Pneumatic mechanical emergency brake mechanism

Abstract

The present application belongs to diesel engine technical field, especially relate to a kind of pneumatic mechanical emergency brake mechanism, comprising: executor group, executor group includes the shell that is enclosed to accommodate cavity, and the valve stem that is slidably connected with shell and is connected in accommodating cavity, the first end of valve stem forms execution push part, further include first elastic structure for being arranged in accommodating cavity interior for pushing execution push part to stretch out in the direction of being away from shell, fixed block being fixed on the stem body portion of valve stem located in accommodating cavity interior;Locking piece, installed on shell, there is the limiting structure that can be combined / detached between the end portion of locking piece inserted in accommodating cavity interior and fixed block;Second elastic structure, for driving locking piece reset;And cylinder group, for pushing limiting structure to separate.The pneumatic mechanical emergency brake mechanism of the present application solves the problems that existing throttle control mechanism cannot quickly realize emergency braking and cannot realize emergency braking through intelligent control.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of diesel engines, and particularly relates to a pneumatic mechanical emergency brake mechanism. BACKGROUND

[0002] At present, diesel engines are widely applied to provide power for transport vehicles, ships, engineering machinery and agricultural machinery, and many diesel engines are adjusted in output power by adjusting the size of the throttle opening through a throttle control mechanism. The throttle control mechanism is provided with an automatic adjusting rocker arm and a handle operating assembly, and can realize automatic / manual adjustment of the throttle.

[0003] The existing throttle control mechanism is adjusted to a small size through the handle operating assembly until the diesel engine stops when the diesel engine encounters emergency situations such as overspeed, cylinder seizure, shaft seizure and abnormal operation parameters. The above operation needs a certain reaction time and operation time, and the operation is slow and cannot quickly realize emergency braking, and cannot realize emergency braking through intelligent control, which seriously affects the safety of the diesel engine itself and also damages other equipment. SUMMARY

[0004] The technical problem to be solved by the application is to provide a pneumatic mechanical emergency brake mechanism, which aims to solve the problems that the existing throttle control mechanism cannot quickly realize emergency braking and cannot realize emergency braking through intelligent control.

[0005] The application discloses a pneumatic mechanical emergency brake mechanism applied to a throttle control mechanism of a diesel engine, and has the characteristics that the pneumatic mechanical emergency brake mechanism comprises:

[0006] an actuator group, which comprises a shell enclosing a containing cavity, a valve rod in sliding connection with the shell and penetrating the containing cavity, a first end portion of the valve rod forming an execution pushing portion, a first elastic structure arranged inside the containing cavity and used for pushing the execution pushing portion to stretch away from the shell, and a fixed block fixed to a rod body portion of the valve rod inside the containing cavity;

[0007] a locking piece mounted to the shell, and a limiting structure capable of being combined and separated is arranged between an end portion of the locking piece inserted into the containing cavity and the fixed block;

[0008] a second elastic structure used for driving the locking piece to reset;

[0009] a cylinder group used for pushing the limiting structure between the locking piece and the fixed block to separate;

[0010] When the diesel engine is running, the execution pushing part is in a falling state, and the limiting structure between the locking piece and the fixed block is combined together; when the emergency brake is applied, the cylinder group pushes the locking piece to act so as to separate the limiting structure between the locking piece and the fixed block, and the elastic force of the first elastic structure pushes the execution pushing part to extend away from the shell, so as to push the handle operating assembly of the throttle control mechanism to rotate and close the throttle to achieve emergency braking.

[0011] As an improvement, the valve rod penetrates the accommodating cavity, and a second end of the valve rod is arranged outside the shell and is fixed with a detection device.

[0012] As an improvement, the fixed block is arranged at a side of the valve rod close to the execution pushing part, and the first elastic structure is sleeved on the valve rod between the fixed block and a side of the accommodating cavity away from the execution pushing part.

[0013] As an improvement, the shell comprises an upper shell surrounding a cylinder, an upper end of the upper shell is closed, a lower end of the upper shell is provided with a cylinder opening, and an upper mounting hole is arranged at the upper end of the upper shell; a lower cover is arranged at the lower end of the upper shell, the lower cover is provided with a lower mounting hole corresponding to the upper mounting hole, and an accommodating cavity is surrounded between the upper shell and the lower cover; the valve rod is connected in series with the upper mounting hole and the lower mounting hole, and the first elastic structure is sleeved on the valve rod between the fixed block and the lower cover.

[0014] As an improvement, the fixed block comprises a large-diameter cylindrical part arranged at a side close to the execution pushing part, a small-diameter cylindrical part fixed at a side of the large-diameter cylindrical part away from the execution pushing part, and a step is formed at the abutting position of the large-diameter cylindrical part and the small-diameter cylindrical part; a support sleeve sleeved on the valve rod is fixed on the lower cover, a space is arranged between the inner side wall of the support sleeve and the valve rod, and the support sleeve is inserted into the cylinder opening; the first elastic structure comprises a first compression spring supported between the step and the support sleeve, and a second compression spring arranged inside the first compression spring, and the second compression spring is supported between the small-diameter cylindrical part and the lower cover at the inner ring side of the support sleeve.

[0015] As an improvement, the inner diameter of the cylinder surrounded by the upper shell is greater than the inner diameter of the cylinder opening, a transition connection part is formed between the inner side wall of the cylinder surrounded by the upper shell and the cylinder opening, a space is arranged between the end of the support sleeve inserted into the cylinder opening and the transition connection part, and the first compression spring is inserted into the inside of the cylinder opening.

[0016] As an improvement, the locking piece is arranged as a rocker arm rotatably mounted on the shell, comprising a first arm body and a second arm body fixedly connected, an obtuse angle alpha is arranged between the first arm body and the second arm body, the second arm body is inserted into the accommodating cavity, and the limiting structure is arranged between the second arm body and the fixed block.

[0017] As an improvement, the large-diameter cylindrical portion is arranged as an inclined surface away from the side of the small-diameter cylindrical portion, a bayonet is arranged at the end of the second arm body inserted into the accommodating cavity, and the limiting structure is formed between the bayonet and the inclined surface.

[0018] As an improvement, the cylinder group is fixedly connected with the shell, the piston rod of the cylinder group abuts against the lower side of the first arm body, and the second elastic structure is connected between the first arm body and the cylinder group.

[0019] As an improvement, the lower cover is fixedly connected with a mounting plate, the mounting plate is connected with the lower cover in an integrated structure, and the cylinder group is fixed to the mounting plate.

[0020] After the above technical scheme is adopted, the beneficial effects of the present application are as follows.

[0021] During installation, the pneumatic mechanical emergency brake mechanism is arranged on the lower side of the handle operating assembly, the execution pushing part of the valve rod is arranged opposite to the handle operating assembly, the cylinder group is connected with the air supply device, and the air supply device is electrically connected with the electronic control system of the diesel engine.

[0022] When the diesel engine appears an operation abnormality, the electronic control system controls the air supply device to ventilate the cylinder group according to the received detection signal, the cylinder group pushes the locking piece to act so as to separate the limiting structure between the locking piece and the fixed block, and the elastic force of the first elastic structure can quickly push the execution pushing part of the valve rod to move away from the shell, thereby pushing the handle operating assembly of the throttle control mechanism to rotate to close the throttle, and emergency braking can be quickly realized.

[0023] After the abnormality is eliminated, the execution pushing part of the valve rod falls back, since the fixed block is fixed to the valve rod, the fixed block can be synchronously moved to the locking piece, the limiting structure between the locking piece and the fixed block is combined together, the execution pushing part of the valve rod is in a falling back state, and a space is arranged between the execution pushing part of the valve rod and the handle operating assembly, so that the execution pushing part of the valve rod does not affect the rotation of the handle operating assembly.

[0024] The pneumatic mechanical emergency brake mechanism of the embodiment of the present application solves the problems that the existing throttle control mechanism cannot quickly realize emergency braking and cannot realize emergency braking through intelligent control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is a schematic diagram of the three-dimensional structure of the pneumatic mechanical emergency brake mechanism according to an embodiment of the present invention;

[0026] Figure 2 1 is a schematic cross-sectional view of a pneumatic mechanical emergency brake mechanism according to an embodiment of the present invention;

[0027] Figure 3 1. It is a schematic diagram of the three-dimensional structure of the pneumatic mechanical emergency brake mechanism in the braking state according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the pneumatic mechanical emergency brake mechanism in use according to an embodiment of the present invention;

[0029] Among them, 11. valve stem; 12. fixing block; 121. large diameter cylindrical portion; 122. small diameter cylindrical portion; 123. inclined surface; 13. first compression spring; 14. second compression spring; 15. upper shell; 151. transition connection portion; 16. lower cover; 17. mounting plate; 18. support sleeve; 20. rocker arm; 21. first arm body; 22. second arm body; 23. bayonet; 30. cylinder; 31. mounting sleeve; 40. return spring; 50. detection device; 60. transmission shaft assembly; 61. automatic adjustment rocker arm; 62. connecting rocker arm; 70. throttle lever; 81. connecting seat; 82. rotating shaft; 83. input rocker arm; 84. output rocker arm; 85. first connecting rod; 86. second connecting rod; 87. third connecting rod; 90. handle operation assembly; 91. manual rocker arm; 92. handle; 93. emergency brake screw. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] Figures 1 to 4 Schematic diagram of the structure of the pneumatic mechanical emergency brake mechanism according to an embodiment of the present invention, wherein: Figure 1 FIG2 shows a schematic diagram of the three-dimensional structure of the pneumatic mechanical emergency brake mechanism according to an embodiment of the present invention. Figure 2 FIG2 shows a cross-sectional structural diagram of a pneumatic mechanical emergency brake mechanism according to an embodiment of the present invention. Figure 3 The figure shows a three-dimensional structural diagram of the pneumatic mechanical emergency brake mechanism in the braking state according to an embodiment of the present invention. Figure 4 The figure shows a schematic diagram of the pneumatic mechanical emergency brake mechanism in use according to an embodiment of the present invention. For ease of description, only the parts related to the present invention are shown in the figure.

[0032] It should be noted that the directional indications involved in the present invention (such as up, down, front, back, etc.) are only used to explain the relative positional relationship between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly; if the descriptions of "first", "second", etc. involved in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0033] like Figures 1 to 4 As shown, an embodiment of the present invention discloses a pneumatic mechanical emergency brake mechanism, which is applied to a throttle control mechanism of a diesel engine, comprising:

[0034] An actuator assembly includes a housing that encloses an accommodating cavity, a valve stem 11 that is slidably connected to the housing and penetrates the accommodating cavity of the housing, a first end of the valve stem 11 forming an actuator push portion, a first elastic structure disposed within the accommodating cavity for pushing the actuator push portion of the valve stem 11 away from the housing, and a fixing block 12 fixed to the stem portion of the valve stem 11 located within the accommodating cavity;

[0035] A locking member is mounted on the housing, and a limiting structure capable of engagement / separation is provided between the end of the locking member inserted into the accommodating cavity and the fixing block 12;

[0036] The second elastic structure is used to drive the locking member to reset;

[0037] and a cylinder group for pushing the limiting structure between the locking member and the fixing block 12 to separate;

[0038] When the diesel engine is running, the actuator push portion of the valve stem 11 is in a falling state, and the limiting structure between the locking member and the fixed block 12 is combined together, such as Figure 2 As shown; during emergency braking, the cylinder group pushes the locking member to separate the limiting structure between the locking member and the fixed block 12, and the elastic force of the first elastic structure pushes the actuator of the valve stem 11 to extend away from the housing, such as Figure 3 As shown, the handle operating assembly 90 that can push the throttle control mechanism is rotated to close the throttle to achieve emergency braking.

[0039] For ease of understanding, combined Figure 4 The following describes the settings of the diesel engine's throttle control mechanism and pneumatic mechanical emergency brake mechanism:

[0040] The throttle control mechanism of the diesel engine comprises a transmission shaft assembly 60, two groups of throttle pull rods 70 respectively arranged at two end portions of the transmission shaft assembly 60, an automatic adjusting rocker 61 and a handle operating assembly 90 fixed to one end portion of the transmission shaft assembly 60, and a connecting rocker 62 fixed to the other end portion of the transmission shaft assembly 60, and a connecting seat assembly is arranged between the handle operating assembly 90, the connecting rocker 62 and the throttle pull rod 70 on the corresponding side, wherein the automatic adjusting rocker 61 is connected with a speed regulator (not shown in the figure), and the throttle pull rod 70 is connected with a rack of an injection pump; the connecting seat assembly comprises a connecting seat 81, a rotating shaft 82 rotatably installed on the connecting seat 81, and an input rocker 83 and an output rocker 84 respectively fixed to two end portions of the rotating shaft 82; a first connecting rod 85 is arranged between the output rocker 84 and the throttle pull rod 70, and two end portions of the first connecting rod 85 are rotatably connected with the output rocker 84 and the throttle pull rod 70 respectively; a second connecting rod 86 is arranged between the handle operating assembly 90 and the input rocker 83 on the corresponding side, and two end portions of the second connecting rod 86 are rotatably connected with the handle operating assembly 90 and the input rocker 83 on the corresponding side respectively; a third connecting rod 87 is arranged between the connecting rocker 62 and the input rocker 83 on the corresponding side, and two end portions of the third connecting rod 87 are rotatably connected with the connecting rocker 62 and the input rocker 83 on the corresponding side respectively; when adjusting the throttle, whether the throttle is automatically adjusted through the automatic adjusting rocker 61 or manually adjusted through the handle operating assembly 90, both groups of throttle pull rods 70 can be simultaneously and synchronously moved in the same direction.

[0041] When installed, the pneumatic mechanical emergency brake mechanism is arranged below the handle operating assembly 90, the execution pushing portion of the valve rod 11 is arranged opposite to the handle operating assembly 90, the air cylinder group is connected with an air supply device, and the air supply device is electrically connected with an electronic control system of the diesel engine; when the diesel engine operates, the execution pushing portion of the valve rod 11 is in a falling-back state, and a spacing is arranged between the execution pushing portion of the valve rod 11 and the handle operating assembly 90.

[0042] When the diesel engine operates abnormally, the electronic control system controls the air supply device to ventilate the air cylinder group according to the received detection signal, the air cylinder group pushes the locking member to act so as to separate the limiting structure between the locking member and the fixed block 12, the elastic force of the first elastic structure can quickly push the execution pushing portion of the valve rod 11 to move away from the housing, thereby pushing the handle operating assembly 90 of the throttle control mechanism to rotate and close the throttle, and the emergency brake can be quickly realized.

[0043] After the abnormal situation is excluded, the execution pushing part of the valve rod 11 is returned, and since the fixed block 12 is fixed to the valve rod 11, the fixed block 12 can be synchronously moved to the locking part along with the valve rod 11, the limiting structure between the locking part and the fixed block 12 is combined together, the execution pushing part of the valve rod 11 is in a returned state, and a spacing is provided between the execution pushing part of the valve rod 11 and the handle operating assembly 90, so that the execution pushing part of the valve rod 11 does not affect the rotation of the handle operating assembly 90.

[0044] The pneumatic mechanical emergency brake mechanism of the embodiment of the present application solves the problems that the existing throttle control mechanism cannot quickly realize emergency braking and cannot realize emergency braking through intelligent control.

[0045] In order to facilitate installation and manual adjustment, the handle operating assembly 90 comprises a manual rocker arm 91 fixed to the end of the transmission shaft assembly 60, a handle 92 fixed to the manual rocker arm 91, and an emergency brake screw 93 fixedly installed on the manual rocker arm 91 at a position corresponding to the valve rod 11, so as to facilitate contact with the valve rod 11.

[0046] In the embodiment of the present application, the valve rod 11 penetrates the accommodating cavity of the shell, the second end of the valve rod 11 is arranged outside the shell, and the detector 50 is fixed to the second end of the valve rod 11, which is electrically connected to the electronic control system of the diesel engine and is used for detecting the movement state of the valve rod 11, thereby facilitating intelligent control.

[0047] Generally, the detector 50 is a displacement sensor, and of course, can also be a distance sensor.

[0048] Specifically, the fixed block 12 is arranged at the side of the valve rod 11 close to the execution pushing part, and the first elastic structure is sleeved on the valve rod 11 between the fixed block 12 and the side of the accommodating cavity away from the execution pushing part. Generally, the first elastic structure is a compression spring.

[0049] As shown in Figure 1 , Figure 2 and Figure 3 , the shell comprises an upper shell 15 surrounding a cylinder, the upper end of the upper shell 15 is closed, the lower end is provided with a cylinder opening, and the upper mounting hole is arranged at the upper end of the upper shell 15; the lower cover 16 is arranged at the lower end of the upper shell 15, the lower cover 16 is provided with a lower mounting hole corresponding to the upper mounting hole, and the accommodating cavity is surrounded between the upper shell 15 and the lower cover 16; the valve rod 11 is connected in series with the upper mounting hole and the lower mounting hole, and the first elastic structure is sleeved on the valve rod 11 between the fixed block 12 and the lower cover 16.

[0050] Further, the fixed block 12 comprises a large-diameter cylindrical portion 121 arranged close to the actuating pushing portion, a small-diameter cylindrical portion 122 fixed to the large-diameter cylindrical portion 121 away from the actuating pushing portion, and a step formed at the joint of the large-diameter cylindrical portion 121 and the small-diameter cylindrical portion 122; a support sleeve 18 is fixed to the lower cover 16 and sleeved on the valve rod 11, and a gap is arranged between the inner side wall of the support sleeve 18 and the valve rod 11, the support sleeve 18 is inserted into the barrel mouth of the upper shell 15; the first elastic structure comprises a first compression spring 13 supported between the step and the support sleeve 18, and a second compression spring 14 arranged in the first compression spring 13, the second compression spring 14 is supported between the small-diameter cylindrical portion 122 and the part of the lower cover 16 at the inner ring side of the support sleeve 18, so as to enhance the elastic force and drive the actuating pushing portion of the valve rod 11 to extend away from the shell more quickly. Correspondingly, an annular groove is arranged on the lower cover 16, and the support sleeve 18 is inserted into the annular groove.

[0051] As shown in Figure 2 and Figure 3 The inner diameter of the barrel body surrounded by the upper shell 15 is larger than the inner diameter of the barrel mouth of the upper shell 15, a transition connecting portion 151 is formed between the inner side wall of the barrel body surrounded by the upper shell 15 and the barrel mouth, a gap is arranged between the end portion of the support sleeve 18 inserted into the barrel mouth and the transition connecting portion 151, and the first compression spring 13 is inserted into the inside of the barrel mouth, so as to limit the first compression spring 13 and avoid the deflection of the first compression spring 13.

[0052] In order to facilitate the combination / separation of the limiting structure between the locking piece and the fixed block 12, the side of the large-diameter cylindrical portion 121 away from the small-diameter cylindrical portion 122 is arranged as an inclined surface 123, a bayonet 23 is arranged on the locking piece, and a limiting structure is formed between the bayonet 23 and the inclined surface 123.

[0053] In the embodiment of the present application, the locking piece is arranged as a rocker arm 20 rotatably installed on the shell, comprising a first arm body 21 and a second arm body 22 fixedly connected, an obtuse angle α is arranged between the first arm body 21 and the second arm body 22, for example, the angle α can be arranged as 110 degrees, 120 degrees, etc., the second arm body 22 is inserted into the accommodating cavity, the bayonet 23 is arranged at the end portion of the second arm body 22 inserted into the accommodating cavity, and a limiting structure is formed between the bayonet 23 and the inclined surface 123 of the large-diameter cylindrical portion 121. Generally, two mounting rings are arranged at intervals on the upper shell 15, the connection portion of the first arm body 21 and the second arm body 22 is rotatably installed between the two mounting rings, a notch is arranged on the upper shell 15 between the two mounting rings, so as to facilitate the insertion of the second arm body 22 into the accommodating cavity.

[0054] As shown in Figure 1As shown, the cylinder group is fixedly connected with the shell, and the piston rod of the cylinder group abuts against the lower side of the first arm body 21; the second elastic structure is connected between the first arm body 21 and the cylinder group, and generally, the second elastic structure is a return spring 40.

[0055] After the cylinder 30 is cut off, the pushing force of the piston rod of the cylinder 30 disappears, the return spring 40 pulls the rocker arm 20 to rotate, under the extrusion of the first arm body 21 and the gravity of the rocker arm 20, the piston and the piston rod of the cylinder 30 fall back, and under the pulling of the return spring 40, the first arm body 21 is always supported on the piston rod of the cylinder 30; after the braking is completed, the valve rod 12 needs to be reset, that is, the valve rod 12 is pressed downward by external force until the fixed block 12 moves to the end of the second arm body 22 of the rocker arm 20 inserted into the accommodating cavity, so that the limiting structures are combined together, and after the piston and the piston rod of the cylinder 30 fall back, under the limitation of the piston rod of the cylinder 30, the rocker arm 20 no longer rotates, the position of the fixed block 12 can be limited, so that the execution pushing part of the valve rod 11 is kept in the falling back state.

[0056] In order to facilitate installation, the lower cover 16 is fixedly connected with a mounting plate 17, and the cylinder group is fixed to the mounting plate 17, and generally, the mounting plate 17 is connected with the lower cover 16 in an integral structure.

[0057] Specifically, the cylinder group includes the cylinder 30, a mounting sleeve 31 arranged between the cylinder 30 and the mounting plate 17, and at least two connecting bolts arranged between the mounting plate 17, the mounting sleeve 31 and the lower end cover of the cylinder 30.

[0058] As shown in the figure, Figure 1 As shown, the second elastic structure is connected between the first arm body 21 and the mounting sleeve 31 of the cylinder group; generally, the fixing screws are arranged on the first arm body 21 and the mounting sleeve 31 respectively, and the second elastic structure is arranged between the fixing screw on the first arm body 21 and the fixing screw on the mounting sleeve 31.

[0059] The above is an example of the best embodiment of the present application, wherein the parts not described in detail are all the common knowledge of ordinary skilled in the art. The protection scope of the present application is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present application is also within the protection scope of the present application.

Claims

1. A pneumatic mechanical emergency brake mechanism applied to a throttle control mechanism of a diesel engine, characterized by, The utility model relates to a kind of emergency brake device, including: Actuator group, the actuator group includes the shell that the accommodation cavity is enclosed, with the shell sliding connection and the valve stem (11) that is inserted in the accommodation cavity, the first end of the valve stem (11) forms execution push part, further including first elastic structure for pushing the execution push part to stretch out in the direction away from the shell, fixed block (12) for being located in the rod body portion of the valve stem (11) inside the accommodation cavity; Locking piece, installed in the shell, between the end portion of the locking piece inserted inside the accommodation cavity and the fixed block (12) there is the limiting structure that can be combined / separated; Second elastic structure, for driving the locking piece reset; And cylinder group, for pushing the limiting structure between the locking piece and the fixed block (12) separates; When diesel engine operates, the execution push part is in the state of falling back, the limiting structure between the locking piece and the fixed block (12) is combined together;When emergency braking, the cylinder group pushes the locking piece action to make the limiting structure between the locking piece and the fixed block (12) separate, the elastic force of the first elastic structure pushes the execution push part to stretch out in the direction away from the shell, can push the handle operating assembly (90) of the throttle control mechanism rotation and close throttle to realize emergency braking.

2. The pneumatic mechanical emergency brake mechanism according to claim 1, wherein The valve stem (11) penetrates the accommodation cavity, the second end of the valve stem (11) is arranged outside the shell, and the detector (50) is fixed on the second end of the valve stem (11).

3. The pneumatic mechanical emergency brake mechanism of claim 2, wherein, The fixed block (12) is arranged on the side of the valve stem (11) close to the execution push part, and the first elastic structure is sleeved on the valve stem (11) between the fixed block (12) and the side of the accommodation cavity away from the execution push part.

4. The pneumatic mechanical emergency brake mechanism as defined in claim 3, wherein The shell includes the upper shell (15) enclosing the cylinder, the upper end of the upper shell (15) is closed, the lower end is provided with a cylinder port, and the upper mounting hole is arranged on the upper end of the upper shell (15).

5. The pneumatic mechanical emergency brake mechanism as defined in claim 4, wherein The fixed block (12) comprises a large-diameter cylindrical part (121) arranged near the execution pushing part, a small-diameter cylindrical part (122) fixed to the large-diameter cylindrical part (121) away from the execution pushing part, and a step formed at the joint of the large-diameter cylindrical part (121) and the small-diameter cylindrical part (122); a support sleeve (18) is fixed on the lower cover (16) and sleeved on the valve rod (11), a gap is arranged between the inner side wall of the support sleeve (18) and the valve rod (11), and the support sleeve (18) is inserted into the cylinder opening; the first elastic structure comprises a first compression spring (13) supported between the step and the support sleeve (18), and a second compression spring (14) arranged in the first compression spring (13), wherein the second compression spring (14) is supported between the small-diameter cylindrical part (122) and the lower cover (16) on the inner ring side of the support sleeve (18).

6. The pneumatic mechanical emergency brake mechanism of claim 5, wherein, The inner diameter of the cylinder surrounded by the upper shell (15) is greater than the inner diameter of the cylinder opening, a transition connecting part (151) is formed between the inner side wall of the cylinder surrounded by the upper shell (15) and the cylinder opening, a gap is arranged between the end of the support sleeve (18) inserted into the cylinder opening and the transition connecting part (151), and the first compression spring (13) is inserted into the cylinder opening.

7. The pneumatic mechanical emergency brake mechanism as defined in claim 5 wherein, The locking member is arranged to be rotatably installed on the rocker arm (20) of the shell, comprises a first arm body (21) and a second arm body (22) fixedly connected, an obtuse angle α is arranged between the first arm body (21) and the second arm body (22), the second arm body (22) is inserted into the accommodating cavity, and the limiting structure is arranged between the second arm body (22) and the fixed block (12).

8. The pneumatic mechanical emergency brake mechanism of claim 7, wherein, The side of the large-diameter cylindrical part (121) away from the small-diameter cylindrical part (122) is arranged as an inclined surface (123), a bayonet (23) is arranged at the end of the second arm body (22) inserted into the accommodating cavity, and the limiting structure is formed between the bayonet (23) and the inclined surface (123).

9. The pneumatic mechanical emergency brake mechanism of claim 7, wherein, The cylinder group is fixedly connected with the shell, and the piston rod of the cylinder group abuts against the lower side of the first arm body; the second elastic structure is connected between the first arm body and the cylinder group.

10. A pneumatic mechanical emergency brake mechanism according to any one of claims 4 to 9, characterised in that, The lower cover (16) is fixedly connected with a mounting plate (17), the mounting plate (17) and the lower cover (16) are connected as an integral structure, and the cylinder group is fixed to the mounting plate (17).

Images