Double-arm crank connecting structure, steering mechanism and connecting method of mine car

Abstract

This invention discloses a double-arm crank connection structure for a mining truck, comprising: a double-arm crank, wherein the double-arm crank has a longitudinally extending first through hole and a transversely extending second through hole on its inner side, and a left hinge hole and a right hinge hole respectively at its outer ends; a pin is installed in the first through hole, and a first plane penetrating tangentially is provided on the outer circumferential surface of the pin, with inclined surfaces on both sides of the first plane; a limiting pin is installed in the second through hole, and a locking inclined surface penetrating tangentially and a second plane are provided on its outer circumferential surface, the locking inclined surface being connected to the second plane; an external thread is provided on the outer circumferential surface of the limiting pin at the end of the second plane, and an anti-loosening nut is installed on the external thread. This invention also discloses a steering mechanism and a connection method for the double-arm crank connection structure. This invention can simultaneously fix the double-arm crank relative to the pin in the axial, radial, and circumferential directions, preventing relative rotation or axial movement of the double-arm crank relative to the pin when under force.

Description

Technical Field

[0001] This invention belongs to the field of mining vehicles, specifically, it relates to a double-arm crank connection structure, steering mechanism and connection method for a mining vehicle. Background Technology

[0002] Mining trucks are used for material transportation in open-pit mines, where the road conditions are harsh. For mining trucks equipped with independent suspension and disconnected steering mechanisms, the double-arm crank in the steering mechanism is a key component that connects the left and right steering wheels to achieve steering. One end of the crank is connected to the frame in a rotatable manner via a pin, and the other end is hinged to the tie rod that controls the steering of the left and right steering wheels. The force generated by the independent movement of the left and right steering wheels is applied to the double-arm crank through the tie rod.

[0003] Because the double-arm crank is subjected to harsh working conditions, its connection with the frame must be reliable. That is, the connection between the double-arm crank and the pin should be firm to avoid abnormal wear caused by relative movement between the double-arm crank and the pin under complex stress conditions, which could lead to connection failure. Summary of the Invention

[0004] The purpose of this invention is to provide a double-arm crank connection structure, steering mechanism and connection method for a mining vehicle, which can simultaneously fix the double-arm crank relative to the pin in the axial, radial and circumferential directions, avoiding relative rotation or axial movement and relative wear between the double-arm crank and the pin when under force.

[0005] To achieve the above objectives, the technical solution used in this invention is: The double-arm crank connection structure of the mining car includes: double-arm cranks, pins, limiting pins, and anti-loosening nuts. The double-arm cranks have a longitudinally extending first through hole and a transversely extending second through hole on their inner side. The first through hole and the second through hole intersect each other and are perpendicular to each other. The double-arm cranks have a left hinge hole and a right hinge hole at their outer ends, respectively. The pin is installed in the first through hole. The outer circumferential surface of the pin has a first plane that penetrates tangentially, and the two sides of the first plane have inclined surfaces. The limiting pin is installed in the second through hole. The outer circumferential surface of the pin has a locking inclined surface that penetrates tangentially and a second plane. The locking inclined surface is connected to the second plane. The outer circumferential surface of the limiting pin at the end of the second plane has an external thread, and the anti-loosening nut is installed on the external thread.

[0006] Furthermore, the double-arm crank is plate-shaped, and the pin and limiting pin are cylindrical in shape.

[0007] Furthermore, the first through hole is located on the first central axis, the second through hole is located on the second central axis, the first central axis and the second central axis are perpendicular to each other, and the first central axis and the second central axis do not intersect.

[0008] Furthermore, the first plane comes into contact with the locking ramp and the second plane.

[0009] Furthermore, the width of the first plane is equal to the maximum width of the locking ramp, the angle between the ramp and the vertical plane on both sides of the first plane is the first included angle T1, and the angle between the tangent line passing through the intersection of the locking ramp and the second plane and the intersection of the outer peripheral surface and the symmetrical surface of the locking ramp is the second included angle T2, and the first included angle T1 ≥ the second included angle T2.

[0010] The steering mechanism includes: a base, a left steering arm, a right steering arm, a tie rod, a left steering cylinder, a right steering cylinder, and a double-arm crank connection structure. The base has an upper through hole and a lower through hole, which are coaxially located on a first central axis. The base has a left hinge seat and a right hinge seat on its upper sides, respectively. A pin is installed in the first through hole, the upper through hole, and the lower through hole. The first through hole is located between the upper through hole and the lower through hole. The left steering cylinder is hinged between the left steering arm and the left hinge seat. The right steering cylinder is hinged between the right steering arm and the right hinge seat. Tie rods are respectively hinged between the left hinge hole, the left steering arm, and the right hinge hole and the right steering arm.

[0011] Preferably, an upper sliding bearing and a lower sliding bearing are respectively provided at the hinge positions between the pin and the upper through hole and the lower through hole, and a thrust bearing is respectively provided between the double-arm crank and the lower end face of the upper through hole and the upper end face of the lower through hole.

[0012] Preferably, the rear end of the cylinder body and the front end of the piston rod of the left steering cylinder are hinged to the left steering arm and the left hinge seat, respectively; the rear end of the cylinder body and the front end of the piston rod of the right steering cylinder are hinged to the right steering arm and the right hinge seat, respectively; the rotation direction of the hinged positions at both ends of the tie rod is lateral rotation; the rotation direction of the hinged position between the left steering arm and the front end of the piston rod is lateral rotation; the rotation direction of the hinged position between the right steering arm and the front end of the piston rod is lateral rotation; and the rotation direction of the hinged positions between the rear end of the cylinder body and the left and right hinge seats is longitudinal rotation.

[0013] The connection methods for the double-arm crank connection structure include: When the lock nut is tightened, the limiting pin is pulled toward the pin shaft by the tightening force of the lock nut. The tightening force generated by the lock nut is applied to the first plane through the locking inclined surface, squeezing the pin shaft until the pin shaft contacts the inner circumferential surface of the first through hole, thus restricting the movement of the pin shaft relative to the first through hole in the radial and circumferential directions. Under the action of the reverse force, the limiting pin contacts the inner circumferential surface of the second through hole. The slope setting of the locking slope of the limiting pin enables the limiting pin to have self-locking ability under the reverse force of the pin shaft, preventing the limiting pin from loosening and falling off.

[0014] Preferably, the locking bevel contacts the first plane, and the anti-loosening nut is installed on the external thread of the limit pin. The width of the first plane is equal to the maximum width of the locking bevel. When the locking plane of the limit pin contacts the first plane of the pin, the pin will exert a shearing effect on the limit pin when it moves along the first central axis, thus restricting the axial movement of the pin along the first central axis.

[0015] The technical effects of this invention include: The present invention has a simple structure and can simultaneously fix the double cranks relative to the pin in the axial, radial and circumferential directions. This avoids relative rotation or axial movement between the double cranks and the pin when under force, thereby avoiding abnormal wear caused by relative movement between the double cranks and the pin during use, and improving the reliability and safety of the connection.

[0016] After the limiting pin is installed into the second through hole of the double-arm crank, the locking bevel of the limiting pin contacts the first plane of the pin shaft, and the anti-loosening nut is installed on the external thread of the end of the limiting pin. When the anti-loosening nut is tightened, the limiting pin is further pulled towards the pin shaft by the tension force of the anti-loosening nut. The tension force generated by the anti-loosening nut is entirely applied to the first plane of the pin shaft through the locking bevel, thereby squeezing the pin shaft until it contacts the inner circumferential surface of the first through hole of the double-arm crank, restricting the movement of the pin shaft relative to the first through hole in the radial and circumferential directions. Correspondingly, the limiting pin contacts the inner circumferential surface of the second through hole of the double-arm crank under the action of the reverse force. The slope setting of the locking bevel of the limiting pin enables the limiting pin to have self-locking capability under the reverse force of the pin shaft, and the limiting pin will not loosen or fall off, ensuring the reliability of the connection.

[0017] The width of the first plane on the pin is equal to the maximum width of the locking slope of the limiting pin. When the locking plane of the limiting pin is in reliable contact with the first plane of the pin, the movement of the pin along the first central axis will generate a shearing effect on the limiting pin, and the limiting pin will restrict the movement along the axial direction. Attached Figure Description

[0018] Figure 1 This is an axonometric view of the area near the steering mechanism 80 of the mining vehicle 1 in this invention; Figure 2 yes Figure 1 A magnified view of the vicinity of the double-arm crank 81; Figure 3 This is a partial longitudinal sectional view of the pin 87 position in this invention. Figure 4 This is a partial lateral sectional view of the pin 87 position in this invention. Figure 5 This is a partial isometric view of the double-arm crank 81 in this invention. Figure 6a This is an isometric view of pin 87 in this invention; Figure 6b This is a partial side view of the pin 87 in this invention. Figure 7a This is an isometric view of the limiting pin 88 in this invention; Figure 7b This is a partial top view of the limiting pin 88 in this invention. Figure 7c This is a side view of the limiting pin 88 in this invention.

[0019] Explanation of reference numerals in the attached figures 1- Mining truck; 2-Frame, 21-Base, 21a-Upper through hole, 21b-Lower through hole; 3-Front suspension cylinder; 4-Front axle; 5-Wheel hub; 6-Tire and rim assembly; 80 - Steering mechanism; 81-Double-arm crank, 81a-First through hole, 81b-Second through hole; 82-Left steering arm; 83-Right steering arm (not shown in the figure); 84-Tie rod; 85-Left steering cylinder; 86-Right steering cylinder; 87 - Pin, 87a - First plane; 88 - Limit pin, 88a - Locking bevel, 88b - Second plane, 88c - External thread; 89- Anti-loosening nut; 9-Upper sliding bearing; 10-Lower sliding bearing; 11-Thrust bearing; S1 - First width; S2 - Second width; T1 - First included angle; T2 - Second included angle; O - Central axis; O1 - First central axis; O2 - Second central axis. Detailed Implementation

[0020] The following description fully illustrates specific embodiments of the present invention to enable those skilled in the art to practice and reproduce it. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The following describes in detail the specific embodiments of the mining truck double-arm crank connection structure, components and connection method involved in this invention.

[0024] The direction along the central axis O is called the "axial direction". The tangent direction at any point of rotation about the central axis O is called the "circumferential direction". The direction that intersects the central axis O and is perpendicular to the central axis O is called the "radial direction". Refer to the directions shown in the attached figure to distinguish the up, down, left, and right directions.

[0025] like Figure 1 The diagram shown is an axonometric view of the area near the steering mechanism 80 of the mining vehicle 1 in this invention. It shows the installation positions of the steering mechanism 80, frame 2, front suspension cylinder 3, front axle 4, wheel hub 5, wheel rim assembly 6, and tire 7 of the mining vehicle 1. The side closer to the frame 2 is the inner side, and the side farther from the frame 2 is the outer side.

[0026] The mining car 1 includes: frame 2, front suspension cylinder 3, front axle 4, wheel hub 5, wheel rim assembly 6, tire 7, and steering mechanism 80.

[0027] The frame 2 is the main supporting component of the mining car 1. A base 21 is provided at the middle of the rear side of the frame 2. The base 21 is welded and fixedly connected to the frame 2 as a whole.

[0028] The left and right sides of the frame 2 are respectively fixed with front suspension cylinders 3, and the piston rods of the left and right front suspension cylinders 3 can extend and retract independently.

[0029] The front axle 4 is located at the lower end of the front suspension cylinder 3 and is integrally fixedly connected to the piston rod of the front suspension cylinder. The left and right front axles 4 can move up and down independently along the central axis of the front suspension cylinder 3 and can rotate around the central axis of the front suspension cylinder 3.

[0030] The wheel hub 5 is supported on the front axle 4 in a rotatable manner. The wheel rim assembly 6 is integrally fixed to the wheel hub 5, and the tire 7 is mounted on the wheel rim assembly 6.

[0031] The steering mechanism 80 is hinged to the base 21 on the inside and to the front axle 4 on both sides.

[0032] like Figure 2 As shown, is Figure 1 A magnified view of a portion of the area near the double-arm crank 81; as shown. Figure 3 The image shown is a partial longitudinal sectional view of the pin 87 in this invention; it illustrates the connection relationship between the pin 87 and the base 21, the double-arm crank 81, and the limiting pin 88.

[0033] The base 21 has an upper through hole 21a and a lower through hole 21b on the side near the steering mechanism 80. The upper through hole 21a and the lower through hole 21b are coaxial and located on the first central axis O1. The base 21 has a left hinge seat and a right hinge seat on its upper two sides, respectively.

[0034] The steering mechanism 80 is located between the frame 2 and the two front axles 4 on both sides, and includes: base 21, double crank 81, left steering arm 82, right steering arm 83, tie rod 84, left steering cylinder 85, right steering cylinder 86, pin 87, limit pin 88, and anti-loosening nut 89.

[0035] The double-arm crank 81 has a first through hole 81a on its inner side and a left hinge hole and a right hinge hole on its outer ends, respectively. A pin 87 is installed in the upper through hole 21a, the first through hole 81a, and the lower through hole 21b, enabling the double-arm crank 81 to be hinged to the base 21. The double-arm crank 81 is connected to the support 21 via the pin 87 in a manner that allows it to rotate around the first central axis O1. An upper sliding bearing 9 and a lower sliding bearing 10 are respectively installed at the hinge positions between the pin 87 and the upper through hole 21a and the lower through hole 21b of the support 21. Thrust bearings 11 are respectively installed between the double-arm crank 81 and the lower end face of the upper through hole 21a, and between the upper end face of the lower through hole 21b.

[0036] The left steering arm 82 and the right steering arm 83 are integrally fixedly connected to the left front axle and the right front axle, respectively.

[0037] A tie rod 84 is hinged between the left hinge hole of the double-arm crank 81 and the left steering arm 82, and between the right hinge hole and the right steering arm 83. The rotation direction of the hinged positions at both ends of the tie rod 84 is lateral rotation.

[0038] The left steering cylinder 85 is hinged between the left steering arm 82 and the base 21; the rear end of the cylinder body and the front end of the piston rod of the left steering cylinder 85 are respectively hinged to the left steering arm 82 and the left hinge seat of the base 21; the rotation direction of the hinge position between the left steering arm 82 and the front end of the piston rod is lateral rotation, and the rotation direction of the hinge position between the rear end of the cylinder body and the left hinge seat is longitudinal rotation.

[0039] The right steering cylinder 86 is hinged between the right steering arm 83 and the base 21; the rear end of the cylinder body and the front end of the piston rod of the right steering cylinder 86 are respectively hinged to the right steering arm 83 and the right hinge seat of the base 21; the rotation direction of the hinge position between the right steering arm 83 and the front end of the piston rod is lateral rotation, and the rotation direction of the hinge position between the rear end of the cylinder body and the right hinge seat is longitudinal rotation.

[0040] like Figure 4 The image shown is a partial transverse sectional view of the pin 87 in this invention, further illustrating the connection relationship between the pin 87 and the limiting pin 88; as shown... Figure 5 The image shown is a partial isometric view of the double-arm crank 81 in this invention, illustrating the relative positions of the first through hole 81a and the second through hole 81b on the double-arm crank 81; as shown... Figure 6a The figure shown is an isometric view of the pin 87 in this invention; as shown Figure 6b The image shown is a partial side view of the pin 87 in this invention, illustrating the detailed structure of the pin 87.

[0041] The double-arm crank 81 is plate-shaped, with a first through hole 81a extending longitudinally and a second through hole 81b extending transversely on its inner side. The first through hole 81a and the second through hole 81b intersect. The first central axis O1 of the first through hole 81a and the second central axis O2 of the second through hole 81b are perpendicular to each other, and the first central axis O1 of the first through hole 81a and the second central axis O2 of the second through hole 81b do not intersect.

[0042] The pin 87 is installed in the first through hole 81a and the upper through hole 21a and lower through hole 21b of the base 21. The first through hole 81a is located between the upper through hole 21a and the lower through hole 21b, so as to realize the hinge connection between the double-arm crank 81 and the base 21.

[0043] like Figure 7a The figure shown is an isometric view of the limiting pin 88 in this invention; as shown Figure 7b The image shown is a partial top view of the limiting pin 88 in this invention; as shown... Figure 7c The image shown is a side view of the limiting pin 88 in this invention. The detailed structure of the limiting pin 88 is shown.

[0044] The double-arm crank connection structure of the mining car includes: double-arm crank 81, pin 87, limit pin 88, and anti-loosening nut 89.

[0045] The pin 87 is a cylinder extending axially, and a first plane 87a is provided on its outer circumference, which penetrates tangentially. Inclined surfaces are provided on both sides of the first plane 87a. The width of the first plane 87a is a first width S1, and the angle between the inclined surfaces on both sides of the first plane 87a and the vertical surface is a first included angle T1.

[0046] The limiting pin 88 is an axially extending cylinder, with a locking bevel 88a and a second plane 88b extending tangentially through its outer circumference. The locking bevel 88a connects to the second plane 88b, and an external thread 88c is provided on the outer circumference of the limiting pin 88 at the end of the second plane 88b. The maximum width of the locking bevel 88a is the same as the width of the second plane 88b, i.e., the second width S2. The angle between the tangent at the intersection of the line of intersection of the locking bevel 88a and the second plane 88b and the outer circumference and the plane of symmetry of the locking bevel 88a is the second angle T2.

[0047] The width of the first plane 87a is equal to the maximum width of the locking ramp 88a. The first included angle T1 is greater than or equal to the second included angle T2.

[0048] The limiting pin 88 is installed in the second through hole 81b of the double-arm crank 81. The locking bevel 88a of the limiting pin 88 contacts the first plane 87a of the pin shaft 87, and the anti-loosening nut 89 is installed on the external thread 88c of the limiting pin 88.

[0049] The present invention further provides a connection method for a double-arm crank connection structure of a mining truck, comprising: After the limit pin 88 is installed into the second through hole 81b of the double-arm crank 81, the locking slope 88a of the limit pin 88 contacts the first plane 87a of the pin shaft 87, and the anti-loosening nut 89 is installed on the external thread 88c of the limit pin 88.

[0050] When the lock nut 89 is tightened, the limiting pin 88 is further pulled towards the pin 87 by the tension force of the lock nut 89. The tension force generated by the lock nut 89 is applied to the first plane 87a of the pin 87 via the locking inclined surface 88a, thereby pressing the pin 87 until it contacts the inner circumferential surface of the first through hole 81a of the double-arm crank 81, restricting the radial and circumferential movement of the pin 87 relative to the first through hole 81a. This achieves the connection between the pin 87 and the double-arm crank 81, as well as their synchronous rotation.

[0051] Correspondingly, under the action of the reverse force, the limiting pin 88 contacts the inner circumferential surface of the second through hole 81b of the double-arm crank 81. The slope setting of the locking slope 88a of the limiting pin 88 enables the limiting pin 88 to have self-locking capability under the reverse force of the pin shaft 87. Therefore, the limiting pin 88 will not loosen or fall off, ensuring the reliability of the connection.

[0052] The width of the first plane 87a on the pin 87 is equal to the maximum width of the locking slope 88a of the limiting pin 88. When the locking plane of the limiting pin 88 reliably contacts the first plane 87a of the pin 87, the pin 87 will exert a shearing effect on the limiting pin 88 when it moves along the first central axis O1, and the pin 87 is restricted from axial movement along the first central axis O1 by the limiting pin 88.

[0053] The piston rod of the left steering cylinder 85 extends, pushing the left steering arm 82 to rotate to the left. The left steering arm 82 drives the left front axle 4 to rotate to the left, and the left front axle 4 drives the wheel hub 5 and tire 7 to rotate to the left. At the same time, the piston rod of the right steering cylinder 86 retracts, pulling the right steering arm 83 to rotate to the left. The right steering arm 83 drives the wheel hub 5 and tire 7 to rotate to the left. The same principle applies to rotating to the right, thus achieving the steering of the mining truck.

[0054] The double-arm crank connection structure and connection method of the mining truck according to the above scheme are suitable for steering mechanisms 80 with independent front suspension. The detachable mechanical connection structure ensures that the double-arm crank 81 and pin 87 maintain a reliable fixed connection even when continuously subjected to oblique forces, preventing relative movement and abnormal wear failure. This improves the reliability of the connection, thereby enhancing the safety and operating efficiency of the mining truck.

[0055] The specific embodiments of the present invention have been described in detail above, but the terminology used is descriptive and exemplary, not restrictive. The above embodiments are merely examples, and the present invention includes, but is not limited to, the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be understood as being covered within the scope of the present invention.

Claims

1. A double-arm crank connection structure for a mining truck, characterized in that, include: The device includes a double-arm crank, a pin, a limiting pin, and a lock nut. The double-arm crank has a first through hole extending longitudinally and a second through hole extending laterally on its inner side. The first through hole and the second through hole intersect each other and are perpendicular to each other. The double-arm crank has a left hinge hole and a right hinge hole at its outer ends, respectively. The pin is installed in the first through hole. The outer circumference of the pin has a first plane that penetrates tangentially, and both sides of the first plane have inclined surfaces. The limiting pin is installed in the second through hole. The outer circumference of the pin has a locking inclined surface that penetrates tangentially and a second plane. The locking inclined surface is connected to the second plane. The outer circumference of the limiting pin at the end of the second plane has an external thread, and the lock nut is installed on the external thread.

2. The double-arm crank connection structure of the mining car as described in claim 1, characterized in that, The double-arm crank is plate-shaped, while the pin and locating pin are cylindrical in shape.

3. The double-arm crank connection structure of the mining car as described in claim 1, characterized in that, The first through hole is located on the first central axis, and the second through hole is located on the second central axis. The first central axis and the second central axis are perpendicular to each other and do not intersect.

4. The double-arm crank connection structure of the mining car as described in claim 1, characterized in that, The first plane is in contact with the locking ramp and the second plane.

5. The double-arm crank connection structure of the mining car as described in claim 1, characterized in that, The width of the first plane is equal to the maximum width of the locking ramp. The angle between the ramp and the vertical plane on both sides of the first plane is the first included angle T1. The angle between the tangent line passing through the intersection of the locking ramp and the second plane and the intersection of the outer peripheral surface and the symmetrical surface of the locking ramp is the second included angle T2. The first included angle T1 ≥ the second included angle T2.

6. A steering mechanism, characterized in that, include: The base comprises a left steering arm, a right steering arm, a tie rod, a left steering cylinder, a right steering cylinder, and a double-arm crank connection structure for a mining vehicle as described in any one of claims 1-5. The base is provided with an upper through hole and a lower through hole, which are coaxially located on a first central axis. A left hinge seat and a right hinge seat are respectively provided on the upper two sides of the base. A pin is installed in the first through hole, the upper through hole, and the lower through hole. The first through hole is located between the upper through hole and the lower through hole. The left steering cylinder is hinged between the left steering arm and the left hinge seat. The right steering cylinder is hinged between the right steering arm and the right hinge seat. Tie rods are respectively hinged between the left hinge hole, the left steering arm, and the right hinge hole and the right steering arm.

7. The steering mechanism as described in claim 6, characterized in that, Upper and lower sliding bearings are respectively installed at the hinge positions between the pin and the upper and lower through holes. Thrust bearings are respectively installed between the double-arm crank and the lower end face of the upper through hole and the upper end face of the lower through hole.

8. The steering mechanism as described in claim 6, characterized in that, The rear end of the cylinder body and the front end of the piston rod of the left steering cylinder are hinged to the left steering arm and the left articulation seat, respectively. The rear end of the cylinder body and the front end of the piston rod of the right steering cylinder are hinged to the right steering arm and the right articulation seat, respectively. The rotation direction of the hinged positions at both ends of the tie rod is lateral rotation. The rotation direction of the hinged position between the left steering arm and the front end of the piston rod is lateral rotation. The rotation direction of the hinged position between the right steering arm and the front end of the piston rod is lateral rotation. The rotation direction of the hinged positions between the rear end of the cylinder body and the left and right articulation seats is longitudinal rotation.

9. The connection method of the double-arm crank connection structure of the mining car as described in any one of claims 1-5, characterized in that, include: When the lock nut is tightened, the limiting pin is pulled toward the pin shaft by the tightening force of the lock nut. The tightening force generated by the lock nut is applied to the first plane through the locking inclined surface, squeezing the pin shaft until the pin shaft contacts the inner circumferential surface of the first through hole, thus restricting the movement of the pin shaft relative to the first through hole in the radial and circumferential directions. Under the action of the reverse force, the limiting pin contacts the inner circumferential surface of the second through hole. The slope setting of the locking slope of the limiting pin enables the limiting pin to have self-locking ability under the reverse force of the pin shaft, preventing the limiting pin from loosening and falling off.

10. The connection method as described in claim 9, characterized in that, The locking bevel contacts the first plane, and the anti-loosening nut is installed on the external thread of the limit pin. The width of the first plane is equal to the maximum width of the locking bevel. When the locking plane of the limit pin contacts the first plane of the pin, the pin will exert a shearing effect on the limit pin when it moves along the first central axis, thus restricting the axial movement of the pin along the first central axis.

Images