Tread type mechanical braking device

Abstract

The utility model relates to a tread type mechanical braking device, which comprises a brake shoe component, a brake pad component and a pedal component, the shell assembly is connected with the brake shoe assembly; the driving assembly is arranged in the shell assembly; the electromechanical actuator is arranged in the shell assembly and comprises a lead screw transmission structure, a lead screw nut structure arranged on the lead screw transmission structure and a push rod arranged in the lead screw transmission structure, a lead screw connecting hole is formed in the lead screw transmission structure, and the lead screw nut structure is connected with the push rod through the lead screw connecting hole; wherein the lead screw transmission structure is connected with the driving assembly, the push rod is connected with the brake shoe assembly, and the lead screw nut structure is used for converting rotating motion of the lead screw transmission structure into linear motion of the push rod so as to push the brake shoe assembly to conduct braking. The problems that an existing tread type brake unit is low in brake efficiency, low in response speed and large in occupied space, and pipelines are prone to leakage can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rail vehicles, in particular to a tread type mechanical brake device. Background Art

[0002] Rail grinding is the grinding of the rail top and rail profile by the combined action of grinding machinery and grinding tools to reduce rail head wear and eliminate defects. Rail grinding vehicles are the main rail maintenance equipment in recent years. Compared with grinding trains, miniaturized rail grinding vehicles can effectively maintain short-distance lines near turnouts and stations, as well as lines at factories, mines, and stations.

[0003] The existing rail grinding vehicles mostly use tread-type air and hydraulic brake units, and the braking and release are achieved by spring brakes. They have the problems of low braking efficiency, slow response speed, large space occupation and easy leakage of pipelines. Utility Model Content

[0004] The embodiment of the utility model provides a tread type mechanical brake device, which can solve the problems of low braking efficiency, slow response speed, large occupied space and easy leakage of pipelines in the existing tread type brake unit.

[0005] In a first aspect, an embodiment of the utility model provides a tread type mechanical brake device, comprising:

[0006] Brake shoe assembly, used for braking;

[0007] A housing assembly connected to the brake shoe assembly;

[0008] A drive assembly, disposed in the housing assembly;

[0009] An electromechanical actuator is disposed in the housing assembly, comprising a screw transmission structure, a screw nut structure disposed on the screw transmission structure, and a push rod disposed in the screw transmission structure, wherein the screw transmission structure is provided with a screw connecting hole, and the screw nut structure is connected to the push rod through the screw connecting hole;

[0010] Among them, the screw transmission structure is connected to the driving assembly, the push rod is connected to the brake shoe assembly, and the screw nut structure is used to convert the rotational motion of the screw transmission structure into the linear motion of the push rod to push the brake shoe assembly for braking.

[0011] In some embodiments, the housing assembly comprises:

[0012] outer shell;

[0013] A shell connecting arm has one end connected to the shell body and the other end connected to the brake shoe assembly.

[0014] In some embodiments, the brake shoe assembly comprises:

[0015] brake shoe;

[0016] A brake shoe support, comprising an outer connecting portion and an inner connecting portion arranged inside the outer connecting portion, wherein the outer connecting portion is connected to the brake shoe, and the inner connecting portion is connected to the push rod;

[0017] An elastic retaining ring is arranged on the outside of the brake shoe support, one end of which is rotatably connected to a side of the outer connecting portion away from the brake shoe, and the other end of which is rotatably connected to the housing connecting arm.

[0018] In some embodiments, the drive assembly comprises:

[0019] Motor;

[0020] An electromagnetic clutch connected to the motor;

[0021] A reducer connected to the electromagnetic clutch;

[0022] The driving transmission structure is arranged at a side away from the brake shoe assembly, one end of which is connected to the reducer, and the other end of which is connected to the lead screw transmission structure.

[0023] In some embodiments, the drive transmission structure includes:

[0024] A driving wheel connected to the reducer;

[0025] A driven wheel connected to the screw transmission structure;

[0026] A transmission belt connects the driving wheel and the driven wheel.

[0027] In some embodiments, the electromechanical actuator further comprises a cylinder body located below the motor, wherein the cylinder body is disposed outside the lead screw transmission structure and is rotationally connected to the lead screw transmission structure.

[0028] In some embodiments, the screw transmission structure includes:

[0029] A transmission shaft connected to the drive transmission structure and extending outside the drive transmission structure;

[0030] A transmission screw is connected to one end of the transmission shaft away from the driving transmission structure, and is provided with the screw connection hole and the push rod.

[0031] In some embodiments, the screw transmission structure further includes a T-shaped connector, one end of which is connected to the push rod, and the other end of which is connected to the brake shoe assembly.

[0032] In some embodiments, the screw nut structure includes:

[0033] A lead screw nut, arranged on the transmission lead screw;

[0034] A nut top sleeve connected to the lead screw nut;

[0035] A top sleeve connecting piece has one end connected to the nut top sleeve and the other end passing through the lead screw connecting hole and connected to the push rod.

[0036] In some embodiments, the screw nut structure also includes a nut support sleeve, one end of the nut support sleeve is connected to the screw nut, and the other end of the nut support sleeve is connected to the nut top sleeve, wherein the nut support sleeve is provided with a nut guide band and a nut sealing ring.

[0037] Compared with the prior art, the advantage of the embodiments of the utility model lies in that, by arranging the screw nut structure on the screw transmission structure, connecting the screw nut structure with the push rod through the screw connecting hole, connecting the screw transmission structure with the drive assembly, and connecting the push rod with the brake shoe assembly, the screw nut structure can convert the rotational motion of the screw transmission structure into linear motion of the push rod to push the brake shoe assembly for braking, thereby realizing mechanical braking, and being able to solve the problems of low braking efficiency, slow response speed, large occupied space and easy leakage of pipelines in existing air and hydraulic tread type brake units, thereby improving the braking efficiency, response speed and occupying less space. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0039] Figure 1 It is a three-dimensional diagram of a tread-type mechanical brake device provided by an embodiment of the utility model;

[0040] Figure 2 It is a top view of a tread type mechanical brake device provided by an embodiment of the utility model;

[0041] Figure 3 This is a stereogram of the assembly of a drive assembly and an electromechanical actuator provided by an embodiment of the utility model;

[0042] Figure 4 This is a front view of the assembly of the drive assembly and the electromechanical actuator provided by one embodiment of the utility model;

[0043] Figure 5 It is a cross-sectional view of the assembly of a drive transmission structure and an electromechanical actuator provided by an embodiment of the utility model.

[0044] Reference numerals:

[0045] 10. brake shoe assembly; 110. brake shoe; 120. brake shoe support; 1201. external connection part; 1202. internal connection part; 130. elastic retaining ring;

[0046] 20. Shell assembly; 210. Shell body; 220. Shell connecting arm;

[0047] 30. driving assembly; 310. motor; 320. electromagnetic clutch; 330. reducer;

[0048] 340, driving transmission structure; 3401, belt box; 3402, driving wheel; 3403, transmission belt;

[0049] 40. Electromechanical actuators;

[0050] 410, screw transmission structure; 4101, transmission shaft; 4102, transmission screw; 4102A, screw connection hole; 4103, push rod; 4104, T-type connector; 4105, transmission bearing;

[0051] 420, lead screw nut structure; 4201, lead screw nut; 4202, nut top sleeve; 4203, nut support sleeve;

[0052] 430, cylinder body; 4301, front end cover; 4302, end cover guide belt; 4303, end cover sealing ring; 4304, mounting seat; 4305, cylinder shell. DETAILED DESCRIPTION

[0053] The utility model will be further described below in conjunction with the accompanying drawings.

[0054] Railways are important infrastructure in my country. They play a key role in my country's comprehensive transportation system and provide important support for the country's economic development. In recent years, with the continuous development and rapid progress of my country's railway technology, rails, as the core components of the railway system, provide load-bearing and guiding functions for trains, while also bearing increasing operating loads. Rolling contact fatigue and wear are the main reasons affecting the service life of rails. Common contact fatigue includes rail head cracks, collapse, peeling, fat edges, and rail abrasions. Rail wear includes vertical wear, side wear, and wave wear (referred to as wave wear). If these problems are not maintained and repaired in a timely manner, the service life of the rails will be greatly shortened, and even serious safety problems will be caused.

[0055] A large number of practices and studies have shown that rail grinding is an important technical means to effectively repair rail defects. Rail grinding is the grinding of the rail top and rail profile under the joint action of grinding machinery and grinding tools to reduce rail head wear and eliminate defects. Rail grinding vehicles are the main rail maintenance equipment in recent years. Compared with grinding trains, miniaturized rail grinding vehicles can effectively maintain short-distance lines near turnouts and stations, as well as lines at factories, mines, and stations.

[0056] The existing rail grinding vehicles mostly use tread-type air and hydraulic brake units, and the braking and release are achieved by spring brakes. They have problems such as low braking efficiency, slow response speed, large space occupation and easy leakage of pipelines. In addition, they have complex structures and low control accuracy, and do not meet the requirements of lightweight and intelligent small rail grinding vehicles.

[0057] Electromechanical braking technology utilizes a motor to drive a mechanism to achieve braking action, and directly converts electrical signals into braking force output through a motor, a reduction mechanism, etc. Compared with air and hydraulic brakes, it has the advantages of simple structure, small size, fast response speed, and high control accuracy.

[0058] First, as Figure 1 , Figure 2 , Figure 3 As shown, the embodiment of the present application provides a tread type mechanical brake device, characterized in that it includes:

[0059] A brake shoe assembly 10, used for braking;

[0060] A housing assembly 20 connected to the brake shoe assembly 10;

[0061] The driving assembly 30 is disposed in the housing assembly 20;

[0062] The electromechanical actuator 40 is disposed in the housing assembly 20, and includes a screw transmission structure 410, a screw nut structure 420 disposed on the screw transmission structure 410, and a push rod 4103 disposed in the screw transmission structure 410. The screw transmission structure 410 is provided with a screw connection hole 4102A, and the screw nut structure 420 is connected to the push rod 4103 through the screw connection hole 4102A.

[0063] Among them, the screw transmission structure 410 is connected to the driving assembly 30, the push rod 4103 is connected to the brake shoe assembly 10, and the screw nut structure 420 is used to convert the rotational motion of the screw transmission structure 410 into the linear motion of the push rod 4103 to push the brake shoe assembly 10 for braking.

[0064] It should be noted that when braking, the drive assembly 30 outputs torque to the screw transmission structure 410, and the screw transmission structure 410 rotates. The screw nut structure 420 provided on the screw transmission structure 410 converts the rotational motion of the screw transmission structure 410 into a linear motion of the screw nut structure 420, thereby driving the push rod 4103 to extend or retract, and then push out or retract the brake shoe assembly 10 to achieve braking and relief (i.e. no braking), wherein the screw connecting hole 4102A can be a spiral hole to ensure that when the screw transmission structure 410 rotates, the connection between the screw nut structure 420 and the push rod 4103 will not block the rotation of the screw transmission structure 410.

[0065] In some embodiments, the housing assembly 20 includes:

[0066] An outer shell 210;

[0067] The housing connecting arm 220 has one end connected to the housing body 210 and the other end connected to the brake shoe assembly 10 .

[0068] It should be noted that if Figure 2 As shown, the housing assembly 20 is usually provided with two housing connecting arms 220, which are located on the upper side of the housing body 210 and are respectively located on the outside of the brake shoe assembly 10 to facilitate connection with the brake shoe assembly 10. A driving assembly 30 and an electromechanical actuator 40 are provided in the housing.

[0069] In some embodiments, the brake shoe assembly 10 includes:

[0070] Brake shoe 110;

[0071] The brake shoe support 120 includes an outer connecting portion 1201 and an inner connecting portion 1202 disposed inside the outer connecting portion 1201, wherein the outer connecting portion 1201 is connected to the brake shoe 110, and the inner connecting portion 1202 is connected to the push rod 4103;

[0072] The elastic retaining ring 130 is disposed outside the brake shoe support 120 , one end of which is rotatably connected to a side of the outer connecting portion 1201 away from the brake shoe 110 , and the other end of which is rotatably connected to the housing connecting arm 220 .

[0073] It should be noted that if Figure 1As shown, the left end of the brake shoe 110 is the braking surface of the brake shoe 110, and the right end of the brake shoe 110 is provided with a shoe nose, through which the brake shoe 110 is connected to the brake shoe support 120, and the brake shoe support 120 is usually provided with two outer connecting parts 1201 and an inner connecting part 1202, and the inner connecting part 1202 is located between the two outer connecting parts 1201, and the brake shoe assembly 10 is usually provided with two elastic retaining rings 130, and the two elastic retaining rings 130 are respectively located on the outside of the outer connecting part 1201, and the elastic retaining ring 130 is arranged along the height direction of the brake shoe support 120, and the lower end of the elastic retaining ring 130 is rotatably connected to the outer connecting part 1201 through a groove shaft and a rotating shaft arranged in the groove shaft, and the upper end of the elastic retaining ring 130 is rotatably connected to the outer shell connecting arm 220 through the rotating shaft, thereby realizing the connection between the elastic retaining ring 130 and the outer shell 210 and the brake shoe support 120 respectively, wherein the inner connecting part 1202 can be rotatably connected to the outer connecting part 1201.

[0074] In some embodiments, the drive assembly 30 includes:

[0075] Motor 310;

[0076] An electromagnetic clutch 320 connected to the motor 310;

[0077] A speed reducer 330 connected to the electromagnetic clutch 320;

[0078] The driving transmission structure 340 is disposed at a side away from the brake shoe assembly 10 , one end of which is connected to the reducer 330 , and the other end of which is connected to the lead screw transmission structure 410 .

[0079] It should be noted that the use of electromagnetic clutch 320 can achieve long-distance control, small control energy, easy to realize automation, fast action, simple structure, and power-off braking characteristics. The reducer is used to adjust the output speed and torque of the motor 310, wherein the motor 310 can be a DC brushless motor 310, and the reducer 330 can be a planetary gear reducer 330.

[0080] In some embodiments, the drive transmission structure 340 includes:

[0081] The driving wheel 3402 is connected to the reducer 330;

[0082] A driven wheel connected to the screw transmission structure 410;

[0083] The transmission belt 3403 connects the driving wheel 3402 and the driven wheel.

[0084] It should be noted that the rotation speed and torque of the motor 310 can be transmitted to the screw transmission structure 410 through the drive transmission structure 340. The drive transmission structure 340 can also include a belt box 3401 arranged outside the driving wheel 3402, the driven wheel, and the transmission belt 3403 to protect the drive transmission structure 340. In addition to the transmission belt 3403, transmission structures such as transmission chains can also be used for transmission.

[0085] In some embodiments, the electromechanical actuator 40 further includes a cylinder body 430 located below the motor 310 . The cylinder body 430 is disposed outside the lead screw transmission structure 410 and is rotatably connected to the lead screw transmission structure 410 .

[0086] It should be noted that if Figure 4 , Figure 5 As shown, the motor 310, the electromagnetic clutch 320 and the reducer 330 are located at the top, the cylinder body 430 is located at the bottom of the motor 310, the electromagnetic clutch 320 and the reducer 330, and the drive transmission structure 340 is located on the side of the reducer 330 and the cylinder body 430, which can make full use of the space and reduce the volume of the drive component 30 and the electromechanical actuator 40.

[0087] It should be noted that the cylinder body 430 includes a cylinder shell 4305, a front end cover 4301 arranged on the right end face of the cylinder shell 4305, an end cover guide belt 4302 and an end cover sealing ring 4303 arranged between the front end cover 4301 and the screw transmission structure 410, and a mounting seat 4304 arranged below the cylinder shell 4305. The end cover guide belt 4302 and the end cover sealing ring 4303 can ensure the sealing between the front end cover 4301 and the screw transmission structure 410 and prevent leakage.

[0088] In some embodiments, the screw transmission structure 410 includes:

[0089] The transmission shaft 4101 is connected to the driving transmission structure 340 and extends outside the driving transmission structure 340;

[0090] The transmission screw 4102 is connected to one end of the transmission shaft 4101 away from the driving transmission structure 340, and is provided with a screw connection hole 4102A, and a push rod 4103 is provided therein.

[0091] It should be noted that the screw transmission structure 410 also includes a transmission bearing 4105, which is arranged between the transmission shaft 4101 and the cylinder housing 4305 to fix the transmission shaft 4101. The transmission shaft 4101 is connected to the driven wheel, and the right end face of the transmission shaft 4101 is connected to the left end of the transmission screw 4102 through a fastening screw.

[0092] It should be noted that a guide belt and a sealing ring are provided between the transmission screw 4102 and the cylinder housing 4305. The interior of the transmission screw 4102 is a hollow structure, in which a push rod 4103 is provided, and a screw nut structure 420 is provided on the outside. The transmission shaft 4101 extends from one end close to the drive transmission structure 340 to the outside of the drive transmission structure 340 (i.e., the outside of the belt box 3401), and the extension distance can be 10 cm. When a tread-type mechanical brake device fails, a handle can be added to the extended part of the transmission shaft 4101 to realize the manual relief braking function, and the extension distance can be set according to actual needs.

[0093] It should be noted that the screw connecting hole 4102A can be spiral and does not need to cover the entire length of the transmission screw 4102. It only needs to meet the braking distance requirements. That is, if the braking distance required for the brake shoe 110 to move is 20cm, then the straight length of the screw connecting hole 4102A can be 20cm-25cm.

[0094] In some embodiments, the screw transmission structure 410 further includes a T-shaped connector 4104 , one end of the T-shaped connector 4104 is connected to the push rod 4103 , and the other end of the T-shaped connector 4104 is connected to the brake shoe assembly 10 .

[0095] It should be noted that the T-shaped connecting piece 4104 can be a T-shaped bolt, and the right end face of the push rod 4103 is provided with a threaded hole for connecting the T-shaped bolt, and the inner connecting part 1202 is provided with a T-shaped slot for installing the bolt head of the T-shaped bolt. In this way, the connection between the push rod 4103 and the brake shoe support 120 can be achieved, and it is easy to install and disassemble.

[0096] The screw nut structure 420 includes:

[0097] The lead screw nut 4201 is provided on the transmission lead screw 4102;

[0098] The nut top sleeve 4202 is connected to the lead screw nut 4201;

[0099] The top sleeve connecting piece has one end connected to the nut top sleeve 4202 and the other end passing through the lead screw connecting hole 4102A and connected to the push rod 4103.

[0100] In some embodiments, the screw nut structure 420 also includes a nut support sleeve 4203, one end of the nut support sleeve 4203 is connected to the screw nut 4201, and the other end of the nut support sleeve 4203 is connected to the nut top sleeve 4202, wherein the nut support sleeve 4203 is provided with a nut guide belt and a nut sealing ring.

[0101] It should be noted that the top sleeve connector can be a fastening screw, and the nut guide belt and nut sealing ring provided on the nut support sleeve 4203 can ensure the movement and sealing of the screw nut structure 420.

[0102] It should be noted that, through the above structure and connection method, when braking, the electromagnetic clutch 320 is in an energized and released state, the motor 310 rotates in the forward direction, and the high-speed and low-torque rotation outputs the low-speed and high-torque rotation through the reducer 330, and drives the driving wheel 3402 to rotate, and is transmitted to the driven wheel through the transmission belt 3403. The transmission shaft 4101 rotates under the drive of the driven wheel, and the transmission screw 4102 rotates together with the driven wheel. Due to the limiting effect of the guide belt and the internal structure of the cylinder shell 4305, the rotational freedom of the screw nut 4201 is limited. The rotation of the transmission screw 4102 is converted into a linear motion of the screw nut 4201 through the screw nut structure 420, and then converted into a linear motion of the push rod 4103, and the brake shoe assembly 10 is pushed to perform a linear motion through the T-bolt, and the brake shoe 110 is further applied to the wheel tread to complete the application of braking force. In addition, the real-time current and real-time speed of the motor 310 can be measured by current sensors, encoders, etc., so as to monitor the braking force in real time, and the motor 310 can be controlled according to the monitored values ​​(such as forward and reverse rotation, number of revolutions, etc.) to achieve dynamic closed-loop control of the braking force.

[0103] When emergency braking or parking brake force maintenance is required, the electromagnetic clutch 320 can be powered on and released first, and the motor 310 can be controlled to rotate forward, and the braking force applied reaches the target value, and then the electromagnetic clutch 320 can be controlled to lose power. At this time, the output shaft of the motor 310 is locked under the force of the electromagnetic clutch 320 to prevent the transmission screw 4102 from retreating, thereby maintaining the braking force. In addition, the encoder in the motor 310 can measure the speed and position of the motor 310 rotor in real time, and can realize the automatic adjustment function of the brake clearance, and can ensure that the clearance between the brake shoe 110 and the wheel tread remains constant during the release without the help of other mechanical components, avoiding the phenomenon of increased braking response time due to wear of the brake shoe 110.

[0104] In addition, when the device suddenly fails when the brake is applied or the braking force needs to be forcibly relieved in the power-off state, the electromagnetic clutch 320 can be powered on and relieved through the backup power supply, and the drive shaft 4101 and the drive screw 4102 can be manually reversed and retracted through the handle, thereby achieving manual relief.

[0105] In summary, compared with the prior art, the advantage of the embodiments of the utility model lies in that, by arranging the screw nut structure 420 on the screw transmission structure 410, connecting the screw nut structure 420 with the push rod 4103 through the screw connecting hole 4102A, connecting the screw transmission structure 410 with the drive assembly 30, and connecting the push rod 4103 with the brake shoe assembly 10, the screw nut structure 420 can convert the rotational motion of the screw transmission structure 410 into the linear motion of the push rod 4103, so as to push the brake shoe assembly 10 for braking, thereby realizing mechanical braking, and being able to solve the problems of low braking efficiency, slow response speed, large occupied space and easy leakage of pipelines in the existing air and hydraulic tread type brake units, thereby improving the braking efficiency, response speed and occupying less space.

[0106] It should be noted that the tread-type mechanical brake device of the utility model is essentially a wire control technology, which can drive the mechanical transmission structure through the motor 310 to output linear motion to realize the clamping action of the brake friction pair, thereby outputting control power, converting the vehicle kinetic energy into heat energy to generate braking force, and has the following advantages over traditional air and hydraulic brakes: 1) Since the heavy and complex pipelines and control units are omitted, the overall complexity of the system can be reduced, and the output capacity of the unit mass braking force can be greatly improved; 2) The mechanical brake unit only includes the motor 310, the deceleration and torque increase device, the motion conversion device and the basic brake unit, and the degree of integration is high, the system components are greatly reduced, the corresponding failure points can be reduced, the risk of medium leakage is fundamentally avoided, and it is more environmentally friendly; the modular integration of the product reduces the difficulty of debugging and maintenance; 3) It can realize direct closed-loop control of the braking force, which is higher in accuracy and faster in response than the closed-loop control of medium pressure; and it has rich self-test and status monitoring functions, which can realize the automatic identification and positioning function of component failure; 4) It avoids the energy loss caused by the traditional medium pressure brake system; due to the direct drive of the motor 310, the intermediate links and additional efficiency losses can be reduced.

Claims

1. A tread type mechanical brake device, characterized in that: include: Brake shoe assembly, used for braking; A housing assembly connected to the brake shoe assembly; A drive assembly, disposed in the housing assembly; An electromechanical actuator is disposed in the housing assembly, comprising a screw transmission structure, a screw nut structure disposed on the screw transmission structure, and a push rod disposed in the screw transmission structure, wherein the screw transmission structure is provided with a screw connecting hole, and the screw nut structure is connected to the push rod through the screw connecting hole; Among them, the screw transmission structure is connected to the driving assembly, the push rod is connected to the brake shoe assembly, and the screw nut structure is used to convert the rotational motion of the screw transmission structure into the linear motion of the push rod to push the brake shoe assembly for braking.

2. The tread type mechanical brake device according to claim 1, characterized in that: The housing assembly comprises: outer shell; A shell connecting arm has one end connected to the shell body and the other end connected to the brake shoe assembly.

3. The tread type mechanical brake device according to claim 2, characterized in that: The brake shoe assembly comprises: brake shoe; A brake shoe support, comprising an outer connecting portion and an inner connecting portion arranged inside the outer connecting portion, wherein the outer connecting portion is connected to the brake shoe, and the inner connecting portion is connected to the push rod; An elastic retaining ring is arranged on the outside of the brake shoe support, one end of which is rotatably connected to a side of the outer connecting portion away from the brake shoe, and the other end of which is rotatably connected to the housing connecting arm.

4. The tread type mechanical brake device according to claim 1, characterized in that: The drive assembly comprises: Motor; An electromagnetic clutch connected to the motor; A reducer connected to the electromagnetic clutch; The driving transmission structure is arranged at a side away from the brake shoe assembly, one end of which is connected to the reducer, and the other end of which is connected to the lead screw transmission structure.

5. The tread type mechanical brake device according to claim 4, characterized in that: The drive transmission structure comprises: A driving wheel connected to the reducer; A driven wheel connected to the screw transmission structure; A transmission belt connects the driving wheel and the driven wheel.

6. The tread type mechanical brake device according to claim 4, characterized in that: The electromechanical actuator further comprises a cylinder body located below the motor, wherein the cylinder body is arranged outside the lead screw transmission structure and is rotationally connected to the lead screw transmission structure.

7. The tread type mechanical brake device according to claim 4, characterized in that: The screw transmission structure comprises: A transmission shaft connected to the drive transmission structure and extending outside the drive transmission structure; A transmission screw is connected to one end of the transmission shaft away from the driving transmission structure, and is provided with the screw connection hole and the push rod.

8. The tread type mechanical brake device according to claim 7, characterized in that: The screw transmission structure also includes a T-shaped connecting piece, one end of which is connected to the push rod, and the other end of which is connected to the brake shoe assembly.

9. The tread type mechanical brake device according to claim 7, characterized in that: The screw nut structure comprises: A lead screw nut, arranged on the transmission lead screw; A nut top sleeve connected to the lead screw nut; A top sleeve connecting piece has one end connected to the nut top sleeve and the other end passing through the lead screw connecting hole and connected to the push rod.

10. The tread type mechanical brake device according to claim 9, characterized in that: The screw nut structure also includes a nut support sleeve, one end of which is connected to the screw nut, and the other end of which is connected to the nut top sleeve, wherein a nut guide belt and a nut sealing ring are provided on the nut support sleeve.

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