Pneumatic mechanical emergency braking mechanism

Abstract

The invention belongs to the technical field of diesel engines, and particularly relates to a pneumatic mechanical emergency braking mechanism which comprises an actuator set, the actuator set comprises a shell and a valve rod, a containing cavity is defined by the shell, the valve rod is in sliding connection with the shell and connected to the containing cavity in a penetrating mode, and an execution pushing part is formed at the first end of the valve rod; the first elastic structure is arranged in the containing cavity and used for pushing the execution pushing part to stretch out in the direction away from the shell, and the fixing block is fixed to the rod body part, located in the containing cavity, of the valve rod. The locking piece is installed on the shell, and a limiting structure capable of being combined / separated is arranged between the end, inserted into the containing cavity, of the locking piece and the fixing block; the second elastic structure is used for driving the locking piece to reset; the air cylinder set is used for pushing the limiting structure to be separated. According to the pneumatic mechanical emergency braking mechanism, the problems that an existing accelerator control mechanism cannot achieve emergency braking quickly and cannot achieve emergency braking through intelligent control are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engines, and in particular relates to a pneumatic mechanical emergency brake mechanism. Background Art

[0002] At present, diesel engines are widely used to provide power for transport vehicles, ships, construction machinery, agricultural machinery, etc. Many diesel engines adjust the output power by adjusting the throttle opening size through the throttle control mechanism. The throttle control mechanism is equipped with an automatic adjustment rocker arm and a handle operating component, which can realize automatic / manual throttle adjustment.

[0003] The existing throttle control mechanism, when the diesel engine encounters emergency situations such as runaway, cylinder pulling, shaft seizure, and abnormal operating parameters, uses a handle operating component to reduce the throttle until the diesel engine stops. The above operation requires a certain reaction time and operation time. The operation is slow and emergency braking cannot be achieved quickly, nor can emergency braking be achieved through intelligent control, which seriously affects the safety of the diesel engine itself and may also damage other equipment. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pneumatic mechanical emergency braking mechanism, aiming to solve the problem that the existing throttle control mechanism cannot quickly achieve emergency braking and cannot achieve emergency braking through intelligent control.

[0005] The present invention discloses a pneumatic mechanical emergency brake mechanism, which is applied to a throttle control mechanism of a diesel engine and is characterized by comprising:

[0006] An actuator group, the actuator group includes a shell surrounding a receiving cavity, a valve stem slidably connected to the shell and inserted into the receiving cavity, a first end of the valve stem forming an actuator push portion, and further includes a first elastic structure disposed inside the receiving cavity for pushing the actuator push portion to extend in a direction away from the shell, and a fixing block fixed to a rod body portion of the valve stem located inside the receiving cavity;

[0007] A locking member is mounted on the housing, and a limit structure capable of being engaged / separated is provided between the end of the locking member inserted into the accommodating cavity and the fixing block;

[0008] A second elastic structure is used to drive the locking member to reset;

[0009] and a cylinder group, used for pushing the limiting structure between the locking member and the fixing block to separate;

[0010] When the diesel engine is running, the actuator pushing part is in a fallen state, and the limiting structure between the locking member and the fixed block is combined together; during emergency braking, the cylinder group pushes the locking member to separate the limiting structure between the locking member and the fixed block, and the elastic force of the first elastic structure pushes the actuator pushing part to extend away from the housing, which can push the handle operating component of the throttle control mechanism to rotate to close the throttle to achieve emergency braking.

[0011] As an improvement, the valve stem passes through the accommodating cavity, the second end of the valve stem is arranged outside the shell, and a detection device is fixed to the second end of the valve stem.

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

[0013] As an improvement, the outer shell includes an upper shell that forms a cylindrical body, the upper end of the upper shell is closed, the lower end is provided with a cylinder mouth, and the upper end of the upper shell is provided with an upper mounting hole; it also includes a lower cover arranged on 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 formed between the upper shell and the lower cover; the valve stem is serially connected to the upper mounting hole and the lower mounting hole, and the first elastic structure is mounted on the valve stem between the fixing block and the lower cover.

[0014] As an improvement, the fixed block includes a large-diameter cylindrical portion arranged close to the side of the execution pushing portion, and a small-diameter cylindrical portion fixed to the large-diameter cylindrical portion on the side away from the execution pushing portion, and a step is formed at the junction of the large-diameter cylindrical portion and the small-diameter cylindrical portion; a support sleeve sleeved on the valve stem is fixed on the lower cover, and a spacing is provided between the inner side wall of the support sleeve and the valve stem, and the support sleeve is inserted into the barrel mouth; the first elastic structure includes 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 portion and the lower cover on the inner ring side of the support sleeve.

[0015] As an improvement, the inner diameter of the cylinder surrounded by the upper shell is larger than the inner diameter of the cylinder mouth, a transition connection portion is formed between the inner side wall of the cylinder surrounded by the upper shell and the cylinder mouth, a spacing is provided between the end of the support sleeve inserted into the cylinder mouth and the transition connection portion, and the first compression spring is inserted into the inside of the cylinder mouth.

[0016] As an improvement, the locking member is configured to be a rocker arm rotatably mounted on the housing, comprising a first arm body and a second arm body fixedly connected, an obtuse angle α is provided 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 side of the large diameter cylindrical portion away from the small diameter cylindrical portion is set as an inclined surface, and a bayonet is provided 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 to the housing, and the piston rod of the cylinder group is pressed against the lower side of the first arm body; 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 to a mounting plate, the mounting plate and the lower cover are connected to form an integrated structure, and the cylinder group is fixed to the mounting plate.

[0020] After adopting the above technical solution, the beneficial effects of the present invention are:

[0021] During installation, the pneumatic mechanical emergency brake mechanism is arranged on the lower side of the handle operating assembly, the actuator push part of the valve stem is arranged opposite to the handle operating assembly, the cylinder group is connected to the air supply device, and the air supply device is electrically connected to the electronic control system of the diesel engine; when the diesel engine is running, the actuator push part of the valve stem is in a fallen state, and a distance is provided between the actuator push part of the valve stem and the handle operating assembly.

[0022] When the diesel engine malfunctions, 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 member to separate the limiting structure between the locking member and the fixed block. The elastic force of the first elastic structure can quickly push the actuator pushing part of the valve stem to move away from the outer shell, thereby pushing the handle operating assembly of the throttle control mechanism to rotate to close the throttle, and emergency braking can be quickly achieved.

[0023] After eliminating the abnormal situation, the actuator push part of the valve stem is dropped back. Since the fixed block is fixed to the valve stem, it can move synchronously with the valve stem to the locking piece. The limiting structure between the locking piece and the fixed block is combined together. The actuator push part of the valve stem is in a dropped state. A spacing is provided between the actuator push part of the valve stem and the handle operating assembly. The actuator push part of the valve stem will not affect the rotation of the handle operating assembly.

[0024] The pneumatic mechanical emergency brake mechanism of the embodiment of the present invention solves the problem 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 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 is a cross-sectional structural schematic diagram of a pneumatic mechanical emergency brake mechanism according to an embodiment of the present invention;

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

[0028] Figure 4 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 part; 122, small diameter cylindrical part; 123, inclined surface; 13, first compression spring; 14, second compression spring; 15, upper shell; 151, transition connection part; 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, reset 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 solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 used to limit the present invention.

[0031] Figures 1 to 4 : is a schematic diagram of the structure of the pneumatic mechanical emergency brake mechanism according to an embodiment of the present invention, wherein: Figure 1 FIG. 1 is a schematic diagram showing a three-dimensional structure of a pneumatic mechanical emergency brake mechanism according to an embodiment of the present invention. Figure 2 FIG. 2 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 the 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 the convenience 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 position 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 suggesting 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 group, the actuator group includes a shell surrounding a receiving cavity, a valve stem 11 slidably connected to the shell and inserted into the receiving cavity of the shell, a first end of the valve stem 11 forming an actuator push portion, and further includes a first elastic structure disposed inside the receiving cavity for pushing the actuator push portion of the valve stem 11 to extend in a direction away from the shell, and a fixing block 12 fixed to the rod body portion of the valve stem 11 located inside the receiving cavity;

[0035] A locking member is installed on the housing, and a limit 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, used 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 fixing 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 is a description of 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 includes a transmission shaft assembly 60, two groups of throttle rods 70 respectively arranged at the two ends of the transmission shaft assembly 60, an automatic adjustment rocker arm 61 and a handle operating assembly 90 fixed at one end of the transmission shaft assembly 60, and a connecting rocker arm 62 fixed at the other end of the transmission shaft assembly 60, and a connecting seat assembly is respectively provided between the handle operating assembly 90, the connecting rocker arm 62 and the throttle rod 70 on the corresponding side, wherein the automatic adjustment rocker arm 61 is connected to the speed governor (not shown in the figure), and the throttle rod 70 is connected to the rack of the injection pump; the connecting seat assembly includes a connecting seat 81, a rotating shaft 82 rotatably mounted on the connecting seat 81, and an input rocker arm 83 and an output rocker arm 84 respectively fixed at the two ends of the rotating shaft 82; at the output rocker arm A first connecting rod 85 is provided between 84 and the throttle rod 70, and the two ends of the first connecting rod 85 are rotatably connected to the output rocker arm 84 and the throttle rod 70 respectively; a second connecting rod 86 is provided between the handle operating assembly 90 and the input rocker arm 83 on the corresponding side, and the two ends of the second connecting rod 86 are rotatably connected to the handle operating assembly 90 and the input rocker arm 83 on the corresponding side respectively; a third connecting rod 87 is provided between the connecting rocker arm 62 and the input rocker arm 83 on the corresponding side, and the two ends of the third connecting rod 87 are rotatably connected to the connecting rocker arm 62 and the input rocker arm 83 on the corresponding side respectively; when adjusting the throttle, whether the throttle is automatically adjusted through the automatic adjusting rocker arm 61 or manually adjusted through the handle operating assembly 90, the two groups of throttle rods 70 can be driven to move synchronously in the same direction at the same time.

[0041] During installation, the pneumatic mechanical emergency brake mechanism is arranged on the lower side of the handle operating assembly 90, and the actuator push part of the valve stem 11 is arranged opposite to the handle operating assembly 90, connecting the cylinder group with the air supply device, and the air supply device is electrically connected to the electronic control system of the diesel engine; when the diesel engine is running, the actuator push part of the valve stem 11 is in a fallen state, and a distance is provided between the actuator push part of the valve stem 11 and the handle operating assembly 90.

[0042] When the diesel engine malfunctions, 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 member 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 actuator push part of the valve stem 11 away from the outer shell, thereby pushing the handle operating assembly 90 of the throttle control mechanism to rotate to close the throttle, which can quickly achieve emergency braking.

[0043] After eliminating the abnormal situation, the execution push part of the valve stem 11 is retracted. Since the fixed block 12 is fixed to the valve stem 11, it can move synchronously with the valve stem 11 to the locking member. The limiting structure between the locking member and the fixed block 12 is combined together. The execution push part of the valve stem 11 is in a retracted state. A spacing is provided between the execution push part of the valve stem 11 and the handle operating assembly 90. The execution push part of the valve stem 11 will not affect the rotation of the handle operating assembly 90.

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

[0045] To facilitate installation and manual adjustment, the handle operating assembly 90 includes a manual rocker arm 91 fixed to the end of the transmission shaft assembly 60, and a handle 92 fixed to the manual rocker arm 91. An emergency brake screw 93 is fixedly installed on the manual rocker arm 91 at a position corresponding to the valve stem 11 to facilitate contact with the valve stem 11.

[0046] In an embodiment of the present invention, the valve stem 11 passes through the accommodating cavity of the outer shell, and the second end of the valve stem 11 is arranged outside the outer shell. A detection device 50 is fixed to the second end of the valve stem 11. The detection device 50 is electrically connected to the electronic control system of the diesel engine and is used to detect the movement state of the valve stem 11 to facilitate intelligent control.

[0047] Typically, the detection device 50 is a displacement sensor, but it can also be a distance sensor or the like.

[0048] Specifically, the fixing block 12 is disposed on the valve stem 11 near the actuator push portion, and the first elastic structure is sleeved on the valve stem 11 between the fixing block 12 and the side of the accommodating cavity away from the actuator push portion. Usually, the first elastic structure is a compression spring.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, the outer shell includes an upper shell 15 that forms a cylindrical body, the upper end of the upper shell 15 is closed, the lower end is provided with a cylinder mouth, and an upper mounting hole is provided at the upper end of the upper shell 15; it also includes a lower cover 16 that is covered at the lower end of the upper shell 15, and the lower cover 16 is provided with a lower mounting hole corresponding to the upper mounting hole, and an accommodating cavity is formed between the upper shell 15 and the lower cover 16; the valve stem 11 is connected in series to the upper mounting hole and the lower mounting hole, and the first elastic structure is sleeved on the valve stem 11 between the fixing block 12 and the lower cover 16.

[0050] Furthermore, the fixed block 12 includes a large diameter cylindrical portion 121 arranged near one side of the actuator push portion, a small diameter cylindrical portion 122 fixed to the large diameter cylindrical portion 121 away from the actuator push portion, and a step is formed at the junction of the large diameter cylindrical portion 121 and the small diameter cylindrical portion 122; a support sleeve 18 sleeved on the valve stem 11 is fixed on the lower cover 16, and a spacing is provided between the inner side wall of the support sleeve 18 and the valve stem 11, and the support sleeve 18 is inserted into the tube mouth of the upper shell 15; the first elastic structure includes a first compression spring 13 supported between the step and the support sleeve 18, and a second compression spring 14 arranged inside the first compression spring 13, and the second compression spring 14 is supported between the small diameter cylindrical portion 122 and the lower cover 16 part on the inner ring side of the support sleeve 18, which can enhance the elastic force and can more quickly drive the actuator push portion of the valve stem 11 to extend in a direction away from the shell. Correspondingly, an annular groove is provided on the lower cover 16, and the support sleeve 18 is inserted into the annular groove.

[0051] like Figure 2 and Figure 3 As shown, the inner diameter of the cylinder surrounded by the upper shell 15 is larger than the inner diameter of the cylinder mouth of the upper shell 15, and a transition connection portion 151 is formed between the inner side wall of the cylinder surrounded by the upper shell 15 and the cylinder mouth. A spacing is provided between the end of the support sleeve 18 inserted into the cylinder mouth and the transition connection portion 151. The first compression spring 13 is inserted into the cylinder mouth, which can limit the first compression spring 13 and prevent the first compression spring 13 from being deflected.

[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 part 121 away from the small diameter cylindrical part 122 is set as an inclined surface 123, and a bayonet 23 is provided on the locking piece to form a limiting structure between the bayonet 23 and the inclined surface 123.

[0053] In the embodiment of the present invention, the locking member is configured as a rocker arm 20 rotatably mounted on the housing, including a first arm body 21 and a second arm body 22 that are fixedly connected, an obtuse angle α is provided between the first arm body 21 and the second arm body 22, for example, the angle α can be set to 110 degrees, 120 degrees, etc., the second arm body 22 is inserted into the accommodating cavity, the bayonet 23 is provided at the end 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. Usually, two mounting rings are provided at intervals on the upper shell 15, the connection between the first arm body 21 and the second arm body 22 is rotatably mounted between the two mounting rings, and a notch is provided at the upper shell 15 between the two mounting rings to facilitate the insertion of the second arm body 22 into the accommodating cavity.

[0054] like Figure 1As shown, the cylinder group is fixedly connected to the housing, and the piston rod of the cylinder group is 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 usually, the second elastic structure is a return spring 40.

[0055] After the cylinder 30 is de-energized, the thrust of the piston rod of the cylinder 30 disappears, and the return spring 40 pulls the rocker arm 20 to rotate. Under the squeezing of the first arm body 21 and the action of its own gravity, the piston and 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 braking is completed, the valve stem 12 needs to be reset, that is, the valve stem 12 is pressed downward by external force until the fixed block 12 moves to one end of the second arm body 22 of the rocker arm 20 inserted into the accommodating cavity, so that the limiting structure is combined together, and after the piston and piston rod of the cylinder 30 fall back, under the limiting action of the piston rod of the cylinder 30, the rocker arm 20 no longer rotates, and the position of the fixed block 12 can be limited, thereby keeping the execution push part of the valve stem 11 in the fallen state.

[0056] For ease of installation, the lower cover 16 is fixedly connected with a mounting plate 17 , and the cylinder group is fixed to the mounting plate 17 . Usually, the mounting plate 17 and the lower cover 16 are connected to form an integrated structure.

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

[0058] like 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; usually, fixing screws are respectively provided on the first arm body 21 and the mounting sleeve 31, and the second elastic structure is arranged between the fixing screws on the first arm body 21 and the fixing screws on the mounting sleeve 31.

[0059] The above are examples of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. A pneumatic mechanical emergency brake mechanism, applied to a throttle control mechanism of a diesel engine, characterized in that: include: An actuator group, the actuator group comprising a shell surrounding a receiving cavity, a valve stem (11) slidably connected to the shell and inserted into the receiving cavity, the first end of the valve stem (11) forming an actuator push portion, and further comprising a first elastic structure arranged inside the receiving cavity for pushing the actuator push portion to extend in a direction away from the shell, and a fixing block (12) fixed to a rod body portion of the valve stem (11) located inside the receiving cavity; A locking member is mounted on the housing, and a limit structure capable of being engaged / disengaged is provided between the end of the locking member inserted into the accommodating cavity and the fixing block (12); A second elastic structure is used to drive the locking member to reset; and a cylinder group, used for pushing the limiting structure between the locking member and the fixing block (12) to separate; When the diesel engine is running, the execution pushing part is in a falling state, and the limiting structure between the locking part and the fixed block (12) is combined together; when emergency braking is performed, the cylinder group pushes the locking part to cause the limiting structure between the locking part and the fixed block (12) to separate, and the elastic force of the first elastic structure pushes the execution pushing part to extend in a direction away from the housing, which can push the handle operating component (90) of the throttle control mechanism to rotate to close the throttle to achieve emergency braking.

2. The pneumatic mechanical emergency brake mechanism according to claim 1, characterized in that: The valve stem (11) passes through the accommodating cavity, the second end of the valve stem (11) is arranged outside the shell, and a detection device (50) is fixed to the second end of the valve stem (11).

3. The pneumatic mechanical emergency brake mechanism according to claim 2, characterized in that: The fixing block (12) is arranged on a side of the valve stem (11) close to the execution pushing portion, and the first elastic structure is sleeved on the valve stem (11) between the fixing block (12) and a side of the accommodating cavity away from the execution pushing portion.

4. The pneumatic mechanical emergency brake mechanism according to claim 3, characterized in that: The outer shell comprises an upper shell (15) which forms a cylindrical body, the upper end of the upper shell (15) is closed, the lower end is provided with a cylinder mouth, and the upper end of the upper shell (15) is provided with an upper mounting hole; it also comprises a lower cover (16) which is covered on 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 a accommodating cavity is formed between the upper shell (15) and the lower cover (16); the valve stem (11) is connected in series to the upper mounting hole and the lower mounting hole, and the first elastic structure is sleeved on the valve stem (11) between the fixing block (12) and the lower cover (16).

5. The pneumatic mechanical emergency brake mechanism according to claim 4, characterized in that: The fixed block (12) comprises a large diameter cylindrical portion (121) arranged near the side of the execution pushing portion, and a small diameter cylindrical portion (122) fixed to the large diameter cylindrical portion (121) away from the side of the execution pushing portion, and a step is formed at the adjacent position of the large diameter cylindrical portion (121) and the small diameter cylindrical portion (122); a support sleeve (18) sleeved on the valve stem (11) is fixed on the lower cover (16), and a spacing is provided between the inner side wall of the support sleeve (18) and the valve stem (11), and the support sleeve (18) is inserted into the barrel mouth; 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 inside the first compression spring (13), and the second compression spring (14) is supported between the small diameter cylindrical portion (122) and the lower cover (16) on the inner ring side of the support sleeve (18).

6. The pneumatic mechanical emergency brake mechanism according to claim 5, characterized in that: The inner diameter of the cylinder formed by the upper shell (15) is larger than the inner diameter of the cylinder mouth, and a transition connection portion (151) is formed between the inner side wall of the cylinder formed by the upper shell (15) and the cylinder mouth. A spacing is provided between the end of the support sleeve (18) inserted into the cylinder mouth and the transition connection portion (151), and the first compression spring (13) is inserted into the inside of the cylinder mouth.

7. The pneumatic mechanical emergency brake mechanism according to claim 5, characterized in that: The locking member is configured as a rocker arm (20) rotatably mounted on the housing, comprising a first arm body (21) and a second arm body (22) that are fixedly connected, an obtuse angle α is provided 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 provided between the second arm body (22) and the fixing block (12).

8. The pneumatic mechanical emergency brake mechanism according to claim 7, characterized in that: A side of the large diameter cylindrical portion (121) away from the small diameter cylindrical portion (122) is provided as an inclined surface (123), and a bayonet (23) is provided at the end of the second arm (22) inserted into the interior of 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 according to claim 7, characterized in that: The cylinder group is fixedly connected to the housing, and the piston rod of the cylinder group is pressed 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. The pneumatic mechanical emergency brake mechanism according to any one of claims 4 to 9, characterized in that: The lower cover (16) is fixedly connected to a mounting plate (17); the mounting plate (17) and the lower cover (16) are connected to form an integrated structure; and the cylinder group is fixed to the mounting plate (17).

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