A piezoelectric ceramic relay

Abstract

The present invention discloses a piezoelectric ceramic relay, which relates to the field of relays. Aiming at the problems of the existing piezoelectric ceramic relay, such as relatively large volume, complex internal structure and relatively high failure rate, the present invention proposes the following solution. It includes a piezoelectric output element and a drive circuit board for driving the piezoelectric output element, and also includes a link mechanism for triggering the relay function and a middle frame, a first cover plate and a second cover plate that constitute the housing. The piezoelectric output element includes a first piezoelectric ceramic sheet and a second piezoelectric ceramic sheet, and a steel sheet is glued between the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet. Both ends of the piezoelectric output element are inserted into the inner walls of both ends of the middle frame. The link mechanism includes a semi-circular support, a contact moving piece, a spring piece and a contact static piece. The piezoelectric ceramic relay of the present invention has a small and compact structure, is simple and novel, stable and reliable, and solves the problems of the existing piezoelectric ceramic relay, such as relatively large volume, complex internal structure and relatively high failure rate.

Description

Technical Field

[0001] The present invention relates to the field of relays, and particularly to a piezoelectric ceramic relay. Background Art

[0002] Piezoelectric ceramics are a special material that can convert electrical energy into mechanical energy. When an electric field is applied to piezoelectric ceramics, the size of the piezoelectric ceramic material will increase slightly. Utilizing this property of piezoelectric ceramics, mechanical devices can be driven to perform very precise movements. Currently, piezoelectric ceramic materials have been used in the manufacture of relays;

[0003] Taking the most commonly used rectangular single-piece piezoelectric ceramic material as an example, under the action of an electric field, the deformation amount is the largest in the length direction. Therefore, if we want to use this phenomenon to drive the movement of the relay pin, a connecting rod structure with negative pressure needs to be designed at both ends of the piezoelectric ceramic material, making the piezoelectric ceramic relay have a relatively large volume, a complex internal structure, and a relatively high failure rate. Therefore, to solve the above problems, we propose a piezoelectric ceramic relay with a new structure. Summary of the Invention

[0004] The piezoelectric ceramic relay with a new structure proposed by the present invention solves the problems of the existing piezoelectric ceramic relay, such as relatively large volume, complex internal structure, and relatively high failure rate.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A piezoelectric ceramic relay includes a piezoelectric output element and a drive circuit board for driving the piezoelectric output element, and further includes a connecting rod mechanism for triggering the relay function, and a middle frame, a first cover plate, and a second cover plate that form a housing;

[0007] The piezoelectric output element includes a first piezoelectric ceramic sheet and a second piezoelectric ceramic sheet, and a steel sheet is glued between the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet. Both ends of the piezoelectric output element are inserted into the inner walls of both ends of the middle frame;

[0008] The connecting rod mechanism includes a semi-circular support, a movable contact piece, a spring piece, and a static contact piece. One end of the semi-circular support and one end of the spring piece are both inserted into the inner wall of the middle frame. One end of the movable contact piece is provided with a first arc bend, the first arc bend is sleeved with the semi-circular support, and the end of the spring piece is pressed against the end of the first arc bend. A push block is glued to the bottom end surface of the piezoelectric output element, and the push block presses against the body of the movable contact piece.

[0009] As a preferred technical solution of the present invention, one end of the semi-circular support is integrally connected with a first pin, the static contact piece is integrally connected with a second pin, and the drive circuit board is electrically connected with a third pin.

[0010] As a preferred technical solution of the present invention, the first pin, the second pin and the two groups of third pins vertically penetrate the bottom end of the middle frame downward, and the first pin, the second pin and the two groups of third pins are symmetrically arranged with respect to both ends of the middle frame, and the inner wall of the middle frame is provided with card slots corresponding to the first pin, the second pin, the two groups of third pins, the semi-circular support and the elastic sheet.

[0011] As a preferred technical solution of the present invention, both ends of the steel sheet protrude from the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet, and both ends of the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet and the steel sheet are polished into an arc shape. The card slot is an arc-shaped groove corresponding to both ends of the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet, and the card slot is triangular corresponding to both ends of the steel sheet.

[0012] As a preferred technical solution of the present invention, the static contact piece and the piezoelectric output element are both horizontally arranged, and the arc openings of the first arc bend and the semi-circular support are both upward. A second arc bend is provided at the end of the first arc bend, and the arc surface of the second arc bend contacts the bottom end surface of the elastic sheet.

[0013] As a preferred technical solution of the present invention, a gasket is arranged between the elastic sheet and the semi-circular support, and the second screw penetrates the elastic sheet, the gasket and is threadedly connected to the semi-circular support.

[0014] As a preferred technical solution of the present invention, a copper contact is arranged between the ends of the moving contact piece and the static contact piece, and the end faces of the two groups of copper contacts close to each other are both inclined surfaces.

[0015] As a preferred technical solution of the present invention, short columns are arranged at the four corners of the inner wall of the top end of the middle frame, and the four corners of the driving circuit board are connected to the short columns through the third screws. The driving circuit board is electrically connected to the piezoelectric output element through a wire.

[0016] As a preferred technical solution of the present invention, the first cover plate and the second cover plate are symmetrically distributed on both sides of the middle frame, and the four corners of the second cover plate are provided with first screws. The four groups of first screws penetrate the middle frame and are respectively threadedly connected to the four corners of the first cover plate.

[0017] As a preferred technical solution of the present invention, the initial charging polarization voltage of the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet is 600V DC , and the secondary polarization voltage of the piezoelectric output element is 1200V DC .

[0018] The beneficial effects of the present invention are:

[0019] 1. The device uses a piezoelectric output element composed of two piezoelectric ceramic sheets sandwiching a steel sheet. After the piezoelectric output element is polarized as a whole, a voltage of the same sign is applied to the first piezoelectric ceramic, and a voltage of the opposite sign is applied to the second piezoelectric ceramic sheet. This causes the first piezoelectric ceramic sheet to contract and the second piezoelectric ceramic sheet to elongate, thereby forcing the piezoelectric output element, which is glued together and clamped at both ends, to bend downward. Similarly, by changing the application direction of the voltage electrodes, the piezoelectric output element will bend upward, thus realizing the control of the moving contact piece with the cooperation of the elastic sheet.

[0020] 2. The moving contact piece of the device is sleeved with the semi-circular support through the first arc bending, meeting the deflection support requirements of the moving contact piece. The end of the first arc bending extends outward and is further provided with a second arc bending, and the end of the elastic sheet is crimped on the second arc bending. Through the lever principle, the pressing piece makes the moving contact piece always closely adhere to the piezoelectric output element, and the moving contact piece and the elastic sheet always contact through the arc surface, making the structure simple and durable.

[0021] 3. Both ends of the steel sheet protrude from the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet, and both ends of the first piezoelectric ceramic sheet, the second piezoelectric ceramic sheet, and the steel sheet are polished into an arc shape. The card slots are arc-shaped grooves corresponding to both ends of the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet, and the card slots are triangular corresponding to both ends of the steel sheet. When the piezoelectric output element is repeatedly triggered and bent repeatedly, the edges of the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet are in arc surface contact with the middle frame, and the steel sheet has enough free deflection space, thereby extending the service life of the piezoelectric output element.

[0022] In summary, the piezoelectric ceramic relay has a small and compact structure, is simple and novel, stable and reliable, and solves the problems of the existing piezoelectric ceramic relays, such as relatively large volume, complex internal structure, and relatively high failure rate. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the present invention.

[0024] Figure 2 It is a schematic structural diagram of the disassembled housing of the present invention.

[0025] Figure 3 It is of the present invention Figure 2 Schematic structural diagram of further disassembly.

[0026] Figure 4 It is of the present invention Figure 3 Schematic structural diagram of further disassembly.

[0027] Figure 5 It is a schematic assembly structural diagram of the piezoelectric output element and the middle frame of the present invention.

[0028] Figure 6Schematic cross-sectional structure diagram of the piezoelectric output element of the present invention.

[0029] Figure 7 Schematic diagram of the initial charging and polarization of the first piezoelectric ceramic sheet of the present invention.

[0030] Figure 8 Schematic diagram of the initial charging and polarization of the piezoelectric output element of the present invention.

[0031] Figure 9 Schematic diagram of the upper bending structure of the piezoelectric output element of the present invention.

[0032] Figure 10 Schematic diagram of the lower bending structure of the piezoelectric output element of the present invention.

[0033] Figure 11 Schematic diagram of the upper and lower bending structures of the piezoelectric output element of the present invention.

[0034] Figure 12 Schematic diagram of the relay of the present invention in a non-operating state.

[0035] Figure 13 Schematic diagram of the relay of the present invention in an open working state.

[0036] Figure 14 Schematic diagram of the relay of the present invention in a closed working state.

[0037] Figure 15 Drive circuit diagram of the piezoelectric output element of the present invention.

[0038] Reference numerals in the figure: 1, middle frame; 101, first cover plate; 102, second cover plate; 103, first screw; 104, card slot; 105, short column; 2, link mechanism; 201, semi-circular support; 202, first pin; 203, contact moving piece; 204, first arc bend; 205, second arc bend; 206, elastic piece; 207, gasket; 208, second screw; 209, contact static piece; 210, second pin; 211, copper contact; 3, piezoelectric output element; 301, first piezoelectric ceramic sheet; 302, steel sheet; 303, second piezoelectric ceramic sheet; 304, push block; 4, drive circuit board; 401, third pin; 402, third screw; 5, link; 6, moving piece; 7, rotation center; 8, fixed piece; 9, fixed end of the fixed piece; 10, contact; 11, return elastic piece. Detailed implementation manners

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Referring to Figures 1 - 15 , a piezoelectric ceramic relay includes a piezoelectric output element 3 and a drive circuit board 4 for driving the piezoelectric output element 3, and further includes a link mechanism 2 for triggering the relay function and a middle frame 1, a first cover plate 101, and a second cover plate 102 that form the housing; the piezoelectric output element 3 includes a first piezoelectric ceramic sheet 301 and a second piezoelectric ceramic sheet 303, and a steel sheet 302 is glued between the first piezoelectric ceramic sheet 301 and the second piezoelectric ceramic sheet 303. Both ends of the piezoelectric output element 3 are inserted into the inner walls of both ends of the middle frame 1; the link mechanism 2 includes a semi-circular support 201, a contact moving piece 203, a spring piece 206, and a contact static piece 209. One end of the semi-circular support 201 and the spring piece 206 are both inserted into the inner wall of the middle frame 1, and a first arc bending 204 is provided at one end of the contact moving piece 203. The first arc bending 204 is sleeved on the semi-circular support 201, and the end of the spring piece 206 is pressed against the end of the first arc bending 204. A push block 304 is glued to the bottom end surface of the piezoelectric output element 3, and the push block 304 presses against the body of the contact moving piece 203.

[0042] One end of the semi-circular support 201 is integrally connected with a first pin 202. The contact static piece 209 is integrally connected with a second pin 210. The driving circuit board 4 is electrically connected with a third pin 401. The first pin 202, the second pin 210, and two sets of third pins 401 penetrate vertically downward through the bottom end of the middle frame 1, and the first pin 202, the second pin 210, and two sets of third pins 401 are symmetrically arranged with respect to both ends of the middle frame 1. And the inner wall of the middle frame 1 is provided with a card slot 104 corresponding to the first pin 202, the second pin 210, two sets of third pins 401, the semi-circular support 201, and the elastic piece 206.

[0043] As Figure 5 shown, both ends of the steel sheet 302 protrude from the first piezoelectric ceramic sheet 301 and the second piezoelectric ceramic sheet 303, and both ends of the first piezoelectric ceramic sheet 301, the second piezoelectric ceramic sheet 303, and the steel sheet 302 are polished into an arc shape. The card slot 104 is an arc-shaped groove corresponding to both ends of the first piezoelectric ceramic sheet 301 and the second piezoelectric ceramic sheet 303, and the card slot 104 is triangular corresponding to both ends of the steel sheet 302.

[0044] The contact static piece 209 and the piezoelectric output element 3 are both horizontally arranged, and the arc openings of the first arc bend 204 and the semi-circular support 201 are both upward. The end of the first arc bend 204 is provided with a second arc bend 205, and the arc surface of the second arc bend 205 is in contact with the bottom end surface of the elastic piece 206. A gasket 207 is arranged between the elastic piece 206 and the semi-circular support 201. The second screw 208 penetrates through the elastic piece 206 and the gasket 207 and is threadedly connected to the semi-circular support 201. A copper contact 211 is arranged between the ends of the contact moving piece 203 and the contact static piece 209, and the end surfaces of the two sets of copper contacts 211 close to each other are both inclined surfaces.

[0045] Short columns 105 are arranged at the four corners of the inner wall of the top end of the middle frame 1, and the four corners of the driving circuit board 4 are connected to the short columns 105 through third screws 402. The driving circuit board 4 is electrically connected to the piezoelectric output element 3 through a wire. The first cover plate 101 and the second cover plate 102 are symmetrically distributed on both sides of the middle frame 1, and the four corners of the second cover plate 102 are provided with first screws 103. The four sets of first screws 103 penetrate through the middle frame 1 and are threadedly connected to the four corners of the first cover plate 101 respectively.

[0046] The working principle of the link mechanism 2 of this device: The middle frame 1, the first cover plate 101, and the second cover plate 102 made of plastic provide protection and structural support for the internal parts. This device supplies power to the drive circuit board 4 through two groups of third pins 401. The drive circuit board 4 provides a high-voltage electric field for the piezoelectric force-generating element 3. Under the action of the electric field, the piezoelectric force-generating element 3 bends upward, causing the push block 304 to move upward. At the same time, under the pressure of the elastic piece 206, the contact moving piece 203 deflects upward with the first arc bending 204 as the rotation point. The contact moving piece 203 always closely adheres to the push block 304. When the drive circuit board 4 changes the direction of the electric field, the piezoelectric force-generating element 3 bends downward, and the push block 304 is used to push the contact moving piece 203 downward, causing the copper contact 211 at the end of the contact moving piece 203 to squeeze and contact the copper contact 211 at the end of the contact static piece 209, so that the first pin 202, the semi-circular support 201, the contact moving piece 203, the copper contact 211, the contact static piece 209, and the second pin 210 are connected.

[0047] Embodiment

[0048] For the experimental piezoelectric ceramic relay, the force generated by the expansion and contraction deformation of the piezoelectric ceramic is used to push the opening and closing of the relay contacts, realizing the on and off of the circuit current. In this embodiment, taking the relay with an external dimension of 29X13X16.5 (mm) and a make-and-break current of 15A as a reference, the principle of making the piezoelectric ceramic relay is as follows: AC , and the make-and-break current is 15A. Taking the relay as a reference, the principle of making the piezoelectric ceramic relay is as follows:

[0049] As Figure 6 shown, the first piezoelectric ceramic sheet 301 and the second piezoelectric ceramic sheet 303 are PZT piezoelectric ceramic sheets, and the steel sheet 302 is high-elastic stainless steel. The piezoelectric ceramic sheets are first subjected to initial charging polarization. As Figure 7 , the polarization voltage is 600V DC , and the time is 5 minutes. Use high-temperature curing epoxy resin to bond the two ceramic sheets together with the stainless steel sheet as Figure 6 shown. The bonded component is subjected to secondary polarization. As Figure 8 shown, at this time, the two piezoelectric ceramic sheets can be regarded as superimposed, so the polarization voltage is doubled to 1200V DC , and the time is 30 minutes. At the same time, polarization voltage polarity marks (+) and (-) should be made on the ceramic sheets.

[0050] The working principle of the piezoelectric output element 3 of the device is as follows: the piezoelectric ceramic piece has reverse piezoelectricity after being charged and polarized, that is, deformation occurs when voltage is applied to the two poles. For a rectangular ceramic piece, there is a relatively poor and obvious expansion and contraction deformation in the length direction. When the sign of the applied voltage is the same as the sign of the polarization voltage (i.e., the same-sign voltage), the piezoelectric piece produces contraction deformation. When the sign of the applied voltage is different from the sign of the polarization voltage (i.e., the opposite-sign voltage), the piezoelectric piece produces elongation deformation. The size of the applied voltage must be limited to a certain extent. The same-sign voltage can be higher, and the opposite-sign voltage should be limited to the piezoelectric ceramic piece's stubborn voltage, otherwise depolarization will occur and the working performance will be lost. Of course, the same-sign voltage should not be too high, and the problems of the ceramic piece's insulation withstand voltage and excessive deformation and rupture should be taken into consideration. According to the thickness of the ceramic piece, the same-sign voltage is 1000V / mm and the opposite-sign voltage is 500V / mm. Usually, under the action of the permissible voltage, the expansion and contraction of the piezoelectric ceramic piece in the length direction is about one thousandth.

[0051] See also Figure 8 The piezoelectric output element remains straight in the free state. If a voltage of 200V is applied between the upper ceramic plate and the metal plate DC ; Add a voltage of 100V between the lower ceramic plate and the metal plate DC , the output element bends downward. This is because the upper ceramic sheet shrinks and the lower ceramic sheet stretches. The bonding surface between the ceramic sheet and the metal plate cannot be offset, causing the metal plate to bend and the ceramic sheet itself to bend. Figure 9 Similarly, if the same voltage is applied to the lower ceramic and the opposite voltage is applied to the upper ceramic, the output element will bend upward. Figure 10 .

[0052] Figure 11 As shown: two supporting points are set at both ends of the output element. Under the alternating action of the above-mentioned external DC voltage, the output element bends up and down, and the displacement of its center point is about 0.3mm. If a 180g weight G is hung at this point, the displacement is reduced to 0.25mm, which means that the center point of the output element can produce a displacement of 0.25mm and a force of 180g; the displacement of the center point is used to drive the opening and closing of the relay contacts;

[0053] See Figure 12 Schematic diagram, the two ends of the piezoelectric output element 3 are the two fulcrums of the piezoelectric output element 3, the bottom of the piezoelectric output element 3 is provided with a connecting rod 5, the bottom of the connecting rod 5 is connected with a moving piece 6, one end of the moving piece 6 is the rotation center 7 of the moving piece 6, a stator 8 is provided below the moving piece 6, one end of the moving piece 6 and the stator 8 are both provided with a contact 10, and the other end of the stator 8 is provided with a stator fixed end 9, and the other end of the moving piece 6 is provided with a return spring 11; Figure 12The relay shown is in a non-operating state. The gap between the two contacts 10 is about 0.15 mm. One end of the connecting rod 5 abuts against the center point of the piezoelectric output element 3, and the other end abuts against the 18:6 position on the length direction of the moving piece 6 away from the rotation center 7. Referring to Figure 11 the analysis, the contact 10 on the moving piece 6 can generate a displacement of (18;3)×0.25 = 0.75 mm and a force of 180 / 18:6 = 60 grams;

[0054] As Figure 13 , Figure 14 shown, it is a schematic diagram of the relay in the operating state, where Figure 13 is the open state. At this time, a voltage of -100 V with opposite sign is applied to the upper ceramic sheet of the piezoelectric element, and a voltage of -200 V with the same sign is applied to the lower ceramic sheet. The gap between the two contacts > 0.3 mm; Figure 14 is the closed state. At this time, a voltage of +200 V with the same sign is applied to the upper ceramic sheet of the piezoelectric element, and a voltage of +100 V with opposite sign is applied to the lower ceramic sheet.

[0055] The electronic components and the working circuit diagram on the drive circuit board 4 are as Figure 15As shown, in one cycle of the relay's opening and closing, in the piezoelectric output element 3, the voltage of the first piezoelectric ceramic sheet 301 experiences a change of -100V — +200V — -100V; while for the corresponding second piezoelectric ceramic sheet 303, it is a change of -200V — +100V — -200V. This change is completed under the control of the drive circuit for the external circuit switch. The principle is as follows: The AC 220V alternating current passes through the current-limiting resistor R1 and is rectified by the diode D1, and filtered by the electrolytic capacitor C1 to obtain a DC voltage of DC240V. This voltage is applied to the base of the triode Q through the resistors R5 and R6, and also applied to the collector of the triode Q through R7. The arrows A and B point to the external circuit control switch. When the control switch is off, R5 and R6 cause the triode Q to be fully conducting. Point C is equivalent to being connected to the negative terminal of the power supply. The second piezoelectric ceramic sheet 303 connected to one end of R4 is also equivalent to being connected to the negative terminal of the power supply through the diode D2. Since the resistance value of R5 is one-tenth of that of R6, the voltage at point D (the steel sheet 302) is about +200V, which is equivalent to applying -200V voltage to the second piezoelectric ceramic sheet 303. At the same time, the voltage at point D is divided at point E through R3 and R4. Since the resistance values of R3 and R4 are equal, there is a voltage of -100V at point E relative to point D. This voltage is applied to the first piezoelectric ceramic sheet 301 of the piezoelectric output element 3 through R2 (since direct current does not generate current in the piezoelectric ceramic sheet, R2 only provides conduction and does not cause voltage drop). Thus, when the control switch is off, the second piezoelectric ceramic sheet 303 of the piezoelectric output element 3 is applied with the same-sign voltage of -200V, and the first piezoelectric ceramic sheet 301 is applied with the opposite-sign voltage of -100V. At this time, the piezoelectric output element 3 bends upward and the relay contact opens;

[0056] When the control switch is on, point D is connected to the negative terminal of the power supply, the triode Q is cut off, and the voltage at point C rises to +200V. It is applied to the first piezoelectric ceramic sheet 301 of the piezoelectric output element 3 through D3, and is also divided by R2 and R3 with equal resistance values to obtain a voltage of +100V relative to point D at point E. This voltage is applied to the second piezoelectric ceramic sheet 303 of the piezoelectric output element 3 through R4. At this time, the first piezoelectric ceramic sheet 301 is applied with the same-sign voltage of +200V, and the second piezoelectric ceramic sheet 303 is applied with the opposite-sign voltage of +100V. The piezoelectric output element 3 bends downward and deforms to push the contact to close.

[0057] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The other parts not detailed in the present invention belong to the prior art, so they will not be elaborated here. Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A piezoelectric ceramic relay, comprising a piezoelectric output element (3) and a drive circuit board (4) for driving the piezoelectric output element (3), characterized in that, It also includes a link mechanism (2) for triggering the relay function, a middle frame (1) forming the housing, a first cover plate (101), and a second cover plate (102); The piezoelectric output element (3) includes a first piezoelectric ceramic sheet (301) and a second piezoelectric ceramic sheet (303), and a steel sheet (302) is glued between the first piezoelectric ceramic sheet (301) and the second piezoelectric ceramic sheet (303). Both ends of the piezoelectric output element (3) are inserted into the inner walls at both ends of the middle frame (1); The link mechanism (2) includes a semi-circular support (201), a contact moving piece (203), a spring piece (206), and a contact static piece (209). One end of the semi-circular support (201) and one end of the spring piece (206) are both inserted into the inner wall of the middle frame (1). One end of the contact moving piece (203) is provided with a first arc bend (204), the first arc bend (204) is sleeved on the semi-circular support (201), and the end of the spring piece (206) is press-connected to the end of the first arc bend (204). A push block (304) is glued to the bottom end surface of the piezoelectric output element (3), and the push block (304) presses against the body of the contact moving piece (203).

2. The piezoelectric ceramic relay according to claim 1, wherein One end of the semi-circular support (201) is integrally connected with a first pin (202), the contact static piece (209) is integrally connected with a second pin (210), and the drive circuit board (4) is electrically connected with a third pin (401).

3. The piezoelectric ceramic relay according to claim 2, wherein, The first pin (202), the second pin (210), and two groups of third pins (401) vertically penetrate the bottom end of the middle frame (1), and the first pin (202), the second pin (210), and two groups of third pins (401) are symmetrically arranged about both ends of the middle frame (1). The inner wall of the middle frame (1) is provided with card slots (104) corresponding to the first pin (202), the second pin (210), two groups of third pins (401), the semi-circular support (201), and the spring piece (206).

4. The piezoelectric ceramic relay according to claim 3, characterized in that, Both ends of the steel sheet (302) protrude from the first piezoelectric ceramic sheet (301) and the second piezoelectric ceramic sheet (303), and both ends of the first piezoelectric ceramic sheet (301), the second piezoelectric ceramic sheet (303), and the steel sheet (302) are polished into an arc shape. The card slots (104) are arc-shaped grooves corresponding to both ends of the first piezoelectric ceramic sheet (301) and the second piezoelectric ceramic sheet (303), and the card slots (104) are triangular corresponding to both ends of the steel sheet (302).

5. A piezoelectric ceramic relay according to claim 1, characterized in that The contact static piece (209) and the piezoelectric output element (3) are both horizontally arranged, and the arc openings of the first arc bend (204) and the semi-circular support (201) are both upward. A second arc bend (205) is provided at the end of the first arc bend (204), and the arc surface of the second arc bend (205) contacts the bottom end surface of the spring piece (206).

6. The piezoelectric ceramic relay according to claim 5, wherein, A gasket (207) is arranged between the spring piece (206) and the semi-circular support (201), and a second screw (208) penetrates the spring piece (206), the gasket (207) and is threadedly connected to the semi-circular support (201).

7. A piezoelectric ceramic relay according to claim 1, characterized in that, A copper contact (211) is provided between the ends of the movable contact piece (203) and the stationary contact piece (209), and the end faces of the two groups of copper contacts (211) close to each other are both inclined.

8. A piezoelectric ceramic relay according to claim 1, characterized in that, Short columns (105) are provided at the four corners of the inner wall of the top end of the middle frame (1), and the four corners of the driving circuit board (4) are connected to the short columns (105) through third screws (402). The driving circuit board (4) is electrically connected to the piezoelectric output element (3) through a wire.

9. A piezoelectric ceramic relay according to claim 1, characterized in that, The first cover plate (101) and the second cover plate (102) are symmetrically distributed on both sides of the middle frame (1), and first screws (103) are provided at the four corners of the second cover plate (102). The four groups of first screws (103) penetrate the middle frame (1) and are respectively threadedly connected to the four corners of the first cover plate (101).

10. A piezoelectric ceramic relay according to claim 1, characterized in that, The initial charging polarization voltage of the first piezoelectric ceramic sheet (301) and the second piezoelectric ceramic sheet (303) is 600V, and the secondary polarization voltage of the piezoelectric output element (3) is 1200V.

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