Overspeed protection backup braking device in form of double friction plates
The overspeed protection backup braking device, which uses a dual-friction-plate design, provides twice the friction torque, solving the problem of insufficient braking torque under heavy lifting loads, saving material costs, and automatically stopping the drum in case of overspeed to prevent safety accidents.
Patent Information
- Application Number
- CN202423223495.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Existing backup braking devices with single friction plates require larger drum diameters under heavy lifting loads, leading to increased material costs and insufficient braking torque, making it difficult to meet braking requirements.
The overspeed protection backup brake device adopts a dual friction plate form, which provides twice the friction torque through the second friction plate, intermediate pressure plate, first friction plate, outer pressure plate, brake disc and pawl mechanism to prevent the drum from overspeeding.
It effectively solves the problem of insufficient braking torque, avoids increasing the drum diameter, saves material costs, and automatically stops the drum when overspeeding to prevent safety accidents.
Smart Images
Figure CN223674203U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to hoisting equipment technical field relates to a double friction piece form's overspeed protection backup brake device. BACKGROUND
[0002] With the development of society, the weight of each hoisting article is getting bigger and bigger, leading to the hoisting load of hoisting equipment also gradually increases. Because the hoisting load is getting bigger and bigger, the torque borne by the drum is also getting bigger and bigger in the hoisting process. If the backup brake of single friction piece form is adopted, the diameter of the drum must be increased accordingly. There must be enough installation space to ensure that the braking torque generated by the friction contact surface can meet the braking requirements. However, the increase of the diameter of the drum will also increase the torque borne by the drum in the hoisting process. Such a structure with mutual increase will greatly increase the material cost. SUMMARY
[0003] The utility model provides a double friction piece form's overspeed protection backup brake device for the above problems, the double friction piece form's overspeed protection backup brake device provides two times of friction torque, avoids the problem of increasing the diameter of the drum, saves the material cost, and effectively solves the problem of insufficient braking torque.
[0004] According to the technical scheme of the utility model: a double friction piece form's overspeed protection backup brake device, including the drive shaft that is connected with motor output shaft, set up on the drive shaft drum, set up on the brake assembly of drum, and for installing the fixed support that brake assembly adopts, drive shaft passes through brake assembly;The end of the drum is provided with an installation slot;The brake assembly includes the second friction piece that is arranged on the bottom of the installation slot, the intermediate pressure disc that is arranged on the outer end of the second friction piece, the first friction piece that is arranged on the outer end of the intermediate pressure disc, the outer pressure disc that is arranged on the outer end of the first friction piece, the brake disc that is connected with the outer pressure disc, and the pawl mechanism that is installed below the brake disc.
[0005] As a further improvement of the utility model, the brake disc includes a ratchet wheel penetrating on the drive shaft, a positioning pin shaft connected with the outer pressure disc, a plurality of cams arranged on the ratchet wheel, a connecting bolt for mounting the cam on the ratchet wheel, a plurality of waist-shaped holes arranged on the ratchet wheel, the waist-shaped holes being arranged close to the outer edge of the ratchet wheel, and the connecting bolt being arranged in the waist-shaped hole.
[0006] As a further improvement of the utility model, the ratchet wheel is provided with a plurality of protrusions, the two sides of the protrusions are respectively inclined surfaces and locking straight surfaces, and the avoiding space is formed between the adjacent inclined surfaces and locking straight surfaces; the pawl mechanism comprises a base fixed on the fixed support, a rotating shaft rotatably connected to the base, a balance arm fixed on the rotating shaft, and a limit switch fixed on the base, the balance arm is provided with a rubber wheel, and the rubber wheel intermittently enters between the adjacent inclined surfaces during the forward rotation of the ratchet wheel.
[0007] As a further improvement of the utility model, the brake disc and the outer pressure disc are connected through a plurality of butterfly springs.
[0008] As a further improvement of the utility model, the other end of the winding drum is connected with the bearing seat through the cylindrical roller bearing, and the bearing seat is installed on the fixed support.
[0009] As a further improvement of the utility model, the plane bearing is installed on the outer side of the brake disc, and one end of the plane bearing is pressed by the adjusting nut.
[0010] The technical effect of the utility model lies in that when the motor appears faults or other problems to cause the excessive speed of the winding drum, the winding drum is stopped by the second friction plate, the intermediate pressure disc, the first friction plate, the outer pressure disc, the brake disc and the pawl mechanism, so that the safety accidents caused by overspeed are prevented; the utility model provides the double friction torque, and effectively solves the problem of insufficient braking torque. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the structural schematic view of the utility model.
[0012] Figure 2 It is the left view of the utility model.
[0013] Figure 3 It is the structural schematic view of the brake disc in the utility model.
[0014] Figure 4 It is the sectional view of the brake disc in the utility model.
[0015] Figure 5 It is the structural schematic view of the pawl mechanism in the utility model. DETAILED DESCRIPTION
[0016] The specific implementation manners of the utility model will be described below in combination with the drawings.
[0017] In order to make the technical personnel better understand the scheme of the utility model, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment, and the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary technical personnel in the art without creative labor should belong to the protection scope of the utility model.
[0018] Figures 1-5 In the utility model, a kind of double-friction-plate type overspeed protection backup brake device, including drive shaft 13 connected with motor output shaft, reel 12 being arranged on the drive shaft 13, brake assembly being arranged on the reel 12, and the fixed support for installing the brake assembly is used, the drive shaft 13 passes through the brake assembly;End of the reel 12 is provided with mounting groove;Brake assembly includes the second friction plate 11 being arranged in the bottom of the mounting groove, the intermediate pressure disc 10 being arranged in the outer end of the second friction plate 11, the first friction plate 9 being arranged in the outer end of intermediate pressure disc 10, the outer pressure disc 8 being arranged in the outer end of the first friction plate 9, the brake disc 5 connected with outer pressure disc 8, and the pawl mechanism 6 being installed below brake disc 5.
[0019] When motor fails or other problems cause reel 12 speed too fast, reel 12 is stopped by second friction plate 11, intermediate pressure disc 10, first friction plate 9, outer pressure disc 8, brake disc 5 and pawl mechanism 6, to prevent safety accident caused by overspeed;The utility model provides double friction torque, effectively solve the problem of insufficient braking torque.
[0020] Brake disc 5 includes ratchet wheel 5-3 being passed in drive shaft 13, positioning pin shaft 5-4 being connected with outer pressure disc 8.Multiple cams 5-1 being arranged on the ratchet wheel 5-3, connecting bolt 5-2 for installing the cam 5-1 on the ratchet wheel 5-3, multiple waist type holes 5-30 are arranged on the ratchet wheel 5-3, the waist type hole 5-30 is close to the outer edge of ratchet wheel 5-3 and is arranged, and connecting bolt 5-2 is arranged in waist type hole 5-30;In the embodiment, braking is carried out by ratchet wheel 5-3, cam 5-1 and pawl mechanism 6.
[0021] The ratchet wheel 5-3 is provided with a plurality of protrusions 5-31, and the two sides of the protrusions 5-31 are respectively inclined surfaces 5-32 and locking straight surfaces 5-33, and the adjacent inclined surfaces 5-32 and locking straight surfaces 5-33 form an avoiding space 5-34; the pawl mechanism 6 comprises a base 6-5 fixed on a fixed support, a rotating shaft 6-3 rotatably connected to the base 6-5, a balance arm 6-2 fixed on the rotating shaft 6-3, and a limit switch 6-4 fixed on the base 6-5, and the balance arm 6-2 is provided with a rubber wheel 6-1, and the rubber wheel 6-1 intermittently enters between the adjacent inclined surfaces 5-32 in the process of the ratchet wheel 5-3 rotating in the positive direction; in the embodiment, during installation, the relative installation positions of the cam 5-1 and the ratchet wheel 5-3 are adjusted through the waist-shaped hole 5-30 on the ratchet wheel 5-3, so that in the normal working speed range, the protrusions of the cam 5-1 slightly hit the rubber wheel 6-1 on the pawl mechanism 6, the rubber wheel 6-1 is impacted by the momentum and rotates a short distance downward around the rotating shaft 6-3, and one end of the balance arm 6-2 is upwardly tilted, and when the ratchet wheel 5-3 rotates to the front end position of the balance arm 6-2, the front end of the balance arm 6-2 has fallen outside the rotating space of the ratchet wheel 5-3, so that the pawl mechanism 6 cannot be locked and braked with the brake disc 5 in the normal speed, and the normal work of the winding drum 12 is not affected; when the motor fails or other problems cause the winding drum 12 to rotate too fast, when the speed exceeds the designed critical value, the protrusions of the cam 5-1 hit the rubber wheel 6-1, and due to the action of the centrifugal force, in the process of the balance arm 6-2 rotating around the rotating shaft 6-3, the rubber wheel 6-1 falls a large distance downward, and at the same time, the distance by which the front end of the balance arm 6-2 is tilted upward is too large, and when the protrusion 5-31 rotates to the front end position of the balance arm 6-2, the front end of the balance arm 6-2 has not fallen into the avoiding space 5-34, so that the balance arm 6-2 abuts against the locking straight surface 5-33, so that the ratchet wheel 5-3 cannot continue to rotate, thereby locking the brake disc 5 and stopping the winding drum 12, preventing safety accidents caused by overspeed, and at the same time, the tail end of the balance arm 6-2 abuts against the trigger limit switch 6-4, and information is fed back to the operator.
[0022] The brake disc 5 and the outer pressure disc 8 are connected through a plurality of butterfly springs 7; in the embodiment, the brake disc 5 and the outer pressure disc 8 are connected through the butterfly springs 7, which can be further improved to improve the braking effect of the brake disc 5.
[0023] The other end of the winding drum 12 is connected with the bearing seat 1 through the cylindrical roller bearing 2, and the bearing seat 1 is installed on the fixed support; in the embodiment, the winding drum 12 is connected with the bearing seat 1 through the cylindrical roller bearing 2, so that the rotation of the winding drum 12 is more labor-saving and smooth.
[0024] The brake disc 5 is provided with a plain bearing 4 on the outer side, and one end of the plain bearing 4 is pressed by an adjusting nut 3; in the embodiment, the brake disc 5 can always rotate through the plain bearing 4.
[0025] AsFigures 1-5 The utility model discloses a kind of double-friction-plate form's overspeed protection backup brake device, reel 12 one end is fixed in motor output end, one end is connected with bearing seat 1 through cylindrical roller bearing 2, bearing seat 1 is installed on fixed support, second friction plate 11 is contacted with the end inner stay plate of reel 12, intermediate pressure disc 10 presses second friction plate 11, first friction plate 9 is installed in the outside of intermediate pressure disc 10, outer pressure disc 8 is installed in the outside of first friction plate 9, brake disc 5 is connected with outer pressure disc 8 through positioning pin shaft, brake disc 5 is equipped with 2 groups of butterfly spring 7 in the middle of outer pressure disc 8, plane bearing 4 is installed on the outside of brake disc 5, plane bearing 4 outer end is pressed tightly with adjusting nut 3, ratchet mechanism 6 is installed below brake disc 5, and ratchet mechanism 6 base is installed on fixed support. When installing, the relative installation position of cam 5-1 and ratchet wheel 5-3 is adjusted by waist-shaped hole on cam 5-1, so that in normal working speed range, the flange of cam 5-1 slightly hits rubber wheel on ratchet mechanism, rubber wheel is impacted by momentum and falls a short distance, so that the front end of balance arm 6-2 is raised upwards, when the pawl on ratchet wheel 5-3 rotates to the front end position of balance arm 6-2, the front end of balance arm 6-2 has fallen to the outside of ratchet wheel 5-3 rotation space, ensure that ratchet mechanism does not lock brake disc 5 in normal speed, without affecting the normal work of reel 12. When motor fails or other problems cause reel 12 to rotate too fast, when speed exceeds the designed critical value, cam 5-1 hits rubber wheel, and due to centrifugal force, rubber wheel falls a larger distance downwards, the front end of balance arm 6-2 is raised too much, when the pawl on ratchet wheel 5-3 rotates to the front end position of balance arm 6-2, the front end of balance arm 6-2 has not fallen to the outside of ratchet wheel 5-3 rotation space, and balance arm 6-2 will stop ratchet wheel 5-3, so as to lock brake disc 5, stop reel 12, prevent safety accidents caused by overspeed, and the tail end of balance arm 6-2 will trigger limit switch, and feedback information to operator.
[0026] Since the hoisting load of the reel 12 is relatively large, the friction required for braking is relatively large, and the size of the friction plate is affected due to the space limitation of the reel 12, and the single friction plate is insufficient to provide sufficient braking torque, and for this problem, the double friction plate is designed, which can provide twice the friction torque, effectively solving the problem of insufficient braking torque. It can be understood that in specific applications, the utility model can also be set as a multi-friction plate structure according to specific needs to meet specific needs.
[0027] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical solutions of the utility model and not to limit, although the utility model is described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and they should be covered in the scope of claims of the utility model.
Claims
1. An overspeed protection back-up brake device in the form of a dual friction plate, characterised in that: The brake assembly is arranged on the driving shaft (13) and comprises a brake disc (5), a pawl mechanism (6), a plurality of butterfly springs (7), a first friction plate (9), a middle pressing plate (10), a second friction plate (11), and an outer pressing plate (8). The brake disc (5) comprises a ratchet wheel (5-3) arranged on the driving shaft (13), a positioning pin shaft (5-4) connected with the outer pressing plate (8), a plurality of cams (5-1) arranged on the ratchet wheel (5-3), a connecting bolt (5-2) for mounting the cams (5-1) on the ratchet wheel (5-3), a plurality of waist-shaped holes (5-30) arranged on the ratchet wheel (5-3), and the waist-shaped holes (5-30) are arranged close to the outer edge of the ratchet wheel (5-3), and the connecting bolt (5-2) is arranged in the waist-shaped hole (5-30).
2. Double friction plate type overrunning backup brake device according to claim 1, characterized in that: The ratchet wheel (5-3) is provided with a plurality of protrusions (5-31), and the two sides of the protrusion (5-31) are respectively an inclined surface (5-32) and a locking straight surface (5-33), and the adjacent inclined surface (5-32) and locking straight surface (5-33) form a avoiding space (5-34); the pawl mechanism (6) comprises a base (6-5) fixed on the fixed support, a rotating shaft (6-3) rotatably connected to the base (6-5), a balance arm (6-2) fixed on the rotating shaft (6-3), a limit switch (6-4) fixed on the base (6-5), and a rubber wheel (6-1) arranged on the balance arm (6-2), and the ratchet wheel (5-3) is in the process of positive rotation, and the rubber wheel (6-1) is intermittently inserted between the adjacent inclined surfaces (5-32).
3. A dual multi-plate format overrunning backup brake device as claimed in claim 2, characterized in that: The brake disc (5) and the outer pressing plate (8) are connected by a plurality of butterfly springs.
4. A dual multi-plate format overrunning backup brake device as claimed in claim 1, characterized in that: The other end of the winding drum (12) is connected with the bearing seat (1) through the cylindrical roller bearing (2), and the bearing seat (1) is mounted on the fixed support.
5. A dual multi-plate format overrunning backup brake device as claimed in claim 1, characterized in that: The brake disc (5) is provided with a plane bearing (4) on the outer side, and one end of the plane bearing (4) is pressed by an adjusting nut.
6. A dual multi-plate format overrunning backup brake device as claimed in claim 1, characterized in that: