CN204828335U - A New Expansion Pin and Its Removal Tool - Google Patents

Abstract

The utility model discloses a novel round pin expands and extracting tool thereof, which comprises an outer shell, locking screw, the cushion, go up the taper block and taper block down, the hole of shell includes the circular cone that two sections tip link to each other, be provided with the screw hole that corresponds with locking screw in the taper block down, go up the taper block and lie in the head end and the tail end of shell hole respectively with taper block down and with this circular cone cooperation, the cushion sets up the outside at last taper block, locking screw's tail end is connected with taper block down, locking screw's head end is passed the taper block and is set up at the round pin outside that expands with the cushion setting to it is fixed with the cushion through lock nut. The utility model discloses a locking screw that the round pin central point put expands, go up the taper block and the cooperation between the taper block down makes the round pin structure that expands under initial condition and between the cotter hole for clearance fit, screws up the back, becomes interference fit by clearance fit between round pin and the cotter hole that expands, seamless connection between the part that can comparatively convenient realization required connection for two can be carried out reliably, accurately, effectively transmit the motion by between the connecting piece.

Description

A New Expansion Pin and Its Removal Tool

technical field

The utility model relates to an expansion pin, in particular to a novel expansion pin capable of realizing seamless connection between two transmission parts and a dismantling tool thereof.

Background technique

At present, commonly used connection structures to realize force transmission between two parts include bolt connection, interference connection and pin connection, etc. For the bolted connection, the assembly and disassembly are cumbersome, and the size of the transmitted torque is relatively limited; for the interference connection, it can bear a large load, but the connection structure has the problem of cumbersome assembly and disassembly, which greatly reduces the For ordinary pin connections, when transmitting shear force, there is usually a gap between the pin and the hole, so the transmission motion is not stable and accurate, and there may be impact during reciprocating motion.

Utility model content

The purpose of this utility model is to provide a new type of expansion pin and its removal tool which can be switched between clearance fit and interference fit in order to solve the above problems.

The utility model realizes above-mentioned purpose through following technical scheme:

A new type of expansion pin, including a shell, a locking screw, a spacer, an upper cone and a lower cone, the inner hole of the shell includes two sections of conical holes connected by small ends, and the two ends of the locking screw are provided with outer The middle part of the locking screw is provided with a stepped structure, the lower cone block is provided with a threaded hole corresponding to the locking screw, and the upper cone block and the lower cone block are respectively located in the shell The head end and tail end of the hole are matched with the conical hole, the spacer is arranged on the outside of the upper cone block, the tail end of the locking screw is connected with the lower cone block, and the locking screw The through hole through which the head end passes through the upper cone block and the spacer is arranged outside the expansion pin, and is fixed with the spacer by a lock nut.

Further, the expansion pin also includes a first circlip and a second circlip, and the upper cone block is fixed at the head end of the inner hole of the housing through the first circlip and axially limited, The lower cone block is fixed on the tail end of the inner hole of the housing through the second elastic retaining ring and axially limited.

Preferably, the locking nut has a double-nut structure, so that the functions of applying pretightening force and loosening can be realized simultaneously.

Specifically, the diameter of the middle part of the inner hole of the housing is smaller than the diameters of both ends thereof.

Specifically, the diameters of the through holes on the upper cone block and the spacer block are larger than the diameter of the locking screw.

That is, no internal thread is provided in the through holes of the upper cone block and the spacer block.

In order to facilitate the disassembly of the above-mentioned new type of expansion pin, the utility model provides a new type of disassembly tool for the expansion pin, including an ejection tool and an inner hexagonal screw, the ejection tool and the first end surface of the shell of the new type of expansion pin In contact, the hexagon socket head screw passes through the through hole on the ejection tool and is connected with the upper taper block of the new type of expansion pin.

The beneficial effects of the utility model are:

The utility model's new expansion pin and its dismantling tool make the expansion pin structure in the initial state and the pin hole be a clearance fit through the cooperation between the locking screw at the center of the expansion pin, the upper cone block and the lower cone block, After tightening, the gap fit between the expansion pin and the pin hole becomes an interference fit, which can more conveniently realize the seamless connection between the parts to be connected, so that the two connected parts can be reliably, accurately and accurately Effectively transmit movement.

Description of drawings

Fig. 1 is the front view of a kind of novel expansion pin described in the utility model;

Fig. 2 is a front view of a removal tool for a new expansion pin described in the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figure 1, the utility model is a new type of expansion pin, including a shell 6, a locking screw 1, a spacer 3, an upper cone 5, a lower cone 7, a first circlip 4 and a second circlip 8. The inner hole of the shell 6 includes two conical holes connected by small ends. The diameter of the middle part of the inner hole of the shell 6 is smaller than the diameter of both ends. Both ends of the locking screw 1 are provided with external threads, and the middle of the locking screw 1 is provided with a step. structure, the lower cone block 7 is provided with a threaded hole corresponding to the locking screw 1, the upper cone block 5 is fixed on the head end of the inner hole of the shell 6 through the first circlip 4 and axially limited, and the lower cone block 7 The second circlip 8 is fixed on the tail end of the inner hole of the shell 6 and axially limited, the spacer 3 is arranged on the outside of the upper cone block 5, the tail end of the locking screw 1 is connected with the lower cone block 7, and the locking The head end of the tightening screw 1 passes through the through hole of the upper cone block 5 and the spacer 3 and is arranged on the outside of the expansion pin, and is fixed with the spacer 3 by the lock nut 2. The through hole on the upper cone 5 and the spacer 3 The diameter is greater than that of the locking screw 1, and the locking nut 2 is a double nut structure.

As shown in Figure 2, a new type of expansion pin removal tool includes a ejection tool 9 and a hexagon socket head cap screw 10, the ejection tool 9 is in contact with the head end face of the shell 6 of a new type of expansion pin, and the hexagon socket head cap screw 10 is worn through The through hole on the ejection tool 9 is connected with the upper cone block 5 of a new type of expansion pin.

The working principle of a new type of expansion pin and its dismounting tool of the utility model is as follows:

When connection is required, insert the expansion pin into the expansion pin hole, then tighten the locking nut clockwise, and apply a pre-tightening force between the upper cone block 5 and the lower cone block 7, so that the upper cone block 5 and the lower cone block 7 Both move toward the middle end of the inner hole of the shell 6, so that the shell 6 elastically expands outward, and the clearance fit between the expansion pin and the pin hole becomes an interference fit, so as to realize the precise transmission between the two connected parts.

When it needs to be disassembled, loosen and withdraw the lock nut 2, and rotate the lock screw 1 counterclockwise. Apply the force in the opposite direction to make the upper cone block 5 and the lower cone block 7 move to the two ends of the inner hole of the shell 6, so that the upper cone block 5, the lower cone block 7 and the shell 6 are separated, so that the shell 6 The elastic expansion returns to the original state, so that the interference fit between the expansion pin and the pin hole becomes a clearance fit, so as to realize the disassembly of the expansion pin.

In addition, if the lower cone block 7 is not separated from the shell 6, first take out the pad 3, the first circlip 4 and the upper cone block 5 in sequence, and knock the lower cone block 7 in the axial direction, then the lower cone can be made Block 7 is detached from housing 6 .

If the upper cone block 5 is not detached from the shell 6, you need to use the removal tool of the expansion pin, the principle is as follows:

Take out the lock nut 2, the spacer 3 and the first circlip 4 in sequence, and install the ejection tool 9 on the head end of the shell 6 through the hexagon socket head screw 10, and turn the hexagon socket head screw 10 clockwise to place the upper cone 5 is disengaged from the shell 6, so that the expansion pin can be taken out smoothly.

The technical solution of the utility model is not limited to the limitations of the above-mentioned specific embodiments, and any technical deformation made according to the technical solution of the utility model falls within the protection scope of the utility model.

Claims (6)

1. A new type of expansion pin, characterized in that: it includes a housing, a locking screw, a spacer, an upper cone and a lower cone, the inner hole of the housing includes two conical holes connected by small ends, and the locking screw Both ends are provided with external threads, the middle part of the locking screw is provided with a stepped structure, the lower cone block is provided with a threaded hole corresponding to the locking screw, the upper cone block and the lower cone block They are respectively located at the head end and the tail end of the inner hole of the housing and cooperate with the conical hole, the spacer is arranged on the outside of the upper cone block, the tail end of the locking screw is connected with the lower cone block, The head end of the locking screw passes through the through hole of the upper cone block and the spacer and is arranged on the outside of the expansion pin, and is fixed with the spacer by a lock nut. 2. A new type of expansion pin according to claim 1, characterized in that: it also includes a first circlip and a second circlip, and the upper cone is fixed on the said first circlip by the first circlip. The head end of the inner hole of the shell is axially limited, and the lower cone block is fixed on the tail end of the inner hole of the shell through the second elastic circlip and axially limited. 3. A new type of expansion pin according to claim 1, characterized in that: the locking nut is a double-nut structure. 4. A new type of expansion pin according to claim 1, characterized in that: the diameter of the middle part of the inner hole of the housing is smaller than the diameters of both ends. 5. A new type of expansion pin according to claim 1, characterized in that: the diameter of the through hole on the upper cone block and the spacer block is larger than the diameter of the locking screw. 6. A dismantling tool for a novel expansion pin, characterized in that: it comprises an ejection tool and a hexagon socket head cap screw, and the ejection tool is in contact with the head end face of the shell of the novel expansion pin according to claim 1, so that The hexagon socket head cap screw passes through the through hole on the ejection tool and is connected with the shell of the novel expansion pin described in claim 1.