned with the contact switch (8).
8. An electronic safety clamp according to claim 7, characterized in that: When the cam (7) rotates clockwise so that the reset groove (72) and the contact switch (8) are aligned with each other to reset the closed circuit, the speed monitoring system gives a power-on signal, and the electromagnet (2) is energized to magnetically adsorb the elastic push rod (3).