Piezoelectric ceramic dispensing injection valve and dispensing equipment

Abstract

The utility model discloses a piezoelectric ceramic dispensing injection valve and dispensing equipment. The piezoelectric ceramic dispensing injection valve comprises a valve body, a firing pin, a lever, a piezoelectric ceramic stack and a limiting structure, the valve body is provided with a dispensing opening, and the firing pin can block the dispensing opening; the lever is provided with a first connecting part, a second connecting part and a third connecting part, the first connecting part is rotationally connected to the valve body, the second connecting part is connected to the end, deviating from the dispensing opening, of the firing pin, and the third connecting part is provided with a first arc surface; one end of the piezoelectric ceramic stack is connected to the valve body, and the other end of the piezoelectric ceramic stack is provided with a second arc surface which slidably abuts against the first arc surface; the limiting structure is used for limiting the first connecting part to move in the first direction, and the first direction is the axial direction of the second arc surface, so that the piezoelectric ceramic stack is prevented from being subjected to bending moment due to large-degree inclination in the first direction, and then the service life of the piezoelectric ceramic stack is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of glue dispensing, in particular to a piezoelectric ceramic glue dispensing injection valve and glue dispensing equipment. Background Art

[0002] The piezoelectric ceramic dispensing injection valve usually includes a valve body, a piezoelectric ceramic stack, a lever, a striker and a spring. The piezoelectric ceramic stack is deformed after being energized and cooperates with the spring to achieve the reciprocating swing of the lever, so that the striker moves to squeeze the glue liquid and the glue liquid is ejected from the nozzle. In some technologies, in order to facilitate installation, the two ends of the piezoelectric ceramic stack are respectively abutted against the valve body and the lever, wherein the piezoelectric ceramic stack and the lever are rotated in a cylindrical abutment manner. However, this method has the risk of lateral displacement and lateral force during the deformation process of the piezoelectric ceramic stack, thereby affecting the service life of the piezoelectric ceramic stack, and further resulting in a reduction in the service life of the piezoelectric ceramic dispensing injection valve. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a piezoelectric ceramic dispensing injection valve, which can have a longer service life.

[0004] The utility model also provides a glue dispensing device comprising the piezoelectric ceramic glue dispensing injection valve.

[0005] The piezoelectric ceramic dispensing injection valve according to the first embodiment of the utility model includes: a valve body, a striker, a lever, a piezoelectric ceramic stack and a limiting structure.

[0006] The valve body has an installation cavity, a flow channel and a dispensing port, and the flow channel is connected to the dispensing port; the striker is movably arranged in the installation cavity and can block the dispensing port; the lever is arranged in the installation cavity, and the lever has a first connection part, a second connection part and a third connection part, the first connection part is rotatably connected to the valve body, the second connection part is connected to the end of the striker away from the dispensing port, the third connection part is located between the first connection part and the second connection part, and the end face of the third connection part away from the striker is a first arc surface; the piezoelectric ceramic stack The stack is arranged in the installation cavity, and the two ends of the piezoelectric ceramic stack respectively include a fourth connecting part and a fifth connecting part, the fourth connecting part is connected to the valve body, and the fifth connecting part has a second arc surface adapted to the first arc surface, and the second arc surface is slidably abutted with the first arc surface; the limiting structure includes a first limiting part and a second limiting part, the first limiting part and the second limiting part are respectively located on the opposite sides of the fifth connecting part along the first direction, and are used to limit the movement of the fifth connecting part along the first direction, and the first direction is the axial direction of the second arc surface.

[0007] The piezoelectric ceramic dispensing injection valve according to the embodiment of the utility model has at least the following beneficial effects:

[0008] In this embodiment, a limiting structure is provided, and the first limiting portion and the second limiting portion of the limiting structure are respectively provided on both sides of the piezoelectric ceramic stack along the first direction, and are used to limit the movement of the piezoelectric ceramic stack in the first direction to prevent the piezoelectric ceramic stack from tilting to a large extent in the first direction and being subjected to bending moment, thereby ensuring the service life of the piezoelectric ceramic stack, so that the piezoelectric ceramic dispensing injection valve has a longer service life.

[0009] According to some embodiments of the present utility model, the limiting structure and the lever are an integrated structure.

[0010] According to some embodiments of the present invention, the fourth connection portion is rotatably connected to the valve body, and a rotation axis between the fourth connection portion and the valve body is parallel to an axis of the second arc surface.

[0011] According to some embodiments of the present utility model, the end of the fourth connecting portion facing away from the fifth connecting portion has a spherical surface, and the spherical surface is used for spherical connection with the valve body;

[0012] Along the first direction, the size of the fifth connecting portion is L 1 , the distance between the first limiting portion and the second limiting portion is L 2 , 0.1mm≤L 2 -L 1 ≤0.2mm; or

[0013] The first limiting portion and the second limiting portion are both connected to the fifth connecting portion, the third connecting portion is located between the first limiting portion and the second limiting portion, and the size of the third connecting portion along the first direction is L 3 , the distance between the first limiting portion and the second limiting portion is L 4 , 0.1mm≤L 4 -L 3 ≤0.2mm.

[0014] According to some embodiments of the present invention, the piezoelectric ceramic stack includes a ceramic stack body, a first connecting member and a second connecting member, the first connecting member and the second connecting member are both wear-resistant structures, the first connecting member includes the fourth connecting portion, and the second connecting member includes the fifth connecting portion.

[0015] According to some embodiments of the present invention, the end surface of the second connecting portion facing the striker is a third arc surface, and the third arc surface is in sliding contact with the striker.

[0016] According to some embodiments of the utility model, the piezoelectric ceramic dispensing injection valve also includes a first elastic member and a second elastic member, one end of the first elastic member is connected to the valve body, and the other end is connected to the striker, and is used to apply a force to the striker away from the dispensing port, one end of the second elastic member is connected to the side of the lever facing the striker, and the other end is connected to the valve body, and the second elastic member is used to apply a force to the lever away from the striker.

[0017] According to some embodiments of the present invention, the first elastic member and the second elastic member are both compression springs, the first elastic member is sleeved on the outside of the firing pin, and the second elastic member is sleeved on the outside of the first elastic member.

[0018] The dispensing device according to the second embodiment of the utility model includes the piezoelectric ceramic dispensing injection valve described in the first embodiment.

[0019] The dispensing device according to the embodiment of the utility model has at least the following beneficial effects:

[0020] A piezoelectric ceramic dispensing injection valve of the first aspect embodiment is adopted, and the piezoelectric ceramic dispensing injection valve includes a limiting structure, and the first limiting portion and the second limiting portion of the limiting structure are respectively arranged on both sides of the piezoelectric ceramic stack along the first direction, for limiting the movement of the piezoelectric ceramic stack in the first direction to prevent the piezoelectric ceramic stack from tilting to a large extent in the first direction and being subjected to bending moment, thereby ensuring the service life of the piezoelectric ceramic stack, so that the piezoelectric ceramic dispensing injection valve has a longer service life, so as to improve the service life of the dispensing equipment of this embodiment.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a piezoelectric ceramic dispensing injection valve according to an embodiment of the first aspect of the utility model;

[0024] Figure 2 for Figure 1 A cross-sectional view of

[0025] Figure 3 for Figure 2 A magnified schematic diagram of the middle A area;

[0026] Figure 4 for Figure 1 Another cross-sectional view of

[0027] Figure 5 for Figure 4 Magnified view of area B;

[0028] Figure 6 for Figure 4 Schematic diagram of the structure of the medium piezoelectric ceramic stack;

[0029] Figure 7 for Figure 6 Schematic diagram from another perspective.

[0030] Reference numerals:

[0031] Valve body 100, main body 101, flow channel 102, mounting cavity 110, flow channel 120, dispensing port 130, rotating part 140;

[0032] Strike pin 200, protrusion 210;

[0033] A first elastic member 300;

[0034] Lever 400, first connection portion 410, rotation slot 411, second connection portion 420, third arc surface 421, third connection portion 430, first arc surface 431;

[0035] Piezoelectric ceramic stack 500, ceramic stack body 501, first connecting member 502, second connecting member 503, fourth connecting portion 510, spherical surface 511, fifth connecting portion 520, second arc surface 521;

[0036] The limiting structure 600, the first limiting portion 610, and the second limiting portion 620;

[0037] A second elastic member 700 and a guide member 800 . DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0042] The piezoelectric ceramic dispensing injection valve usually includes a valve body, a piezoelectric ceramic stack, a lever, a striker and a spring. The piezoelectric ceramic stack is deformed after being energized and the spring cooperates to realize the reciprocating swing of the lever, so that the striker moves to squeeze the glue liquid and the glue liquid is ejected from the nozzle. In some technologies, the piezoelectric ceramic stack and the lever are rotated in a manner of cylindrical abutment. However, in this manner of cooperation, during the deformation process of the piezoelectric ceramic stack, there is a possibility that the end of the piezoelectric ceramic stack will shift sideways relative to the lever, causing the piezoelectric ceramic to be subjected to bending moment, which affects the service life of the piezoelectric ceramic stack and thus reduces the service life of the piezoelectric ceramic dispensing injection valve.

[0043] Based on the above problems, this embodiment proposes a piezoelectric ceramic dispensing injection valve, in which a limiting structure 600 is set on both sides of the piezoelectric ceramic stack 500 to limit the movement of the piezoelectric ceramic stack 500, thereby preventing the piezoelectric ceramic stack 500 from being displaced to a large extent relative to the lever 400. Figures 1 to 5 , Figure 1 This is a schematic diagram of the structure of a piezoelectric ceramic dispensing injection valve according to the first embodiment of the utility model. Figure 2 for Figure 1 A cross-sectional view of Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle. Figure 4 for Figure 1 Another cross-sectional view of Figure 5 for Figure 4 The enlarged view of the area B in the middle shows that the piezoelectric ceramic dispensing injection valve of this embodiment includes: a valve body 100, a striker 200, a lever 400, a piezoelectric ceramic stack 500 and a limiting structure 600.

[0044] The valve body 100 has a mounting cavity 110, a flow channel 120 and a dispensing port 130, the flow channel 120 is connected to the dispensing port 130, and the flow channel 120 is used to communicate with the glue supply device to guide the liquid glue to the dispensing port 130. The valve body 100 is, for example, an integral structure, the mounting cavity 110 and the flow channel 120 are both formed in one structure, or the valve body 100 includes a main body 101 and a flow channel 102, the main body 101 has a mounting cavity 110, the flow channel 102 has a flow channel 120 and a dispensing port 130 connected to the flow channel 120, and the flow channel 102 is connected to the main body 101. In addition, the flow channel 102 is detachably connected to the main body 101, so that when the flow channel 102 is blocked after long-term use, or when the connection with the external glue supply device is worn, it can be replaced separately for maintenance, so that the maintenance cost of the piezoelectric ceramic dispensing injection valve of this embodiment is lower.

[0045] The striker 200 is movably disposed in the mounting cavity 110 and is capable of blocking the dispensing port 130. For example, the mounting cavity 110 includes a mounting hole, the diameter of the mounting hole is adapted to the diameter of the striker 200, the striker 200 is disposed in the mounting hole and is capable of moving along the axial direction of the mounting hole, or for example Figure 3 As shown in , the piezoelectric ceramic dispensing injection valve also includes a guide member 800, which is disposed in the installation cavity 110. The guide member 800 has a guide hole, and the striker 200 is penetrated through the guide hole and can move axially along the guide hole.

[0046] The lever 400 is disposed in the mounting cavity 110, and the lever 400 has a first connecting portion 410, a second connecting portion 420 and a third connecting portion 430 (eg, Figure 3 As shown), the first connecting portion 410 is rotatably connected to the valve body 100. For example, the first connecting portion 410 and the valve body 100 are rotatably connected through the shaft hole, or, as shown Figure 3 As shown, the first connection part 410 has a rotation groove 411, and the rotating part 140 is arranged in the installation cavity 110. The rotation groove 411 and the rotating part 140 are slidably matched, so as to realize the rotational match between the first connection part 410 and the valve body 100, thereby not only making the rotational connection structure between the first connection part 410 and the valve body 100 simpler, but also making the installation of the lever 400 simpler. The second connection part 420 is connected to the end of the striker 200 away from the dispensing port 130, and the third connection part 430 is located between the first connection part 410 and the second connection part 420, and the end surface of the third connection part 430 away from the striker 200 is a first arc surface 431.

[0047] The piezoelectric ceramic stack 500 is disposed in the mounting cavity 110. The two ends of the piezoelectric ceramic stack 500 respectively include a fourth connecting portion 510 and a fifth connecting portion 520. The fourth connecting portion 510 is connected to the valve body 100. The fifth connecting portion 520 has a second arc surface 521 (refer to Figure 3 ), the second arc surface 521 slides against the first arc surface 431, thereby enabling the fifth connection part 520 and the third connection part 430 to be rotationally connected. Since the third connection part 430 is located between the first connection part 410 and the first connection part 410, the deformation of the piezoelectric ceramic stack 500 can be amplified through the lever 400, thereby improving the driving efficiency and enabling the injection valve to perform dispensing injection more effectively. The elongation and contraction of the piezoelectric ceramic stack 500 is achieved by changing the voltage. When the piezoelectric ceramic stack 500 is elongated, a force is applied to the striker 200 toward the dispensing port 130, so that the striker 200 moves toward the dispensing port 130, and the striker 200 squeezes out the liquid glue at the dispensing port 130 and blocks the dispensing port 130. Furthermore, the piezoelectric ceramic dispensing injection valve also includes a first elastic member 300, and the first elastic member 300 is any elastic structure such as a tension spring and a compression spring. One end of the first elastic member 300 is connected to the valve body 100, and the other end is connected to the striker 200, which is used to apply a force away from the dispensing port 130 to the striker 200, so as to move the striker away from the dispensing port. Therefore, when the piezoelectric ceramic stack 500 is contracted, the striker 200 moves away from the dispensing port 130 under the elastic force of the first elastic member 300, so that the liquid glue flows to the dispensing port 130. Specifically, Figure 3 As shown in the example, the side of the striker 200 has a protrusion 210, and the first elastic member 300 is configured as a compression spring. The first elastic member 300 is sleeved on the outside of the striker 200 and abuts against the protrusion 210, and the other end is connected to the valve body 100 (including but not limited to being directly connected to the valve body 100, for example, it can also be indirectly connected to the valve body 100 through other structural members).

[0048] The limiting structure 600 includes a first limiting portion 610 and a second limiting portion 620 (eg, Figure 4 and Figure 5As shown in FIG. 1 , the first limiting portion 610 and the second limiting portion 620 are respectively located on opposite sides of the fifth connecting portion 520 along the first direction (the first direction is the axial direction of the second arc surface 521), and are used to limit the fifth connecting portion 520 from moving along the first direction, thereby preventing the piezoelectric ceramic stack 500 from being tilted to a large extent in the first direction and being subjected to a large bending moment, thereby ensuring the service life of the piezoelectric ceramic stack 500, so that the piezoelectric ceramic dispensing injection valve has a longer service life. The limiting structure 600 is, for example, a part of the valve body 100, that is, the valve body 100 includes the limiting structure 600, so that the inner wall of the installation cavity 110 is used as the first limiting portion 610 and the second limiting portion 620 to limit the piezoelectric ceramic stack 500, or in some embodiments, the limiting structure 600 and the lever 400 are an integrated structure, thereby making the processing of the limiting structure 600 simpler, and there is no need to install the limiting structure 600 separately, thereby reducing the manufacturing cost.

[0049] In addition, it should be noted that when the piezoelectric ceramic stack 500 contracts, the lever 400, with the cooperation of the first elastic member 300, will rotate and move along with the piezoelectric ceramic stack 500, that is, the first limiting portion 610 and the second limiting portion 620 move along with the piezoelectric ceramic stack 500. Therefore, when the limiting structure 600 and the lever 400 are an integrated structure, regardless of whether the piezoelectric ceramic stack 500 is in the shortest state or in the longest state, the first limiting portion 610 and the second limiting portion 620 can limit the piezoelectric ceramic stack 500 without setting the size of the limiting structure 600 according to the maximum deformation of the piezoelectric ceramic stack 500. Specifically, for example, the first limiting portion 610 and the second limiting portion 620 are part of the valve body 100, and the dimensions of the first limiting portion 610 and the second limiting portion 620 along the deformation direction of the piezoelectric ceramic stack 500 cannot be less than the maximum deformation of the piezoelectric ceramic, so as to ensure that the piezoelectric ceramic stack 500 can be limited by the limiting structure 600 during the deformation process. Therefore, the size of the limiting structure 600 is subject to the deformation of the piezoelectric ceramic, and more factors need to be considered during the design, and the length needs to be longer, which will increase the cost. The limiting structure 600 of this embodiment can move with the deformation of the piezoelectric ceramic stack 500, which can effectively improve this problem.

[0050] Similarly, in some embodiments, the limiting structure 600 is connected to the piezoelectric ceramic stack 500. For example, in the following embodiments, the piezoelectric ceramic stack 500 includes a second connecting member 503, such as Figure 6 As shown, Figure 6 for Figure 4Schematic diagram of the structure of the piezoelectric ceramic stack, the limiting structure 600 and the second connecting member 503 are an integrated structure, and the third connecting portion 430 of the lever 400 is arranged between the first limiting portion 610 and the second limiting portion 620 of the limiting structure 600, so as to limit the relative position between the piezoelectric ceramic stack 500 and the lever 400 in the first direction. As mentioned above, the lever 400 will move with the piezoelectric ceramic stack 500, so the setting of the limiting structure 600 in this embodiment does not need to be subject to the deformation of the piezoelectric ceramic stack 500.

[0051] Reference Figure 2 In some embodiments, the fourth connection portion 510 is rotationally connected to the valve body 100, and the rotation axis between the fourth connection portion 510 and the valve body 100 is parallel to the axis of the second arc surface 521. That is, both ends of the piezoelectric ceramic stack 500 are rotationally connected, so that the piezoelectric ceramic stack 500 forms a two-force rod, and then the direction of the thrust applied by the lever 400 to the piezoelectric ceramic stack 500 during the rotation process is close to parallel to the length direction of the piezoelectric ceramic stack 500, thereby reducing the bending moment of the piezoelectric ceramic stack 500 during the working process, thereby improving the service life of the piezoelectric ceramic.

[0052] Reference Figure 6 In some embodiments, the piezoelectric ceramic stack 500 includes a ceramic stack 501, a first connecting member 502 and a second connecting member 503. The first connecting member 502 and the second connecting member 503 are both wear-resistant structures, such as tungsten steel, stainless steel or aluminum alloy. The first connecting member 502 includes a fourth connecting portion 510, and the second connecting member 503 includes a fifth connecting portion 520. That is, the ceramic stack 501 is slidably abutted against the valve body 100 and the lever 400 respectively through the wear-resistant first connecting member 502 and the second connecting member 503, thereby preventing the ends of the ceramic stack 501 from being subjected to lateral forces, thereby improving the service life of the ceramic stack 501.

[0053] During the deformation process, the piezoelectric ceramic stack 500 may produce a certain offset or bending due to factors such as the internal lattice structure, the steering of the electric domains, and the externally applied voltage. Therefore, when the fifth connecting portion 520 is located between the first limiting portion 610 and the second limiting portion 620, that is, in the embodiment where the fifth connecting portion 520 is located between the first limiting portion 610 and the second limiting portion 620, if the first limiting portion 610 and the second limiting portion 620 are tightly attached to both sides of the fifth connecting portion 520, during the deformation process of the piezoelectric ceramic stack 500, a force will be generated between the fifth connecting portion 520 and the first limiting portion 610 or the second limiting portion 620, thereby causing friction between the fifth connecting portion 520 and the first limiting portion 610 or the second limiting portion 620, and at the same time causing the piezoelectric ceramic stack 500 to be subjected to a bending moment, thereby affecting the service life of the piezoelectric ceramic stack 500. Based on this, in order to improve this problem, in some embodiments, along the first direction, the size of the fifth connecting portion 520 is L 1 , the distance between the first limiting portion 610 and the second limiting portion 620 is L 2 , 0.1mm≤L 2 -L 1 ≤0.2mm, during installation, the fifth connecting part 520 is arranged between the first limiting part 610 and the second limiting part 620, and a certain gap is provided between the fifth connecting part 520 and the first limiting part 610 and the second limiting part 620, so that the piezoelectric ceramic stack 500 has a certain deformation space in the first direction, thereby not only effectively reducing the possibility that the fifth connecting part 520 is subjected to friction by the limiting structure 600, but also reducing the possibility that the piezoelectric ceramic stack 500 is subjected to bending moment, thereby extending the service life of the piezoelectric ceramic stack 500, and further extending the service life of the piezoelectric ceramic dispensing injection valve.

[0054] It should be noted that the reason why L 2 -L 1 ≤0.2mm is to avoid that the gap is too large, which will cause the piezoelectric ceramic stack 500 to have a large moving space in the first direction, and cause the piezoelectric ceramic stack 500 to tilt too much and be subjected to a large bending moment. 2 -L 1 The distance is set between 0.1 mm and 0.2 mm, which can provide a certain deformation space for the piezoelectric ceramic stack 500 in the first direction and prevent the piezoelectric ceramic stack 500 from being subjected to excessive bending moment.

[0055] Similarly, in some embodiments, when the first limiting portion 610 and the second limiting portion 620 are both connected to the fifth connecting portion 520, the third connecting portion 430 is located between the first limiting portion 610 and the second limiting portion 620, and the size of the third connecting portion 430 is L 3, the distance between the first limiting portion 610 and the second limiting portion 620 is L 4 , 0.1mm≤L 4 -L 3 ≤0.2mm, no further details are given here.

[0056] Reference Figure 7 , Figure 7 for Figure 6 , based on the above embodiment, the end of the fourth connection part 510 facing away from the fifth connection part 520 has a spherical surface 511, and the spherical surface 511 is used for ball connection with the valve body 100. Specifically, for example, the inner wall of the installation cavity 110 has a spherical groove, and the fifth connection part 520 cooperates with the spherical groove to be ball-connected with the valve body 100, or the inner wall of the installation cavity 110 is also connected to other components, and the component is provided with a spherical groove facing the installation cavity 110, and the fifth connection part 520 is indirectly ball-connected with the valve body 100 through ball connection with the component. It can be known that, through the ball connection between the fifth connection part 520 and the valve body 100, the piezoelectric ceramic stack 500 can be rotated arbitrarily within a certain spatial range, so that when the piezoelectric ceramic stack 500 is deformed to a certain extent along the first direction, under the action of the interaction force with the lever 400, the fourth connection part 510 can be rotated to a certain extent, so that the piezoelectric ceramic stack 500 forms a two-force rod, thereby reducing the bending moment of the piezoelectric ceramic stack 500. In addition, the ball connection method can also limit the fourth connection part 510 to prevent the fourth connection part 510 from moving, thereby improving the stability of the piezoelectric ceramic stack 500, so as to prevent the fourth connection part 510 of the piezoelectric ceramic stack 500 from being displaced and causing the piezoelectric ceramic stack 500 to be subjected to a bending moment.

[0057] Reference Figure 3 In some embodiments, the end surface of the second connecting portion 420 facing the striker 200 is a third arc surface 421, and the third arc surface 421 slides against the striker 200, thereby making the second connecting portion 420 smoother when sliding relative to the striker 200, thereby making the lever 400 move more stably, and further making the piezoelectric ceramic stack 500 subject to a more stable force, thereby improving the service life of the piezoelectric ceramic stack 500.

[0058] Reference Figure 3In some embodiments, the piezoelectric ceramic dispensing injection valve further includes a first elastic member 500 and a second elastic member 700. As described above, the first elastic member 300 is, for example, a tension spring, a compression spring, or any other elastic structure. One end of the first elastic member 300 is connected to the valve body 100, and the other end is connected to the striker 200, and is used to apply a force to the striker 200 away from the dispensing port 130. The second elastic member 700 is, for example, a tension spring, a compression spring, or any other elastic structure. One end of the second elastic member 700 is connected to the side of the lever 400 facing the striker 200, and the other end is connected to the valve body 100. The second elastic member 700 is used to apply a force to the lever 400 away from the striker 200. Therefore, when the piezoelectric ceramic stack 500 contracts, the lever 400 can be rotated quickly, thereby causing the striker 200 to move quickly.

[0059] It should be noted that the use of the first elastic member 300 with a larger elastic coefficient can also enable the striker 200 to move quickly. However, the use of the first elastic member 300 with a larger elastic coefficient to push the striker 200 will cause a greater pressure to be generated between the striker 200 and the lever 400, thereby causing greater wear between the striker 200 and the lever 400. In this embodiment, the second elastic member 700 as another elastic structure is used to directly act on the lever 400, thereby reducing the interaction force between the lever 400 and the striker 200, so that the striker 200 can move quickly, and the wear of the striker 200 and the lever 400 is reduced, thereby improving the service life of the piezoelectric ceramic dispensing injection valve of this embodiment.

[0060] Reference Figure 3 In some embodiments, the first elastic member 300 and the second elastic member 700 are both compression springs. The first elastic member 300 is sleeved on the outside of the firing pin 200, and the second elastic member 700 is sleeved on the outside of the first elastic member 300, thereby saving the setting space of the first elastic member 300 and the second elastic member 700 of this embodiment, thereby making the structure of the piezoelectric ceramic dispensing injection valve of this embodiment simpler and more compact, thereby reducing the manufacturing cost of the piezoelectric ceramic dispensing injection valve of this embodiment.

[0061] The dispensing device of the second embodiment of the utility model comprises the piezoelectric ceramic dispensing injection valve of the first embodiment. The piezoelectric ceramic dispensing injection valve comprises a limiting structure 600, wherein the first limiting portion 610 and the second limiting portion 620 of the limiting structure 600 are respectively arranged on both sides of the piezoelectric ceramic stack 500 along the first direction, and are used to limit the movement of the piezoelectric ceramic stack 500 in the first direction, so as to prevent the piezoelectric ceramic stack 500 from being tilted to a large extent in the first direction and being subjected to an increased bending moment, thereby ensuring the service life of the piezoelectric ceramic stack 500, so that the piezoelectric ceramic dispensing injection valve has a longer service life, so as to improve the service life of the dispensing device of this embodiment.

[0062] It should be noted that, since this embodiment adopts all the technical features of the first aspect embodiment, this embodiment has all the beneficial effects brought by the first aspect embodiment, which will not be repeated here.

[0063] The above is a detailed description of the embodiment of the utility model in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned embodiment, and various changes can be made without departing from the purpose of the utility model within the scope of knowledge possessed by ordinary technicians in the relevant technical field. In addition, in the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. Piezoelectric ceramic dispensing injection valve, characterized in that: include: The valve body has a mounting cavity, a flow channel and a dispensing port, wherein the flow channel is connected to the dispensing port; A striker, movably disposed in the mounting cavity and capable of blocking the dispensing port; A lever, arranged in the mounting cavity, the lever having a first connection portion, a second connection portion and a third connection portion, the first connection portion being rotatably connected to the valve body, the second connection portion being connected to an end of the striker away from the dispensing port, the third connection portion being located between the first connection portion and the second connection portion, and an end surface of the third connection portion away from the striker being a first arc surface; A piezoelectric ceramic stack is arranged in the installation cavity, and two ends of the piezoelectric ceramic stack respectively include a fourth connecting portion and a fifth connecting portion, the fourth connecting portion abuts against the valve body, and the fifth connecting portion has a second arc surface adapted to the first arc surface, and the second arc surface is in sliding abutment with the first arc surface; The limiting structure includes a first limiting portion and a second limiting portion, wherein the first limiting portion and the second limiting portion are respectively located on opposite sides of the fifth connecting portion along a first direction, and are used to limit the movement of the fifth connecting portion along the first direction, wherein the first direction is the axial direction of the second arc surface.

2. The piezoelectric ceramic dispensing injection valve according to claim 1, characterized in that: The limiting structure and the lever are an integrated structure.

3. The piezoelectric ceramic dispensing injection valve according to claim 1, characterized in that: The fourth connection portion is rotatably connected to the valve body, and a rotation axis between the fourth connection portion and the valve body is parallel to an axis of the second arc surface.

4. The piezoelectric ceramic dispensing injection valve according to claim 3 is characterized in that: The piezoelectric ceramic stack includes a ceramic stack body, a first connector and a second connector. Both the first connector and the second connector are wear-resistant structures. The first connector includes the fourth connector, and the second connector includes the fifth connector.

5. The piezoelectric ceramic dispensing injection valve according to claim 1, characterized in that: Along the first direction, the size of the fifth connection portion is L1, the distance between the first limiting portion and the second limiting portion is L2, 0.1mm≤L2-L1≤0.2mm; or, The first limiting portion and the second limiting portion are both connected to the fifth connecting portion, the third connecting portion is located between the first limiting portion and the second limiting portion, along the first direction, the size of the third connecting portion is L3, the distance between the first limiting portion and the second limiting portion is L4, 0.1mm≤L4-L3≤0.2mm.

6. The piezoelectric ceramic dispensing injection valve according to claim 5, characterized in that: An end of the fourth connecting portion facing away from the fifth connecting portion has a spherical surface, and the spherical surface is used for spherical connection with the valve body.

7. The piezoelectric ceramic dispensing injection valve according to claim 1, characterized in that: The end surface of the second connecting portion facing the striker is a third arc surface, and the third arc surface is in sliding contact with the striker.

8. The piezoelectric ceramic dispensing injection valve according to claim 1, characterized in that: The piezoelectric ceramic dispensing injection valve also includes a first elastic member and a second elastic member, one end of the first elastic member is connected to the valve body, and the other end is connected to the striker, and is used to apply a force to the striker away from the dispensing port, one end of the second elastic member is connected to the side of the lever facing the striker, and the other end is connected to the valve body, and the second elastic member is used to apply a force to the lever away from the striker.

9. The piezoelectric ceramic dispensing injection valve according to claim 8, characterized in that: The first elastic member and the second elastic member are both compression springs. The first elastic member is sleeved on the outside of the striker, and the second elastic member is sleeved on the outside of the first elastic member.

10. Glue dispensing equipment, characterized in that, A piezoelectric ceramic dispensing injection valve comprising any one of claims 1 to 9.

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