On-off control structure and dental sand blasting equipment

Abstract

The utility model discloses an on-off control structure and dental sandblasting equipment, the on-off control structure comprises a cylinder body, an on-off assembly, a plug rod assembly and buffer assemblies, the buffer assemblies are arranged at the sealing end of the plug rod assembly and / or one end of the on-off assembly facing an air vent and the inner wall of one end of an air pressure cavity of the cylinder body close to the air vent; when the sealing end of the plug rod assembly moves in the air pressure cavity, the buffering assembly can buffer collision of the sealing end of the plug rod assembly on the air cylinder body and the on-off assembly. According to the on-off control structure and the dental sand blasting equipment, the collision between the plug rod assembly and the cylinder body and the collision between the plug rod assembly and the on-off assembly can be buffered through the buffer assembly, so that the loss of related parts of the on-off control structure is reduced, and the service life of the on-off control structure is prolonged; and noise generated when the on-off control structure works is reduced.

Description

Technical Field

[0001] This utility model relates to the field of dental medical device technology, and in particular to an on / off control structure and a dental sandblasting device. Background Technology

[0002] Currently, in dentistry, air polishing involves using compressed air to propel air polishing powder onto the tooth surface. This powder, combined with a liquid medium, uses kinetic energy to impact plaque and tartar on the tooth surface, thus cleaning the teeth.

[0003] In practical applications, dental blasting equipment needs to be able to quickly respond to the start and stop of blasting powder. Therefore, an on / off control structure needs to be configured between the powder chamber and the nozzle in the dental blasting equipment. This on / off control structure uses air pressure to push the piston end of the plunger assembly to move in the piston cavity of the on / off assembly, controlling whether the through hole on the piston end can communicate with the through hole of the on / off assembly, thereby controlling the flow of powder fluid.

[0004] However, in actual operation, the piston rod assembly collides with the cylinder wall and the on / off control assembly during movement, causing wear and tear on related components of the on / off control structure and generating noise during operation. Therefore, reducing wear and tear on the on / off control structure to extend its service life and reducing noise during operation have become urgent problems to be solved. Utility Model Content

[0005] This utility model discloses an on / off control structure and a dental sandblasting device, which can reduce the wear of the on / off control structure to extend its service life and reduce the noise generated by the on / off control structure during operation.

[0006] To achieve the above objectives, in a first aspect, this utility model discloses an on / off control structure, the structure comprising:

[0007] The cylinder body has a pressure chamber and an air vent. The pressure chamber is connected to the air vent, and the air vent is connected to an external air supply device. The air supply device is used to supply air to the pressure chamber through the air vent to change the pressure state of the pressure chamber.

[0008] A switching assembly is provided at one end of the pressure chamber away from the vent. The switching assembly has a piston cavity in the radial direction of the pressure chamber and a fluid through hole in the direction perpendicular to the radial direction of the piston cavity. The fluid through hole communicates with the piston cavity.

[0009] A plug rod assembly is arranged in the air pressure cavity near the air vent, a sealing end of the plug rod assembly is arranged towards the air vent, a piston end of the plug rod assembly is arranged away from the air vent, 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 air pressure cavity; wherein the sealing end of the plug rod assembly is used to move in the air pressure cavity according to the air pressure state of the air pressure cavity, to drive the piston end of the plug rod assembly to move in the piston cavity, so that the piston end of the plug rod assembly blocks the communication of the fluid through hole, or the fluid through hole communicates through the piston through hole;

[0010] A buffer assembly is arranged at the sealing end of the plug rod assembly, and / or is arranged at one end of the on-off assembly towards the air vent and the inner wall of the air pressure cavity of the cylinder body near the air vent, and the buffer assembly is used to buffer the collision of the cylinder body and the on-off assembly respectively when the sealing end of the plug rod assembly moves in the air pressure cavity.

[0011] As an optional embodiment, in the embodiment of the first aspect of the utility model, the plug rod assembly comprises:

[0012] A plug rod base is arranged in the air pressure cavity near the air vent, the plug rod base is the sealing end of the plug rod assembly, the buffer assembly is arranged on the surface of the plug rod base, and the circumferential direction of the plug rod base is in contact with the inner wall of the air pressure cavity to seal the air pressure cavity.

[0013] A plug rod body is connected to the side of the plug rod base away from the air vent, the plug rod body has a fixed through cavity, and the plug rod body is arranged in the piston cavity.

[0014] A sealing sheet has a piston through hole, the sealing sheet is arranged in the fixed through cavity, and the opposite two sides of the sealing sheet are respectively in contact with the inner wall of the piston cavity.

[0015] The plug rod base is used to move in the air pressure cavity according to the air pressure state of the air pressure cavity, to drive the plug rod body and the sealing sheet to move in the piston cavity, so that the sealing sheet blocks the communication of the fluid through hole, or the fluid through hole communicates through the piston through hole.

[0016] As an optional embodiment, in the embodiment of the first aspect of the utility model, the buffer assembly comprises:

[0017] A first buffer is arranged on the surface of the plug rod base on the side facing the air inlet, and is used to buffer the collision of the air cylinder body when the plug rod base moves in the air pressure cavity.

[0018] A second buffer is arranged on the surface of the plug rod base on the side away from the air inlet, and is used to buffer the collision of the on-off assembly when the plug rod base moves in the air pressure cavity.

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

[0020] A third buffer is arranged on the inner wall of the air pressure cavity of the air cylinder body on the side close to the air inlet, and is used to buffer the collision of the air cylinder body when the plug rod base moves in the air pressure cavity.

[0021] A fourth buffer is arranged on the surface of the on-off assembly on the side facing the air inlet, and is used to buffer the collision of the on-off assembly when the plug rod base moves in the air pressure cavity.

[0022] As an optional implementation, in the embodiment of the first aspect of the utility model, the plug rod assembly further comprises:

[0023] A resilient member is arranged between the plug rod base and the on-off assembly in the air pressure cavity.

[0024] The air supply device is used to change the air pressure state of the air pressure cavity by air supply to the air pressure cavity, so as to drive the plug rod base to compress the resilient member in the direction away from the air inlet, and push the plug rod body and the sealing sheet in the direction away from the air inlet, so that the sealing sheet blocks the communication of the fluid through hole; the resilient member is used to push the plug rod base towards the air inlet, so as to drive the plug rod body and the sealing sheet to move towards the air inlet, so that the fluid through hole is communicated through the piston through hole.

[0025] As an optional implementation, in the embodiment of the first aspect of the utility model, the on-off assembly comprises:

[0026] An outer shell is arranged on the end of 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 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.

[0027] A first seal is arranged on a first inner surface of the piston cavity, and the first seal is provided with a first through hole in a vertical direction of a radial direction of the air pressure cavity, and the first through hole is communicated with the piston cavity;

[0028] A second seal is arranged on a second inner surface of the piston cavity, and the second seal is provided with a second through hole in a vertical direction of a radial direction of the air pressure cavity, and the second through hole is communicated with the piston cavity;

[0029] The first inner surface and the second inner surface are two opposite inner surfaces of the piston cavity, the sealing surface of the first seal and the sealing surface of the second seal are oppositely arranged, the opposite two side surfaces of the sealing sheet are respectively in contact with the sealing surface of the first seal and the sealing surface of the second seal, and the first through hole and the second through hole are oppositely arranged.

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

[0031] A first base is provided with a third through hole and a first piston groove on a connecting side of the first base, the third through hole is communicated with the first piston groove, the first seal is arranged on an inner surface of the first piston groove, and the first through hole of the first seal is oppositely arranged with the third through hole of the first base;

[0032] A second base is provided with a fourth through hole and a second piston groove on a connecting side of the second base, the fourth through hole is communicated with the second piston groove, the second seal is arranged on an inner surface of the second piston groove, and the second through hole of the second seal is oppositely arranged with the fourth through hole of the second base;

[0033] The connecting side of the first base and the connecting side of the second base are oppositely arranged, and the connecting side of the first base and the connecting side of the second base are connected, so that the first piston groove and the second piston groove form the piston cavity.

[0034] As an optional implementation, in the embodiment of the first aspect of the utility model, an inner surface of the first piston groove of the first base is provided with a first fixing groove, the third through hole is communicated with the first fixing groove, the first seal is arranged in the first fixing groove, and the sealing surface of the first seal is flush with the inner surface of the first piston groove;

[0035] The inner surface of the second piston groove of the second base is provided with a second fixing groove, the fourth through hole is communicated with the second fixing groove, and the second sealing piece is arranged in the second fixing groove, and the sealing surface of the second sealing piece is flush with the inner surface of the second piston groove.

[0036] As an optional implementation, in the embodiment of the first aspect of the utility model, the structure further comprises:

[0037] The first flow guide joint is arranged at the third through hole of the first base, and the interface of the first flow guide joint is respectively communicated with the third through hole of the first base and the first through hole of the first sealing piece;

[0038] The second flow guide joint is arranged at the fourth through hole of the second base, and the interface of the second flow guide joint is respectively communicated with the fourth through hole of the second base and the second through hole of the first sealing piece.

[0039] Secondly, the utility model discloses a dental sand blasting equipment, and the equipment comprises:

[0040] The on-off control structure as claimed in the first aspect of the utility model;

[0041] The gas supply device is connected with the air inlet of the cylinder body, and the gas supply device is used for ventilating the air pressure cavity through the air inlet;

[0042] The sand blasting flow guide pipe body is communicated with the fluid through hole of the on-off assembly.

[0043] Compared with the prior art, the utility model has the beneficial effects that:

[0044] The on-off control structure provided by the utility model can buffer the collision of the sealing end of the plug rod assembly with the cylinder body and the on-off assembly respectively when the sealing end of the plug rod assembly moves in the air pressure cavity, so that the wear of the related parts of the on-off control structure can be reduced, the service life of the on-off control structure can be prolonged, and the noise generated when the on-off control structure works can be reduced.

[0045] The dental sand blasting equipment provided by the utility model has the above-mentioned on-off control structure, the buffer assembly is arranged on the inner wall of the sealing end of the plug rod assembly or the end of the on-off assembly facing the air inlet and the air pressure cavity of the cylinder body, when the sealing end of the plug rod assembly moves in the air pressure cavity, the buffer assembly can buffer the collision of the sealing end of the plug rod assembly with the cylinder body and the on-off assembly respectively, thereby the loss of the components related to the on-off control structure can be reduced, the service life of the on-off control structure is prolonged, and the noise generated when the on-off control structure works is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 It is a structure schematic view of a specific embodiment of the on-off control structure in the utility model;

[0047] Figure 2 It is a sectional structure schematic view of the first specific embodiment of the on-off control structure in the utility model;

[0048] Figure 3 It is a sectional structure schematic view of the second specific embodiment of the on-off control structure in the utility model;

[0049] Figure 4 It is a sectional structure schematic view of the third specific embodiment of the on-off control structure in the utility model.

[0050] Among them, the meaning of the reference signs is as follows:

[0051] Cylinder body 100, on-off assembly 200, outer shell 210, first base 211, second base 212, first sealing element 220, second sealing element 230, plug rod assembly 300, plug rod base 310, plug rod body 320, sealing sheet 330, rebound element 340, buffer assembly 400, first buffer element 410, second buffer element 420, third buffer element 430, fourth buffer element 440, first flow guide connector 500, second flow guide connector 600. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0053] In the utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used for better describing the utility model 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.

[0054] In addition to indicating the orientation or positional relationship, 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. For those skilled in the art, the specific meaning of these terms in the utility model can be understood according to the specific situation.

[0055] In addition, the terms "mount", "set", "provided with", "connect", "connect" 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 the internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific situation.

[0056] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific type and structure 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.

[0057] The technical scheme of the utility model will be further described below in combination with embodiments and drawings.

[0058] At present, sandblasting and scaling in dentistry is achieved by driving sandblasting powder to the tooth surface by compressed air, and then combining with the liquid medium sprayed with the sandblasting powder to impact the dental plaque and dental calculus on the tooth surface with a certain kinetic energy, so as to clean the tooth surface.

[0059] In actual application, the dental sandblasting equipment needs to be able to control the start and stop of the sandblasting powder to respond quickly, so a on-off control structure needs to be configured between the sand powder cavity and the nozzle in the dental sandblasting equipment. The on-off control structure adopts the mode that the piston end of the push rod assembly is driven by air pressure to move in the piston cavity of the on-off assembly, controls whether the through hole on the piston end can communicate with the through hole of the on-off assembly, and thus controls the on-off of the sand powder fluid.

[0060] However, in actual operation, the plug rod assembly collides with the inner wall of the cylinder of the on-off control structure and the on-off assembly when moving, thereby causing the related components of the on-off control structure to be susceptible to damage and causing noise when the on-off control structure is working. Therefore, how to reduce the damage of the on-off control structure to prolong the service life and reduce the noise generated when the on-off control structure is working has become a problem to be solved.

[0061] To this end, the utility model discloses a kind of on-off control structure and dental sand blasting equipment, which can reduce the damage of on-off control structure, prolong service life, and reduce the noise generated when on-off control structure is working.

[0062] As Figure 1 Indicated, the utility model discloses a kind of on-off control structure, the on-off control structure includes: cylinder body 100, on-off assembly 200, plug rod assembly 300 and buffer assembly 400.Cylinder body 100 has gas pressure cavity and air vent, gas pressure cavity is communicated with air vent, air vent is connected with the gas supply device of outside, gas supply device is used to be ventilated to gas pressure cavity by air vent, to change the gas pressure state of gas pressure cavity;On-off assembly 200 is set to one end of gas pressure cavity away from air vent, on-off assembly 200 is equipped with piston cavity in the radial direction of gas pressure cavity, on-off assembly 200 is equipped with fluid through hole in the vertical direction of the radial direction of piston cavity, fluid through hole is communicated with piston cavity;Plug rod assembly 300 is set to one end of gas pressure cavity close to air vent, the sealing end of plug rod assembly 300 is set to air vent, the piston end of plug rod assembly 300 is set to air vent, the piston end of plug rod assembly 300 is equipped with piston through hole in the vertical direction of the radial direction of gas pressure cavity;Wherein, the sealing end of plug rod assembly 300 is used to move in gas pressure cavity according to the gas pressure state, to drive the piston end of plug rod assembly 300 to move in piston cavity, so that the piston end of plug rod assembly 300 blocks the communication of fluid through hole, or makes fluid through hole communicate through piston through hole;Buffer assembly 400 is set to the sealing end of plug rod assembly 300, and / or the inner wall of one end of on-off assembly 200 towards air vent and the gas pressure cavity of cylinder body 100 close to one end of air vent, buffer assembly 400 is used to buffer the collision of cylinder body 100 and on-off assembly 200 when the sealing end of plug rod assembly 300 moves in gas pressure cavity respectively.

[0063] In the embodiment, referring to Figure 1 , the bottom end of cylinder body 100 is provided with air vent, and the inside of cylinder body 100 has a gas pressure cavity with upper and lower vertical radial directions, and the air vent is communicated with the gas pressure cavity.

[0064] The on-off assembly 200 is arranged at one end of the air pressure cavity close to the top, and the on-off assembly 200 is provided with a piston cavity in the vertical direction and a fluid through hole in the horizontal direction. The fluid through hole is divided into a left through hole and a right through hole, and the left and right through holes of the fluid through hole are communicated with the piston cavity. The plug rod assembly 300 is arranged at one end of the air pressure cavity close to the bottom, the bottom of the plug rod assembly 300 is a sealing end, the bottom surface of the sealing end faces the air inlet, the top of the plug rod assembly 300 is a piston end, and the piston end of the plug rod assembly 300 is provided with a piston through hole in the horizontal direction. The piston end of the plug rod assembly 300 can be arranged in the piston cavity and in contact with the inner wall of the piston cavity.

[0065] The external air supply device is connected with the air inlet of the cylinder body 100, and the air supply device can change the air pressure in the air pressure cavity by the way of air through the air inlet, so as to drive the sealing end of the plug rod assembly 300 to move up and down in the air pressure cavity, and drive the piston end of the plug rod assembly 300 to move in the piston cavity. When the piston through hole on the piston end of the plug rod assembly 300 is misaligned with the fluid through hole of the on-off assembly 200, the piston end of the plug rod assembly 300 blocks the communication between the left through hole and the right through hole of the fluid through hole, and the sand powder fluid cannot flow through the fluid through hole. When the piston through hole on the piston end of the plug rod assembly 300 is aligned with the fluid through hole of the on-off assembly 200, the left through hole and the right through hole of the fluid through hole are communicated through the piston through hole of the plug rod assembly 300, and the sand powder fluid can flow through the fluid through hole.

[0066] With reference to Figure 1 The buffer assembly 400 can be arranged on the sealing end of the plug rod assembly 300, on the bottom end of the on-off assembly 200, on the inner wall of the bottom end of the air pressure cavity of the cylinder body 100, or on all the above positions. When the sealing end of the plug rod assembly 300 moves in the air pressure cavity, the buffer assembly 400 can buffer the collision of the sealing end of the plug rod assembly 300 with the cylinder body 100 and the on-off assembly 200 respectively, so as to reduce the damage caused by the collision between the plug rod assembly 300 and the on-off assembly 200 and the cylinder body 100 respectively, prolong the service life of the on-off control structure, and reduce the noise generated by the collision between the plug rod assembly 300 and the on-off assembly 200 and the cylinder body 100.

[0067] It can be seen that the on-off control structure can buffer the collision of the plug rod assembly 300 by the buffer assembly 400, reduce the damage of the related parts of the on-off control structure, prolong the service life of the on-off control structure, and reduce the noise generated by the on-off control structure during operation.

[0068] As Figure 2As shown, in one optional embodiment, the plug rod assembly 300 comprises a plug rod base 310, a plug rod body 320 and a sealing sheet 330. The plug rod base 310 is arranged in the air pressure cavity near one end close to the air inlet, the plug rod base 310 is the sealing end of the plug rod assembly 300, the buffer assembly 400 is arranged on the surface of the plug rod base 310, the circumference of the plug rod base 310 is in contact with the inner wall of the air pressure cavity to seal the air pressure cavity; the plug rod body 320 is connected to the side of the plug rod base 310 away from the air inlet, the plug rod body 320 has a fixed through cavity, and the plug rod body 320 is arranged in the piston cavity; the sealing sheet 330 has a piston through hole, the sealing sheet 330 is arranged in the fixed through cavity, and the opposite two sides of the sealing sheet 330 are respectively in contact with the inner wall of the piston cavity; wherein the plug rod base 310 is used to move in the air pressure cavity according to the air pressure state of the air pressure cavity, to drive the plug rod body 320 and the sealing sheet 330 to move in the piston cavity, so that the sealing sheet 330 blocks the communication of the fluid through hole, or the fluid through hole is communicated through the piston through hole.

[0069] In this optional embodiment, referring to Figure 2 , the plug rod base 310 is arranged in the air pressure cavity near one end close to the bottom, the plug rod base 310 is the sealing end of the plug rod assembly 300, and the bottom surface of the plug rod base 310 is the bottom surface of the sealing end of the plug rod assembly 300. The buffer assembly 400 is arranged on the surface of the plug rod base 310, the plug rod body 320 is arranged on the upper side of the plug rod base 310 and connected to the upper side of the plug rod base 310, and the plug rod body 320 is a frame type limiting device, wherein the middle part has a fixed through cavity, and the fixed through cavity is in communication with the outside of the plug rod body 320 through the left and right sides.

[0070] The plug rod body 320 fixes the sealing sheet 330 in the fixed through cavity of the plug rod body 320, that is, the plug rod body 320 and the sealing sheet 330 constitute the piston end of the plug rod assembly 300. Among them, the left and right two sides of the sealing sheet 330 are in contact with the inner surface of the piston cavity of the on-off assembly 200, and the piston through hole in communication with the left and right sides is arranged on the sealing sheet 330.

[0071] It can be seen that the optional embodiment can also fix the sealing sheet 330 in the fixed through cavity of the plug rod body 320, so that the sealing sheet 330 will not be separated from the piston cavity when moving up and down in the piston cavity due to the limitation, so as to ensure the reliability of the on-off control structure in controlling the fluid on-off.

[0072] As Figure 2As shown, in one optional embodiment, the plug rod assembly 300 further comprises a resilient member 340. The resilient member 340 is arranged between the plug rod base 310 and the on-off assembly 200 in the air pressure cavity; wherein the air supply device is configured to change the air pressure state of the air pressure cavity by supplying air into the air pressure cavity, so as to drive the plug rod base 310 to compress the resilient member 340 in a direction away from the air inlet, and drive the plug rod body 320 and the sealing sheet 330 to move in a direction away from the air inlet, so that the sealing sheet 330 blocks the communication of the fluid passage; the resilient member 340 is configured to drive the plug rod base 310 to move towards the air inlet, so as to drive the plug rod body 320 and the sealing sheet 330 to move towards the air inlet, so that the fluid passage is communicated with the piston passage.

[0073] In this optional embodiment, referring to Figure 2 , the resilient member 340 is sleeved on the plug rod body 320, the lower end of the resilient member 340 is in contact with the upper side of the plug rod base 310, and the upper end of the resilient member 340 is in contact with the lower side of the on-off assembly 200.

[0074] When the air supply device supplies air into the air pressure cavity in the cylinder body 100 through the air inlet of the cylinder body 100, the plug rod base 310 is driven to move upward by the air pressure, so that the resilient member 340 is compressed upward by the plug rod base 310, and the plug rod body 320 and the sealing sheet 330 are driven to move upward in the piston cavity, so that the piston passage on the sealing sheet 330 is misaligned with the fluid passage of the on-off assembly 200, that is, the sealing sheet 330 blocks the communication between the left fluid passage and the right fluid passage of the fluid passage, and the sand powder fluid cannot flow through the fluid passage. After the air supply device stops supplying air into the air pressure cavity in the cylinder body 100, the resilient member 340 rebounds under the influence of the elastic potential energy after compression, so as to drive the plug rod base 310 to move downward, so that the piston passage on the sealing sheet 330 is aligned with the fluid passage of the on-off assembly 200, that is, the left fluid passage and the right fluid passage of the fluid passage are communicated through the piston passage of the sealing sheet 330, and at this time the sand powder fluid can flow through the fluid passage.

[0075] It can be seen that the optional embodiment can further control the movement of the plug rod base 310 in the air pressure cavity, the movement of the plug rod body 320 and the sealing sheet 330 in the piston cavity by the resilient member 340, so as to further improve the accuracy of the on-off control structure in controlling the fluid on-off.

[0076] As Figure 2As shown, in one optional embodiment, the on-off assembly 200 comprises an outer housing 210, a first sealing member 220 and a second sealing member 230. The outer housing 210 is arranged at one end of the air pressure cavity away from the air inlet, and the outer housing 210 is provided with a piston cavity in the radial direction of the air pressure cavity, and the outer housing 210 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; the first sealing member 220 is arranged on the first inner surface of the piston cavity, and the first sealing member 220 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; the second sealing member 230 is arranged on the second inner surface of the piston cavity, and the second sealing member 230 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; wherein 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 220 and the sealing surface of the second sealing member 230 are oppositely arranged, the opposite two side surfaces of the sealing sheet 330 are respectively in contact with the sealing surface of the first sealing member 220 and the sealing surface of the second sealing member 230, and the first through hole and the second through hole are oppositely arranged.

[0077] In this optional embodiment, referring to Figure 2 , the outer housing 210 has a vertically upward and downward piston cavity, and the upper end and the lower end of the piston cavity are communicated with the outside of the outer housing 210. The left and right inner walls of the outer housing 210 are respectively the first inner surface and the second inner surface of the piston cavity, that is, the first inner surface and the second inner surface of the piston cavity are two opposite inner surfaces of the piston cavity.

[0078] The first sealing member 220 is arranged on the first inner surface of the piston cavity, and the sealing surface of the first sealing member 220 is the right side surface of the first sealing member 220. The second sealing member 230 is arranged on the second inner surface of the piston cavity, and the sealing surface of the second sealing member 230 is the left side surface of the second sealing member 230. The first through hole of the first sealing member 220 and the second through hole of the second sealing member 230 are correspondingly arranged in the left and right transverse directions. The left side surface of the sealing sheet 330 is in contact with the sealing surface of the first sealing member 220, and the right side surface of the sealing sheet 330 is in contact with the sealing surface of the second sealing member 230.

[0079] When the piston through hole on the sealing sheet 330 is misaligned with the first through hole of the first sealing member 220 and the second through hole of the second sealing member 230, the sealing sheet 330 will block the communication between the first through hole and the second through hole, and the sand powder fluid cannot flow from the first through hole to the second through hole or from the second through hole to the first through hole. When the piston through hole on the sealing sheet 330 is aligned with the first through hole of the first sealing member 220 and the second through hole of the second sealing member 230, that is, the first through hole and the second through hole can realize communication through the piston through hole of the sealing sheet 330, and at this time the sand powder fluid can flow through the first through hole, the piston through hole and the second through hole.

[0080] As can be seen, this optional embodiment can also use the first seal 220 and the second seal 230 in combination with the sealing sheet 330 to seal the first seal 220 and the second seal 230 respectively when the sealing sheet 330 blocks the communication between the first through hole and the second through hole, thereby ensuring that the on / off control structure can accurately shut off the flow of sand powder fluid.

[0081] like Figure 2 As shown, in an optional embodiment, the buffer assembly 400 includes a first buffer 410 and a second buffer 420. The first buffer 410 is disposed on the surface of the piston rod base 310 facing the vent, and is used to buffer the impact of the piston rod base 310 on the cylinder body 100 when it moves in the pneumatic chamber; the second buffer 420 is disposed on the surface of the piston rod base 310 away from the vent, and is used to buffer the impact of the piston rod base 310 on the on / off assembly 200 when it moves in the pneumatic chamber.

[0082] In this optional embodiment, refer to Figure 2 The lower surface of the piston rod base 310 is provided with a first buffer 410. When the piston rod base 310 moves downward in the air pressure chamber and collides with the bottom of the air pressure chamber, the first buffer 410 can buffer the collision, thereby reducing the wear caused by the collision between the piston rod base 310 and the cylinder body 100, and reducing the noise generated after the collision. The upper surface of the piston rod base 310 is provided with a second buffer 420. When the piston rod base 310 moves upward in the air pressure chamber and collides with the bottom of the outer shell 210, the second buffer 420 can buffer the collision, thereby reducing the wear caused by the collision between the piston rod base 310 and the outer shell 210, and reducing the noise generated after the collision.

[0083] As can be seen, this optional embodiment can also reduce the wear caused by the collision between the piston rod base 310 and the cylinder body 100 and the outer shell 210 by setting the first buffer 410 on the surface of the piston rod base 310 facing the air port and the second buffer 420 on the surface of the piston rod base 310 away from the air port, thereby further extending the service life of the on / off control structure and reducing the noise generated when the on / off control structure is working.

[0084] like Figure 3As shown, in an optional embodiment, the buffer assembly 400 comprises a third buffer 430 and a fourth buffer 440. The third buffer 430 is arranged on the inner wall of the air chamber of the cylinder body 100 at the end close to the air inlet, and the third buffer 430 is used to buffer the collision of the cylinder body 100 when the plug rod base 310 moves in the air chamber; the fourth buffer 440 is arranged on the surface of the on-off assembly 200 on the side facing the air inlet, and the fourth buffer 440 is used to buffer the collision of the on-off assembly 200 when the plug rod base 310 moves in the air chamber.

[0085] In this optional embodiment, referring to Figure 3 , the inner wall of the bottom of the air chamber of the cylinder body 100 is provided with a third buffer 430, and when the plug rod base 310 collides with the bottom of the air chamber after moving downward in the air chamber, the third buffer 430 can buffer the collision, thereby reducing the damage caused by the collision between the plug rod base 310 and the cylinder body 100, and reducing the noise generated after the collision. The lower surface of the outer shell 210 is provided with a fourth buffer 440, and when the plug rod base 310 collides with the bottom of the outer shell 210 after moving upward in the air chamber, the fourth buffer 440 can buffer the collision, thereby reducing the damage caused by the collision between the plug rod base 310 and the outer shell 210, and reducing the noise generated after the collision.

[0086] As can be seen, this optional embodiment can also reduce the damage caused by the collision between the plug rod base 310 and the cylinder body 100 and the outer shell 210 by arranging the third buffer 430 on the inner wall of the air chamber of the cylinder body 100 at the end close to the air inlet and arranging the fourth buffer 440 on the surface of the on-off assembly 200 on the side facing the air inlet, thereby further prolonging the service life of the on-off control structure and reducing the noise generated when the on-off control structure is working.

[0087] It can be understood that the first buffer 410, the second buffer 420, the third buffer 430 and the fourth buffer 440 included in the buffer assembly 400 can be adaptively arranged according to the actual needs of collision buffering. For example, in a specific embodiment, as Figure 4 shown, the first buffer 410, the second buffer 420, the third buffer 430 and the fourth buffer 440 included in the buffer assembly 400 can be arranged at the same time, and each is arranged at the corresponding position described in the above optional embodiment. When arranged at the same time, the buffering effect can be further improved, thereby further reducing the damage caused by the collision.

[0088] In an optional embodiment, the first buffer 410, the second buffer 420, the third buffer 430 and the fourth buffer 440 are made of soft material, so as to further improve the buffering effect of the collision, thereby further reducing the damage caused by the collision between the plug rod base 310 and the cylinder body 100 and the outer shell 210.

[0089] As shown in Figure 2 an optional embodiment, the outer shell 210 comprises a first base 211 and a second base 212. The first base 211 has a third through hole, and the connecting side of the first base 211 is provided with a first piston groove. The third through hole is in communication with the first piston groove, and the first sealing member 220 is arranged on the inner surface of the first piston groove. The first through hole of the first sealing member 220 is arranged opposite to the third through hole of the first base 211. The second base 212 has a fourth through hole, and the connecting side of the second base 212 is provided with a second piston groove. The fourth through hole is in communication with the second piston groove, and the second sealing member 230 is arranged on the inner surface of the second piston groove. The second through hole of the second sealing member 230 is arranged opposite to the fourth through hole of the second base 212. The connecting side of the first base 211 is arranged opposite to the connecting side of the second base 212, and the connecting side of the first base 211 is connected to the connecting side of the second base 212, so as to form a piston cavity by the first piston groove and the second piston groove.

[0090] In this optional embodiment, referring to Figure 2 , the outer shell 210 can be divided into the first base 211 on the left half and the second base 212 on the right half. The connecting side of the first base 211 is located on the right side surface of the first base 211, and the connecting side of the first base 211 is provided with the first piston groove. The inner surface of the first piston groove is the first inner surface of the piston cavity, and the first sealing member 220 is arranged on the inner surface of the first piston groove. The connecting side of the second base 212 is located on the left side surface of the second base 212, and the connecting side of the second base 212 is provided with the second piston groove. The inner surface of the second piston groove is the second inner surface of the piston cavity, and the second sealing member 230 is arranged on the inner surface of the second piston groove.

[0091] The connecting side of the first base 211 is connected to the connecting side of the second base 212, so that the first piston groove of the first base 211 and the second piston groove of the second base 212 form the piston cavity, i.e. the plug rod body 320 and the sealing sheet 330 can move up and down in the first piston groove and the second piston groove.

[0092] Further, the first base 211 is further provided with the third through hole, and the third through hole of the first base 211 is arranged opposite to and in communication with the first through hole of the first sealing member 220. The second base 212 is further provided with the fourth through hole, and the fourth through hole of the second base 212 is arranged opposite to and in communication with the second through hole of the second sealing member 230.

[0093] It can be seen that the optional embodiment can further form a piston cavity by the first piston groove of the first base 211 and the second piston groove of the second base 212, so that the plug rod body 320 and the sealing sheet 330 can move in the first piston groove and the second piston groove.

[0094] As shown in the optional embodiment, the inner surface of the first piston groove of the first base 211 is provided with a first fixing groove, the third through hole is in communication with the first fixing groove, the first sealing member 220 is arranged in the first fixing groove, and the sealing surface of the first sealing member 220 is flush with the inner surface of the first piston groove; the inner surface of the second piston groove of the second base 212 is provided with a second fixing groove, the fourth through hole is in communication with the second fixing groove, the second sealing member 230 is arranged in the second fixing groove, and the sealing surface of the second sealing member 230 is flush with the inner surface of the second piston groove. Figure 2 In the optional embodiment, the inner surface of the first piston groove is provided with the first fixing groove, and the first sealing member 220 is arranged in the first fixing groove, so that the first fixing groove can fix the first sealing member 220. The inner surface of the second piston groove is provided with the second fixing groove, and the second sealing member 230 is arranged in the second fixing groove, so that the second fixing groove can fix the second sealing member 230.

[0095] Further, the sealing surface of the first sealing member 220 is flush with the inner surface of the first piston groove, and the sealing surface of the second sealing member 230 is flush with the inner surface of the second piston groove, so that the sealing sheet 330 can move up and down in the first piston groove and the second piston groove, and the first sealing member 220 can contact the sealing sheet 330 through the sealing surface thereof, and the second sealing member 230 can contact the sealing sheet 330 through the sealing surface thereof.

[0096] It can be seen that the optional embodiment can further fix the first sealing member 220 through the first fixing groove of the first base 211 and fix the second sealing member 230 through the second fixing groove of the second base 212, so that the first sealing member 220 and the second sealing member 230 will not be separated when moving up and down on the sealing sheet 330 due to the limiting, thereby further ensuring the reliability of the on-off control structure in controlling the fluid on-off.

[0097] As shown in the optional embodiment, the inner surface of the first piston groove of the first base 211 is provided with a first fixing groove, the third through hole is in communication with the first fixing groove, the first sealing member 220 is arranged in the first fixing groove, and the sealing surface of the first sealing member 220 is flush with the inner surface of the first piston groove; the inner surface of the second piston groove of the second base 212 is provided with a second fixing groove, the fourth through hole is in communication with the second fixing groove, the second sealing member 230 is arranged in the second fixing groove, and the sealing surface of the second sealing member 230 is flush with the inner surface of the second piston groove.

[0098] Figure 2 ​As shown, in an optional embodiment, the on-off control structure further comprises: a first flow joint 500 and a second flow joint 600. The first flow joint 500 is arranged at the third through hole of the first base 211, and the interface of the first flow joint 500 is in communication with the third through hole of the first base 211 and the first through hole of the first sealing member 220 respectively; the second flow joint 600 is arranged at the fourth through hole of the second base 212, and the interface of the second flow joint 600 is in communication with the fourth through hole of the second base 212 and the second through hole of the second sealing member 230 respectively.

[0099] In this optional embodiment, the first flow joint 500 is connected with the third through hole of the first base 211, so that the interface of the first flow joint 500 is in communication with the third through hole of the first base 211 and the first through hole of the first sealing member 220 respectively. The second flow joint 600 is connected with the fourth through hole of the second base 212, so that the interface of the second flow joint 600 is in communication with the fourth through hole of the second base 212 and the second through hole of the second sealing member 230 respectively. The first flow joint 500 and the second flow joint 600 can be connected with external fluid flow pipes, so that the sand powder fluid conveyed by the fluid flow pipes can be introduced into and discharged from the on-off control structure.

[0100] It can be seen that, in this optional embodiment, the sand blasting fluid which needs to be controlled to turn on and off can also be introduced into and discharged from the on-off control structure through the first flow joint 500 and the second flow joint 600, so that the sand blasting fluid can not overflow when being conveyed to the on-off control structure and discharged from the on-off control structure, thereby improving the stability of the sand blasting fluid conveying.

[0101] The utility model discloses still a kind of dental sand blasting equipment, it includes gas supply device, sand blasting flow pipe body and the on-off control structure described in the above 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 into air pressure cavity through air port;Sand blasting flow pipe body is in communication with the fluid through hole of on-off assembly 200.

[0102] In the embodiment, the sand blasting flow pipe body has a front section pipe body and a rear section pipe body, and the front section pipe body of the sand blasting flow pipe body is in communication with the third through hole of the first base 211 and the first through hole of the first sealing member 220 by being connected with the first flow joint 500, and the rear section pipe body is in communication with the fourth through hole of the second base 212 and the second through hole of the second sealing member 230 by being connected with the second flow joint 600.

[0103] The air supply device is connected with the air passage of the cylinder body 100, and the air supply device can control the up-and-down longitudinal movement of the sealing sheet 330 in the piston cavity formed by the first piston groove and the second piston groove by pressurizing the air pressure cavity of the cylinder body 100. The sandblasting guide pipe body can transport sandblasting fluid, when the piston through hole of the sealing sheet 330 is aligned with the first through hole and the second through hole, the first through hole and the second through hole can be communicated through the piston through hole, and the sandblasting fluid transported by the front pipe body can flow through the first through hole, the piston through hole and the second through hole, and then be transported to the rear pipe body; when the piston through hole of the sealing sheet 330 is not aligned with the first through hole and the second through hole, the non-through hole part of the sealing sheet 330 can block the communication between the first through hole and the second through hole, and the sandblasting fluid transported by the front pipe body cannot be transported to the rear pipe body.

[0104] It can be seen that, in the embodiment, the dental sandblasting equipment can adopt the on-off control structure, the buffer assembly 400 of the on-off control structure can buffer the collision of the sealing end of the plug rod assembly 300 with the cylinder body 100 and the on-off assembly 200 respectively, so that the wear of the components related to the on-off control structure can be reduced, the service life of the on-off control structure can be prolonged, and the noise generated during the operation of the on-off control structure can be reduced.

[0105] The technical means disclosed in the utility model scheme is not only limited to the technical means disclosed in the above-mentioned embodiments, but 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 principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered to be within the protection scope of the utility model.

Claims

1. An on / off control structure, characterized in that, The structure includes: The cylinder body has a pressure chamber and an air vent. The pressure chamber is connected to the air vent, and the air vent is connected to an external air supply device. The air supply device is used to supply air to the pressure chamber through the air vent to change the pressure state of the pressure chamber. A switching assembly is provided at one end of the pressure chamber away from the vent. The switching assembly has a piston cavity in the radial direction of the pressure chamber and a fluid through hole in the direction perpendicular to the radial direction of the piston cavity. The fluid through hole communicates with the piston cavity. A stopper rod assembly is disposed in the pneumatic chamber near the vent. The sealing end of the stopper rod assembly faces the vent, and the piston end of the stopper rod assembly is disposed away from the vent. The piston end of the stopper rod assembly has a piston through hole in the radial direction perpendicular to the pneumatic chamber. The sealing end of the stopper rod assembly is used to move in the pneumatic chamber according to the pneumatic pressure state, so as to drive the piston end of the stopper rod assembly to move in the piston cavity, so that the piston end of the stopper rod assembly blocks the communication of the fluid through hole, or allows the fluid through hole to communicate through the piston through hole. A buffer assembly is provided at the sealing end of the piston rod assembly, and / or at the end of the on / off assembly facing the vent and on the inner wall of the pneumatic chamber of the cylinder body near the vent. The buffer assembly is used to buffer the collision between the cylinder body and the on / off assembly when the sealing end of the piston rod assembly moves in the pneumatic chamber.

2. The on / off control structure according to claim 1, characterized in that, The piston rod assembly includes: A stopper rod base is disposed at one end of the air pressure chamber near the vent. The stopper rod base is the sealing end of the stopper rod assembly. The buffer assembly is disposed on the surface of the stopper rod base. The circumferential direction of the stopper rod base contacts the inner wall of the air pressure chamber to seal the air pressure chamber. A piston rod body is connected to the piston rod base on the side away from the vent. The piston rod body has a fixed cavity and is disposed in the piston cavity. A sealing sheet having a piston through hole is disposed in the fixed through cavity, and two opposite sides of the sealing sheet respectively contact the inner wall of the piston cavity; The piston rod base is used to move in the air pressure chamber according to the air pressure state of the air pressure chamber, so as to drive the piston rod body and the sealing plate to move in the piston cavity, so that the sealing plate blocks the connection of the fluid passage or allows the fluid passage to be connected through the piston passage.

3. The on / off control structure according to claim 2, characterized in that, The buffer component includes: A first buffer is disposed on the surface of the piston rod base facing the vent. The first buffer is used to buffer the collision of the piston rod base with the cylinder body when the piston rod base moves in the air pressure chamber. The second buffer is disposed on the surface of the piston rod base away from the vent, and is used to buffer the impact of the on / off assembly on the piston rod base when it moves in the air pressure chamber.

4. The on / off control structure according to claim 2, characterized in that, The buffer component includes: The third buffer is disposed on the inner wall of the air pressure chamber of the cylinder body near the air vent. The third buffer is used to buffer the collision of the cylinder body with the piston rod base when it moves in the air pressure chamber. A fourth buffer is disposed on the surface of the on / off assembly facing the vent, and the fourth buffer is used to buffer the impact of the on / off assembly on the piston rod base when it moves in the air pressure chamber.

5. The on / off control structure according to claim 2, characterized in that, The piston rod assembly also includes: A spring-loaded component is disposed between the piston rod base and the on / off assembly in the pneumatic chamber; The air supply device is used to change the air pressure state of the air pressure chamber by supplying air into the air pressure chamber, thereby driving the piston rod base to compress the rebound member in a direction away from the air vent, and pushing the piston rod body and the sealing plate in a direction away from the air vent, so that the sealing plate blocks the connection of the fluid passage; the rebound member is used to push the piston rod base towards the air vent, thereby driving the piston rod body and the sealing plate towards the air vent, so that the fluid passage is connected through the piston passage.

6. The on / off control structure according to any one of claims 2 to 5, characterized in that, The on / off component includes: The outer casing is disposed at one end of the air pressure chamber away from the air inlet. The outer casing has a piston cavity in the radial direction of the air pressure chamber and a fluid passage in the direction perpendicular to the radial direction of the air pressure chamber. The fluid passage communicates with the piston cavity. A first sealing element is disposed on a first inner surface of the piston cavity. The first sealing element has a first through hole in the radial direction perpendicular to the air pressure cavity, and the first through hole communicates with the piston cavity. The second sealing element is disposed on the second inner surface of the piston cavity, and the second sealing element has a second through hole in the radial direction perpendicular to the air pressure cavity, and the second through hole communicates with the piston cavity. Wherein, the first inner surface and the second inner surface are two inner surfaces opposite to the piston cavity, the sealing surfaces of the first seal and the second seal are arranged opposite to each other, the two opposite sides of the sealing sheet are in contact with the sealing surfaces of the first seal and the second seal respectively, and the first through hole and the second through hole are arranged opposite to each other.

7. The on / off control structure according to claim 6, characterized in that, The outer casing includes: A first base has a third through hole, and a first piston groove is provided on the connecting side of the first base. The third through hole communicates with the first piston groove. A first sealing member is disposed on the inner surface of the first piston groove, and the first through hole of the first sealing member is disposed opposite to the third through hole of the first base. The second base has a fourth through hole, and a second piston groove is provided on the connecting side of the second base. The fourth through hole communicates with the second piston groove. The second seal is disposed on the inner surface of the second piston groove, and the second through hole of the second seal is disposed opposite to the fourth through hole of the second base. The connecting side of the first base is disposed opposite to the connecting side of the second base, and the connecting side of the first base is connected to the connecting side of the second base, so that the first piston groove and the second piston groove form the piston cavity.

8. The on / off control structure according to claim 7, characterized in that, The inner surface of the first piston groove of the first base is provided with a first fixing groove, the third through hole communicates with the first fixing groove, the first sealing member is disposed 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 second base has a second fixing groove on the inner surface of the second piston groove. The fourth through hole communicates with the second fixing groove. The second sealing member is disposed 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.

9. The on / off control structure according to claim 8, characterized in that, The structure also includes: The first flow guide connector is disposed at the third through hole of the first base, and the interface of the first flow guide connector is connected to the third through hole of the first base and the first through hole of the first seal respectively. The second flow guide is disposed at the fourth through hole of the second base, and the interface of the second flow guide is connected to the fourth through hole of the second base and the second through hole of the first seal respectively.

10. A dental air polishing device, characterized in that, The device includes: The on / off control structure as described in any one of claims 1 to 9; An air supply device is connected to the air vent of the cylinder body, and the air supply device is used to supply air to the air pressure chamber through the air vent. The sandblasting guide pipe body is connected to the fluid through hole of the on / off assembly.

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