A mechanical overspeed protection device

Abstract

A mechanical overspeed protection device includes a hydraulic cylinder, a drive sprocket, a rotating disk, a linkage rod, a centrifugal assembly, a hydraulic pump, and a support. The support includes a base plate, a left plate, a middle plate, and a right plate. The bottom of the left plate is connected to the top of the base plate, the bottom of the middle plate is connected to the top of the base plate, and the bottom of the right plate is connected to the top of the base plate. The left end of the drive sprocket is connected to the top of the left plate, and the middle section of the drive sprocket is connected to the top of the middle plate. A rotating disk is fitted onto the side of the drive sprocket near the middle plate. The drive sprocket and the rotating disk are coaxially connected. The rotating disk is positioned between the left and middle plates. The right end of the drive sprocket is connected to the inner side of the geared disc. A linkage rod is inserted into the side of the rotating disk. This design transmits the power of the rotating component to the hydraulic pump, thereby providing reliable hydraulic power for a large load on the brake, achieving timely braking to meet the safety protection requirements of overspeed braking for large equipment.

Description

Technical Field

[0001] This invention relates to an improvement in braking protection device technology, belonging to the field of overspeed protection braking devices, and particularly to a mechanical overspeed protection device. Background Technology

[0002] In mine car hoisting or other heavy-duty cargo hoisting systems, safety brakes are commonly used as the winch's braking device. This braking device is powered by a spring, keeping the brake in a normally braking state. The brake is equipped with a hydraulic cylinder and a hydraulic pump station. By controlling the flow of hydraulic oil into and out of the cylinder to overcome the spring force, the brake can be opened; releasing the hydraulic oil allows the brake to close. Because the brake has a large braking load, the brake cylinder and control valve are relatively large, requiring significant operating force. In critical hoisting systems, such as heavy-load mine car hoisting systems, it is necessary to ensure that the hoisting system does not exceed the set speed under any circumstances (such as power loss, brake control valve jamming, etc.). Current overspeed protection devices cannot convert rotational power into hydraulic drive without external power and control signals, failing to address the issue of timely braking.

[0003] Chinese patent application CN201710319697.2, filed on May 9, 2017, discloses a mechanical overspeed protection device, including a housing, an axle, and a hydraulic brake valve. The axle passes through the housing, and a left and right centrifugal blocks are movably mounted on one end of the axle via a pin. A gear is fixedly sleeved on the other end of the axle. A brake spring is radially arranged between the left and right centrifugal blocks along the axle cross-section, and a pin is provided at the lower end of the right centrifugal block. An adjusting nut is provided at one end of the brake spring for adjusting its position. Fixed to the axle, the other end of the brake spring is also fixed with a spring shaft; the spring shaft engages with the smooth pin, and a hydraulic brake valve is fixed on the housing at the corresponding position of the spring shaft via a connecting plate. The brake valve includes a short swing rod for controlling the hydraulic brake valve. To ensure the speed limiting effect, when the engagement between the spring shaft and the smooth pin is disengaged, the natural length of the spring can ensure that the spring shaft fully presses against the short swing rod, thereby triggering the hydraulic brake valve to open and start the hydraulic braking system. However, it still cannot convert the rotational force into hydraulic drive, and cannot achieve the problem of timely braking of the brake.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this patent application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem in the prior art that the rotational force cannot be converted into hydraulic drive and the brake cannot be applied in a timely manner. This invention provides a mechanical overspeed protection device that can convert rotational force into hydraulic drive and apply the brake in a timely manner.

[0006] To achieve the above objectives, the technical solution of the present invention is: a mechanical overspeed protection device, which includes a hydraulic cylinder, a drive sprocket, a rotating disk, a linkage rod, a centrifugal assembly, a hydraulic pump, and a support.

[0007] The support includes a base plate, a left plate, a middle plate, and a right plate. The bottom of the left plate is connected to the top of the base plate, the bottom of the middle plate is connected to the top of the base plate, and the bottom of the right plate is connected to the top of the base plate. The left end of the drive sprocket is connected to the top of the left plate, and the middle section of the drive sprocket is connected to the top of the middle plate. A rotating disk is sleeved on the side of the drive sprocket near the middle plate. The drive sprocket and the rotating disk are coaxially connected. The rotating disk is located between the left plate and the middle plate. The right side of the drive sprocket is connected to the inner side of the gear plate. A linkage rod is inserted into the side of the rotating disk. The right end of the linkage rod contacts the outer teeth of the gear plate. A linkage rod pin is inserted into the front of the linkage rod. One end of the linkage rod pin passes through the linkage rod and connects to the rotating disk. A linkage rod spring is provided between the linkage rod and the drive sprocket. The right end of the gear plate is connected to the left end of the end shaft. The right end of the end shaft is connected to the left end of the coupling. The right end of the coupling is connected to the input end of the hydraulic pump. The hydraulic pump is mounted on the right plate by bolts.

[0008] A centrifugal assembly is provided on the top of the inner wall of the rotating disk, a locking rod is provided on the lower side of the rotating disk, and a centrifugal hammer spring is provided between the locking rod and the centrifugal assembly.

[0009] The hydraulic pump is connected to the oil tank through a pipeline, and the hydraulic pump is connected to the reversing control valve through two pipelines. The T port of the reversing control valve is connected to the oil tank, and the oil outlet of the reversing control valve is connected to the oil inlet of the hydraulic cylinder.

[0010] The hydraulic cylinder is equipped with a compression spring, and the output end of the hydraulic cylinder is connected to the brake pad mechanism. The working end of the brake pad mechanism holds the moving part.

[0011] The brake pad mechanism, compression spring, and hydraulic cylinder together form a safety brake.

[0012] The reversing control valve, oil tank, and hydraulic pump together form a power-driven safety protection and control device.

[0013] The gear disc, end shaft, and coupling constitute an overspeed clutch device.

[0014] The drive sprocket, rotating disk, linkage rod, linkage rod spring, centrifugal assembly, and linkage rod pin together form an inertial overspeed generator.

[0015] The drive sprocket includes a front end, a middle end, and a rear end. The right side of the front end is connected to the left side of the middle end, the right side of the middle end is connected to the left side of the rear end, the side of the middle end is connected to the inner side of the rotating disk, and the side of the rear end is connected to the inner side of the gear disk. A linkage rod spring is provided between the side of the middle end and the linkage rod.

[0016] The diameter of the front end is larger than that of the middle end, the diameter of the middle end is larger than that of the rear end, the side of the front end is connected to the drive chain, the front end is connected to the top of the left plate, the middle end is connected to the top of the middle plate, and the rear end is located between the middle plate and the right plate.

[0017] The centrifugal assembly includes a pulley, the top of which is connected to the top of the inner wall of the rotating disk, the side of which is connected to one end of a centrifugal rope, the other end of which is connected to the top of a centrifugal hammer, and the upper side of the centrifugal rope is connected to the other end of a linkage rod pin.

[0018] A retaining ring is installed on the side of the centrifugal hammer, and a centrifugal hammer spring is provided between the inner ring of the retaining ring and the retaining rod.

[0019] The hydraulic cylinder includes a cylinder chamber and a piston rod. An oil inlet is provided at the bottom of the cylinder chamber. A compression spring is provided inside the cylinder chamber. One end of the piston rod extends into the cylinder chamber and is connected to the compression spring. The other end of the piston rod is connected to the brake pad mechanism.

[0020] The left end of the front of the linkage rod is rotatably connected to a rotating shaft, and the end of the rotating shaft away from the linkage rod is connected to the bracket.

[0021] The linkage rod has a through hole on its front side. The linkage rod pin includes a connecting block, a rod, and a pad. The rod is inserted through the side of the connecting block. One end of the rod passes through the through hole and connects to the rotating disk. The other end of the rod passes through the connecting block and connects to the side of the pad.

[0022] The other side of the pad is connected to a handle, which is semi-circular in shape and connected to a centrifugal rope.

[0023] Multiple fixing screws are inserted into the side of the end shaft, and all fixing screws pass through the end shaft and connect to the gear plate.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. In a mechanical overspeed protection device of the present invention, the right side of the drive sprocket is connected to the inner side of the gear plate. A linkage rod is inserted into the side of the rotating plate, the right end of the linkage rod contacts the outer teeth of the gear plate, and a linkage rod pin is inserted into the front of the linkage rod. One end of the linkage rod pin passes through the linkage rod and connects to the rotating plate. A linkage rod spring is provided between the linkage rod and the drive sprocket. The right end of the gear plate is connected to the left end of the end shaft, the right end of the end shaft is connected to the left end of the coupling, and the right end of the coupling is connected to the input end of the hydraulic pump. The hydraulic pump is mounted on the right plate by bolts. The linkage rod pin is inserted into the linkage rod, so that the linkage rod is in a ready state. When the speed of the moving part exceeds the set value, the centrifugal force of the centrifugal assembly is greater than the tension of the centrifugal hammer spring. The centrifugal assembly will move outward and pull out the linkage rod pin. The linkage rod moves downward under the tension of the linkage rod spring. The mechanism triggers an overspeed action, causing the linkage rod to rotate the gear plate, end shaft, coupling, and drive sprocket together. This achieves the clutch action under overspeed conditions. When the coupling rotates, it drives the hydraulic pump to rotate and draws oil from the tank through a pipeline, generating hydraulic oil. This hydraulic oil then enters the pilot port of the directional control valve through two pipelines, causing the valve to switch. The pressure oil in the hydraulic cylinder's pressure chamber is released, and the compression spring resets, clamping the moving parts with the brake pad mechanism, thus braking them. This converts rotational force into hydraulic drive, enabling timely braking. The system automatically identifies the overspeed state of the lifting system mechanically and automatically transmits the power of the rotating parts to the hydraulic pump, providing reliable hydraulic power for the brake under large loads. This ensures timely braking and meets the safety protection requirements for overspeed braking of large equipment. Therefore, this design converts rotational force into hydraulic drive, making it safer to use.

[0026] 2. In this mechanical overspeed protection device, a rotating shaft is rotatably connected to the left end of the front of the linkage rod. The end of the rotating shaft away from the linkage rod is connected to a bracket. A through hole is provided on the front of the linkage rod. The linkage rod pin includes a connecting block, a plug rod, and a pad. The plug rod is inserted through the side of the connecting block. One end of the plug rod passes through the through hole and connects to the rotating disk, while the other end of the plug rod passes through the connecting block and connects to the side of the pad. The use of the rotating shaft makes the linkage rod move more smoothly when driven by the linkage rod spring, while also ensuring the stability of the linkage rod and avoiding unnecessary deviation during pulling. Therefore, this design is safe to use and stable in operation.

[0027] 3. In this mechanical overspeed protection device, the front of the linkage rod has a through hole. The linkage rod pin includes a connecting block, a rod, and a pad. The rod is inserted through the side of the connecting block. One end of the rod passes through the through hole and connects to the rotating disk, while the other end passes through the connecting block and connects to the side of the pad. A retaining ring is installed on the side of the centrifugal hammer. A centrifugal hammer spring is provided between the inner ring of the retaining ring and the retaining rod. The linkage rod pin and the centrifugal hammer spring can be fixed when the device is not in use, ensuring the stability of the equipment. Therefore, this design has strong stability and is simple to operate. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the connection structure between the drive sprocket and the rotating disk in this invention.

[0030] Figure 3 This is the present invention. Figure 2 Top view.

[0031] Figure 4 This is the present invention. Figure 2 Side view.

[0032] Figure 5 This is a schematic diagram of the linkage pin in this invention.

[0033] Figure 6 This is a schematic diagram of the safety brake in this invention.

[0034] Figure 7 This is a schematic diagram of the structure of the power-driven safety protection and control device in this invention.

[0035] Figure 8 This is a schematic diagram of the overspeed clutch device in this invention.

[0036] Figure 9 This is a schematic diagram of the inertial overspeed generator in this invention.

[0037] In the diagram: 1. Safety brake; 2. Power-driven safety protection control device; 3. Overspeed clutch device; 4. Inertial overspeed generator; 5. Brake pad mechanism; 5. Moving part; 51. Compression spring; 6. Hydraulic cylinder; 7. Cylinder chamber; 71. Oil inlet; 72. Piston rod; 73. Drive sprocket; 8. Front end; 81. Middle end; 82. Rear end; 83. Transmission chain; 84. Rotary disc; 9. Locking rod; 91. Linkage rod; 10. Linkage rod spring; 11. Gear disc; 12. End shaft; 13. Fixed... 131 Set screw, 14 Coupling, 15 Oil tank, 16 Centrifugal assembly, 161 Pulley, 162 Centrifugal rope, 163 Centrifugal hammer, 164 Snap ring, 17 Centrifugal hammer spring, 18 Linkage rod pin, 181 Connecting block, 182 Insert rod, 183 Pad, 184 Handle, 19 Reversing control valve, 20 Hydraulic pump, 201 First pipe, 202 Second pipe, 21 Bracket, 211 Base plate, 212 Left plate, 213 Middle plate, 214 Right plate. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] See Figures 1 to 9 A mechanical overspeed protection device, comprising a hydraulic cylinder 7, a drive sprocket 8, a rotating disk 9, a linkage rod 10, a centrifugal assembly 16, a hydraulic pump 20, and a bracket 21.

[0040] The support 21 includes a base plate 211, a left plate 212, a middle plate 213, and a right plate 214. The bottom of the left plate 212 is connected to the top of the base plate 211, the bottom of the middle plate 213 is connected to the top of the base plate 211, and the bottom of the right plate 214 is connected to the top of the base plate 211. The left end of the drive sprocket 8 is connected to the top of the left plate 212, and the middle section of the drive sprocket 8 is connected to the top of the middle plate 213. A rotating disk 9 is sleeved on the side of the drive sprocket 8 near the middle plate 213. The drive sprocket 8 and the rotating disk 9 are coaxially connected. The rotating disk 9 is located between the left plate 212 and the middle plate 213. The right side of the drive sprocket 8 is connected to the inner side of the gear plate 12. A linkage rod 10 is inserted into the side of the rotating disk 9. The right end of the linkage rod 10 contacts the outer teeth of the gear plate 12. A linkage rod pin 18 is inserted into the front of the linkage rod 10. One end of the linkage rod pin 18 passes through the linkage rod 10 and connects to the rotating disk 9. A linkage rod spring 11 is provided between the linkage rod 10 and the drive sprocket 8. The right end of the gear plate 12 is connected to the left end of the end shaft 13. The right end of the end shaft 13 is connected to the left end of the coupling 14. The right end of the coupling 14 is connected to the input end of the hydraulic pump 20. The hydraulic pump 20 is mounted on the right plate 214 by bolts.

[0041] The top of the inner wall of the rotating disk 9 is provided with a centrifugal assembly 16, and a locking rod 91 is provided at the lower side of the rotating disk 9. A centrifugal hammer spring 17 is provided between the locking rod 91 and the centrifugal assembly 16.

[0042] The hydraulic pump 20 is connected to the oil tank 15 through a pipe 201, and the hydraulic pump 20 is connected to the reversing control valve 19 through a second pipe 202. The T1 port of the reversing control valve 19 is connected to the oil tank 15, and the oil outlet of the reversing control valve 19 is connected to the oil inlet of the hydraulic cylinder 7.

[0043] The hydraulic cylinder 7 is equipped with a compression spring 6. The output end of the hydraulic cylinder 7 is connected to the brake pad mechanism 5. The working end of the brake pad mechanism 5 holds the moving part 51.

[0044] The brake pad mechanism 5, compression spring 6, and hydraulic cylinder 7 together form the safety brake 1;

[0045] The reversing control valve 19, oil tank 15, and hydraulic pump 20 constitute a power-driven safety protection and control device 2.

[0046] The gear disc 12, end shaft 13, and coupling 14 constitute the overspeed motion clutch device 3;

[0047] The drive sprocket 8, rotating disk 9, linkage rod 10, linkage rod spring 11, centrifugal assembly 16, and linkage rod pin 18 constitute the inertial overspeed generator 4.

[0048] The drive sprocket 8 includes a front end 81, a middle end 82, and a rear end 83. The right side of the front end 81 is connected to the left side of the middle end 82, the right side of the middle end 82 is connected to the left side of the rear end 83, the side of the middle end 82 is connected to the inner side of the rotating disk 9, and the side of the rear end 83 is connected to the inner side of the gear disk 12. A linkage spring 11 is provided between the side of the middle end 82 and the linkage rod 10.

[0049] The diameter of the front end 81 is larger than the diameter of the middle end 82, the diameter of the middle end 82 is larger than the diameter of the rear end 83, the side of the front end 81 is connected to the transmission chain 84, the front end 81 is connected to the top of the left plate 212, the middle end 82 is connected to the top of the middle plate 213, and the rear end 83 is located between the middle plate 213 and the right plate 214.

[0050] The centrifugal assembly 16 includes a pulley 161, the top of which is connected to the top of the inner wall of the rotating disk 9, the side of which is connected to one end of the centrifugal rope 162, the other end of which is connected to the top of the centrifugal hammer 163, and the upper side of the centrifugal rope 162 is connected to the other end of the linkage rod pin 18.

[0051] A retaining ring 164 is installed on the side of the centrifugal hammer 163, and a centrifugal hammer spring 17 is provided between the inner ring of the retaining ring 164 and the retaining rod 91.

[0052] The hydraulic cylinder 7 includes a cylinder chamber 71 and a piston rod 73. The bottom of the cylinder chamber 71 is provided with an oil inlet 72. A compression spring 6 is provided inside the cylinder chamber 71. One end of the piston rod 73 extends into the cylinder chamber 71 and is connected to the compression spring 6. The other end of the piston rod 73 is connected to the brake pad mechanism 5.

[0053] The left end of the front of the linkage rod 10 is rotatably connected to the rotating shaft 102, and the end of the rotating shaft 102 away from the linkage rod 10 is connected to the bracket 21.

[0054] The linkage rod 10 has a through hole 101 on its front side. The linkage rod pin 18 includes a connecting block 181, a rod 182, and a pad 183. The rod 182 is provided through the side of the connecting block 181. One end of the rod 182 passes through the through hole 101 and is connected to the rotating disk 9. The other end of the rod 182 passes through the connecting block 181 and is connected to the side of the pad 183.

[0055] The other side of the pad 183 is connected to the handle 184, which is semi-circular in shape and is connected to the centrifugal rope 162.

[0056] Multiple fixing screws 131 are inserted into the side of the end shaft 13, and all the fixing screws 131 pass through the end shaft 13 and are connected to the gear plate 12.

[0057] The principle of this invention is explained as follows: In the initial state, the linkage pin 18 is inserted into the linkage rod 10, so that the linkage rod 10 is in the preparatory state. When the speed of the moving part 51 exceeds the set value, the centrifugal force of the centrifugal hammer 163 is greater than the tension of the centrifugal hammer spring 17. The centrifugal hammer 163 will move outward and pull out the linkage pin 18. The linkage rod 10 moves downward under the tension of the linkage rod spring 11, thereby realizing overspeed triggering.

[0058] The gear disc 12 of the overspeed motion clutch device 3 is mounted on the drive sprocket 8 through a bushing. In the initial state, when the linkage rod 10 is triggered to move downward and engage in the tooth groove of the gear disc 12, the linkage rod 10 will drive the gear disc 12, the end shaft 13, the coupling 14 and the drive sprocket 8 to rotate together, thereby realizing the motion clutch action in the overspeed state.

[0059] Initially, the hydraulic pump 20 does not rotate. When the coupling 14 rotates, it will drive the hydraulic pump 20 to rotate and draw oil from the oil tank 15 through a pipe 201, thereby generating power hydraulic oil. The hydraulic oil will then enter the pilot port of the reversing control valve 19 through the second pipe 202, causing the reversing control valve 19 to switch.

[0060] The brake pad mechanism 5 of the safety brake 1 is pressured by the compression spring 6, thereby clamping the moving part 51. When the moving part 51 starts to run, pressurized oil is injected into the cylinder chamber 71 of the hydraulic cylinder 7, driving the piston rod 73 to squeeze the compression spring 6, so that the brake pad mechanism 5 is in the open state. When overspeed occurs, the reversing control valve 19 reverses, the cylinder chamber 71 of the hydraulic cylinder 7 is connected to the oil tank 15, the pressurized oil in the pressure chamber of the hydraulic cylinder 7 is released, the compression spring 6 is reset, and the brake pad mechanism 5 clamps the moving part 51, thereby braking the moving part 51.

[0061] Example 1:

[0062] A mechanical overspeed protection device includes a hydraulic cylinder 7, a drive sprocket 8, a rotating disk 9, a linkage rod 10, a centrifugal assembly 16, a hydraulic pump 20, and a support 21. The support 21 includes a base plate 211, a left plate 212, a middle plate 213, and a right plate 214. The bottom of the left plate 212 is connected to the top of the base plate 211, the bottom of the middle plate 213 is connected to the top of the base plate 211, and the bottom of the right plate 214 is connected to the top of the base plate 211. The left end of the drive sprocket 8 is connected to the top of the left plate 212, and the middle section of the drive sprocket 8 is connected to the top of the middle plate 213. A rotating disc 9 is sleeved on the side of the wheel 8 near the middle plate 213. The drive sprocket 8 is coaxially connected to the rotating disc 9. The rotating disc 9 is located between the left plate 212 and the middle plate 213. The right side of the drive sprocket 8 is connected to the inner side of the gear disc 12. A linkage rod 10 is inserted into the side of the rotating disc 9. The right end of the linkage rod 10 contacts the outer teeth of the gear disc 12. A linkage rod pin 18 is inserted into the front of the linkage rod 10. One end of the linkage rod pin 18 passes through the linkage rod 10 and connects to the rotating disc 9. A linkage rod spring 11 is provided between the linkage rod 10 and the drive sprocket 8. The right end of the gear disc 12 is connected to the left end of the end shaft 13. The right end of shaft 13 is connected to the left end of coupling 14, and the right end of coupling 14 is connected to the input end of hydraulic pump 20. Hydraulic pump 20 is bolted to right plate 214. Centrifugal assembly 16 is provided on the top of the inner wall of rotating disk 9, and a locking rod 91 is provided on the lower side of rotating disk 9. Centrifugal hammer spring 17 is provided between locking rod 91 and centrifugal assembly 16. Hydraulic pump 20 is connected to oil tank 15 through pipe 201, and hydraulic pump 20 is connected to reversing control valve 19 through two pipes 202. The T1 port of reversing control valve 19 is connected to oil tank 15, and the oil outlet of reversing control valve 19 is connected to the inlet of hydraulic cylinder 7. The oil end is connected; the hydraulic cylinder 7 is equipped with a compression spring 6, and the output end of the hydraulic cylinder 7 is connected to the brake pad mechanism 5. The working end of the brake pad mechanism 5 clamps the moving part 51; the brake pad mechanism 5, the compression spring 6, and the hydraulic cylinder 7 form a safety brake 1; the reversing control valve 19, the oil tank 15, and the hydraulic pump 20 form a power-driven safety protection control device 2; the gear plate 12, the end shaft 13, and the coupling 14 form an overspeed motion clutch device 3; the drive sprocket 8, the rotating disk 9, the linkage rod 10, the linkage rod spring 11, the centrifugal assembly 16, and the linkage rod pin 18 form an inertial overspeed generator 4.

[0063] In application: In the initial state, the linkage pin 18 is inserted into the linkage 10, so that the linkage 10 is in the ready state. When the speed of the moving part 51 exceeds the set value, the centrifugal force of the centrifugal assembly 16 is greater than the tension of the centrifugal hammer spring 17. The centrifugal assembly 16 will move outward and pull out the linkage pin 18. The linkage 10 moves downward under the tension of the linkage spring 11, thereby realizing overspeed triggering.

[0064] In the initial state, when the linkage rod 10 is triggered to move downward and engage in the tooth groove of the gear plate 12, the linkage rod 10 will drive the gear plate 12, the end shaft 13, the coupling 14 and the drive sprocket 8 to rotate together, thereby realizing the motion clutch action in the overspeed state;

[0065] Initially, the hydraulic pump 20 does not rotate. When the coupling 14 rotates, it will drive the hydraulic pump 20 to rotate and draw oil from the oil tank 15 through a pipe 201, thereby generating power hydraulic oil. The hydraulic oil will then enter the pilot port of the reversing control valve 19 through the second pipe 202, causing the reversing control valve 19 to switch.

[0066] The brake pad mechanism 5 of the safety brake 1 is pressured by the compression spring 6 to clamp the moving part 51. When the moving part 51 starts to run, pressurized oil is injected into the hydraulic cylinder 7 to open the brake pad mechanism 5. When overspeed occurs, the reversing control valve 19 reverses, the hydraulic cylinder 7 is connected to the oil tank 15, the pressurized oil in the pressure chamber of the hydraulic cylinder 7 is released, and the hydraulic cylinder 7 resets to clamp the moving part 51 with the brake pad mechanism 5, thereby braking the moving part 51.

[0067] Example 2:

[0068] Example 2 is basically the same as Example 1, except that:

[0069] A mechanical overspeed protection device includes a drive sprocket 8 comprising a front end 81, a middle end 82, and a rear end 83. The right side of the front end 81 is connected to the left side of the middle end 82, and the right side of the middle end 82 is connected to the left side of the rear end 83. The side of the middle end 82 is connected to the inner side of the rotating disk 9, and the side of the rear end 83 is connected to the inner side of the gear disk 12. A linkage spring 11 is provided between the side of the middle end 82 and the linkage rod 10. The diameter of the front end 81 is larger than the diameter of the middle end 82, and the diameter of the middle end 82 is larger than the diameter of the rear end 83. The side of the front end 81 is connected to the transmission chain 84. The front end 81 is connected to the top of the left plate 212, and the middle end 82 is connected to the top of the middle plate 213. The rear end 83 is located between the middle plate 213 and the right plate 214.

[0070] Example 3:

[0071] Example 3 is basically the same as Example 1, except that:

[0072] A mechanical overspeed protection device, wherein the centrifugal assembly 16 includes a pulley 161, the top of which is connected to the top of the inner wall of the rotating disk 9, the side of which is connected to one end of a centrifugal rope 162, the other end of which is connected to the top of a centrifugal hammer 163, and the upper side of the centrifugal rope 162 is connected to the other end of a linkage rod pin 18; a retaining ring 164 is installed on the side of the centrifugal hammer 163, and a centrifugal hammer spring 17 is provided between the inner ring of the retaining ring 164 and the retaining rod 91.

[0073] Example 4:

[0074] Example 4 is basically the same as Example 1, except that:

[0075] A mechanical overspeed protection device, wherein the hydraulic cylinder 7 includes a cylinder chamber 71 and a piston rod 73. The bottom of the cylinder chamber 71 is provided with an oil inlet 72. A compression spring 6 is provided inside the cylinder chamber 71. One end of the piston rod 73 extends into the cylinder chamber 71 and is connected to the compression spring 6. The other end of the piston rod 73 is connected to the brake pad mechanism 5.

[0076] Example 5:

[0077] Example 5 is basically the same as Example 1, except that:

[0078] A mechanical overspeed protection device includes a linkage rod 10 with a rotating shaft 102 rotatably connected to its left front end. The end of the rotating shaft 102 away from the linkage rod 10 is connected to a bracket 21. A through hole 101 is provided on the front of the linkage rod 10. The linkage rod pin 18 includes a connecting block 181, a rod 182, and a pad 183. The rod 182 is inserted through the side of the connecting block 181. One end of the rod 182 passes through the through hole 101 and is connected to a rotating disk 9. The other end of the rod 182 passes through the connecting block 181 and is connected to the side of the pad 183. The other side of the pad 183 is connected to a handle 184, which is semi-circular in shape and is connected to a centrifugal rope 162. Multiple fixing screws 131 are inserted into the side of the end shaft 13, and all the fixing screws 131 pass through the end shaft 13 and are connected to the gear plate 12.

[0079] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A mechanical overspeed protection device, characterized in that The mechanical overspeed protection device comprises a hydraulic cylinder (7), a drive sprocket (8), a rotating disc (9), a linkage rod (10), a centrifugal assembly (16), a hydraulic pump (20) and a bracket (21); The bracket (21) comprises a bottom plate (211), a left plate (212), a middle plate (213) and a right plate (214). The bottom of the left plate (212) is connected to the top of the bottom plate (211), the bottom of the middle plate (213) is connected to the top of the bottom plate (211), and the bottom of the right plate (214) is connected to the top of the bottom plate (211). The left end of the drive sprocket (8) is connected to the top of the left plate (212), the middle section of the drive sprocket (8) is connected to the top of the middle plate (213), and the rotating disc (9) is sleeved on the side wall of the drive sprocket (8) near the middle plate (213). The drive sprocket (8) is coaxially connected with the rotating disc (9), the rotating disc (9) is arranged between the left plate (212) and the middle plate (213), the right end of the drive sprocket (8) is connected to the inner wall of the gear disc (12), the linkage rod (10) is inserted into the side wall of the rotating disc (9), the right end of the linkage rod (10) is in contact with the outer gear of the gear disc (12), the linkage rod (10) is inserted with the linkage rod pin (18) on the front side, one end of the linkage rod pin (18) penetrates through the linkage rod (10) and is connected to the rotating disc (9), the linkage rod (10) is provided with the linkage rod spring (11) between the drive sprocket (8), the right end of the gear disc (12) is connected to the left end of the end shaft (13), the right end of the end shaft (13) is connected to the left end of the shaft coupling (14), the right end of the shaft coupling (14) is connected to the input end of the hydraulic pump (20), and the hydraulic pump (20) is arranged on the right plate (214) through bolts; The inner wall of the rotating disc (9) is provided with the centrifugal assembly (16), and the side wall of the rotating disc (9) is provided with the clamping rod (91). The centrifugal hammer spring (17) is arranged between the clamping rod (91) and the centrifugal assembly (16); The hydraulic pump (20) is connected to the oil tank (15) through a pipeline (201), the hydraulic pump (20) is connected to the reversing control valve (19) through a pipeline (202), the T1 port of the reversing control valve (19) is communicated with the oil tank (15), and the oil outlet of the reversing control valve (19) is communicated with the oil inlet of the hydraulic cylinder (7); The hydraulic cylinder (7) is provided with the compression spring (6), and the output end of the hydraulic cylinder (7) is connected to the brake piece mechanism (5). The working end of the brake piece mechanism (5) clamps the moving part (51); The brake piece mechanism (5), the compression spring (6) and the hydraulic cylinder (7) constitute the safety brake (1); The reversing control valve (19), the oil tank (15) and the hydraulic pump (20) constitute the power-driven safety protection control device (2); The gear disc (12), the end shaft (13) and the shaft coupling (14) constitute the overspeed motion clutch device (3); The drive sprocket (8), the rotating disc (9), the linkage rod (10), the linkage rod spring (11), the centrifugal assembly (16) and the linkage rod pin (18) constitute the inertial overspeed generator (4).

2. A mechanical overspeed protection device according to claim 1, characterized in that: The driving chain wheel (8) comprises a front end (81), a middle end (82) and a rear end (83), the right side of the front end (81) is connected with the left side of the middle end (82), the right side of the middle end (82) is connected with the left side of the rear end (83), the side wall of the middle end (82) is connected with the inner wall of the rotating disc (9), the side wall of the rear end (83) is connected with the inner wall of the gear disc (12), and the side wall of the middle end (82) is provided with a linkage rod spring (11) between the linkage rod (10).

3. A mechanical overspeed protection device according to claim 2, characterized in that: The diameter of the front end (81) is greater than that of the middle end (82), the diameter of the middle end (82) is greater than that of the rear end (83), the side wall of the front end (81) is connected with the transmission chain (84), the top of the front end (81) is connected with the left plate (212), the top of the middle end (82) is connected with the middle plate (213), and the rear end (83) is located between the middle plate (213) and the right plate (214).

4. A mechanical overspeed protection device according to claim 1, characterized in that: The centrifugal assembly (16) comprises a pulley (161), the top of the pulley (161) is connected with the top of the inner wall of the rotating disc (9), the side wall of the pulley (161) is connected with one end of a centrifugal rope (162), the other end of the centrifugal rope (162) is connected with the top of a centrifugal hammer (16), and the upper end side of the centrifugal rope (162) is connected with the other end of a linkage rod bolt (18).

5. A mechanical overspeed protection device according to claim 4, characterised in that: The centrifugal hammer (16) is provided with a snap ring (164) on the side wall, and the inner ring of the snap ring (164) is provided with a centrifugal hammer spring (17) between the snap rod (91).

6. A mechanical overspeed protection device according to claim 1, characterized in that: The hydraulic cylinder (7) comprises a cylinder cavity (71) and a piston rod (73), the bottom of the cylinder cavity (71) is provided with an oil inlet (72), the inside of the cylinder cavity (71) is provided with a compression spring (6), one end of the piston rod (73) extends to the cylinder cavity (71) and is connected with the compression spring (6), and the other end of the piston rod (73) is connected with a brake piece mechanism (5).

7. A mechanical overspeed protection device according to claim 4, characterized in that: The front left end of the linkage rod (10) is rotatably connected with a rotating shaft (102), and the end of the rotating shaft (102) away from the linkage rod (10) is connected with a support (21).

8. A mechanical overspeed protection device according to claim 7, characterised in that: The front surface of the linkage rod (10) is provided with a through hole (101), and the linkage rod bolt (18) comprises a connecting block (181), a plug rod (182) and a backing plate (183), the plug rod (182) is provided on the side wall of the connecting block (181) in a penetrating manner, one end of the plug rod (182) penetrates the through hole (101) and is connected with the rotating disc (9), and the other end of the plug rod (182) penetrates the connecting block (181) and is connected with the side wall of the backing plate (183).

9. A mechanical overspeed protection device according to claim 8, characterised in that: The other side of the backing plate (183) is connected with a handle (184), the handle (184) is in a semicircular shape, and the handle (184) is connected with the centrifugal rope (162).

10. A mechanical overspeed protection device according to claim 1, characterized in that: The side wall of the end shaft (13) is inserted with a plurality of fixing screws (131), and all the fixing screws (131) penetrate the end shaft (13) and are connected with the gear disc (12).

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