CN207728710U - A kind of railway vehicle air conditioner cover board anticreep fastening assembly - Google Patents

Abstract

The utility model provides a detachment-preventing fastening assembly for rail vehicle air-conditioning cover plates, which belongs to the technical field of rail vehicle air-conditioning. The key is that the bolts pass through the air-conditioning cover and add a retaining ring; the upper part of the inner surface of the nut is a smooth surface, and the lower part is a thread, and the bolt is separated from the air-conditioning cover. The threaded portion of the nut is limited on the air-conditioning cover plate by means of the retaining ring to form an anti-off structure. The beneficial effects are: the provided anti-detachment fastening assembly for the rail vehicle air-conditioning cover plate has a simple structure and ingenious design, which avoids the bolts falling off when the air-conditioning cover plate is disassembled, saves manpower, and greatly improves work efficiency; further improved technical solutions Among them, the standard parts of bolts and retaining rings are mostly used, which are convenient for replacement and large-scale application; the self-made nuts are matched with the standard parts of bolts, which is convenient for standardized manufacturing and has good versatility.

Description

An anti-detachment fastening assembly for rail vehicle air-conditioning cover plate

technical field

The utility model relates to the technical field of rail vehicle air conditioners, in particular to an anti-detachment fastening assembly for rail vehicle air conditioner cover plates.

Background technique

Rail vehicle air-conditioning units are often equipped with multiple inspection covers for easy maintenance. The inspection covers are installed on the box body through fasteners. The fasteners used are usually screws or bolts. The most commonly used national standard M6 or M8 is used for fastening. However, since the fasteners themselves do not have the function of preventing falling out, during the maintenance process of removing the cover plate, the cover plate bolts and their matching flat washers and spring washers are very likely to fall off or be lost, and need to be picked up manually. However, due to the weak magnetism of the tool, a large part of it cannot be sucked up. Therefore, maintenance interruption, waste of manpower or material resources, etc. are caused; in addition, the bolts need to be reassembled when the cover plate is installed after maintenance. , Spring washers and flat washers. For air-conditioning units that include more fasteners, only installing fasteners will take a long time and a large workload, resulting in low work efficiency. The above problems have brought a lot of inconvenience to the maintenance, disassembly and installation of the air-conditioning unit, and are in urgent need of improvement.

Contents of the invention

In order to solve the technical problems that the fasteners of the air conditioner cover plate are easy to fall off, consume manpower, and have low maintenance efficiency, the utility model provides an anti-detachment fastening assembly for the air conditioner cover plate of rail vehicles. The retaining ring, and the technical scheme of transforming the inner upper part of the matching nut into a smooth surface, realizes that after the bolt is separated from the threaded part of the nut, it is still limited on the air conditioner cover plate, avoiding loosening and falling, saving manpower and improving Maintenance efficiency.

The technical scheme adopted by the utility model is: an anti-loosening fastening assembly for the air-conditioning cover plate of a rail vehicle, including a nut positioned on the box body and a bolt that passes through the air-conditioning cover plate and cooperates with the nut. After passing through the air-conditioning cover plate, a retaining ring is added; the upper part of the inner surface of the nut is a smooth surface, and the lower part is threaded.

Preferably, the retaining ring is an elastic retaining ring.

Preferably, the retaining ring is a Torx ring.

Further, the bolt is provided with a shoulder, above the shoulder is a smooth surface, and below the shoulder is provided with an external thread; the distance L1 between the shoulder and the lower end surface of the retaining ring is greater than the length L2 below the shoulder, and the distance below the shoulder is The length L2 is less than the distance L3 between the upper end surface of the threaded part on the inner surface of the nut and the lower end surface of the retaining ring.

After the bolt is fastened with the inner threaded surface of the nut, it is not less than 3 buckles.

The bolt passes through the spring washer, the flat washer, the air conditioner cover plate and the retaining ring in turn to cooperate with the nut.

The depth of the nut is greater than the length of the bolt - the thickness of the spring washer - the thickness of the flat washer - the thickness of the air conditioner cover plate - the thickness of the retaining ring.

The nut is welded and positioned in the box.

Welding grooves are machined on both sides of the upper end of the nut or along the circumferential direction.

In the above technical solution, a detachment-preventing fastening assembly for the air-conditioning cover plate of a rail vehicle includes a nut positioned on the box body and a bolt that passes through the air-conditioning cover plate and cooperates with the nut. The key design of the utility model is that the bolt A retaining ring is added after passing through the air-conditioning cover plate, among which bolts, retaining rings, etc. can be used as standard parts; the nuts are machine-made nuts, which are characterized in that the upper part of the inner surface is a smooth surface and the lower part is a threaded part, and the bolts are tightened to achieve For the installation of the air conditioner cover plate, when the bolt is loosened and withdrawn, as the bolt moves upward to the threaded part away from the nut, the end of the bolt is in the smooth surface area of the upper middle part of the nut hole. At this time, the air conditioner cover plate can be separated from the box body, and the retaining ring Position the bolts on the air conditioner cover to prevent the bolts from coming off.

The beneficial effects of the utility model are: the detachment-preventing fastening assembly for the rail vehicle air-conditioning cover plate provided by the utility model has a simple structure and ingenious design, which avoids the bolts falling off when the air-conditioning cover plate is disassembled, saves manpower, and greatly improves the working efficiency. Efficiency; In the further improved technical scheme, the standard parts of bolts and retaining rings are mostly used, which are convenient for replacement and large-scale application; the self-made nuts are matched with standard bolts, which is convenient for standardized manufacturing and has good versatility.

Description of drawings

Fig. 1 is a structural schematic diagram of the retaining ring of the fastening assembly in embodiment 1 of the present invention being fitted on the bolt;

Fig. 2 is the structure schematic diagram of the structure of the bolt in the fastening assembly of embodiment 2 and its assembly on the air-conditioning cover plate;

Fig. 3 is a structural schematic diagram of the fastening assembly of embodiment 2 after installation;

Fig. 4 is a structural schematic diagram when the fastening assembly of embodiment 2 is removed;

Fig. 5 is the structural representation of M6 nut among the embodiment 3;

Fig. 6 is the structural representation of M8 nut among the embodiment 3;

Among them, 1, bolt, 1-1, shaft shoulder, 2, spring washer, 3, flat washer, 4, air conditioner cover plate, 5, retaining ring, 6, box body, 7, nut, 7-1, welding groove.

L1 represents the distance between the shaft shoulder 1-1 and the lower end surface of the retaining ring 5; L2 represents the length below the shoulder 1-1 of the bolt 1;

Detailed ways

The following is a detailed description of the structure and application method of the anti-loosening fastening assembly for the rail vehicle air-conditioning cover plate provided by the utility model with specific examples, but does not limit the protection scope of the utility model in any form. All the improvements, modifications or similar replacements should be included in the protection scope of the present utility model.

Example 1

This embodiment provides an anti-loosening fastening assembly for a rail vehicle air-conditioning cover plate. Referring to FIG. Welded on the box body 6, the bolt 1 passes through the air conditioner cover plate 4 and is connected with the nut 7 to install the air conditioner cover plate 4 to the box body 6, in order to avoid the bolt 1 from falling off when the air conditioner cover plate 4 is removed, pass the bolt 1 through Behind the air-conditioning cover plate 4, a retaining ring 5 is added. In this embodiment, the bolt 1 is fully threaded or half-threaded (the upper part is a smooth surface, and the lower part is provided with external threads), and the retaining ring 5 is an elastic retaining ring with an inner diameter slightly smaller than that of the bolt 1. The outer diameter is set on the outside of the bolt 1; the nut 7 is a special nut, the upper part of the inner surface is a smooth surface, and the lower part is provided with a thread, which is a threaded part. When the air-conditioning cover 4 is removed, the bolt 1 is loosened until it is separated from the nut 7 At this time, the bolt 1 and the nut 7 have no cooperative effect, the end of the bolt 1 is in the upper smooth surface area of the nut 7 hole, the air conditioner cover 4 can be separated from the box body 6, and the retaining ring 5 limits the bolt 1 to the On the air-conditioning cover plate 4, an anti-off structure is formed. The difference between the nut 7 and the existing common nut that cooperates with the bolt 1 is that the top of the inner surface is transformed into a smooth surface, the diameter is greater than the outer diameter of the threaded portion, and the smooth surface and the threaded portion are connected by chamfering or right angles.

In order to make the cooperation between the bolt 1 and the nut 7 stable and firm, the inside thread surface of the bolt 1 and the nut 7 should be fastened by no less than 3 buckles.

Example 2

This embodiment provides an anti-loosening fastening assembly for a rail vehicle air-conditioning cover plate, as shown in Figure 2-4, the anti-loosening fastening assembly includes a bolt 1 and a nut 7 matched with it, and the nut 7 is welded in the box body 6, The bolt 1 passes through the spring washer 2, the flat washer 3, the air conditioner cover 4 and the nut 7 in order to closely install the air conditioner cover 4 on the box body 6. In order to prevent the bolt 1 from falling off when the air conditioner cover 4 is removed, put the After the bolt 1 passes through the air-conditioning cover plate 4, a retaining ring 5 is added. In this embodiment, the bolt 1 is provided with a shaft shoulder 1-1, and the surface above the shaft shoulder 1-1 is smooth without thread; the shaft shoulder 1- 1 is provided with an external thread to form a thread fit with the nut 7; the diameter above the shoulder 1-1 is smaller than the outer diameter of the external thread portion below the shoulder 1-1. The retaining ring 5 is a torx hole retaining ring. When the bolt 1 is installed through it, it is simple and convenient. When withdrawing, the torx hole retaining ring blocks the shaft shoulder 1-1 with the help of the tooth structure, forming a one-way limit for the bolt 1, and the torx hole The retaining ring is a standard part with good versatility. See Figure 3 after the fastening assembly is installed. The difference between nut 7 and ordinary nuts is that the upper part of the inner surface is transformed into a smooth surface, the diameter is greater than the outer diameter of the threaded part, and the smooth surface and the threaded part are connected by chamfering or right angles.

When the bolt 1 is loosened and withdraws upwards away from the nut 7 until the shaft shoulder 1-1 touches the retaining ring 5, as shown in Figure 4, in order to ensure that the bolt 1 and the nut 7 are not threaded, the shaft shoulder 1-1 is 5 times away from the retaining ring The distance L1 of the end surface is greater than the length L2 below the shaft shoulder 1-1, and the length L2 below the shaft shoulder 1-1 is smaller than the distance L3 between the upper end surface of the threaded part on the inner surface of the nut 7 and the lower end surface of the retaining ring 5. At this time, The bolt 1 and the nut 7 have no cooperative effect, the air conditioner cover plate 4 can be separated from the box body 6, and the retaining ring 5 limits the bolt 1 on the air conditioner cover plate 4 to form an anti-loosening structure.

In order to make the cooperation between the bolt 1 and the nut 7 stable and firm, the inside thread surface of the bolt 1 and the nut 7 should be fastened by no less than 3 buckles.

In order to ensure the connection stability of the air-conditioning cover plate 4, the depth of the nut 7 is greater than the length of the bolt 1-the thickness of the elastic washer 2-the thickness of the flat washer 3-the thickness of the air-conditioning cover plate 4-the thickness of the retaining ring 5.

Example 3

On the basis of Embodiment 2, the bolts, spring washers, flat washers, and retaining rings in this embodiment are all standard parts, such as the bolt 1 of the model GBT838_M6X20, the spring washer 2 of GB93-87-6, and the GB96-85-6 The flat washer 3, the retaining ring 5 of SW3DPS-12-6-1 and the machined M6 nut 7 with composite requirements (see Figure 5). It is used to fit the thread of GBT838_M6X20 bolt 1, and the height of the thread part can be 8mm to ensure that the thread fits more than 3 threads; the upper part of the hole of the nut 7 is a smooth surface, and the diameter of the hole is larger than the outer diameter of the thread part of the GBT838_M6X20 bolt (6mm), such as the diameter The height of the smooth surface can be set to 9.5mm, which is higher than the length of the bolt 1 shaft shoulder 1-1 (the length of the threaded part); in order to facilitate welding, the upper end of the nut 7 is machined with a welding groove 7- 1. The welding groove 7-1 can refer to the example structure in Figure 5. The depth of the groove is equivalent to the thickness of the top plate of the box body 6. Put the nut 7 into the reserved mounting hole on the box body 6 from below, and then weld and position it.

If the bolt 1 of the model GBT838_M8X25 is selected, the spring washer 2 of GB93-87-8, the flat washer 3 of GB96-85-8, the retaining ring 5 of SW3DPS-17-6-1 and the M8 nut of the composite requirement of machining are selected as matching 7 (see Figure 6 for the nut structure), the upper part of the hole of the nut 7 is a smooth surface, and the diameter of the hole is larger than the outer diameter (8mm) of the GBT838_M8X25 bolt thread. If the diameter is 10mm, the height of the smooth surface can be set to 12.5mm, which is The length below the shoulder 1-1 of the bolt 1 (the length of the threaded part); for the convenience of welding, the nut 7 is machined along the circumferential direction to form a welding groove 7-1, and the welding groove 7-1 can refer to the example structure of Figure 6, Insert the nut 7 into the mounting hole reserved on the box body 6 from above, and then weld and position it.

Most of the standard parts are used in this embodiment, which has good versatility and is convenient for popularization and use.

It can be seen from the above embodiments that the detachment-preventing fastening assembly for rail vehicle air-conditioning cover plate provided by the utility model has a simple structure, is easy to manufacture, and is convenient to use, and avoids falling off or loss of fasteners caused by disassembling the cover plate during the maintenance process of the air-conditioning unit; The maintenance time of the air conditioning unit is shortened, and the work efficiency is improved.

Claims (9)

1. a kind of railway vehicle air conditioner cover board anticreep fastening assembly, including it is located in babinet（6）On nut（7）With across sky Adjust cover board（4）With nut（7）The bolt of cooperation（1）, which is characterized in that the bolt（1）Across air-conditioning cover board（4）After add gear Circle（5）；The nut（7）Inner surface top is shiny surface, lower part is screw thread, the bolt（1）It is detached from nut（7）Screw thread By baffle ring when portion（5）Limit is in air-conditioning cover board（4）On, form disconnecting prevention structure.

2. anticreep fastening assembly according to claim 1, which is characterized in that the baffle ring（5）For circlip.

3. anticreep fastening assembly according to claim 1, which is characterized in that the baffle ring（5）For plum blossom hole baffle ring.

4. anticreep fastening assembly according to claim 1, which is characterized in that the bolt（1）Equipped with the shaft shoulder（1-1）, axis Shoulder（1-1）It is smooth surface, the shaft shoulder above（1-1）To divide into external screw thread；The shaft shoulder（1-1）Away from baffle ring（5）Lower face away from It is more than the shaft shoulder from L1（1-1）Length L2 below, the shaft shoulder（1-1）Length L2 below is less than the nut（7）Threaded portion Upper surface is away from baffle ring（5）The distance L3 of lower face.

5. anticreep fastening assembly according to claim 1, which is characterized in that the bolt（1）With nut（7）Inside thread No less than 3 buttons after the cooperation fastening of face.

6. anticreep fastening assembly according to claim 1, which is characterized in that the bolt（1）Sequentially pass through spring washer（2）、 Plain cushion（3）, air-conditioning cover board（4）And baffle ring（5）With nut（7）Cooperation.

7. anticreep fastening assembly according to claim 6, which is characterized in that the nut（7）Depth is more than bolt（1）It is long Degree-spring washer（2）Thickness-plain cushion（3）Thickness-air-conditioning cover board（4）Thickness-baffle ring（5）Thickness.

8. anticreep fastening assembly according to claim 1, which is characterized in that the nut（7）Welding is located in babinet（6） It is interior.

9. the anticreep fastening assembly according to claim 1 or 8, which is characterized in that the nut（7）Upper end both sides or along week To being machined with welding groove（7-1）.