High-adaptation precision telescopic universal pin shaft

Abstract

The utility model relates to a telescopic universal pin shaft with high adaptation precision, which comprises a central rod and three inner support components uniformly distributed on the outer side of the central rod around the shaft, each inner support component comprises a fixed block, an upper connecting rod, a lower connecting rod and a movable block which are mutually hinged, the fixed blocks are connected to the central rod, the inner ends of the upper connecting rods and the upper ends of the fixed blocks are hinged to a first rotating shaft, and the lower ends of the lower connecting rods are hinged to a second rotating shaft. The outer end of the upper connecting rod and the upper end of the movable block are hinged to a second rotating shaft, the inner end of the lower connecting rod and the lower portion of the fixed block are hinged to a third rotating shaft, and the outer end of the lower connecting rod and the middle of the movable block are hinged to a fourth rotating shaft. The axis of the first rotating shaft, the axis of the second rotating shaft, the axis of the third rotating shaft and the axis of the fourth rotating shaft form the position relation of four corner points of a parallelogram, the movable block is provided with inner supporting faces, and the distances from the three inner supporting faces to the axis of the center rod are kept equal. According to the universal pin shaft, the radial distance from the inner supporting surface to the axis can be flexibly changed within a certain range, so that the universal pin shaft can be suitable for through holes with various calibers.

Description

Technical Field

[0001] The utility model relates to the technical field of welding positioning clamps, in particular to a highly adaptable precision telescopic universal pin. Background Art

[0002] The boom or dipper arm on the excavator is the moving part of the digging arm. In order to realize the digging action of the digging arm, there are many rotating joints on the boom and dipper arm, and the rotating joints use pins as connecting parts. These pins will pass through the pre-set fin plates on the boom or dipper arm, and many fin plates are set in pairs. The pins must pass through the through holes of equal size on different fin plates, so there is a coaxiality requirement between the through holes. Therefore, during the welding process, it is generally necessary to use a positioning pin to locate the coaxiality of the through holes of the fin plates. However, different types of digging arms have different diameters of through holes on the fin plates. A positioning pin is often only suitable for positioning fin plates of a specific diameter. In this way, a positioning pin must be designed to design a welding tool, which is not flexible to use.

[0003] Chinese patent CN217965514U discloses a support mechanism for the inner ring, which has a multi-link structure and can open the crossbar by operating the power mechanism, so that it can be used for positioning the inner ring of the steel cage. However, the inner diameter of the inner ring in this use case is very large, and the support mechanism can be fully extended into the middle of the inner ring to complete the center positioning. However, the diameter of the through hole is generally not that large, so this structure cannot be directly used for the coaxial alignment of the through hole.

[0004] Therefore, it is necessary to develop a new positioning pin structure to solve the above problems. Summary of the invention

[0005] The main purpose of the utility model is to provide a highly adaptable and precise telescopic universal pin which can be suitable for through holes of various calibers.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions: a highly adaptable and precise telescopic universal pin, comprising a center rod and three inner support components evenly distributed around the axis on the outer side of the center rod, the inner support component comprising a fixed block, an upper connecting rod, a lower connecting rod and a movable block hinged to each other, the fixed block is connected to the center rod, the inner end of the upper connecting rod and the upper end of the fixed block are hinged to a first rotating shaft, the outer end of the upper connecting rod and the upper end of the movable block are hinged to a second rotating shaft, the inner end of the lower connecting rod and the lower part of the fixed block are hinged to the third rotating shaft, and the outer end of the lower connecting rod is hinged to the middle part of the movable block. On the fourth rotating shaft, the axes of the first rotating shaft, the second rotating shaft, the third rotating shaft and the fourth rotating shaft form a positional relationship of the four corner points of a parallelogram; the movable block is divided into a hinge part, a support part and a support part, the inner end of the support part is connected to the upper end of the support part, the inner end of the support part is connected to the lower end of the hinge part, the upper connecting rod and the lower connecting rod are both hinged on the hinge part, the lower part of the supporting part is a horizontal supporting surface, the outer side of the support part is provided with an inner supporting surface facing away from the axis of the center rod, and the distances from the three inner supporting surfaces to the axis of the center rod are kept equal.

[0007] Specifically, the prism portion is a prism portion of a triangular prism-like structure, including three fixing surfaces at an angle of 60° to each other, the surface of the fixing block in contact with the fixing surface is a plane, and the fixing block is fixed to the fixing surface by two bolts.

[0008] Specifically, the upper portion of the central rod is a handle, and the outer diameter of the handle is greater than the outer diameter of the prism portion.

[0009] Specifically, a hand guard is provided between the handle and the prism portion, and an outer diameter of the hand guard is greater than an outer diameter of the handle.

[0010] The beneficial effects of the technical solution of the utility model are:

[0011] The utility model can utilize three inner support surfaces to coaxially position each through hole of two welded parts, thereby positioning the two parts for relative position. The distance from the inner support surface to the axis can be flexibly changed, so the universal pin shaft can be suitable for through holes of various calibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A three-dimensional diagram of a high-adaptability precision telescopic universal pin according to an embodiment;

[0013] Figure 2 It is a three-dimensional diagram of another angle of the high-adaptation precision telescopic universal pin of the embodiment;

[0014] Figure 3 A three-dimensional diagram of the center pole;

[0015] Figure 4 This is a diagram of the usage status of the high-adaptability precision telescopic universal pin.

[0016] The numbers in the figure represent:

[0017] 1-Universal pin,

[0018] 11-center rod, 111-prism part, 1111-fixing surface, 112-handle part, 113-hand guard part,

[0019] 12-inner support assembly, 121-fixed block, 122-upper connecting rod, 123-lower connecting rod, 124-movable block, 1241-hinge portion, 1242-support portion, 12421-horizontal support surface, 1243-opening portion, 12431-inner support surface, 125a-first rotating shaft, 125b-second rotating shaft, 125c-third rotating shaft, 125d-fourth rotating shaft; 2-fin plate, 21-through hole. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with specific embodiments.

[0021] Example:

[0022] like Figure 1 , Figure 2 and Figure 4 As shown, a high-adaptability precision telescopic universal pin 1 of the utility model comprises a center rod 11 and three inner support components 12 evenly distributed around the axis on the outer side of the center rod 11, the inner support component 12 comprises a fixed block 121, an upper connecting rod 122, a lower connecting rod 123 and a movable block 124 which are hinged to each other, the fixed block 121 is connected to the center rod 11, the inner end of the upper connecting rod 122 and the upper end of the fixed block 121 are hinged to a first rotating shaft 125a, the outer end of the upper connecting rod 122 and the upper end of the movable block 124 are hinged to a second rotating shaft 125b, the inner end of the lower connecting rod 123 and the lower part of the fixed block 121 are hinged to a third rotating shaft 125c, the outer end of the lower connecting rod 123 and the middle part of the movable block 124 are hinged to a fourth rotating shaft 125d, and the first rotating shaft 12 5a, the axis of the second rotating shaft 125b, the axis of the third rotating shaft 125c and the axis of the fourth rotating shaft 125d form a positional relationship of the four corner points of a parallelogram; the movable block 124 is divided into a hinged portion 1241, a supporting portion 1242 and a spreading portion 1243, the inner end of the supporting portion 1242 is connected to the upper end of the spreading portion 1243, the inner end of the supporting portion 1242 is connected to the lower end of the hinged portion 1241, the upper connecting rod 122 and the lower connecting rod 123 are both hinged on the hinged portion 1241, the lower portion of the supporting portion 1242 is a horizontal supporting surface 12421, and the outer side of the spreading portion 1243 is provided with an inner supporting surface 12431 facing away from the axis of the center rod 11, and the distances between the three inner supporting surfaces 12431 and the axis of the center rod 11 are kept equal.

[0023] The inner support assembly 12 is a parallelogram connecting rod structure, in which the movable block 124 maintains a parallel relationship with the fixed block 121, and can also maintain a parallel relationship with the axis of the center rod 11. When the upper connecting rod 122 and the lower connecting rod 123 swing downward, the movable block 124 moves downward while moving away from the center rod 11. When in use, the operator holds the upper end of the center rod 11, and the movable block 124 naturally droops and is close to the center rod 11; then the three opening parts 1243 are inserted into the through hole 21 of the fin plate 2, so that the three horizontal support surfaces 12421 are all attached to the upper surface of the upper fin plate 2, and the center rod 11 is released. The center rod 11 drops under the action of its own weight, and the three movable blocks 124 will be naturally opened, so that the inner support surface 12431 is all attached to the inner wall of the through hole 21. The length of the opening part 1243 is enough to pass through the through holes 21 of the two fin plates 2, so that the two through holes 21 will be centrally positioned by the universal pin 1. Combined with the angular positioning of other positions of the fin plate 2, the relative position of the two fin plates 2 can be determined, thereby meeting the welding accuracy requirements. The radial distance from the inner support surface 12431 of the universal pin 1 to the axis of the center rod 11 can be flexibly changed within a certain range, and the universal pin 1 can be applied to through holes 21 of various calibers.

[0024] like Figure 3 As shown, the lower part of the center rod 11 is a prism portion 111 of a triangular prism-like structure, including three fixing surfaces 1111 at an angle of 60° to each other, and the surface of the fixing block 121 in contact with the fixing surface 1111 is a plane, and the fixing block 121 is fixed to the fixing surface 1111 by two bolts.

[0025] The structure of the prism portion 111 is relatively stable, so that the three fixing blocks 121 can maintain a central symmetric relationship, thereby enabling the three inner support components 12 to cooperate in coaxial positioning of the through holes 21 of the fin plate 2 .

[0026] like Figure 3 As shown, the upper portion of the central rod 11 is a handle 112 , and the outer diameter of the handle 112 is greater than the outer diameter of the prism portion 111 .

[0027] The universal pin 1 has no power, and the external support force of the internal support assembly 12 depends on the deadweight of the center rod 11, so the operator only needs to put the universal pin 1 into the through hole 21, and the universal pin 1 will automatically complete the center positioning. As a handheld tool, the handle 112 of the universal pin 1 can facilitate the operator to hold the center rod 11 on the one hand, and on the other hand, it can increase the deadweight of the center rod 11 to ensure the coaxial positioning accuracy of the through hole 21. In theory, the heavier the center rod 11, the higher the positioning accuracy, but the more inconvenient it is to carry, so the weight of the center rod 11 can only be appropriately increased by the handle 112, not the heavier the better.

[0028] like Figure 3As shown, a hand guard 113 is provided between the handle 112 and the prism portion 111 , and the outer diameter of the hand guard 113 is greater than the outer diameter of the handle 112 .

[0029] Because the first rotating shaft 13a is close to the handle 112, if there is no hand guard 113, the relative movement between the upper connecting rod 122 and the fixed block 121 is easy to pinch fingers. After the hand guard 113 is provided, on the one hand, the weight of the center rod 11 is appropriately increased, and on the other hand, the holding position and the rotating position are separated, thereby improving the safety of the universal pin 1.

[0030] The above are only some implementations of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A highly adaptable and precise telescopic universal pin, characterized in that: The invention comprises a central rod and three inner support components evenly distributed around the axis on the outer side of the central rod, the inner support component comprises a fixed block, an upper connecting rod, a lower connecting rod and a movable block which are hinged to each other, the fixed block is connected to the central rod, the inner end of the upper connecting rod and the upper end of the fixed block are hinged to the first rotating shaft, the outer end of the upper connecting rod and the upper end of the movable block are hinged to the second rotating shaft, the inner end of the lower connecting rod and the lower part of the fixed block are hinged to the third rotating shaft, the outer end of the lower connecting rod and the middle part of the movable block are hinged to the fourth rotating shaft, the axis of the first rotating shaft, the The axis of the second rotating shaft, the axis of the third rotating shaft and the axis of the fourth rotating shaft form a positional relationship of the four corner points of a parallelogram; the movable block is divided into a hinge part, a support part and a support part, the inner end of the support part is connected to the upper end of the support part, the inner end of the support part is connected to the lower end of the hinge part, the upper connecting rod and the lower connecting rod are both hinged on the hinge part, the lower part of the supporting part is a horizontal supporting surface, the outer side of the support part is provided with an inner supporting surface facing away from the axis of the center rod, and the distances from the three inner supporting surfaces to the axis of the center rod are kept equal.

2. The high-adaptability precision telescopic universal pin according to claim 1, characterized in that: The lower part of the central rod is a prism part of a triangular prism-like structure, including three fixing surfaces at an angle of 60° to each other. The side of the fixing block in contact with the fixing surface is a plane, and the fixing block is fixed to the fixing surface by two bolts.

3. The high-adaptability precision telescopic universal pin according to claim 2, characterized in that: The upper part of the central rod is a handle, and the outer diameter of the handle is greater than the outer diameter of the prism part.

4. The high-adaptability precision telescopic universal pin according to claim 3 is characterized by: A hand guard is provided between the handle and the prism, and the outer diameter of the hand guard is greater than the outer diameter of the handle.

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