Scissor fork assembly

Abstract

A scissor fork assembly comprises a connecting shaft body, a connecting shaft fixing plate, a first fork arm and a second fork arm, the connecting shaft body is fixedly connected with the first fork arm, the connecting shaft fixing plate is arranged at one end of the connecting shaft body in the axial direction and detachably connected with at least one of the connecting shaft body and the first fork arm, and the second fork arm is arranged on the connecting shaft fixing plate. And the second fork arm is rotatably connected with the connecting shaft body. The connecting shaft body and the connecting shaft fixing plate are separately arranged and are sequentially connected with the first fork arm, so that the assembly fault tolerance during mounting of the connecting shaft fixing plate and the first fork arm is greatly improved, and the positioning difficulty during assembly of the connecting shaft body, the connecting shaft fixing plate and the scissor fork arm is reduced. And during later maintenance, the connecting shaft fixing plate can be independently detached, and then the connecting shaft fixing plate or other parts can be replaced or repaired, so that the later maintenance of the scissor fork assembly is extremely convenient, and the cost is relatively low.

Description

Technical Field

[0001] The utility model relates to the field of multi-connecting rod transmission structures, in particular to a scissors fork assembly. Background Art

[0002] The scissor fork structure is a multi-link transmission structure widely used in lifting equipment, variable pitch equipment and various types of drive equipment. In the scissor fork structure, the scissor fork arms, which are important components, are generally connected in a transmittable manner by a connecting shaft that passes through two adjacent scissor fork arms at the same time.

[0003] The common connecting shafts currently on the market are of an integrated structure, i.e., the portion of the connecting shaft that axially penetrates the scissor fork arm and the portion of the connecting shaft that is located outside the scissor fork arm and is fixed to the scissor fork arm are integrally formed. Furthermore, since the portion of the connecting shaft that axially penetrates the scissor fork arm is usually larger than the inner diameter of the through hole in the scissor fork arm, that is, the portion of the connecting shaft that axially penetrates the scissor fork arm and the scissor fork arm are interference-fitted, this makes relative positioning of the connecting shaft and the scissor fork arm difficult and inefficient during assembly. Since assembly requires hammering, if positioning cannot be successfully completed in one go, repeated positioning and disassembly of the connecting shaft will cause wear on the surface of the connecting shaft and the related through holes in the scissor fork arm.

[0004] In addition, due to the axial force applied to the scissor fork structure during operation and the axial force generated by the long-term operation of the connection position between the connecting shaft and the scissor fork arm, the connecting shaft is not easy to be removed from the scissor fork arm after being used for a period of time, making this connecting shaft structure difficult to maintain in the later stage. Summary of the Invention

[0005] The utility model provides a scissors fork assembly with low installation difficulty and low subsequent maintenance difficulty, including a connecting shaft body, a connecting shaft fixing plate, a first fork arm and a second fork arm, the connecting shaft body is fixedly connected to the first fork arm, the connecting shaft fixing plate is arranged at one end of the connecting shaft body in the axial direction, and is detachably connected to the connecting shaft body and at least one of the first fork arm, and the second fork arm is rotatably connected to the connecting shaft body.

[0006] Furthermore, it also includes a wear-resistant device, which is used to reduce the wear caused by the relative rotation between the first fork arm and the second fork arm and / or the wear caused by the relative rotation between the second fork arm and the connecting shaft body.

[0007] Furthermore, the wear-resistant device includes a first washer, which is sleeved on the connecting shaft body and clamped between the first fork arm and the second fork arm in the axial direction of the connecting shaft body.

[0008] Furthermore, a first through hole is formed on the first fork arm, the connecting shaft body is passed through the first through hole, and the first fork arm is fixedly connected to the connecting shaft body as a whole through an interference fit between the first through hole and the connecting shaft body.

[0009] Furthermore, the wear-resistant device includes a second washer, which is arranged on the second fork arm and rotatably connected to the connecting shaft body, and the second washer is clamped between the connecting shaft body and the second fork arm along the radial direction of the connecting shaft body.

[0010] Furthermore, a second through hole is provided on the second fork arm, the connecting shaft body is passed through the second through hole, the second washer is clamped between the inner surface of the second through hole and the outer surface of the connecting shaft body, and is fixedly connected to the second fork arm through interference fit.

[0011] Furthermore, the connecting shaft assembly also includes a shaft stopper, which is detachably arranged at the other end of the connecting shaft body opposite to the connecting shaft fixing plate in the axial direction, and the shaft stopper is used to limit the second fork arm along the axial direction of the connecting shaft body to prevent the second fork arm from falling off from the connecting shaft body.

[0012] Furthermore, the connecting shaft body includes a first positioning portion, which is recessed at one end of the connecting shaft body close to the connecting shaft fixing plate. The first positioning portion is used to cooperate with the second positioning portion on the connecting shaft fixing plate to position the relative position of the connecting shaft body and the connecting shaft fixing plate.

[0013] Furthermore, a plurality of first connection holes are provided on the circumference of the connecting shaft fixing plate, and the connecting shaft fixing plate is connected to the first fork arm through the first connection holes.

[0014] Furthermore, a second connecting hole is provided in the middle of the connecting shaft fixing plate, and the connecting shaft fixing plate is connected to the connecting shaft body through the second connecting hole.

[0015] The scissor fork assembly provided by the present invention significantly improves the assembly tolerance when installing the connecting shaft body and the connecting shaft fixing plate by disposing them as separate components, so that they are sequentially connected to the first fork arm. This reduces the difficulty of positioning the connecting shaft body, the connecting shaft fixing plate, and the scissor fork arm during assembly. The present invention also reduces the wear caused by the relative rotation of the scissor fork assembly during operation by providing wear-resistant devices disposed between the first fork arm and the second fork arm, and between the second fork arm and the connecting shaft body. In addition, during later maintenance, the connecting shaft fixing plate can be removed separately to replace or repair the connecting shaft fixing plate or other components, making the later maintenance of the scissor fork assembly extremely convenient and low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an exploded schematic diagram of the scissors fork assembly provided by the utility model (excluding the first fork arm and the second fork arm).

[0017] Figure 2 This is a schematic assembly diagram of the scissor fork assembly (excluding the first fork arm and the second fork arm) in the present invention.

[0018] Figure 3 It is a front view of the scissors fork assembly (excluding the first fork arm and the second fork arm) in the utility model.

[0019] Figure 4 It is a schematic diagram of the scissors fork assembly (including the first fork arm and the second fork arm) in the present utility model.

[0020] In the figure: 1, connecting shaft body; 2, connecting shaft fixing plate; 2a, second positioning portion; 21, first connecting hole; 22, second connecting hole; 3, first fork arm; 4, second fork arm; 5, first washer; 6, second washer; 7, shaft stop DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0022] It should be noted that the terms "first", "second", "third", "fourth", etc. in the description and claims of the present utility model are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0023] The scissor fork assembly provided by this utility model can be applied to lifting equipment, variable pitch equipment and various types of drive equipment. Figures 1 to 4 The scissors fork assembly in the utility model includes a connecting shaft body 1, a connecting shaft fixing plate 2, a wear-resistant device, a first fork arm 3, a second fork arm 4 and an axle stop 7. The connecting shaft fixing plate 2 is arranged at one end of the connecting shaft body 1 in the axial direction, and is detachably connected to the connecting shaft body 1 and at least one of the first fork arm 3. The second fork arm 4 is rotatably connected to the connecting shaft body 1. The wear-resistant device is used to reduce the wear caused by the relative rotation between the first fork arm 3 and the second fork arm 4 and / or the wear caused by the relative rotation between the second fork arm 4 and the connecting shaft body 1. The axle stop 7 is detachably arranged at the other end of the connecting shaft body 1 opposite to the connecting shaft fixing plate 2 in the axial direction, and is used to limit the second fork arm 4 along the axial direction of the connecting shaft body 1 to prevent the second fork arm 4 from falling off from the connecting shaft body 1.

[0024] Specifically, the first fork arm 3 and the second fork arm 4 in the present invention are respectively sleeved on the connecting shaft body 1, wherein the first fork arm 3 is fixedly connected to the connecting shaft body 1 by interference fit, and the second fork arm 4 is rotatably sleeved on the connecting shaft body 1, and the connecting shaft fixing plate 2 is detachably mounted on the end of the connecting shaft body 1 close to the first fork arm 3, and the shaft stop 7 is detachably mounted on the end of the connecting shaft body 1 close to the second fork arm 4. Any one of the first fork arm 3 and the second fork arm 4 is used to be connected to the driving device, that is, one of the first fork arm 3 and the second fork arm 4 is the active arm in the connecting rod device, and the other of the first fork arm 3 and the second fork arm 4 is the driven arm in the connecting rod device. However, in a preferred embodiment of the present invention, the first fork arm 3 fixedly connected to the connecting shaft body 1 is the active arm, and the second fork arm 4 rotatable relative to the first fork arm 3 and the connecting shaft body 1 is the driven arm. The present invention significantly improves the assembly tolerance when installing the connecting shaft body 1 and the connecting shaft fixing plate 2 by separating them into separate parts, which are then sequentially connected to the first fork arm 3. This also reduces the difficulty of positioning the connecting shaft body 1, the connecting shaft fixing plate 2, and the scissor fork arms during assembly. The present invention also reduces the wear caused by the relative rotation of the scissor fork assembly during operation by providing wear-resistant devices between the first fork arm 3 and the second fork arm 4, and between the second fork arm 4 and the connecting shaft body 1. In addition, during later maintenance, the connecting shaft fixing plate 2 can be removed separately to replace or repair the connecting shaft fixing plate 2 or other components, making later maintenance of the scissor fork assembly extremely convenient and low-cost.

[0025] Furthermore, the first fork arm 3 and the second fork arm 4 of the present invention are respectively provided with a first through-hole and a second through-hole, through which the connecting shaft body 1 passes, forming an interference fit and a clearance fit with the first through-hole and the second through-hole, respectively. The first fork arm 3 is integrally connected to the connecting shaft body 1 via the interference fit between the first through-hole and the connecting shaft body 1, while the second fork arm 4 is rotatably connected to the connecting shaft body 1 via the clearance fit between the second through-hole and the connecting shaft body 1.

[0026] Please refer to Figure 1 and Figure 2Furthermore, the wear-resistant device in the present invention includes a first washer 5 and a second washer 6. The first washer 5 is sleeved on the connecting shaft body 1 and is fixedly connected to the connecting shaft body 1 as a whole. The first washer 5 is clamped between the first fork arm 3 and the second fork arm 4 in the axial direction of the connecting shaft body 1, and is used to reduce the wear caused by the relative rotation between the first fork arm 3 and the second fork arm 4; the second washer 6 is arranged on the second fork arm 4 and is fixedly connected to the second fork arm 4 as a whole. The second washer 6 is rotatably connected to the connecting shaft body 1, and the second washer 6 is clamped between the connecting shaft body 1 and the second fork arm 4 along the radial direction of the connecting shaft body 1, and is used to reduce the wear caused by the relative rotation between the second fork arm 4 and the connecting shaft body 1. Specifically, in this embodiment, both the first washer 5 and the second washer 6 are maintenance-free graphite washers. The inner wall of the first washer 5 forms an interference fit with the connecting shaft body 1, so that the first washer 5 cannot slide in the axial direction of the connecting shaft body 1. The second washer 6 is fixed to the inner wall of the second through hole and is fixed to the second fork arm 4 by interference fit, welding, etc. The inner wall of the second washer 6 forms a clearance fit with the connecting shaft body 1 to achieve relative rotation of the connecting shaft body 1. The utility model reduces the wear caused by the relative rotation of the scissors fork assembly during operation by providing wear-resistant devices respectively provided between the first fork arm 3 and the second fork arm 4 and between the second fork arm 4 and the connecting shaft body 1. If the connecting shaft fixing plate 2, the first washer 5 or the second washer 6 makes an abnormal sound or operates abnormally, the connecting shaft fixing plate 2, the shaft stop 7 or the second fork arm 4 can be separately disassembled without separating the first fork arm 3 and the connecting shaft body 1, so as to remove the connecting shaft fixing plate 2, the first washer 5 or the second washer 6. The maintenance cost is low and the operation is simple.

[0027] Please refer to Figure 1 and Figure 3Furthermore, a first connecting hole 21 and a second connecting hole 22 are provided on the connecting shaft fixing plate 2 in the utility model. The connecting shaft fixing plate 2 is connected to the first fork arm 3 as a whole by a bolt passing through the first connecting hole 21, and the connecting shaft fixing plate 2 is connected to the connecting shaft body 1 as a whole by a bolt passing through the second connecting hole 22. Specifically, in this embodiment, a second connection hole 22 is provided in the middle of the connecting shaft fixing plate 2. The second connection hole 22 corresponds to the internally threaded hole defined at the axis of the connecting shaft body 1. The second connection hole 22 and the corresponding internally threaded hole are threadedly connected to the same bolt. Four first connection holes 21 are evenly spaced around the periphery of the connecting shaft fixing plate 2. The first connection holes 21 correspond to the four internally threaded holes defined on the first fork arm 3. Each first connection hole 21 and the corresponding internally threaded hole are threadedly connected to the same bolt. As can be readily understood, the first connection holes 21 are arranged in a cross-like pattern relative to the second connection holes 22. When the connecting shaft fixing plate 2 is secured to the first fork arm 3 via the first connection holes 21, the second connection holes 22 are also positioned relative to their corresponding internally threaded holes. The size and distribution of the first and second connection holes 21, 22 can be designed based on the actual dimensions of the scissor fork assembly. For example, the bolt type and connection hole size can be selected based on the dimensions of the connecting shaft body 1 and the first and second fork arms 3, 4. Generally, a larger connecting shaft body 1 requires larger bolts and connection holes to ensure connection strength. The present invention achieves a fixed connection between the connecting shaft fixing plate 2 and the connecting shaft body 1 through the first connecting hole 21 and the second connecting hole 22. The multiple first connecting holes 21 evenly distributed on the connecting shaft fixing plate 2 position the connecting shaft fixing plate 2 and the connecting shaft body 1 along the circumference of the connecting shaft body 1, reducing the difficulty of assembly and facilitating the removal of the connecting shaft fixing plate 2 during subsequent maintenance. It is understandable that in other embodiments of the present invention, only the first connecting hole 21 or the second connecting hole 22 is provided on the connecting shaft fixing plate 2, which can also achieve the function of fixing the connecting shaft fixing plate 2 to the connecting shaft body 1 and the first fork arm 3, but the connection strength of the first connecting hole 21 or the second connecting hole 22 must be ensured, for example: providing a larger number of first connecting holes 21 or second connecting holes 22; using larger first connecting holes 21 or second connecting holes 22 and corresponding bolts, etc.

[0028] Please refer to Figure 1Furthermore, the connecting shaft body 1 of the present invention is provided with a first positioning portion, which is recessed at one end of the connecting shaft body 1 near the connecting shaft fixing plate 2. The first positioning portion is used to cooperate with the second positioning portion 2a on the connecting shaft fixing plate 2 to relatively position the connecting shaft body 1 and the connecting shaft fixing plate 2, as well as the connecting shaft fixing plate 2 and the first fork arm 3. Specifically, in this embodiment, the first positioning portion is a cylindrical recess recessed at one end of the connecting shaft body 1 facing the connecting shaft fixing plate 2. The cylindrical recess is located near the axis of the connecting shaft body 1, that is, the first positioning portion is offset from the axis of the connecting shaft body 1. The second positioning portion 2a is a cylindrical boss protruding from the connecting shaft fixing plate 2, facing one end of the connecting shaft body 1. When the connecting shaft fixing plate 2 is installed, the second positioning portion 2a can be extended into the first positioning portion, cooperating with the first positioning portion to limit the relative position of the connecting shaft fixing plate 2 and the connecting shaft body 1 along the axial and circumferential directions of the connecting shaft body 1. When the connecting shaft fixing plate 2 and the connecting shaft body 1 are aligned, it is only necessary to rotate the connecting shaft fixing plate 2 so that the second connecting hole 22 and its corresponding internal threaded hole are aligned. In this way, the difficulty of aligning the connecting shaft fixing plate 2 and the connecting shaft body 1 can be reduced, and the initial positioning between the connecting shaft body 1 and the connecting shaft fixing plate 2 can be achieved. In other embodiments of the present invention, the second positioning portion 2a can also be a cylindrical boss, a triangular columnar boss, or other similar structure with a rotation-stopping and positioning effect provided on the periphery of the second connecting hole 22 on the connecting shaft fixing plate 2, and the first positioning portion is correspondingly configured as a recessed structure of matching shape.

[0029] When assembling the scissors fork assembly of the present invention, first complete the assembly of the connecting shaft fixing plate 2, the connecting shaft body 1 and the first fork arm 3: set a buffer pad under the first fork arm 3, knock the connecting shaft body 1 into the first fork arm 3, then take the connecting shaft fixing plate 2, and use the first positioning part and the second positioning part 2a to preliminarily position the connecting shaft fixing plate 2 on the connecting shaft body 1, and then use bolts to pass through the first connecting hole 21 and the second connecting hole 22 respectively to realize the fixed connection between the connecting shaft fixing plate 2 and the connecting shaft body 1 and the first fork arm 3. In order to make the connection more firm, a spring-flattening combination gasket or a neutral thread glue can also be used when fixing with bolts to prevent the bolts from loosening after long-term use; then, complete the assembly of the second fork arm 4: set a buffer pad under the second washer 6, and knock the second washer 6 into the second fork arm 4. Finally, complete the overall assembly: Take the first washer 5 and slide it onto the connecting shaft body 1 along the axial direction. Then, slide the second fork arm 4 and the second washer 6, which are assembled together, along the axial direction of the connecting shaft body 1. Then, bolt through the third connecting hole provided in the shaft stop 7 and the corresponding internal threaded hole in the connecting shaft body 1 to secure the shaft stop 7 to the connecting shaft body 1. In this embodiment, the shaft stop 7 is provided with two third connecting holes. When securing the shaft stop 7, you can also use a spring-flattening combination washer or neutral thread glue to prevent the bolts connecting the shaft stop 7 from loosening.

[0030] In summary, the scissor fork assembly of the present invention greatly improves the assembly tolerance when installing the connecting shaft body and the connecting shaft fixing plate by disposing the connecting shaft body and the connecting shaft fixing plate separately, so that the two are connected to the first fork arm in sequence, and reduces the difficulty of positioning the connecting shaft body, the connecting shaft fixing plate and the scissor fork arm during assembly. The present invention also reduces the wear caused by the relative rotation of the scissor fork assembly during operation by providing wear-resistant devices between the first fork arm and the second fork arm, and between the second fork arm and the connecting shaft body. In addition, during later maintenance, the connecting shaft fixing plate can be removed separately and the connecting shaft fixing plate or other parts can be replaced or repaired, making the later maintenance of the scissor fork assembly extremely convenient and low-cost.

[0031] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A scissors fork assembly, characterized by: The invention comprises a connecting shaft body (1), a connecting shaft fixing plate (2), a first fork arm (3) and a second fork arm (4); the connecting shaft body (1) is fixedly connected to the first fork arm (3); the connecting shaft fixing plate (2) is arranged at one axial end of the connecting shaft body (1) and is detachably connected to at least one of the connecting shaft body (1) and the first fork arm (3); and the second fork arm (4) is rotatably connected to the connecting shaft body (1).

2. The scissors fork assembly according to claim 1, characterized in that: It also includes a wear-resistant device, which is used to reduce the wear caused by the relative rotation between the first fork arm (3) and the second fork arm (4) and / or the wear caused by the relative rotation between the second fork arm (4) and the connecting shaft body (1).

3. The scissors fork assembly according to claim 2, characterized in that: The wear-resistant device comprises a first washer (5), which is sleeved on the connecting shaft body (1) and clamped between the first fork arm (3) and the second fork arm (4) in the axial direction of the connecting shaft body (1).

4. The scissors fork assembly according to claim 3, characterized in that: A first through hole is provided on the first fork arm (3), the connecting shaft body (1) is passed through the first through hole, and the first fork arm (3) is fixedly connected to the connecting shaft body (1) as a whole through an interference fit between the first through hole and the connecting shaft body (1).

5. The scissors fork assembly according to claim 2, characterized in that: The wear-resistant device comprises a second washer (6), which is arranged on the second fork arm (4) and is rotatably connected to the connecting shaft body (1), and the second washer (6) is clamped between the connecting shaft body (1) and the second fork arm (4) along the radial direction of the connecting shaft body (1).

6. The scissors fork assembly according to claim 5, characterized in that: A second through hole is provided on the second fork arm (4), the connecting shaft body (1) is passed through the second through hole, the second washer (6) is clamped between the inner surface of the second through hole and the outer surface of the connecting shaft body (1), and is fixedly connected to the second fork arm (4) by interference fit.

7. The scissors fork assembly according to claim 1, characterized in that: The connecting shaft assembly further comprises a shaft stopper (7), which is detachably arranged at the other end of the connecting shaft body (1) opposite to the connecting shaft fixing plate (2) in the axial direction, and the shaft stopper (7) is used to limit the second fork arm (4) along the axial direction of the connecting shaft body (1) to prevent the second fork arm (4) from falling off from the connecting shaft body (1).

8. The scissors fork assembly according to claim 1, characterized in that: The connecting shaft body (1) includes a first positioning portion, which is recessed at one end of the connecting shaft body (1) close to the connecting shaft fixing plate (2). The first positioning portion is used to cooperate with the second positioning portion (2a) on the connecting shaft fixing plate (2) to position the relative positions of the connecting shaft body (1) and the connecting shaft fixing plate (2).

9. The scissors fork assembly according to claim 1, characterized in that: A plurality of first connection holes (21) are provided in the circumference of the connecting shaft fixing plate (2), and the connecting shaft fixing plate (2) is connected to the first fork arm (3) through the first connection holes (21).

10. The scissors fork assembly according to claim 1, characterized in that: A second connecting hole (22) is provided in the middle of the connecting shaft fixing plate (2), and the connecting shaft fixing plate (2) is connected to the connecting shaft body (1) via the second connecting hole (22).

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