Mechanism for limiting rotation motion angle

Abstract

The invention provides a mechanism for limiting a rotating motion angle, which belongs to the field of mechanical structures, is particularly suitable for limiting a rotating angle of a main shaft in a ZD6 switch machine structure, and comprises an annular part and a prolate part which are respectively provided with a first inner hole and a second inner hole; the annular part and the flat and long part are attached to each other, and the first inner hole and the second inner hole are coaxial. The first inner hole is of a spline structure and is matched with a spindle spline; the minimum inner diameter of the second inner hole is larger than the outer diameter of the spline structure. The mutually attached end surfaces of the annular part and the flat and long part are respectively provided with a boss and a groove for accommodating the boss which are matched with each other; the face, away from the circle center, of the groove is an arc face, and the circle center of the arc face coincides with the circle center of the spline structure. And the groove and the boss are nested and matched by using a jaw. According to the mechanism, the collision between the stop bolt and the stop pile is converted into the collision between the small end of the prolate part and the stop pile, and then the prolate part and the jaw structure of the annular part are collided, so that the stress section is enlarged, the strength of the part is improved, and the impact life of the part is prolonged.

Description

Technical Field

[0001] The invention relates to the field of mechanical structures, and in particular to a mechanism for limiting a rotational motion angle. Background Art

[0002] The ZD6 type switch machine is the most widely used turnout switching equipment in my country's railway transportation. It is widely used in national railway conventional lines, urban rail transit, and factory and mine enterprise transportation lines. Whether it can work normally has a great impact on the transportation efficiency of the line and even affects transportation safety.

[0003] The ZD6 switch machine drives the rack block to move by rotating the locking gear, which in turn causes the operating rod to extend and retract to switch the turnout. After the locking gear rotates to the final position, the locking arc fits with the rack block locking arc, achieving mechanical locking and locking the turnout point rail. Among them, the locking gear and the stop bolt are connected to the main shaft through splines, and the three move together, such as Figure 1 As shown. Since the moving parts still have residual kinetic energy after the motor is powered off, if the main shaft stops at a position exceeding the designed angle, it is possible that the connected indicating contacts will be disconnected again. Therefore, the ZD6 switch machine is designed with a stop pile 8 and a stop bolt 7 to limit the stop angle of the main shaft, as shown in the figure. Figure 2 shown.

[0004] During use, each movement of the ZD6 switch machine will cause a collision between the stop bolt and the stop pile to consume the remaining energy. Due to structural limitations, the connection section between the collision position of the stop bolt 7 and the body is relatively small, which is prone to fatigue. Figure 3 As shown, there have been many cases of failures without indication caused by the breakage of the stop bolt 7 with a relatively long service life, which have affected the operation order of the vehicle and caused certain economic losses. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a mechanism for limiting the angle of rotational movement, which converts the collision between the stop bolt and the stop pile into a collision between the small end of the elongated part and the stop pile. The elongated part and the annular part move relative to each other, causing friction or deformation of the spring, and then the tooth structures of the elongated part and the annular part collide. During this process, energy is consumed by the friction of the parts or the deformation of the spring, which reduces the energy of the collision of the tooth structure. In addition, the force-bearing cross-section and the collision cross-section of the tooth structure are increased relative to the original stop bolt and stop pile structure, thereby reducing the stress level of the collision process. Without changing the material properties, the impact life of the parts is extended.

[0006] The present invention provides the following technical solutions:

[0007] A mechanism for limiting the angle of rotational movement, comprising an annular part and an elongated part, each having a first inner hole and a second inner hole;

[0008] The annular part and the elongated part fit each other; the annular part has a first inner hole, which is a spline structure and matches with the main shaft spline; the elongated part has a second inner hole, and the minimum inner diameter of the second inner hole is larger than the outer diameter of the spline structure; the first inner hole and the second inner hole are coaxial;

[0009] The end surfaces of the annular part and the elongated part that fit each other have bosses that fit each other and grooves that accommodate the bosses; the surfaces of the bosses and the grooves that are away from the center of the circle are arc surfaces;

[0010] The groove and the boss form a tooth-embedded structure for nesting and matching; the two can rotate relative to each other and the rear end surfaces contact and stop each other.

[0011] Preferably, there is friction material between the contact surfaces of the annular part and the elongated part, and when the annular part and the elongated part rotate relatively, the elongated part will be subjected to friction.

[0012] Preferably, the friction material is an elastic material.

[0013] Preferably, an elastic element is provided between the fitting surfaces of the annular part and the elongated part.

[0014] Preferably, the elastic element is a torsion spring.

[0015] Preferably, the central angle corresponding to the groove profile is greater than the central angle corresponding to the boss profile.

[0016] Preferably, the groove is located on the end face of the elongated part, and the boss is located on the end face of the annular part; or, the groove is located on the end face of the annular part, and the boss is located on the end face of the elongated part.

[0017] Beneficial effects of the present invention:

[0018] The present invention proposes a mechanism for limiting the angle of rotational movement. By adjusting the relative rotation angle change between the annular part and the elongated part, a larger range of rotation angle restrictions can be accommodated. The friction effect during the relative rotation process between the annular part and the elongated part can reduce the energy during the boss and groove collision stopper, thereby extending the impact life of the parts. According to the energy and stress of the impact process, the boss connection section and the groove remaining section that meet the requirements can be designed, and the design restrictions are small, allowing for flexible design. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the ZD6 spindle structure diagram;

[0020] Figure 2 It is a schematic diagram of the cooperation between the stop bolt and the stop pile in the prior art;

[0021] Figure 3It is a schematic diagram of the stop bolt structure in the prior art;

[0022] Figure 4 is a schematic diagram of the structure of the annular part in this embodiment 1;

[0023] Figure 5 It is a schematic diagram of the structure of the elongated part in the present embodiment 1;

[0024] Figure 6 This is a schematic diagram of the nested cooperation of the annular part and the elongated part in the first embodiment;

[0025] Figure 7 This is a schematic diagram of the assembly of the annular part and the elongated part in this embodiment 1;

[0026] Figure 8 This is a schematic diagram of the assembly of the annular part and the elongated part in this embodiment 2;

[0027] Fig. 9 This is a schematic diagram of the assembly of the annular part and the elongated part in this embodiment 3;

[0028] In the figure, 1, annular part; 2, elongated part; 3, first inner hole; 4, second inner hole; 5, boss; 6, groove; 7, stop bolt; 8, stop pile. DETAILED DESCRIPTION

[0029] 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 intended to limit the present invention.

[0030] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] Example 1

[0033] Each time the ZD6 switch machine moves, the stop bolt and the stop pile will collide to consume the remaining energy. Due to structural limitations, the connection section between the collision position of the stop bolt and the body is relatively small, which is prone to fatigue fracture due to multiple impacts.

[0034] To this end, this embodiment proposes a mechanism for limiting the rotation angle, and replaces the stop bolt with the structure of the present invention. When limiting the rotation, the small end of the elongated part 2 collides with the stop post and the tooth structure of the elongated part 2 collides with the annular part 1, and finally the spindle stops at the set position. Specifically, Figure 4-Figure 6 As shown, Figure 4 The end face of the annular part 1 has a boss 5. Figure 5 The elongated part 2 has a groove 6. Figure 6 The two are nested to form a tooth-embedded structure. Figure 7 The schematic diagram of the assembly structure is shown in FIG. 1 . Specifically, the ring part 1 and the elongated part 2 have a first inner hole 3 and a second inner hole 4 respectively; wherein, the inner hole of the ring part 1 is a spline structure, which cooperates with the main shaft spline; the end face of the ring part 1 that cooperates with the elongated part 2 has a boss 5. The inner hole of the elongated part 2 is larger than the outer diameter of the main shaft spline, and the elongated part 2 has a groove 6 for accommodating the boss 5. The groove 6 is connected to the inner hole, and the outer wall of the groove 6 is an arc surface with the rotation center as the center of the circle. The two ends of the boss 5 respectively form a stop surface with the two ends of the groove 6, and the two form a nested matching structure with a certain relative rotation angle, that is, the two can rotate relative to each other by a limited angle, and the edges of the boss 5 and the groove 6 contact, so that the two cannot continue to rotate relative to each other in the same direction, but can rotate relative to each other in the opposite direction. After the boss 5 and the other edge of the groove 6 contact, the two cannot continue to rotate relative to each other in the same direction.

[0035] The boss 5 in this embodiment is an arc-shaped boss 5, the outer wall surface of which is an arc surface, and the inner wall is an extended surface of the spline. The boss 5 structure can also be a cylindrical, square column or other structure.

[0036] The improved structure of this embodiment is that the small end of the elongated part 2 collides with the stop post, and then the elongated part 2 collides with the tooth structure of the annular part 1, and finally the main shaft stops at the set position. The end of the elongated part 2 collides with the stop bolt as a whole, and there is no dangerous section. By selecting an appropriate size, its section can be equivalent to the section of the stop post, and the same strength of the two can be achieved. After the boss 5 collides with the wall of the groove 6, the annular part 1 and the elongated part 2 are both subjected to shear force. Since the shear surface is significantly larger than the original shear surface of the stop bolt, when the same material is used, the number of impacts and collisions it withstands increases, and the ability to withstand static loads also increases, that is, the impact fatigue life increases.

[0037] In another embodiment, the groove 6 is located on the end surface of the annular part 1, and the boss 5 is located on the end surface of the elongated part 2, that is, the positions of the boss 5 and the groove 6 are interchangeable, and the two can also form a tooth-embedded structure for replacing the stop bolt.

[0038] Example 2

[0039] Special, such as Figure 8 As shown, the groove 6 of the flat and long part 2 of the present invention is opened on the outer wall surface, and the two ends of the groove 6 are stop surfaces. The arc-shaped inner wall surface of the boss 5 of the annular part 1 is slidably matched with the wall surface of the groove 6 to form a tooth-embedded structure.

[0040] Example 3

[0041] Particularly, the boss 5 of the annular part 1 in the present invention is a cylindrical boss 5, or a prismatic boss 5, such as Fig. 9 As shown, Fig. 9 The cylindrical boss 5 and the groove 6 form a tooth-embedded structural relationship, and the contact surfaces of the two are arc surfaces, and no interference occurs during rotation.

[0042] Example 4

[0043] In this embodiment, friction material is added between the two parts to consume kinetic energy by friction. Furthermore, two torsion springs with opposite rotation directions can be arranged between the two parts, or a torsion spring can be composed of two parts with different rotation directions. The torsion spring structure restricts the relative movement of the two parts in two directions, so that the two parts are in the middle position when not subjected to external force, so that the edges on both sides of the boss 5 and the groove 6 do not contact each other.

[0044] In this embodiment, the mechanism separates the stop bolt into an annular part 1 and an elongated part 2. When limiting the rotation, the small end of the elongated part 2 collides with the stop post and the tooth structure of the elongated part 2 collides with the annular part 1 to limit the rotation, and finally the spindle stops at the set position. The end of the elongated part 2 of the present invention collides with the stop bolt as a whole, and there is no dangerous section. By selecting an appropriate size, its section can be equivalent to the section of the stop post, achieving equal strength of the two.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanism for limiting the angle of rotational motion, characterized in that: It comprises a ring-shaped part (1) and a flat and long part (2); The annular part (1) and the elongated part (2) fit each other; the annular part (1) has a first inner hole (3), the first inner hole (3) is a spline structure, and cooperates with the main shaft spline; the elongated part (2) has a second inner hole (4), the minimum inner diameter of the second inner hole (4) is larger than the outer diameter of the spline structure; the first inner hole (3) and the second inner hole (4) are coaxial; The end surfaces of the annular part (1) and the elongated part (2) that fit each other have mutually matching bosses (5) and grooves (6) for accommodating the bosses (5); the surface of the groove (6) away from the center of the circle is an arc surface, and the center of the arc surface coincides with the center of the spline structure; The groove (6) and the boss (5) form a tooth-embedded structure for nested cooperation; the two can rotate relative to each other and the rear end surfaces contact and stop each other.

2. The mechanism for limiting the rotation angle according to claim 1, characterized in that: There is friction material between the fitting surfaces of the annular part (1) and the elongated part (2). When the annular part (1) and the elongated part (2) rotate relative to each other, the elongated part (2) will be subjected to the action of friction force.

3. The mechanism for limiting the rotation angle according to claim 2, characterized in that: The friction material is an elastic material.

4. The mechanism for limiting the rotational motion angle according to claim 1, characterized in that: An elastic element is provided between the fitting surfaces of the annular part (1) and the elongated part (2).

5. The mechanism for limiting the rotational motion angle according to claim 4, characterized in that: The elastic element is a torsion spring.

6. The mechanism for limiting the rotational motion angle according to claim 1, characterized in that: The center angle corresponding to the contour of the groove (6) is greater than the center angle corresponding to the contour of the boss (5).

7. The mechanism for limiting the rotational motion angle according to claim 1, characterized in that: The groove (6) is located on the end surface of the elongated part (2), and the boss (5) is located on the end surface of the annular part (1); or, the groove (6) is located on the end surface of the annular part (1), and the boss (5) is located on the end surface of the elongated part (2).

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