Springback control type fluid on-off structure and dental sand blasting equipment

Abstract

The utility model discloses a springback control type fluid on-off structure and dental sand blasting equipment, the fluid on-off structure comprises a cylinder body, a plug rod assembly, an on-off assembly and a springback piece, an air supply device is used for ventilating air into an air pressure cavity of the cylinder body through an air vent of the cylinder body; the piston rod assembly is driven to drive the sealing end of the piston rod assembly to compress the springback piece in the direction away from the ventilation opening, and the piston end of the piston rod assembly is pushed in the direction away from the ventilation opening, so that the piston end of the piston rod assembly blocks communication of the fluid through hole; the rebound piece pushes the piston end of the plug rod assembly towards the ventilation opening when the air supply device is not ventilated, so that the fluid through hole is communicated through the piston through hole. The design value of the bottom surface area of the sealing end of the plug rod assembly is increased along with the increase of the elastic coefficient of the springback piece, so that it is ensured that the air supply device has enough thrust to push the sealing end of the plug rod assembly to compress the springback piece, it is ensured that the springback force of the springback piece can smoothly push the plug rod assembly to be accurately reset, and therefore the accuracy of controlling on-off of sand powder fluid is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to dental medical instrument technical field especially, relate to a kind of rebound control type fluid on-off structure and dental sandblasting equipment. BACKGROUND

[0002] At present, sandblasting scaling in dentistry is driven by compressed air to spray sand powder to the surface of teeth, and then combined with liquid medium sprayed with sand powder, so as to impact dental plaque and calculus on the surface of teeth with certain kinetic energy, thereby achieving the effect of cleaning the surface of teeth.

[0003] In the current practical application, a pinch valve is arranged between the sand powder cavity and the nozzle, and its working principle is that the driving mechanism drives the pressure rod to be pressed on the hose by pushing force, so that the hose is compressed and deformed, thereby cutting off the fluid inside the hose. However, the repeated clamping of the pinch valve on the hose can cause damage to the hose. Therefore, a structure for controlling the on-off of fluid is needed between the sand powder cavity and the nozzle in the dental sandblasting equipment. The fluid on-off structure adopts a combination control mode of air pressure pushing and rebounding of a rebounding member, controls the movement of a plug rod assembly in the piston cavity of an on-off assembly, and then controls whether the piston through hole of the plug rod assembly and the fluid through hole of the on-off assembly can be aligned and communicated, so as to control the on-off of sand powder fluid.

[0004] However, in actual operation, the rebounding member can easily cause the plug rod assembly to be unable to reset accurately when pushing the plug rod assembly, so that the piston through hole and the fluid through hole cannot be accurately aligned and communicated, thereby making it difficult to accurately control the on-off of sand powder fluid. Therefore, how to ensure that the plug rod assembly can reset accurately to improve the accuracy of controlling the on-off of sand powder fluid has become a problem to be solved. SUMMARY

[0005] The utility model embodiment discloses a rebound control type fluid on-off structure and dental sandblasting equipment, which can ensure that the plug rod assembly resets accurately to improve the accuracy of controlling the on-off of sand powder fluid.

[0006] In order to achieve the above-mentioned purpose, in the first aspect, the utility model discloses a rebound control type fluid on-off structure, which comprises:

[0007] A cylinder body has a gas pressure cavity and a gas inlet, the gas pressure cavity is communicated with the gas inlet, and the gas inlet is connected with a gas supply device outside;

[0008] A plug rod assembly is arranged in the gas pressure cavity close to one end of the gas inlet, the sealing end of the plug rod assembly is arranged towards the gas inlet, the piston end of the plug rod assembly is arranged away from the gas inlet, and the piston end of the plug rod assembly is provided with a piston through hole in the vertical direction of the radial direction of the gas pressure cavity.

[0009] A switching assembly is arranged in the air pressure cavity away from the air inlet, and is provided with a piston cavity in the radial direction of the air pressure cavity, and is provided with a fluid passage hole in the vertical direction of the radial direction of the air pressure cavity, the fluid passage hole is communicated with the piston cavity, and the piston end of the plug rod assembly is in contact with the inner wall of the piston cavity;

[0010] A resilient member is arranged between the plug rod assembly and the switching assembly in the air pressure cavity, wherein the design value of the bottom surface area of the sealing end of the plug rod assembly increases with the increase of the elastic coefficient of the resilient member;

[0011] The air supply device is used to air through the air inlet to the air pressure cavity, so as to drive the sealing end of the plug rod assembly to compress the resilient member away from the air inlet, and to push the piston end of the plug rod assembly away from the air inlet, so that the piston end of the plug rod assembly blocks the communication of the fluid passage hole; the resilient member is used to push the piston end of the plug rod assembly towards the air inlet when the air supply device is not aerated, so that the fluid passage hole is communicated through the piston passage hole.

[0012] As an optional embodiment, in the embodiment of the first aspect of the utility model, the plug rod assembly comprises:

[0013] A plug rod base is arranged in the air pressure cavity close to the air inlet, and the circumferential surface of the plug rod base is in contact with the inner wall of the air pressure cavity to seal the air pressure cavity;

[0014] A plug rod body is connected to the side of the plug rod base away from the air inlet, and the plug rod body has a fixed passage cavity, and the plug rod body is arranged in the piston cavity; wherein the resilient member is sleeved on the plug rod body, one end of the resilient member close to the air inlet is in contact with the side of the plug rod base away from the air inlet, and the other end of the resilient member away from the air inlet is in contact with the side of the switching assembly close to the air inlet;

[0015] A sealing sheet has a piston passage hole, and the sealing sheet is arranged in the fixed passage cavity, and the opposite two sides of the sealing sheet are in contact with the inner wall of the piston cavity, respectively;

[0016] The air supply device is used for supplying air to the air pressure cavity through the air inlet, so as to drive the plunger base to compress the resilient member and push the plunger body and the sealing sheet away from the air inlet, so that the sealing sheet blocks the communication of the fluid through hole; and the resilient member is used for pushing the plunger base towards the air inlet, so as to drive the plunger body and the sealing sheet to move towards the air inlet, so that the fluid through hole is communicated through the piston through hole.

[0017] As an optional implementation, in the embodiment of the first aspect of the utility model, the resilient member is a spring arranged in a spiral shape and along the axial direction of the air pressure cavity; wherein the design value of the bottom surface area of the plunger base increases with the increase of the spring wire diameter of the resilient member.

[0018] As an optional implementation, in the embodiment of the first aspect of the utility model, a sealing rubber ring is arranged on the circumference of the plunger base, and the sealing rubber ring is in contact with the inner wall of the air pressure cavity to seal the air pressure cavity.

[0019] As an optional implementation, in the embodiment of the first aspect of the utility model, the on-off assembly comprises:

[0020] The outer shell is arranged at one end of the air pressure cavity away from the air inlet, and the outer shell is provided with a piston cavity in the radial direction of the air pressure cavity, and the outer shell is provided with a fluid through hole in the vertical direction of the radial direction of the air pressure cavity, and the fluid through hole is communicated with the piston cavity;

[0021] The first sealing member is arranged on the first inner surface of the piston cavity, and the first sealing member is provided with a first through hole in the vertical direction of the radial direction of the air pressure cavity, and the first through hole is communicated with the piston cavity;

[0022] The second sealing member is arranged on the second inner surface of the piston cavity, and the second sealing member is provided with a second through hole in the vertical direction of the radial direction of the air pressure cavity, and the second through hole is communicated with the piston cavity;

[0023] The first inner surface and the second inner surface are two opposite inner surfaces of the piston cavity, the sealing surface of the first sealing member and the sealing surface of the second sealing member are oppositely arranged, the opposite two side surfaces of the sealing sheet are respectively in contact with the sealing surface of the first sealing member and the sealing surface of the second sealing member, and the first through hole and the second through hole are oppositely arranged.

[0024] As an optional implementation, in the embodiment of the first aspect of the utility model, the outer shell comprises:

[0025] The first base has a third through hole, and a connecting side of the first base is provided with a first piston groove, the third through hole is communicated with the first piston groove, the first sealing piece is arranged on an inner surface of the first piston groove, and a first through hole of the first sealing piece is arranged opposite to the third through hole of the first base;

[0026] The second base has a fourth through hole, and a connecting side of the second base is provided with a second piston groove, the fourth through hole is communicated with the second piston groove, the second sealing piece is arranged on an inner surface of the second piston groove, and a second through hole of the second sealing piece is arranged opposite to the fourth through hole of the second base;

[0027] The connecting side of the first base is arranged opposite to the connecting side of the second base, and the connecting side of the first base is connected with the connecting side of the second base, so that the first piston groove and the second piston groove form the piston cavity.

[0028] As an optional implementation, in the embodiment of the first aspect of the utility model, the inner surface of the first piston groove of the first base is provided with a first fixed groove, the third through hole is communicated with the first fixed groove, the first sealing piece is arranged in the first fixed groove, and a sealing surface of the first sealing piece is flush with the inner surface of the first piston groove;

[0029] The inner surface of the second piston groove of the second base is provided with a second fixed groove, the fourth through hole is communicated with the second fixed groove, the second sealing piece is arranged in the second fixed groove, and a sealing surface of the second sealing piece is flush with the inner surface of the second piston groove.

[0030] As an optional implementation, in the embodiment of the first aspect of the utility model, the structure further comprises:

[0031] The first flow guide connector is arranged at the third through hole of the first base, and an interface of the first flow guide connector is respectively communicated with the third through hole of the first base and the first through hole of the first sealing piece;

[0032] The second flow guide connector is arranged at the fourth through hole of the second base, and an interface of the second flow guide connector is respectively communicated with the fourth through hole of the second base and the second through hole of the first sealing piece.

[0033] As an optional implementation, in the embodiment of the first aspect of the utility model, the composition material of the sealing piece, the composition material of the first sealing piece and the composition material of the second sealing piece are all ceramic materials.

[0034] The second aspect of the utility model discloses a dental sand blasting equipment, the equipment includes:

[0035] The rebound control type fluid on-off structure as claimed in the first aspect of the utility model;

[0036] The air supply device is connected with the air passage of the cylinder body, and is used for ventilating the air pressure cavity through the air passage;

[0037] The sand blasting flow guide pipe body is communicated with the fluid through hole of the on-off assembly.

[0038] Compared with the prior art, the utility model has the beneficial effects that:

[0039] The rebound control type fluid on-off structure provided by the utility model can increase the design value of the bottom surface area of the sealing end of the plug rod assembly with the increase of the elastic coefficient of the rebounding piece, so as to ensure that the air supply device has enough pushing force to compress the rebounding piece of the sealing end of the plug rod assembly, and ensure that the rebounding force of the rebounding piece can smoothly push the plug rod assembly to accurately reset, thereby improving the accuracy of controlling the on-off of the sand powder fluid.

[0040] The dental sand blasting equipment provided by the utility model adopts the above fluid on-off structure, can increase the design value of the bottom surface area of the sealing end of the plug rod assembly with the increase of the elastic coefficient of the rebounding piece, so as to ensure that the air supply device has enough pushing force to compress the rebounding piece of the sealing end of the plug rod assembly, and ensure that the rebounding force of the rebounding piece can smoothly push the plug rod assembly to accurately reset, thereby improving the accuracy of controlling the on-off of the sand powder fluid. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a structure schematic view of the rebound control type fluid on-off structure in the utility model;

[0042] Figure 2 It is a sectional structure schematic view of one specific embodiment of the rebound control type fluid on-off structure in the utility model;

[0043] Figure 3 It is a structure schematic view of the plug rod base, plug rod body, sealing sheet and rebounding piece in the rebound control type fluid on-off structure of the utility model.

[0044] Among them, the meaning of the sign is as follows:

[0045] Cylinder body 100, plug rod assembly 200, plug rod base 210, plug rod body 220, sealing sheet 230, on-off assembly 300, outer shell 310, first base 311, second base 312, first sealing piece 320, second sealing piece 330, rebounding piece 400, first flow guide connector 500, second flow guide connector 600. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0047] In the present application, the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal", and the like are based on the orientations or positional relationships shown in the drawings. These terms are mainly used for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to necessarily have a specific orientation, or to be constructed and operated in a specific orientation.

[0048] In addition, in addition to being used to indicate orientations or positional relationships, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those of ordinary skill in the art can understand the specific meanings of these terms in the present application according to specific circumstances.

[0049] In addition, the terms "mount", "set", "provided with", "connect", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present application according to specific circumstances.

[0050] In addition, the terms "first", "second", and the like are mainly used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0051] The technical solutions of the present application will be further described below with reference to the embodiments and drawings.

[0052] At present, sandblasting and scaling in dentistry is achieved by spraying sandblasting powder driven by compressed air to the surface of teeth, and then combining with the liquid medium sprayed with the sandblasting powder to impact the dental plaque and dental calculus on the surface of teeth with a certain kinetic energy, so as to clean the surface of teeth.

[0053] In practical applications, the dental sandblasting equipment needs to be able to control the start and stop of the sandblasting powder to respond quickly, so it is necessary to configure a fluid on-off structure between the sand powder cavity and the nozzle in the dental sandblasting equipment. The fluid on-off structure adopts a combination control mode of air pressure pushing and spring rebounding, controls the movement of the plug rod assembly in the piston cavity of the on-off assembly, and then controls whether the piston through hole of the plug rod assembly and the fluid through hole of the on-off assembly can be aligned and communicated, so as to control the on-off of the sand powder fluid.

[0054] However, in actual operation, the spring is prone to lack of rebound force and smooth rebound when pushing the plug rod assembly, so that the plug rod assembly cannot be accurately reset, so that the piston through hole and the fluid through hole cannot be accurately aligned and communicated, and thus it is difficult to accurately control the on-off of the sand powder fluid. Therefore, how to ensure that the plug rod assembly can be accurately reset to improve the accuracy of controlling the on-off of the sand powder fluid has become a problem to be solved.

[0055] To this end, the utility model embodiment discloses a spring control type fluid on-off structure and dental sandblasting equipment, which can ensure that the plug rod assembly is accurately reset to improve the accuracy of controlling the on-off of the sand powder fluid.

[0056] As Figure 1The utility model discloses a rebound control type fluid on-off structure, and the fluid on-off structure includes: cylinder body 100, plug rod subassembly 200, on-off subassembly 300 and rebound piece 400. Cylinder body 100 has air pressure cavity and vent, and air pressure cavity communicates with vent, and vent is connected with the gas supply device of outside, plug rod subassembly 200 is set up in the one end of air pressure cavity close to vent, and the sealing end of plug rod subassembly 200 is set up towards vent, and the piston end of plug rod subassembly 200 is set up away from vent, and the piston end of plug rod subassembly 200 is equipped with piston through -hole in the vertical direction of the radial of air pressure cavity, on-off subassembly 300 is set up in the one end of air pressure cavity away from vent, and on-off subassembly 300 is equipped with piston cavity in the radial of air pressure cavity, and on-off subassembly 300 is equipped with fluid through -hole in the vertical direction of the radial of air pressure cavity, and fluid through -hole communicates with piston cavity, and the piston end of plug rod subassembly 200 contacts with the inner wall of piston cavity, rebound piece 400 is set up in the air pressure cavity between plug rod subassembly 200 and on-off subassembly 300, wherein, the design value of the bottom surface area of the sealing end of plug rod subassembly 200 increases along with the increase of the elastic coefficient of rebound piece 400, the gas supply device is used to vent to the air pressure cavity through vent, to drive the sealing end of plug rod subassembly 200 to compress rebound piece 400 in the direction away from vent, and the piston end of plug rod subassembly 200 is pushed in the direction away from vent, to make the piston end of plug rod subassembly 200 block the communication of fluid through -hole, rebound piece 400 is used to push the piston end of plug rod subassembly 200 towards vent when the gas supply device is not vented, to make fluid through -hole communicate through piston through -hole.

[0057] In the embodiment, refer to Figure 1 , the bottom end of cylinder body 100 is provided with vent, and the inside of cylinder body 100 has air pressure cavity which is vertically longitudinal in radial direction, and vent communicates with air pressure cavity. Plug rod subassembly 200 is arranged in the one end of air pressure cavity close to bottom, and the bottom of plug rod subassembly 200 is sealing end, and the bottom surface of sealing end is arranged towards vent, and the top of plug rod subassembly 200 is piston end, and piston end of plug rod subassembly 200 is provided with piston through -hole in left-right horizontal direction.

[0058] On-off subassembly 300 is arranged in the one end of air pressure cavity close to top, and on-off subassembly 300 is provided with piston cavity in up-down longitudinal direction, and is provided with fluid through -hole in left-right horizontal direction, and fluid through -hole is divided into left through -hole and right through -hole, and both left and right through -holes of fluid through -hole communicate with piston cavity in the middle, and piston end of plug rod subassembly 200 can be arranged in piston cavity and contact with the inner wall of piston cavity. It can be understood that the cavity shape of piston cavity is determined by the shape of piston end of plug rod subassembly 200, that is, the cavity shape of piston cavity needs to conform to the shape of piston end of plug rod subassembly 200, so that piston end of plug rod subassembly 200 can move up and down in piston cavity, and piston end of plug rod subassembly 200 can contact with the inner wall of piston cavity during movement.

[0059] The spring-loaded component 400 is disposed between the piston rod assembly 200 and the on / off assembly 300. When the air supply device vents air into the air pressure chamber inside the cylinder body 100 through the air vent of the cylinder body 100, the piston rod assembly 200 moves upward under the action of air pressure. This causes the spring-loaded component 400 to be pushed upward by the piston rod assembly 200 and compressed upward, which in turn causes the piston end of the piston rod assembly 200 to move upward in the piston cavity. This causes the piston through hole on the piston end of the piston rod assembly 200 to be misaligned with the fluid through hole of the on / off assembly 300. That is, the piston end of the piston rod assembly 200 blocks the connection between the left and right through holes of the fluid through hole, and the sand powder fluid cannot flow through the fluid through hole. After the air supply device stops supplying air to the air pressure chamber in the cylinder body 100, the spring-loaded component 400 rebounds under the influence of the elastic potential energy after compression, thereby pushing the piston rod assembly 200 downward, so that the piston through hole on the piston end of the piston rod assembly 200 is aligned with the fluid through hole of the on / off assembly 300, that is, the left and right through holes of the fluid through hole are connected through the piston through hole of the piston rod assembly 200, and at this time the sand powder fluid can flow through the fluid through hole.

[0060] The required design value for the bottom surface area of ​​the sealing end of the plug rod assembly 200 is related to the elastic coefficient of the spring element 400. As the elastic coefficient of the spring element 400 increases, the designed bottom surface area of ​​the sealing end of the plug rod assembly 200 also increases. To ensure that the spring element 400 has sufficient rebound force during the rebound process to smoothly and accurately push the plug rod assembly 200 back to its original position, the elastic coefficient of the spring element 400 needs to be increased to increase its rebound force. However, due to the increased elastic coefficient of the spring element 400, a greater thrust is required when the air supply device is activated so that the plug rod assembly 200 can compress the spring element 400 upwards. Let the thrust on the sealing end of the piston rod assembly 200 be F = P × S, where P is the air pressure in the air chamber inside the cylinder body 100 and S is the bottom surface area of ​​the sealing end of the piston rod assembly 200. To avoid wasting the venting gas, P needs to be a fixed value. In order to increase F, the design value of S needs to be increased accordingly to ensure that the air supply device has sufficient thrust to push the sealing end of the piston rod assembly 200 to compress the spring member 400.

[0061] It can be seen that the rebound control type fluid on / off structure of this utility model can increase the design value of the bottom surface area of ​​the sealing end of the plug rod assembly 200 as the elastic coefficient of the rebound member 400 increases, so as to ensure that the air supply device has sufficient thrust to push the sealing end of the plug rod assembly 200 to compress the rebound member 400, and to ensure that the rebound force of the rebound member 400 can smoothly push the plug rod assembly 200 to accurately reset, thereby improving the accuracy of controlling the flow of sand powder fluid.

[0062] like Figure 2 and Figure 3As shown, in one optional embodiment, the plug rod assembly 200 comprises a plug rod base 210, a plug rod body 220 and a sealing sheet 230. The plug rod base 210 is arranged in the air pressure cavity near the air inlet end, and the circumference of the plug rod base 210 is in contact with the inner wall of the air pressure cavity to seal the air pressure cavity; the plug rod body 220 is connected to the side of the plug rod base 210 away from the air inlet, and the plug rod body 220 has a fixed through cavity, and the plug rod body 220 is arranged in the piston cavity; wherein the rebounding piece 400 is sleeved on the plug rod body 220, the end of the rebounding piece 400 near the air inlet is in contact with the side of the plug rod base 210 away from the air inlet, and the end of the rebounding piece 400 away from the air inlet is in contact with the side of the on-off assembly 300 near the air inlet; the sealing sheet 230 has a piston through hole, and the sealing sheet 230 is arranged in the fixed through cavity, and the opposite two sides of the sealing sheet 230 are in contact with the inner wall of the piston cavity respectively; wherein the air supply device is used to air through the air inlet to the air pressure cavity, so as to drive the plug rod base 210 to compress the rebounding piece 400 in the direction away from the air inlet, and drive the plug rod body 220 and the sealing sheet 230 to move in the direction away from the air inlet, so that the sealing sheet 230 blocks the communication of the fluid through hole; the rebounding piece 400 is used to drive the plug rod base 210 to move towards the air inlet, so as to drive the plug rod body 220 and the sealing sheet 230 to move towards the air inlet, so that the fluid through hole is communicated through the piston through hole.

[0063] In this optional embodiment, referring to Figure 2 , the plug rod base 210 is arranged in the air pressure cavity near the bottom end, and the plug rod base 210 is the sealing end of the plug rod assembly 200, and the bottom surface of the plug rod base 210 is the bottom surface of the sealing end of the plug rod assembly 200. Figure 3 , the plug rod body 220 is arranged on and connected to the upper side of the plug rod base 210, and the plug rod body 220 is a frame type limiting device, and the middle part of the plug rod body 220 has a fixed through cavity, and the fixed through cavity is in communication with the outside of the plug rod body 220 through the left and right sides. The plug rod body 220 fixes the sealing sheet 230 in the fixed through cavity of the plug rod body 220, that is, the plug rod body 220 and the sealing sheet 230 constitute the piston end of the plug rod assembly 200. Wherein, the left and right two sides of the sealing sheet 230 are in contact with the inner surface of the piston cavity of the on-off assembly 300, and the piston through hole is arranged on the sealing sheet 230 and is in communication with the left and right sides.

[0064] Referring to Figure 2 and Figure 3 , the rebounding piece 400 is sleeved on the plug rod body 220, the lower end of the rebounding piece 400 is in contact with the upper side of the plug rod base 210, and the upper end of the rebounding piece 400 is in contact with the lower side of the on-off assembly 300.

[0065] It can be seen that the optional embodiment can also fix the sealing sheet 230 in the fixed cavity of the plug rod body 220 by the plug rod body 220, so that the sealing sheet 230 will not be separated from the piston cavity when moving up and down in the piston cavity due to the limiting, thereby ensuring the reliability of the fluid on-off structure in controlling the fluid on-off.

[0066] As shown in Figure 2 and Figure 3 In an optional embodiment, the resilient member 400 is a spring arranged in a spiral shape and axially along the air pressure cavity; wherein the design value of the bottom surface area of the plug rod base 210 increases with the increase of the spring wire diameter of the resilient member 400.

[0067] In the optional embodiment, the resilient member 400 can be selected as a spring arranged in a spiral shape and axially along the air pressure cavity, the spring is sleeved on the plug rod body 220, and the lower end of the spring is in contact with the upper side of the plug rod base 210, and the upper end of the spring is in contact with the lower side of the on-off assembly 300.

[0068] Since the greater the diameter of the spring wire, the higher the elastic coefficient of the spring as a whole, the resilience of the resilient member 400 is correspondingly greater. In order to ensure that the resilient member 400 has sufficient resilience to smoothly push the plug rod base 210 to the bottom of the air pressure cavity during the resilience process, the piston through hole of the sealing sheet 230 is accurately aligned with the fluid through hole of the on-off assembly 300, it is necessary to increase the spring wire diameter of the resilient member 400. Correspondingly, according to the description of the above embodiment, in order to ensure that the air supply device has sufficient pushing force to push the plug rod base 210 to compress the resilient member 400, the design value of the bottom surface area of the plug rod base 210 needs to increase with the increase of the spring wire diameter of the resilient member 400.

[0069] It can be seen that the optional embodiment can also increase the spring wire diameter of the resilient member 400 to increase the resilience of the resilient member 400, thereby further ensuring that the resilient member 400 has sufficient resilience to smoothly push the plug rod base 210 to reset during the resilience process.

[0070] In an optional embodiment, a sealing rubber ring is arranged on the circumference of the plug rod base 210, and the sealing rubber ring is in contact with the inner wall of the air pressure cavity of the cylinder body 100 to seal the air pressure cavity.

[0071] In the optional embodiment, the sealing rubber ring is arranged on the circumference of the plug rod base 210 and in contact with the inner wall of the air pressure cavity of the cylinder body 100. When the air supply device ventilates the air pressure cavity in the cylinder body 100, the sealing rubber ring can ensure that the air pressure cavity below the plug rod base 210 is sealed.

[0072] As can be seen, this optional embodiment can further seal the air pressure chamber with a sealing ring, so that the air pressure chamber can have sufficient air pressure to push the piston rod base 210 upward, thereby further improving the reliability of the fluid on / off structure in controlling the flow of sand powder fluid.

[0073] like Figure 2 As shown, in an optional embodiment, the on / off assembly 300 includes: a housing 310, a first seal 320, and a second seal 330. The outer casing 310 is located at the end of the pressure chamber furthest from the vent. The outer casing 310 has a piston cavity in the radial direction of the pressure chamber and a fluid passage in the direction perpendicular to the radial direction of the pressure chamber, communicating with the piston cavity. A first seal 320 is located on the first inner surface of the piston cavity and has a first through hole in the direction perpendicular to the radial direction of the pressure chamber, communicating with the piston cavity. A second seal 330 is located on the second inner surface of the piston cavity and has a second through hole in the direction perpendicular to the radial direction of the pressure chamber, communicating with the piston cavity. The first and second inner surfaces are opposite inner surfaces of the piston cavity. The sealing surfaces of the first and second seals 320 and 330 are opposite to each other. Two opposite sides of the sealing plate 230 contact the sealing surfaces of the first and second seals 320, respectively. The first and second through holes are opposite to each other.

[0074] In this optional embodiment, refer to Figure 2 The outer casing 310 has a vertically extending piston cavity, the upper and lower ends of which are connected to the outside of the outer casing 310. The left and right inner walls of the outer casing 310 are the first inner surface and the second inner surface of the piston cavity, respectively, that is, the first inner surface and the second inner surface of the piston cavity are two opposite inner surfaces of the piston cavity.

[0075] The first seal 320 is disposed on the first inner surface of the piston cavity, and the sealing surface of the first seal 320 is the right side surface of the first seal 320. The second seal 330 is disposed on the second inner surface of the piston cavity, and the sealing surface of the second seal 330 is the left side surface of the second seal 330. The first through hole of the first seal 320 and the second through hole of the second seal 330 are correspondingly arranged to each other in the left-right lateral direction. The left side surface of the sealing piece 230 contacts the sealing surface of the first seal 320, and the right side surface of the sealing piece 230 contacts the sealing surface of the second seal 330.

[0076] When the piston through-hole on the sealing plate 230 is misaligned with the first through-hole of the first seal 320 and the second through-hole of the second seal 330, the sealing plate 230 will block the communication between the first and second through-holes, preventing the sand powder fluid from flowing from the first through-hole through the second through-hole or vice versa. When the piston through-hole on the sealing plate 230 is aligned with the first through-hole of the first seal 320 and the second through-hole of the second seal 330, that is, the first and second through-holes can be connected through the piston through-hole of the sealing plate 230, the sand powder fluid can flow through the first through-hole, the piston through-hole, and the second through-hole.

[0077] As can be seen, this optional embodiment can also combine the first seal 320 and the second seal 330 with the sealing sheet 230. When the sealing sheet 230 blocks the communication between the first through hole and the second through hole, the sealing sheet 230 can seal with the first seal 320 and the second seal 330 respectively, thereby ensuring that the fluid switching structure can accurately shut off the flow of sand and powder fluid.

[0078] like Figure 2 As shown, in an optional embodiment, the outer casing 310 includes: a first base 311 and a second base 312. The first base 311 has a third through hole, and a first piston groove is provided on the connecting side of the first base 311. The third through hole communicates with the first piston groove. A first seal 320 is disposed on the inner surface of the first piston groove, and the first through hole of the first seal 320 is opposite to the third through hole of the first base 311. The second base 312 has a fourth through hole, and a second piston groove is provided on the connecting side of the second base 312. The fourth through hole communicates with the second piston groove. A second seal 330 is disposed on the inner surface of the second piston groove, and the second through hole of the second seal 330 is opposite to the fourth through hole of the second base 312. The connecting side of the first base 311 is opposite to the connecting side of the second base 312, and the connecting side of the first base 311 is connected to the connecting side of the second base 312, so that the first piston groove and the second piston groove form a piston cavity.

[0079] In this optional embodiment, refer to Figure 2 The outer casing 310 can be divided into a first base 311 on the left side and a second base 312 on the right side.

[0080] The connecting side of the first base 311 is located on its right side. A first piston groove is provided on the connecting side of the first base 311, and the inner surface of the first piston groove is the first inner surface of the aforementioned piston cavity. A first sealing element 320 is provided on the inner surface of the first piston groove. The connecting side of the second base 312 is located on its left side. A second piston groove is provided on the connecting side of the second base 312, and the inner surface of the second piston groove is the second inner surface of the aforementioned piston cavity. A second sealing element 330 is provided on the inner surface of the second piston groove.

[0081] The connecting side of the first base 311 is connected to the connecting side of the second base 312, such that the first piston groove of the first base 311 and the second piston groove of the second base 312 enclose the aforementioned piston cavity, that is, the piston rod body 220 and the sealing plate 230 can move up and down in the first piston groove and the second piston groove. It can be understood that the shape of the first piston groove and the shape of the second piston groove are determined by the shape of the sealing plate 230, which can be referred to in the description of the internal shape of the piston cavity.

[0082] Furthermore, the first base 311 also has a third through hole, and the third through hole of the first base 311 is opposite to and communicates with the first through hole of the first seal 320. The second base 312 also has a fourth through hole, and the fourth through hole of the second base 312 is opposite to and communicates with the second through hole of the second seal 330.

[0083] As can be seen, this optional embodiment can also form a piston cavity by the first piston groove of the first base 311 and the second piston groove of the second base 312, so that the piston rod body 220 and the sealing plate 230 can move in the first piston groove and the second piston groove.

[0084] like Figure 2 As shown, in an optional embodiment, the inner surface of the first piston groove of the first base 311 is provided with a first fixing groove, a third through hole communicates with the first fixing groove, and a first sealing member 320 is disposed in the first fixing groove, with the sealing surface of the first sealing member 320 being flush with the inner surface of the first piston groove; the inner surface of the second piston groove of the second base 312 is provided with a second fixing groove, a fourth through hole communicates with the second fixing groove, and a second sealing member 330 is disposed in the second fixing groove, with the sealing surface of the second sealing member 330 being flush with the inner surface of the second piston groove.

[0085] In this optional embodiment, a first fixing groove is provided on the inner surface of the first piston groove, and a first sealing member 320 is disposed in the first fixing groove. The first sealing members 320 are sequentially disposed on the inner surface of the first fixing groove, so that the first fixing groove can fix the first sealing member 320. A second fixing groove is provided on the inner surface of the second piston groove, and a second sealing member 330 is disposed in the second fixing groove. The second sealing members 330 are sequentially disposed on the inner surface of the second fixing groove, so that the second fixing groove can fix the second sealing member 330.

[0086] Furthermore, the sealing surface of the first seal 320 is flush with the inner surface of the first piston groove, and the sealing surface of the second seal 330 is flush with the inner surface of the second piston groove, so that the sealing plate 230 can move up and down in the first piston groove and the second piston groove, and the first seal 320 can contact the sealing plate 230 through its sealing surface, and the second seal 330 can contact the sealing plate 230 through its sealing surface.

[0087] As can be seen, this optional embodiment can also fix the first sealing member 320 through the first fixing groove of the first base 311 and fix the second sealing member 330 through the second fixing groove of the second base 312, so that the first sealing member 320 and the second sealing member 330 will not separate due to being limited when the sealing piece 230 moves up and down, thereby further ensuring the reliability of the fluid flow control structure.

[0088] like Figure 2 As shown, in an optional embodiment, the fluid flow control structure further includes: a first flow guide connector 500 and a second flow guide connector 600. The first flow guide connector 500 is disposed at the third through hole of the first base 311, and the interface of the first flow guide connector 500 is connected to the third through hole of the first base 311 and the first through hole of the first seal 320, respectively; the second flow guide connector 600 is disposed at the fourth through hole of the second base 312, and the interface of the second flow guide connector 600 is connected to the fourth through hole of the second base 312 and the second through hole of the first seal 320, respectively.

[0089] In this optional embodiment, the first flow guide 500 is connected to the third through hole of the first base 311, so that the interface of the first flow guide 500 communicates with the third through hole of the first base 311 and the first through hole of the first seal 320, respectively. The second flow guide 600 is connected to the fourth through hole of the second base 312, so that the interface of the second flow guide 600 communicates with the fourth through hole of the second base 312 and the second through hole of the second seal 330, respectively. The first flow guide 500 and the second flow guide 600 can be connected to an external fluid guide pipe, so that the sand and powder fluid transported by the fluid guide pipe can enter and exit the fluid on / off structure.

[0090] As can be seen, this optional embodiment can also introduce and discharge the sandblasting fluid that needs to be controlled through the first flow guide joint 500 and the second flow guide joint 600, ensuring that the sandblasting fluid will not overflow when it is transported to and discharged from the fluid flow control structure, thereby improving the stability of the sandblasting fluid transport.

[0091] Reference Figure 2In one specific embodiment, when the air supply device supplies air to the air pressure cavity in the cylinder body 100 through the air vent of the cylinder body 100, the air pressure in the air pressure cavity in the cylinder body 100 is P, the area of the lower side of the plunger base 210 is S, the air pressure thrust of the air supply device to the plunger base 210 is P x S, the dynamic friction between the circumference of the plunger base 210 and the inner wall of the air pressure cavity is the first dynamic friction F1, the stroke compression force of the resilient member 400 is F2, and the total dynamic friction between the sealing sheet 230 and the first sealing member 320 and the second sealing member 330 is the second dynamic friction F3. At this time, if F > F1+F2+F3, the air supply device can push the plunger base 210 to start moving upward, so that the resilient member 400 is pushed by the plunger base 210 to compress upward, and the plunger body 220 and the sealing sheet 230 are driven to move upward in the piston cavity, so that the piston through hole on the sealing sheet 230 is out of position with the fluid through hole of the on-off assembly 300, that is, the sealing sheet 230 blocks the communication between the first through hole and the second through hole, and the sand powder fluid cannot flow through the fluid through hole.

[0092] After the air supply device stops supplying air to the air pressure cavity in the cylinder body 100, the resilient member 400 has three rebound stages: the highest point rebound, the intermediate rebound, and the bottom rebound. In the highest point rebound stage, the plunger base 210 is moved to the highest point that the plunger base 210 can reach in the air pressure cavity due to the pushing of the air pressure, the stroke compression force of the resilient member 400 is F2, the static friction of the plunger base 210 at the highest point is F4, and the total static friction between the sealing sheet 230 and the first sealing member 320 and the second sealing member 330 at the first point downward rebound is F5. At this time, F2 > F4+F5 is required, so that the resilient member 400 can push the plunger base 210 to drive the sealing sheet 230 to rebound downward.

[0093] In the intermediate rebound stage, the stroke compression force of the resilient member 400 is F2', the dynamic friction between the circumference of the plunger base 210 and the inner wall of the air pressure cavity is F1', and the total dynamic friction between the sealing sheet 230 and the first sealing member 320 and the second sealing member 330 is F3'. In this stage, F2'>F1'+F3' is required, so that the resilient member 400 can maintain the downward pushing of the plunger base 210.

[0094] In the bottom rebounding stage, the plug rod base 210 is moved to the lowest point that it can reach in the air pressure cavity due to the rebounding push of the rebounding piece 400, the stroke compression force of the rebounding piece 400 is F2', the static friction force of the plug rod base 210 at the second point is F4', the total static friction force between the sealing sheet 230 and the first sealing piece 320 and the second sealing piece 330 upward rebounding at the second point is F5', and F2'>F4'+F5' is required in this stage, so that the rebounding piece 400 can reset the sealing sheet 230 to the position, so that the piston through hole on the sealing sheet 230 is aligned with the fluid through hole of the on-off assembly 300, that is, the first through hole and the second through hole can realize communication through the piston through hole of the sealing sheet 230, and at this time, the sand powder fluid can flow through the fluid through hole.

[0095] It can be understood that when the rebounding piece 400 is configured for the fluid on-off structure according to the above force analysis, the following additional possible force conditions also need to be considered: when the sealing sheet 230 blocks the communication between the first through hole and the second through hole, the gas in the fluid guide pipe may be blown back to the plug rod base 210 due to insufficient sealing degree of the sealing sheet 230, and then the downward pressure is applied to the plug rod base 210; When the sand powder enters between the sealing sheet 230 and the first sealing piece 320 and the second sealing piece 330, the friction between the sealing sheet 230 and the first sealing piece 320 and the second sealing piece 330 will increase.

[0096] In an optional embodiment, the sealing sheet 230, the first sealing piece 320 and the second sealing piece 330 are all ceramic materials.

[0097] In this optional embodiment, the sealing sheet 230, the first sealing piece 320 and the second sealing piece 330 can all be ceramic materials. Since the sealing sheet 230 moves in the piston cavity and rubs against the first sealing piece 320 and the second sealing piece 330, by using ceramic materials with excellent wear resistance, the friction loss between the sealing sheet 230 and the first sealing piece 320 and the second sealing piece 330 can be effectively reduced, and the air tightness of the fluid on-off structure is further ensured.

[0098] It can be seen that the optional embodiment can also use ceramic materials as the composition materials of the sealing sheet 230, the first sealing piece 320 and the second sealing piece 330, so as to effectively reduce the friction loss between the sealing sheet 230 and the first sealing piece 320 and the second sealing piece 330, and further ensure the air tightness of the fluid on-off structure.

[0099] The utility model discloses also disclose a kind of dental sand blasting equipment, it includes gas supply device, sand blasting flow guide pipe body and the rebound control type fluid on-off structure described in the utility model above described embodiment of the utility model. Gas supply device is connected with the air port of cylinder body 100, and gas supply device is used to ventilate air pressure cavity through air port;Sand blasting flow guide pipe body is communicated with the fluid through hole of on-off component 300.

[0100] In the embodiment, sand blasting flow guide pipe body has front section pipe body and rear section pipe body, and the front section pipe body of sand blasting flow guide pipe body is communicated with the third through hole of first base 311 and the first through hole of first sealing piece 320 by being connected with first flow guide joint 500, and the rear section pipe body is communicated with the fourth through hole of second base 312 and the second through hole of second sealing piece 330 by being connected with second flow guide joint 600.

[0101] Gas supply device is connected with the air port of cylinder body 100, and gas supply device can control the vertical movement of sealing sheet 230 in the piston cavity formed by first piston groove and second piston groove by the way of ventilating and pressurizing the air pressure cavity of cylinder body 100. Sand blasting flow guide pipe body can transport sand blasting fluid, when the piston through hole of sealing sheet 230 is aligned with first through hole and second through hole, first through hole and second through hole can be communicated through piston through hole, and the sand blasting fluid transported by front section pipe body can flow through first through hole, piston through hole and second through hole and be transported to rear section pipe body, when the piston through hole of sealing sheet 230 is not aligned with first through hole and second through hole, the non-through hole part of sealing sheet 230 can block the communication between first through hole and second through hole, and the sand blasting fluid transported by front section pipe body cannot be transported to rear section pipe body.

[0102] It can be seen that, in the dental sand blasting equipment of the embodiment, the design value of the sealing end bottom surface area of plug rod assembly 200 can be increased with the increase of the elastic coefficient of rebound piece 400 by using the rebound control type fluid on-off structure described above, to ensure that gas supply device has enough thrust to push the sealing end of plug rod assembly 200 to compress rebound piece 400, and to ensure that the rebound force of rebound piece 400 can smoothly push plug rod assembly 200 to reset accurately, so as to improve the accuracy of controlling sand powder fluid on-off.

[0103] The technical means disclosed by the utility model scheme is not limited to the technical means disclosed by the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features. It should be noted that, for ordinary skilled persons in the art, without departing from the principles of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. A rebound control type fluid on-off structure characterized by, The structure comprises: a cylinder body having a gas cavity and a gas inlet, the gas cavity being in communication with the gas inlet, and the gas inlet being connected with an external gas supply device; a plug rod assembly arranged at one end of the gas cavity close to the gas inlet, a sealing end of the plug rod assembly being arranged towards the gas inlet, a piston end of the plug rod assembly being arranged away from the gas inlet, and the piston end of the plug rod assembly being provided with a piston through hole in a vertical direction of a radial direction of the gas cavity; an on-off assembly arranged at one end of the gas cavity away from the gas inlet, the on-off assembly being provided with a piston cavity in the radial direction of the gas cavity, and the on-off assembly being provided with a fluid through hole in a vertical direction of the radial direction of the gas cavity, the fluid through hole being in communication with the piston cavity, and the piston end of the plug rod assembly being in contact with an inner wall of the piston cavity; a resilient member arranged between the plug rod assembly and the on-off assembly in the gas cavity; wherein a design value of a bottom surface area of the sealing end of the plug rod assembly is increased with an increase of an elastic coefficient of the resilient member; wherein the gas supply device is used to supply gas into the gas cavity through the gas inlet to drive the sealing end of the plug rod assembly to compress the resilient member in a direction away from the gas inlet, and to push the piston end of the plug rod assembly in a direction away from the gas inlet, so that the piston end of the plug rod assembly blocks the communication of the fluid through hole; and the resilient member is used to push the piston end of the plug rod assembly towards the gas inlet when the gas supply device is not supplying gas, so that the fluid through hole is communicated through the piston through hole.

2. The rebound control type fluid on-off structure according to claim 1, wherein The plug rod assembly comprises: a plug rod base arranged at one end of the gas cavity close to the gas inlet, a circumferential surface of the plug rod base being in contact with an inner wall of the gas cavity to seal the gas cavity; a plug rod body connected with one side of the plug rod base away from the gas inlet, the plug rod body being provided with a fixed through cavity, and the plug rod body being arranged in the piston cavity; wherein the resilient member is sleeved on the plug rod body, one end of the resilient member close to the gas inlet being in contact with one side of the plug rod base away from the gas inlet, and one end of the resilient member away from the gas inlet being in contact with one side of the on-off assembly close to the gas inlet; a sealing sheet provided with a piston through hole, the sealing sheet being arranged in the fixed through cavity, and opposite two sides of the sealing sheet being in contact with the inner wall of the piston cavity respectively; wherein the gas supply device is used to supply gas into the gas cavity through the gas inlet to drive the plug rod base to compress the resilient member in a direction away from the gas inlet, and to push the plug rod body and the sealing sheet in a direction away from the gas inlet, so that the sealing sheet blocks the communication of the fluid through hole; and the resilient member is used to push the plug rod base towards the gas inlet to drive the plug rod body and the sealing sheet to move towards the gas inlet, so that the fluid through hole is communicated through the piston through hole.

3. The rebound control fluid on-off structure according to claim 2, wherein The resilient member is a spring arranged in a spiral shape and axially along the air pressure cavity; wherein the design value of the bottom surface area of the plug rod base increases with the increase of the spring wire diameter of the resilient member.

4. The rebound control fluid on-off structure according to claim 2, wherein A sealing rubber ring is arranged on the circumference of the plug rod base, and the sealing rubber ring is in contact with the inner wall of the air pressure cavity to seal the air pressure cavity.

5. The rebound control fluid on-off structure according to claim 2, wherein The on-off assembly comprises: An outer shell is arranged at one end of the air pressure cavity away from the air inlet, and the outer shell is provided with a piston cavity in the radial direction of the air pressure cavity, and the outer shell is provided with a fluid through hole in the vertical direction of the radial direction of the air pressure cavity, and the fluid through hole is in communication with the piston cavity; A first sealing member is arranged on a first inner surface of the piston cavity, and the first sealing member is provided with a first through hole in the vertical direction of the radial direction of the air pressure cavity, and the first through hole is in communication with the piston cavity; A second sealing member is arranged on a second inner surface of the piston cavity, and the second sealing member is provided with a second through hole in the vertical direction of the radial direction of the air pressure cavity, and the second through hole is in communication with the piston cavity; The first inner surface and the second inner surface are two opposite inner surfaces of the piston cavity, the sealing surface of the first sealing member and the sealing surface of the second sealing member are oppositely arranged, the opposite two side surfaces of the sealing sheet are respectively in contact with the sealing surface of the first sealing member and the sealing surface of the second sealing member, and the first through hole and the second through hole are oppositely arranged.

6. The rebound control fluid on-off structure according to claim 5, wherein The outer shell comprises: A first base has a third through hole, and the connecting side of the first base is provided with a first piston groove, and the third through hole is in communication with the first piston groove, and the first sealing member is arranged on the inner surface of the first piston groove, and the first through hole of the first sealing member is oppositely arranged with the third through hole of the first base; A second base has a fourth through hole, and the connecting side of the second base is provided with a second piston groove, and the fourth through hole is in communication with the second piston groove, and the second sealing member is arranged on the inner surface of the second piston groove, and the second through hole of the second sealing member is oppositely arranged with the fourth through hole of the second base; The connecting side of the first base is oppositely arranged with the connecting side of the second base, and the connecting side of the first base is connected with the connecting side of the second base, so that the first piston groove and the second piston groove form the piston cavity.

7. The rebound control fluid on-off structure according to claim 6, wherein The inner surface of the first piston groove of the first base is provided with a first fixing groove, the third through hole is in communication with the first fixing groove, the first sealing member is arranged in the first fixing groove, and the sealing surface of the first sealing member is flush with the inner surface of the first piston groove; The inner surface of the second piston groove of the second base is provided with a second fixing groove, the fourth through hole is in communication with the second fixing groove, the second sealing member is arranged in the second fixing groove, and the sealing surface of the second sealing member is flush with the inner surface of the second piston groove.

8. The rebound control fluid on-off structure according to claim 7, wherein The structure further comprises: A first flow guide connector is arranged at the third through hole of the first base, and interfaces of the first flow guide connector are respectively communicated with the third through hole of the first base and the first through hole of the first sealing piece; A second flow guide connector is arranged at the fourth through hole of the second base, and interfaces of the second flow guide connector are respectively communicated with the fourth through hole of the second base and the second through hole of the first sealing piece.

9. The rebound control fluid on-off structure according to claim 8, wherein The sealing piece, the first sealing piece and the second sealing piece are all made of ceramic material.

10. A dental sandblasting device, characterized in that The device comprises: The rebound control type fluid on-off structure according to any one of claims 1 to 9; A gas supply device is connected with the air passage of the cylinder block, and is used for ventilating the air pressure cavity through the air passage; A sand blasting flow guide pipe body is communicated with the fluid through hole of the on-off assembly.

Images