Non-contact waveguide short-circuiter

Abstract

The invention discloses a non-contact waveguide short-circuiting device which comprises a piston body and a round waveguide tube, a short-circuiting surface is formed at one end of the piston body, the other end of the piston body is inserted into the round waveguide tube through one end of the round waveguide tube, and a gap is formed between the outer wall surface of the piston body and the inner wall surface of the round waveguide tube; the piston body is connected with tuning equipment, and the tuning equipment can drive the piston body to horizontally move in the circular waveguide tube, so that the position of the short circuit surface relative to the circular waveguide tube is adjusted. The piston body and the circular waveguide tube are not in direct contact to form a non-contact waveguide short-circuiting device, so that the movement of the piston body in the circular waveguide tube is not limited, the accurate control of the position of the piston body is easy to realize, the piston body is not worn, in addition, tuning equipment can adjust the insertion depth of the short-circuit surface in the circular waveguide synthesizer, and the tuning efficiency is improved. Therefore, the position of the short-circuit surface in the waveguide cavity can be adjusted conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of waveguide short - circuit breakers, and particularly to a non - contact waveguide short - circuit breaker. Background Art

[0002] A waveguide short - circuit breaker is a component in a microwave system, and its main function is to reflect all electromagnetic energy back. It is also known as a short - circuit load or a total reflection terminator. Waveguide short - circuit breakers are divided into two categories: contact type and non - contact type.

[0003] In a contact short - circuit breaker, elastic sheets with cut grooves on two wide sides of the short - circuit piston end block and forming many fine claws, such as phosphor bronze, beryllium bronze, high - quality elastic steel sheets plated with silver or copper, etc., are used to make the contact closer. In a non - contact short - circuit breaker, there is a very small gap between the outer surface of the piston and the waveguide. The characteristic impedance is Z′c, and the characteristic impedance of the original coaxial line is Zc. According to the transmission line theory, if Z′c << Zc, then the impedance presented at the equivalent short - circuit surface is very small, approximately equal to a short - circuit.

[0004] In a high - power waveguide synthesizer, a multi - path high - power waveguide synthesizer synthesizes the power generated by multiple solid - state power transmitting components. The synthesized high - power is output to a coaxial line device and then coupled and converted to an output waveguide. A waveguide short - circuit breaker is the most basic tuning element in the waveguide. By changing the position of the piston body, the resonant frequency of the waveguide cavity or the entire microwave system can be changed to achieve matching or tuning functions. The standing - wave ratio at the input end is about 100 - 170, so that the transmission line is approximately in a short - circuit state.

[0005] However, in the prior art, a planar reflector is usually used as a waveguide short - circuit breaker, and the reflecting surface in the planar reflector is in full - contact with the inner wall of the waveguide cavity, that is, the reflecting surface contacts the inner wall of the waveguide cavity. This contact causes friction during the movement of the reflecting surface, which will lead to wear of the reflecting surface. This wear will not only cause a change in the area of the reflecting surface, but also make the moving position of the reflecting surface unable to be accurately controlled.

[0006] Therefore, the above - mentioned prior art has at least the following technical problems: The waveguide short - circuit surface of the waveguide short - circuit breaker in the prior art is prone to wear and the position cannot be accurately controlled. Summary of the Invention

[0007] By providing a non - contact waveguide short - circuit breaker in an embodiment of the present application, the technical problems that the waveguide short - circuit surface of the waveguide short - circuit breaker in the prior art is prone to wear and the position cannot be accurately controlled are solved.

[0008] In order to solve the above technical problems, the embodiment of the present application provides a non-contact waveguide short circuit device, including a piston body and a circular waveguide tube, one end of the piston body is formed with a short-circuit surface, the other end of the piston body is inserted into the circular waveguide tube through one end of the circular waveguide tube, and there is a gap between the outer wall surface of the piston body and the inner wall surface of the circular waveguide tube;

[0009] The piston body is connected to a tuning device, and the tuning device can drive the piston body to move horizontally in the circular waveguide tube, so as to adjust the position of the short-circuit surface relative to the circular waveguide tube.

[0010] Furthermore, an insulating support is provided between the outer wall surface of the piston body and the inner wall surface of the circular waveguide tube, one side of the insulating support is fixed on the outer wall surface of the piston body, and the other side is in contact with the inner wall surface of the circular waveguide tube.

[0011] Furthermore, the other end of the circular waveguide tube is provided with an end cap, and the insulator can horizontally move through the end cap;

[0012] One end of the insulator located inside the circular waveguide is connected to the piston body, and one end of the insulator located outside the circular waveguide is connected to the tuning device, and the tuning device drives the piston body to move horizontally through the insulator;

[0013] Wherein, the insulator is made of insulating material, and the insulator is not in contact with the end cover.

[0014] Furthermore, the tuning device comprises a fixed adjustment platform, on which a lead screw extending in a horizontal direction can be rotatably passed, a slide plate is engaged with the lead screw, and the insulator is fixed on the slide plate;

[0015] When the lead screw rotates, it drives the slide plate to move horizontally, thereby driving the piston body to move horizontally.

[0016] Furthermore, one end of the lead screw is connected to a crank handle for driving the lead screw to rotate.

[0017] Furthermore, the adjustment platform is provided with a length scale extending along the length direction of the lead screw, and the slide plate is provided with an indication mark for indicating the length scale, and the indication mark and the length scale are used to indicate the horizontal movement distance of the slide plate.

[0018] Furthermore, both sides of the slide plate can be slidably inserted into the slide rod, and the slide rod is respectively fixedly arranged on both sides of the lead screw and parallel to the lead screw. When the lead screw drives the slide plate to move horizontally, the slide plate slides on the slide rod.

[0019] Furthermore, the piston body is hollow inside, and the other end of the piston body is open, a connecting seat is provided on the inner surface of the short-circuit path, and the insulator passing through the end cover enters the piston body through the opening of the piston body and is connected to the connecting seat, thereby being connected to the piston body;

[0020] The connecting seat is provided with a cooling cavity and a first liquid inlet pipe and a first liquid discharge pipe respectively connected with the cooling cavity, the insulator is provided with a second liquid inlet pipe and a second liquid discharge pipe respectively, and the second liquid inlet pipe and the second liquid discharge pipe extend out of the circular waveguide along the insulator;

[0021] When the insulator is connected to the connecting seat, the second liquid inlet pipe is aligned with and communicated with the first liquid inlet pipe, and the second liquid discharge pipe is aligned with and communicated with the first liquid discharge pipe;

[0022] The cooling medium enters the cooling cavity through the first liquid inlet pipe and the second liquid inlet pipe that are connected, cools the piston body, and is then discharged through the first liquid discharge pipe and the second liquid discharge pipe that are connected.

[0023] Furthermore, a liquid inlet conduit and a liquid outlet conduit are transversely disposed on the insulating member, one end of the liquid inlet conduit is connected to the second liquid inlet pipe, and the other end forms a liquid inlet;

[0024] One end of the liquid outlet conduit is communicated with the second liquid discharge pipe, and the other end forms a liquid discharge port, and the liquid inlet and the liquid discharge port are respectively located on two sides of the insulating member.

[0025] Furthermore, a recess is provided in the connection seat, and the insulator is inserted into the recess and is threadedly connected to the recess, thereby achieving connection between the insulator and the connection seat;

[0026] A sealing ring is provided at the threaded connection between the insulator and the connecting seat to prevent leakage of coolant at the joints between the first liquid inlet pipe and the second liquid inlet pipe, and the first liquid discharge pipe and the second liquid discharge pipe.

[0027] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0028] There is no direct contact between the piston body and the circular waveguide tube in the embodiment of the present application, forming a non-contact waveguide short-circuiter. The movement of the piston body in the circular waveguide tube is not restricted, and precise control of the position of the piston body is easy to achieve, and the piston body will not be worn. In addition, the tuning device can adjust the insertion depth of the short-circuit surface in the circular waveguide synthesizer, thereby facilitating the adjustment of the position of the short-circuit surface in the waveguide cavity.

[0029] In addition, the embodiment of the present application drives the lead screw to rotate by turning the hand crank handle, thereby driving the insulating part to move left and right, thereby driving the piston body to move left and right. It not only has a simple structure and low cost, but is also easy to operate by hand cranking and is very convenient. At the same time, the position adjustment method of driving the piston body to move horizontally by turning the lead screw makes it easier to achieve precise control of the short-distance road surface position.

[0030] At the same time, the aperture of the central axis hole of the end cover is much smaller than the diameter of the circular waveguide synthesizer. Since the radio frequency signal working in the circular waveguide is affected by the inner diameter of the circular waveguide, it is not suitable for transmission in the end cover. Most of the signals are reflected by the piston body, and a very small part of the signals passes through the gap between the piston body and the circular waveguide tube. Only a very small amount of signals will leak out from the gap between the central axis hole and the insulating part. In addition, since the insulating part is made of hard insulating material, it is safe and reliable.

[0031] Finally, the embodiment of the present application is also provided with a cooling system for cooling the piston body, which can reduce the temperature of the piston body and control the deformation of the piston body, and is suitable for high-power waveguide synthesizers. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of a non-contact waveguide short circuit device in one embodiment of the present invention;

[0034] Figure 2 A cross-sectional view of a non-contact waveguide short circuit device according to an embodiment of the present invention;

[0035] Figure 3 The figure is a schematic diagram of a non-contact waveguide short circuit device in use according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The embodiment of the present application provides a non-contact waveguide short circuit device, thereby solving the technical problems in the prior art that the waveguide short circuit surface of the waveguide short circuit device is easily worn and the position cannot be accurately controlled.

[0037] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] like Figures 1 to 3As shown, one or more embodiments of the present application provide a non-contact waveguide short circuit device, comprising a circular waveguide tube 10 and a piston body 20 coaxially arranged in the circular waveguide tube 10, wherein the piston body 20 can move horizontally along the axial direction of the circular waveguide tube 10 to achieve tuning. Moreover, the outer diameter of the piston body 20 is slightly smaller than the inner diameter of the circular waveguide tube 10, and there is no direct contact between the piston body 20 and the circular waveguide tube 10, so that a non-contact waveguide short circuit device is formed, and the movement of the piston body 20 in the circular waveguide tube 10 is not restricted, and it is easy to achieve precise control of the position of the piston body 20, and the piston body 20 will not be worn.

[0039] An insulating support member 22 is also provided between the outer circumferential surface of the piston body 20 and the inner circumferential surface of the circular waveguide tube 10. The insulating support member 22 is fixed on the outer circumferential surface of the piston body 20 and extends radially outwardly along the piston body 20 to contact the inner wall surface of the circular waveguide tube 10 to further avoid contact between the piston body 20 and the circular waveguide tube 10. The insulating support member 22 is fixed on the piston body 20, which is more conducive to the movement of the piston body 20 than being fixed on the circular waveguide tube 10.

[0040] Specifically, the insulating support members 22 include four, and of course three, six, more or less, or unequally spaced, arranged along the circumference of the piston body 20. The insulating support members 22 can be made of soft insulating materials, such as rubber, silicone, etc.

[0041] by Figure 3 The direction of the non-contact waveguide short circuit device in use is based on the direction shown in the figure. The circular waveguide tube 10 is in the shape of a hollow cylinder and is made of a metal material, such as a copper metal alloy. The left end of the circular waveguide tube 10 is open, and a ring edge 11 is provided on the outer peripheral surface near the left end. The ring edge 11 is provided with an axially penetrating threaded hole. By screwing a first bolt into the threaded hole, the circular waveguide tube 10 can be tightened and fixed on the circular waveguide synthesizer 60 or other objects, such as Figures 1 to 3 The right end surface 12 of the circular waveguide 10 is fixedly connected to an end cover 13 by a second bolt 14. A central axial hole 15 is provided at the center of the end cover 13 and passes through the axial direction of the circular waveguide 10. The central axial hole 15 can be passed through by the insulating member 30 described below.

[0042] The piston body 20 is made of metal material, such as copper, metal alloy, etc., and is in the shape of a hollow cylinder. The piston body 20 is inserted into the circular waveguide tube 10 and opens toward one end (right end) of the end cover 13 so that the inner cavity of the piston body 20 and the central axis hole 15 are connected. The left end of the piston body 20 is formed with an arc-shaped end surface serving as a short-circuit path 21, and the inner surface of the arc-shaped end surface is provided with a connecting seat 23 extending along the central axis of the piston body 20, and the connecting seat 23 is used to connect the insulating member 30 described below.

[0043] The insulating member 30 includes an inner section 31 which can be inserted into the cavity of the piston body 20 through the central axis hole 15 and fixedly connected to the connecting seat 23, and an outer section 32 exposed to the circular waveguide 10. The inner section 31 is cylindrical, and the outer diameter of the inner section 31 is slightly smaller than the aperture of the central axis hole 15, so that the insulating member 30 does not contact the end cover 13. The outer section 32 is connected to a tuning device for driving the insulating member 30 to drive the piston body 20 to move left and right along the axial direction relative to the circular waveguide 10, so as to adjust the insertion depth of the short-circuit surface 21 in the circular waveguide synthesizer 60, thereby adjusting the position of the short-circuit surface 21 in the waveguide cavity.

[0044] Specifically, the aperture of the central axis hole 15 of the end cover 13 is much smaller than the diameter of the circular waveguide synthesizer 60. Since the radio frequency signal working in the circular waveguide synthesizer 60 is affected by the inner diameter of the circular waveguide synthesizer 60, it is not suitable for transmission in the end cover 13. Most of the signals are reflected by the piston body 20, and a very small amount of signals pass through the gap between the piston body 20 and the circular waveguide tube 10. Only a very small amount of signals will leak out from the gap between the central axis hole 15 and the insulating member 30. In addition, since the insulating member 30 is made of hard insulating materials, such as polyvinyl chloride, Ultem (a polyetherimide), etc., it has been verified that the transmission loss is about 100dB, which is safe and reliable.

[0045] Furthermore, a recess is formed on the connecting seat 23, an inner wall of the recess is provided with an internal thread, an inner section 31 of the insulating member 30 is provided with an external thread, the inner section 31 of the insulating member 30 is partially inserted into the recess, and a threaded connection is achieved through the cooperation of the external thread and the internal thread.

[0046] Furthermore, the tuning device includes an adjustment platform 41 laid under the insulating member 30, the left end of the adjustment platform 41 is fixed on the end cover 13, the right end of the adjustment platform 41 extends to the right along the axial direction of the circular waveguide tube 10, and a lead screw 42 parallel to the axial direction of the circular waveguide tube 10 is rotatably provided on the adjustment platform 41, and a hand crank handle 43 is connected to the right end of the lead screw 42 to drive the lead screw 42 to rotate; a slide plate 44 is engaged with the lead screw 42, and the outer section 32 of the insulating member 30 is fixed on the slide plate 44.

[0047] In this way, by rotating the hand crank handle 43, the lead screw 42 can be driven to rotate. Due to the engagement of the lead screw 42 and the slide plate 44, the forward and reverse rotation of the lead screw 42 can be converted into the left and right horizontal movement of the slide plate 44, which can drive the insulating part 30 to move left and right, thereby driving the piston body 20 to move left and right. The tuning structure is simple and the cost is low. At the same time, the position adjustment method of driving the piston body 20 to move horizontally by rotating the lead screw 42 is easier to achieve precise control, and the hand crank method is easy to operate and very convenient.

[0048] In addition, a length scale 46 extending along the length direction of the lead screw 42 is provided on the side of the adjustment platform 41, and an indicator mark 49 corresponding to the length scale 46, such as an indicator needle, is provided on the side of the same side of the slide plate 44 to align with the length scale 46, so as to measure the moving distance of the slide plate 44, thereby facilitating further precise adjustment of the position of the short-circuit surface 21.

[0049] Furthermore, the insulating member 30 is fixed to the skateboard 44 via a connecting plate 50, wherein the bottom surface of the connecting plate 50 is fixed to the skateboard 44, and a bolt hole for connecting the outer section 32 is provided on the top surface of the connecting plate 50, and the outer section 32 is fixed to the connecting plate 50 via a third bolt 31.

[0050] Furthermore, both sides of the slide plate 44 can be slidably inserted into the slide rod 45, and the slide rod 45 is respectively fixedly arranged on both sides of the lead screw 42 and parallel to the lead screw 42. Due to the arrangement of the slide rod 45 and the connecting plate 50, the movement of the insulating member 30 is smoother.

[0051] In addition, the bottom surface of the adjustment platform 41 is fixed to the end cover 13 through a right-angle frame 47, and the two perpendicular connecting surfaces of the right-angle frame 47 are respectively fixed to the end cover 13 and the adjustment platform 41 through fourth bolts, and the right-angle frame 47 is provided with reinforcing ribs 48 to improve the load-bearing capacity and support stability.

[0052] It should be clear that the setting height of the tuning device needs to ensure that the inner section 31 of the insulating member 30, the piston body 20 and the circular waveguide 10 are coaxially arranged. In addition, the sliding stroke of the insulating member 30 is long enough to prevent the connection seat 23 from contacting the end cover 13 during the sliding process.

[0053] In the prior art, a high-power waveguide synthesizer uses a plurality of input ports to input simultaneously to increase the synthesized power. When multiple input ports are input simultaneously, the internal temperature of the waveguide synthesizer is likely to increase, causing the frequency shift of the synthesized signal. For this reason, the non-contact waveguide short circuit device described in the embodiment of the present application is also provided with a cooling system for cooling the piston body 20.

[0054] like Figures 1 to 3 As shown, the cooling system includes a cooling chamber 24, a first liquid inlet pipe 26 and a first liquid discharge pipe 27 arranged in the connecting seat 23, the outlet of the first liquid inlet pipe 26 and the inlet of the first liquid discharge pipe 27 are respectively connected to the cooling chamber 24, and the inlet of the first liquid inlet pipe 26 and the outlet of the first liquid discharge pipe 27 extend to the recessed part of the connecting seat 23 respectively.

[0055] A second liquid inlet pipe 33 and a second liquid discharge pipe 34 are respectively provided on the inner section 31 of the insulating member 30, and the outlet of the second liquid inlet pipe 33 and the inlet of the second liquid discharge pipe 34 respectively extend to the end surface of the inner section 31 of the insulating member 30; when the insulating member 30 is threadedly connected and fixed to the connecting seat 23, the first liquid inlet pipe 26 and the first liquid discharge pipe 27 are respectively connected to and communicated with the second liquid inlet pipe 33 and the second liquid discharge pipe 34.

[0056] The inlet of the second liquid inlet pipe 33 and the outlet of the second liquid discharge pipe 34 extend along the insulating part 30 to the outside of the circular waveguide tube 10 to connect to the cooling water source and discharge the cooling water in the cooling chamber 24 to form a cooling cycle to reduce the temperature of the piston body 20. Of course, the cooling water can also be other cooling media such as softened water and cooling oil.

[0057] The cooling medium enters the cooling chamber 24 through the first liquid inlet pipe 26 and the second liquid inlet pipe 33, cools the piston body 20, and then is discharged through the first liquid discharge pipe 27 and the second liquid discharge pipe 34, which can control the deformation of the piston. To improve the cooling effect, the connecting seat 23 is tightly connected to the piston body 20, for example, they are integrally arranged, and the connecting seat 23 can be made of a metal material with good thermal conductivity, such as copper.

[0058] In order to facilitate the second liquid inlet pipe 33 and the second liquid discharge pipe 34 to connect to and discharge cooling water, a liquid inlet conduit and a liquid outlet conduit are respectively horizontally arranged on the insulating member 30. The inner end of the liquid inlet conduit is connected to the inlet of the second liquid inlet pipe 33, and the outer end of the liquid inlet conduit forms a liquid inlet port 36. The inner end of the liquid outlet conduit is connected to the outer end of the second liquid discharge pipe 34, and the outer end of the liquid outlet conduit forms a liquid discharge port 35. Due to the provision of the liquid inlet conduit and the liquid outlet conduit, the liquid inlet port 36 and the liquid discharge port 35 are respectively located on both sides of the insulating member 30, which is more conducive to connecting the cooling water source and discharging the cooling water in the cooling chamber 24 to the outside.

[0059] Further, such as Figure 2 , 3 As shown, a sealing ring is provided at the threaded connection between the connecting seat 23 and the insulating member 30 to prevent leakage of coolant at the joints between the first liquid inlet pipe 26 , the first liquid discharge pipe 27 and the second liquid inlet pipe 33 , the second liquid discharge pipe 34 .

[0060] Furthermore, Figure 2 , 3 As shown, the cooling cavity 24 is provided with a drain port connected to the cooling cavity 24 on the circumferential surface of the connecting seat 23, and the drain port is provided with a sealing plug 25 to completely drain the coolant in the cooling cavity 24 when necessary.

[0061] The connecting seat 23 not only plays the role of physically connecting the piston body 20 and the insulating member 30 , but also has the cooling cavity 24 disposed thereon to cool the piston body 20 , thereby simplifying the structure.

[0062] It should be understood that although the terms "first", "second", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit without departing from the scope of the exemplary embodiments.

[0063] The directional terms such as outer, middle, inner, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0064] The above is only a preferred embodiment of the present application, and is not any formal or substantial limitation to the present application. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present application, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present application, can make some changes, modifications and evolutions of the technical content disclosed above, which are equivalent embodiments of the present application; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the substantial technology of the present application are still within the scope of the technical solution of the present application.

Claims

1. A non-contact waveguide short circuit device, characterized in that: It comprises a piston body and a circular waveguide tube, wherein one end of the piston body is formed with a short-circuit surface, the other end of the piston body is inserted into the circular waveguide tube through one end of the circular waveguide tube, and there is a gap between the outer wall surface of the piston body and the inner wall surface of the circular waveguide tube; The piston body is connected to a tuning device, and the tuning device can drive the piston body to move horizontally in the circular waveguide tube, so as to adjust the position of the short-circuit surface relative to the circular waveguide tube.

2. A non-contact waveguide short circuit device as claimed in claim 1, characterized in that: An insulating support is also provided between the outer wall surface of the piston body and the inner wall surface of the circular waveguide tube. One side of the insulating support is fixed on the outer wall surface of the piston body, and the other side is in contact with the inner wall surface of the circular waveguide tube.

3. A non-contact waveguide short circuit device as claimed in claim 1, characterized in that: The other end of the circular waveguide tube is provided with an end cap, and the insulator can pass through the end cap in a horizontally movable manner; One end of the insulator located inside the circular waveguide is connected to the piston body, and one end of the insulator located outside the circular waveguide is connected to the tuning device, and the tuning device drives the piston body to move horizontally through the insulator; Wherein, the insulator is made of insulating material, and the insulator is not in contact with the end cover.

4. A non-contact waveguide short circuit device as claimed in claim 1, characterized in that: The tuning device comprises a fixed adjustment platform, a lead screw extending in a horizontal direction is rotatably passed through the adjustment platform, a slide plate is engaged with the lead screw, and the insulator is fixed on the slide plate; When the lead screw rotates, it drives the slide plate to move horizontally, thereby driving the piston body to move horizontally.

5. A non-contact waveguide short circuit device as claimed in claim 4, characterized in that: One end of the lead screw is connected with a hand crank handle for driving the lead screw to rotate.

6. A non-contact waveguide short circuit device as claimed in claim 4, characterized in that: The adjusting platform is provided with a length scale extending along the length direction of the lead screw, and the slide plate is provided with an indication mark for indicating the length scale. The indication mark and the length scale are used to indicate the horizontal movement distance of the slide plate.

7. A non-contact waveguide short circuit device as claimed in claim 4, characterized in that: Both sides of the slide plate are slidably arranged on the slide rods, and the slide rods are respectively fixedly arranged on both sides of the lead screw and are parallel to the lead screw. When the lead screw drives the slide plate to move horizontally, the slide plate slides on the slide rods.

8. A non-contact waveguide short circuit device as claimed in claim 3, characterized in that: The piston body is hollow inside, and the other end of the piston body is open. A connecting seat is provided on the inner surface of the short-circuit path. The insulator passing through the end cover enters the piston body through the opening of the piston body and is connected to the connecting seat, thereby being connected to the piston body. The connecting seat is provided with a cooling cavity and a first liquid inlet pipe and a first liquid discharge pipe respectively connected with the cooling cavity, the insulator is provided with a second liquid inlet pipe and a second liquid discharge pipe respectively, and the second liquid inlet pipe and the second liquid discharge pipe extend out of the circular waveguide along the insulator; When the insulator is connected to the connecting seat, the second liquid inlet pipe is aligned with and communicated with the first liquid inlet pipe, and the second liquid discharge pipe is aligned with and communicated with the first liquid discharge pipe; The cooling medium enters the cooling cavity through the first liquid inlet pipe and the second liquid inlet pipe that are connected, cools the piston body, and is then discharged through the first liquid discharge pipe and the second liquid discharge pipe that are connected.

9. A non-contact waveguide short circuit device as claimed in claim 8, characterized in that: A liquid inlet conduit and a liquid outlet conduit are respectively disposed transversely on the insulating member, one end of the liquid inlet conduit is connected to the second liquid inlet pipe, and the other end forms a liquid inlet; One end of the liquid outlet conduit is communicated with the second liquid discharge pipe, and the other end forms a liquid discharge port, and the liquid inlet and the liquid discharge port are respectively located on two sides of the insulating member.

10. A non-contact waveguide short circuit device as claimed in claim 8, characterized in that: A recess is provided in the connection seat, and the insulator is inserted into the recess and is threadedly connected with the recess, thereby achieving connection between the insulator and the connection seat; A sealing ring is provided at the threaded connection between the insulator and the connecting seat to prevent leakage of coolant at the joints between the first liquid inlet pipe and the second liquid inlet pipe, and the first liquid discharge pipe and the second liquid discharge pipe.

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