CN202781015U - Tool special for removing pins - Google Patents

Abstract

The utility model discloses a special tool for unloading pins, which comprises a connecting rod, a positioning screw coaxially arranged at one end of the connecting rod, and a hammer slidingly matched with the connecting rod. ; The set screw is threadedly connected with the connecting rod. The special tool for unloading pins of the utility model has a simple overall structure and is convenient to use. The adoption of the thread structure facilitates the replacement of positioning screws, which improves the versatility of the special tool, and the overall size of the tool is small and can be used in certain places with narrow spaces. The utility model has the advantages of low production cost, convenient maintenance and long service life.

Description

A special tool for unloading pins

technical field

The utility model relates to a mechanical disassembly tool, in particular to a special tool for unloading pins.

Background technique

The pin is mainly used to fix the relative position between two assemblies, or realize the connection between the assemblies, etc. Generally, it is an interference fit with the assembly, and it is difficult to come out after the pin is tightened. In order to facilitate disassembly, the upper end of the general pin is provided with a threaded groove with an internal thread. Usually, when assembling or maintaining the mold, the pins are generally thrown out with a hammer, or pulled out with a simple pin puller welded by a self-made screw. Because the screw type is too small, the welding surface is difficult to weld firmly. In the process of daily mold maintenance, screws are often broken, which seriously affects the efficiency of mold assembly and maintenance. When repairing the molds that are being used in production on site, once the problem of breaking the screws occurs, the employees must remove all the molds from the equipment, which is time-consuming and laborious, which seriously affects the work efficiency of the employees.

In order to solve the technical problem that the existing pin removal tool is easy to damage the screw and the pin when the pin is disassembled, the patent document with the publication number CN201325031 discloses a pin removal tool, which includes a wrench, a nail remover and a support member, wherein the nail remover includes a The head of the nail piece and the stem of the nail remover. The wrench is an inner hexagon wrench or an outer hexagon wrench. The head of the nail remover is an inner hexagon head or an outer hexagon head that can be matched with the wrench. Cylindrical rod, the peripheral surface of the lower end is provided with an external thread that can cooperate with the internal thread of the pin. The support includes a support through hole and a support pit that communicate up and down. The diameter of the support through hole is smaller than the diameter of the nail head. Small, larger than the diameter of the shank of the nail, and the inner diameter of the support pocket is larger than the diameter of the head of the pin. The pin pulling tool solves the technical problems that the assembly and the pin are easily damaged when the existing pin pulling tool removes the pin, and it is not conducive to the repeated installation of the assembly. Easy to operate.

However, the pin pulling tool disclosed in the above-mentioned patent documents has the following defects: (1) the nail remover cannot be replaced, and can only be used for dismounting pins of one type and depth, which is poor in practicability. (2) In addition, when the nail remover is damaged, it needs to be replaced as a whole, which increases the cost of use.

Utility model content

The utility model provides a special tool for unloading pins. The tool is low in production cost and easy to use. The positioning screws are detachably connected, so that it is convenient to select a suitable positioning screw according to different specifications of the pins, and at the same time it is convenient to replace damaged positioning screws, which improves the The service life of special tools for unloading pins.

A special tool for unloading pins, comprising a connecting rod, a positioning screw coaxially arranged at one end of the connecting rod, and a hammer that slides and fits with the connecting rod, and the connecting rod is provided with a hammer limiter; the positioning The screw is threadedly connected with the connecting rod.

The positioning screw is selected to be threadedly connected with the connecting rod, which facilitates the replacement of the positioning screw, and the appropriate positioning screw can be selected according to the size of the pin to be disassembled in practice, which improves the versatility of the special tool for unloading the pin of the present utility model, and reduces the The cost.

A variety of ways can be selected to thread the positioning screw and the connecting rod. For the convenience of processing, a preferred technical solution is: one end of the connecting rod is threaded with a connecting cap, and the end surface of the connecting cap is provided with a through hole. The screw part of the positioning screw passes through the through hole, and the nut part of the positioning screw is limited between the connecting rod and the connecting cap. The connection cap is generally processed together with the positioning screw, and it is replaced in a complete set to ensure the stability of the positioning screw during use.

In order to improve the service life of the hammer and ensure that the hammer has a strong impact force during use, the hammer is a metal sleeve, and the inner wall of the end of the metal sleeve close to the positioning screw is provided with a stopper for the hammer. Fitting limit ring. The limit ring can be set separately, and can also be integrally processed and formed with the metal sleeve.

The hammer limiter is used to limit the two limit positions of the hammer slide. For the convenience of processing, the preferred hammer limiter includes a limiter fixed on the end of the connecting rod facing away from the positioning screw and a limit post arranged on the connecting rod. The limiting boss in the middle, the limiting ring is located between the limiting post and the limiting boss. Under the combined action of the limiting post and the limiting boss, the limiting ring slides reciprocally on the connecting rod between the limiting post and the limiting boss, thereby controlling the sliding distance of the punch. The limiting boss and the connecting rod can be arranged integrally, or the prefabricated limiting boss can be fixedly connected to the rod body of the connecting rod. The spacer column and the connecting rod can be arranged integrally, or the spacer column can be prefabricated, and then fixed with the corresponding end of the link bar. In order to facilitate the replacement and disassembly of the hammer, the limiting column is threadedly connected with the connecting rod. When threaded connection is selected, a threaded hole can be set in the center of the limiting post, a threaded groove can be set at the corresponding end of the connecting rod, and the two can be fixed by bolts. In order to further reduce the wear of the ram to the limiting boss under the effect of ensuring a relatively large impact force, the outer diameter of the end of the limiting bulge close to the ram can be selected to be larger than the outer diameter of the other end.

In order to prevent the positioning screw from shaking left and right during the disassembly process, the vertical gap between the inner wall of the metal sleeve and the limiting column and the vertical gap between the limiting ring and the connecting rod are 0.5- 1mm. If the gap is too large, the connecting rod is prone to shake during the reciprocating sliding of the hammer, resulting in inaccurate positioning of the positioning screw or twisting of the positioning screw; if the gap is too small, it is easy to cause the hammer and the connecting rod to be stuck firmly, resulting in an unsmooth disassembly process conduct.

A cavity is formed between the limit ring of the ram, the inner wall of the ram, the limit column and the outer wall of the connecting rod. During the impact of the ram, the vertical gap between the limit ring and the connecting rod is as small as 0.5-1mm , During the high-speed collision process, the gas in the cavity is too late to be discharged, which will form a certain resistance to the hammer. In order to avoid the air resistance formed, a preferred technical solution is that the outer wall of the limiting column is provided with an air guide groove. The depth of the air guide groove can be determined according to the size of the actual tool itself.

In order to prevent the hand from slipping during use, the end of the metal sleeve facing away from the positioning screw can be selected to have an outward flange. In order to further increase the friction between the hammer and the hand, an anti-skid protrusion or an anti-skid groove can be optionally provided on the outer wall of the hammer.

The special tool for unloading pins of the utility model has a simple overall structure and is easy to use. The adoption of the thread structure facilitates the replacement of positioning screws, which improves the versatility of the special tool, and the overall size of the tool is small and can be used in certain places with narrow spaces. The utility model has the advantages of low production cost, convenient maintenance and long service life.

Description of drawings

Fig. 1 is a structural schematic diagram of the special tool for unloading pins of the present utility model.

Fig. 2 is a sectional view of the special tool A-A shown in Fig. 1 .

Detailed ways

As shown in Figures 1 and 2, a special tool for unloading pins includes a connecting rod 1, a set screw 2 coaxially arranged at one end of the connecting rod 1, and a punch 3 that slides with the connecting rod 1, and the connecting rod 1 There is a hammer stopper on it.

The connecting rod 1 is a circular steel pipe, one end is provided with an external thread, the other end is provided with a thread groove, and the outer wall of the middle part is provided with a limiting boss 6, and the limiting boss 6 forms a part of the hammer stopper. The size of the diameter of the connecting rod 1 is generally determined according to actual needs. The externally threaded end of the connecting rod 1 is threadedly fitted with a connecting cap 5 . The connecting cap 5 is a cylinder with a thread groove, and the size of the thread groove matches the external thread of the connecting rod 1 . The diameter of this thread groove is greater than the diameter of set screw 2 nuts. The end face of this connecting cap 5 has a through hole communicating with the above-mentioned thread groove, the diameter of this through hole is greater than the diameter of the screw rod of the set screw 2, and smaller than the diameter of the nut on the set screw 2. The screw part of the positioning screw 2 passes through the through hole, and the nut part of the positioning screw 2 is limited between the connecting rod 1 and the connecting cap 5 .

The hammer 3 is a metal sleeve, and the inner wall of one end of the metal sleeve close to the set screw 2 is provided with a limit ring 7 matched with the limit piece of the hammer. The limit ring 7 is integrally formed with the metal sleeve and directly processed by a lathe. The vertical gap between the inner wall of the metal sleeve and the limiting column 8 and the vertical gap between the limiting ring 7 and the connecting rod 1 are 0.5-1mm. The end of the metal sleeve facing away from the positioning screw 2 has an outward flange, and the outer wall of the metal sleeve is provided with anti-slip protrusions or anti-slip grooves.

The hammer limiter includes a limit post 8 fixed on the end of the connecting rod 1 facing away from the positioning screw 2 and a limit boss 6 arranged in the middle of the connecting rod 1. The limit ring 7 is located between the limit post 8 and the limit boss. Between desks 6. The inner diameter of the limiting ring 7 is smaller than the outer diameter of the limiting boss 6 and the diameter of the limiting post 8 , and larger than the diameter of the connecting rod 1 . A threaded hole is set at the center of the limit post 8, and a threaded groove is set at the corresponding end of the connecting rod 1, and the bolts are used to fix the two. The outer wall of the limit column 8 is provided with an air guiding groove 9 .

The use process of the utility model is as follows: select a suitable positioning screw 2 according to the size of the pin to be disassembled, and fix the positioning screw 2 and the connecting rod 1 with the fixed connection cap 5 used in conjunction with the positioning screw 2; Screw into the thread groove of the pin to be dismantled, slide the hammer 3 repeatedly at high speed, and use the impact of the hammer on the connecting rod 1 to disassemble the pin.

Claims (10)

1. A special tool for unloading pins, comprising a connecting rod (1), a set screw (2) coaxially arranged at one end of the connecting rod (1), and a punch (3) that slides with the connecting rod (1) ), the connecting rod (1) is provided with a hammer stopper; it is characterized in that the positioning screw (2) is threadedly connected with the connecting rod (1). 2. The special tool for pin unloading according to claim 1, characterized in that, one end of the connecting rod (1) is threadedly fitted with a connecting cap (5), and the end face of the connecting cap (5) is provided with a through hole, so that The screw part of the positioning screw (2) passes through the through hole, and the nut part of the positioning screw (2) is limited between the connecting rod (1) and the connecting cap (5). 3. The special tool for pin unloading according to claim 1, characterized in that the hammer (3) is a metal sleeve, and the inner wall of the end of the metal sleeve close to the set screw (2) is provided with the hammer The limit ring (7) matched with the limit piece. 4. The special tool for pin unloading according to claim 3, characterized in that, the hammer stopper includes a stopper column ( 8) and the limiting boss (6) arranged in the middle of the connecting rod (1), the limiting ring (7) is located between the limiting post (8) and the limiting boss (6). 5. The special tool for unloading pins according to claim 4, characterized in that, the limiting column (8) is threadedly connected with the connecting rod (1). 6. The special tool for unloading pins according to claim 4, characterized in that, the outer diameter of the end of the limiting boss (6) close to the hammer (3) is larger than the outer diameter of the other end. 7. The special tool for pin unloading according to claim 4, characterized in that, the vertical gap between the inner wall of the metal sleeve and the limit column (8) and the distance between the limit ring (7) and the The vertical gap between the connecting rods (1) is 0.5-1mm. 8. The special tool for pin unloading according to claim 4, characterized in that, the outer wall of the limit post (8) is provided with an air guide groove (9). 9. The special tool for pin unloading according to claim 3, characterized in that, the end of the metal sleeve facing away from the set screw (2) has an outward flange. 10. The special tool for unloading pins according to claim 9, characterized in that, the outer wall of the hammer (3) is provided with anti-slip protrusions or anti-slip grooves. the

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