Safety tongs for lifting system of elevator

Abstract

According to the safety tongs for the lifting system for the elevator in the field of elevator braking devices, in the process from overspeed out-of-control to braking completion of the elevator, a movable wedge block firstly makes contact with a movable part, a second compression spring is pushed to be compressed and make soft contact, braking of an elevator car is buffered for the first time, and then the movable wedge block makes contact with an impact pile; according to the elevator car braking device, a plurality of breaking grooves are formed in an impact pile, the impact pile is broken in the direction of the breaking grooves in sequence from bottom to top till a movable wedge block makes contact with a connecting cylinder, and multiple times of energy release is conducted in a short time. And compared with single-time impact in the traditional elevator car braking process, soft contact between the impact pile and a second compression spring is utilized firstly; impact generated by braking of the elevator car is buffered for the first time, then impact generated by braking of the elevator car is buffered for multiple times through layer-by-layer fracture of the impact piles, the single-time impact strength is greatly reduced, damage to elevator passengers is reduced, and the safety of elevator braking is improved.

Description

Technical Field

[0001] The safety tongs involved in the present invention, in particular, relate to a safety tongs for an elevator lifting system applied to the field of elevator braking devices. Background Art

[0002] The elevator safety tongs are one of the most important mechanical safety protection devices for elevators. Its core function is to forcibly stop the car (or counterweight) on the guide rail when the elevator runs at an excessive speed or falls out of control, preventing catastrophic accidents. When the running speed of the elevator exceeds a certain set value of the rated speed, the speed limiter starts and drives the lifting structure to start, so that a pair of wedges form a self-locking with the guide rail, realizing the self-locking operation of the elevator car.

[0003] The specification of the invention patent CN201811222396.9 discloses an elevator safety tongs. By setting an electromagnet, a moving wedge, a guide roller, a brake block and anti-slip teeth, when the elevator gets out of control, the brake block clamps the guide rail, thereby slowing down the elevator speed and improving the safety effect. And the contact surface between the brake block and the guide rail is provided with grid-shaped anti-slip teeth, which has a good anti-slip effect and is beneficial to improving the braking effect of the elevator safety tongs. The specification of the invention patent CN201410309861.8 discloses a pneumatic elevator and a clamping method of a pneumatic elevator safety tongs. Its safety tongs are not affected by power failure of the elevator, elevator faults, etc. When the air pressure difference above and below the elevator car appears abnormally, the sealing cover moves down, presses the roller, and the safety tongs clamp the car guide rail, and the elevator car stops running without falling rapidly, eliminating potential safety hazards and ensuring the safety of passengers.

[0004] As the braking mechanism of the elevator car, the safety tongs can perform emergency braking on the elevator car when it falls, making it difficult for the elevator car to fall at a high speed and increasing the safety of the passengers. However, during the actual braking process of the elevator car, accidents may occur where people are injured due to the impact caused by the too-fast braking of the elevator car. Summary of the Invention

[0005] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is that during the actual braking process of the elevator car, accidents may occur where people are injured due to the impact caused by the too-fast braking of the elevator car.

[0006] To solve the above problems, the present invention provides a safety tong for an elevator lifting system, which includes a safety tong base and a lifting unit. A pair of fixed wedges are fixedly connected inside the safety tong base. A pair of mutually matching movable wedges are arranged between the two fixed wedges. Fixed pins are inserted into both of the two movable wedges. The lifting unit includes a lifting block, and a limiting column matching the two fixed pins is drilled on the lifting block. Both of the two fixed pins penetrate through the sliding holes and extend to the side of the sliding holes away from the movable wedges. A lifting rod is fixedly connected to the upper end of the sliding hole. The end of the lifting rod away from the sliding hole penetrates through the safety tong base and extends to the upper side of the safety tong base. A connecting block is fixedly connected to the upper side of the lifting rod;

[0007] A pair of protection modules respectively matching the positions of the two movable wedges are fixedly connected to the upper inner wall of the safety tong base. The protection module includes a connecting cylinder. A plurality of ventilation holes are drilled on the side wall of the upper end of the connecting cylinder. An activity part is slidably connected inside the connecting cylinder. One end of the activity part penetrates through the lower end of the connecting cylinder and extends to the lower side of the connecting cylinder. A second compression spring is fixedly connected between the activity part and the connecting cylinder. A plurality of impact piles are fixedly connected to the lower end of the connecting cylinder. All of the plurality of impact piles are closely attached to the activity part. A plurality of fracture grooves are drilled on the inner walls of all of the plurality of impact piles. The depths of the plurality of fracture grooves become shallower as the distance from the connecting cylinder decreases.

[0008] In the above safety tong for an elevator lifting system, firstly, by using the multiple buffering effects of the second compression spring and the impact piles, the single impact intensity is greatly reduced, the harm to elevator passengers is reduced, and the safety of elevator braking is increased.

[0009] As a further improvement of the present application, a U-shaped spring plate is sleeved outside the two fixed wedges. Fixed threaded columns are fixedly connected to the two side walls of the U-shaped spring plate away from the fixed wedges. The ends of the two fixed threaded columns away from the U-shaped spring plate penetrate through the side walls of the safety tong base. Locking nuts are threadedly connected to both of the two fixed threaded columns, and the locking nuts are in contact with the side walls of the safety tong base. The U-shaped spring plate is used to achieve shock absorption during the working process of the fixed wedges and the movable wedges, and the stability of the safety tong during operation is increased.

[0010] As a further improvement of the present application, a threaded head is fixedly connected to the upper end of the connecting cylinder. The protection module is fixedly connected to the safety tong base through the threaded head. The overall quick installation and quick disassembly of the protection module are realized through threaded connection, which is convenient for maintenance personnel to replace the protection module that has become ineffective in time.

[0011] As a further improvement of the present application, the structural strength of the movable part and the connecting cylinder is the same, and the structural strength of the movable part and the connecting cylinder is greater than that of the impact pile, and the structural strength of the movable part and the connecting cylinder is less than that of the threaded head. On the one hand, when the impact pile still exists, the movable part and the impact pile are not easily directly deformed under the action of external force, and it is not easy to cause the failure of the protection module. After the impact pile is completely broken, the movable wedge continues to apply pressure, which will preferentially cause the complete deformation of the movable part and the connecting cylinder, and the threaded head is easy to maintain its structural integrity, facilitating subsequent replacement work.

[0012] As another improvement of the present application, a first compression spring is fixedly connected between the two fixing pins. The first compression spring is located in the sliding hole. When there is no external force acting on the movable wedge, the two movable wedges are separated from each other, and it is not easy to have excessive wear between the two movable wedges and the guide rail during the operation of the elevator, and it is not easy to affect the subsequent braking work of the elevator car.

[0013] As a supplement to another improvement of the present application, a limiting column is inserted into the first compression spring. The limiting columns respectively penetrate through the two fixing pins and are fixedly connected to the inner wall of the sliding hole. The existence of the limiting column can, on the one hand, limit the sliding of the two movable wedges and the fixing pins, reducing the impact on the subsequent self-locking of the safety tongs. On the other hand, the limiting column can prevent the first compression spring from deforming in a non-working direction, reducing the possibility of the first compression spring failing due to non-working deformation.

[0014] As another improvement of the present application, a safety module is sleeved outside the connecting cylinder. The safety module is integrally made of an elastic material. The safety module includes a corrugated pipe. A disassembly groove is drilled at the upper end of the corrugated pipe. A buffer net is fixedly connected to the upper inner wall of the corrugated pipe. A counterweight ring is fixedly connected to the lower end of the buffer net. The existence of the safety module and the buffer net can capture the broken part of the impact pile, which is convenient for subsequent recovery work on the one hand, and can also prevent the broken part of the flying impact pile from damaging other components on the other hand.

[0015] As a supplement to another improvement of the present application, the buffer net is woven from a high-toughness material. The area of the woven mesh holes of the buffer net is 0.9 times the cross-sectional area of the impact pile, making it easy for the buffer net to capture the broken part of the flying impact pile and facilitating subsequent unified recovery.

[0016] As a supplement to another improvement of the present application, the outer wall of the connection part between the connecting cylinder and the safety module is a matte surface, and there is an interference fit between the connecting cylinder and the corrugated pipe, increasing the connection strength between the protection module and the safety module, making it not easy for the safety module and the buffer net to fall off. At the same time, the drilling of the disassembly groove facilitates the removal of the interference-fitted safety module from the protection module.

[0017] In summary, when the elevator runs at an excessive speed or falls out of control, during the process that the movable wedge block is pulled upward and not completely locked, it will come into contact with the movable part and push the second compression spring to compress, performing soft contact, buffering the braking of the car for the first time until it contacts multiple impact piles. At this time, the contact of the protection module with the movable wedge block is converted from soft contact to hard contact, and during the continuous descent of the car, a continuous pressure is exerted on the impact piles, causing the impact piles to break successively upward along the directions of multiple fracture grooves, releasing energy multiple times in a short period until the movable wedge block contacts the connecting cylinder. At this time, the movable wedge block, the fixed wedge block and the guide rail complete self-locking, and the self-locking work of the elevator car is completed.

[0018] During the process of the elevator from excessive speed out of control to complete braking, compared with the single impact during the braking process of the traditional elevator car, in this application, first, the soft contact with the second compression spring is used to buffer the impact generated by the braking of the elevator car for the first time, and then the successive fracture of the impact piles is used to buffer the impact generated by the braking of the elevator car multiple times, greatly reducing the intensity of the single impact, reducing the harm to the elevator passengers, and increasing the safety of the elevator braking.

[0019] At the same time, the presence of the safety module and the buffer net can capture the fractured parts of the impact piles. On the one hand, it facilitates the subsequent recovery work, and on the other hand, it can also prevent the fractured parts of the flying impact piles from damaging other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded view of the main structure of the progressive safety gear according to the first embodiment of the present application;

[0021] Figure 2 It is a schematic structural diagram of the progressive safety gear according to the first embodiment of the present application;

[0022] Figure 3 It is a front view of the progressive safety gear according to the first embodiment of the present application;

[0023] Figure 4 It is a schematic sectional structure diagram at the safety gear lifting unit according to the first embodiment of the present application;

[0024] Figure 5 It is a schematic structural diagram of the lifting unit according to the first embodiment of the present application;

[0025] Figure 6 It is a schematic structural diagram of the protection module according to the first embodiment of the present application;

[0026] Figure 7 It is a front sectional view of the protection module according to the first embodiment of the present application;

[0027] Figure 8Front view of the progressive safety clamp according to the second embodiment of the present application;

[0028] Figure 9 Schematic structural diagram of the safety module according to the second embodiment of the present application;

[0029] Figure 10 Front sectional view of the safety module according to the second embodiment of the present application.

[0030] Explanation of the reference numerals in the figure:

[0031] 1 safety clamp base, 2 fixed wedge block, 3 movable wedge block, 4 fixed pin, 5 lifting unit, 501 lifting block, 502 sliding hole, 503 lifting rod, 504 connecting block, 505 limiting column, 506 first compression spring, 6 U-shaped spring plate, 7 fixed threaded column, 8 protection module, 801 connecting cylinder, 802 ventilation hole, 803 movable part, 804 second compression spring, 805 impact pile, 806 fracture groove, 9 safety module, 901 bellows, 902 disassembly groove, 10 buffer net, 11 counterweight ring. Specific embodiments

[0032] The following will describe in detail the two embodiments of the present application with reference to the accompanying drawings.

[0033] The first embodiment:

[0034] Figures 1-7 A safety clamp for an elevator lifting system is shown, including a safety clamp base 1 and a lifting unit 5. A pair of fixed wedge blocks 2 are fixedly connected inside the safety clamp base 1. A pair of mutually matching movable wedge blocks 3 are arranged between the two fixed wedge blocks 2. The two movable wedge blocks 3 are respectively located on both sides of the guide rail. Fixed pins 4 are inserted into both of the two movable wedge blocks 3. The lifting unit 5 includes a lifting block 501. A limiting column 505 matching the two fixed pins 4 is drilled on the lifting block 501. Both of the two fixed pins 4 penetrate through the sliding hole 502 and extend to the side of the sliding hole 502 away from the movable wedge block 3. The upper end of the sliding hole 502 is fixedly connected with a lifting rod 503. The end of the lifting rod 503 away from the sliding hole 502 penetrates through the safety clamp base 1 and extends to the upper side of the safety clamp base 1. A connecting block 504 is fixedly connected to the upper side of the lifting rod 503. The connecting block 504 is fixedly connected with the lifting structure;

[0035] A pair of protection modules 8 that match the positions of the two movable wedges 3 are fixedly connected to the upper inner wall of the safety clamp base 1. The protection module 8 includes a connecting tube 801. A plurality of air holes 802 are drilled on the upper side wall of the connecting tube 801. A movable part 803 is slidably connected inside the connecting tube 801. One end of the movable part 803 passes through the lower end of the connecting tube 801 and extends to the lower side of the connecting tube 801. A compression spring 2 804 is fixedly connected between the movable part 803 and the connecting tube 801. A plurality of impact piles 805 are fixedly connected to the lower end of the connecting tube 801. The plurality of impact piles 805 are all tightly attached to the movable part 803. The inner walls of the plurality of impact piles 805 are all drilled with a plurality of fracture grooves 806. The depth of the plurality of fracture grooves 806 becomes shallower as the distance from the connecting tube 801 decreases.

[0036] In this application, when the elevator overspeeds or falls out of control, the speed limiter is activated, driving the lifting mechanism to pull the lifting unit 5 and the two movable wedges 3 upward until the movable wedge 3 is stuck with the fixed wedge 2 and the guide rail, forming a self-locking function, so that the elevator car connected to the safety clamp base 1 completes braking.

[0037] When the movable wedge 3 is being pulled up but not yet completely stuck, it will come into contact with the movable part 803. In the initial stage of contact with the movable part 803, it pushes the compression spring 2 804 to be compressed, making soft contact and performing the first buffering of the braking of the car. After that, the movable part 803 continues to move upward under the action of the movable wedge 3 until it comes into contact with multiple impact piles 805. At this time, the contact of the protective module 8 on the movable wedge 3 is converted from soft contact to hard contact, and in the process of continuous descent of the car, continuous pressure is exerted on the impact piles 805, causing the impact piles 805 to break from bottom to top in the direction of multiple fracture grooves 806 until the movable wedge 3 comes into contact with the connecting tube 801, and multiple energy releases are performed in a short time. At this time, the movable wedge 3 is self-locked with the fixed wedge 2 and the guide rail, and the self-locking work of the elevator car is completed.

[0038] During the process from the elevator overspeeding and losing control to the completion of braking, compared with the single impact during the braking process of the traditional elevator car, the present application first uses the soft contact between the compression spring 2 804 to perform the first buffering of the impact generated by the elevator car braking, and then uses the layer-by-layer breaking of the impact pile 805 to buffer the impact generated by the elevator car braking multiple times, thereby greatly reducing the intensity of the single impact, reducing the damage to the elevator passengers, and increasing the safety of the elevator braking.

[0039] In particular, the limiter, lifting mechanism and its auxiliary structures mentioned in this embodiment are well-known technologies to those skilled in the art. Therefore, those skilled in the art can make reasonable designs based on existing technologies to meet the usage requirements of this application. Therefore, the corresponding content is not disclosed in detail in this application.

[0040] A U-shaped spring plate 6 is sleeved outside the two fixed wedges 2. Fixed threaded columns 7 are fixedly connected to both side walls of the U-shaped spring plate 6 away from the fixed wedges 2. One ends of the two fixed threaded columns 7 away from the U-shaped spring plate 6 penetrate through the side walls of the safety clamp base 1. Locking nuts are threadedly connected to the two fixed threaded columns 7, and the locking nuts are in contact with the side walls of the safety clamp base 1. The U-shaped spring plate 6 is used to damp the working process of the fixed wedges 2 and the movable wedges 3, increasing the stability of the safety clamp during operation.

[0041] The upper end of the connecting cylinder 801 is fixedly connected with a threaded head. The protection module 8 is fixedly connected to the safety clamp base 1 through the threaded head. The threaded connection enables quick installation and disassembly of the entire protection module 8, facilitating maintenance personnel to replace the protection module 8 that has become ineffective in a timely manner.

[0042] The structural strength of the movable part 803 and the connecting cylinder 801 is the same, and the structural strength of the movable part 803 and the connecting cylinder 801 is greater than that of the impact pile 805, while the structural strength of the movable part 803 and the connecting cylinder 801 is less than that of the threaded head. On the one hand, when the impact pile 805 still exists, the movable part 803 and the impact pile 805 are not easily directly deformed under external forces, and it is not easy to cause the failure of the protection module 8. After all the impact piles 805 are broken, when the movable wedge 3 continues to apply pressure, it will first cause the complete deformation of the movable part 803 and the connecting cylinder 801, and the threaded head is easy to maintain its structural integrity, facilitating subsequent replacement work.

[0043] A compression spring 506 is fixedly connected between the two fixed pins 4. The compression spring 506 is located in the sliding hole 502. When there is no external force acting on the movable wedge 3, the two movable wedges 3 are separated from each other, and it is not easy to have excessive wear between the two movable wedges 3 and the guide rail during the operation of the elevator, and it is not easy to affect the subsequent braking work of the elevator car. A limit post 505 is inserted into the compression spring 506. The limit post 505 penetrates through the two fixed pins 4 respectively and is fixedly connected to the inner wall of the sliding hole 502. The existence of the limit post 505 can, on the one hand, limit the sliding of the two movable wedges 3 and the fixed pins 4, reducing the impact on the subsequent self-locking of the safety clamp. On the other hand, the limit post 505 can prevent the compression spring 506 from deforming in a non-working direction, reducing the possibility of the compression spring 506 failing due to non-working deformation.

[0044] The second implementation method:

[0045] Figures 8-10A safety tong for an elevator lifting system is shown. A safety module 9 is sleeved outside the connecting cylinder 801. The safety module 9 is made of an elastic material as a whole. The safety module 9 includes a corrugated pipe 901. A disassembly groove 902 is drilled at the upper end of the corrugated pipe 901. A buffer net 10 is fixedly connected to the upper inner wall of the corrugated pipe 901. A counterweight ring 11 is fixedly connected to the lower end of the buffer net 10.

[0046] When the impact pile 805 deforms under the pressure of the movable wedge 3, due to the action of the movable part 803, the impact pile 805 can only deform in the direction away from the movable part 803. When the impact pile 805 breaks along the fracture groove 806, the impact generated by the fracture will cause the broken part of the impact pile 805 to fly out directly. The presence of the safety module 9 and the buffer net 10 can capture the broken part of the impact pile 805. On the one hand, it facilitates the subsequent recovery work. On the other hand, it can also prevent the broken part of the flying impact pile 805 from damaging other components.

[0047] The buffer net 10 is woven from a high-toughness material. The area of the woven mesh holes of the buffer net 10 is 0.9 times the cross-sectional area of the impact pile 805, making it easy for the buffer net 10 to capture the broken part of the flying impact pile 805 and facilitating subsequent unified recovery.

[0048] The outer wall of the connection between the connecting cylinder 801 and the safety module 9 is a matte surface. There is an interference fit between the connecting cylinder 801 and the corrugated pipe 901, increasing the connection strength between the protection module 8 and the safety module 9, making it difficult for the safety module 9 and the buffer net 10 to fall off. At the same time, the drilling of the disassembly groove 902 facilitates the removal of the interference-fitted safety module 9 from the protection module 8.

[0049] Compared with the first embodiment, in this embodiment, the safety module 9 and the buffer net 10 are installed on the protection module 8 to capture the broken part of the impact pile 805. On the one hand, it facilitates the subsequent recovery work. On the other hand, it can also prevent the broken part of the flying impact pile 805 from damaging other components. However, relatively speaking, the safety module 9 and the buffer net 10 need to be replaced together with the protection module 8 to ensure their reliability. At the same time, the corrosion resistance of the safety module 9 and the buffer net 10 is not as good as that of the protection module 8. Even if the protection module 8 is not enabled, the buffer net 10 needs to be replaced regularly, increasing the use and maintenance costs. Maintenance personnel can select according to actual needs.

[0050] Combined with the current actual needs, the above embodiments adopted in this application, the protection scope is not limited thereto. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A safety tong for an elevator lifting system, comprising a safety tong base (1) and a lifting unit (5), characterized in that: A pair of fixed wedges (2) are fixedly connected inside the safety clamp base (1). A pair of matching movable wedges (3) are arranged between the two fixed wedges (2). Fixed pins (4) are inserted into both of the two movable wedges (3). The lifting unit (5) includes a lifting block (501). A limiting column (505) matching the two fixed pins (4) is drilled on the lifting block (501). Both of the two fixed pins (4) penetrate through the sliding hole (502) and extend to the side of the sliding hole (502) far from the movable wedge (3). A lifting rod (503) is fixedly connected to the upper end of the sliding hole (502). One end of the lifting rod (503) far from the sliding hole (502) penetrates through the safety clamp base (1) and extends to the upper side of the safety clamp base (1). A connecting block (504) is fixedly connected to the upper side of the lifting rod (503). A pair of protection modules (8) respectively matching the positions of the two movable wedges (3) are fixedly connected to the upper inner wall of the safety clamp base (1). The protection module (8) includes a connecting cylinder (801). A plurality of ventilation holes (802) are drilled on the side wall of the upper end of the connecting cylinder (801). A movable part (803) is slidably connected inside the connecting cylinder (801). One end of the movable part (803) penetrates through the lower end of the connecting cylinder (801) and extends to the lower side of the connecting cylinder (801). A second compression spring (804) is fixedly connected between the movable part (803) and the connecting cylinder (801). A plurality of impact piles (805) are fixedly connected to the lower end of the connecting cylinder (801). All of the plurality of impact piles (805) are closely attached to the movable part (803). A plurality of fracture grooves (806) are drilled on the inner walls of all of the plurality of impact piles (805). The depths of the plurality of fracture grooves (806) become shallower as the distance from the connecting cylinder (801) decreases.

2. The safety tongs for an elevator lifting system according to claim 1, characterized in that: A U-shaped spring plate (6) is sleeved outside the two fixed wedges (2). Fixed threaded columns (7) are fixedly connected to the two side walls of the U-shaped spring plate (6) far from the fixed wedges (2). One end of each of the two fixed threaded columns (7) far from the U-shaped spring plate (6) penetrates through the side wall of the safety clamp base (1). Locking nuts are threadedly connected to both of the two fixed threaded columns (7), and the locking nuts are in contact with the side wall of the safety clamp base (1).

3. The safety tongs for an elevator lifting system according to claim 1, characterized in that: A threaded head is fixedly connected to the upper end of the connecting cylinder (801). The protection module (8) is fixedly connected to the safety clamp base (1) through the threaded head.

4. The safety tongs for an elevator lifting system according to claim 1, characterized in that: The structural strengths of the movable part (803) and the connecting cylinder (801) are the same, and the structural strengths of the movable part (803) and the connecting cylinder (801) are greater than the structural strength of the impact pile (805), and the structural strengths of the movable part (803) and the connecting cylinder (801) are less than the structural strength of the threaded head.

5. The safety tongs for an elevator lifting system according to claim 1, characterized in that: A first compression spring (506) is fixedly connected between the two fixed pins (4). The first compression spring (506) is located inside the sliding hole (502).

6. The safety tongs for an elevator lifting system according to claim 5, characterized in that: A limiting post (505) is inserted into the compression spring I (506), and the limiting post (505) penetrates through two fixing pins (4) respectively and is fixedly connected to the inner wall of the sliding hole (502).

7. The safety tongs for an elevator lifting system according to claim 1, characterized in that: A safety module (9) is sleeved outside the connecting cylinder (801). The safety module (9) is integrally made of an elastic material. The safety module (9) includes a corrugated pipe (901). A disassembly groove (902) is drilled at the upper end of the corrugated pipe (901). A buffer net (10) is fixedly connected to the upper inner wall of the corrugated pipe (901), and a counterweight ring (11) is fixedly connected to the lower end of the buffer net (10).

8. A safety tong for an elevator lifting system according to claim 7, characterized in that: The buffer net (10) is woven from a high-toughness material, and the area of the woven mesh holes of the buffer net (10) is 0.9 times the cross-sectional area of the impact pile (805).

9. The safety tongs for an elevator lifting system according to claim 7, characterized in that: The outer wall of the connection part between the connecting cylinder (801) and the safety module (9) is a matte surface, and an interference fit is provided between the connecting cylinder (801) and the corrugated pipe (901).

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