A hand-held device for assembling press nuts

Abstract

The application provides a hand-held device for assembling press-fitting nuts, comprising a press-fitting base provided with a preformed hole, characterized in that it further comprises a mounting base parallel to the upper surface of the press-fitting base, a hand-held part arranged on the upper surface of the press-fitting base for fixing the press-fitting base, a guide column with a guide groove vertically arranged between the press-fitting base and the mounting base, the guide column comprising a screw push rod, a sliding block and a punch, the screw push rod being provided with a bolt head at the top end and having the other end penetrating the mounting base in sequence and pressing the sliding block to move in the guide groove, the sliding block being provided with the press-fitting punch inserted into the bottom surface, and the screw push rod driving the punch to move in alignment with the preformed hole through the sliding block, so that the press-fitting nuts are assembled to ensure the accurate press-fitting force and flaring angle.

Description

Technical Field

[0001] This utility model relates to the field of mechanical assembly, specifically to a handheld device for assembling press-fit nuts. Background Technology

[0002] In the prior art, press-fit nuts are usually made of metal and are a type of efficient and reliable fastener that is widely used in various industries. They have advantages such as high strength and easy installation. The method of use is to install them into a pre-drilled hole and then apply pressure to them with mechanical or manual tools to deform them, thereby achieving fixation in the hole. They are then connected to other fastener structures through the threads on their inner or outer surfaces.

[0003] However, in some fields, press-fit nuts are used with smaller diameters of only 4-7 mm, are hollow in the middle and have thin walls (0.4-1.5 mm thick), and there are requirements for the flaring angle after installation. In such cases, directly using mechanical equipment for riveting installation not only easily causes cracking and damage to the press-fit nut, but also makes it difficult to control the flaring angle, leading to errors. Traditional press-fit assembly methods mainly use two methods: manual hammering and large presses. Manual hammering suffers from high labor intensity, poor assembly quality, and low work efficiency, while large presses have complex structures, high costs, are unsuitable for small-batch production, and are cumbersome to operate and have limited application scenarios.

[0004] Therefore, there is an urgent need for a press-fit nut assembly device that is simple in structure, easy to operate, and suitable for multiple application scenarios. Summary of the Invention

[0005] This utility model provides a handheld device for assembling press-fit nuts, solving the problems of cracking and damage to press-fit nuts and difficulty in controlling the flaring angle. It achieves precise pressing force and flaring angle control during nut installation. The technical solution provided by this utility model is as follows:

[0006] This utility model discloses a handheld device for assembling press-fit nuts, including a press-fit base with a pre-drilled hole and a mounting base parallel to the top of the press-fit base. The handheld part is disposed on the upper surface of the press-fit base for fixing the press-fit base. A guide post with a guide groove is vertically disposed between the press-fit base and the mounting base. The guide post includes a helical push rod, a slider, and a punch. The top end of the helical push rod is provided with a bolt head, and the other end passes through the mounting base in sequence to press the slider and move it in the guide groove. The bottom surface of the slider is inserted with a press-fit punch. The helical push rod drives the punch to move in alignment with the pre-drilled hole through the slider.

[0007] While adopting the above technical solutions, this utility model can also adopt or combine the following technical solutions: the spiral push rod is provided with a second threaded post near the bolt head, the mounting base is provided with a threaded through hole, the threaded through hole and the pre-made hole are coaxially arranged, and the threaded through hole is threadedly connected to the second threaded post of the spiral push rod; an opening is opened on the outer side of the guide post to facilitate the slide block and punch to be disassembled and installed in the guide groove and move along the extension direction of the guide groove.

[0008] Through the above technical solution, the guide groove is used to guide the movement direction of the slider, which improves the accuracy of pressing and makes it easier for operators to observe the positioning.

[0009] As a preferred technical solution of this utility model, the press-fit base and the mounting base are respectively fixed to both ends of the hand-held part, the hand-held part is columnar, and the hand-held part, the mounting base, the press-fit base and the guide groove form a "U" shaped structure.

[0010] As a preferred technical solution of this utility model, the bolt push rod is provided with a first threaded post away from the bolt head, and a connecting screw is provided in the middle. The top surface of the slider is provided with a first threaded hole and the first threaded post of the spiral push rod is threadedly connected. The thread directions of the first threaded post and the second threaded post are opposite. The outer diameter of the first threaded post and the outer diameter of the connecting screw are smaller than the inner diameter of the threaded through hole, respectively. The bottom surface of the slider is provided with a mounting hole, and the mounting end of the press punch is inserted into the mounting hole of the slider.

[0011] As a preferred technical solution of this utility model, the press-fitting punch includes a connecting rod, a transition rod, a press-fitting rod, and a guide head. One end of the connecting rod is detachably connected to the slider, and the other end is fixedly connected to the transition rod. From the end of the press-fitting punch to the transition rod, a guide head and a frustum-shaped press-fitting rod are provided in sequence. Both the guide head and the transition rod are cylindrical, and the outer diameter of the guide head is smaller than the outer diameter of the transition rod.

[0012] The advantages of the above technical solution are that the guide head is set at the front end of the punch, and is used to enter the inlet position of the contact part between the press-fit nut and the workpiece during press-fitting, so as to achieve precise guidance in the press-fitting direction, keep the press-fit nut and the workpiece coaxial, and ensure the safe and accurate installation of the press-fit nut. The working rod is used to connect the rear end of the guide head and to apply pressure to the press-fit nut during the press-fitting process.

[0013] As a preferred technical solution of this utility model, the end of the press-fitting punch connected to the slider is provided with an annular groove. The slider also includes a lock bolt. The side of the slider is provided with a lock thread hole that connects to the mounting hole. The lock bolt is inserted into the lock thread hole and embedded in the annular groove of the press-fitting punch to lock and fix the press-fitting punch in the slider.

[0014] As a preferred technical solution of this utility model, the outer side of the press-fitting punch is provided with a marking line, and the guide post is provided with a scale line corresponding to the marking line, which is used to indicate the pressing distance and flaring angle of the press-fitting punch to the press-fitting nut.

[0015] The advantage of the above technical solution is that by aligning the marking lines with the scale lines, the punch of the press-fitting punch can be quantitatively moved to the press-fitting nut, thereby improving the pressure application accuracy of the press-fitting nut.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] First, this utility model uses a stamping structure composed of a spiral push rod, a slider, and a pressing punch, combined with a step-by-step pressing assembly method. By controlling the rotation direction of the spiral push rod and the reciprocating movement of the slider, and through the cooperation of the scale lines of the guide groove and the marking lines of the pressing punch, it achieves precise application of pressing force and control of the opening angle of the pressing nut, ensuring the flared shape after pressing, and effectively avoiding the cracking and damage of micro-pressing nuts that are easily caused by traditional manual hammering and large presses.

[0018] Secondly, this utility model has a simple structure and is easy to operate. It does not require a complex support structure, which reduces equipment costs. In addition, it reduces manual operation during pressing, improves production efficiency, and facilitates maintenance and management.

[0019] Third, the handheld structure enhances the flexibility of the pressing operation, enabling pressing in confined spaces and various scenarios, making it highly adaptable. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a structural diagram of the present invention;

[0022] Figure 2 This is an exploded view of the overall structure of this utility model;

[0023] Figure 3 This is a side sectional view of the overall structure of this utility model;

[0024] Figure 4 This is a structural diagram of the slider of this utility model;

[0025] Figure 5 This is a structural diagram of the press-fit punch of this utility model;

[0026] Figure 6 This is an installation diagram of this utility model;

[0027] Figure 7 This is a diagram showing the installation steps of this utility model;

[0028] In the diagram: 1. Press-fit base; 1-1. Pre-drilled hole; 2. Mounting seat; 3. Guide post; 3-1. Threaded through hole; 3-2. Guide groove; 3-3. Scale line; 4. Hand-held part; 5. Helical push rod; 5-1. First threaded post; 5-2. Connecting screw; 5-3. Second threaded post; 5-4. Bolt head; 6. Slider; 6-1. Mounting hole; 6-2. Anti-loosening bolt hole; 6-3. First threaded hole; 6-4. Anti-loosening bolt; 7. Press-fit punch; 7-1. Guide head; 7-2. Working rod; 7-3. Transition rod; 7-4. Groove; 8. Press-fit nut. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] like Figure 1-3 As shown in the illustration, this application provides a handheld device for assembling press-fit nuts, including a press-fit base 1 with pre-drilled holes 1-1 and a mounting seat 2 parallel to the press-fit base 1. A handheld part 4 is disposed on the upper surface of the press-fit base 1 for fixing the press-fit base 1. The press-fit base 1 and the mounting seat 2 are respectively fixed to both ends of the handheld part 4. The handheld part 4 is columnar. The handheld part 4, the mounting seat 2, the press-fit base 1, and the guide groove 3-2 form a "U"-shaped structure. The outer surface of the handheld part 4 is provided with anti-slip texture to increase the friction coefficient of the outer surface of the handheld part 4, making it easier for the operator to hold it stably. A guide post 3 with a guide groove 3-2 is vertically provided between the press-fit base 1 and the mounting seat 2. The guide post 3 includes a spiral push rod 5, a slider 6, and a punch. This device adopts a handheld structure, which improves the flexibility of the press-fit operation. It can be used for press-fitting in confined spaces and various scenarios, making it highly applicable. The top of the spiral push rod 5 is provided with a bolt head 5-4, and the other end passes through the mounting base to press the slider 6 and move it into the guide groove 3-2. A pressing punch 7 is inserted into the bottom surface of the slider 6. The spiral push rod 5 drives the punch to move in alignment with the pre-drilled hole 1-1 through the slider 6. The guide groove 3-2 is used to guide the movement direction of the slider 6, which improves the accuracy of pressing and facilitates the operator to observe the positioning. The spiral push rod 5 is provided with a second threaded post 5-3 near the bolt head. The mounting base (2) is provided with a threaded through hole 3-1. The threaded through hole 3-1 and the pre-drilled hole 1-1 are coaxially arranged. The threaded through hole 3-1 is threadedly connected to the second threaded post 5-3 of the spiral push rod 5. An opening is opened on the outside of the guide post 3 to facilitate the slider 6 and the punch to be disassembled and installed in the guide groove 3-2 and move along the extension direction of the guide groove 3-2. Figure 5 As shown, the press-fit punch 7 includes a connecting rod 7-5, a transition rod 7-3, a press-fit rod 7-2, and a guide head 7-1. One end of the connecting rod 7-5 is detachably connected to the slider 6, and the other end is fixedly connected to the transition rod 7-3. From the end of the press-fit punch 7 towards the transition rod 7-3, the guide head 7-1 and the frustum-shaped press-fit rod 7-2 are sequentially arranged. Both the guide head 7-1 and the transition rod 7-3 are cylindrical, and the outer diameter of the guide head 7-1 is smaller than the outer diameter of the transition rod 7-3. During press-fitting, the guide head 7-1 first enters the flared end of the press-fit nut to achieve precise guidance in the press-fitting direction, ensuring accurate installation of the press-fit nut. The press-fit rod 7-2 is connected to the rear end of the guide head 7-1 and is used to apply pressure to the press-fit nut during the press-fitting process to flare it. It should be noted that the axial length of the pressing rod 7-2 can be set differently according to the different requirements of the flaring angle of the pressing nut, so as to achieve different flaring angles of the pressing rod 7-2. In this embodiment, the pressing punch 7 has three specifications, and the inclination angles of the pressing rod 7-2 are 30 degrees, 45 degrees and 60 degrees respectively. Figure 7 As shown, in other embodiments, press-fitting punches 7 with different flaring angles can be manufactured by changing the axial length of the press-fitting rod 7-2.

[0032] like Figure 1 As shown, the outer side of the pressing punch 7 is provided with a marking line, and the guide post 3 is provided with a scale line 3-3 corresponding to the marking line. These marking lines indicate the pressing distance and flaring angle of the pressing punch 7 on the pressing nut. By aligning the marking line with the scale line 3-3, the pressing punch 7's movement on the pressing nut is quantitatively controlled, improving the pressing accuracy of the nut. Both the marking line and the scale line 3-3 are made of wear-resistant material. The cooperation between the marking line and the scale line 3-3 allows operators to more accurately control the pressing distance, reducing pressing errors caused by human factors.

[0033] Example 2

[0034] Based on Example 1, such as Figure 2 As shown, the bolt push rod 5 has a first threaded post 5-1 away from the bolt head, and a connecting screw 5-2 in the middle. The top surface of the slider 6 has a first threaded hole 6-3 and is threadedly connected to the first threaded post 5-1 of the helical push rod 5. The threads of the first threaded post 5-1 and the second threaded post 5-3 are opposite in direction. The outer diameter of the first threaded post 5-1 and the outer diameter of the connecting screw 5-2 are smaller than the threaded post 5-1.

[0035] The inner diameter of the through hole 3-1; the bottom surface of the slider 6 is provided with a mounting hole 6-1, and the mounting end of the pressing punch 7 is inserted into the mounting hole 6-1 of the slider 6. The slider 6 is used to maintain the alignment of the helical push rod 5, the pressing punch 7, and the pressing nut during the pressing process. Figure 5-6As shown, the end of the press-fit punch 7 connected to the slider 6 is provided with an annular groove 7-4. The slider 6 also includes a locking bolt 6-4. The side of the slider 6 is provided with a locking threaded hole that connects to the mounting hole 6-1. The locking bolt 6-4 is inserted into the locking threaded hole and embedded in the annular groove 7-4 of the press-fit punch 7, which is used to lock and fix the press-fit punch 7 in the slider 6. Through the cooperation of the locking bolt 6-4 and the annular groove 7-4, the press-fit punch 7 is effectively prevented from falling off during assembly. Furthermore, after the press-fit nut is pressed, the deformation of the press-fit nut may cause it to jam with the press-fit punch 7. At this time, when the spiral push rod 5 is turned counterclockwise, the locking bolt 6-4 can help the press-fit punch 7 to be more easily disengaged from the press-fit nut, which facilitates the replacement of the punch and improves the applicability and ease of operation of the equipment.

[0036] This device has a simple structure and is easy to operate. It does not require a complex support structure, which reduces equipment costs. In addition, it reduces manual operation during pressing, improves production efficiency, and is easy to maintain and manage.

[0037] Workflow:

[0038] like Figure 6-7 As shown, the method for assembling press-fit nuts is as follows:

[0039] Step 1: Place the press-fit nut into the pre-drilled hole 1-1 of the press-fit base 1. The end of the press-fit nut to be press-fitted should pass through the press-fit hole of the workpiece to ensure that the nut is in the press-fitting position. Step 2: Install the slider 6 and the press-fitting punch 7 into the guide groove 3-2 in sequence, and tighten the anti-loosening bolt 6-4 to fix the press-fitting punch 7. Step 3: Insert the connecting screw 5-2 of the spiral push rod 5 into the threaded through hole 3-1 of the mounting base 2. At this time, the connecting screw 5-2 is inside the threaded through hole 3-1. Specifically, the connecting screw 5-2 of the spiral push rod 5 enables the first threaded post 5-1 to be threadedly connected to the first threaded hole 6-3 of the slider 6, and the second threaded post 5-3 to be threadedly connected to the threaded through hole 3-1 of the mounting base 2 during subsequent installation. By rotating the helical push rod 5 counterclockwise, the first threaded post 5-1 is screwed into the first threaded hole 6-3 of the slider 6 to its bottom end. Then, the second threaded post 5-3 of the helical push rod 5 is inserted into the threaded through hole 3-1 of the mounting base 2, and the first threaded post 5-1 and the second threaded post 5-3 form a reverse thread engagement. This allows the slider 6 and the pressing punch 7 to move coaxially and controllably in the guide groove 3-2 when the helical push rod 5 is rotated subsequently, aligning with the pressing nut. Step 4: Before pressing, test-fit and record the preset scale value of scale line 3-3; during pressing, turn the spiral push rod 5 clockwise to form a reverse thread engagement between the second threaded post 5-3, the threaded through hole 3-1 of the mounting base 2, the first threaded post 5-1, and the first threaded hole 6-3 of the slider 6. This causes the second threaded post 5-3 to be threadedly connected to the threaded through hole 3-1 of the mounting base 2, and the first threaded post 5-1 to be threadedly connected to the first threaded hole 6-3 of the slider 6. This drives the slider 6 to move in the guide groove 3-2 toward the pre-drilled hole 1-1, causing the pressing punch 7 to apply pressure to the pressing nut. Step 5: After applying pressure, turn the spiral push rod 5 counterclockwise to drive the slider 6 to move away from the pre-drilled hole 1-1 in the guide groove 3-2, causing the pressing punch 7 to move away from the pressing nut, completing one pressing operation. Step Six: Based on the required pressing distance and flaring angle of the nut, replace the pressing punch 7 with a different angle and repeat steps four and five. Through the cooperation of the guide groove 3-2 and the scale line 3-3, the movement of the pressing punch 7 is quantitatively controlled to achieve precise positioning in the pressing process, ensuring that the pressing distance and flaring angle meet the design requirements until the pressing is completed.

[0040] It should be noted that before pressing, the preset scale value of scale line 3-3 should be recorded during trial assembly, referring to the preset scale value required during the trial assembly, based on the flaring angle and pressing degree. During pressing, the pressing displacement should be monitored in real time according to the indication of scale line 3-3, and the pressing should be gradually performed according to the preset scale value recorded during the trial assembly stage.

[0041] Apply pressure until the scale indicates the required pressing distance for the corresponding flaring angle, ensuring accurate pressing without exceeding the preset scale value to prevent damage to the threads.

[0042] This utility model utilizes a stamping structure composed of a spiral push rod 5, a slider 6, and a pressing punch 7, combined with a step-by-step pressing assembly method. By controlling the rotation direction of the spiral push rod 5 and the reciprocating movement of the slider 6, and through the cooperation of the scale line 3-3 of the guide groove 3-2 and the marking line of the pressing punch 7, it achieves precise application of pressing force and control of the flaring angle of the pressing nut, ensuring the flaring shape after pressing and effectively avoiding the cracking and damage of micro-pressing nuts that are easily caused by traditional manual hammering and large presses.

[0043] In this embodiment, as Figure 7 As shown, a small aero-engine diffuser has circumferentially distributed press-fit nuts. The press-fit nuts have a diameter of 4.6 mm, and after press-fitting, their flaring angle is required to be 60 degrees, with a flared diameter of 5.6 mm. The internal thread structure of the press-fit nut must not be damaged during press-fitting. The height of the contact portion between the press-fit nut and the workpiece is 1.5 mm. The press-fitting distance must be controlled within 0.6 mm, and the flaring must be completed within a height range of 0.9 mm to achieve a final flaring angle of 60°. After the flaring press-fitting is completed, the distance error between the press-fitting punch 7 and the starting line of the nut thread must be controlled within 0.1 mm to prevent damage to the threads.

[0044] The operator first places the press-fit nut into the pre-drilled hole 1-1 of the press-fit base 1. The end of the press-fit nut to be press-fitted passes through the press-fit hole of the workpiece. Then, the 30-degree press-fit punch 7 is installed in the mounting hole 6-1 of the slider 6. The anti-disengagement bolt 6-4 is tightened to fix the press-fit punch 7. Then, the connecting screw 5-2 of the spiral push rod 5 is inserted into the threaded through hole 3-1 of the mounting base 2. At this time, the connecting screw 5-2 is in the threaded through hole 3-1. Specifically, the connecting screw 5-2 of the spiral push rod 5 can realize the threaded connection between the first threaded post 5-1 and the first threaded hole 6-3 of the slider 6, and the threaded connection between the second threaded post 5-3 and the threaded through hole 3-1 of the mounting base 2 during the subsequent installation process. By rotating the helical push rod 5 counterclockwise, the first threaded post 5-1 is screwed into the first threaded hole 6-3 of the slider 6 to its bottom end. Then, the second threaded post 5-3 of the helical push rod 5 is inserted into the threaded through hole 3-1 of the mounting base 2, and the first threaded post 5-1 and the second threaded post 5-3 form a reverse thread engagement. This allows the slider 6 and the press-fit punch 7 to move coaxially and controllably in the guide groove 3-2 when the helical push rod 5 is rotated subsequently, aligning with the press-fit nut 8.

[0045] Before pressing, the preset scale value of scale line 3-3 is recorded during trial assembly. The preset scale measurement is referenced based on the flaring angle and pressing degree, and the required measurement during the trial assembly. During pressing, the pressing displacement is monitored in real time according to the indication of scale line 3-3. Pressing is gradually applied according to the preset scale value recorded during the trial assembly until the scale indication reaches the pressing distance required for the corresponding flaring angle. The spiral push rod 5 is then turned clockwise, causing the second threaded post 5-3, the threaded through hole 3-1 of the mounting base 2, and the first threaded post 5-1 and the first threaded hole 6-3 of the slider 6 to form a reverse thread engagement, so that the second threaded post 5-3 and the threaded through hole 3-1 of the mounting base 2 are in contact with each other.

[0046] The first threaded post 5-1 is threaded into the first threaded hole 6-3 of the slider 6, thereby driving the slider 6 to move towards the pre-drilled hole 1-1 in the guide groove 3-2 according to the scale line 3-3, so that the pressing punch 7 can accurately apply pressure to the pressing nut. After the pressure is applied, the helical push rod 5 is turned counterclockwise, thereby driving the slider 6 to move away from the pre-drilled hole 1-1 in the guide groove 3-2, so that the pressing punch 7 moves away from the pressing nut, completing one pressing operation.

[0047] The operator removes the 30-degree press-fit punch 7 and slider 6, and re-inserts the 45-degree press-fit punch 7 and slider 6 into the guide groove 3-2. Following the indication on scale line 3-3, the operator again tightens the helical push rod 5 to apply pressure, turning it counterclockwise to disengage the press-fit punch 7 from the press-fit nut 8. The operator then removes the 45-degree press-fit punch 7 and slider 6, and re-inserts the 60-degree press-fit punch 7 and slider 6 into the guide groove 3-2. Following the indication on scale line 3-3, the operator again tightens the helical push rod 5 to apply pressure until the press-fit nut is flared within a 0.9 mm height range, reaching a final flaring angle of 60°, indicating successful press-fitting. Finally, the operator turns the helical push rod 5 counterclockwise to disengage the press-fit punch 7 from the press-fit nut 8.

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A handheld device for assembling press-fit nuts, comprising a press-fit base (1) with a pre-drilled hole (1-1), characterized in that: It also includes a mounting base (2) parallel to the press base (1), and a hand-held part (4) is provided on the upper surface of the press base (1) for fixing the press base (1). A guide post (3) with a guide groove (3-2) is provided vertically between the press base (1) and the mounting base (2). The guide post (3) includes a spiral push rod (5), a slider (6) and a punch. The top end of the spiral push rod (5) is provided with a bolt head (5-4), and the other end passes through the mounting base to press the slider (6) and move in the guide groove (3-2). The bottom surface of the slider (6) is inserted with a press punch (7). The spiral push rod (5) drives the punch to move in alignment with the pre-made hole (1-1) through the slider (6).

2. The handheld device according to claim 1, characterized in that: The spiral push rod (5) is provided with a second threaded post (5-3) near the bolt head. The mounting base (2) is provided with a threaded through hole (3-1). The threaded through hole (3-1) and the pre-made hole (1-1) are coaxially arranged. The threaded through hole (3-1) is threadedly connected to the second threaded post (5-3) of the spiral push rod (5). An opening is opened on the outside of the guide post (3) to facilitate the disassembly and assembly of the slider (6) and the punch in the guide groove (3-2) and their movement along the extension direction of the guide groove (3-2).

3. The handheld device according to claim 2, characterized in that: The press-fit base (1) and the mounting base (2) are respectively fixed to both ends of the hand-held part (4). The hand-held part (4) is columnar. The hand-held part (4), the mounting base (2), the press-fit base (1) and the guide groove (3-2) form a "U" shaped structure.

4. The handheld device according to claim 2, characterized in that: The spiral push rod (5) has a first threaded post (5-1) away from the bolt head and a connecting screw (5-2) in the middle. The top surface of the slider (6) has a first threaded hole (6-3) and is threaded to the first threaded post (5-1) of the spiral push rod (5). The threads of the first threaded post (5-1) and the second threaded post (5-3) are opposite. The outer diameter of the first threaded post (5-1) and the outer diameter of the connecting screw (5-2) are smaller than the inner diameter of the threaded through hole (3-1). The bottom surface of the slider (6) has a mounting hole (6-1), and the mounting end of the press punch (7) is inserted into the mounting hole (6-1) of the slider (6).

5. The handheld device according to claim 1, characterized in that: The press-fit punch (7) includes a connecting rod (7-5), a transition rod (7-3), a press-fit rod (7-2), and a guide head (7-1). One end of the connecting rod (7-5) is detachably connected to the slider (6), and the other end is fixedly connected to the transition rod (7-3). From the end of the press-fit punch (7) to the transition rod (7-3), the guide head (7-1) and the frustum-shaped press-fit rod (7-2) are arranged in sequence. The guide head (7-1) and the transition rod (7-3) are both cylindrical, and the outer diameter of the guide head (7-1) is smaller than the outer diameter of the transition rod (7-3).

6. The handheld device according to claim 5, characterized in that: The end of the press-fit punch (7) connected to the slider (6) is provided with an annular groove (7-4). The slider (6) also includes a lock bolt (6-4). The side of the slider (6) is provided with a lock thread hole and connected to the mounting hole (6-1). The lock bolt (6-4) is inserted into the lock thread hole and embedded in the annular groove (7-4) of the press-fit punch (7) for locking and fixing the press-fit punch (7) in the slider (6).

7. The handheld device according to claim 6, characterized in that: The press-fit punch (7) has an identification line on its outer side, and the guide post (3) has a scale line (3-3) corresponding to the identification line, which is used to indicate the pressing distance and flaring angle of the press-fit punch (7) to the press-fit nut.

Images