Bolt assembly for waveguide tube and microwave transmission device

Abstract

The invention provides a bolt assembly for a waveguide tube and a microwave transmission device, and belongs to the field of fasteners. The bolt assembly comprises a bolt rod, a fastening nut, an anti-loosening nut and an anti-loosening sliding block. The bolt rod and the fastening nut are roughly similar to an existing structure and are mainly used for connecting two parts to be connected. The bolt rod comprises a lead screw and a bolt head arranged at one end of the lead screw, a strip-shaped hole is formed in the lead screw, and the strip-shaped hole extends in the axial direction of the lead screw and penetrates through the lead screw in the radial direction of the lead screw. The anti-loosening sliding block is arranged in the strip-shaped hole and can slide in the axial direction of the lead screw. Locking rods are arranged on the two sides of the anti-loosening sliding block respectively and are of a compressible structure. The locking nut is arranged on the outer side of the fastening nut and used for preventing the fastening nut from loosening, the locking sliding block locks the locking nut through the locking rods on the two sides of the locking sliding block, and therefore the locking nut is prevented from rotating, and the locking effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of fasteners, and more specifically, to a bolt assembly for waveguides and a microwave transmission device. Background Technology

[0002] Microwave plasma equipment typically includes a microwave source, a waveguide transmission assembly, and a discharge cavity. The waveguide transmission assembly, a crucial component connecting the microwave source and the discharge cavity, is generally composed of multiple waveguides connected sequentially; adjacent waveguides are connected by flanges. Because the waveguides require a high degree of tightness in their connections, anti-loosening measures are necessary for the bolts on the flanges. Traditional anti-loosening methods are ineffective in microwave transmission applications. Summary of the Invention

[0003] The purpose of this invention is to provide a bolt assembly for waveguides with good anti-loosening effect.

[0004] Another object of the present invention is to provide a microwave transmission device that employs the above-described bolt assembly.

[0005] This invention is implemented as follows: A bolt assembly includes a bolt shank, a fastening nut, a lock nut, and a lock slider; the fastening nut is threadedly connected to the bolt shank. The bolt rod includes an integrally formed lead screw and a bolt head. A strip pressure plate is provided on both sides of the bolt head. After the bolt assembly is tightened, the strip pressure plate cooperates with the flange plate on the waveguide. The lead screw is provided with a strip-shaped hole, which extends along the axial direction of the lead screw and penetrates the lead screw radially. The anti-loosening slider is disposed in the strip hole and can slide along the axial direction of the lead screw; a locking rod is provided on both sides of the anti-loosening slider, and the locking rod is a compressible structure. The anti-loosening nut is threadedly connected to the lead screw. An annular groove is provided on the inner wall of the threaded hole of the anti-loosening nut. A plurality of evenly distributed locking through holes are provided at the bottom of the annular groove. The locking through holes extend radially along the anti-loosening nut. The end of the locking rod can extend into the corresponding locking through hole and can retract into the annular groove under the action of external force.

[0006] Furthermore, in its natural state, one end of the strip pressure plate is connected to the bolt head, and the other end is set at an acute angle to the lead screw; when the bolt assembly is engaged with the flange plate, the strip pressure plate can apply elastic pressure to the flange plate.

[0007] Furthermore, the bolt assembly also includes a snap-fit ​​component, which includes an annular plate and two snap-fit ​​plates; the annular plate is sleeved on the lead screw, and the two snap-fit ​​plates are arranged perpendicularly to the annular plate and are capable of locking the bolt head; the two strip plates are fixedly connected to the annular plate.

[0008] Furthermore, the end of the locking rod is hemispherical, and the locking through hole is a stepped hole, including a large-diameter hole and a small-diameter hole. The large-diameter hole is located inside the anti-loosening nut. The depth of the large-diameter hole is less than the radius of the end of the locking rod, so that when the anti-loosening nut is rotated under the action of a wrench, the end of the locking rod can retract into the annular groove.

[0009] Furthermore, a spring washer is provided between the anti-loosening nut and the fastening nut.

[0010] Furthermore, the threaded hole of the lock nut has a flared end near the fastening nut.

[0011] Furthermore, the locking rod includes a sleeve, a plug rod, and a compression spring. The end of the sleeve is fixedly connected to the anti-loosening slider. One end of the plug rod is hemispherical, and the other end is slidably inserted into the sleeve. The compression spring is disposed in the sleeve, and its two ends are respectively connected to the sleeve and the plug rod.

[0012] Furthermore, the anti-loosening slider has a cuboid block structure.

[0013] Furthermore, the lead screw is provided with a guide hole in the axial direction, the guide hole is connected to the strip hole, a guide rod is provided in the guide hole, and the guide rod is detachably connected to the anti-loosening slider.

[0014] A microwave transmission device includes a plurality of waveguides, adjacent waveguides being connected by flanges, the flanges being connected by the bolt assembly.

[0015] The beneficial effects of this invention are: The bolt assembly and microwave transmission device for waveguides obtained by the above design are as follows: In use, after tightening the fastening nut to the preset position, the anti-loosening nut is screwed onto the threaded rod, and the anti-loosening slider is inserted into the slotted hole. The anti-loosening nut is then tightened until it firmly abuts against the fastening nut. At this point, under the stopping action of the anti-loosening slider, the anti-loosening nut cannot rotate away from the bolt head, thus applying continuous axial pressure to the fastening nut. This maintains a relatively large frictional force between the fastening nut and the bolt thread, preventing the anti-loosening nut from rotating under vibration, thereby achieving the anti-loosening effect. The slotted plates on both sides of the bolt head can be either rigid or elastic, both of which can apply pressure to the flange plate near the bolt, thereby improving the sealing effect. In addition, when tightening the locking nut or anti-loosening nut, in order to prevent the bolt rod from rotating, it is generally necessary to use another tool to fix the bolt head. However, with the two strip plates, if the bolt rod rotates, one of the two strip plates can abut against the side wall of the waveguide, thereby restricting the rotation of the bolt rod. At this time, there is no need to use another tool to fix the bolt head, making the operation more convenient. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the bolt assembly provided by the present invention; Figure 2 This is an assembly diagram of the bolt rod, anti-loosening slider, and locking rod provided by the present invention; Figure 3 This is a schematic diagram of the anti-loosening nut provided by the present invention; Figure 4 This is a cross-sectional view of the anti-loosening nut provided by the present invention; Figure 5 This is a cross-sectional view of the bolt assembly provided in Embodiment 3 of the present invention; Figure 6 This is provided in Embodiment 3 of the present invention. Figure 5 Top view.

[0018] Icons: 1- Bolt assembly; 11- Fastening nut; 12- Bolt shank; 121- Strip hole; 122- Strip pressure plate; 13- Locking nut; 131- Annular groove; 132- Locking through hole; 1321- Large diameter hole; 1322- Small diameter hole; 14- Locking slider; 15- Locking rod; 16- Spring washer; 170- Snap-fit ​​component; 171- Annular plate; 172- Snap-fit ​​plate. Detailed Implementation Example 1:

[0019] Please refer to Figures 1-3 This embodiment provides a bolt assembly 1 for a waveguide (not shown in the figure), which includes a bolt rod 12, a fastening nut 11, a lock nut 13, and a lock slider 14. The bolt rod 12 and the fastening nut 11 are similar to existing structures and are mainly used to connect two components to be connected. The lock nut 13 is located on the outside of the fastening nut 11 to prevent the fastening nut 11 from loosening. The lock slider 14 locks the lock nut 13 through locking rods 15 on both sides, thereby preventing the lock nut 13 from rotating and achieving the effect of preventing loosening.

[0020] The aforementioned fastening nut 11 can be a standard component. The bolt rod 12 includes a lead screw and a bolt head at one end of the lead screw. A slotted hole 121 is provided on the lead screw, extending axially and penetrating radially through it. The anti-loosening slider 14 is a cuboid block structure, positioned within the slotted hole 121, and capable of sliding axially along the lead screw. Locking rods 15 are provided on both sides of the anti-loosening slider 14. These locking rods 15 are compressible and extend radially along the lead screw.

[0021] In addition, strip-shaped pressure plates 122 are respectively provided on both sides of the bolt head. After the bolt assembly is tightened onto the flange plate (not shown in the figure), the strip-shaped pressure plates 122 cooperate with the flange plate on the waveguide. In this embodiment, the strip-shaped pressure plates 122 are elastic plates, and the strip-shaped pressure plates 122 are fixedly connected to the bolt head. In the natural state, one end of the strip-shaped pressure plate 122 is connected to the bolt head, and the other end is set at an acute angle to the lead screw. When the bolt assembly is cooperated with the flange plate, the strip-shaped pressure plate deforms to fit against the flange plate, which can apply elastic pressure to the flange plate. This can improve the sealing performance of the flange plate connection on the one hand, and improve the anti-loosening effect by applying continuous elastic force to the bolt rod 12 on the other hand. In addition, when tightening the fastening nut or anti-loosening nut, in order to prevent the bolt rod from rotating, it is generally necessary to use another tool to fix the bolt head. However, with two strip-shaped plates, if the bolt rod rotates, one of the two strip-shaped plates can abut against the side wall of the waveguide, thereby restricting the rotation of the bolt rod. At this time, it is not necessary to use another tool to fix the bolt head, making the operation more convenient.

[0022] The anti-loosening nut 13 is similar to a standard nut in general, except that it has an annular groove 131 on the inner wall of its threaded hole, which is coaxial with the anti-loosening nut 13. Multiple evenly distributed locking through holes 132 are provided at the bottom of the annular groove 131, extending radially along the anti-loosening nut 13. After the locking rods 15 on both sides of the anti-loosening slider 14 extend into the corresponding locking through holes 132, the anti-loosening nut 13 cannot disengage from the locking rods 15 under vibration, thus preventing it from rotating.

[0023] The locking lever 15 includes a sleeve, a connecting rod, and a compression spring. The end of the sleeve is fixedly connected to the anti-loosening slider 14. One end of the connecting rod is hemispherical, and the other end is slidably inserted into the sleeve. The compression spring is disposed within the sleeve, with both ends connected to the sleeve and the connecting rod respectively, thus making the lever a compressible structure.

[0024] In specific operation, first tighten the fastening nut 11 to the preset position, and then tighten the anti-loosening nut 13 onto the lead screw. Next, insert the anti-loosening slider 14 into the slotted hole 121. Then, insert the end of one of the locking rods 15 into the locking through hole 132. Use an external tool to compress the locking rod 15 and adjust the tilt angle of the locking rod 15 and the anti-loosening slider 14, so that both locking rods 15 extend into their corresponding locking through holes 132. At this point, because the locking rod 15 extends into the corresponding locking through hole 132, it locks the anti-loosening nut 13, preventing it from rotating, thus achieving anti-loosening of the entire bolt assembly 1. When it is necessary to remove the anti-loosening nut 13, use a rod-shaped tool to compress the locking rod 15 through the locking through hole 132, and then adjust the angle of the shortened locking rod 15 to disengage it from the annular groove 131.

[0025] Furthermore, a spring washer 16 is provided between the anti-loosening nut 13 and the fastening nut 11; thus, the precise matching of the locking rod 15 and the locking through hole 132 can be achieved by adjusting the thickness of the spring washer 16. That is, if there is a deviation between the position of the locking rod 15 and the locking through hole 132, the anti-loosening nut 13 can be rotated appropriately. At this time, the abutment force of the anti-loosening nut 13 against the fastening nut 11 will not be affected, and the locking rod 15 can be accurately inserted into the locking through hole 132 to achieve the purpose of locking the anti-loosening nut 13. Example 2:

[0026] This embodiment provides another bolt assembly 1, which differs from embodiment 1 in that, after the locking rod 15 is installed into the anti-loosening through hole, if it is necessary to continue tightening the anti-loosening nut 13, the anti-loosening nut 13 can be turned with a wrench without removing the locking rod 15.

[0027] Specifically, the end of the locking rod 15 is hemispherical, and the locking through hole 132 adopts a stepped hole, which includes a coaxial large-diameter hole 1321 and a small-diameter hole 1322. The large-diameter hole is located inside the lock nut 13; the depth of the large-diameter hole is less than the radius of the end of the locking rod 15, so that only part of the hemispherical end of the locking rod 15 is located in the large-diameter hole; thus, when the lock nut 13 is rotated under the action of a wrench, the end of the locking rod 15 can retract into the annular groove 131. The above design makes it easier to operate by simply turning the lock nut 13 without disassembling the locking rod 15.

[0028] Furthermore, such as Figure 4 The threaded hole of the anti-loosening nut 13 is flared at the end near the fastening nut, and the inner wall of the flared hole does not need to be threaded; that is, the threaded hole is conical at the end near the fastening nut 11, which makes the outer diameter of the threaded hole larger.

[0029] The above design makes the assembly of the locking rod 15 more convenient. When the locking rod 15 needs to be assembled, the anti-loosening slider 14 and the locking rod 15 can be directly inserted into the slot 121 first, and then the anti-loosening nut 13 can be rotated. When the end of the locking rod 15 touches the inner wall of the flared opening, continue to rotate the anti-loosening nut 13. At this time, the locking rod 15 will automatically shorten under the pressure of the inner wall of the flared opening until the locking rod 15 is installed in the annular groove 131. It should be noted that the multiple locking through holes 132 are generally arranged symmetrically to facilitate the locking of two symmetrical locking rods 15. Example 3:

[0030] Please refer to Figure 5 and Figure 6 This embodiment provides another bolt assembly, which differs from Embodiment 1 in that the bolt assembly is further provided with a snap-fit ​​member 170, and the strip pressure plate 122 is directly integrally formed with the snap-fit ​​member 170; the snap-fit ​​member 170 is detachably connected to the bolt rod 12.

[0031] Specifically, the snap-fit ​​component 170 includes an annular plate 171 and two snap-fit ​​plates 172, which are symmetrically arranged and perpendicular to the annular plate 171. The two snap-fit ​​plates 172 are used to hold the bolt head in place. The annular plate 171 is fitted onto the lead screw. The strip pressure plate 122 and the snap-fit ​​plates 172 extend toward both sides of the annular plate, respectively.

[0032] In this embodiment, the strip pressure plate 122 and the snap-fit ​​member 170 are integrally formed, and the bolt head is snapped in place by the two snap-fit ​​plates 172; this can improve the anti-loosening effect of the bolt assembly. The strip pressure plate 122 does not need to be connected to the bolt head, but is connected to the bolt rod by means of the snap-fit ​​member 170, which makes the operation more convenient.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A bolt assembly for a waveguide, characterized in that, It includes a bolt rod, a fastening nut, a lock nut, and a lock slider; the fastening nut is threadedly connected to the bolt rod; The bolt rod includes an integrally formed lead screw and a bolt head. A strip pressure plate is provided on both sides of the bolt head. After the bolt assembly is tightened, the strip pressure plate cooperates with the flange plate on the waveguide. The lead screw is provided with a strip-shaped hole, which extends along the axial direction of the lead screw and penetrates the lead screw radially. The anti-loosening slider is disposed in the strip hole and can slide along the axial direction of the lead screw; a locking rod is provided on both sides of the anti-loosening slider, and the locking rod is a compressible structure. The anti-loosening nut is threadedly connected to the lead screw. An annular groove is provided on the inner wall of the threaded hole of the anti-loosening nut. A plurality of evenly distributed locking through holes are provided at the bottom of the annular groove. The locking through holes extend radially along the anti-loosening nut. The end of the locking rod can extend into the corresponding locking through hole and can retract into the annular groove under the action of external force.

2. A bolt assembly for a waveguide according to claim 1, characterized in that: In its natural state, one end of the strip pressure plate is connected to the bolt head, and the other end is set at an acute angle to the lead screw; when the bolt assembly is engaged with the flange plate, the strip pressure plate can apply elastic pressure to the flange plate.

3. A bolt assembly for a waveguide according to claim 1, characterized in that: The bolt assembly further includes a snap-fit ​​component, which includes an annular plate and two snap-fit ​​plates; the annular plate is sleeved on the lead screw, and the two snap-fit ​​plates are arranged perpendicularly to the annular plate and are capable of locking the bolt head; the strip pressure plate is fixedly connected to the annular plate.

4. A bolt assembly for a waveguide according to claim 1, characterized in that: The end of the locking rod is hemispherical, and the locking through hole is a stepped hole, including a large-diameter hole and a small-diameter hole. The large-diameter hole is located inside the anti-loosening nut. The depth of the large-diameter hole is less than the radius of the end of the locking rod, so that when the anti-loosening nut is rotated under the action of a wrench, the end of the locking rod can retract into the annular groove.

5. A bolt assembly for a waveguide according to claim 4, characterized in that: The threaded hole of the lock nut has a flared end near the fastening nut.

6. A bolt assembly for a waveguide according to claim 1, characterized in that: A spring washer is provided between the anti-loosening nut and the fastening nut.

7. A bolt assembly for a waveguide according to claim 1, characterized in that: The locking rod includes a sleeve, a plug rod, and a compression spring. The end of the sleeve is fixedly connected to the anti-loosening slider. One end of the plug rod is hemispherical, and the other end is slidably inserted into the sleeve. The compression spring is disposed in the sleeve, and its two ends are respectively connected to the sleeve and the plug rod.

8. A bolt assembly for a waveguide according to claim 1, characterized in that: The anti-loosening slider has a rectangular block structure.

9. A bolt assembly for a waveguide according to claim 1, characterized in that: The lead screw has a guide hole in its axial direction, which communicates with the strip hole. A guide rod is installed inside the guide hole, and the guide rod is detachably connected to the anti-loosening slider.

10. A microwave transmission device, characterized in that, The microwave transmission device includes multiple waveguides, adjacent waveguides are connected by flanges, and the flanges are connected by bolt assemblies as described in any one of claims 1-9.

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