Positioning pin hole protection device used in part assembling process

Abstract

The utility model provides a positioning pin hole protection device used in a part assembling process, which comprises a lower pin sleeve matched with a first pin hole on a first part, and a pin sleeve adjusting mechanism used for adjusting the position of the lower pin sleeve is arranged at the bottom end of the first part; the upper pin sleeve is used for being matched with a second pin hole in a second part; cylindrical pins are mounted in the upper pin sleeve and the lower pin sleeve in a matched manner; a positioning sleeve is installed at the top end of the second part in a supporting mode, a threaded pull rod is arranged in the positioning sleeve, the bottom end of the threaded pull rod is matched and connected with the top end of the cylindrical pin, and an adjusting nut is matched outside the threaded pull rod and located at the top end of the positioning sleeve through threads. In the part assembling process, on the premise that the assembling precision is not affected, the device prevents the matching face of the positioning cylindrical pin hole from being damaged, the quality problem is completely eradicated, the assembling efficiency of the positioning cylindrical pin hole is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, and mainly relates to a positioning pin hole protection device used in the process of parts assembly. Background Art

[0002] Locating cylindrical pin holes are widely used in the machinery manufacturing industry. Part assembly requires not only bolt fixation but also precise positioning and the prevention of installation errors. Locating cylindrical pin holes offer advantages such as simple structure, good neutrality, high load-bearing capacity, and excellent variable load and impact resistance. However, cylindrical pin holes also have drawbacks. They require high machining precision on mating surfaces, resulting in high disassembly forces during assembly. Repeated assembly and disassembly can easily scratch and damage mating surfaces, reducing the pin hole's positioning accuracy.

[0003] With the continuous improvement of product design requirements, in order to ensure product quality and continuously optimize processing plans, multi-part combination processing has become the norm. However, due to the limitations of processing equipment and lifting equipment, some products face multiple disassembly and assembly of parts during the processing process. Each disassembly and assembly will increase the quality risk of scratches and squeezes on the mating surfaces of the locating cylindrical pin holes, and the assembly efficiency will also decrease, which increases the cost of the enterprise in terms of both quality and production progress. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a positioning pin hole protection device for use in the parts assembly process. During the parts assembly process, the device prevents damage to the mating surface of the positioning cylindrical pin hole without affecting the assembly accuracy. It not only eliminates the occurrence of quality problems, but also improves the assembly efficiency of the positioning cylindrical pin hole and reduces production costs.

[0005] In order to achieve the above technical features, the purpose of the utility model is achieved as follows: a positioning pin hole protection device for use in a parts assembly process, comprising a lower pin sleeve for matching with a first pin hole on a first part, and a pin sleeve adjustment mechanism for adjusting the position of the lower pin sleeve provided at the bottom end of the first part;

[0006] Also included is an upper pin sleeve for cooperating with a second pin hole on a second part;

[0007] The upper pin sleeve and the lower pin sleeve are internally fitted with cylindrical pins;

[0008] The top support of the second part is installed with a positioning sleeve, the interior of the positioning sleeve is provided with a threaded pull rod, the bottom end of the threaded pull rod is connected with the top end of the cylindrical pin, and the outside of the threaded pull rod is located at the top end of the positioning sleeve and is fitted with an adjusting nut through a thread.

[0009] The pin sleeve adjustment mechanism includes a stopper, which is fixed to the bottom end of the first part through a welding point and is coaxially arranged with the first pin hole; an adjusting bolt is installed inside the stopper through threaded transmission, and the top end of the adjusting bolt contacts and cooperates with the bottom end of the lower pin sleeve.

[0010] A first threaded hole for matching with an adjusting bolt is processed at the center of the stopper.

[0011] The center of the upper pin sleeve is processed with a first through hole for matching with the cylindrical pin, the top transition of the first through hole is provided with a first stepped hole, the inner cavity edge of the bottom end of the first through hole is provided with a first inner chamfer, and the outer edge of the bottom end of the first through hole is provided with a first outer chamfer.

[0012] A second through hole for cooperating with the cylindrical pin is processed in the center of the lower pin sleeve, the bottom end of the second through hole is connected to the third through hole, the top end of the second through hole is connected to the second stepped hole, the top outer edge of the second stepped hole is processed with a second outer chamfer, and the outside of the lower pin sleeve and the end where the third through hole is located are processed with a first outer tapered end.

[0013] The cylindrical pin includes a pin column body, the top of the pin column body is processed with a top stepped hole, the center of the top stepped hole is processed with a center threaded hole, the center threaded hole is used to cooperate with the end of the threaded pull rod, the bottom end of the pin column body is provided with a hexagonal column, and the outer edge of the bottom end of the pin column body is provided with a second outer tapered end.

[0014] A central cavity is processed at the center of the positioning sleeve, and a screw through hole for passing the threaded pull rod is processed at the center of the central cavity.

[0015] One end of the threaded pull rod is provided with a threaded column, the other end of the threaded column is provided with a positioning collar, the end of the positioning collar is provided with a connecting screw, and the connecting screw is used to form a threaded connection with the central threaded hole of the cylindrical pin.

[0016] The threaded column and the adjusting nut form a threaded transmission fit, and a spare adjusting nut is installed on the threaded column.

[0017] A method for using a positioning pin hole protection device during a parts assembly process comprises the following steps:

[0018] Step 1, fixing the stopper:

[0019] Fix the stopper to the bottom end of the first part by spot welding, and ensure that the center of the stopper is coaxial with the first pin hole on the first part;

[0020] Step 2, installation of lower pin sleeve:

[0021] Insert the lower pin into the first pin hole of the first part;

[0022] Step 3, adjust the position of the lower pin sleeve:

[0023] An adjusting bolt is installed on the stopper, and the position of the lower pin sleeve in the first pin hole is adjusted by rotating the adjusting bolt and tightening the bottom end of the lower pin sleeve, so that the top end of the lower pin sleeve is flush with the center dividing surface between the first part and the second part;

[0024] Step 4, installation of the first and second parts:

[0025] assembling the second part to the first part;

[0026] Step 5, installation of upper pin sleeve:

[0027] Install the upper pin sleeve into the second pin hole of the second part;

[0028] Step 6, installation of cylindrical pins:

[0029] Adjust the positions of the first and second parts, and ensure that the inner holes of the upper and lower pin sleeves are misaligned within 0.2 mm, and then install the cylindrical pins into the upper and lower pin sleeves;

[0030] Step 7, parts processing:

[0031] After the first part and the second part are assembled, the parts are processed to ensure the processing accuracy;

[0032] Step 8, removal of protective device:

[0033] Connect the threaded rod to the end of the cylindrical pin, then pass the positioning sleeve through the threaded rod and position it on the top of the second part. Install the adjusting nut on the threaded rod, turn the adjusting nut to move the cylindrical pin, then pull out the cylindrical pin and remove the upper pin sleeve.

[0034] Then disassemble the first part and the second part in sequence, and after the first part and the second part are disassembled, push out the lower pin sleeve by adjusting the bolt; finally, remove the stopper for next installation and use.

[0035] The utility model has the following beneficial effects:

[0036] 1. Apply the positioning cylindrical pin hole protection device to avoid damage to the positioning cylindrical pin hole mating surface during the parts assembly process, thus eliminating the occurrence of quality problems.

[0037] 2. The application of the positioning cylindrical pin hole protection device improves the efficiency of the positioning cylindrical pin in part assembly and saves assembly time.

[0038] 3. The above-mentioned pin sleeve adjustment mechanism can be used to adjust the installation position of the lower pin sleeve.

[0039] 4. The first threaded hole mentioned above facilitates the cooperation with the adjusting bolt to tighten the lower pin sleeve.

[0040] 5. The upper pin sleeve can be easily matched with the second pin hole on the second part, thereby achieving reliable protection for the second pin hole.

[0041] 6. The lower pin sleeve mentioned above is convenient for matching with the first pin hole on the first part, thereby achieving reliable protection of the first pin hole.

[0042] 7. The cylindrical pin mentioned above is convenient for matching with the first pin hole and the second pin hole, thereby realizing reliable positioning of the first part and the second part.

[0043] 8. The positioning sleeve mentioned above facilitates the matching with the threaded pull rod, thereby facilitating the subsequent removal of the cylindrical pin.

[0044] 9. The threaded pull rod can be used to drive the cylindrical pin to move axially through thread transmission, thereby achieving its removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0047] Figure 2 This is a main sectional view of the positioning sleeve of the present utility model.

[0048] Figure 3 This is a structural diagram of the threaded pull rod of the present utility model.

[0049] Figure 4 This is a main sectional view of the lower pin sleeve of the present utility model.

[0050] Figure 5 This is a main sectional view of the upper pin sleeve of the present utility model.

[0051] Figure 6 This is a matching diagram and a partial enlarged diagram of the cylindrical pin, upper pin sleeve and lower pin sleeve of the utility model.

[0052] Figure 7 This is a structural diagram of a cylindrical pin of the present utility model.

[0053] Figure 8 This is a block structure diagram of the utility model.

[0054] Figure 9 This is a state diagram of the use process of the utility model.

[0055] In the figure: spare adjusting nut 1, adjusting nut 2, positioning sleeve 3, cylindrical pin 4, upper pin sleeve 5, lower pin sleeve 6, stopper 7, adjusting bolt 8, welding point 9, first part 10, center dividing surface 11, second part 12, threaded pull rod 13;

[0056] Screw through hole 301, central cavity 302;

[0057] Second outer tapered end 401, hexagonal prism 402, pin column 403, central threaded hole 404, top stepped hole 405;

[0058] First stepped hole 501, first through hole 502, first outer chamfer 503, first inner chamfer 504;

[0059] A second through hole 601, a second stepped hole 602, a second outer chamfer 603, a first outer tapered end 604, and a third through hole 605;

[0060] Threaded column 1301 , positioning collar 1302 , connecting screw 1303 . DETAILED DESCRIPTION

[0061] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0062] Example 1:

[0063] See also Figure 1-9 A positioning pin hole protection device used in the process of parts assembly includes a lower pin sleeve 6 for matching with a first pin hole on a first part 10, and a pin sleeve adjustment mechanism for adjusting the position of the lower pin sleeve 6 is provided at the bottom end of the first part 10; it also includes an upper pin sleeve 5 for matching with a second pin hole on a second part 12; a cylindrical pin 4 is fitted inside the upper pin sleeve 5 and the lower pin sleeve 6; a positioning sleeve 3 is installed on the top support of the second part 12, and a threaded pull rod 13 is provided inside the positioning sleeve 3, the bottom end of the threaded pull rod 13 is fitted with the top end of the cylindrical pin 4, and the outside of the threaded pull rod 13 is also located at the top end of the positioning sleeve 3 and is fitted with an adjusting nut 2 through a thread. By designing a protective device for the positioning cylindrical pin hole, if the device is used correctly during the parts assembly process, it is possible to prevent the fitting surface of the positioning pin hole from being pulled or squeezed when installing the cylindrical positioning pin, which not only ensures the quality of the fitting surface of the positioning cylindrical pin hole, but also improves the efficiency of installing the cylindrical positioning pin.

[0064] Furthermore, the pin sleeve adjustment mechanism includes a stopper 7, which is fixed to the bottom end of the first part 10 by a welding spot 9 and is coaxial with the first pin hole; an adjusting bolt 8 is installed inside the stopper 7 through threaded transmission, and the top end of the adjusting bolt 8 contacts and cooperates with the bottom end of the lower pin sleeve 6. The above-mentioned pin sleeve adjustment mechanism can be used to adjust the installation position of the lower pin sleeve 6. In the specific adjustment process, the stopper 7 is fixed to the bottom end of the first part 10 by spot welding, and the center of the stopper 7 is ensured to be coaxial with the first pin hole on the first part 10; the adjusting bolt 8 is installed on the stopper 7, and by rotating the adjusting bolt 8 and tightening the bottom end of the lower pin sleeve 6, the position of the lower pin sleeve 6 inside the first pin hole is adjusted, so that the top end of the lower pin sleeve 6 is flush with the center dividing surface 11 of the first part 10 and the second part 12.

[0065] Furthermore, a first threaded hole 701 is processed in the center of the stopper 7 to cooperate with the adjusting bolt 8. The first threaded hole 701 facilitates cooperation with the adjusting bolt 8, thereby tightening the lower pin sleeve 6.

[0066] Furthermore, the center of the upper pin sleeve 5 is machined with a first through-hole 502 for mating with the cylindrical pin 4. The top of the first through-hole 502 is transitioned to a first stepped hole 501. The bottom inner edge of the first through-hole 502 is provided with a first inner chamfer 504, and the bottom outer edge of the first through-hole 502 is provided with a first outer chamfer 503. This upper pin sleeve 5 facilitates mating with the second pin hole on the second component 12, thereby reliably protecting the second pin hole. This facilitates mating with the second pin hole, improving assembly efficiency.

[0067] Furthermore, the center of the lower pin sleeve 6 is machined with a second through-hole 601 for mating with the cylindrical pin 4. The bottom end of the second through-hole 601 is connected to a third through-hole 605. The top end of the second through-hole 601 is connected to a second stepped hole 602. The top outer edge of the second stepped hole 602 is machined with a second outer chamfer 603. The exterior of the lower pin sleeve 6 is machined at the end where the third through-hole 605 is located. This lower pin sleeve 6 facilitates mating with the first pin hole in the first part 10, thereby achieving reliable protection for the first pin hole. This lower pin sleeve 6 also facilitates mating with the first pin hole, improving assembly efficiency.

[0068] Furthermore, the cylindrical pin 4 includes a pin body 403, the top of which is machined with a top stepped hole 405, the center of which is machined with a center threaded hole 404, which is used to mate with the end of the threaded pull rod 13. The bottom of the pin body 403 is provided with a hexagonal prism 402, and the outer edge of the bottom end of the pin body 403 is provided with a second outer tapered end 401. The above-mentioned cylindrical pin 4 facilitates mating with the first pin hole and the second pin hole, thereby achieving reliable positioning of the first part 10 and the second part 12.

[0069] Furthermore, a central cavity 302 is machined in the center of the positioning sleeve 3, and a screw through hole 301 is machined in the center of the central cavity 302 for passing the threaded rod 13. The positioning sleeve 3 is convenient for matching with the threaded rod 13, thereby facilitating the subsequent removal of the cylindrical pin 4.

[0070] Furthermore, one end of the threaded rod 13 is provided with a threaded column 1301, the other end of the threaded column 1301 is provided with a positioning collar 1302, and the end of the positioning collar 1302 is provided with a connecting screw 1303, which is used to form a threaded connection with the central threaded hole 404 of the cylindrical pin 4. The threaded rod 13 facilitates the axial movement of the cylindrical pin 4 through the threaded transmission, thereby achieving its removal.

[0071] Furthermore, the threaded column 1301 and the adjusting nut 2 form a threaded transmission match, and a spare adjusting nut 1 is installed on the threaded column 1301. The adjusting nut 2 is used to facilitate driving the threaded column 1301 to move axially.

[0072] Example 2:

[0073] A method for using a positioning pin hole protection device during a parts assembly process comprises the following steps:

[0074] Step 1, fixing of stopper 7:

[0075] Fix the stopper 7 to the bottom end of the first part 10 by spot welding, and ensure that the center of the stopper 7 is coaxial with the first pin hole on the first part 10;

[0076] Step 2, installation of lower pin sleeve 6:

[0077] Install the lower pin sleeve 6 into the first pin hole of the first part 10;

[0078] Step 3, adjust the position of the lower pin sleeve 6:

[0079] Install the adjusting bolt 8 on the stopper 7. By turning the adjusting bolt 8 and tightening the bottom end of the lower pin sleeve 6, the position of the lower pin sleeve 6 inside the first pin hole is adjusted so that the top end of the lower pin sleeve 6 is flush with the center dividing surface 11 of the first part 10 and the second part 12.

[0080] Step 4, installation of the first part 10 and the second part 12:

[0081] Assembling the second part 12 onto the first part 10;

[0082] Step 5, installation of upper pin sleeve 5:

[0083] Install the upper pin sleeve 5 into the second pin hole of the second part 12;

[0084] Step 6, installation of cylindrical pin 4:

[0085] Adjust the positions of the first part 10 and the second part 12, and ensure that the inner holes of the upper pin sleeve 5 and the lower pin sleeve 6 are misaligned within 0.2 mm, and then install the cylindrical pin 4 into the upper pin sleeve 5 and the lower pin sleeve 6;

[0086] Step 7, parts processing:

[0087] After the first part 10 and the second part 12 are assembled, the parts are processed to ensure the processing accuracy;

[0088] Step 8, removal of protective device:

[0089] Connect the threaded rod 13 to the end of the cylindrical pin 4, then pass the positioning sleeve 3 through the threaded rod 13 and position it on the top of the second part 12. Install the adjusting nut 2 on the threaded rod 13, turn the adjusting nut 2 to move the cylindrical pin 4, and then pull out the cylindrical pin 4, and then remove the upper pin sleeve 5;

[0090] Then disassemble the first part 10 and the second part 12 in sequence. After the first part 10 and the second part 12 are disassembled, push out the lower pin sleeve 6 through the adjusting bolt 8; finally, remove the stopper 7 for next installation and use.

Claims

1. A positioning pin hole protection device used in the process of parts assembly, characterized in that: It comprises a lower pin sleeve (6) for cooperating with a first pin hole on a first part (10), and a pin sleeve adjustment mechanism for adjusting the position of the lower pin sleeve (6) is provided at the bottom end of the first part (10); It also includes an upper pin sleeve (5) for matching with a second pin hole on the second part (12); The upper pin sleeve (5) and the lower pin sleeve (6) are fitted with cylindrical pins (4). The top support of the second part (12) is provided with a positioning sleeve (3), the interior of the positioning sleeve (3) is provided with a threaded pull rod (13), the bottom end of the threaded pull rod (13) is connected with the top end of the cylindrical pin (4), and the outside of the threaded pull rod (13) and the top end of the positioning sleeve (3) are threadedly engaged with an adjusting nut (2).

2. A positioning pin hole protection device for use in a parts assembly process according to claim 1, characterized in that: The pin sleeve adjustment mechanism comprises a stopper (7), which is fixed to the bottom end of the first part (10) via a welding point (9) and is coaxially arranged with the first pin hole; an adjusting bolt (8) is installed inside the stopper (7) via a threaded transmission, and the top end of the adjusting bolt (8) is in contact with the bottom end of the lower pin sleeve (6).

3. A positioning pin hole protection device for use in a parts assembly process according to claim 2, characterized in that: A first threaded hole (701) for cooperating with the adjusting bolt (8) is machined at the center of the stopper (7).

4. The positioning pin hole protection device for use in a parts assembly process according to claim 1, characterized in that: The center of the upper pin sleeve (5) is processed with a first through hole (502) for matching with the cylindrical pin (4), the top transition of the first through hole (502) is provided with a first stepped hole (501), the inner edge of the bottom end of the first through hole (502) is provided with a first inner chamfer (504), and the outer edge of the bottom end of the first through hole (502) is provided with a first outer chamfer (503).

5. The positioning pin hole protection device for use in a parts assembly process according to claim 1, characterized in that: The center of the lower pin sleeve (6) is processed with a second through hole (601) for matching with the cylindrical pin (4), the bottom end of the second through hole (601) is connected to the third through hole (605), the top end of the second through hole (601) is connected to the second stepped hole (602), the top outer edge of the second stepped hole (602) is processed with a second outer chamfer (603), and the outside of the lower pin sleeve (6) and the end located at the third through hole (605) are processed with a first outer tapered end (604).

6. The positioning pin hole protection device for use in a parts assembly process according to claim 1, characterized in that: The cylindrical pin (4) includes a pin column body (403), the top end of the pin column body (403) is processed with a top stepped hole (405), the center of the top stepped hole (405) is processed with a center threaded hole (404), the center threaded hole (404) is used to match with the end of the threaded pull rod (13), the bottom end of the pin column body (403) is provided with a hexagonal column (402), and the outer edge of the bottom end of the pin column body (403) is provided with a second outer tapered end (401).

7. A positioning pin hole protection device for use in a parts assembly process according to claim 6, characterized in that: A central cavity (302) is machined at the center of the positioning sleeve (3), and a screw through hole (301) for passing the threaded pull rod (13) is machined at the center of the central cavity (302).

8. A positioning pin hole protection device for use in a parts assembly process according to claim 7, characterized in that: One end of the threaded pull rod (13) is provided with a threaded column (1301), the other end of the threaded column (1301) is provided with a positioning collar (1302), and the end of the positioning collar (1302) is provided with a connecting screw (1303), which is used to form a threaded connection with the central threaded hole (404) of the cylindrical pin (4).

9. A positioning pin hole protection device for use in a parts assembly process according to claim 8, characterized in that: The threaded column (1301) and the adjusting nut (2) form a threaded transmission fit, and a spare adjusting nut (1) is mounted on the threaded column (1301).

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