Pin puller and assembling method of pin puller

Abstract

The invention discloses a pin puller which comprises a standard bolt, a first converter, a second converter and a connecting rod. The head part of the first converter is provided with a through hole for a stud of a standard bolt to pass through, and the tail part of the first converter is provided with a connecting part connected with the second converter; the second converter is provided with a tip, a first connecting part and a second connecting part; the tip is used for fixing a standard component bolt in the first converter, and the first connecting part is used for connecting and fixing the first converter and the second converter; the second connecting part is provided with an external thread and used for being fixedly connected with the head of the connecting rod, and the tail of the connecting rod is provided with a protruding stress part. The special pin pulling head is replaced by the standard bolt, so that the cost of replacing quick-wear parts is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment maintenance, and in particular to a pin puller and an assembling method of the pin puller. Background Art

[0002] In the daily maintenance of mechanical equipment, parts connected by cylindrical pins are often encountered, and pin pullers are used at this time. According to the different sizes of the cylindrical pins, the threaded holes on the rear end face also have various specifications. The common ones are M3, M4, M5, M6, M8, etc. Generally, a special pin puller is made to connect the threaded hole on the rear end face of the cylindrical pin and the connecting rod. When in use, screw the fixed end of the double-headed threaded head of the pin puller into the connecting rod, and screw the other end into the threaded hole of the cylindrical pin. After the connection is reliable, you can pull the hammer by hand to pull out the pin. After the pin puller has been used many times, the threads connected to the cylindrical pin often rot. Once the threads are rotten, the pin puller can only be remade, so the efficiency is relatively low and the maintenance cost is also high. Summary of the invention

[0003] The technical problem to be solved by the present invention is how to provide a low-cost pin puller so that the connecting part of the pin puller connected with the threaded hole on the rear end surface of the cylindrical pin can be easily replaced.

[0004] In order to solve the above technical problems, the present invention provides a pin puller, comprising a standard bolt, a first converter, a second converter and a connecting rod;

[0005] The head of the first converter has a through hole for the stud of the standard bolt to pass through, and the tail of the first converter has a connecting portion connected to the second converter;

[0006] The second converter has a top, a first connecting part and a second connecting part; the top is used to fix the standard bolt in the first converter, and the first connecting part is used to connect and fix the first converter and the second converter; the second connecting part has an external thread for fixed connection with the head of the connecting rod, and the tail of the connecting rod has a raised force-bearing part.

[0007] Preferably, the connecting portion has an internal threaded hole, and the connecting portion of the first converter is connected to the first connecting portion of the second converter via a threaded pair.

[0008] Preferably, the lower end of the through hole of the first converter has at least one step portion.

[0009] Preferably, the standard bolt is a hexagon socket bolt.

[0010] The present invention also provides an assembly method of a pin puller, comprising the following steps:

[0011] Step S1, passing the screw portion of the standard bolt through the through hole of the first converter, and screwing the exposed screw portion of the standard bolt into the cylindrical pin to be pulled out;

[0012] Step S2, fixing the second converter to the first converter so that the top end abuts against the bolt head of the standard bolt;

[0013] Step S3, passing the weight block with the through hole through the connecting rod, and fixing the connecting rod to the second connecting portion of the second converter.

[0014] Compared with the prior art, the present invention reduces the cost of replacing wearing parts by using standard bolts to replace special pin pulling heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0016] Figure 1 It is a structural schematic diagram of the pin puller of Example 1;

[0017] Figure 2 A schematic diagram of an implementation structure of the first converter of Example 1;

[0018] Figure 3 is a schematic structural diagram of a second converter in Example 1;

[0019] Figure 4 This is a schematic diagram of another implementation structure of the first converter of Example 1. DETAILED DESCRIPTION

[0020] The following describes the implementation methods of the present invention through specific specific embodiments, and those skilled in the art can fully understand other advantages and technical effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through different specific implementation methods, and the details in this specification can also be applied based on different viewpoints, and various modifications or changes can be made without deviating from the overall design concept of the invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other in the absence of conflict. The following exemplary embodiments of the present invention can be implemented in a variety of different forms and should not be interpreted as being limited to the specific embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary specific embodiments to those skilled in the art.

[0021] Example 1

[0022] like Figure 1 As shown, the pin puller provided in this embodiment includes a standard bolt 1, a first converter 2, a second converter 3 and a connecting rod 4.

[0023] like Figure 2 As shown, the head of the first converter 2 has a through hole 21 for the stud of the standard bolt 1 to pass through, and the tail of the first converter 2 has a connecting portion 22 connected to the second converter 3. The connecting portion 22 has an internal threaded hole. Figure 3 As shown, the second converter 3 has a tip 31, a first connection portion 32 and a second connection portion 33; the tip 31 is used to fix the standard bolt 1 in the first converter 2, the first connection portion 32 is adapted to the connection portion 22, has an external thread, and is used to connect and fix the first converter 2 and the second converter 3; the second connection portion 33 has an external thread and is used to be fixedly connected to the head of the connecting rod 4. The tail of the connecting rod 4 has a protruding force-bearing portion, and when pulling out the pin, a force is applied to the protruding force-bearing portion to pull out the cylindrical pin.

[0024] Since standard bolts are used, when the threads of standard bolts are damaged after repeated use, it is only necessary to replace them with new standard bolts without remaking and processing special pin puller heads.

[0025] Preferably, if Figure 4 As shown, the lower end of the through hole 21 of the first converter 2 has at least one step portion, and in this embodiment, two step portions with different diameters are used to accommodate the bolt heads of standard bolts with different diameters.

[0026] Preferably, the standard bolt 1 is a hexagon socket bolt, and the head of the tip 31 is adapted to the hexagon socket bolt head, which is beneficial to the fixation of the standard bolt 1 .

[0027] Example 2

[0028] This embodiment provides an assembly method of the pin puller of embodiment 1, comprising the following steps:

[0029] Step S1, passing the screw portion of the standard bolt through the through hole of the first converter, and screwing the exposed screw portion of the standard bolt into the cylindrical pin to be pulled out;

[0030] Step S2, fixing the second converter to the first converter so that the top end abuts against the bolt head of the standard bolt;

[0031] Step S3, passing the weight block with the through hole through the connecting rod, and fixing the connecting rod to the second connecting portion of the second converter.

[0032] After assembly is completed, the weight is moved to hit the protrusion at the tail of the connecting rod, so as to apply a pull-out force to the cylindrical pin and finally pull out the cylindrical pin.

[0033] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. A pin puller, characterized in that: It includes a standard bolt, a first converter, a second converter and a connecting rod; The head of the first converter has a through hole for the stud of the standard bolt to pass through, and the tail of the first converter has a connecting portion connected to the second converter; The second converter has a top, a first connecting part and a second connecting part; the top is used to fix the standard bolt in the first converter, and the first connecting part is used to connect and fix the first converter and the second converter; the second connecting part has an external thread for fixed connection with the head of the connecting rod, and the tail of the connecting rod has a raised force-bearing part.

2. The pin puller according to claim 1, characterized in that: The connecting portion has an internal threaded hole, and the connecting portion of the first converter is connected to the first connecting portion of the second converter via a threaded pair.

3. The pin puller according to claim 1, characterized in that: The through hole of the first converter has at least one step portion at a lower end thereof.

4. The pin puller according to claim 1, characterized in that: The standard bolt is a hexagon socket bolt.

5. A method for assembling a pin puller, characterized in that: The pin puller is the pin puller according to any one of claims 1 to 4; the assembly method comprises the following steps: Step S1, passing the screw portion of the standard bolt through the through hole of the first converter, and screwing the exposed screw portion of the standard bolt into the cylindrical pin to be pulled out; Step S2, fixing the second converter to the first converter so that the top end abuts against the bolt head of the standard bolt; Step S3, passing the weight with the through hole through the connecting rod, and fixing the connecting rod to the second connecting portion of the second converter.

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