Variable-diameter universal pin shaft

Abstract

The utility model relates to the technical field of excavator structural member assembly tools, in particular to a variable-diameter universal pin shaft which comprises a bolt long rod, and a first thread and a second thread which are opposite in screwing direction are arranged on the front portion and the rear portion of the bolt long rod respectively. The first thread and the second thread are sleeved with a first nut block and a second nut block which are matched with each other respectively, a plurality of arc-shaped plates are arranged outside the bolt long rod and evenly distributed along the circumference of the bolt long rod, and the outer side wall of the first nut block is hinged to the front portions of the arc-shaped plates through first connecting rods. The outer side wall of the second nut block is hinged to the rear of the arc-shaped plate through second connecting rods. The device can adapt to parts with different hole diameters by adjusting the radial size of the pin shaft, the pin shaft does not need to be frequently replaced, the use convenience and the working efficiency are improved, meanwhile, particularly accurate adjustment is not needed during installation, and the parts can be rapidly installed and fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of excavator structural component assembly tooling, in particular to a universal pin shaft with a variable diameter. Background Art

[0002] During the welding process of excavator structural parts, the pin is a commonly used hinge point positioning tool. Operators need to use different pin diameters according to different hole diameters. Each hole diameter requires a pin of a certain specification, which cannot be universal. At present, ordinary pins can only be used for a single hole diameter. When parts with different hole diameters need to be connected, pins of different diameters need to be replaced, which requires a large number of pins and increases costs. In addition, the existing pin structure is simple, the matching accuracy of the shaft and the hole is high, the shaft-hole matching clearance is small, and the installation is difficult, which reduces production efficiency.

[0003] Based on the above problems, the utility model provides a universal pin with variable diameter. This structure can adapt to components with different apertures by adjusting the radial dimensions of the pin. There is no need to frequently replace the pin, thereby improving the convenience of use and work efficiency. At the same time, no particularly precise adjustment is required during installation, and the components can be quickly installed and fixed. Summary of the invention

[0004] The technical problem to be solved by the utility model is to design a universal pin with a variable diameter, which can adapt to components with different apertures by adjusting the radial dimensions, without the need for frequent replacement of the pin and without the need for particularly precise adjustment during installation, and can quickly install and fix the components.

[0005] In order to solve the above technical problems, the variable diameter universal pin shaft of the utility model includes a bolt long rod, and the front and rear parts of the bolt long rod are respectively provided with a first thread and a second thread with opposite rotation directions, and the first thread and the second thread are respectively provided with a first nut block and a second nut block that are matched, and a plurality of arc plates are arranged outside the bolt long rod, and the plurality of arc plates are evenly distributed along the circumference of the bolt long rod, the outer wall of the first nut block is hinged to the front part of the arc plate through a first connecting rod, and the outer wall of the second nut block is hinged to the rear part of the arc plate through a second connecting rod.

[0006] By adopting the above structure, the threads on both sides of the bolt long rod are in opposite directions, ensuring that the two nut blocks can move toward or away from each other on the bolt long rod; the two nut blocks move toward or away from each other on the bolt long rod, driving the two connecting rods hinged to the two nut blocks to move in the vertical direction, thereby changing the radial size of the pin shaft.

[0007] Preferably, there are four arc-shaped plates, and there are four first connecting rods and four second connecting rods, respectively. The four arc-shaped plates and the four connecting rods make the overall structure more stable.

[0008] Preferably, the first nut block and the second nut block are respectively arranged to be cuboids, and one end of four first connecting rods are respectively hinged on the four outer side walls of the first nut block, and the other ends of the four first connecting rods are respectively hinged to the front parts of the inner side walls of the four arc-shaped plates; one end of four second connecting rods are respectively hinged on the four outer side walls of the second nut block, and the other ends of the four second connecting rods are respectively hinged to the rear parts of the inner side walls of the four arc-shaped plates.

[0009] Preferably, the four arc-shaped plates have the same structure.

[0010] Preferably, the four arc-shaped plates have the same radius. The four arc-shaped plates have the same structure and radius and can move outwards synchronously.

[0011] Preferably, two bearings matching the two ends of the bolt rod are respectively mounted, and the first thread and the second thread are both located between the two bearings. The bolt rod is locked with the inner diameter of the bearing, and the bolt rod rotates by rotating the thread.

[0012] Preferably, the bolt rod is covered with a mounting sleeve, the outer rings of the two bearings are connected to the mounting sleeve, the mounting sleeve is provided with four long slots along its circumference, and the first connecting rod and the second connecting rod can extend out of the long slots one by one. The setting of the mounting sleeve can play a protective role when the nut block moves.

[0013] Preferably, the inner side walls of the four arc-shaped plates are all installed with two connecting plates arranged along the length direction thereof, the front end and the rear end of the two connecting plates are respectively hinged to the first connecting rod and the second connecting rod, and the length of the two connecting plates is less than the longest distance from the first thread to the second thread. The arrangement of the connecting plates makes the connection between the first connecting rod and the second connecting rod and the arc-shaped plate more stable.

[0014] Preferably, a non-threaded area is provided between the rear end of the first thread and the front end of the second thread, and the provision of the non-threaded area can prevent the first nut block and the second nut block from colliding during movement.

[0015] In summary, the beneficial effects of the present invention are:

[0016] (1) By adjusting the radial size of the pin to adapt to components with different apertures, there is no need to frequently replace the pin, which improves convenience and work efficiency;

[0017] (2) Since the variable diameter pin shaft has the ability to adjust the diameter, there is no need for particularly precise adjustment during installation, and the components can be installed and fixed quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1This is a schematic diagram of the exploded structure of a universal pin shaft with a variable diameter according to the utility model;

[0020] Figure 2 This is a schematic diagram of the main structure of a universal pin shaft with a variable diameter according to the utility model;

[0021] Figure 3 for Figure 2 Schematic diagram of the AA cross-sectional structure.

[0022] In the figure: a bolt long rod 1, a first thread 2, a second thread 3, a first nut block 4, a second nut block 5, an arc plate 7, a first connecting rod 8, a second connecting rod 9, a bearing 10, a mounting sleeve 11, a long groove 12, and a connecting plate 13. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 a limitation on the present application.

[0025] The terms "first", "second", etc. 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. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0028] See attached Figure 1-3The utility model discloses a universal variable diameter pin shaft, the overall structure of which includes a bolt rod 1, a first thread 2 and a second thread 3 with opposite rotation directions are respectively arranged at the front and rear parts of the bolt rod 1, a thread-free area is arranged between the rear end of the first thread 2 and the front end of the second thread 3, the first thread 2 and the second thread 3 are respectively provided with a first nut block 4 and a second nut block 5 which are matched, a plurality of arc plates 7 with the same structure are arranged outside the bolt rod 1, and the plurality of arc plates 7 are evenly distributed along the circumference of the bolt rod 1, the outer side wall of the first nut block 4 is hinged to the front part of the arc plate 7 through a first connecting rod 8, and the outer side wall of the second nut block 5 is hinged to the rear part of the arc plate 7 through a second connecting rod 9.

[0029] As a further explanation of this embodiment, refer to the attached Figure 1-3 There are four arc-shaped plates 7, four first connecting rods 8 and four second connecting rods 9 are also provided respectively, the first nut block 4 and the second nut block 5 are also correspondingly arranged into a cuboid, four first connecting rods 8 are hinged on the four outer side walls of the first nut block 4, and the other ends of the four first connecting rods 8 are hinged to the front parts of the inner side walls of the four arc-shaped plates 7 respectively, four second connecting rods 9 are hinged on the four outer side walls of the second nut block 5, and the other ends of the four second connecting rods 9 are hinged to the rear parts of the inner side walls of the four arc-shaped plates 7 respectively, and the four outer side walls of the first nut block 4 and the second nut block 5 all refer to the four outer side walls without threaded holes.

[0030] As a further explanation of this embodiment, refer to the attached Figure 1-3 , the four arc-shaped plates 7 have the same radius.

[0031] As a further explanation of this embodiment, refer to the attached Figure 1-3 Two bearings 10 matching with the bolt rod 1 are respectively installed at both ends, and the first thread 2 and the second thread 3 are both located between the two bearings 10.

[0032] As a further explanation of this embodiment, refer to the attached Figure 1-3 The bolt long rod 1 is sleeved with a mounting sleeve 11, the outer rings of the two bearings 10 are connected to the mounting sleeve 11, and the mounting sleeve 11 is provided with four long slots 12 along its circumference. The first connecting rod 8 and the second connecting rod 9 can extend out of the long slots 12 one by one. The first connecting rod 8 and the second connecting rod 9 are grouped in pairs, and each group passes through a long slot 12 respectively.

[0033] As a further explanation of this embodiment, refer to the attached Figure 1-3 The inner side walls of the four arc-shaped plates 7 are all installed with two connecting plates 13 arranged along the length direction thereof. The front and rear ends of the two connecting plates 13 are respectively hinged to the first connecting rod 8 and the second connecting rod 9. The lengths of the two connecting plates 13 are both smaller than the longest distance from the first thread 2 to the second thread 3. The first connecting rod 8 and the second connecting rod 9 are both connected to the arc-shaped plates 7 through the two connecting plates 13.

[0034] Working principle of the utility model: during use, the bearing 10 is installed into the bolt rod 1, the inner diameter of the bearing 10 is locked with the outer diameter of the bolt rod 1, and at the same time, one end of the four first connecting rods 8 is respectively hinged with the four outer side surfaces of the first nut block 4, and then the first nut block 4 is installed into the first thread 2 on the bolt rod 1, and one end of the four second connecting rods 9 is respectively hinged with the four outer side surfaces of the second nut block 5, and then the second nut block 5 is installed into the second thread 3 on the bolt rod 1, ensuring that the first nut block 4 and the second nut block 5 remain symmetrical based on the bolt rod 1. The other ends of the four first connecting rods 8 are hinged with the front of the four arc plates 7, and the other ends of the four second connecting rods 9 are hinged with the rear of the four arc plates 7. Finally, the installation sleeve 11 is installed, and the inner diameter of the installation sleeve 11 is interference fit with the outer diameter of the bearing 10, ensuring that the front and rear end bearings 2 are clamped and locked with the installation sleeve 11.

[0035] When the bolt rod 1 is rotated clockwise or counterclockwise, the inner diameter of the bearing 10 is locked with the bolt rod 1, and the bolt rod 1 rotates idly; the first nut block 4 rotates in the same direction as the bolt rod 1, but the gap between the first connecting rod 8 connected to the first nut block 4 and the mounting sleeve 11 has a reverse rotation resistance, preventing the first nut block 4 from rotating. Under the action of the reverse rotation force, and at the same time, the first nut block 4 and the bolt rod 1 are matched with each other in the internal and external thread structure, the bolt rod 1 drives the first nut block 4 to realize linear movement. By rotating the bolt rod 1 clockwise or counterclockwise, the first nut block 4 can be moved forward and backward, and the same is true for the other side. The front and rear sides of the bolt rod 1 adopt a reverse thread structure, so that the thread blocks on both sides can move inward and outward at the same time, driving the first connecting rod 8 and the second connecting rod 9 to push the arc plate 7 to move in the vertical direction, thereby changing the diameter of the pin shaft.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A universal pin with a variable diameter, characterized in that The invention comprises a bolt rod (1), wherein the front and rear parts of the bolt rod (1) are respectively provided with a first thread (2) and a second thread (3) having opposite rotation directions, and the first thread (2) and the second thread (3) are respectively provided with a first nut block (4) and a second nut block (5) which are matched with each other, and the bolt rod (1) is provided with a plurality of arc plates (7) on the outside, and the plurality of arc plates (7) are evenly distributed along the circumference of the bolt rod (1), and the outer wall of the first nut block (4) is hinged to the front part of the arc plate (7) through a first connecting rod (8), and the outer wall of the second nut block (5) is hinged to the rear part of the arc plate (7) through a second connecting rod (9).

2. The variable diameter universal pin according to claim 1, characterized in that Four arc-shaped plates (7) are provided, and four first connecting rods (8) and four second connecting rods (9) are also provided accordingly.

3. The variable diameter universal pin according to claim 2, characterized in that The first nut block (4) and the second nut block (5) are respectively arranged in the form of a cuboid; one end of four first connecting rods (8) are respectively hinged to the four outer side walls of the first nut block (4); the other ends of the four first connecting rods (8) are respectively hinged to the front parts of the inner side walls of the four arc-shaped plates (7); one end of four second connecting rods (9) are respectively hinged to the four outer side walls of the second nut block (5); the other ends of the four second connecting rods (9) are respectively hinged to the rear parts of the inner side walls of the four arc-shaped plates (7).

4. The variable diameter universal pin according to claim 3, characterized in that The four arc-shaped plates (7) have the same structure.

5. The variable diameter universal pin according to claim 4, characterized in that The four arc-shaped plates (7) have the same radius.

6. The variable diameter universal pin according to claim 5, characterized in that Two bearings (10) matching the two ends of the bolt rod (1) are respectively mounted thereon, and the first thread (2) and the second thread (3) are both located between the two bearings (10).

7. The variable diameter universal pin according to claim 6, characterized in that The bolt rod (1) is sleeved with a mounting sleeve (11), the outer rings of the two bearings (10) are connected to the mounting sleeve (11), the mounting sleeve (11) is provided with four long slots (12) along its circumference, and the first connecting rod (8) and the second connecting rod (9) can both extend out of the long slots (12) in a one-to-one correspondence.

8. The variable diameter universal pin according to claim 7, characterized in that The inner side walls of the four arc-shaped plates (7) are all provided with two connecting plates (13) arranged along the length direction thereof, the front and rear ends of the two connecting plates (13) are respectively hinged to the first connecting rod (8) and the second connecting rod (9), and the lengths of the two connecting plates (13) are both less than the longest distance from the first thread (2) to the second thread (3).

9. The variable diameter universal pin according to claim 8, characterized in that A non-threaded area is provided between the rear end of the first thread (2) and the front end of the second thread (3).

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