Safety clamp linkage brake structure for freight elevator

Abstract

The present application provides a safety clamp linkage brake structure for a freight elevator, including a shaft, a car is arranged inside the shaft, guide rails are arranged on both sides of the car, a connecting rope is arranged on one side of the car, two trigger assemblies are arranged on both sides of the top of the car, the front ends of the two trigger assemblies are provided with the same transmission assembly, a protection assembly and an air chamber are arranged between the two trigger assemblies, the protection assembly and the air chamber are connected by a mechanical valve, a switch assembly is arranged at the front end of the mechanical valve, and a limit assembly is arranged on one side of the protection assembly. The present application provides a trigger assembly and a protection assembly, when the elevator loses control and the car rises rapidly, and the speed limiter is stuck due to overspeed movement, the transmission assembly pulls the trigger assembly, clamps the guide rail for braking, and at the same time, the mechanical valve is opened by the switch assembly, so that the protection assembly has a buffering performance to protect the people inside the car.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to a safety clamp linkage braking structure of a freight elevator. Background Art

[0002] Most of the elevator braking devices and buffer devices in the prior art are designed to prevent the elevator from falling rapidly. However, when the weight of the car is lighter than the counterweight, if an elevator malfunctions, causing the car to rise rapidly, and the protective measures when the elevator rises rapidly are insufficient, the buffering effect of the elevator on the car is poor, which can easily cause casualties.

[0003] For example, the "elevator braking device" disclosed in the utility model patent (application number: 200810043211.8) discloses in its specification: it includes two parts, a brake member and a brake mechanism. When and only when the elevator car goes up and exceeds the uppermost stop position of its normal operation, the brake mechanism interacts with the brake member to make the elevator braking device actuate and hinder the elevator from moving upward; of the two parts of the brake member and the brake mechanism, any one part can move with the elevator car and is installed on the car or related parts connected thereto, and the other part is installed in a fixed position and does not move with the elevator car; the elevator braking device is a one-way mechanism. When the elevator braking device is actuated, the elevator car can generate a force that hinders the elevator from moving upward, and when the elevator car goes down, the force of the elevator braking device will decrease or disappear. The present invention can ensure that the friction between the suspension device and the driving wheel is sufficient to ensure that the lightweight car runs under normal operating conditions and ensures the safety of the car under the condition of detention; the above patent can prove the defects of the prior art.

[0004] Therefore, we made improvements to this and proposed a safety clamp linkage brake structure for the freight elevator. Summary of the invention

[0005] The utility model aims to solve the problem that the existing elevator has poor buffering effect on the elevator car, which easily causes casualties.

[0006] In order to achieve the above-mentioned purpose of the invention, the utility model provides a safety clamp linkage brake structure for a freight elevator to improve the above-mentioned problem.

[0007] The specific application is as follows:

[0008] It includes a shaft, a car is arranged inside the shaft, guide rails are arranged on both sides of the car, a connecting rope is arranged on one side of the car, two trigger assemblies are arranged on both sides of the top of the car, the front ends of the two trigger assemblies are provided with a same transmission assembly, a protection assembly and an air chamber are arranged between the two trigger assemblies, the protection assembly and the air chamber are connected by a mechanical valve, a switch assembly is arranged at the front end of the mechanical valve, and a limit assembly is arranged on one side of the protection assembly.

[0009] As a preferred technical solution of the present application, connecting blocks are fixedly provided on both sides of the top of the car, and a hinged seat is fixedly provided on the top of the car.

[0010] As a preferred technical solution of the present application, the trigger assembly includes an installation box fixed to the top of the connecting block, a No. 1 slide groove is opened inside the installation box, and trapezoidal grooves located on both sides of the No. 1 slide groove are opened at the bottom of the installation box.

[0011] As a preferred technical solution of the present application, the guide rail is located inside the No. 1 slide groove, and trapezoidal blocks are provided inside the trapezoidal grooves.

[0012] As a preferred technical solution of the present application, the transmission assembly includes a No. 2 connecting rod fixedly connected to the bottom end of the trapezoidal block, a No. 3 connecting rod is fixedly provided at the bottom end of the No. 2 connecting rod, the front ends of the four No. 3 connecting rods are hingedly provided with the same No. 1 connecting rod, and the No. 1 connecting rod is located near the middle and is sleeved with a sliding column.

[0013] As a preferred technical solution of the present application, the limiting assembly includes a No. 1 connecting plate hinged to the end of the hinged seat, a No. 2 slide groove is opened at the end of the No. 1 connecting plate, a No. 2 connecting plate is slidably provided inside the No. 2 slide groove, the No. 2 connecting plate is rotatably connected to the sliding column at a position near the end, the end of the No. 2 connecting plate is rotatably connected to the transmission rod, one end of the transmission rod is fixedly connected to the connecting rope, the bottom end of the No. 2 connecting plate is fixedly provided with a spring, and the bottom end of the spring is fixedly connected to the car.

[0014] As a preferred technical solution of the present application, the protection component includes a No. 2 slide fixedly arranged at the top of the car, the No. 2 slide being located on one side of the hinged seat, a No. 3 slide being slidingly arranged inside the No. 2 slide, a No. 4 slide being slidingly arranged inside the No. 3 slide, and an airbag being fixedly arranged at the top of the No. 4 slide and connected to the interior of the No. 4 slide.

[0015] As a preferred technical solution of the present application, the air bin is located on one side of the second slide, the air bin is fixedly connected to the car, and compressed air is provided inside the air bin.

[0016] As a preferred technical solution of the present application, the mechanical valve includes a connecting tube located between the air bin and the No. 2 slide cylinder, the two ends of the connecting tube are respectively connected to the interior of the air bin and the interior of the No. 2 slide cylinder, the top end of the connecting tube is connected to the No. 1 slide cylinder, the interior of the No. 1 slide cylinder is provided with a movable block for sliding, the bottom end of the movable block is provided with two blocking blocks fixedly connected to the connecting tube, and the front end of the blocking block is provided with a sealing plate.

[0017] As a preferred technical solution of the present application, the switch assembly includes two No. 3 connecting plates fixedly arranged at the front end of the connecting cylinder, a connecting column is rotatably provided between the two No. 3 connecting plates, a No. 4 connecting plate is fixedly provided at the top of the connecting column, one end of the No. 4 connecting plate is in contact with the bottom end of the No. 1 connecting rod, and a trigger rope is provided at the other end of the No. 4 connecting plate, one end of which is fixedly connected to the movable block.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] In the scheme of this application:

[0020] 1. In order to solve the problem that the buffering effect of the elevator on the car is poor in the prior art, which is easy to cause casualties, the present application sets a trigger component and a protection component to achieve that when the elevator is out of control, the car rises quickly, and the speed limiter is stuck due to overspeed movement, the connecting rope pulls the trigger component through the transmission component, so that it clamps the guide rail for braking, and at the same time the transmission component pulls the trigger component, the switch component opens the mechanism valve, so that the compressed air inside the air chamber is transmitted to the protection component, so that it expands and has buffering performance, as the final stop buffer device;

[0021] 2. In order to solve the problem in the prior art that the brake device will not be triggered at will, the present application sets a limit assembly to achieve the elastic force of the spring so that the transmission assembly will not pull the trigger assembly under normal circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of the car in the safety caliper linkage brake structure of the freight elevator provided in this application;

[0023] Figure 2 A schematic diagram of the structure of the safety caliper linkage brake structure of the freight elevator provided in this application;

[0024] Figure 3 A schematic diagram of the structure of a trigger component in the safety clamp linkage brake structure of a freight elevator provided in this application;

[0025] Figure 4 A schematic diagram of the structure of the limiter assembly in the safety clamp linkage brake structure of the freight elevator provided in this application;

[0026] Figure 5A schematic diagram of the structure of the protection components in the safety clamp linkage brake structure of the freight elevator provided in this application;

[0027] Figure 6 for Figure 5 A magnified view of middle;

[0028] Figure 7 A schematic diagram of the structure of a switch assembly in the safety clamp linkage brake structure of a freight elevator provided in this application;

[0029] Figure 8 A side structural schematic diagram of a switch assembly in the safety clamp linkage brake structure of the freight elevator provided in this application.

[0030] Indicated in the figure:

[0031] 1. Car; 2. Guide rail;

[0032] 3. Trigger assembly; 31. Mounting box; 32. No. 1 slideway; 33. Trapezoidal groove; 34. Trapezoidal block;

[0033] 4. Transmission assembly; 41. No. 1 connecting rod; 42. No. 2 connecting rod; 43. No. 3 connecting rod; 44. Sliding column;

[0034] 5. Limiting assembly; 51. No. 1 connecting plate; 52. No. 2 slideway; 53. No. 2 connecting plate; 54. Spring; 55. Transmission rod;

[0035] 6. Mechanical valve; 61. Connecting cylinder; 62. Sealing plate; 63. Block; 64. No. 1 slide cylinder; 65. Moving block;

[0036] 7. Switch assembly; 71. No. 3 connecting plate; 72. Connecting column; 73. No. 4 connecting plate; 74. Trigger rope;

[0037] 8. Gas chamber;

[0038] 9. Protection assembly; 91. No. 2 slide; 92. No. 3 slide; 93. No. 4 slide; 94. Airbag;

[0039] 10. Connecting block; 11. Articulated seat; 12. Speed ​​limiter; 13. Connecting rope. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0041] As described in the background art, the elevator lacks a braking device when the car rises rapidly, which can easily cause casualties.

[0042] In order to solve this technical problem, the utility model provides a safety clamp linkage brake structure for a freight elevator, which is applied in the technical field of elevators.

[0043] Specifically, please refer to Figure 1-8 The safety clamp linkage brake structure of the freight elevator specifically includes:

[0044] It includes a shaft, and a car 1 is arranged inside the shaft, guide rails 2 are arranged on both sides of the car 1, a connecting rope 13 is arranged on one side of the car 1, two trigger components 3 are arranged on both sides of the top of the car 1, the front ends of the two trigger components 3 are provided with a same transmission component 4, a protection component 9 and an air chamber 8 are arranged between the two trigger components 3, the protection component 9 and the air chamber 8 are connected by a mechanical valve 6, a switch component 7 is arranged at the front end of the mechanical valve 6, and a limit component 5 is arranged on one side of the protection component 9.

[0045] The safety clamp linkage brake structure of the freight elevator provided by the utility model realizes, through the arranged trigger component 3 and protection component 9, that when the elevator loses control, the car 1 rises rapidly, and the overspeed movement causes the speed limiter 12 to stop, the connecting rope 13 pulls the trigger component 3 through the transmission component 4, so that it clamps the guide rail 2 for braking, and at the same time when the transmission component 4 pulls the trigger component 3, the switch component 7 opens the machine valve 6, so that the compressed air inside the air chamber 8 is transmitted to the protection component 9, so that it expands and has a buffering performance, serving as a final stop buffer device.

[0046] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] Example 1, please refer to Figure 1-4, a safety clamp linkage braking structure for a freight elevator, wherein connecting blocks 10 are fixedly arranged on both sides of the top of the car 1, and a speed limiter 12 is arranged at the bottom of the shaft. The speed limiter 12 comprises a rope wheel, a centrifugal hook and a linkage mechanism. The rope wheel is the main rotating part of the speed limiter. When the elevator is running, the rope wheel will also rotate accordingly. The centrifugal hook is on one side of the rope wheel. When the rotation speed of the rope wheel exceeds the preset value, the centrifugal hook will move due to centrifugal force, triggering the corresponding linkage mechanism to prevent the rope wheel and the connecting rope 13 from rotating. The speed limiter 12 is a triggering device of a common safety clamp. A pulley is arranged at the top of the shaft. One end of the connecting rope 13 bypasses the rope wheel inside the speed limiter 12 and the pulley at the top of the shaft, so that it can pull the connecting rope 13 within the specified speed range. When the car 1 connected to the connecting rope 13 rises rapidly, the hook in the middle of the speed limiter 12 is thrown out of the hook that is stuck on the edge due to inertia to stop it. An articulated seat 11 is fixedly arranged at the top of the car 1, and the articulated seat 11 is used to install a limit assembly 5.

[0050] Further, such as Figure 3 As shown, the trigger assembly 3 includes a mounting box 31 fixed to the top of the connecting block 10, and the connecting block 10 is used to connect the trigger assembly 3 and the car 1. A No. 1 slide groove 32 is opened inside the mounting box 31, and a trapezoidal groove 33 located on both sides of the No. 1 slide groove 32 is opened at the bottom of the mounting box 31. The top of the No. 1 slide groove 32 and the bottom of the connecting block 10 can be provided with wheels by rotation, so that the guide rail 2 will not directly contact the No. 1 slide groove 32, thereby reducing friction.

[0051] Further, such as Figure 3 As shown, the guide rail 2 is located inside the No. 1 slide groove 32, and trapezoidal blocks 34 are provided inside the trapezoidal grooves 33. When the two trapezoidal blocks 34 are pulled by the transmission assembly 4, they approach the middle through the inclined surfaces between the trapezoidal grooves 33 and the trapezoidal blocks 34, and the upward movement of the car 1 clamps the guide rail 2.

[0052] Further, such as Figure 2-4 As shown, the transmission assembly 4 includes a No. 2 connecting rod 42 fixedly connected to the bottom end of the trapezoidal block 34, a No. 3 connecting rod 43 is fixedly provided at the bottom end of the No. 2 connecting rod 42, and the front ends of the four No. 3 connecting rods 43 are hingedly provided with the same No. 1 connecting rod 41. The No. 3 connecting rod 43 and the No. 1 connecting rod 41 are hinged so that the transmission can be performed without affecting the closing of the two trapezoidal blocks 34. The No. 1 connecting rod 41 is located near the middle and is sleeved with a sliding column 44, which is used to connect with the limit assembly 5.

[0053] Further, such as Figure 4As shown, the limit assembly 5 includes a No. 1 connecting plate 51 hinged at the end of the hinge seat 11, a No. 2 slide groove 52 is opened at the end of the No. 1 connecting plate 51, and a No. 2 connecting plate 53 is slidably arranged inside the No. 2 slide groove 52. The No. 2 connecting plate 53 is connected to the No. 2 slide groove 52 of the No. 1 connecting plate 51 so that it can move forward downward when cooperating with the transmission. The position of the No. 2 connecting plate 53 near the end is rotatably connected to the sliding column 44, and the rotatable connection makes it rotate when the No. 2 connecting plate 53 moves downward. The end of the No. 2 connecting plate 53 is rotatably connected with the transmission The moving rod 55, one end of the transmission rod 55 is fixedly connected to the connecting rope 13, specifically, the two ends of the connecting rope 13 are respectively passed around the pulley at the top of the well and the rope wheel of the speed limiter 12 at the bottom of the well, and the two ends of the connecting rope 13 are fixedly connected to the transmission rod 55. When the car 1 moves up and down normally, the connecting rope 13 is moved along with it through the transmission rod 55. The bottom end of the second connecting plate 53 is fixedly provided with a spring 54. The spring 54 prevents the limit assembly 5 and the transmission assembly 4 from pulling the trigger assembly 3 when moving at a normal speed. The bottom end of the spring 54 is fixedly connected to the car 1.

[0054] Embodiment 2 further optimizes the safety tongs linkage brake structure of the freight elevator provided in Embodiment 1. Specifically, Figure 5 As shown, the protection component 9 includes a No. 2 slide 91 fixed on the top of the car 1, and the No. 2 slide 91 is located on one side of the hinge seat 11. The No. 2 slide 91 is internally slidably provided with a No. 3 slide 92, and the No. 3 slide 92 is internally slidably provided with a No. 4 slide 93. When the compressed air inside the air chamber 8 is transmitted to the No. 2 slide 91, the No. 3 slide 92 and the No. 4 slide 93 through the mechanical valve 6, it moves upward through the sliding connection therebetween. The top of the No. 4 slide 93 is fixedly provided with an air bag 94 connected to the interior of the No. 4 slide 93. When the compressed air enters the No. 2 slide 91, the air bag 94 is instantly filled, so that it serves as a buffer for the car 1. Together with the No. 3 slide 92 and the No. 4 slide 93, the buffering effect is better.

[0055] Further, such as Figure 2 and Figure 5 As shown, the air bin 8 is located on one side of the second slide 91 , the air bin 8 is fixedly connected to the car 1 , and compressed air is provided inside the air bin 8 .

[0056] Further, such as Figure 5 and Figure 6As shown, the mechanical valve 6 includes a connecting tube 61 located between the gas bin 8 and the No. 2 slide 91, and the two ends of the connecting tube 61 are respectively connected to the interior of the gas bin 8 and the interior of the No. 2 slide 91, and the top of the connecting tube 61 is connected to a No. 1 slide 64, and a movable block 65 is provided inside the No. 1 slide 64 for sliding. A blocking ring is provided outside the movable block 65 to prevent the movable block 65 from sliding out of the No. 1 slide 64 to cause gas loss. Two blocking blocks 63 fixedly connected to the connecting tube 61 are provided at the bottom end of the movable block 65, and a sealing plate 62 is provided at the front end of the blocking block 63. When the movable block 65 moves upward through the switch assembly 7, the bottom of the movable block 65 no longer blocks the sealing plate 62, and the top of the sealing plate 62 lacks a blockage, so that it is flushed open by the compressed gas, so that the compressed air flows into the interior of the protection assembly 9.

[0057] Further, such as Figure 7 and Figure 8 As shown, the switch assembly 7 includes two No. 3 connecting plates 71 fixedly arranged at the front end of the connecting cylinder 61, a connecting column 72 is rotatably provided between the two No. 3 connecting plates 71, and a No. 4 connecting plate 73 is fixedly provided at the top of the connecting column 72, and one end of the No. 4 connecting plate 73 contacts the bottom end of the No. 1 connecting rod 41. When the car 1 moves upward at an excessive speed, the speed limiter 12 is stuck, causing the connecting rope 13 to stop, and the speed difference between the rising of the car 1 and the sudden stop of the connecting rope 13 pulls the No. 2 connecting plate 53, thereby breaking through the elastic force of the spring 54 and pressing downward, so that the No. 1 connecting rod 41 also moves downward and presses the No. 4 connecting plate 73, and the other end of the No. 4 connecting plate 73 is provided with a trigger rope 74, one end of the trigger rope 74 is fixedly connected to the movable block 65, and the No. 1 connecting rod 41 also moves downward to press the No. 4 connecting plate 73 downward, so that the other end of the No. 4 connecting plate 73 is tilted and the movable block 65 is pulled through the trigger rope 74, so that the sealing plate 62 is broken through by the compressed air, and the compressed air enters the protection component 9 to unfold it.

[0058] The use process of the safety clamp linkage brake structure of the freight elevator provided by the utility model is as follows:

[0059] When the car 1 moves upward at an excessive speed, the speed limiter 12 is stuck, causing the connecting rope 13 to stop. The speed difference between the rising of the car 1 and the sudden stop of the connecting rope 13 pulls the second connecting plate 53, thereby breaking through the elastic force of the spring 54 and pressing downward, so that the No. 1 connecting rod 41 also moves downward, and the two trapezoidal blocks 34 are pulled downward by the No. 2 connecting rod 42 and the No. 3 connecting rod 43, and move toward the middle through the inclined surface to clamp the guide rail 2, so that the car 1 slows down and stops; while the No. 1 connecting rod 41 moves downward, the No. 4 connecting plate 73 is pressed downward, so that the other end of it is tilted and the movable block 65 is pulled through the trigger rope 74, so that the sealing plate 62 is broken through by the compressed air, and the compressed air enters the protection component 9 to expand it, and the principle that gas is easily compressed is used to achieve buffering, as the last protection device.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A safety tongs linkage brake structure for a freight elevator, characterized in that: The invention comprises a hoistway, wherein a car (1) is arranged inside the hoistway, guide rails (2) are arranged on both sides of the car (1), a connecting rope (13) is arranged on one side of the car (1), two trigger assemblies (3) are arranged on both sides of the top of the car (1), the front ends of the two trigger assemblies (3) are provided with a same transmission assembly (4), a protection assembly (9) and an air chamber (8) are arranged between the two trigger assemblies (3), the protection assembly (9) and the air chamber (8) are connected via a mechanical valve (6), a switch assembly (7) is arranged at the front end of the mechanical valve (6), and a limit assembly (5) is arranged on one side of the protection assembly (9).

2. The safety tongs linkage brake structure of a freight elevator according to claim 1, characterized in that: Connecting blocks (10) are fixedly provided on both sides of the top of the car (1), and a hinge seat (11) is fixedly provided on the top of the car (1).

3. The safety tongs linkage brake structure of a freight elevator according to claim 2, characterized in that: The trigger assembly (3) comprises a mounting box (31) fixedly mounted on the top of the connecting block (10), a first slide groove (32) being provided inside the mounting box (31), and trapezoidal grooves (33) located on both sides of the first slide groove (32) being provided at the bottom of the mounting box (31).

4. The safety tongs linkage brake structure of a freight elevator according to claim 3, characterized in that: The guide rail (2) is located inside the No. 1 slide groove (32), and the inside of the trapezoidal groove (33) is provided with a trapezoidal block (34).

5. The safety tongs linkage brake structure of a freight elevator according to claim 4, characterized in that: The transmission assembly (4) comprises a No. 2 connecting rod (42) fixedly connected to the bottom end of the trapezoidal block (34); a No. 3 connecting rod (43) is fixedly provided at the bottom end of the No. 2 connecting rod (42); the front ends of the four No. 3 connecting rods (43) are hingedly provided with a same No. 1 connecting rod (41); and a sliding column (44) is sleeved on the No. 1 connecting rod (41) at a position close to the middle.

6. The safety tongs linkage brake structure of a freight elevator according to claim 5, characterized in that: The limiting assembly (5) comprises a No. 1 connecting plate (51) hinged to the end of the hinge seat (11), a No. 2 slide groove (52) is provided at the end of the No. 1 connecting plate (51), a No. 2 connecting plate (53) is slidably provided inside the No. 2 slide groove (52), the No. 2 connecting plate (53) is rotatably connected to the slide column (44) at a position close to the end, the end of the No. 2 connecting plate (53) is rotatably connected to a transmission rod (55), one end of the transmission rod (55) is fixedly connected to the connecting rope (13), the bottom end of the No. 2 connecting plate (53) is fixedly provided with a spring (54), and the bottom end of the spring (54) is fixedly connected to the car (1).

7. The safety tongs linkage brake structure of a freight elevator according to claim 6, characterized in that: The protection component (9) comprises a No. 2 slide (91) fixedly arranged at the top end of the car (1), the No. 2 slide (91) being located at one side of the hinge seat (11), a No. 3 slide (92) being slidably arranged inside the No. 2 slide (91), a No. 4 slide (93) being slidably arranged inside the No. 3 slide (92), and an air bag (94) being fixedly arranged at the top end of the No. 4 slide (93) and being connected to the interior of the No. 4 slide (93).

8. The safety tongs linkage brake structure of a freight elevator according to claim 7, characterized in that: The air bin (8) is located on one side of the second slide cylinder (91), the air bin (8) is fixedly connected to the car (1), and compressed air is provided inside the air bin (8).

9. The safety tongs linkage brake structure of a freight elevator according to claim 8, characterized in that: The mechanical valve (6) includes a connecting tube (61) located between the gas bin (8) and the No. 2 slide (91), the two ends of the connecting tube (61) are respectively connected to the interior of the gas bin (8) and the interior of the No. 2 slide (91), the top end of the connecting tube (61) is connected to the No. 1 slide (64), the interior of the No. 1 slide (64) is provided with a movable block (65) for sliding, the bottom end of the movable block (65) is provided with two blocking blocks (63) fixedly connected to the connecting tube (61), and the front end of the blocking block (63) is provided with a sealing plate (62).

10. A safety tongs linkage brake structure for a freight elevator according to claim 9, characterized in that: The switch assembly (7) comprises two No. 3 connecting plates (71) fixedly arranged at the front end of the connecting cylinder (61), a connecting column (72) being rotatably arranged between the two No. 3 connecting plates (71), a No. 4 connecting plate (73) being fixedly arranged at the top end of the connecting column (72), one end of the No. 4 connecting plate (73) being in contact with the bottom end of the No. 1 connecting rod (41), and a trigger rope (74) being arranged at the other end of the No. 4 connecting plate (73), and one end of the trigger rope (74) being fixedly connected to the movable block (65).

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