High-frequency high-precision dispensing device and application method thereof

Abstract

The invention relates to the technical field of dispensing devices, in particular to a high-frequency and high-precision dispensing device and an application method.The high-frequency and high-precision dispensing device comprises a driving shell and a liquid supply base installed on the outer wall of the driving shell, a spray head is fixedly installed on the liquid supply base, a liquid supply channel is formed in the liquid supply base, and one end of the liquid supply channel communicates with the spray head; a piezoelectric element and a frame are installed in the driving shell, a push rod is fixedly installed on the piezoelectric element and penetrates through the frame in a sliding mode, a driving block is installed in the frame, a plurality of elastic pieces are fixedly installed between the side, away from the push rod, of the driving block and the inner wall of the frame, and the elastic pieces are gradually away from the liquid supply base from the side close to the driving block to the other side and are obliquely arranged. A piston rod abuts against the side, close to the liquid supply base, of the driving block, the piston rod slidably penetrates through the frame and the liquid supply base to enter the liquid supply channel, and the piston rod is sleeved with a spring. The dispensing device has the effect of improving the dispensing precision.

Description

Technical Field

[0001] This application relates to the technical field of dispensing devices, and in particular to a high-frequency and high-precision dispensing device and an application method thereof. Background Art

[0002] Dispensing technology plays a crucial role in modern industrial production, especially in the fields of electronics, optics, and precision manufacturing. With the development of electronic products towards miniaturization and lightweight, higher requirements are put forward for the accuracy and efficiency of the dispensing process.

[0003] Currently, the existing technology generally adopts a design scheme combining piezoelectric drive technology with elastic elements. A common method is to use a piezoelectric element to drive a piston rod to reciprocate. However, the driving distance of the piezoelectric element is short, and it is also necessary to amplify the displacement of the piezoelectric element through an elastic hinge and then drive the piston rod.

[0004] However, after the elastic hinge rotates frequently, it will wear, and the rotation part of the elastic hinge will become loose after wearing, so that the dispensing device will vibrate during operation, thereby affecting the dispensing accuracy. Summary of the Invention

[0005] In order to improve the dispensing accuracy, this application provides a high-frequency and high-precision dispensing device and an application method thereof.

[0006] A high-frequency and high-precision dispensing device and an application method thereof provided by this application adopt the following technical solutions: A high-frequency and high-precision dispensing device includes a driving housing and a liquid supply base installed on the outer wall of the driving housing. The liquid supply base is fixedly installed with a nozzle. A liquid supply channel is opened inside the liquid supply base. One end of the liquid supply channel is communicated with the nozzle, and the other end of the liquid supply channel is used for liquid to flow in. A piezoelectric element and a frame are installed inside the driving housing. The piezoelectric element is fixedly installed with a push rod. The push rod slides through the frame. A driving block is installed inside the frame. The piezoelectric element pushes the driving block to move through the push rod. A plurality of elastic sheets are fixedly installed between the side of the driving block away from the push rod and the inner wall of the frame. The elastic sheets are inclined gradually from the side close to the driving block to the other side away from the liquid supply base. The side of the driving block close to the liquid supply base is abutted against a piston rod. The piston rod slides through the frame and the liquid supply base and enters the liquid supply channel. A spring is sleeved on the piston rod. The spring is used to drive the piston rod to move towards the driving block. The driving block is used to push the piston rod to approach or move away from the nozzle.

[0007] By adopting the above technical solution, the design of the liquid supply channel enables the liquid to flow precisely into the nozzle. The piezoelectric element pushes the driving block to move through the push rod, combined with the inclined setting of the elastic sheet, thus facilitating the reciprocating movement of the piston rod. At the same time, for the parts in contact between the driving block and the push rod, and between the driving block and the piston rod of the present application, after wear, the driving distance of the piezoelectric element is increased, so as to reattach and maintain the original pressing force, thereby reducing the occurrence of vibration during the operation of the dispensing device and improving the dispensing accuracy.

[0008] Optionally, a push plate is fixedly installed at one end of the push rod away from the piezoelectric element. A receiving groove is formed on one side of the driving block close to the push rod. A plurality of rotating rods are arranged inside the receiving groove, and the rod bodies of the rotating rods abut against the push plate.

[0009] By adopting the above technical solution, the setting of the push plate can more stably transfer the linear motion of the push rod to the driving block, avoiding the possible wear or deviation problems caused by the direct contact between the push rod and the driving block. The plurality of rotating rods arranged inside the receiving groove can achieve uniform force transmission by abutting their rod bodies against the push plate, while reducing the frictional resistance, improving the smoothness and response speed of the driving block movement, and thus enhancing the accuracy and reliability of the dispensing device in the high-frequency working state.

[0010] Optionally, a plurality of partition plates are fixedly installed inside the receiving groove. Each rotating rod corresponds to two partition plates. The rotating rod is located between the two partition plates. A plurality of rotating grooves for the rotating rods to enter are formed on the side of the push plate away from the piezoelectric element. The side of the rotating groove close to the liquid supply seat is arc-shaped.

[0011] By adopting the above technical solution, the partition plates divide the internal space of the receiving groove into multiple independent areas, enabling each rotating rod to rotate stably in its respective area, effectively avoiding the mutual interference between the rotating rods, and significantly improving the accuracy and stability of the transmission process. At the same time, the arc-shaped design of the side of the rotating groove close to the liquid supply seat can increase the displacement distance when the push plate contacts the rotating rod, thereby increasing the overall stroke of the driving block driving the piston rod to move.

[0012] Optionally, a heat-dissipating resin layer is fixedly installed on the outer peripheral wall of the piezoelectric element. A heat-dissipating sleeve is wrapped outside the heat-dissipating resin layer. One end of the heat-dissipating sleeve is connected to the frame body, and the other end of the heat-dissipating sleeve is blocked. A radiator is fixedly installed on the outer wall of the heat-dissipating sleeve.

[0013] By adopting the above technical solution, the heat dissipation resin layer can effectively conduct the heat generated during the operation of the piezoelectric element, avoiding the accumulation of heat inside the piezoelectric element, thereby improving the working stability and lifespan of the piezoelectric element. The heat dissipation sleeve further guides the heat to the outside. Combining with the heat dissipation effect of the radiator, an efficient heat dissipation effect is achieved, ensuring that the temperature of the dispensing device under high-frequency working conditions is within a controllable range, and improving the operating efficiency and reliability of the overall device.

[0014] Optionally, a reinforcing spring is sleeved on the push rod, and the reinforcing spring abuts against the frame body and the piezoelectric element.

[0015] By adopting the above technical solution, the setting of the reinforcing spring can enhance the stability of the push rod during the reciprocating motion, effectively reducing the vibration and displacement deviation of the push rod caused by high-frequency driving.

[0016] Optionally, a cover plate is provided at one end of the heat dissipation sleeve away from the frame body. A support block is fixedly installed on the cover plate, and the support block is threadedly inserted into the heat dissipation sleeve.

[0017] By adopting the above technical solution, the setting of the cover plate can block one end of the heat dissipation sleeve away from the frame body, reducing the entry of impurities into the interior of the heat dissipation sleeve. At the same time, rotating the cover plate drives the piezoelectric element to slide inside the heat dissipation sleeve, thereby adjusting the pressing force of the piezoelectric element on the push rod, and further compensating for the frictional loss between the push rod and the driving block.

[0018] Optionally, mounting grooves for the elastic sheet to enter are provided on the inner wall of the frame body and on the side of the driving block away from the push rod, and the elastic sheet is fixedly connected to the inner wall of the mounting groove.

[0019] By adopting the above technical solution, the elastic sheet is fixedly installed in the mounting grooves of the driving block and the frame body. This structural design enables the elastic sheet to maintain a stable position during operation, avoiding problems such as displacement or detachment of the elastic sheet caused by vibration or high-frequency driving. At the same time, the inclined setting of the elastic sheet fits more closely with the driving block, and can achieve a fast and precise displacement amplification effect under the drive of the piezoelectric element, thereby improving the response speed and dispensing accuracy of the dispensing device. In addition, the fixing method of the elastic sheet also helps to improve the reliability and service life of the overall device.

[0020] Optionally, the liquid supply seat is provided with a first sliding hole for the piston rod to pass through. The first sliding hole is communicated with the liquid supply channel. The inner wall of the first sliding hole abuts against the piston rod, and a sealing ring is embedded along the edge of the position where the first sliding hole is located on the inner wall of the liquid supply channel.

[0021] By adopting the above technical solution, when the piston rod slides in the first sliding hole in the liquid supply seat, the inner wall of the first sliding hole is in close contact with the piston rod, which can effectively reduce the possibility of liquid leakage. At the same time, the sealing ring embedded at the edge of the first sliding hole on the inner wall of the liquid supply channel further enhances the sealing performance and reduces the occurrence of leakage during the transmission of glue in the liquid supply channel.

[0022] Optionally, the liquid supply seat is provided with a second sliding hole for the piston rod to pass through. The second sliding hole is communicated with the liquid supply channel. A sealing sleeve is fixedly installed inside the second sliding hole. The barrel wall of the sealing sleeve is of a hollow structure. A sliding layer is arranged inside the barrel wall of the sealing sleeve. A clamping block is fixedly installed on the inner wall of the sealing sleeve. A clamping groove for the clamping block to enter is formed on the rod body of the piston rod.

[0023] By adopting the above technical solution, the sealing sleeve arranged inside the second sliding hole can form a good sealing effect on the piston rod. A sliding layer is arranged inside the hollow barrel wall of the sealing sleeve, so that the inner wall of the sealing sleeve can move along with the piston rod conveniently, thereby reducing the resistance of the piston rod sliding inside the second sliding hole.

[0024] An application method of a high-frequency and high-precision dispensing device includes the following steps: Apply a first voltage to the piezoelectric element to stretch the piezoelectric element; the stretching of the piezoelectric element drives the driving block to squeeze the elastic sheet; the elastic sheet is squeezed by the driving block and drives the driving block to move towards the liquid supply seat; the driving block moves towards the liquid supply seat and drives the piston rod to move downward to block the nozzle; apply a second voltage to the piezoelectric element to contract the piezoelectric element; the contraction of the piezoelectric element restores the elastic sheet and drives the driving block to move away from the liquid supply seat; the spring restores and drives the piston rod to move upward to open the nozzle By adopting the above technical solution, the piezoelectric element stretches under the action of the first voltage, the driving block squeezes the elastic sheet and drives the piston rod to move downward to block the nozzle, realizing the precise closing of the glue; the piezoelectric element contracts under the action of the second voltage, the elastic sheet restores and drives the driving block to move away from the liquid supply seat, and the spring restores and drives the piston rod to move upward to open the nozzle, realizing the precise release of the glue. This method can effectively reduce the influence brought by the vibration of the elastic hinge, reduce the load of the piezoelectric element and the controller, and improve the high-frequency driving performance and dispensing accuracy of the dispensing device.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. By directly driving the push rod by the piezoelectric element and combining with the elastic sheet structure, the use of the traditional elastic hinge is reduced, thereby reducing the vibration problem caused by the wear of the elastic hinge and improving the working stability and dispensing accuracy of the dispensing device; 2. When the pressing element drives the driving block to move horizontally through the push rod, the inclination of the elastic piece can expand the horizontal movement of the driving block and convert it into a lifting movement, so as to facilitate driving the piston rod to block or open the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the schematic diagram of the overall structure of Embodiment 1 of the present application; Figure 2 is the cross-sectional view of the overall structure of Embodiment 1 of the present application; Figure 3 is the schematic diagram of the structure between the driving block and the piston rod of Embodiment 1 of the present application; Figure 4 is Figure 2 the enlarged view at A; Figure 5 is the cross-sectional view of the overall structure of Embodiment 2 of the present application; Figure 6 is Figure 5 the enlarged view at B; Figure 7 is Figure 5 the enlarged view at C.

[0027] Description of the reference numerals: 1, driving housing; 2, liquid supply seat; 3, nozzle; 4, liquid supply channel; 5, frame; 6, piezoelectric element; 7, heat dissipation resin layer; 8, heat dissipation sleeve; 9, cover plate; 10, support block; 11, push rod; 12, strengthening spring; 13, radiator; 14, driving block; 15, receiving groove; 16, rotating rod; 17, push plate; 18, elastic piece; 19, installation groove; 20, piston rod; 21, first sliding hole; 22, spring; 23, driving ring; 24, sealing ring; 25, partition plate; 26, rotating groove; 27, second sliding hole; 28, sealing sleeve; 29, sliding layer; 30, clamping block; 31, clamping groove; 32, heater. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following Figures 1-7 further describes the present application in detail with reference to the

[0029] Embodiment 1 Embodiment 1 of the present application discloses a high-frequency and high-precision dispensing device and its application method.

[0030] Refer to Figure 1 、 Figure 2, A high-frequency and high-precision dispensing device, including a driving housing 1 and a liquid supply base 2 installed on the outer wall of the driving housing 1. A nozzle 3 is fixedly installed on one side of the liquid supply base 2 away from the driving housing 1, and a liquid supply channel 4 is opened inside the liquid supply base 2. One end of the liquid supply channel 4 is communicated with the nozzle 3, and the other end of the liquid supply channel 4 is used for liquid to flow in. The liquid enters from the liquid supply channel 4 and is ejected from the nozzle 3, thereby realizing the dispensing operation.

[0031] The liquid supply base 2 is also installed with a heater 32, and the heater 32 is used to heat the liquid inside the liquid supply channel 4 to reduce the occurrence of liquid condensation.

[0032] Refer to Figure 2 , A frame 5 is fixedly installed inside the driving housing 1, and a piezoelectric element 6 is also arranged inside the driving housing 1. A heat dissipation resin layer 7 is fixedly installed on the outer peripheral wall of the piezoelectric element 6, and a heat dissipation sleeve 8 is wrapped outside the heat dissipation resin layer 7. One end of the heat dissipation sleeve 8 is connected to the frame 5, and a cover plate 9 is arranged at the other end of the heat dissipation sleeve 8. The cover plate 9 is fixedly installed with a support block 10, and the support block 10 is threadedly penetrated through the heat dissipation sleeve 8. A radiator 13 is fixedly installed on the outer wall of the heat dissipation sleeve 8. The piezoelectric element 6 is dissipated heat through the heat dissipation resin layer 7, the heat dissipation sleeve 8 and the radiator 13, thereby prolonging the service life of the piezoelectric element 6, and also improving the driving stability and accuracy of the piezoelectric element 6.

[0033] Refer to Figure 2 , A push rod 11 is fixedly installed on the side of the piezoelectric element 6 away from the support block 10, and the push rod 11 slides through the driving housing 1. A strengthening spring 12 is sleeved on the push rod 11, and the strengthening spring 12 presses the piezoelectric element 6 against the support block 10. At the same time, rotate the cover plate 9, and the cover plate 9 drives the piezoelectric element 6 to move through the support block 10, thereby facilitating the adjustment of the position of the piezoelectric element 6 inside the heat dissipation sleeve 8.

[0034] Refer to Figure 2 , Figure 3 , A driving block 14 is arranged inside the frame 5. A receiving groove 15 is opened on the side of the driving block 14 close to the push rod 11, and a plurality of rotating rods 16 are arranged inside the receiving groove 15. A push plate 17 is fixedly installed at the end of the push rod 11 away from the piezoelectric element 6, and the rod body of the rotating rod 16 abuts against the push plate 17.

[0035] The piezoelectric element 6 drives the push rod 11 to move in the horizontal direction, and the push rod 11 drives the driving block 14 to move in the horizontal direction through the push plate 17 and the rotating rods 16. When the driving block 14 moves in the height direction, the rotating rods 16 rotate, thereby reducing wear.

[0036] The upper part of the side of the driving block 14 away from the push rod 11 is inclined, and the lower part of the side of the driving block 14 away from the push rod 11 is inclined. The inner wall of the frame 5 is arranged to match the peripheral shape of the driving block 14.

[0037] Refer to Figure 2 and Figure 3 A plurality of elastic pieces 18 are arranged between the side of the driving block 14 away from the push rod 11 and the inner wall of the frame body 5. Installation grooves 19 for the elastic pieces 18 to enter are formed in both the side of the driving block 14 away from the push rod 11 and the inner wall of the frame body 5, and the elastic pieces 18 are fixedly connected to the inner walls of the installation grooves 19. The side of the elastic piece 18 close to the driving block 14 is gradually inclined away from the liquid supply base 2 from one side to the other side, and the inclination angle of the elastic piece 18 in the upper part of the driving block 14 is greater than that of the elastic piece 18 in the lower part.

[0038] When the piezoelectric element 6 drives the driving block 14 to horizontally move and squeeze the elastic piece 18, the elastic piece 18 further inclines, thereby driving the driving block 14 to descend; when the piezoelectric element 6 drives the driving block 14 to horizontally move and release the elastic piece 18, the elastic piece 18 restores, thereby driving the driving block 14 to ascend. And the horizontal movement distance of the driving block 14 is less than the movement distance in the height direction, thereby playing a magnifying role.

[0039] Refer to Figure 2 and Figure 4 A piston rod 20 is abutted and arranged on the side of the driving block 14 close to the liquid supply base 2. A first sliding hole 21 is formed in the side of the liquid supply base 2 close to the driving housing 1. The piston rod 20 slidably penetrates through the frame body 5 and then enters the first sliding hole 21, and the first sliding hole 21 is communicated with the liquid supply channel 4. When the driving block 14 drives the piston rod 20 to descend, the piston rod 20 enters the nozzle 3, thereby blocking the nozzle 3 to stop dispensing glue.

[0040] Refer to Figure 2 Two springs 22 are sleeved on the piston rod 20, and a driving ring 23 is fixedly sleeved on the piston rod 20. The driving ring 23 is located outside the frame body 5 and inside the driving housing 1. One spring 22 is fixedly installed between the driving ring 23 and the liquid supply base 2. When the driving block 14 ascends, the spring 22 squeezes the driving ring 23, thereby causing the piston rod 20 to ascend and open the nozzle 3. The other spring 22 is located inside the frame body 5, and the spring 22 is located between the frame body 5 and the driving block 14. The spring 22 pushes the driving block 14 to ascend, thereby facilitating the ascent of the driving block 14.

[0041] Refer to Figure 2 and Figure 4 The inner wall of the first sliding hole 21 abuts against the piston rod 20, and a sealing ring 24 is embedded along the edge of the position where the first sliding hole 21 is located on the inner wall of the liquid supply channel 4. The sealing ring 24 plays a sealing role, thereby reducing the occurrence of liquid leakage from the liquid supply base 2.

[0042] An application method of a high-frequency and high-precision dispensing device is applied to a high-frequency and high-precision dispensing device of the present application, including the following methods: Apply a first voltage to the piezoelectric element 6 to stretch the piezoelectric element 6; The piezoelectric element 6 stretches to drive the driving block 14 to squeeze the elastic piece 18; The elastic piece 18 is squeezed by the driving block 14 and drives the driving block 14 to move towards the liquid supply base 2; The movement of the driving block 14 towards the liquid supply base 2 drives the piston rod 20 to move downward to block the nozzle 3; Apply a second voltage to the piezoelectric element 6 to cause the piezoelectric element 6 to contract; The contraction of the piezoelectric element 6 causes the elastic piece 18 to recover and drives the driving block 14 to move away from the liquid supply base 2; The spring 22 recovers and drives the piston rod 20 to move upward to open the nozzle 3.

[0043] The implementation principle of a high-frequency and high-precision dispensing device and its application method in an embodiment of the present application is as follows: When the piezoelectric element 6 is energized, by continuously changing the voltage, the piezoelectric element 6 drives the push rod 11 to reciprocate horizontally. When the push rod 11 reciprocates, it drives the driving block 14 to reciprocate horizontally.

[0044] When the driving block 14 moves horizontally away from the piezoelectric element 6, the driving block 14 squeezes the elastic piece 18, and the elastic piece 18 further tilts, so that the driving block 14 descends. When the driving block 14 moves horizontally close to the piezoelectric element 6, the driving block 14 releases the elastic piece 18, the elastic piece 18 recovers, and the elastic piece 18 and the spring 22 drive the driving block 14 to rise, thereby realizing the reciprocating lifting of the driving block 14.

[0045] When the driving block 14 reciprocates up and down, the rotating rod 16 rolls on the push plate 17, thereby reducing the resistance that the driving block 14 needs to overcome during lifting, facilitating the lifting of the driving block 14, and reducing frictional losses at the same time.

[0046] The lifting of the driving block 14 drives the piston rod 20 to lift, so that the piston rod 20 blocks or opens the spraying, facilitating the dispensing operation.

[0047] Compared with the existing elastic hinge driving the piston rod 20 to move, after the existing elastic hinge wears, the rotating part of the elastic hinge will become loose, resulting in vibration, which affects the dispensing accuracy. Between the driving block 14 and the push rod 11, and between the driving block 14 and the piston rod 20 of the present application, after wear, the elastic piece 18 drives the driving block 14 to continue to tightly abut against the push rod 11, and the spring 22 drives the piston rod 20 to continue to tightly abut against the driving block 14, thereby reducing the occurrence of vibration and improving the dispensing accuracy. At the same time, after adjusting the voltage of the piezoelectric element 6 in the present application, the wear can be compensated, thereby increasing the service life of the dispensing device.

[0048] Embodiment 2 An embodiment of the present application discloses a high-frequency and high-precision dispensing device and its application method.

[0049] Refer to Figure 5 、Figure 6 , Figure 7 , the difference between a high-frequency and high-precision dispensing device according to an embodiment of the present application and that of Embodiment 1 is that a plurality of partition plates 25 are fixedly installed inside the accommodating groove 15, and each rotating rod 16 corresponds to two partition plates 25, and the rotating rod 16 is located between the two partition plates 25. A plurality of rotating grooves 26 for the rotating rod 16 to enter are formed on the side of the push plate 17 away from the piezoelectric element 6, and the side of the rotating groove 26 close to the liquid supply base 2 is arc-shaped.

[0050] The liquid supply base 2 is provided with a second sliding hole 27 for the piston rod 20 to pass through, and the second sliding hole 27 communicates with the liquid supply channel 4. A sealing sleeve 28 is fixedly installed inside the second sliding hole 27. The length of the sealing sleeve 28 is less than that of the second sliding hole 27, and the inner wall of the part of the second sliding hole 27 longer than the sealing sleeve 28 abuts against the piston rod 20. The barrel wall of the sealing sleeve 28 is of a hollow structure, and a sliding layer 29 is arranged inside the barrel wall of the sealing sleeve 28. The sliding layer 29 is water, oil, talcum powder or the like. A clamping block 30 is fixedly installed on the inner wall of the sealing sleeve 28, and a clamping groove 31 for the clamping block 30 to enter is formed on the rod body of the piston rod 20.

[0051] The implementation principle of a high-frequency and high-precision dispensing device and its application method according to an embodiment of the present application is as follows: The driving block 14 drives the rotating rod 16 to lift together through the partition plate 25. The rotating rod 16 is guided by the arc-shaped inner wall of the rotating groove 26, which is beneficial to further push the driving block 14 to move in the horizontal direction, thereby increasing the moving distance of the driving block 14 in the horizontal direction, and further reducing the size of the piezoelectric element 6.

[0052] The clamping block 30 is clamped with the inner wall of the clamping groove 31, so that the inner wall of the sealing sleeve 28 will lift with the piston rod 20, thereby reducing the occurrence of friction leakage between the piston rod 20 and the sealing sleeve 28.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A high-frequency and high-precision dispensing device, characterized in that: The invention comprises a driving housing (1) and a liquid supply seat (2) mounted on the outer wall of the driving housing (1), wherein a nozzle (3) is fixedly mounted on the liquid supply seat (2), a liquid supply channel (4) is provided inside the liquid supply seat (2), one end of the liquid supply channel (4) is communicated with the nozzle (3), and the other end of the liquid supply channel (4) is used for liquid to flow in, a piezoelectric element (6) and a frame (5) are mounted inside the driving housing (1), a push rod (11) is fixedly mounted on the piezoelectric element (6), the push rod (11) slides through the frame (5), a driving block (14) is mounted inside the frame (5), the piezoelectric element (6) pushes the driving block (14) to move through the push rod (11), and the driving block (14) is driven by the piezoelectric element (6) to move. A plurality of spring sheets (18) are fixedly mounted between a side of the driving block (14) away from the push rod (11) and an inner wall of the frame (5); the spring sheets (18) are arranged in an inclined manner from one side close to the driving block (14) to the other side, gradually away from the liquid supply seat (2); a piston rod (20) is arranged in contact with a side of the driving block (14) close to the liquid supply seat (2); the piston rod (20) slides through the frame (5) and the liquid supply seat (2) and enters the liquid supply channel (4); a spring (22) is sleeved on the piston rod (20); the spring (22) is used to drive the piston rod (20) to move toward the driving block (14); and the driving block (14) is used to push the piston rod (20) to approach or move away from the spray head (3).

2. A high-frequency and high-precision dispensing device according to claim 1, characterized in that: A push plate (17) is fixedly mounted on one end of the push rod (11) away from the piezoelectric element (6), and a receiving groove (15) is provided on a side of the driving block (14) close to the push rod (11). A plurality of rotating rods (16) are arranged inside the receiving groove (15), and the rod bodies of the rotating rods (16) are in contact with the push plate (17).

3. A high-frequency and high-precision dispensing device according to claim 2, characterized in that: A plurality of partitions (25) are fixedly installed inside the accommodating groove (15), each of the rotating rods (16) corresponds to two partitions (25), and the rotating rod (16) is located between the two partitions (25). A plurality of rotating grooves (26) for the rotating rods (16) to enter are formed on a side of the push plate (17) away from the piezoelectric element (6), and the rotating grooves (26) are arc-shaped on a side close to the liquid supply seat (2).

4. The high-frequency and high-precision dispensing device according to claim 1, characterized in that: A heat dissipation resin layer (7) is fixedly mounted on the outer peripheral wall of the piezoelectric element (6), a heat dissipation sleeve (8) is wrapped around the heat dissipation resin layer (7), one end of the heat dissipation sleeve (8) is connected to the frame (5), the other end of the heat dissipation sleeve (8) is sealed, and a heat sink (13) is fixedly mounted on the outer wall of the heat dissipation sleeve (8).

5. A high-frequency and high-precision dispensing device according to claim 4, characterized in that: The push rod (11) is sleeved with a reinforcing spring (12), and the reinforcing spring (12) is tightly pressed against the frame (5) and the piezoelectric element (6).

6. A high-frequency and high-precision dispensing device according to claim 5, characterized in that: A cover plate (9) is provided at one end of the heat dissipation sleeve (8) away from the frame (5); a support block (10) is fixedly mounted on the cover plate (9); and the support block (10) is threadedly plugged into the heat dissipation sleeve (8).

7. The high-frequency and high-precision dispensing device according to claim 1, characterized in that: A mounting groove (19) for the spring sheet (18) to enter is provided on a side of the driving block (14) away from the push rod (11) and on the inner wall of the frame (5), and the spring sheet (18) is fixedly connected to the inner wall of the mounting groove (19).

8. The high-frequency and high-precision dispensing device according to claim 1, characterized in that: The liquid supply seat (2) is provided with a first sliding hole (21) for the piston rod (20) to pass through, the first sliding hole (21) is connected to the liquid supply channel (4), the inner wall of the first sliding hole (21) is in contact with the piston rod (20), and a sealing ring (24) is embedded on the inner wall of the liquid supply channel (4) along the edge of the first sliding hole (21).

9. The high-frequency and high-precision dispensing device according to claim 1, characterized in that: The liquid supply seat (2) is provided with a second sliding hole (27) for the piston rod (20) to pass through, the second sliding hole (27) being in communication with the liquid supply channel (4), a sealing sleeve (28) being fixedly installed inside the second sliding hole (27), the cylinder wall of the sealing sleeve (28) being a hollow structure, a sliding layer (29) being provided inside the cylinder wall of the sealing sleeve (28), a clamping block (30) being fixedly installed on the inner wall of the sealing sleeve (28), and a clamping groove (31) for the clamping block (30) to enter into the rod body of the piston rod (20).

10. An application method of a high-frequency and high-precision dispensing device, applied to a high-frequency and high-precision dispensing device described in any one of Examples 1-9 of the present application, characterized in that: The following methods are included: Applying a first voltage to the piezoelectric element (6) to stretch the piezoelectric element (6); The piezoelectric element (6) stretches and drives the driving block (14) to squeeze the spring sheet (18); The spring sheet (18) is squeezed by the driving block (14) to drive the driving block (14) to move toward the liquid supply seat (2); The driving block (14) moves toward the liquid supply seat (2) to drive the piston rod (20) to move downward to block the nozzle (3); Applying a second voltage to the piezoelectric element (6) to cause the piezoelectric element (6) to contract; The piezoelectric element (6) contracts to restore the spring sheet (18) and drive the driving block (14) to move away from the liquid supply seat (2); The spring (22) returns to its original position, driving the piston rod (20) to move upward to open the spray head (3).

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