A device for detecting the clearance of a brake shoe of an elevator

Abstract

The utility model discloses a kind of hoist brake shoe gap detection devices, it is related to brake shoe detection field, including mounting seat, bolt is threadedly connected on the mounting seat, the end portion of the bolt is rotatably connected with contraction component, and the movable end of contraction component is fixedly connected with mounting bracket, laser displacement sensor is rotatably connected on the mounting bracket, water bubble level is fixedly connected on the laser displacement sensor.Achieve position accurate control by bolt adjustment and contraction component fine adjustment cooperation, bolt can adjust the length of extension and drive component close to brake shoe, piston is further fine adjustment distance along sleeve sliding, and sensor emission end is flush with mounting bracket end portion, when mounting bracket contacts brake disc, emission end is flush with brake shoe directly, avoid the detection error caused by position deviation from structure, guarantee data accurate.

Description

Technical Field

[0001] This utility model relates to the field of brake shoe detection technology, specifically to a device for detecting the gap between brake shoes of a hoist. Background Technology

[0002] As a core piece of equipment in mining, construction, and logistics industries for vertical or inclined material and personnel transport, the reliability of the braking system of a hoist directly determines operational safety. The clearance between the brake shoes and the brake wheel, typically required to be 0.5-2mm, is a critical parameter for the braking system. Too small a clearance can easily lead to abnormal friction between the brake shoes and the brake wheel, causing overheating and wear of components, and reduced braking efficiency. Too large a clearance will prolong the braking response time, and in extreme cases, may lead to brake failure and safety accidents.

[0003] Existing hoist brake shoe gap detection technology is difficult to accurately locate, making it difficult for the laser displacement sensor transmitter to be precisely aligned with the brake shoe. The detection data is prone to deviation due to positional offset. The calibration operation is complex and relies on external tools such as spirit levels and angle gauges. The calibration process requires multiple people to work together and is time-consuming. Especially in complex environments such as underground mines and construction sites, the operation difficulty is further increased, affecting the detection efficiency.

[0004] Furthermore, maintaining the flush position of the sensor's detection end with the brake shoe over a long period is difficult. Brake shoes gradually wear down during prolonged use, and existing devices cannot dynamically adapt to these wear changes using a simple structure. If the sensor position is not readjusted in time, the deviation between the detected data and the actual clearance will increase, failing to accurately reflect the braking system's condition and creating a safety hazard. Utility Model Content

[0005] The purpose of this invention is to provide a hoist brake shoe clearance detection device to solve the above-mentioned problems, as detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This utility model provides a hoist brake shoe gap detection device, including a mounting base, a bolt threadedly connected to the mounting base, a shrinkage component rotatably connected to the end of the bolt, and a mounting bracket fixedly connected to the movable end of the shrinkage component. A laser displacement sensor is rotatably connected to the mounting bracket, and a bubble level is fixedly connected to the laser displacement sensor.

[0008] The above-mentioned hoist brake shoe gap detection device is used to fix the mounting base on the hoist brake shoe bracket, ensuring that the mounting base and the brake shoe bracket are firmly connected, serving as the fixed reference for the entire device.

[0009] By using the hexagonal groove at the end of the bolt and rotating the bolt with a wrench, the length of the bolt extending out of the mounting seat is adjusted by utilizing the threaded engagement between the bolt and the mounting base, which initially moves the retraction assembly and mounting bracket closer to the brake shoe position.

[0010] Then, put the braking system into braking mode. At this time, the brake shoes will contact the end face of the brake disc. By rotating the bolts, make the mounting bracket contact the brake disc. At this time, the laser emitter end will be flush with the brake shoes. After releasing the brake, observe the bubble level on the laser displacement sensor until the bubble level is centered to complete the horizontal calibration. At this time, the laser displacement sensor will be perpendicular to the end face of the brake disc, and the laser displacement sensor can measure the gap between the brake shoes and the brake disc.

[0011] When the brake shoe wears down after long-term use, causing its surface position to change, the piston of the retraction assembly drives the laser displacement sensor to move synchronously until the emitting end is flush with the worn brake shoe surface again.

[0012] Preferably, the shrinkage assembly includes a sleeve, which is rotatably connected to the end of the bolt via a pin. A piston is slidably connected inside the sleeve, and a mounting bracket is fixedly connected to the piston. One-way valve one and one-way valve two are fixedly connected to the sleeve, and the check direction of one-way valve two is opposite to that of one-way valve one. The axial directions of the sleeve, pin, and bolt are consistent.

[0013] Preferably, a first damping element is provided between the sleeve and the bolt to improve the rotational damping of the sleeve.

[0014] Preferably, the first damping element includes a spring fixedly connected to the end of the sleeve, and a friction washer fixedly connected to the other end of the spring, which contacts the end of the bolt. A guide rod is slidably connected inside the sleeve, and the guide rod is fixedly connected to the friction washer, and the guide rod does not penetrate into the cavity between the sleeve and the piston.

[0015] Preferably, a locking assembly is fixedly connected to the mounting base for supporting the bolts.

[0016] Preferably, the locking assembly includes a fixing plate fixedly connected to the mounting base, a screw threadedly connected to the fixing plate, a top plate rotatably connected to the end of the screw, and a friction pad that contacts the surface of the bolt fixedly connected to the top plate.

[0017] Preferably, the nut end of the bolt has a hexagonal groove.

[0018] Preferably, a rotating shaft is fixedly connected to the laser displacement sensor, and the rotating shaft is rotatably connected to the mounting bracket. The emitting end of the laser displacement sensor is flush with the end of the mounting bracket away from the bolt.

[0019] Preferably, the rotating shaft is provided with a second damping element to improve the rotational damping of the rotating shaft.

[0020] Preferably, the second damping component includes a retaining ring fixedly connected to the end of the rotating shaft, a sliding groove is provided on the rotating shaft, and a slider is slidably connected in the sliding groove. A second friction washer is slidably connected to the surface of the rotating shaft, and the second friction washer is fixedly connected to the slider. A second spring is sleeved on the surface of the rotating shaft, and the two ends of the second spring are fixedly connected to the second friction washer and the retaining ring respectively. The second friction washer is in contact with the surface plane of the mounting bracket.

[0021] The beneficial effects are:

[0022] 1. Precise position control is achieved through the combination of bolt adjustment and shrinkage assembly fine adjustment. The bolt can be adjusted to extend its length to move the component closer to the brake shoe. The piston slides along the sleeve to further fine adjust the distance. The sensor transmitter end is flush with the end of the mounting bracket. When the mounting bracket contacts the brake disc, the transmitter end is directly flush with the brake shoe. This structure avoids detection errors caused by positional deviation and ensures data accuracy.

[0023] 2. Integrated bubble level, allowing for intuitive judgment of levelness without additional tools. A single person can complete position and level calibration by adjusting bolts and pushing pistons with a wrench, enabling efficient operation even in complex environments such as mines and construction sites.

[0024] 3. The piston of the shrinking component can drive the sensor to move synchronously with the wear of the brake shoe, quickly restoring the transmitter end to the flush state with the brake shoe. Through the flexible structure design, the squeezing deformation problem caused by the rigid connection between the mounting bracket and the bolt is avoided. In addition, the first and second damping components provide rotational and angular damping to resist the vibration of the hoist and avoid positional deviation. Frequent calibration is not required, ensuring long-term detection accuracy and eliminating safety hazards.

[0025] 4. Stability is enhanced through multiple structures. The first damping component prevents the sleeve from rotating, the second damping component prevents the sensor angle from shifting, and the screw of the locking assembly pushes the friction pad to tighten the bolt to prevent loosening. The multiple damping and locking designs work together to resist the vibration of the hoist, ensuring the long-term stability of the detection position and further guaranteeing the reliability of the detection. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a front view structural diagram of the present invention;

[0029] Figure 3 This is a three-dimensional structural diagram of the mounting bracket of this utility model;

[0030] Figure 4 This is a schematic diagram of the three-dimensional structure of the bolt of this utility model;

[0031] Figure 5 This is a schematic diagram of the three-dimensional structure of the sleeve of this utility model.

[0032] The annotations in the attached figures are explained as follows:

[0033] 1. Mounting base; 2. Bolt; 3. Locking assembly; 4. Hexagonal groove; 5. Fixing plate; 6. Screw; 7. Friction pad; 8. Top plate; 9. Retraction assembly; 10. Piston; 11. Sleeve; 12. One-way valve I; 13. One-way valve II; 14. First damping element; 15. Friction washer I; 16. Guide rod; 17. Spring I; 18. Mounting bracket; 19. Laser displacement sensor; 20. Bubble level; 21. Second damping element; 22. Rotating shaft; 23. Slide groove; 24. Friction washer II; 25. Slider; 26. Spring II; 27. Retaining ring. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] See Figures 1-5 As shown, this utility model provides a hoist brake shoe gap detection device, including a mounting base 1, a bolt 2 threadedly connected to the mounting base 1, a shrinkage component 9 rotatably connected to the end of the bolt 2, and a mounting frame 18 fixedly connected to the movable end of the shrinkage component 9, a laser displacement sensor 19 rotatably connected to the mounting frame 18, and a bubble level 20 fixedly connected to the laser displacement sensor 19.

[0036] As an optional implementation, the shrink assembly 9 includes a sleeve 11, which is rotatably connected to the end of the bolt 2 via a pin. A piston 10 is slidably connected inside the sleeve 11, and a mounting bracket 18 is fixedly connected to the piston 10. A one-way valve 12 and a one-way valve 13 are fixedly connected to the sleeve 11, and the check direction of the one-way valve 13 and the one-way valve 12 are opposite to each other. The axial directions of the sleeve 11, the pin, and the bolt 2 are consistent.

[0037] One-way valve 12 allows only external air to enter the cavity formed by sleeve 11 and piston 10 (intake valve), while one-way valve 13 allows only air to exit the cavity (exhaust valve). When piston 10 is pushed towards the brake wheel, the air pressure in the cavity increases, one-way valve 13 opens, one-way valve 12 closes, air is discharged, and piston 10 can advance smoothly. When piston 10 is released, a negative pressure is formed in the cavity, one-way valve 12 opens, one-way valve 13 closes, external air enters the cavity, and piston 10 remains in a fixed position, achieving the function of "push adjustment, release locking," maintaining the position of piston 10 without the need for an additional locking structure.

[0038] In the lifting machine brake shoe clearance detection device, the core value of the shrinkage component 9 is to avoid the extrusion deformation problem caused by the rigid connection between the mounting bracket 18 and the bolt 2 through the flexible structure design.

[0039] If the mounting bracket and bolts are rigidly connected, such as by welding or fixing, the position of the mounting bracket will be fixed after the brake shoe is worn thin. When braking, the movement of the brake shoe towards the brake wheel will forcefully push against the mounting bracket, causing plastic deformation of the weak parts of the mounting bracket, such as bending, cracking, or even damage to the sensor. The shrinkage assembly, through the sliding fit of "sleeve 11 + piston 10", transforms the two into a sliding flexible connection, avoiding the compression deformation problem caused by the rigid connection between the mounting bracket 18 and bolt 2.

[0040] A first damping element 14 is provided between the sleeve 11 and the bolt 2 to improve the rotational damping of the sleeve 11. The sleeve 11 is rotatably connected to the end of the bolt 2 via a pin. The axis of the pin is perpendicular to and intersects the axis of the bolt 2. Both ends of the pin should be axially limited by cotter pins or elastic retaining rings to prevent the pin from coming out of the connection hole between the sleeve 11 and the bolt 2. At the same time, a gap of 0.1-0.2mm should be reserved at the connection between the sleeve 11 and the bolt 2 to ensure that the sleeve 11 can rotate flexibly around the pin and to avoid shaking caused by excessive gap.

[0041] The first damping element 14 includes a spring 17 fixedly connected to the end of the sleeve 11. The other end of the spring 17 is fixedly connected to a friction washer 15 that contacts the end of the bolt 2. A guide rod 16 is slidably connected inside the sleeve 11. The guide rod 16 is fixedly connected to the friction washer 15. The guide rod 16 does not penetrate into the cavity between the sleeve 11 and the piston 10.

[0042] The stiffness of spring 17 should be selected to be 5-8 N / mm to ensure that the contact pressure between friction washer 15 and the end of bolt 2 is 10-15 N. This provides sufficient rotational damping to prevent sleeve 11 from rotating on its own due to vibration, while also preventing sleeve 11 from being difficult to manually rotate and adjust. The length of guide rod 16 should be greater than the maximum compression of spring 17. For example, if the free length of spring 17 is 20 mm and the maximum compression is 10 mm, then the length of guide rod 16 should be ≥30 mm to prevent lateral bending of spring 17 when compressed.

[0043] A locking assembly 3 is fixedly connected to the mounting base 1 for supporting the bolt 2.

[0044] The locking assembly 3 includes a fixing plate 5 fixedly connected to the mounting base 1, a screw 6 threadedly connected to the fixing plate 5, a top plate 8 rotatably connected to the end of the screw 6, and a friction pad 7 fixedly connected to the top plate 8 in contact with the surface of the bolt 2.

[0045] The friction pad 7 of the locking assembly 3 should be made of nitrile rubber with a Shore hardness of 60-70A, and the surface should have a diamond-shaped anti-slip texture with a texture depth of 0.5mm to increase the static friction with the surface of the bolt 2; the thread of the screw 6 should be a fine thread such as M10×1, as fine threads have better self-locking performance and can prevent the screw 6 from loosening due to vibration; the rotating connection between the top plate 8 and the screw 6 should be a thrust ball bearing to reduce the friction between the top plate 8 and the screw 6 and ensure that when the screw 6 is rotated, the top plate 8 only moves axially and does not rotate with the screw 6.

[0046] The nut end of bolt 2 has a hexagonal groove 4.

[0047] A rotating shaft 22 is fixedly connected to the laser displacement sensor 19, and the rotating shaft 22 is rotatably connected to the mounting bracket 18. The emitting end of the laser displacement sensor 19 is flush with the end of the mounting bracket 18 away from the bolt 2. Specifically, the plane tolerance between the laser emission surface of the emitting end and the end of the mounting bracket 18 must not exceed 0.05mm to avoid detection errors caused by the flushing deviation.

[0048] A second damping element 21 is provided on the rotating shaft 22 to increase the rotational damping of the rotating shaft 22.

[0049] The second damping element 21 includes a retaining ring 27 fixedly connected to the end of the rotating shaft 22. The rotating shaft 22 has a sliding groove 23, and a slider 25 is slidably connected in the sliding groove 23. A second friction washer 24 is slidably connected to the surface of the rotating shaft 22. The second friction washer 24 is fixedly connected to the slider 25. A second spring 26 is sleeved on the surface of the rotating shaft 22. The two ends of the second spring 26 are fixedly connected to the second friction washer 24 and the retaining ring 27, respectively. The second friction washer 24 is in contact with the surface plane of the mounting bracket 18.

[0050] The stiffness of spring 26 should be selected as 3-5 N / mm, and the contact pressure between friction washer 24 and the surface of mounting bracket 18 should be 8-12 N to ensure that the laser displacement sensor 19 can be manually rotated to adjust the angle and can stably maintain the angle after adjustment; the fit between slider 25 and slide groove 23 should be a transition fit H7 / h6 to ensure that slider 25 slides synchronously with friction washer 24 and avoids circumferential rotation of friction washer 24.

[0051] The laser displacement sensor 19 establishes a connection with external control components such as PLC control cabinets, industrial computers, and remote monitoring platforms via data lines such as RS485 communication lines, Ethernet cables, or wireless modules such as 4G modules. The sensor's signal output terminals, such as analog output terminals (4-20mA) and digital output terminals (RS485), are directly connected to the signal input terminals of the external control components to ensure real-time transmission of detection data.

[0052] 4.2 Data Interaction Content: The laser displacement sensor 19 will collect the "brake shoe and brake wheel gap data" (unit: mm, accuracy: 0.01 mm) and the sensor's own working status data, such as whether there is a fault and whether the power supply is normal, and send them to the external control unit in real time. The external control unit can send control commands to the sensor, such as calibration commands and sampling frequency adjustment commands. The sampling frequency can be set to 1-10Hz to realize remote control of the sensor.

[0053] 4.3 Application scenarios for information transmission:

[0054] 4.3.1 Local Display and Early Warning: After receiving data, the external control unit, such as the on-site PLC control cabinet, displays the gap value in real time on its own display screen. If the value exceeds the preset threshold, such as >2mm or <0.5mm, the control unit triggers a local audible and visual alarm with a volume ≥85dB and a red light to remind on-site personnel to handle the situation promptly.

[0055] Using the above structure, the mounting base 1 is fixed on the brake shoe bracket of the hoist, ensuring that the mounting base 1 is firmly connected to the brake shoe bracket, serving as the fixed reference for the entire device.

[0056] By using the hexagonal groove 4 at the end of bolt 2, and rotating bolt 2 with a wrench, the length of bolt 2 extending out of mounting seat 1 is adjusted by utilizing the threaded engagement between bolt 2 and mounting seat 1, which initially drives the retraction assembly 9 and mounting bracket 18 closer to the brake shoe position.

[0057] Then, put the braking system into braking mode. At this time, the brake shoe will contact the end face of the brake disc. By rotating the bolt 2, the mounting bracket 18 will contact the brake disc. At this time, the laser emitting end will be flush with the brake shoe. After releasing the brake, observe the bubble level 20 on the laser displacement sensor 19 until the bubble level 20 is centered to complete the horizontal calibration. At this time, the laser displacement sensor 19 will be perpendicular to the end face of the brake disc, and the laser displacement sensor 19 can measure the gap between the brake shoe and the brake disc.

[0058] When the brake shoe wears down after long-term use, causing its surface position to change, the piston 10 that pushes the retraction assembly 9 drives the laser displacement sensor 19 to move synchronously until the emitting end is flush with the worn brake shoe surface again.

[0059] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A hoist shoe gap detection device, characterized by: Includes a mounting base (1), on which a bolt (2) is threadedly connected, and a shrink assembly (9) is rotatably connected to the end of the bolt (2), and a mounting bracket (18) is fixedly connected to the movable end of the shrink assembly (9), and a laser displacement sensor (19) is rotatably connected to the mounting bracket (18), and a bubble level (20) is fixedly connected to the laser displacement sensor (19).

2. The device of claim 1, wherein: The shrinking assembly (9) includes a sleeve (11), which is rotatably connected to the end of the bolt (2) by a pin. A piston (10) is slidably connected inside the sleeve (11), and an mounting bracket (18) is fixedly connected to the piston (10). A one-way valve (12) and a one-way valve (13) are fixedly connected to the sleeve (11), and the check direction of the one-way valve (13) and the one-way valve (12) are opposite to each other. The axial direction of the sleeve (11), the pin, and the bolt (2) is consistent.

3. The device of claim 2, wherein: A first damping element (14) is provided between the sleeve (11) and the bolt (2) to improve the rotational damping of the sleeve (11).

4. The device of claim 3, wherein: The first damping element (14) includes a spring (17) fixedly connected to the end of the sleeve (11), and a friction washer (15) that contacts the end of the bolt (2) is fixedly connected to the other end of the spring (17). A guide rod (16) is slidably connected inside the sleeve (11), and the guide rod (16) is fixedly connected to the friction washer (15). The guide rod (16) does not penetrate into the cavity between the sleeve (11) and the piston (10).

5. The hoist shoe gap detection device of claim 1, wherein: A locking assembly (3) is fixedly connected to the mounting base (1) for supporting the bolt (2).

6. The hoist shoe gap detection device of claim 5, wherein: The locking assembly (3) includes a fixing plate (5) fixedly connected to the mounting base (1), a screw (6) threadedly connected to the fixing plate (5), a top plate (8) rotatably connected to the end of the screw (6), and a friction pad (7) fixedly connected to the top plate (8) in contact with the surface of the bolt (2).

7. The hoist shoe gap detection device of claim 1, wherein: The nut end of the bolt (2) is provided with a hexagonal groove (4).

8. The hoist shoe gap detection device of claim 1, wherein: The laser displacement sensor (19) is fixedly connected to a rotating shaft (22), and the rotating shaft (22) is rotatably connected to the mounting bracket (18). The emitting end of the laser displacement sensor (19) is flush with the end of the mounting bracket (18) away from the bolt (2).

9. The hoist shoe gap detection device of claim 8, wherein: A second damping element (21) is provided on the rotating shaft (22) to improve the rotational damping of the rotating shaft (22).

10. The hoist brake shoe clearance detection device according to claim 9, characterized in that: The second damping component (21) includes a retaining ring (27) fixedly connected to the end of the rotating shaft (22). The rotating shaft (22) has a sliding groove (23) and a slider (25) is slidably connected in the sliding groove (23). A second friction washer (24) is slidably connected to the surface of the rotating shaft (22). The second friction washer (24) is fixedly connected to the slider (25). A second spring (26) is sleeved on the surface of the rotating shaft (22). The two ends of the second spring (26) are fixedly connected to the second friction washer (24) and the retaining ring (27) respectively. The second friction washer (24) is in contact with the surface plane of the mounting bracket (18).

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