Testing tool for overspeed protection device of monorail hoist

Abstract

A testing tool for an overspeed protection device of a monorail hoist belongs to the technical field of equipment detection and comprises a support, a first handle is fixedly arranged at one end of the support, a driving shaft is rotatably arranged in the support and connected with a hand-cranking assembly through a gear assembly, and one end, away from the first handle, of the driving shaft extends out of the support and is detachably provided with a connector. The connector is detachably connected with the driving unit, different driving units can be conveniently replaced according to different testing requirements, the universality and flexibility of the testing tool are improved, the driving unit is of a T-shaped structure and can be matched with a linear clamping groove in a triggering mechanism of the overspeed protection device, then the triggering mechanism is driven to rotate in a hand-cranking mode, and the testing efficiency is improved. The testing tool is simple in overall structure, small in size, light in weight and convenient to carry and use, does not need to be connected with a power source, an air source and the like, is high in adaptability, does not need to lay pipelines and the like, can perform testing work at any underground place, and effectively improves the detection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of equipment testing technology, and in particular to a testing tool for a monorail crane overspeed protection device. Background Technology

[0002] Overspeed protection is a safety protection device for monorail locomotives. The triggering mechanism of the overspeed protection device is a cylindrical device with a diameter of 0.1 meters. It interacts with the monorail track through friction. When the locomotive is running normally, the triggering mechanism rotates accordingly. When the speed of the monorail locomotive exceeds the set value, the centrifugal force will cause the swinging component in the overspeed protection device to swing. The swinging component will squeeze related parts, such as the pop-out pin, causing it to pop out from the pop-out hole, thereby triggering the triggering element, and finally triggering the pneumatic valve or other braking device of the braking locomotive to achieve braking.

[0003] To ensure construction safety, overspeed protection performance testing must be conducted annually. When testing the overspeed protection device underground, due to explosion-proof requirements, a pneumatic rotating tool is generally used. During testing, the overspeed protection device is erected and rotated using the pneumatic rotating tool. When the overspeed protection device trigger mechanism reaches its operating speed, the overspeed protection device activates.

[0004] The existing overspeed protection test uses a pneumatic actuator, which is large and heavy, making it inconvenient to carry. When used underground, it is limited by the air pressure source and can only be tested at the location where the air pressure source is located. In addition, the pneumatic actuator needs to be connected to the air pressure source by pipeline. At the same time, it is necessary to ensure that no other air-using units are using it during the test. The on-site operation is very limited and inconvenient to use. Utility Model Content

[0005] To address the technical problems in the existing overspeed protection testing methods described above, which use pneumatic actuators that are limited by the air pressure source and are bulky and heavy, making them inconvenient to carry and use, this utility model provides a testing tool for overspeed protection devices on monorail cranes.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a testing tool for a monorail crane overspeed protection device, including a bracket. A first handle is fixedly mounted on one end of the bracket, providing a stable operating support point and making it easier for the operator to grip the bracket. A drive shaft is rotatably mounted inside the bracket, connected to a hand crank assembly via a gear assembly. The power from the hand crank is transmitted to the drive shaft, controlling its rotation. The end of the drive shaft away from the first handle extends outward from the bracket and is detachably fitted with a connector. This connector is detachably connected to a drive unit, allowing for easy replacement of different drive units to meet varying testing needs, thus improving the versatility and flexibility of the testing tool. The drive unit has a T-shaped structure, which engages with a slot on the overspeed protection device's trigger mechanism, driving the trigger mechanism's rotation via hand cranking. The testing tool has a simple overall structure, is small in size and lightweight, making it easy to carry and use. Furthermore, the tool requires no power or air supply, meeting explosion-proof requirements. It is highly adaptable, requiring no piping, and can be used for testing at any location underground, effectively improving testing efficiency.

[0008] Preferably, the drive unit includes a rod-shaped drive part and a mounting part. The axis of the drive part is perpendicular to that of the mounting part. Both ends of the drive part are ball ends, which can reduce friction when connected with the triggering mechanism and make the connection tighter and more stable.

[0009] Preferably, the gear assembly includes a meshing driving bevel gear and a driven bevel gear. The driving bevel gear is rotatably mounted on the bracket and is fixedly connected to the hand crank assembly. The driven bevel gear is fixedly mounted on the drive shaft. The driving bevel gear is located on one side of the drive shaft and can change the direction of power transmission, so that the power of the hand crank assembly is transmitted to the drive shaft. Moreover, the transmission ratio of the bevel gear is stable, which can achieve relatively accurate speed control and meet the speed requirements of different test conditions.

[0010] Preferably, there is one or two driven bevel gears. When there is one driven bevel gear, the structure is simple and easy to install and maintain. When there are two driven bevel gears, the stability and reliability of the transmission can be increased. At the same time, when transmitting large torque, the load can be better distributed, avoiding damage to a single driven bevel gear due to excessive force. This is suitable for test scenarios with high torque requirements and improves the applicability of the test tool.

[0011] Preferably, the bracket is a frame structure, with a connecting part fixedly provided in the middle of the bracket, and support parts fixedly connected to both ends of the connecting part. The support parts are also fixedly connected to the bracket. The drive shaft passes through the connecting part and the support parts, and the active bevel gear is connected to the connecting part through a rotating shaft. The setting of the connecting part and the support parts can not only enhance the structural strength of the bracket, but also support and protect the drive shaft through the connecting part and the support parts, thereby improving the service life of the drive shaft.

[0012] Preferably, the hand crank assembly includes a rocker arm, one end of which is fixedly connected to the drive bevel gear, and the other end of which is rotatably connected to a second handle. This increases the lever arm that the operator can apply to the hand crank assembly. According to the lever principle, the operator can drive the drive bevel gear to rotate with a smaller force, thus reducing the labor intensity of the operation.

[0013] As can be seen from the above technical solutions, the advantages of this utility model are:

[0014] 1. The fixed first handle makes it easier for operators to hold the bracket and provides a stable operating support point. The T-shaped drive unit is used to connect with the trigger mechanism of the overspeed protection device. It can make the trigger mechanism rotate around the axis under the drive shaft. The rotation of the trigger mechanism is driven by hand. The test tool has a simple overall structure, small size, light weight, and is easy to carry and use. The test tool does not need to be connected to a power source or air source, meets explosion-proof requirements, has strong adaptability, does not require the laying of pipelines, and can be used for testing at any location underground, effectively improving the testing efficiency.

[0015] 2. The T-shaped drive unit can cooperate with the slot on the overspeed protection device trigger mechanism, thereby driving the rotation of the trigger mechanism by hand. The ball end of the drive unit can reduce friction when connected to the trigger mechanism, and at the same time make the connection tighter and more stable.

[0016] 3. A connecting part is fixedly provided in the middle of the bracket, and support parts are fixedly connected to both ends of the connecting part. The setting of the connecting part and the support part can not only enhance the structural strength of the bracket, but also support and protect the drive shaft through the connecting part and the support part, thereby improving the service life of the drive shaft. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the test tool for the monorail crane overspeed protection device according to one or more embodiments of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of an overspeed protection device in the prior art;

[0020] The components represented by the various reference numerals in the diagram are:

[0021] 1. Bracket; 2. First handle; 3. Drive shaft; 4. Connector; 5. Drive unit; 6. Connecting part; 7. Support part; 8. Driving bevel gear; 9. Driven bevel gear; 10. Rocker arm; 11. Second handle; 12. Ball end. Detailed Implementation

[0022] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0023] In a typical embodiment of this utility model, such as Figure 1 As shown, a test tool for a monorail crane overspeed protection device is proposed, comprising: a bracket 1, a first handle 2, a drive shaft 3, a connector 4, and a drive unit 5. The first handle 2 is fixedly installed at one end of the bracket 1. The drive shaft 3 is rotatably disposed inside the bracket 1, with the end of the drive shaft 3 away from the first handle 2 extending outward from the bracket 1. The connector 4 is detachably installed on the end of the drive shaft 3 extending outward from the bracket 1. The drive unit 5 is detachably connected to the connector 4. The drive unit 5 is used to connect to the triggering mechanism of the overspeed protection device and to drive the triggering mechanism to rotate around the shaft. The drive shaft 3 is connected to a hand crank assembly through a gear assembly, so that the drive shaft 3 can be controlled to rotate around the shaft by hand cranking, thereby driving the drive unit 5 to rotate around the shaft.

[0024] Specifically, the gear assembly includes a driving bevel gear 8 and a driven bevel gear 9. The driving bevel gear 8 is rotatably mounted on the bracket 1 via a rotating shaft, and the driven bevel gear 9 is fixedly mounted on the drive shaft 3. The driven bevel gear 9 and the drive shaft 3 are coaxially arranged. The driving bevel gear 8 has a disc structure and is located on one side of the drive shaft 3. The driving bevel gear 8 meshes with the driven bevel gear 9, and the center of the driving bevel gear 8 is also fixedly connected to the hand crank assembly. Thus, the hand crank assembly can drive the driving bevel gear 8 to rotate around the shaft, and then the driving bevel gear 8 can drive the driven bevel gear 9 to rotate around the shaft, thereby driving the drive shaft 3 and the connector 4 and drive unit 5 on the drive shaft 3 to rotate synchronously around the shaft, driving the trigger mechanism to rotate.

[0025] One driven bevel gear 9 can be provided, or two can be provided. Providing one driven bevel gear 9 can simplify the complexity of the overall structure. When two are provided, the two driven bevel gears 9 are symmetrically fixed on the drive shaft 3, and the driving bevel gear 8 meshes with the two driven bevel gears 9 respectively. The two driven bevel gears 9 can improve the load-bearing capacity and the smoothness of the drive, and avoid phenomena such as swaying.

[0026] Understandably, in actual use, the number of driven bevel gears 9 can be selected according to actual needs, and no further restrictions are imposed here.

[0027] The bracket 1 has a frame structure. A connecting part 6 is fixedly provided in the middle of the bracket 1. Support parts 7 are fixedly connected to both ends of the connecting part 6. The support parts 7 are also fixedly connected to the bracket 1. Both the connecting part 6 and the support parts 7 are hollow structures. The drive shaft 3 passes through the connecting part 6 and the support parts 7 to support and protect the drive shaft 3, thereby improving the service life of the drive shaft 3. The drive shaft 3 and the bracket 1 are rotatably connected by bearings. The active bevel gear 8 is connected to the connecting part 6 through a rotating shaft.

[0028] The hand crank assembly includes a rocker arm 10 and a second handle 11. One end of the rocker arm 10 is fixedly connected to the center of the drive bevel gear 8 by bolts, and the other end of the rocker arm 10 is rotatably connected to the second handle 11 so as to drive the drive bevel gear 8 to rotate around the axis using the rocker arm 10.

[0029] The axis of the second handle 11 is perpendicular to the axis of the first handle 2. In actual use, the position of the test tool can be restricted by gripping the first handle 2, and the rocker arm 10 can be driven by the second handle 11 to control the rotation of the drive unit 5. It is convenient to use. It should be noted that in order to facilitate the operation of the rocker arm 10, the first handle 2 needs to be fixedly connected to the bracket 1. In order to improve the stability of handheld use, both the first handle 2 and the second handle 11 are equipped with anti-slip sleeves.

[0030] The drive shaft 3 has an external thread at one end extending from the bracket 1, and the connector 4 has an internal thread. The connector 4 is detachably connected to the drive shaft 3 by means of threaded connection. The connector 4 is an existing quick clamping structure that can clamp and fix the drive unit 5.

[0031] like Figure 2 As shown, the existing overspeed protection device has a straight slot at the center of the trigger mechanism. In this embodiment, the drive unit 5 is set as a T-shaped structure. Specifically, the drive unit 5 includes a rod-shaped drive part and a mounting part. The mounting part is used to connect with the connector 4. The center of the drive part is fixedly set at one end of the mounting part. The axis of the drive part is perpendicular to the axis of the mounting part. Both ends of the drive part are ball ends 12, that is, both ends of the drive part are hemispherical structures, so that the drive part can be inserted into the straight slot.

[0032] The testing tool in this embodiment has a simple overall structure, small size, and light weight, making it easy to carry and use. Furthermore, the testing tool does not require connection to a power source or gas source, meets explosion-proof requirements, has strong adaptability, and does not require the laying of pipelines. It can be used to conduct testing work at any location underground, effectively improving detection efficiency.

[0033] The specific working principle is as follows:

[0034] Select a drive unit 5 of appropriate size, connect the drive unit 5 to the connector 4, and install the drive unit 5 and the connector 4 together on the drive shaft 3;

[0035] Erect the overspeed protection device, ensuring it does not contact the monorail track during rotation. Insert the drive unit 5 into the slot of the trigger mechanism. Hold the first handle 2 with one hand, keeping the testing tool perpendicular to the trigger mechanism to prevent the speed from failing to reach the trigger speed due to instability. Hold the second handle 11 with the other hand and shake the rocker arm 10. This drives the driven bevel gear 9 through the active bevel gear 8, which in turn drives the drive shaft 3 to rotate around the shaft. The drive unit 5 drives the trigger mechanism to rotate. Use a tachometer to measure the rotation speed, keeping the tachometer perpendicular to the reflective foil on the trigger mechanism to ensure accurate and stable data. Read the tachometer data promptly when the trigger mechanism throws out the block. Calculate the linear velocity of the trigger mechanism using the circumference formula to determine the speed at which the block is thrown out. After the block is thrown out and collides with the pressure relief valve, observe whether the locomotive stops and brakes, and record the braking time and braking distance. Calculate whether the braking distance meets the standard requirements.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test tool for a monorail hoist overspeed protection device, comprising: Support (1), characterized in that one end of the support (1) is fixedly provided with a first handle (2), a driving shaft (3) is rotatably arranged in the support (1), the driving shaft (3) is connected with a hand shaking assembly through a gear assembly, one end of the driving shaft (3) away from the first handle (2) extends out of the support (1) and is detachably provided with a connecting head (4), the connecting head (4) is detachably connected with a driving unit (5), and the driving unit (5) is in a T-shaped structure.

2. The monorail hoist overspeed protection device testing tool of claim 1, wherein, The driving unit (5) comprises a rod-shaped driving part and a mounting part, the axis of the driving part is perpendicular to the axis of the mounting part, and both ends of the driving part are spherical ends (12).

3. The monorail hoist overspeed protection device testing tool of claim 1, wherein, The gear assembly comprises a driving bevel gear (8) and a driven bevel gear (9) in meshing engagement, the driving bevel gear (8) is rotatably arranged on the support (1), the driving bevel gear (8) is fixedly connected with the hand shaking assembly, the driven bevel gear (9) is fixedly arranged on the driving shaft (3), and the driving bevel gear (8) is located on one side of the driving shaft (3).

4. The monorail hoist overspeed protection device testing tool of claim 3, wherein, The driven bevel gear (9) is provided with one or two.

5. The monorail hoist overspeed protection device testing tool of claim 3, wherein, The support (1) is in a frame structure, a connecting part (6) is fixedly arranged at the middle position of the support (1), support parts (7) are fixedly connected at both ends of the connecting part (6), the support parts (7) are also fixedly connected with the support (1), the driving shaft (3) passes through the connecting part (6) and the support parts (7), and the driving bevel gear (8) is connected with the connecting part (6) through a rotating shaft.

6. The monorail hoist overspeed protection device testing tool of claim 3, wherein, The hand shaking assembly comprises a rocker arm (10), one end of the rocker arm (10) is fixedly connected with the driving bevel gear (8), and the other end of the rocker arm (10) is rotatably connected with a second handle (11).

Images