Centrifugal and electromagnetic double-acting brake and electric lifting cylinder

Abstract

A centrifugal and electromagnetic double-acting brake, comprising: a first shaft sleeve (3), configured for connecting to a rotating shaft and for connecting to a brake rotor (21); a friction plate (17), configured for being mounted near the brake rotor; a centrifugal braking mechanism, wherein after the first shaft sleeve starts to rotate, a centrifugal block (9) within the centrifugal braking mechanism moves outward in a radial direction of the first shaft sleeve, so as to enable, by means of a linkage rod (12), the rotating friction plate to press against a structure having no circular motion, and generate a braking torque on the brake rotor, the braking torque being positively correlated with the rotational speed of the rotating shaft, such that the rotational speed of the rotating shaft is controlled within a set value range; an electromagnetic braking mechanism, wherein when an electromagnet (16) within the electromagnetic braking mechanism is powered off, the rotating friction plate is pressed against the structure having no circular motion by means of a first elastic component (22), so as to generate a braking torque. The centrifugal and electromagnetic double-acting brake saves on mounting space, and only requires regular maintenance of a friction liner at a single location, making the maintenance process simple. Also disclosed are a lifting electric cylinder, a foldback electric cylinder, and a linear electric cylinder of the centrifugal and electromagnetic double-acting brake.

Description

Centrifugal and electromagnetic double-acting brake and lifting electric cylinder TECHNICAL FIELD

[0001] The application belongs to the technical field of electric cylinders, and particularly relates to a centrifugal and electromagnetic double-acting brake and lifting electric cylinder. BACKGROUND

[0002] An electric cylinder is a mechatronic assembly driven by an electric motor through a belt, a gear, a speed reducer or a direct drive lead screw. The transmission mechanism inside the electric cylinder converts the rotary motion of the electric motor into linear motion, achieving the same extension and retraction action as a pneumatic cylinder or a hydraulic cylinder. Due to its high positioning accuracy and convenient operation and maintenance, the electric cylinder is widely used in industrial automation, mechanical equipment, aerospace and other fields.

[0003] Due to the high reverse transmission efficiency of the lead screw auxiliary transmission, energy can be easily recovered, and the lifting device such as an aerial work platform has been expanded. However, the lead screw auxiliary transmission does not have a self-locking function, and in the case of emergency recovery without power, the lifting platform will accelerate to fall due to its own weight, and the falling speed cannot be controlled, which will pose a threat to the health of the operator. The existing lifting device electric cylinder adopts two braking modes of electromagnetic brake and centrifugal brake. The electromagnetic brake is usually integrated with the motor, and the brake is released under power. The centrifugal brake drives the friction lining to contact the brake drum through the centrifugal action of the brake block, and the faster the speed, the greater the braking torque, so as to limit the speed of the electric cylinder within a safe range, which is usually connected with the transmission input shaft of the transmission device.

[0004] In the Chinese utility model patent with the application number CN202320508776.9, a kind of electric cylinder with centrifugal brake is disclosed, wherein the centrifugal brake adopts spring to hold the centrifugal block on the center sleeve, and the outer surface of the centrifugal block is provided with a friction coating layer, which is in frictional contact with the brake drum to generate braking torque.

[0005] In the Chinese utility model patent with the application number CN202320508681.7, a kind of motor with centrifugal brake is disclosed, which integrates the centrifugal brake described in the Chinese utility model patent with the application number CN202320508776.9 with the motor, and is installed at the electromagnetic brake end of the motor.

[0006] In the Chinese utility model patent with the application number CN202121346841.X, a kind of structure using centrifugal brake is disclosed, wherein the friction plate is fixed on the mounting bracket and installed on the transmission shaft through the counterweight block and the sliding pad block by the spring.

[0007] In the Chinese utility model patent with the application number CN202221578132.9, a kind of structure using centrifugal brake is disclosed, wherein the brake block is installed on the rotor by the annular elastic member.

[0008] In the German patent application DE102019105560A, a structure using a centrifugal brake is disclosed, the friction element is composed of a brake pad and a support, the brake pad is fixed on the support, the elastic element holds the friction element tightly, the brake pad contacts with the brake drum to generate braking torque.

[0009] It can be seen that the prior art adopts the mode of using the brake block to generate braking torque by friction between the friction element and the inner surface of the brake drum, and the action surface of the braking torque is in the circumferential direction. The electric cylinder usually needs to be installed with an electromagnetic brake for start-stop control, and the spring is used to press the brake disc to generate braking torque, and the electromagnet is energized to attract the armature to brake and release, and the action direction of the brake is axial. Because the directions of the braking forces of the two types of brakes are different, two components need to be installed respectively, which occupies a large space, and the braking elements of the two brakes need to be maintained respectively, and the maintenance process is complex.

[0010] SUMMARY

[0011] In view of the above problems, the present application provides a centrifugal and electromagnetic double-acting brake and lifting electric cylinder, which saves installation space and only needs to maintain the friction pad at the same place periodically, and the maintenance process is simple.

[0012] In order to achieve the above technical purposes and achieve the above technical effects, the present application realizes the following technical solutions:

[0013] In a first aspect, the present application provides a centrifugal and electromagnetic double-acting brake, comprising:

[0014] A first shaft sleeve is used to connect with a rotating shaft and connect with a brake rotor;

[0015] A friction plate is used to be installed near the brake rotor;

[0016] A centrifugal brake mechanism, when the first shaft sleeve starts to rotate, the centrifugal block in the centrifugal brake mechanism moves outward along the radial direction of the first shaft sleeve, and through the connecting rod, the rotating friction plate is pressed against the structure without circular motion, to generate braking torque on the brake rotor, and the braking torque is positively related to the rotating speed of the rotating shaft, so that the rotating speed of the rotating shaft is controlled within a set value range;

[0017] An electromagnetic brake mechanism, when the electromagnet in the electromagnetic brake mechanism loses power, the rotating friction plate is pressed against the structure without circular motion through the first elastic element, to generate braking torque.

[0018] In combination with the first aspect, optionally, when the electromagnet in the electromagnetic brake mechanism is powered, the first elastic element is in a compressed state, so that the friction plate is separated from the structure without circular motion, and the brake rotor rotates freely with the first shaft sleeve without braking torque.

[0019] Optionally, the non-circumferential motion structure comprises:

[0020] A pressure plate;

[0021] A metal sheet, arranged opposite to the pressure plate, with a gap between the two for placing the friction plate and part of the structure of the brake rotor, the metal sheet being capable of being attracted by an electromagnet;

[0022] A fixed base;

[0023] A second shaft sleeve, one end of which penetrates through the pressure plate and the metal sheet and is connected to the fixed base, and the other end of which is provided with a fixing member.

[0024] Optionally, the centrifugal brake mechanism comprises:

[0025] A centrifugal block mounting shaft, sleeved on the outside of the first shaft sleeve and fixedly connected to the first shaft sleeve, capable of transmitting torque;

[0026] At least two centrifugal blocks, guided in the circumferential direction by a groove on the centrifugal block mounting shaft and positioned in the axial direction by a cover plate, capable of moving in the radial direction of the centrifugal block mounting shaft;

[0027] At least two retainer sleeves, each connected to one end of a corresponding centrifugal block away from the centrifugal block mounting shaft, and each connected by a second elastic member;

[0028] A brake pressure plate, sleeved on the outside of the first shaft sleeve and slidably connected to the first shaft sleeve;

[0029] At least two connecting rods, one end of each connecting rod being connected to a corresponding centrifugal block and the other end of each connecting rod being connected to the brake pressure plate;

[0030] A thrust bearing, one side of which being in contact with the brake pressure plate and the other end of which being in contact with the non-circumferential motion structure.

[0031] Optionally, when the first shaft sleeve rotates, the centrifugal blocks move radially outward under the action of centrifugal force, thereby driving one end of the connecting rod connected thereto to move in the same direction, the other end of the connecting rod driving the brake pressure plate to slide axially on the first shaft sleeve, applying pressure to the thrust bearing, the pressure being transmitted to the pressure plate, the friction plates on both sides of the brake rotor being pressed against the pressure plate and the metal sheet respectively, generating a braking torque.

[0032] Optionally, the brake pressure plate and the first shaft sleeve are connected by a key.

[0033] Optionally, the electromagnetic brake mechanism comprises:

[0034] At least one electromagnet, arranged on the fixed base;

[0035] At least one first elastic member is arranged on the fixed base and is independently arranged from the electromagnet, one end of the first elastic member is in contact with or connected to the fixed base, and the other end is in contact with or connected to the metal sheet.

[0036] In combination with the first aspect, optionally, when the electromagnet loses power, the electromagnetic brake mechanism works, the electromagnet is separated from the metal sheet, the first elastic member pushes the metal sheet, so that the metal sheet and the friction plate and the friction plate and the pressure plate are pressed, and a braking torque is generated; when the electromagnet is powered on, the electromagnetic brake mechanism does not work, the electromagnet attracts the metal sheet to release the brake.

[0037] In the second aspect, the application provides a lifting electric cylinder, comprising:

[0038] A motor;

[0039] A transmission device comprising a transmission input shaft and a transmission output shaft in transmission connection;

[0040] The centrifugal and electromagnetic double-acting brake of any one of the first aspect, the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is rotationally coupled with the transmission input shaft to brake control the transmission input shaft; the transmission input shaft is also connected with the motor shaft of the motor and is driven to rotate by the motor;

[0041] A screw nut pair connected with the transmission output shaft;

[0042] A driving connection part wrapped outside the transmission device and connected with the motor, the centrifugal and electromagnetic double-acting brake, and the screw nut pair, respectively;

[0043] When the motor and the centrifugal and electromagnetic double-acting brake are powered on, the electromagnetic brake mechanism is in a released state, the rotational motion of the motor is transmitted to the screw nut pair through the transmission device, the rotational motion is converted into linear motion by the screw nut pair, and after reaching the set stroke, the motor and the centrifugal and electromagnetic double-acting brake are powered off, at this time the electromagnetic brake mechanism is in a braking state.

[0044] In combination with the second aspect, optionally, when the lifting electric cylinder is in a running state, the electromagnetic brake mechanism is in a released state, the rotation of the transmission input shaft activates the centrifugal brake mechanism, when the rotational speed of the transmission input shaft rises to a set value, the centrifugal brake mechanism is in a braking state, a braking torque is generated, and the rotational speed of the transmission input shaft is controlled within a set range.

[0045] In the third aspect, the application provides a folding electric cylinder, comprising:

[0046] A motor;

[0047] Transmission device, comprising a transmission input shaft and a transmission output shaft in transmission connection;

[0048] The centrifugal and electromagnetic double-acting brake of any one of the first aspect;

[0049] Driving connection part, wrapped outside the transmission device;

[0050] Lead screw nut pair, connected with the transmission output shaft;

[0051] The lead screw nut pair and the motor are arranged side by side, and the two are connected by the driving connection part;

[0052] When the centrifugal and electromagnetic double-acting brake is arranged at the tail end of the motor, the centrifugal and electromagnetic double-acting brake is only connected with the motor shaft of the motor, and the motor shaft of the motor is also connected with the transmission input shaft;

[0053] When the centrifugal and electromagnetic double-acting brake is arranged between the motor and the driving connection part, one end of the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is connected with the motor shaft of the motor, and the other end is connected with the transmission input shaft;

[0054] When the centrifugal and electromagnetic double-acting brake is arranged at a position connected with the driving connection part alone, the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is only connected with the transmission input shaft, and the transmission input shaft is also connected with the motor shaft of the motor.

[0055] In a fourth aspect, the application provides a linear electric cylinder, comprising:

[0056] Motor;

[0057] Transmission device, comprising a transmission input shaft and a transmission output shaft in transmission connection;

[0058] The centrifugal and electromagnetic double-acting brake of any one of the first aspect;

[0059] Driving connection part, wrapped outside the transmission device;

[0060] Lead screw nut pair, connected with the transmission output shaft;

[0061] The lead screw nut pair, the driving connection part and the motor are sequentially installed along the same straight line;

[0062] When the centrifugal and electromagnetic double-acting brake is arranged at the intermediate position of the driving connection part and the motor, one end of the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is connected with the motor shaft of the motor, and the other end is connected with the transmission input shaft;

[0063] When the centrifugal and electromagnetic double-acting brake is arranged at the tail end of the motor, the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is only connected with the motor shaft of the motor, and the motor shaft of the motor is further connected with the transmission input shaft.

[0064] Compared with the prior art, the present application has the following beneficial effects:

[0065] The present application provides a centrifugal and electromagnetic double-acting brake and a lifting electric cylinder. The brake has both a centrifugal braking function for preventing the lifting electric cylinder from running too fast and an electromagnetic braking function of power-off locking, power-on and manual release (i.e. by manually moving the metal sheet, the metal sheet is pressed against the first elastic member, and the friction plate is separated from the pressed state). The brake plays a safety protection role for the operator of the lifting equipment. Compared with the existing braking scheme of the lifting electric cylinder, the present application integrates the separated centrifugal brake and electromagnetic brake, reduces the installation space of the brake in the electric cylinder, and reduces the maintenance complexity of the friction plate. BRIEF DESCRIPTION OF DRAWINGS

[0066] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0067] Fig. 1 is a structural schematic view of a centrifugal and electromagnetic double-acting brake according to an embodiment of the present application;

[0068] Fig. 2 is a centrifugal block installation schematic view according to an embodiment of the present application;

[0069] Fig. 3 is a schematic view of a lifting electric cylinder according to an embodiment of the present application;

[0070] Fig. 4 is a schematic view of a brake installation position of a folding electric cylinder according to an embodiment of the present application;

[0071] Fig. 5 is a schematic view of a brake installation position of a straight-line electric cylinder according to an embodiment of the present application;

[0072] Fig. 6 is a working schematic view of a lifting equipment according to an embodiment of the present application;

[0073] In the figure: 1 - shell, 2 - centrifugal block mounting shaft, 3 - first shaft sleeve, 4 - elastic retainer, 5 - gasket, 6 - bearing, 7 - elastic retainer, 8 - cover plate, 9 - centrifugal block, 10 - retainer, 11 - first pin shaft, 12 - connecting rod, 13 - second pin shaft, 14 - brake pressure plate, 15 - fixed base, 16 - electromagnet, 17 - friction plate, 18 - metal sheet, 19 - pressure plate, 20 - thrust bearing, 21 - brake rotor, 22 - first elastic member, 23 - second shaft sleeve, 24 - flat washer, 25 - screw, 26 - second elastic member, 27 - motor, 28 - transmission input shaft, 29 - centrifugal and electromagnetic double-acting brake, 30 - transmission, 31 - driving connection, 32 - lead screw shaft, 33 - lead screw nut, 34 - piston rod, 35 - lead screw nut pair, 36 - lifting electric cylinder, 37 - lifting mechanism, 38 - operator, 39 - front connection structure. DETAILED DESCRIPTION

[0074] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting on the application or its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0075] Unless specifically stated otherwise, the relative arrangements of the components and steps, numerical expressions, and values shown in the embodiments presented herein are not meant to limit the scope of the present application. It is to be understood that the dimensions of the various parts shown in the drawings are not necessarily to scale, and that for the convenience of description, the dimensions of the various parts shown in the drawings are not necessarily to scale. Techniques, methods, and equipment known to those of ordinary skill can not be discussed in detail because such techniques, methods, and equipment can be known to those of ordinary skill. In appropriate cases, the techniques, methods, and equipment should be considered as part of the description of the application. In all the examples shown and discussed herein, any specific value should be interpreted as merely exemplary, rather than limiting. Therefore, other examples of the exemplary embodiments can also include different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0076] In the description of the present application, if the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0077] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0078] The application principle of the present application will be described in detail below in conjunction with the drawings.

[0079] Embodiment 1

[0080] A centrifugal and electromagnetic double-acting brake is provided in the embodiment of the present application, comprising:

[0081] The first shaft sleeve 3 is used to be connected with the rotating shaft and is used to be connected with the brake rotor 21;

[0082] The friction plate 17 is used to be installed near the brake rotor 21; in the specific implementation process, the number of the friction plate 17 is generally set to 2, and two friction plates 17 are arranged on the two sides of the brake rotor 21 respectively;

[0083] When the first shaft sleeve 3 starts to rotate, the centrifugal block 9 in the centrifugal brake mechanism moves outward along the radial direction of the first shaft sleeve 3, and through the connecting rod 12, the rotating friction plate 17 is pressed against the structure without circular motion, thereby generating a braking torque on the brake rotor 21. The braking torque is in a positive correlation with the rotating speed of the rotating shaft (that is, the higher the rotating speed of the first shaft sleeve 3, the stronger the centrifugal effect, the greater the pressure applied to the friction plate 17, and the greater the braking torque generated), so that the rotating speed of the rotating shaft is controlled within a set value range; in the specific implementation process, when the rotating speed of the rotating shaft increases from 0 to a preset value, the braking torque of the centrifugal brake mechanism is 0; when the rotating speed of the rotating shaft increases to the set value, the centrifugal brake mechanism is in a braking state, and the braking torque is generated; when the rotating speed of the rotating shaft continues to increase, the braking torque and the driving torque reach a balance, and finally the rotating speed of the rotating shaft stabilizes at a value, thereby realizing the control of the rotating speed of the rotating shaft within a set range;

[0084] The electromagnetic brake mechanism generates braking torque by pressing the rotating friction plate 17 and the non-circumferential motion structure through the first elastic member 22 when the electromagnet 16 in the electromagnetic brake mechanism loses power. Specifically, the electromagnetic brake mechanism generates dynamic braking when the first shaft sleeve 3 rotates, and the electromagnetic brake mechanism generates static braking when the first shaft sleeve 3 does not rotate.

[0085] In a specific embodiment of the embodiment of the application, when the electromagnet 16 in the electromagnetic brake mechanism is powered on, the first elastic member 22 is in a compressed state, so that the friction plate 17 is separated from the non-circumferential motion structure, and the brake rotor 21 rotates freely with the first shaft sleeve 3, and there is no braking torque.

[0086] In a specific embodiment of the embodiment of the application, the non-circumferential motion structure comprises:

[0087] The pressure plate 19;

[0088] The metal sheet 18 is arranged opposite to the pressure plate 19, and a gap between the two is used to place the friction plate 17 and part of the structure of the brake rotor 21. The metal sheet 18 can be attracted by the electromagnet 16. In a specific implementation process, the metal sheet 18 can be selected as an armature.

[0089] The fixed base 15;

[0090] The second shaft sleeve 23, one end of which penetrates through the pressure plate 19 and the metal sheet 18 and is connected to the fixed base 15, and the other end is provided with a fixing member, which can be selected as a screw 25 in a specific implementation process. That is, the pressure plate 19 and the metal sheet 18 are circumferentially fixed to the fixed base 15 through the second shaft sleeve 23 and the screw 25, and cannot rotate around the axis. The second shaft sleeve 23 can be selected as a hollow shaft sleeve.

[0091] In a specific embodiment of the embodiment of the application, the centrifugal brake mechanism comprises:

[0092] The centrifugal block mounting shaft 2 is sleeved outside the first shaft sleeve 3 and fixedly connected to the first shaft sleeve 3;

[0093] The at least two centrifugal blocks 9 are guided in the circumferential direction by the groove on the centrifugal block mounting shaft 2, positioned in the axial direction by the cover plate 8, and can move in the radial direction of the centrifugal block mounting shaft 2 to ensure braking balance.

[0094] The at least two retainer cages 10 are respectively connected to one end of the corresponding centrifugal blocks 9 away from the centrifugal block mounting shaft 2; and the retainer cages 10 are connected through the second elastic member 26.

[0095] The brake pressure plate 14 is sleeved outside the first shaft sleeve 3 and slidably connected to the first shaft sleeve 3.

[0096] at least two connecting rods 12, one end of the connecting rod 12 is connected with the corresponding centrifugal block 9, the other end is connected with the brake pressure plate 14; in the specific implementation process, the two ends of the connecting rod 12 are connected with the corresponding centrifugal block 9 and brake pressure plate 14 respectively through the first pin shaft 11 and the second pin shaft 13 respectively;

[0097] a thrust bearing 20, one side of the thrust bearing 20 is in contact with the brake pressure plate 14, the other end is in contact with the non-circumferential motion structure, specifically, the other end of the thrust bearing 20 is in contact with the pressure plate 19.

[0098] In a specific embodiment of the embodiment of the application, when the first shaft sleeve 3 rotates, the centrifugal block 9 moves outward along the radial direction under the action of centrifugal force, and further drives one end of the connecting rod 12 connected thereto to move in the same direction, the other end of the connecting rod 12 drives the brake pressure plate 14 to slide axially on the first shaft sleeve 3, the connecting rod 12 drives the brake pressure plate 14 to apply pressure to the thrust bearing 20, the pressure is transmitted to the pressure plate 19, and the friction plates 17 on both sides of the brake rotor 21 are pressed against the pressure plate 19 and the metal sheet 18 respectively, thereby generating a braking torque.

[0099] In a specific embodiment of the embodiment of the application, the brake pressure plate 14 is connected with the first shaft sleeve 3 by a key.

[0100] In a specific embodiment of the embodiment of the application, the electromagnetic brake mechanism comprises:

[0101] at least one electromagnet 16, the electromagnet 16 is arranged on the fixed base 15;

[0102] at least one first elastic member 22, the first elastic member 22 is arranged on the fixed base 15, and is independently arranged with the electromagnet 16, one end of the first elastic member 22 is in contact with or connected with the fixed base 15, the other end is in contact with or connected with the metal sheet 18. In the specific implementation process, the fixed base 15 is provided with two grooves for mounting the electromagnet 16 and the first elastic member 22 respectively.

[0103] In a specific embodiment of the embodiment of the application, when the electromagnet 16 loses power, the electromagnetic brake mechanism works, the electromagnet 16 is separated from the metal sheet 18, the first elastic member 22 pushes the metal sheet 18, so that the metal sheet 18 and the friction plate 17 and the friction plate 17 and the pressure plate 19 are pressed, thereby generating a braking torque; when the electromagnet 16 is powered on, the electromagnetic brake mechanism does not work, the electromagnet 16 attracts the metal sheet 18 to release the brake.

[0104] The centrifugal and electromagnetic double-acting brake in the embodiment of the application will be described in detail below in combination with a specific embodiment.

[0105] The centrifugal and electromagnetic double-acting brake adopts the embodiment shown in Fig. 1, which comprises a housing 1, a centrifugal block mounting shaft 2, a first shaft sleeve 3, an elastic retainer 4, a gasket 5, a bearing 6, an elastic retainer 7, a cover plate 8, a centrifugal block 9, a retainer 10, a first pin shaft 11, a connecting rod 12, a second pin shaft 13, a brake pressure plate 14, a fixed base 15, an electromagnet 16, a friction plate 17, a metal sheet 18 (in a specific implementation, an armature can be selected), a pressure plate 19, a thrust bearing 20, a brake rotor 21, a first elastic member 22 (in a specific implementation, a compression spring can be selected), a second shaft sleeve 23 (in a specific implementation, a hollow shaft sleeve can be selected), a flat washer 24, a screw 25, and a second elastic member 26. The pressure plate 19 and the metal sheet 18 are circumferentially fixed with the fixed base 15 through the second shaft sleeve 23 and the screw 25 and cannot rotate around the axis. The brake rotor 21 is keyed connected (in a specific implementation, a spline connection can be selected) with the first shaft sleeve 3. When the electromagnet 16 loses power, the first elastic member 22 will press the metal sheet 18 and the friction plate 17 and the friction plate 17 and the pressure plate 19, thereby generating a braking torque. When the electromagnet 16 is powered or manually released (i.e., by manually moving the metal sheet 18 to press the first elastic member 22 so that the friction plate 17 is separated from the pressed state), the spring force of the first elastic member 22 is overcome, the friction plate 17 is separated from the brake pressure plate 14 and the metal sheet 18, and the brake rotor 21 rotates freely with the first shaft sleeve 3, at which time there is no braking torque. The centrifugal block mounting shaft 2 is rigidly fixed with the first shaft sleeve 3, and the centrifugal block 9 is mounted on the centrifugal block mounting shaft 2 and is axially positioned by the front and rear cover plates 8 and can move in the radial direction. When the first shaft sleeve 3 rotates, the centrifugal block 9 moves outward in the radial direction under the action of centrifugal force, and the retainer 10 fixed thereto drives the first pin shaft 11 to move in the same direction. The brake pressure plate 14 is spline connected with the first shaft sleeve 3 and can slide axially on the first shaft sleeve 3. Then, after the first pin shaft 11 moves outward in the radial direction, the brake pressure plate 14 is pushed to the right side to apply pressure through the connecting rod 12 and the second pin shaft 13. The pressure is transmitted to the pressure plate 19 through the thrust bearing 20, the friction plate 17 on both sides of the brake rotor 21 is pressed against the pressure plate 19 and the metal sheet 18, respectively, a braking torque is generated, and the speed is reduced. The higher the speed, the stronger the centrifugal force, and the greater the pressure applied to the friction plate, the greater the braking torque generated, thereby controlling the speed of the first shaft sleeve 3 to a set value.

[0106] The centrifugal block mounting is shown in Fig. 2. The retainer 10 presses the centrifugal block 9 in the groove of the centrifugal block mounting shaft 2, and the second elastic member 26 fixes the retainers 10 tightly to each other. The centrifugal block 9 can slide in the radial direction in the groove of the centrifugal block mounting shaft 2 and is axially positioned by the cover plates 8. The centrifugal block mounting shaft 2 is rigidly fixed with the first shaft sleeve 3, and no relative movement occurs between them.

[0107] Example 2

[0108] The lifting electric cylinder provided in the embodiment of the application comprises:

[0109] The motor 27;

[0110] The transmission device 30 comprises a transmission input shaft 28 and a transmission output shaft (not shown in the figure) in transmission connection;

[0111] The centrifugal and electromagnetic double-acting brake 29 described in Embodiment 1, the first shaft sleeve 3 of the centrifugal and electromagnetic double-acting brake is rotationally coupled with the transmission input shaft 28 (i.e., the rotating shaft) of the transmission device 30, and the transmission input shaft 28 is controlled by the centrifugal and electromagnetic double-acting brake; the transmission input shaft 28 is also connected with the motor shaft of the motor 27 and is driven to rotate by the motor 27;

[0112] The driving connection part 31 is wrapped outside the transmission device 30 and is connected with the motor 27, the centrifugal and electromagnetic double-acting brake 29 and the screw nut pair 35 respectively;

[0113] When the motor 27 and the centrifugal and electromagnetic double-acting brake 29 are powered on, the electromagnetic brake mechanism is in a released state, the rotary motion of the motor 27 is transmitted to the screw nut pair 35 through the transmission device 30, the rotary motion is converted into linear motion by the screw nut pair 35, and after reaching the set stroke, the motor 27 and the centrifugal and electromagnetic double-acting brake 29 are powered off, at which time the electromagnetic brake mechanism is in a braking state.

[0114] In a specific implementation of the embodiment of the application, when the lifting electric cylinder is in a running state, the electromagnetic brake mechanism is in a released state, and the rotation of the transmission input shaft 28 activates the centrifugal brake mechanism; when the rotating speed of the transmission input shaft 28 increases from 0 to a preset value, the braking torque of the centrifugal brake mechanism is 0; when the rotating speed of the transmission input shaft 28 increases to a set value, the centrifugal brake mechanism is in a braking state and generates a braking torque; when the rotating speed of the transmission input shaft 28 continues to increase, the braking torque and the driving torque reach a balance, and finally the rotating speed of the transmission input shaft 28 stabilizes at a value, so that the rotating speed of the transmission input shaft 28 is controlled within a set range.

[0115] In the specific implementation process, the motor shaft, the transmission input shaft 28 and the first shaft sleeve 3 of the centrifugal and electromagnetic double-acting brake 29 in the embodiment of the application are connected by the commonly used fixed connection mode of key connection or shaft coupling connection, so as to keep the rotating speeds of the three consistent.

[0116] The schematic diagram of the lifting electric cylinder is shown in Fig. 3. The screw nut pair 35 comprises a screw shaft 32, a screw nut 33, an external cylinder, a piston rod 34, front and rear cylinder covers, etc. The motor 27 and the centrifugal and electromagnetic double-acting brake 29 are installed on the driving connection part 31 of the electric cylinder, and are rotationally coupled with the transmission input shaft 28 of the transmission device 30 to brake and control the transmission input shaft 28. After the motor 27 and the centrifugal and electromagnetic double-acting brake 29 are powered on, the electromagnetic brake is released, the rotational movement of the motor 27 is transmitted to the screw shaft 32 through the transmission device 30, and then the rotational movement is converted into linear movement through the screw nut 33 to push the piston rod 34 to drive the front connecting structure 39 to move outward. When the set stroke is reached, the motor 27 and the centrifugal and electromagnetic double-acting brake 29 are powered off, and the electromagnetic brake is reset to brake. When the lifting electric cylinder is in operation, the electromagnetic brake is in a released state, and the rotation of the transmission input shaft 28 activates the centrifugal brake function to generate a braking torque to control the rotation speed of the transmission input shaft 28 within a set range.

[0117] The working schematic diagram of the lifting device is shown in Fig. 6. The front and rear hinge points of the lifting electric cylinder 36 are installed on different arm supports of the lifting mechanism 37. The piston rod 34 of the lifting electric cylinder 36 is extended to push the lifting mechanism 37 to lift the operator 38. Conversely, when the lifting mechanism 37 falls back, the piston rod 34 of the lifting electric cylinder 36 needs to be retracted. When the operator 38 is at a high position and needs to be recovered in a non-powered state, the electromagnetic brake of the centrifugal and electromagnetic double-acting brake 29 is released in a manual release mode. The lifting mechanism 37 falls back by itself due to the gravity of the self weight and the operator 38. As the rotation speed of the transmission input shaft 28 inside the lifting electric cylinder 36 increases, the centrifugal brake of the centrifugal and electromagnetic double-acting brake 29 is activated to control the rotation speed of the transmission input shaft 28 within a set value, preventing the lifting mechanism 37 from falling too fast to cause health hazards to the operator 38.

[0118] Embodiment 3

[0119] As shown in Fig. 4, the embodiment of the present application provides a folding electric cylinder, which comprises:

[0120] a motor 27;

[0121] a transmission device 30, comprising a transmission input shaft 28 (i.e. a rotating shaft) and a transmission output shaft (not shown in the figure) connected in transmission;

[0122] the centrifugal and electromagnetic double-acting brake 29 described in Embodiment 1;

[0123] a driving connection part 31 wrapped outside the transmission device 30;

[0124] a screw nut pair 35 connected with the transmission output shaft;

[0125] The lead screw nut pair 35 is arranged side by side with the motor 27, and the two are connected by the driving connection part 31.

[0126] When the centrifugal and electromagnetic double-acting brake 29 is arranged at the tail end of the motor 27 (i.e. at ① in FIG. 4), the centrifugal and electromagnetic double-acting brake 29 is connected only with the motor shaft of the motor 27, and the motor shaft of the motor 27 is further connected with the transmission input shaft 28.

[0127] When the centrifugal and electromagnetic double-acting brake 29 is arranged between the motor 27 and the driving connection part 31 (i.e. at ② in FIG. 4), one end of the first shaft sleeve 3 of the centrifugal and electromagnetic double-acting brake 29 is connected with the motor shaft of the motor 27, and the other end is connected with the transmission input shaft 28.

[0128] When the centrifugal and electromagnetic double-acting brake 29 is arranged at a position separately connected with the driving connection part 31 (i.e. at ③ in FIG. 4), the first shaft sleeve 3 of the centrifugal and electromagnetic double-acting brake 29 is connected only with the transmission input shaft 28, and the transmission input shaft 28 is further connected with the motor shaft of the motor 27.

[0129] In the specific implementation process, the motor shaft, the transmission input shaft 28, and the first shaft sleeve 3 of the centrifugal and electromagnetic double-acting brake 29 in the embodiment of the application are connected by the commonly used fixed connection mode of key connection or shaft coupling connection, so as to keep the rotation speeds of the three consistent.

[0130] Embodiment 4

[0131] As shown in FIG. 5, the embodiment of the application provides a linear electric cylinder, which comprises:

[0132] a motor 27;

[0133] a transmission device 30, comprising a transmission input shaft 28 (i.e. a rotating shaft) and a transmission output shaft (not shown in the figure) connected in transmission;

[0134] the centrifugal and electromagnetic double-acting brake 29 described in Embodiment 1;

[0135] a driving connection part 31, wrapped outside the transmission device 30;

[0136] a lead screw nut pair 35, connected with the transmission output shaft;

[0137] The lead screw nut pair 35, the driving connection part 31, and the motor 27 are sequentially installed along the same straight line.

[0138] Because the starting rotation speed of the centrifugal and electromagnetic double-acting brake 29 due to the centrifugal effect is usually required to be large, the centrifugal and electromagnetic double-acting brake 29 is arranged at a position between the driving connection part 31 and the motor 27 or at the tail end of the motor 27.

[0139] When the centrifugal and electromagnetic double-acting brake 29 is arranged at the middle position between the driving connection part 31 and the motor 27 (i.e. at ④ in FIG. 5), one end of the first shaft sleeve 3 of the centrifugal and electromagnetic double-acting brake 29 is connected with the motor shaft of the motor 27, and the other end is connected with the transmission input shaft 28;

[0140] When the centrifugal and electromagnetic double-acting brake 29 is arranged at the tail end of the motor 27 (i.e. at ⑤ in FIG. 5), the first shaft sleeve 3 of the centrifugal and electromagnetic double-acting brake 29 is only connected with the motor shaft of the motor 27, and the motor shaft of the motor 27 is also connected with the transmission input shaft 28.

[0141] In the specific implementation process, the motor shaft, the transmission input shaft 28 and the first shaft sleeve 3 of the centrifugal and electromagnetic double-acting brake 29 in the embodiment of the present application are connected by the commonly used fixed connection mode of key connection or shaft coupling connection, so as to keep the rotation speeds of the three consistent.

[0142] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the protection scope of the present application.

[0143] The basic principles and main features of the present application and the advantages of the present application have been shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A centrifugal and electromagnetic double-acting brake, characterized in that, The utility model relates to a kind of centrifugal brake mechanism and electromagnetic brake mechanism, comprising: First shaft sleeve, for being connected with rotating shaft, and for being connected with brake rotor; Friction plate, for being installed near brake rotor; When the first shaft sleeve starts to rotate, centrifugal block in the centrifugal brake mechanism moves along the radial direction of the first shaft sleeve, and the rotating friction plate is pressed against the structure without circular motion by connecting rod, to generate braking torque to brake rotor, and the braking torque is positively correlated with the rotating speed of rotating shaft, so that the rotating speed of rotating shaft is controlled within the set value range; When the electromagnet in the electromagnetic brake mechanism loses power, the rotating friction plate is pressed against the structure without circular motion by first elastic member, to generate braking torque.

2. A centrifugal and electromagnetic double acting brake according to claim 1, characterized in that: When the electromagnet in the electromagnetic brake mechanism is powered on, the first elastic member is in a compressed state, so that the friction plate is separated from the structure without circular motion, and the brake rotor rotates freely with the first shaft sleeve without braking torque.

3. A centrifugal and electromagnetic double acting brake according to claim 1, characterized in that: The structure without circular motion comprises: Pressure plate; Metal sheet, oppositely arranged with the pressure plate, and the gap between the two is used to place part of the structure of the friction plate and the brake rotor, and the metal sheet can be attracted by the electromagnet; Fixed base; Second shaft sleeve, one end of which penetrates through the pressure plate and the metal sheet and is connected with the fixed base, and the other end is provided with a fixing member.

4. A centrifugal and electromagnetic double acting brake according to claim 3, characterized in that The centrifugal brake mechanism comprises: Centrifugal block mounting shaft, which is sleeved outside the first shaft sleeve and fixedly connected with the first shaft sleeve, and can transmit torque; At least two centrifugal blocks, which are guided in the circumferential direction by the groove on the centrifugal block mounting shaft and positioned in the axial direction by the cover plate, and can move in the radial direction of the centrifugal block mounting shaft; At least two retainer sleeves, each of which is connected with one end of the corresponding centrifugal block away from the centrifugal block mounting shaft, and each of which is connected by a second elastic member; Brake pressure plate, which is sleeved outside the first shaft sleeve and slidably connected with the first shaft sleeve; At least two connecting rods, one end of each of which is connected with the corresponding centrifugal block, and the other end of each of which is connected with the brake pressure plate; Thrust bearing, one side of which is in contact with the brake pressure plate, and the other end of which is in contact with the structure without circular motion.

5. A centrifugal and electromagnetic double acting brake according to claim 4, characterized in that: When the first shaft sleeve rotates, the centrifugal block moves outward in the radial direction under the action of centrifugal force, and in turn drives one end of the connecting rod connected therewith to move in the same direction, and the other end of the connecting rod drives the brake pressure plate to slide axially on the first shaft sleeve, to apply pressure to the thrust bearing, and the pressure is transmitted to the pressure plate, to press the friction plates on both sides of the brake rotor against the pressure plate and the metal sheet respectively, to generate braking torque.

6. A centrifugal and electromagnetic double acting brake according to claim 4, characterized in that: The brake pressure plate and the first shaft sleeve are connected by a key.

7. A centrifugal and electromagnetic double acting brake according to claim 3, characterized in that: The electromagnetic brake mechanism comprises: At least one electromagnet, which is arranged on the fixed base; At least one first elastic member, which is arranged on the fixed base and independently arranged with the electromagnet, one end of which is in contact with or connected with the fixed base, and the other end of which is in contact with or connected with the metal sheet.

8. A centrifugal and electromagnetic double acting brake according to claim 6, characterized in that: When the electromagnet loses power, the electromagnetic brake mechanism works, the electromagnet separates from the metal sheet, the first elastic member pushes the metal sheet, so that the metal sheet and the friction sheet and the friction sheet and the pressure plate are pressed, and a braking torque is generated; when the electromagnet is powered on, the electromagnetic brake mechanism does not work, the electromagnet attracts the metal sheet to brake and release.

9. A lifting electro-cylinder, characterized by It comprises: a motor; a transmission device comprising a transmission input shaft and a transmission output shaft in transmission connection; the centrifugal and electromagnetic double-acting brake of any one of claims 1-8, the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is rotationally coupled with the transmission input shaft to brake control the transmission input shaft; the transmission input shaft is also connected with the motor shaft of the motor and is driven to rotate by the motor; a screw nut pair connected with the transmission output shaft; a drive connection part wrapped outside the transmission device and connected with the motor, the centrifugal and electromagnetic double-acting brake and the screw nut pair respectively; When the motor and the centrifugal and electromagnetic double-acting brake are powered on, the electromagnetic brake mechanism is in a released state, the rotational movement of the motor is transmitted to the screw nut pair through the transmission device, and the rotational movement is converted into linear movement by the screw nut pair, and after reaching the set stroke, the motor and the centrifugal and electromagnetic double-acting brake are powered off, at this time the electromagnetic brake mechanism is in a braking state.

10. A lifting electro-cylinder according to claim 9, characterized in that When the lifting electric cylinder is in a running state, the electromagnetic brake mechanism is in a released state, and the rotation of the transmission input shaft activates the centrifugal brake mechanism, when the rotational speed of the transmission input shaft rises to a set value, the centrifugal brake mechanism is in a braking state, a braking torque is generated, and the rotational speed of the transmission input shaft is controlled within a set range.

11. A folding electric cylinder, characterized by It comprises: a motor; a transmission device comprising a transmission input shaft and a transmission output shaft in transmission connection; the centrifugal and electromagnetic double-acting brake of any one of claims 1-8; a drive connection part wrapped outside the transmission device; a screw nut pair connected with the transmission output shaft; the screw nut pair and the motor are arranged side by side, and the two are connected by the drive connection part; When the centrifugal and electromagnetic double-acting brake is arranged at the tail end of the motor, the centrifugal and electromagnetic double-acting brake is only connected with the motor shaft of the motor, and the motor shaft of the motor is also connected with the transmission input shaft; When the centrifugal and electromagnetic double-acting brake is arranged between the motor and the drive connection part, one end of the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is connected with the motor shaft of the motor, and the other end is connected with the transmission input shaft; When the centrifugal and electromagnetic double-acting brake is arranged in a position connected with the drive connection part alone, the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is only connected with the transmission input shaft, and the transmission input shaft is also connected with the motor shaft of the motor.

12. A linear electric cylinder characterized by It comprises: a motor; a transmission device comprising a transmission input shaft and a transmission output shaft in transmission connection; the centrifugal and electromagnetic double-acting brake of any one of claims 1-8; a drive connection part wrapped outside the transmission device; a screw nut pair connected with the transmission output shaft; the screw nut pair, the drive connection part and the motor are installed in sequence along the same straight line; When the centrifugal and electromagnetic double-acting brake is arranged at the middle position between the driving connection part and the motor, one end of the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is connected with the motor shaft of the motor, and the other end is connected with the transmission input shaft; When the centrifugal and electromagnetic double-acting brake is arranged at the tail end of the motor, the first shaft sleeve of the centrifugal and electromagnetic double-acting brake is only connected with the motor shaft of the motor, and the motor shaft of the motor is also connected with the transmission input shaft.

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