CN219210223U - Brake mechanism, safety protection device and crusher - Google Patents

Abstract

The utility model provides a braking mechanism, a safety protection device and a crusher, relates to the technical field of mechanical equipment, and solves the technical problem that in the prior art, after the crusher is powered off, a counterweight wheel needs to wait for continuing to rotate for a long time, so that the working efficiency is reduced. The braking mechanism comprises a braking part, a supporting part and a base, wherein the braking part is erected and rotatably connected above the supporting part, the first end of the supporting part is rotatably connected with the base, the second end of the supporting part is a free end, the supporting part can be rotated and lifted around the first end of the supporting part, so that the braking part is contacted with a wheel body, the friction between the wheel body and the braking part is utilized to play a role in braking, the rotation time of a counterweight wheel is reduced after the breaking machine is powered off, the working efficiency of the whole cleaning or maintaining process is improved, and meanwhile, the potential safety hazard of a user in using other articles to stop the wheel body of the machine is also eliminated. The utility model also provides a safety protection device with the brake mechanism and a crusher.

Description

Brake mechanism, safety protection device and crusher

Technical Field

The utility model relates to the technical field of mechanical equipment, in particular to a braking mechanism, a safety protection device and a crusher.

Background

Crushers, also known as lithotripters, are crushing machines used in the processing of metallic and non-metallic ores that crush mined raw ore into small particles by extrusion, bending, etc.

Referring to the prior patent CN 201410010684.3-crusher and cn20090101416. X-crusher, after the crusher is used, the inner cavity of the crusher body needs to be cleaned or maintained by opening a protecting member such as a protecting plate, so as to clean out residues in the inner cavity, and in order to stabilize the rotation speed of the load, the crusher and other machines are generally provided with a counterweight wheel, which is also an inertia wheel, however, after the crusher is powered off, the counterweight wheel continues to rotate for a period of time under the action of inertia, and if the crusher is waited to stop automatically, a period of time is wasted.

Moreover, the crusher is powered off only by virtue of the main switch, and the power-off protection device is not arranged at the front end of the main switch, so that the condition that the crusher is suddenly started to hurt people due to the fact that the crusher is suddenly started automatically or the crusher is accidentally touched by the personnel due to the switch failure in the process of cleaning the crusher by the personnel is easily caused.

Therefore, how to solve the technical problem that in the prior art, after the breaker is powered off, the counterweight wheel needs to wait for a long time to continue rotating, and the working efficiency is reduced has become an important technical problem that needs to be solved by the person in the field.

Disclosure of Invention

The utility model aims to provide a brake mechanism, a safety protection device and a crusher, which solve the technical problems that in the prior art, after the crusher is powered off, a counterweight wheel needs to wait for continuous rotation for a long time, and the working efficiency is reduced. The preferred technical solutions of the technical solutions provided by the present utility model can produce a plurality of technical effects described below.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a brake mechanism which comprises a brake piece, a support piece and a base, wherein the brake piece is erected and rotatably connected above the support piece, a first end of the support piece is rotatably connected with the base, a second end of the support piece is a free end, and the support piece can be lifted up and rotated around the first end of the support piece so as to enable the brake piece to be in contact with a wheel body to be decelerated.

Further, the brake piece is of an arc-shaped structure, and the radial dimension of the brake piece is equal to or larger than the outer diameter of the wheel body to be decelerated.

Further, the brake piece comprises a braking plate and a wear-resistant layer, wherein the wear-resistant layer is laminated and compositely paved on the upper portion of the braking plate.

Further, including set up in the brake piece with rotate connection structure between the support piece, rotate connection structure including first bellying, second bellying and round pin axle, first bellying set up in the bottom of brake piece, the second bellying set up in the upper portion of support piece, the round pin axle runs through first bellying with the second bellying is fastened.

Further, the support further comprises a holding part which is convenient to hold, and the holding part is arranged at the second end of the support.

The utility model provides a safety protection device which is used for preventing a machine from being started by mistake, the machine comprises a protection plate, the protection plate comprises a travel switch, a connecting piece and the brake mechanism, the travel switch is arranged on a base, a trigger end of the travel switch is positioned above a supporting piece, the travel switch is connected with a main switch piece of the machine in series, a first end of the connecting piece is connected with the supporting piece, a second end of the connecting piece is connected with the protection plate, the protection plate is started, and the connecting piece drives the supporting piece to lift up so as to trigger the travel switch to be in an off state.

Further, the connecting piece is a folding rod type structure, the connecting piece comprises a first rod body and a second rod body, the first rod body and the second rod body are connected with each other in a rotating mode, the second end of the first rod body is connected with the protection plate in a rotating mode, and the second end of the second rod body is connected with the supporting piece in a rotating mode.

Further, the travel switch comprises a fixed part and a trigger part which are connected in a rotating way, the fixed part is connected with the base, the trigger part is a free end, and a movable distance is arranged between the trigger part and the supporting piece;

when the supporting piece is lifted up to brake the wheel body to be decelerated, the supporting piece is lifted up or falls down in the movable space, and the triggering part is not contacted with the supporting piece; when the protection plate is opened to drive the supporting piece to lift, the movable range of the supporting piece exceeds the movable distance, and the supporting piece is contacted with the triggering part to trigger the travel switch to be in a disconnection state.

The crusher provided by the utility model comprises the safety protection device.

Further, the breaker comprises a switch circuit component for adjusting the switch state of the breaker, wherein the switch circuit component comprises a shutdown switch piece, a startup switch piece, a travel switch, a contactor and a magnetic attraction switch piece, the shutdown switch piece, the startup switch piece, the travel switch and the contactor are connected in series, and the magnetic attraction switch piece is connected in parallel with the startup switch piece.

Compared with the prior art, the utility model has the following beneficial effects:

according to the braking mechanism provided by the utility model, the braking piece, the supporting piece and the base are arranged, the braking piece is erected and rotatably connected above the supporting piece, the first end of the supporting piece is rotatably connected with the base, the second end of the supporting piece is a free end, and the supporting piece can be lifted up and rotated around the first end of the supporting piece so as to enable the braking piece to be in contact with the wheel body to be decelerated. When the wheel body needs to be decelerated, a user can lift the second end of the supporting piece upwards, the friction force between the wheel body and the brake piece is utilized to play a role in braking, the rotation time of the counterweight wheel is greatly reduced after the breaker is powered off, the working efficiency of the whole cleaning or maintenance process is improved, and meanwhile, the potential safety hazard that the user uses other objects to stop the wheel body of the machine is eliminated.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram illustrating the positional relationship between a safety device, a protection plate and a wheel body according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a brake mechanism according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a position relationship between a brake mechanism and a travel switch according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a rotational connection structure according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a connector provided by an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a travel switch provided by an embodiment of the present utility model;

fig. 7 is a schematic diagram of a switching circuit assembly according to an embodiment of the present utility model.

1-a brake piece in the drawing; 2-a support; 3-a base; 4-braking plates; 5-a wear layer; 6-a first boss; 7-a second boss; 8-a pin shaft; 9-a grip; 10-travel switch; 11-a connector; 12-a first rod body; 13-a second rod body; 14-a fixing part; 15-a trigger part; 16-a shutdown switch; 17-a start-up switch; 18-contactors; 19-magnetic switch piece; 20-wheel body; 21-guard plates; 22-a rotational connection.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.

The utility model aims to provide a brake mechanism, a safety protection device and a crusher, which solve the technical problems that in the prior art, after the crusher is powered off, a counterweight wheel needs to wait for continuous rotation for a long time, and the working efficiency is reduced.

Hereinafter, embodiments will be described with reference to the drawings. Furthermore, the embodiments shown below do not limit the summary of the utility model described in the claims. The whole contents of the constitution shown in the following examples are not limited to the solution of the utility model described in the claims.

The technical scheme of the utility model is described in detail below with reference to specific examples.

Example 1:

referring to fig. 1-4, the braking mechanism provided in this embodiment includes a braking member 1, a supporting member 2 and a base 3, wherein the braking member 1 is mounted and rotatably connected above the supporting member 2, and the connection may be, but not limited to, a hinge connection or a rotation shaft connection, and the braking member 1 may be mounted at a middle position of the supporting member 2. The base 3 can be fixed on the ground or on the casing of the machine, so as to provide a bearing point for the movement of the support 2. The first end of the support member 2 is rotatably connected to the base 3 so that the support member 2 can be rotatably lifted or lowered relative to the base 3. The connection between the support 2 and the base 3 may be, but is not limited to, a hinged or hinged connection. The second end of support piece 2 is the free end for the operation is held by the user, support piece 2 can rotate around self first end and lift, so that brake piece 1 contacts with the wheel body 20 of waiting to slow down, so set up, brake mechanism can set up in the wheel body 20 of counter weight wheel below position of waiting to slow down, when wheel body 20 needs to slow down, the user can lift up support piece 2's second end, utilize the frictional force between wheel body 20 and brake piece 1 to play the effect of brake, and the user can lift up support piece 2 to different elevations according to the use needs, so that obtain the frictional force of different degree between wheel body 20 and the brake piece 1, brake service scenario is nimble changeable more, greatly reduced the breaker outage back, the rotation duration of counter weight wheel has improved the work efficiency of clean or maintenance whole process, the potential safety hazard that the wheel body 20 exists of user's using other article stopper has also been eliminated simultaneously after the breaker is cut off, need wait for counter weight wheel to continue rotation for a longer time in the prior art, reduce work efficiency's technical problem.

As an alternative implementation manner of the embodiment of the present utility model, the brake member 1 is in an arc structure, the radial dimension of the brake member 1 is adapted to the outer diameter of the wheel body 20 to be decelerated, specifically, the radial dimension of the brake member 1 is equal to or greater than the outer diameter of the wheel body 20 to be decelerated, and in this way, when the support member 2 is lifted upwards, the brake member 1 can be gradually attached to the lower circumferential direction of the wheel body 20, compared with a flat plate structure, the brake member 1 is designed to be in an arc structure, so that the contact area between the brake member 1 and the lateral circumferential direction of the wheel body 20 is greatly increased, and a larger friction force can be formed between the brake member 1 and the wheel body 20, so that the wheel body 20 can finish rotating more rapidly.

Referring to fig. 2, as an alternative implementation manner of the embodiment of the present utility model, the brake member 1 includes a braking plate 4 and a wear-resistant layer 5, where the wear-resistant layer 5 is laminated and compositely laid on the upper portion of the braking plate 4, and the wear-resistant layer 5 may be made of elastic wear-resistant material, alternatively, but not limited to rubber, silica gel or silicone rubber, so that the wear-resistant layer 5 and the wheel body 20 may be flexibly matched, so as to reduce impact force between the two, and the wear-resistant layer 5 can play a role of buffering and damping between the wheel body 20 and the braking plate 4, and the wear-resistant layer 5 has good wear-resistant performance and can bear continuous friction of the wheel body 20.

Referring to fig. 2 to 4, as an alternative implementation of the embodiment of the present utility model, the brake mechanism includes a rotational connection structure 22, and the rotational connection structure 22 is disposed between the brake member 1 and the support member 2, so as to enable rotational support of the brake member 1 on the support member 2. Wherein the rotational connection 22 may be provided at a middle position of the support 2 and the brake 1. The rotary connection structure 22 comprises a first protruding portion 6, a second protruding portion 7 and a pin shaft 8, the first protruding portion 6 is fixedly arranged at the bottom of the brake piece 1, the second protruding portion 7 is fixedly arranged at the upper portion of the support piece 2, one or at least two first protruding portions 6 and at least two second protruding portions 7 can be arranged in parallel along the axial direction of the pin shaft 8, optionally, any one of the first protruding portions 6 can be arranged between every two adjacent second protruding portions 7, namely, the first protruding portions 6 and the second protruding portions 7 can be arranged in a staggered mode so as to be supported on the side portions of each other. The round pin axle 8 runs through and carries out both ends fastening behind first bellying 6 and the second bellying 7, so set up, and first bellying 6, second bellying 7 and round pin axle 8 all set up along the width direction of brake piece 1 and support piece 2, and first bellying 6 and second bellying 7 can prop up brake piece 1 from support piece 2's surface, make brake piece 1 can obtain bigger rotation range of motion, rotate through round pin axle 8 moreover and erect, rotate in a flexible way and can bear great pressure.

Further, the brake mechanism can further comprise an elastic piece, two ends of the elastic piece are respectively connected with the brake piece 1 and the support piece 2, and the elastic piece can be respectively arranged on two sides of the rotary connecting structure 22, so that the brake piece 1 can be limited, excessive left and right shaking of the brake piece 1 is avoided, and when the brake piece 1 is attached to the wheel body 20, the elastic piece can elastically support two sides of the brake piece 1, and can also press the brake piece 1 to a certain degree, so that the brake piece 1 is attached to the wheel body 20 more.

As an alternative implementation manner of the embodiment of the present utility model, the brake mechanism further includes a holding portion 9 that is convenient to hold, and the holding portion 9 is disposed at the second end of the support member 2, where the holding portion 9 may be, but is not limited to, a handle or a hand wheel, and can be more easily held by a user by a hand, so that the support frame can be lifted and dropped conveniently, and the holding operation is more comfortable.

Example 2:

referring to fig. 1-6, the safety protection device provided in this embodiment is used for preventing a machine from being started by mistake, the machine includes a protection plate 21, and it should be noted that the protection plate 21 is a self-structure of the machine, the protection plate 21 refers to a plate-shaped or cover-shaped structure for protecting a working part of the machine when the machine works normally, and the protection plate 21 needs to be opened to clean or maintain the interior of the machine, the safety protection device includes a travel switch 10, a connecting piece 11 and the brake mechanism, the travel switch 10 is disposed on the base 3, and a trigger end of the travel switch 10 is located above the support 2 so as to facilitate lifting and triggering of the support 2. The travel switch 10 is connected in series with the main switch element of the machine so that the machine will not be started to operate even if the main switch element is turned on by mistake after the travel switch 10 is triggered to be turned off. The first end of connecting piece 11 is connected with support piece 2, and the second end of connecting piece 11 is connected with guard plate 21, and guard plate 21 opens, and connecting piece 11 drives support piece 2 to lift to trigger travel switch 10 and be in the disconnected state, so set up, when need to maintain or clean the machine, the user can close the main switch of machine and outage, then lifts the support piece 2 of brake mechanism, makes brake piece 1 and the counter weight wheel contact friction of machine, thereby makes the counter weight wheel can stop fast, has greatly practiced thrift waiting time. After the counterweight wheel stops, when the protection plate 21 is opened by a user, the support piece 2 is driven to be lifted greatly through the connecting piece 11, the support piece 2 can rotate to the position of the travel switch 10, the travel switch 10 is triggered, the travel switch 10 is in a disconnection state, so that a circuit of a main switch connected in series with the travel switch 10 is always in a disconnection state, even if the main switch breaks down or other personnel touch and start by mistake, the machine can always keep a power-off stop state in the cleaning or maintenance process, and the potential safety hazard that the machine is mistakenly started to hurt people is avoided.

Referring to fig. 1-2 and 5, as an alternative implementation of the embodiment of the present utility model, the connection member 11 is of a folding bar type structure, and of course, the connection member 11 may be designed to be of a rope type structure according to the use requirement, so as to perform flexible traction. The connecting piece 11 includes first body of rod 12 and the second body of rod 13 that first end is rotated and is connected, the second end of first body of rod 12 is rotated with guard plate 21 and is connected, the second end of second body of rod 13 is rotated with support piece 2 and is connected, between first body of rod 12 and the second body of rod 13, the connection between first body of rod 12 and the guard plate 21 and between second body of rod 13 and support piece 2 can be but is not limited to articulated, so set up, the connecting piece 11 can be the cooperation mechanism of multistage folding rod, in the in-process of carrying out the lift to support piece 2, also reducible support piece 2's excessive displacement deformation, and carry to hold in the palm through folding member, in-process or carry hold in place after also can playing certain support effect to support piece 2. It should be noted that, during cleaning or maintenance, the protection plate 21 is opened to drive the counterweight wheel to lift synchronously, or the supporting member 2 may also slightly shift laterally under the pulling action of the connecting member 11, so that the counterweight wheel may be avoided during the lifting process.

Referring to fig. 1-3 and fig. 6, as an alternative implementation manner of the embodiment of the present utility model, the travel switch 10 includes a fixed portion 14 and a trigger portion 15 that are rotatably connected, specifically, the fixed portion 14 and the trigger portion 15 may be connected by a rotating member such as a damping shaft, so that the trigger portion 15 may rotate upwards relative to the fixed portion 14 under the lifting triggering action of the supporting member 2. An elastic member may be disposed between the triggering portion 15 and the fixing portion 14 or between the triggering portion 15 and the base 3, which may be, but not limited to, a column spring or a torsion spring, so that when the supporting member 2 falls, the triggering portion 15 may also return to the original position under the action of the restoring deformation of the elastic member, and wait for the re-triggering of the supporting member 2. The fixed part 14 is connected with the base 3, the triggering part 15 is a free end, and a movable distance is arranged between the triggering part 15 and the supporting piece 2, wherein the movable distance can be set to be the height distance between the triggering part 15 corresponding to the lifting and rotating included angle of 10 degrees of the supporting piece 2 relative to the base 3 and the supporting piece 2 contacts with the triggering part 15 when the lifting and rotating included angle of the supporting piece 2 relative to the base 3 exceeds 10 degrees, and the travel switch 10 is triggered.

When the support member 2 lifts up to brake the wheel body 20 to be decelerated, the support member 2 lifts up or falls down within the movable interval, and the trigger portion 15 is not in contact with the support member 2, that is, the travel switch 10 may not be triggered when the support member 2 lifts up the brake member 1 to brake, and the support member 2 may repeatedly brake the wheel body 20 within the movable interval. When the protection plate 21 is opened to drive the supporting piece 2 to lift, the movable range of the supporting piece 2 exceeds the movable distance, and the supporting piece 2 is contacted with the triggering part 15 to trigger the travel switch 10 to be in a disconnection state, namely when the inner cavity of the machine needs to be maintained or cleaned, the protection plate 21 is opened, and the supporting piece 2 can be driven to lift to trigger the travel switch 10, so that the maintenance and cleaning process of a user is safer.

Example 3:

referring to fig. 1 to 7, the crusher provided in this embodiment includes the safety protection device, when the crusher needs to be maintained or cleaned, a user can turn off the main switch of the crusher, and then lift the support member 2 of the brake mechanism, so that the brake member 1 contacts and rubs with the counterweight wheel of the crusher, thereby enabling the counterweight wheel to stop rapidly, and greatly saving waiting time. After the counterweight wheel stops, when the protection plate 21 is opened by a user, the support piece 2 is driven to be lifted greatly through the connecting piece 11, the support piece 2 can rotate to the position of the travel switch 10, the travel switch 10 is triggered, the travel switch 10 is in a disconnection state, so that a circuit of a main switch connected with the travel switch 10 in series is always in a disconnection state, even if the main switch breaks down or other personnel touch and start by mistake, the crusher can always keep a power-off stop state in the cleaning or maintenance process, and the potential safety hazard that the crusher is injured by the false start is avoided.

Referring to fig. 7, as an alternative implementation of the embodiment of the present utility model, the crusher includes a switch circuit assembly for adjusting the switch state of the crusher, the switch circuit assembly includes a shutdown switch member 16, a startup switch member 17, a travel switch 10, a contactor 18, and a magnetic attraction switch member 19, the shutdown switch member 16, the startup switch member 17, the travel switch 10, and the contactor 18 are connected in series, the magnetic attraction switch member 19 is connected in parallel with the startup switch member 17, and in particular, the switch circuit assembly is a switch control circuit of the crusher, which is connected in series on a working circuit of the crusher. When the switch piece 16, the start switch piece 17, the travel switch 10 and the contactor 18 are communicated, or the switch piece 16, the magnetic switch piece 19, the travel switch 10 and the contactor 18 are communicated, the contactor 18 can be triggered, and the contactor 18 enables a power supply which is a power supply for a motor to be communicated, so that the crusher is started. The switch 16 is normally connected, the switch 17 is normally disconnected, and the magnetic switch 19 is normally disconnected. The travel switch 10 can be turned off in a period of cleaning the crusher, and after the crushing cavity is closed by a user after cleaning is finished, the travel switch 10 is restored to the original position and kept in a communicated state.

When the crushing cavity of the crusher is closed and started, the travel switch 10 is connected, the shutdown switch piece 16 is connected, the point-contact starting switch piece 17 is connected, so that electricity can be supplied between the L1 and the L2, the L1 and the L2 can refer to two ends of a working circuit of the crusher, the contactor 18 is powered on to drive the crusher to start, the magnetic attraction switch piece 19 is powered on to generate magnetic attraction connection, and the starting switch piece 17 can be automatically disconnected at the moment. When the machine is turned off, the turning-off switch piece 16 is touched, the turning-off switch piece 16 is turned off, the travel switch 10 is turned off, the power between L1 and L2 is off, the power of the crusher is stopped, the magnetic attraction switch piece 19 is turned off, and the magnetic attraction switch piece 19 is turned off. When the crusher is cleaned, the travel switch 10 is disconnected, and the crusher cannot be started no matter the main switch breaks down or a person carelessly touches the main switch button, so that the use is safer. The switch circuit assembly can also comprise an overload protector, wherein the overload protector can be connected with the shutdown switch piece 16, the startup switch piece 17, the travel switch 10 and the contactor 18 in series, and the overload protector is connected in a normal state and can be disconnected to play a protection role when overload occurs in the circuit.

In the description of the present utility model, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not 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 should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a brake mechanism, its characterized in that includes brake piece (1), support piece (2) and base (3), the brake piece (1) erect and rotatable coupling is in the top of support piece (2), the first end of support piece (2) with base (3) are rotated and are connected, the second end of support piece (2) is the free end, support piece (2) can rotate around self first end and lift up, so that brake piece (1) contacts with wheel body (20) of waiting to slow down.

2. The brake mechanism according to claim 1, characterized in that the brake member (1) has an arc-shaped structure, and the radial dimension of the brake member (1) is equal to or larger than the outer diameter of the wheel body (20) to be decelerated.

3. Brake mechanism according to claim 1, characterized in that the brake element (1) comprises a braking plate (4) and a wear layer (5), the wear layer (5) being laminated and compositely laid on top of the braking plate (4).

4. The brake mechanism according to claim 1, comprising a rotational connection structure (22) arranged between the brake member (1) and the support member (2), wherein the rotational connection structure (22) comprises a first protruding portion (6), a second protruding portion (7) and a pin shaft (8), the first protruding portion (6) is arranged at the bottom of the brake member (1), the second protruding portion (7) is arranged at the upper portion of the support member (2), and the pin shaft (8) penetrates through the first protruding portion (6) and the second protruding portion (7) to be fastened.

5. Brake mechanism according to claim 1, further comprising a grip portion (9) for facilitating gripping, said grip portion (9) being arranged at the second end of the support member (2).

6. Safety device for prevent that machine from starting by mistake, the machine includes guard plate (21), its characterized in that, including travel switch (10), connecting piece (11) and the brake mechanism of any one of claims 1-5, travel switch (10) set up in on base (3), just the trigger end of travel switch (10) is located support piece (2) top, travel switch (10) with the main switch piece of machine is established ties mutually, the first end of connecting piece (11) with support piece (2) are connected, the second end of connecting piece (11) with guard plate (21) are connected, guard plate (21) are opened, connecting piece (11) drive support piece (2) are lifted, in order to trigger travel switch (10) are in the off state.

7. The safety device according to claim 6, wherein the connecting member (11) is of a folding rod type structure, the connecting member (11) comprises a first rod body (12) and a second rod body (13) which are rotatably connected at a first end, a second end of the first rod body (12) is rotatably connected with the protection plate (21), and a second end of the second rod body (13) is rotatably connected with the supporting member (2).

8. The safety device according to claim 6, characterized in that the travel switch (10) comprises a fixed part (14) and a triggering part (15) which are rotatably connected, the fixed part (14) is connected with the base (3), the triggering part (15) is a free end, and a movable distance is arranged between the triggering part (15) and the supporting piece (2);

when the supporting piece (2) lifts up to brake the wheel body (20) to be decelerated, the supporting piece (2) lifts up or falls down in the movable space, and the triggering part (15) is not contacted with the supporting piece (2); when the protection plate (21) is opened to drive the supporting piece (2) to be lifted, the movable range of the supporting piece (2) exceeds the movable distance, and the supporting piece (2) is contacted with the triggering part (15) to trigger the travel switch (10) to be in a disconnection state.

9. A crusher comprising a safety shield apparatus as claimed in any one of claims 6 to 8.

10. The crusher according to claim 9, characterized by comprising a switching circuit assembly for adjusting the crusher switching state, the switching circuit assembly comprising a shut-off switch piece (16), a start-up switch piece (17), a travel switch (10), a contactor (18) and a magnetically attracted switch piece (19), the shut-off switch piece (16), the start-up switch piece (17) and the travel switch (10), the contactor (18) being connected in series, the magnetically attracted switch piece (19) being connected in parallel with the start-up switch piece (17).

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