Brake structure and protection device for preventing flexible door from falling

Abstract

The utility model provides a brake structure and a protection device used for preventing a flexible door from falling, the brake structure comprises a fixing sleeve, a first brake disc, a brake shell, a second brake disc, an execution body, an elastic piece, a cover plate and a hydraulic station electromagnetic valve, an annular hydraulic oil cavity is formed between the execution body and the brake shell; according to the brake structure, the multiple sets of first brake discs and the multiple sets of second brake discs are combined, compared with a traditional hooking brake mode, the friction brake mode can bear larger impact force, and the situation of thorough out-of-control caused by breakage is not prone to occurring; by adjusting the inner diameter of the oil inlet, the time for the hydraulic oil to be quickly discharged from the annular hydraulic oil cavity can be adjusted, so that the sensitivity is controlled within an extremely short time range.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-fall braking protection devices, in particular to a braking structure and a protection device for preventing a flexible door from falling. Background Art

[0002] Flexible doors are a special type of door. They are widely used in large industrial environments such as hangars, steelmaking industry, mining, warehouses, and logistics channels because of their high wind resistance, sound insulation, heat preservation, moisture resistance, and dust resistance. They are also used in large-span workshops or greenhouses in general factories for rain, wind, and dust protection. Flexible doors are mainly composed of side guides, lower lintels, connecting pieces, fixed frames, PVC curtains, limit rods, guide wheels, wire ropes, safety anti-slip devices, control systems, wire rope storage shafts, drive motors, and other components. The overall frequency conversion control can achieve variable speed control. The door is set to inching control, and the door can be opened and closed at a maximum wind pressure of 10. It has the characteristics of large span, wind resistance, liftability, and space saving.

[0003] The opening and closing of the flexible door is achieved through a drive device (such as an electric hoist). Since the flexible door body is heavy, the wire rope lifting weight is large, and the door leaf is opened frequently, how to ensure the safety of people and property has become a problem that needs to be solved urgently in the event that the wire rope accidentally slips or breaks and the flexible door falls. The main reasons for the flexible door falling are the detachment of the wire rope fixing point, the breakage of the wire rope, and the failure of the limit function. When the flexible door falls, the speed is fast and the impact force is large. The conventional braking structure has a weak ability to withstand the impact force and poor reaction sensitivity. Once the reaction time becomes longer, the self-overlapping of the flexible door adds the falling acceleration, and the falling of the flexible door will become unstoppable.

[0004] Therefore, how to design a braking structure with fast reaction speed, strong impact bearing capacity and the ability to quickly prevent the flexible door from falling when the flexible door falls is a technical problem that has not yet been solved in the prior art. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect in the prior art that when the flexible door falls, the speed is fast and the impact force is large, and the conventional braking structure has a slow reaction speed and poor bearing capacity, and cannot withstand the impact force when the flexible door falls, resulting in the inability to effectively prevent the flexible door from falling. The present invention thus provides a braking structure with a fast reaction speed and strong bearing capacity, which can quickly prevent the flexible door from falling when the flexible door falls.

[0006] The utility model also provides a protective device with the braking structure for preventing the flexible door from falling.

[0007] To this end, the utility model provides a braking structure, comprising:

[0008] A fixed sleeve, suitable for being arranged on the driving shaft;

[0009] At least one first brake disc is mounted on the outer wall of the fixing sleeve by means of a first mounting structure; after the first brake disc is mounted on the outer wall of the fixing sleeve by means of the first mounting structure, it can remain relatively stationary relative to the circumference of the fixing sleeve and can move back and forth relative to the axial direction of the fixing sleeve;

[0010] A brake housing, suitable for fixed installation, sleeved outside the fixing sleeve, and having an annular cavity with an opening facing the fixing sleeve;

[0011] At least one second brake disc is mounted on the inner wall of the annular cavity through a second mounting structure; after the second brake disc is mounted on the inner wall of the annular cavity through the second mounting structure, it can remain relatively stationary relative to the circumference of the annular cavity and can move back and forth relative to the axial direction of the annular cavity;

[0012] The first brake disc and the second brake disc are arranged crosswise and have overlapping surfaces;

[0013] An actuator, movably mounted inside the brake housing, having an extrusion portion;

[0014] There are multiple elastic members, which are evenly arranged at one end of the actuator away from the extrusion part;

[0015] A cover plate, fixedly connected to the brake housing, and used to squeeze the elastic member between the actuator and the cover plate;

[0016] Also included is an annular hydraulic oil chamber formed between the brake housing and the actuator, having at least one oil inlet;

[0017] A hydraulic station solenoid valve, used to control the oil circuit connected to the oil inlet;

[0018] In the initial state, the solenoid valve of the hydraulic station controls the oil circuit connected to the oil inlet to be connected to the external high-pressure oil, and the high-pressure oil enters the annular hydraulic oil chamber from the oil inlet through the oil circuit, squeezing the actuator to the side close to the cover plate, the elastic member is compressed, and there is no squeezing friction between the first brake disc and the second brake disc;

[0019] When the hydraulic station solenoid valve receives a signal and switches to a braking state, the hydraulic station solenoid valve controls the oil circuit connected to the oil inlet to be connected to the oil return channel, and the hydraulic oil in the annular hydraulic oil chamber is discharged to the oil return channel through the oil inlet. The elastic member stretches and drives the actuator to move in a direction away from the cover plate, so that the first brake disc and the second brake disc are squeezed into contact, thereby preventing the first brake disc from rotating and thus preventing the driving shaft from rotating.

[0020] As a preferred solution, the first mounting structure includes:

[0021] first mounting teeth, evenly arranged on the inner annular surface of the first brake disc;

[0022] First mounting grooves are evenly arranged on the outer circumferential surface of the fixing sleeve, and the extending direction of the first mounting grooves is parallel to the axial direction of the fixing sleeve;

[0023] When the first brake disc sleeve is installed on the fixing sleeve, the first mounting tooth fits into the first mounting groove;

[0024] And / or, the second mounting structure comprises:

[0025] second mounting teeth, evenly arranged on the outer annular surface of the second brake disc;

[0026] The second mounting grooves are evenly arranged on the circumferential inner wall of the annular cavity;

[0027] When the second brake disc is mounted on the inner wall of the annular cavity, the second mounting teeth fit into the interior of the second mounting groove.

[0028] As a preferred solution, the first mounting tooth is a trapezoidal tooth, the first mounting groove is a trapezoidal groove, and after the first mounting tooth is fitted and installed into the first mounting groove, two side walls of the first mounting tooth are in close contact with two side walls of the first mounting groove;

[0029] And / or, the second mounting tooth is a trapezoidal tooth, the second mounting groove is a trapezoidal groove, and after the second mounting tooth is fitted and installed into the second mounting groove, the two side walls of the second mounting tooth are in close contact with the two side walls of the second mounting groove.

[0030] As a preferred solution, the first brake disc is a brake pad, and the second brake disc is a steel plate.

[0031] As a preferred solution, the brake housing comprises:

[0032] A fixing ring, suitable for fixing the setting;

[0033] A fixed cylinder, one end of which is fixedly connected to the fixing ring, and the other end of which is fixedly connected to the cover plate, and an inner flange is integrally formed on the inner wall;

[0034] The annular cavity is formed between the fixing ring and the inner flange.

[0035] As a preferred solution, the second brake disc is fixedly mounted at a position of the annular cavity close to the fixing ring.

[0036] As a preferred solution, the actuator includes a cylindrical extrusion portion and an outer flange;

[0037] The extrusion portion is installed on the inner side surface of the inner flange, and the outer diameter of the extrusion portion is the same as the inner diameter of the inner flange;

[0038] The outer flange is located at the outer side of the inner flange, and forms the annular hydraulic oil chamber between the outer flange and the inner flange.

[0039] As a preferred solution, a first annular seal is provided between the inner flange and the extrusion portion; and a second annular seal is provided between the outer flange and the inner wall of the fixing tube.

[0040] As a preferred solution, the thickness of the annular cavity portion formed by the fixing ring is substantially equal to the sum of the thickness of the annular cavity portion formed by the inner flange and the thickness of the extrusion portion.

[0041] As a preferred solution, the second brake disc is fixedly provided at the end of the extrusion portion.

[0042] As a preferred embodiment, a plurality of first mounting cavities are evenly arranged on the end surface of the extrusion portion facing the cover plate; a plurality of second mounting cavities opposite to the first mounting cavities are evenly arranged on the end surface of the cover plate facing the actuator, and the first mounting cavity and the second mounting cavity are connected to each other to install the elastic member.

[0043] As a preferred solution, the fixing ring is provided with a plurality of first mounting holes, the fixing cylinder is provided with a plurality of second mounting holes respectively opposite to the first mounting holes, and the cover plate is provided with a plurality of third mounting holes respectively opposite to the second mounting holes, and through bolts are passed through the first mounting holes, the second mounting holes and the third mounting holes and then screwed with nuts, so that the fixing ring, the fixing cylinder and the cover plate are fixedly connected together.

[0044] The utility model also provides a protective device for preventing a flexible door from falling, comprising:

[0045] A first bracket plate is fixedly arranged and has a first mounting through hole in the middle;

[0046] A second bracket plate is fixedly arranged opposite to the first bracket plate, and a second mounting through hole opposite to the first mounting through hole is opened in the middle;

[0047] Two bearing chambers are respectively arranged on the inner walls of the first mounting through hole and the second mounting through hole;

[0048] A bearing, mounted inside the bearing chamber;

[0049] A driving shaft, rotatably mounted inside the first mounting through hole and the second mounting through hole through the bearing, and used for winding a steel wire rope;

[0050] A driving motor, fixedly mounted on the outside of the first bracket plate, for driving the driving shaft to rotate;

[0051] It also includes a braking structure, which is any of the braking structures described above; the braking housing is fixedly mounted on the outside of the second bracket plate, and the fixing sleeve is sleeved on the portion of the driving shaft extending out of the outside of the second bracket plate.

[0052] As a preferred solution, it also includes:

[0053] Two reinforcing rings are fixedly sleeved on the outer wall of the driving shaft;

[0054] An outer cylinder, fixedly arranged outside the two reinforcement rings, and having a length substantially the same as the distance between the first bracket plate and the second bracket plate;

[0055] A thread groove is formed on the outer wall of the outer cylinder and is used to accommodate the steel wire rope.

[0056] As a preferred solution, it also includes two first thrust retaining springs, which are respectively fixedly installed on the outer sides of the reinforcement ring;

[0057] And / or, there are two second thrust retaining springs, which are respectively fixedly installed at positions of the driving shaft close to the bearing.

[0058] As a preferred solution, the bearing chamber mounted on the first bracket plate is provided with a blocking flange at one end facing inward, for blocking one end of the outer wall of the bearing;

[0059] A fixing plate is fixedly mounted on the outer side of the first bracket plate, and a pressing flange is provided on the fixing plate for blocking the other end of the outer wall of the bearing;

[0060] A motor bracket is also fixedly arranged on the outer side of the fixing plate, and the driving motor is fixedly mounted on the motor bracket.

[0061] As a preferred solution, the bearing chamber mounted on the second bracket plate is provided with a blocking flange at one end facing outward, for blocking one end of the outer wall of the bearing;

[0062] A bearing cover plate is fixedly arranged at the inner end of the bearing chamber, and a cover plate flange is provided on the bearing cover plate for blocking the other end of the outer wall of the bearing.

[0063] The technical solution provided by the utility model has the following advantages:

[0064] 1. The brake structure of the utility model comprises a fixed sleeve, a first brake disc, a brake housing, a second brake disc, an actuator, an elastic member, a cover plate and a hydraulic station solenoid valve. The actuator is movably mounted inside the brake housing, and an annular hydraulic oil chamber is formed between the actuator and the brake housing. In the initial state, the hydraulic station solenoid valve controls the oil circuit connected to the oil inlet to be connected to the external high-pressure oil, and the high-pressure oil enters the annular hydraulic oil chamber from the oil inlet through the oil circuit, driving the actuator to the side close to the cover plate. At this time, the elastic member is compressed, and there is basically no squeezing friction between the first brake disc and the second brake disc. The fixed sleeve with the first brake disc installed can rotate with the driving shaft, and the rotation of the driving shaft is not restricted. When a fall occurs, the hydraulic station solenoid valve receives a fall signal and quickly switches to a braking state. The hydraulic station solenoid valve controls the oil circuit connected to the oil inlet to When the oil return channel is connected, the hydraulic oil in the annular hydraulic oil chamber is rapidly discharged from the oil inlet to the oil return channel, the elastic member stretches, and the driving actuator moves in the direction away from the cover plate, squeezing the first brake disc and the second brake disc into friction contact. At this time, the fixing sleeve with the first brake disc installed is restricted from rotating, thereby restricting the driving shaft from rotating, thereby achieving the braking purpose; the braking structure of the utility model adopts a combination of multiple groups of first brake discs and multiple groups of second brake discs. This friction braking method can withstand greater impact force than the traditional hook braking method, and is not prone to breakage, failure to hook, etc., which may lead to complete loss of control; by adjusting the inner diameter of the oil inlet, the time for the hydraulic oil to be rapidly discharged from the annular hydraulic oil chamber can be adjusted, thereby controlling the sensitivity within the target range, such as controlling the reaction time to about 0.1 seconds.

[0065] 2. The brake structure of the utility model, the first mounting structure includes a first mounting tooth and a first mounting groove, the first mounting tooth is evenly arranged on the inner annular surface of the first brake disc, the first mounting groove is evenly opened on the outer circumferential surface of the fixed sleeve, and the extension direction of the first mounting groove is parallel to the axial direction of the fixed sleeve; the second mounting structure includes a second mounting tooth and a second mounting groove, the second mounting tooth is evenly arranged on the outer annular surface of the second brake disc, and the second mounting groove is evenly opened on the circumferential inner wall of the annular cavity;

[0066] The advantage of this structural setting is that when the driving shaft rotates, it drives the fixed sleeve arranged outside it to rotate together, and the fixed sleeve drives the first brake disc to rotate synchronously with it through the first mounting groove and the first mounting tooth. At this time, the second brake disc does not contact the first brake disc; when a fall occurs, the actuator squeezes the first brake disc or the second brake disc, so that the first brake disc moves along the opening direction of the first mounting groove, and the second brake disc moves along the opening direction of the second mounting groove, thereby squeezing the first brake disc and the second brake disc together, and by means of the friction force between the two, the first brake disc is braked and fixed, and then the fixed sleeve is braked and fixed, and finally the driving shaft is braked and fixed.

[0067] 3. In the braking structure of the utility model, the brake housing includes a fixing ring and a fixing cylinder, and an annular cavity is formed between the fixing ring and the fixing cylinder. The above arrangement can facilitate the assembly of the first brake disc and the second brake disc; the second brake disc is fixedly installed at a position close to the fixing ring in the annular cavity. The second brake disc is arranged at this position to avoid direct friction between the first brake disc and the fixing ring.

[0068] 4. The utility model also provides a protective device for preventing a flexible door from falling, comprising a first bracket plate, a second bracket plate, a bearing chamber, a bearing, a driving shaft, a driving motor and a brake structure, wherein the brake housing is fixedly mounted on the second bracket plate, and the fixed sleeve is sleeved on the portion of the driving shaft extending out of the second bracket plate; the driving shaft is mounted between the two fixed first bracket plates and the second bracket plate through the bearing and the bearing chamber, and is used to wind a steel wire rope under the driving action of the driving motor, and the brake structure is arranged on the outside of the second bracket plate, wherein the brake housing is fixedly mounted on the outside of the second bracket plate, and the fixed sleeve is sleeved on the portion of the driving shaft extending out of the second bracket plate;

[0069] The protective device of the utility model operates synchronously with the main driving device that drives the flexible door to open and close up and down. When the flexible door rises or falls, the wire rope of the protective device of the utility model also rises or falls with a certain pre-tightening force. At this time, the braking structure does not restrict the driving shaft. The driving shaft rotates under the drive of the driving motor, and the wire rope is wound around the driving shaft or released from the driving shaft. When falling occurs (such as the wire rope of the main driving device breaks), the braking structure restricts the driving shaft so that it cannot rotate, and the wire rope takes over the wire rope of the main driving device to tighten the flexible door to avoid falling.

[0070] The protective device of the utility model is combined with multiple groups of first brake discs and multiple groups of second brake discs. This friction braking method can withstand greater impact force than the traditional hook braking method, and is not prone to breakage, failure to hook, etc., which may lead to complete loss of control. By adjusting the inner diameter of the oil inlet, the time for the hydraulic oil to be quickly discharged from the annular hydraulic oil chamber can also be adjusted, thereby controlling the sensitivity within the target range, such as controlling the reaction time to about 0.1 seconds, so the reaction is very sensitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the technical solutions in the prior art or the specific implementation methods of the present utility model, the drawings used in the description of the prior art or the specific implementation methods are briefly introduced below.

[0072] Figure 1 It is a cross-sectional view of the brake structure of the utility model.

[0073] Figure 2 yes Figure 1Schematic diagram of the structure after installation on the second bracket plate of the protective device.

[0074] Figure 3 It is an assembly cross-sectional view of the driving shaft, the fixing sleeve and the first brake disc.

[0075] Figure 4 is a cross-sectional view of the fixing sleeve.

[0076] Figure 5 is a cross-sectional view of the first brake disc.

[0077] Figure 6 It is a cross-sectional view of the fixed sleeve and the first brake disc after assembly.

[0078] Figure 7 It is a longitudinal sectional view after the fixing sleeve and the first brake disc are assembled.

[0079] Figure 8 is a cross-sectional view of the annular cavity of the brake housing.

[0080] Fig. 9 is a cross-sectional view of the second brake disc.

[0081] Fig.10 It is a cross-sectional view of the second brake disc installed in the annular cavity.

[0082] Fig.11 It is a longitudinal sectional view of the second brake disc installed inside the brake housing.

[0083] Fig.12 It is a schematic diagram of the operating status of the brake structure when the solenoid valve of the hydraulic station is in the initial state.

[0084] Fig.13 It is a schematic diagram of the operating status of the brake structure when the solenoid valve of the hydraulic station is in the braking state.

[0085] Fig.14 The utility model is a schematic diagram of the overall structure of a protective device for preventing a flexible door from falling.

[0086] Reference numerals:

[0087] 100. Driving shaft;

[0088] 200, fixing sleeve; 201, first brake disc; 203, first mounting tooth; 204, first mounting groove;

[0089] 210, brake housing; 211, annular cavity; 212, second brake disc; 213, annular hydraulic oil cavity; 214, oil inlet; 215, second mounting tooth; 216, second mounting groove; 217, fixing ring; 218, fixing cylinder; 219, inner flange;

[0090] 220, actuator; 221, extrusion portion; 222, outer flange;

[0091] 230, elastic member; 231, first installation cavity; 232, second installation cavity;

[0092] 240, cover plate;

[0093] 251, first mounting hole; 252, second mounting hole; 253, third mounting hole; 254, through bolt;

[0094] 310, first annular seal; 320, second annular seal;

[0095] 411, first bracket plate; 412, first mounting through hole; 413, second bracket plate; 414, second mounting through hole;

[0096] 421, bearing chamber; 422, bearing; 423, blocking flange; 424, bearing end cover; 425, cover plate flange;

[0097] 430, driving motor; 431, fixing plate; 432, pressing flange; 433, motor bracket;

[0098] 441, reinforcing ring; 442, outer cylinder; 443, threaded groove; 444, first thrust retaining spring; 445, second thrust retaining spring;

[0099] 5. Hydraulic station solenoid valve. DETAILED DESCRIPTION

[0100] In order to make those skilled in the art better understand the present solution, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0101] It should be noted that the terms "first", "second", etc. in the claims and description of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not limited to those steps or units clearly listed, but may also include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0102] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the term "multiple" should mean two or more. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

[0103] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Example 1

[0104] This embodiment provides a braking structure, such as Figure 1-11 As shown, it includes: a fixing sleeve 200, a first brake disc 201, a brake housing 210, a second brake disc 212, an actuator 220, an elastic member 230, a cover plate 240 and a hydraulic station solenoid valve 5; wherein:

[0105] The fixing sleeve 200 is suitable for being fixedly sleeved on the driving shaft 100; there is at least one first brake disc 201, which is sleeved on the outer wall of the fixing sleeve 200 through a first mounting structure; after the first brake disc 201 is sleeved on the outer wall of the fixing sleeve 200 through the first mounting structure, it can remain relatively still relative to the circumference of the fixing sleeve 200, and can move back and forth relative to the axial direction of the fixing sleeve 200; the brake housing 210 is suitable for fixed installation, sleeved on the outside of the fixing sleeve 200, and has an annular cavity 211 with an opening facing the fixing sleeve 200; there is at least one second brake disc 212, which is installed on the inner wall of the annular cavity 211 through a second mounting structure; after the second brake disc 212 is installed on the inner wall of the annular cavity 211 through the second mounting structure, it can remain relatively still relative to the circumference of the annular cavity 211, and can Axial back and forth movement relative to the annular cavity 211; the first brake disc 201 and the second brake disc 212 are cross-arranged, that is, the first brake disc 201, the second brake disc 212, the first brake disc 201, the second brake disc 212 are cross-arranged in this way, and have overlapping surfaces; the actuator 220 is movably installed inside the brake housing 210, and has an extrusion portion 221; there are multiple elastic members 230, which are evenly arranged at one end of the actuator 220 away from the extrusion portion 221; the cover plate 240 is fixedly connected to the brake housing 210, and is used to squeeze the elastic member 230 between the actuator 220 and the cover plate 240; it also includes an annular hydraulic oil chamber 213, formed between the brake housing 210 and the actuator 220, and has at least one oil inlet 214; the hydraulic station solenoid valve 5 is used to control the opening and closing of the oil inlet 214.

[0106] In the initial state, the hydraulic station solenoid valve 5 controls the oil circuit connected to the oil inlet 214 to be connected to the external high-pressure oil, and the high-pressure oil enters the annular hydraulic oil chamber 213 from the oil inlet 214 through the oil circuit, squeezes the actuator 220 to the side close to the cover plate 240, and the elastic member 230 is compressed, and there is no squeezing friction between the first brake disc 201 and the second brake disc 212;

[0107] When the hydraulic station solenoid valve 5 receives a signal to switch to a braking state, the hydraulic station solenoid valve 5 controls the oil circuit connected to the oil inlet 214 to be connected to the oil return channel, and the hydraulic oil in the annular hydraulic oil chamber 213 is discharged to the oil return channel through the oil inlet 214. The elastic member 230 stretches to drive the actuator 220 to move away from the cover plate 240, so that the first brake disc 201 and the second brake disc 212 are squeezed and contacted, thereby preventing the first brake disc 201 from rotating and thus preventing the driving shaft 100 from rotating.

[0108] The braking structure of this embodiment is composed of multiple groups of first brake discs 201 and multiple groups of second brake discs 212. This friction braking method can withstand greater impact force than the traditional hook braking method, and is not prone to breakage, failure to hook, etc., which may lead to complete loss of control. By adjusting the inner diameter of the oil inlet 214, the time for the hydraulic oil to be quickly discharged from the annular hydraulic oil chamber 213 can be adjusted, thereby controlling the sensitivity within the target range, such as controlling the reaction time to about 0.1 seconds.

[0109] In this embodiment, the first mounting structure includes a first mounting tooth 203 and a first mounting groove 204; wherein, the first mounting tooth 203 is evenly arranged on the inner annular surface of the first brake disc 201; the first mounting groove 204 is evenly opened on the outer circumferential surface of the fixing sleeve 200, and the extension direction of the first mounting groove 204 is parallel to the axial direction of the fixing sleeve 200; when the first brake disc 201 is sleeved and installed on the fixing sleeve 200, the first mounting tooth 203 fits into the first mounting groove 204.

[0110] The second mounting structure includes a second mounting tooth 215 and a second mounting groove 216; wherein, the second mounting tooth 215 is evenly arranged on the outer annular surface of the second brake disc 212; the second mounting groove 216 is evenly opened on the circumferential inner wall of the annular cavity 211; when the second brake disc 212 is installed on the inner wall of the annular cavity 211, the second mounting tooth 215 fits into the inside of the second mounting groove 216.

[0111] Preferably, the first mounting tooth 203 is a trapezoidal tooth, and the first mounting groove 204 is a trapezoidal groove. After the first mounting tooth 203 is installed and fits into the first mounting groove 204, the two side walls of the first mounting tooth 203 fit in contact with the two side walls of the first mounting groove 204; the second mounting tooth 215 is a trapezoidal tooth, and the second mounting groove 216 is a trapezoidal groove. After the second mounting tooth 215 is installed and fits into the second mounting groove 216, the two side walls of the second mounting tooth 215 fit in contact with the two side walls of the second mounting groove 216.

[0112] In this embodiment, the first brake disc 201 is a brake pad, and the second brake disc 212 is a steel plate.

[0113] like Figure 1-2 As shown, the brake housing 210 includes a fixing ring 217 and a fixing cylinder 218, wherein the fixing ring 217 is suitable for fixed setting; one end of the fixing cylinder 218 is fixedly connected to the fixing ring 217, and the other end is fixedly connected to the cover plate 240, and a circle of inner flange 219 is integrally formed on the inner wall; the annular cavity 211 is formed between the fixing ring 217 and the inner flange 219.

[0114] Preferably, the second brake disc 212 is fixedly mounted in a position of the annular cavity 211 close to the fixing ring 217 .

[0115] like Figure 1 As shown, the actuator 220 includes a cylindrical extrusion portion 221 and an outer flange 222; the extrusion portion 221 is installed on the inner side surface of the inner flange 219, and the outer diameter of the extrusion portion 221 is the same as the inner diameter of the inner flange 219; the outer flange 222 is located on the outer side of the inner flange 219, and forms the annular hydraulic oil chamber 213 between the outer flange 222 and the inner flange 219.

[0116] A first annular seal 310 is disposed between the inner flange 219 and the extrusion portion 221 ; a second annular seal 320 is disposed between the outer flange 222 and the inner wall of the fixing tube 218 .

[0117] Preferably, the thickness of the portion of the annular cavity 211 formed by the fixing ring 217 is substantially equal to the sum of the thickness of the portion of the annular cavity 211 formed by the inner flange 219 and the thickness of the extrusion portion 221 .

[0118] Preferably, the second brake disc 212 is fixedly disposed at the end of the extrusion portion 221 .

[0119] Preferably, a plurality of first mounting cavities 231 are evenly arranged on the end surface of the extrusion portion 221 facing the cover plate 240; a plurality of second mounting cavities 232 opposite to the first mounting cavities 231 are evenly arranged on the end surface of the cover plate 240 facing the actuator 220, and the first mounting cavity 231 and the second mounting cavity 232 are used to install the elastic member 230 after being docked.

[0120] like Figure 2 As shown, the fixing ring 217 is provided with a plurality of first mounting holes 251, the fixing cylinder 218 is provided with a plurality of second mounting holes 252 respectively opposite to the first mounting holes 251, and the cover plate 240 is provided with a plurality of third mounting holes 253 respectively opposite to the second mounting holes 252. Through bolts 254 are passed through the first mounting holes 251, the second mounting holes 252 and the third mounting holes 253 and then screwed with nuts, so that the fixing ring 217, the fixing cylinder 218 and the cover plate 219 are fixedly connected together.

[0121] The braking principle of the braking structure used to prevent the flexible door from falling in this embodiment is as follows: Figure 12-13 As shown,

[0122] In the initial state, if Fig.12As shown, the hydraulic station solenoid valve 5 controls the oil circuit connected to the oil inlet 214 to be connected to the external high-pressure oil, and the high-pressure oil enters the annular hydraulic oil chamber 213 from the oil inlet 214 through the oil circuit, squeezes the actuator 220 to the side close to the cover plate 240, and the elastic member 230 is compressed, and there is no squeezing friction between the first brake disc 201 and the second brake disc 212;

[0123] like Fig.13 As shown, when the hydraulic station solenoid valve 5 receives a signal to switch to the braking state, the hydraulic station solenoid valve 5 controls the oil circuit connected to the oil inlet 214 to be connected to the oil return channel, and the hydraulic oil in the annular hydraulic oil chamber 213 is discharged to the oil return channel through the oil inlet 214, and the elastic member 230 stretches to drive the actuator 220 to move away from the cover plate 240, so that the first brake disc 201 and the second brake disc 212 are squeezed and contacted, thereby preventing the first brake disc 201 from rotating and thus preventing the driving shaft 100 from rotating. Example 2

[0124] This embodiment provides a protective device for preventing a flexible door from falling, such as Fig.14 As shown, it includes: a first bracket plate 411, a second bracket plate 413, a bearing chamber 421, a bearing 422, a driving shaft 100, a driving motor 430 and a braking structure; specifically:

[0125] The first bracket plate 411 is fixedly arranged, and a first mounting hole 412 is opened in the middle; the second bracket plate 413 is fixedly arranged, opposite to the first bracket plate 411, and a second mounting hole 414 opposite to the first mounting hole 412 is opened in the middle; there are two bearing chambers 421, which are respectively fixedly arranged on the inner walls of the first mounting hole 412 and the second mounting hole 414; the bearing 422 is installed inside the bearing chamber 421; the driving shaft 100 is rotatably mounted inside the first mounting hole 412 and the second mounting hole 414 through the bearing 422 for winding a wire rope; the driving motor 430 is fixedly mounted on the outside of the first bracket plate 411 for driving the driving shaft 100 to rotate; it also includes a braking structure, which is the braking structure described in Example 1; the brake housing 210 is fixedly mounted on the outside of the second bracket plate 413, and the fixed sleeve 200 is sleeved on the part of the driving shaft 100 extending out of the outside of the second bracket plate 413.

[0126] A reinforcement ring 441 and an outer cylinder 442 are also provided on the periphery of the driving shaft 100; wherein, there are two reinforcement rings 441, which are fixedly sleeved on the outer wall of the driving shaft 100; the outer cylinder 442 is fixedly arranged on the outside of the two reinforcement rings 441, and its length is basically the same as the distance between the first bracket plate 411 and the second bracket plate 413; a threaded groove 443 is formed on the outer wall of the outer cylinder 442 for accommodating a steel wire rope.

[0127] It also includes two first thrust retaining springs 444, which are fixedly mounted on the outside of the reinforcing ring 441; and two second thrust retaining springs 445, which are fixedly mounted on the driving shaft 100 at positions close to the bearing 422. The first thrust member 444 and the second thrust member 445 are both known components, and their structures are not described in detail.

[0128] The bearing chamber 421 installed on the first bracket plate 411 is provided with a blocking flange 423 at one end facing the inside, which is used to block one end of the outer wall of the bearing 422; a fixing plate 431 is fixedly installed on the outer side of the first bracket plate 411, and a pressing flange 432 is provided on the fixing plate 431, which is used to block the other end of the outer wall of the bearing 422; a motor bracket 433 is also fixedly provided on the outer side of the fixing plate 431, and the driving motor 430 is fixedly installed on the motor bracket 433.

[0129] The bearing chamber 421 installed on the second bracket plate 413 is provided with a blocking flange 423 at the end facing outward, which is used to block one end of the outer wall of the bearing 422; a bearing cover plate 424 is fixedly installed at the end facing inward of the bearing chamber 421, and the bearing cover plate 424 is provided with a cover plate flange 425 for blocking the other end of the outer wall of the bearing 422.

[0130] During normal operation, the protection device of this embodiment operates synchronously with the main drive device that drives the flexible door to open and close up and down, and the braking structure does not limit the driving shaft. The driving shaft 100 rotates under the drive of the driving motor 430, and the wire rope is wound around the driving shaft 100 or the wire rope is released from the driving shaft 100; when falling occurs (such as the wire rope of the main drive device breaks), various sensors send the received signals to the hydraulic station solenoid valve 5, and the hydraulic station solenoid valve 5 quickly switches to the braking state. The braking structure quickly limits the driving shaft 100 so that it cannot rotate, and the wire rope takes over the wire rope of the main drive device to tighten the flexible door to avoid falling.

[0131] The protection device of this embodiment is composed of multiple groups of first brake discs 201 and multiple groups of second brake discs 212. This friction braking method can withstand greater impact force than the traditional hook braking method, and is not prone to breakage, failure to hook, etc., which may lead to complete loss of control. By adjusting the inner diameter of the oil inlet 214, the time for the hydraulic oil to be quickly discharged from the annular hydraulic oil chamber 213 can also be adjusted, so that the sensitivity can be controlled within the target range, such as controlling the reaction time to about 0.1 seconds, so the reaction is very sensitive.

[0132] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of this innovative technical solution.

Claims

1. A braking structure, characterized in that: include: A fixed sleeve (200), adapted to be arranged on the driving shaft (100); At least one first brake disc (201) is sleeved on the outer wall of the fixing sleeve (200) via a first mounting structure; after the first brake disc (201) is sleeved on the outer wall of the fixing sleeve (200) via the first mounting structure, it can remain relatively still in the circumferential direction of the fixing sleeve (200) and can move back and forth in the axial direction of the fixing sleeve (200); A brake housing (210), suitable for fixed installation, sleeved outside the fixing sleeve (200), and having an annular cavity (211) with an opening facing the fixing sleeve (200); at least one second brake disc (212) mounted on the inner wall of the annular cavity (211) via a second mounting structure; after the second brake disc (212) is mounted on the inner wall of the annular cavity (211) via the second mounting structure, it can remain relatively still relative to the circumference of the annular cavity (211) and can move back and forth relative to the axial direction of the annular cavity (211); The first brake disc (201) and the second brake disc (212) are arranged crosswise and have overlapping surfaces; An actuator (220) is movably mounted inside the brake housing (210) and has a pressing portion (221); A plurality of elastic members (230) are evenly arranged at an end of the actuator (220) away from the extrusion portion (221); A cover plate (240) fixedly connected to the brake housing (210) and used to squeeze the elastic member (230) between the actuator (220) and the cover plate (240); It also includes an annular hydraulic oil chamber (213) formed between the brake housing (210) and the actuator (220) and having at least one oil inlet (214); A hydraulic station solenoid valve (5), used for controlling an oil circuit connected to the oil inlet (214); In the initial state, the hydraulic station solenoid valve (5) controls the oil circuit connected to the oil inlet (214) to be connected to the external high-pressure oil, and the high-pressure oil enters the annular hydraulic oil chamber (213) from the oil inlet (214) through the oil circuit, squeezing the actuator (220) to a side close to the cover plate (240), the elastic member (230) is compressed, and there is no squeezing friction between the first brake disc (201) and the second brake disc (212); When the hydraulic station solenoid valve (5) receives a signal and switches to a braking state, the hydraulic station solenoid valve (5) controls the oil circuit connected to the oil inlet (214) to be connected to the oil return channel, and the hydraulic oil in the annular hydraulic oil chamber (213) is discharged to the oil return channel through the oil inlet (214). The elastic member (230) stretches to drive the actuator (220) to move in a direction away from the cover plate (240), so that the first brake disc (201) and the second brake disc (212) are in compression contact, thereby preventing the first brake disc (201) from rotating and thereby preventing the driving shaft (100) from rotating.

2. The brake structure according to claim 1, characterized in that: The first mounting structure comprises: first mounting teeth (203) uniformly arranged on the inner annular surface of the first brake disc (201); First installation grooves (204) are evenly arranged on the outer circumferential surface of the fixing sleeve (200), and the extension direction of the first installation grooves (204) is parallel to the axial direction of the fixing sleeve (200); When the first brake disc (201) is sleeved and mounted on the fixing sleeve (200), the first mounting teeth (203) fit into the first mounting groove (204); And / or, the second mounting structure comprises: Second mounting teeth (215) are evenly arranged on the outer annular surface of the second brake disc (212); The second mounting grooves (216) are evenly arranged on the circumferential inner wall of the annular cavity (211); When the second brake disc (212) is mounted on the inner wall of the annular cavity (211), the second mounting teeth (215) fit into the interior of the second mounting groove (216).

3. The brake structure according to claim 1, characterized in that: The first brake disc (201) is a brake pad, and the second brake disc (212) is a steel plate.

4. The brake structure according to claim 1, characterized in that: The brake housing (210) comprises: A fixing ring (217) adapted for fixed setting; A fixed cylinder (218), one end of which is fixedly connected to the fixed ring (217), and the other end of which is fixedly connected to the cover plate (240), and an inner flange (219) is integrally formed on the inner wall; The annular cavity (211) is formed between the fixing ring (217) and the inner flange (219).

5. The brake structure according to claim 4, characterized in that: The actuator (220) comprises a cylindrical extrusion portion (221) and an outer flange (222); The extrusion portion (221) is installed on the inner side surface of the inner flange (219), and the outer diameter of the extrusion portion (221) is the same as the inner diameter of the inner flange (219); The outer flange (222) is located outside the inner flange (219), and forms the annular hydraulic oil chamber (213) between the outer flange (222) and the inner flange (219).

6. The brake structure according to claim 5, characterized in that: A first annular seal (310) is provided between the inner flange (219) and the extrusion portion (221); and a second annular seal (320) is provided between the outer flange (222) and the inner wall of the fixing cylinder (218).

7. The brake structure according to claim 4, characterized in that: The thickness of the portion of the annular cavity (211) formed by the fixing ring (217), the thickness of the portion of the annular cavity (211) formed by the inner flange (219), and the sum of the thickness of the extrusion portion (221) are substantially equal.

8. The brake structure according to claim 5, characterized in that: A plurality of first mounting cavities (231) are evenly arranged on the end surface of the extrusion portion (221) facing the cover plate (240); a plurality of second mounting cavities (232) opposite to the first mounting cavities (231) are evenly arranged on the end surface of the cover plate (240) facing the actuator (220); the first mounting cavity (231) and the second mounting cavity (232) are used to mount the elastic member (230) after being butt-jointed.

9. A protective device for preventing a flexible door from falling, characterized in that: include: A first bracket plate (411) is fixedly arranged and has a first mounting through hole (412) in the middle; A second bracket plate (413) is fixedly arranged opposite to the first bracket plate (411), and has a second mounting through hole (414) in the middle thereof opposite to the first mounting through hole (412); There are two bearing chambers (421), which are respectively fixedly arranged on the inner walls of the first mounting through hole (412) and the second mounting through hole (414); A bearing (422) installed inside the bearing chamber (421); A driving shaft (100) is rotatably mounted inside the first mounting through hole (412) and the second mounting through hole (414) via the bearing (422) and is used for winding a steel wire rope; A driving motor (430) fixedly mounted on the outside of the first bracket plate (411) and used for driving the driving shaft (100) to rotate; The invention is characterized in that: it also includes a braking structure, and the braking structure is the braking structure described in any one of claims 1 to 8; the braking housing (210) is fixedly mounted on the outside of the second bracket plate (413), and the fixing sleeve (200) is sleeved on the portion of the driving shaft (100) extending outward from the outside of the second bracket plate (413).

10. The protection device according to claim 9, characterized in that: The bearing chamber (421) mounted on the first bracket plate (411) is provided with a blocking flange (423) at one end facing inward, which is used to block one end of the outer wall of the bearing (422); A fixing plate (431) is fixedly mounted on the outside of the first bracket plate (411), and a pressing flange (432) is provided on the fixing plate (431) for blocking the other end of the outer wall of the bearing (422); A motor bracket (433) is also fixedly provided on the outer side of the fixing plate (431), and the driving motor (430) is fixedly mounted on the motor bracket (433).

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